CN117166273B - Non-steam explosion type pure physical pulping method and pulping production line - Google Patents
Non-steam explosion type pure physical pulping method and pulping production line Download PDFInfo
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Abstract
The invention discloses a non-steam explosion type pure physical pulping method and a pulping production line, wherein the non-steam explosion type pure physical pulping method comprises the following steps: crushing, heating, pressure relief, beating, screening, pulping and dewatering, wherein the heating is to put the crushed fiber raw material into a heating unit for steam water-proof heating, then non-blasting pressure relief is carried out to obtain a three-element structure with glass transition, and then the three-element structure is dehydrated, beaten, screened and pulping to obtain pulp. The non-steam explosion type pure physical pulping method adopts mechanical pulping, does not need to add chemical agents, has higher yield, is safe in pulping process and low in cost, does not cause larger tearing damage to fibers in the pulping process, and greatly improves the physical strength of the finally obtained mechanical pulp.
Description
Technical Field
The invention relates to the technical field of pulping by utilizing fiber fabrics, in particular to a non-steam explosion type pure physical pulping method and a pulping production line.
Background
In the existing pulping technology, methods such as a chemical method, a chemical mechanical method, a mechanical method, biological pulping and the like exist, the main flow of industry and large-scale production can be mainly the first three, and chemical pulp, chemical mechanical pulp and mechanical pulp are respectively produced. The former two methods dissolve lignin in the fiber raw material by adding chemical agents and heating to obtain cellulose and hemicellulose, so that the strength is better but the yield is lower, and the pulping process adds the chemical agents, so that the produced waste liquid has great environmental pollution, and the waste liquid is treated, so that the chemical agent residues cannot be completely removed, and huge cost is also required. While the traditional mechanical pulping generally adopts a mode of extruding lignin through a thread rolling machine after mechanically crushing fiber raw materials, the yield is generally 95%, the mechanical pulping almost cannot dissolve lignin in the raw materials, the strength of a finished product is affected, and the physical strength is low due to the fact that the fiber is greatly damaged by friction and tearing in the production process.
In recent years, a steam explosion type mechanical pulping method is popular in the market because it does not require addition of chemical agents and has high pulping yield. In the steam explosion pulping process, after water molecules of external steam permeate into pores among fibers or water molecules in original plant cells are vaporized, the original three-element structure is destroyed in a microcosmic level through instantaneous steam explosion, lignin is removed as much as possible through a macroscopic physical separation technology, and cellulose and hemicellulose used for papermaking or other pulp finished products are separated. However, the steam explosion machine used for pulping by the steam explosion machine has high price and high input cost, and the steam explosion machine has higher requirements on equipment installation environment, and a large pit is required to be arranged to reduce noise and ensure safety, so the steam explosion machine has high requirements on site selection and is not suitable for popularization and application.
Disclosure of Invention
The invention aims to at least solve one of the technical problems in the prior art, and provides an environment-friendly and low-cost non-steam-explosion type pure physical pulping method which can reduce the tearing damage of fibers in the mechanical pulping process and effectively remove lignin in plant fibers.
The invention also provides a non-steam explosion type pure physical pulping production line, so as to improve pulping environment and reduce pulping cost.
According to an embodiment of the first aspect of the present invention, there is provided a non-steam exploded pure physical pulping method comprising:
crushing: carrying out physical crushing on the fiber raw material;
and a heating step: loading the crushed fiber raw material into a heating unit for water vapor water-proof heating, and carrying out heat preservation and pressure maintaining in the heating process, so that the lignin, hemicellulose and cellulose of the fiber raw material are permeated and cured by water vapor, and the lignin is vitrified to obtain a vitrified three-element structure;
decompression step: slowly discharging the water vapor in the heating unit, performing non-blasting pressure relief, and discharging the three-element structure after the pressure relief is completed;
beating: beating the three-element structure with glass transition to form fiber fine materials in strip, thread or velvet shape or any two or three of the fiber fine materials;
screening: screening the fiber fines to remove fine fragments or powder therefrom; the method comprises the steps of,
pulping, namely delivering the screened material into a pulping machine, and grinding the material into pulp;
according to the non-steam-explosion type pure physical pulping method of the embodiment of the first aspect of the present invention, after the pressure release step before the hammering step, the method further comprises: the glass-transition trisaccharide structure is dewatered and/or the fiber fines are dewatered after the beating step and before the sieving step.
According to the non-steam explosion type pure physical pulping method of the embodiment of the first aspect of the invention, the fiber raw material is sent into a plurality of heating units simultaneously or in a staggered mode, so that at least one heating unit directly discharges water vapor in the heating unit to the other heating unit when the pressure is relieved.
According to the non-steam explosion type pure physical pulping method of the embodiment of the first aspect of the invention, in the heating step, the heating unit carries out multistage pressure maintaining and/or stage heat preservation heating on the fiber raw material.
According to the non-steam explosion type pure physical pulping method of the embodiment of the first aspect of the invention, in the heating step, the heating temperature is between 99 ℃ and 222 ℃, the pressure of the pressure maintaining in the heating process is between 0.1 Mpa and 2.5Mpa, and the time of the pressure maintaining is between 10 minutes and 200 minutes.
According to the non-steam explosion type pure physical pulping method, in the pressure relief step, the pressure relief time is longer than 1 minute.
According to the non-steam-explosion type pure physical pulping method of the embodiment of the first aspect of the present invention, after the pressure release step before the hammering step, the method further comprises: and temporarily storing the three-element structure subjected to the glass transition under natural conditions, or blowing air to the three-element structure subjected to the glass transition through a fan during temporarily storing.
According to the non-steam explosion type pure physical pulping method of the embodiment of the first aspect of the invention, in the heating step, when the fiber raw material is subjected to steam water-proof heating, the fiber raw material is isolated from the bottom of the heating unit, so as to reduce the contact of the fiber raw material with condensed water generated in the production process.
According to the non-steam explosion type pure physical pulping method of the embodiment of the first aspect of the invention, in the heating step, when the fiber raw material is subjected to steam water-proof heating, condensed water is discharged from the bottom of the heating unit to reduce the contact of the fiber raw material with the condensed water.
According to a second aspect of the present invention there is provided a non-steam exploded pure physical pulping line comprising:
at least one heating unit comprising: the device comprises a containing cavity for containing fiber materials, a water vapor input port and a pressure relief port, wherein the water vapor input port and the pressure relief port are communicated with the containing cavity, and a non-steam explosion pressure relief valve is arranged on the pressure relief port;
the beating unit is arranged at the downstream of the heating unit and comprises a material storage cavity and a beating piece which is rotatably arranged in the material storage cavity and used for beating the heated fiber material;
the screening device is arranged at the downstream of the beating unit and is used for screening the materials beaten by the beating unit and removing fine fragments or powder; and
and the pulping device is arranged at the downstream of the screening device and is used for pulping the screened materials.
According to the pulping production line of the embodiment of the second aspect of the invention, the heating units are multiple, and the steam input port of at least one heating unit is connected to the pressure relief valve of at least another heating unit through a pipeline.
According to the pulping production line of the second aspect of the embodiment of the invention, the bottom of the heating unit is provided with a drain valve for draining condensed water.
According to a second aspect of the present invention, the pulping line further comprises at least one dewatering device for dewatering the heated material, at least one of said dewatering devices being arranged downstream of said heating unit and upstream of said beating unit and/or at least one of said dewatering devices being arranged downstream of said beating unit and upstream of said screening device.
The non-steam explosion type pure physical pulping method has at least the following beneficial effects: the fiber raw material is subjected to steam water-proof heating through the heating unit, pressure is maintained in the heating process, the fiber raw material is subjected to glass transition, non-blasting type slow pressure relief is performed, the three-element structure obtained after pressure relief is subjected to beating, drying and dehydration can be performed before beating or after beating, lignin is effectively removed through subsequent screening, and therefore high-quality slurry is prepared. Therefore, the non-steam explosion type pure physical pulping method adopts a pure physical process to pulp, does not need to add chemical agents, eliminates environmental pollution, reduces the cost of wastewater treatment, greatly reduces the equipment investment cost because the pulping method adopts a non-blasting mode to separate lignin, improves the safety of the pulping process, facilitates the site selection of a pulping production line, is easy to popularize and apply, and can effectively remove lignin in plant fibers and improve the strength of pulp finished products.
According to the pulping production line disclosed by the embodiment of the second aspect of the invention, pure physical pulping is adopted without adding chemical agents, so that the environmental pollution is avoided, the cost of wastewater treatment is reduced, meanwhile, the lignin is separated in a non-blasting manner, the equipment investment cost is greatly reduced, the safety of the pulping process is also improved, and the pulping production line is easy to address and easy to popularize and apply.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The invention is further described below with reference to the drawings and examples;
fig. 1 is a flow diagram of a first embodiment of the non-steam exploded pure physical pulping process of the present invention.
Fig. 2 is a flow chart of a second embodiment of the non-steam exploded pure physical pulping process of the present invention.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and to simplify the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, features defining "first", "second" may include one or more such features, either explicitly or implicitly. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
The invention provides a non-steam explosion type pure physical pulping method, and the pulp water obtained by the pulping method can be used as papermaking raw materials for producing corrugated paper, packaging paper or kraft paper, can also be used as the original sand products such as cat litter, and can also be used as filling raw materials for various pressing plates and the like.
Referring to fig. 1, the non-steam exploded pure physical pulping method of the first embodiment includes the steps of:
s100, crushing: the fiber raw materials are crushed physically to be crushed into approximately equal crushed aggregates, so that the materials are heated and pressurized uniformly in the heating unit, and the processing parameters are relatively stable and consistent. The particle size is not too large or too small, in particular the particle size may be 3cm to 6cm.
The fiber raw material may be any type of plant raw material, such as wood or bamboo, which is commonly used in pulping processes, and bamboo is used as an example in this embodiment.
S200, heating: and loading the crushed fiber raw material into a heating unit for water vapor water-proof heating, and carrying out heat preservation and pressure maintaining in the heating process, so that the lignin, hemicellulose and cellulose of the fiber raw material are permeated and cured by water vapor, and the lignin is vitrified to obtain a vitrified three-element structure.
In some embodiments, the heating unit may employ a heating tank, which is relatively inexpensive to produce and maintain. The heating tank can be filled with steam from the outside to realize heat preservation and pressure maintaining, and can also generate steam through the heating component of the heating tank to heat the fiber raw material in the heating unit.
In the heating process, the fiber raw material is heated by adopting water insulation, so that the fiber raw material is prevented from being immersed in water to be steamed and boiled to be hydrolyzed and influence the temperature conductivity, and further, the glass transition of the fiber raw material is prevented.
Preferably, when steam water-proof heating is performed, care should be taken to isolate the fiber raw material from the bottom of the heating unit (the bottom of the heating unit is specifically the tank bottom of the heating tank), so as to reduce contact between the fiber raw material and condensed water in the heating process, avoid that condensed water in the tank wets the material and reduces the temperature of the wetted part of the material, and further influence the consistency of the material.
Specifically, an isolation supporting structure such as a partition plate or a bracket can be adopted, and a fiber raw material or a charging bucket or a hopper for containing the fiber raw material is arranged on the isolation supporting structure and keeps a certain distance with the tank bottom of the heating tank.
In the heating process of the fiber raw material, heat preservation and pressure maintaining are needed to ensure that water vapor fully permeates lignin, hemicellulose and cellulose of the fiber raw material, so that a three-element structure formed by the lignin, the hemicellulose and the cellulose is cured, the brittleness of the fiber raw material is weakened, the lignin is softened, a three-element structure with glass transition is obtained, and preparation is provided for removing the lignin in the subsequent step.
Because the condensed water is liquid water, the highest temperature is 100 ℃, and the contact of the condensed water and the fiber raw material can influence the temperature rise of the fiber raw material, so that the temperature rise is difficult, and the pressure maintaining effect of the heating unit can be influenced. In order to ensure the heat preservation and pressure maintaining effects, when the fiber raw material is subjected to steam water-proof heating, the device further comprises a drainage step of draining condensed water from the bottom of the heating unit, so that the condensed water is timely drained, and the heat preservation and pressure maintaining effects of the heating unit are further improved.
The drainage step can be realized by arranging a drainage valve at the bottom of the heating unit, and when the condensed water is drained, the drainage valve is preferably opened when the condensed water floods the drainage valve, so that the influence of water vapor sprayed out through the drainage valve on the heat preservation and pressure maintaining effects of the heating unit is avoided. Specifically, a detector for detecting the liquid level of the condensed water can be arranged in the heating unit, and when the liquid level of the condensed water reaches a first preset liquid level, a drain valve is opened to drain the condensed water; when the liquid level of the condensed water is reduced to reach a second preset liquid level, the drain valve is closed, and the liquid level of the condensed water still passes through the drain valve, so that the water vapor is prevented from being sprayed out under the high pressure in the heating unit.
S300, decompression: slowly discharging the water vapor in the heating unit, and performing non-blasting pressure relief so as to discharge the three-element structure after the pressure relief is finished. In the step, the pressure release of the heating unit adopts a non-steam explosion slow pressure release mode, the pressure release process is mild, the cost of purchasing an expensive steam explosion machine is saved, the pulping cost is greatly reduced, meanwhile, the safety of the pulping process is improved, the skill requirement on operators is reduced, and the common technicians can get on hand through simple training, so that the pulping process is easy to popularize and apply and the labor cost is saved.
The slow pressure release is based on 'non-steam explosion', and the 'slow' requirement in the step is met as long as the pressure release process does not cause steam explosion. Specifically, the pressure release time may be greater than 1 minute.
S400, dehydration: the glass-transition trisaccharide structure is dehydrated.
The dehydration can be realized by natural air drying or natural airing, namely, the natural evaporation dehydration can be realized by arranging a material buffer unit, one or more fans for accelerating air circulation can be arranged at the buffer unit to accelerate the material dehydration, and drying equipment can be arranged at the buffer unit to realize rapid dehydration.
S500, beating: and beating the three-element structure with glass transition, and beating the three-element structure into fiber fine materials in a strip shape, a thread shape, a velvet shape or a combination of any two or three of the fiber fine materials.
A hammer, i.e. a tool with a certain weight is hit at a certain speed on a three-element structure with a glass transition. The direction of the beating is not limited, and the beating mode can be manual beating or machine beating.
The three-element structure which is changed into the shape of strip, thread, velvet or the combination of any two or three of the three is changed into the shape of strip, thread, velvet by beating, the lignin of the fibrous material in the state is basically destroyed, and is crushed into small fragments or powder, and the cellulose and hemicellulose are reserved due to stronger toughness.
S600, screening: the fine fiber materials obtained in the step S500 are screened to remove fine chips or powder therefrom.
In the fibrous fines obtained in S500, the fine chips or powder are mostly lignin and a small part are also fines, and these fine chips or powder are screened out by screening, thereby removing lignin as much as possible and retaining useful cellulose and hemicellulose. Of course, it is understood that the screening does not necessarily completely screen out lignin therein, and a small portion of lignin remains in the screened material, but the quality of the finished pulp product is not greatly affected due to the low ratio of the remaining lignin.
Specifically, the screening step can be realized by adopting a porous vibrating screen for one-time screening, and can also be realized by adopting a porous vibrating screen for multiple times for multi-stage screening.
S700, pulping: and (3) grinding the sieved material to form slurry. Pulping by a disc grinder to obtain slurry.
According to the non-steam explosion type pure physical pulping method, fiber raw materials are heated through steam in a water-proof mode, pressure is maintained in the heating process, the fiber raw materials are gradually softened, glass transition is achieved, non-explosion type slow pressure release is conducted, a three-element structure obtained after pressure release is beaten, drying and dehydration are conducted before or after beating, subsequent screening is facilitated, lignin is effectively removed, and therefore high-quality pulp is obtained. The pure physical pulping process does not need to add chemical agents, avoids environmental pollution, reduces the cost of wastewater treatment, simultaneously greatly reduces the equipment investment cost and improves the safety of the pulping process because the pulping method adopts a non-blasting mode to separate lignin, so that the site selection of a pulping production line is easy, the popularization and the application are easy, lignin in plant fibers can be effectively removed by the non-steam explosion type pure physical pulping method, and the strength of pulp finished products is improved.
The packaging paper such as corrugated paper, kraft paper and the like has relatively high requirement on strength, and waste paper or waste paper is generally adopted to be added into a long fiber board for production in the production process. The chemical pulp can be added to improve the strength of the product, but the production of the chemical pulp brings about environmental pollution, and the wastewater treatment cost is high, so that the overall production cost of the packaging paper such as corrugated paper, kraft paper and the like is increased. However, if conventional mechanical pulp (mechanical pulp obtained by conventional mechanical pulping other than steam explosion) is to be added, although the cost is lower than that of chemical pulp, the conventional mechanical pulp is generally used only as packing material of packaging paper because lignin is hardly removed, and the proportion is generally not higher than 15%, otherwise, the qualification rate of the product is affected. The non-steam explosion type pure physical pulping method of the embodiment is adopted for pulping, the cost is slightly higher than that of the traditional mechanical pulp, but the quality is far higher than that of the traditional mechanical pulp (approaching machine pulp) because lignin residues are less, so that the adding proportion of the pulp water prepared by the process of the embodiment can reach more than 30% when the packaging paper is produced, and meanwhile, the whole process has no chemical addition, is environment-friendly and nontoxic, has low equipment and fixed asset investment, high safety and obvious comprehensive cost advantage.
For pulping processes, the isolation of three elements in plants is the core process. In the traditional steam explosion pulping process, after high temperature and high pressure, water molecules of steam enter or water molecules in original plant cells are vaporized, the original three-element structure is destroyed in a microcosmic level through instantaneous steam explosion, and then cellulose and hemicellulose for papermaking are separated through a macroscopic physical separation technology. The instantaneous steam explosion is a rapid destruction process of plant three-element, and has high safety guarantee cost, equipment cost and personnel cost and large implementation difficulty although the efficiency is high. The non-steam explosion type pure physical pulping method of the embodiment adopts a large number of experiments to treat the plant fiber raw material by breaking the conventional high-temperature high-pressure separation process, and the method can be used for producing qualified paper products without steam explosion. Compared with the steam explosion process, the pulping process can perform high-temperature and high-pressure steam water-proof heating by adopting a common heating tank, and compared with the steam explosion machine, the cost is greatly reduced, and the price of one heating tank with 10 charging barrels or hoppers is only less than 1/5 of the price of the steam explosion machine. In some embodiments, in the heating step S200, the heating temperature is preferably between 99 degrees celsius and 222 degrees celsius, the pressure is between 0.1 Mpa and 2.5Mpa, and the dwell time is preferably between 10 and 200 minutes.
The temperature, pressure and dwell time were slightly different for the different fibre materials. The temperature and pressure of the pressure maintaining cannot be too low or too high, the effect of separating lignin, hemicellulose and cellulose cannot be achieved due to the fact that too low pressure is too high, and carbonization of the material is easy to occur. Likewise, the dwell time must not be too short or too long.
While dwell time is also related to temperature and pressure, 120 minutes when the temperature of the heated fiber feedstock in the heating unit is 125 degrees celsius and the pressure is 0.25 mpa. I.e. the lower the temperature, the lower the pressure and the longer the corresponding dwell time is required.
In some embodiments, in the heating step S200, the heating unit may heat the fiber raw material in a multi-stage step-by-step pressure maintaining and/or step-by-step heat preserving manner, so as to avoid carbonization of the fiber raw material caused by heat preservation and pressure maintaining in one step, affect the quality of the pulping finished product, and meanwhile, the pressure maintaining and heat preserving are performed in steps, which is also beneficial for water vapor to fully permeate the fiber raw material, so that the fiber raw material is mildly cured, and lignin is removed.
The multi-stage step-by-step pressure maintaining is that the pressure maintaining process is divided into a plurality of stages of step-by-step pressure maintaining, when the pressure reaches the pressure of the first stage, the pressure is maintained for a period of time, the pressure is continuously increased to the pressure of the second stage, the pressure is maintained for a period of time, and the like. The pressure maintaining stage number can be adaptively adjusted according to different fiber raw materials, different seasons and different environmental temperatures and humidity.
The multi-stage gradual heat preservation, namely the heat preservation process is divided into a plurality of stages of gradual heat preservation, when the temperature reaches the temperature of the first stage, the heat preservation is carried out for a period of time, the pressure continues to be increased to the temperature of the second stage, the heat preservation is carried out for a period of time, and the like. The heat preservation stage number can be adaptively adjusted according to different fiber raw materials, different seasons and different environmental temperatures. In some embodiments, in the heating step S200, the fiber raw material is fed into a plurality of heating units simultaneously or in a staggered manner, so that at least one heating unit directly discharges the water vapor therein to another heating unit during pressure release, thereby realizing cyclic utilization of the water vapor, improving heating efficiency, saving energy and reducing pulping cost.
In some embodiments, after the pressure release step S300 before the hammering step S500, the method further includes: and temporarily storing the three-element structure subjected to glass transition under natural conditions, or blowing air to the three-element structure subjected to glass transition through a fan during temporary storage.
The temporary storage stacking can be realized by arranging a buffer unit, the mixed materials in each heating unit are firstly conveyed to the buffer unit, and then the mixed materials are continuously conveyed to the beating station through the buffer unit for beating. The temporary storage stacking step can reduce the water content of the three-element structure on one hand, is convenient for the subsequent lignin removal, and can eliminate the problem of discontinuous production caused by different time between the heating step and the beating step on the other hand.
When temporarily stacked, the three-element structure with glass transition can be naturally air-dried and dehydrated under natural conditions, and the three-element structure can be dehydrated quickly by a fan, so that the water content requirement of beating can be met quickly.
Through setting up the buffer unit and carrying the compounding to beating station in succession, realize the continuous operation production of beating station, beat station improvement production efficiency. And through increasing the quantity of heating unit, set up a plurality of heating units, for example 10, a plurality of heating units work according to the production beat, and the compounding is carried to the buffer memory unit in succession, guarantees that the compounding has always been stored in the buffer memory unit. The tact time is set according to the amount and processing time of the obtained mixed material that can be processed in each heating unit, the beating amount per unit time of the beating station, and the like.
Specifically, the buffer unit may employ a buffer tank, and an inlet end and an outlet end of the buffer tank are provided with a conveying mechanism such as a conveying belt for conveying the mixed materials.
In some embodiments, one of the heating units provides the blend to the buffer unit, and at least one other heating unit is in the step of heating, pressurizing, maintaining pressure or completing the maintaining pressure of the fiber raw material; after all the mixed materials in any heating unit are conveyed to the buffer unit, the fiber raw materials are added into the heating unit again, and heating, pressurizing and pressure maintaining are carried out again; the heating station and the beating station work independently of each other. Therefore, the mixing materials for completing the primary separation are guaranteed to be always contained in the heating unit and are used for being conveyed to the caching unit, and the mixing materials are always contained in the caching unit.
Moreover, as the heating unit and the beating station are mutually independent, the working efficiency of the beating station and the subsequent process is not affected due to the longer dwell time of the heating unit.
Similarly, in some embodiments, for a single heating unit, the mix within the single heating unit is delivered to the buffer unit in batches on a tact basis. Thus, continuous production can be realized, and the production efficiency is improved.
Of course, it will be appreciated that a plurality of heating units may be provided and that the mix within each heating unit is delivered to the hammering station in batches.
Referring to fig. 2, the non-steam exploded type pure physical pulping method of the second embodiment is basically the same as the first embodiment described above, except that the dewatering step S400 and the beating step S500 are interchanged in order.
That is, in the first embodiment described above, the three-element structure having a glass transition is dehydrated, and then beaten and sieved to remove lignin, and in the second embodiment, the three-element structure having a glass transition is required to be beaten, and then dehydrated and sieved. Although the steps are different, the second embodiment can also effectively remove lignin and improve the quality of the pulping finished product.
In other embodiments, the dewatering step may also be provided separately before and after the beating step, i.e., after the heating step, the glass-transition three-element structure is dewatered for the first time, then beaten in alignment, and after the beating step, dewatered for the second time, and then sieved.
The implementation mode of separating two times for dehydration is beneficial to the different humidity conditions of the materials in the beating step and the screening step, so that on one hand, the beating and screening efficiency is improved, and on the other hand, lignin is removed more thoroughly, so that the quality of a pulping finished product is improved. Specifically, the three-element structure with glass transition has humidity reaching preset humidity, beating is performed, when the sieving step is performed, the fiber fine material is further dehumidified to make the humidity smaller than the preset humidity, and then the sieving step is performed.
In other embodiments of the non-steam-explosion type pure physical pulping method, the above-mentioned dehydration step S400 may be omitted, and although the lignin removal ratio of the pulping method omitted by the dehydration step is slightly reduced compared with the pulping method with the dehydration step, compared with the traditional mechanical pulping, the lignin removal ratio and the retention ratio of cellulose are both greatly improved, so that the quality requirements of pulping finished products such as corrugated paper, kraft paper or cat litter can be satisfied.
The embodiment of the invention also provides a non-steam explosion type pure physical pulping production line, which comprises a heating unit beating unit, a screening device and a pulping device which are sequentially arranged from upstream to downstream.
The heating unit is used for heating the fiber raw material by water vapor in a water-proof way and maintaining pressure in the heating process, so that the water vapor permeates and cures lignin, hemicellulose and cellulose of the fiber raw material to obtain a three-element structure with glass transition.
The heating unit can adopt the mode of outside lets in vapor to realize heating pressurize, and it includes: the device comprises an accommodating cavity for accommodating fiber materials, a water vapor input port and a pressure relief port, wherein the water vapor input port and the pressure relief port are communicated with the accommodating cavity, and a non-steam explosion type pressure relief valve is arranged on the pressure relief port.
The bottom of the accommodating cavity of the heating unit can be provided with an isolating and supporting structure such as a baffle plate or a bracket to ensure that the fiber material is contacted with condensed water at the bottom of the accommodating cavity.
Preferably, the heating units are multiple, and the steam input port of at least one heating unit is connected to the pressure release valve of at least another heating unit through a pipeline, so that the pressure release of the steam of one heating unit is realized and the steam is discharged into the other heating unit, and the energy recycling is realized.
The bottom of the heating unit can be provided with a drain valve for draining condensed water, so that the condensed water in the heating unit can be drained in time, and the heating unit can be rapidly heated and boosted.
The beating unit is arranged at the downstream of the heating unit, the buffer unit continuously conveys the mixed materials to the beating unit, and the beating unit beats the mixed materials to enable lignin therein to form fragments or powder.
The beating unit comprises a material storage cavity for storing materials and a beating piece rotatably arranged in the material storage cavity and used for beating the heated fiber materials. The beating part can be arranged on one or more than one rotating shaft, so that the rotating shaft is driven to rotate by a driving part such as a motor to realize the rotation of the beating part, and accordingly fiber materials in the material storage cavity are beaten in the rotation process.
The screening device is arranged at the downstream of the hammering unit and screens the materials after the hammering unit hammers wires, and fine fragments or powder in the materials are screened out. Specifically, the screening device can adopt at least one mode of a multi-stage vibrating screen, water washing water spraying or air blowing.
The pulping device is arranged at the downstream of the screening device and is used for pulping the screened materials.
Preferably, the non-steam-exploded pure physical pulping line of the present embodiment may further include at least one dewatering device for dewatering the heated material, the at least one dewatering device being disposed downstream of the heating unit and upstream of the beating unit, and/or the at least one dewatering device being disposed downstream of the beating unit and upstream of the sieving device.
In the pulping production line of the embodiment, the heating unit is used for carrying out water vapor water-proof heating and pressurizing on the fiber raw material, and pressure maintaining is carried out in the heating process, so that a three-element structure with glass transition is obtained, and then the pulp slurry can be obtained through post-treatment by the post-beating unit, the screening device and the pulping device. The pulping production line adopts mechanical pulping, does not need to add chemical agents, has higher yield, and simultaneously, the heating unit adopts steam for heating the fiber raw materials in a water-proof way, so that the fiber raw materials can be fully permeated and cured, the toughness of the fibers is enhanced, the fibers cannot be greatly torn and damaged in the subsequent beating step, and the physical strength of the finally obtained mechanical pulp is greatly improved.
In some of these embodiments, at least one bucket or hopper is provided within the heating unit. Each charging bucket or hopper is used for containing a batch of fiber raw materials, the fiber raw materials are heated, pressurized and pressurized to form a three-element structure in glass transition, and the three-element structure in the heating unit is transported to the buffer storage unit in batches according to the production beats by taking the charging bucket or hopper as a unit.
By providing a plurality of heating units and/or a plurality of buckets (or hoppers) continuous production can be achieved, thereby improving production efficiency.
In some embodiments, a material delivery mechanism may be disposed within the heating unit for rapidly delivering the internal material into the buffer unit.
Other constructions and operations of non-steam exploded pure physical pulping processes and pulping lines according to embodiments of the present invention are known to those of ordinary skill in the art and will not be described in detail herein.
In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the invention, the scope of which is defined by the claims and their equivalents.
Claims (13)
1. A non-steam exploded pure physical pulping process comprising:
crushing: carrying out physical crushing on the fiber raw material;
and a heating step: loading the crushed fiber raw material into a heating unit for water vapor water-proof heating, and maintaining pressure in the heating process to enable the water vapor to permeate and cure lignin, hemicellulose and cellulose of the fiber raw material, and vitrifying the lignin to obtain a vitrified three-element structure;
decompression step: slowly discharging the water vapor in the heating unit, performing non-blasting pressure relief, and discharging the three-element structure after the pressure relief is completed;
beating: beating the three-element structure with glass transition to form fiber fine materials in strip, thread or velvet shape or any two or three of the fiber fine materials;
screening: screening the fiber fines to remove fine fragments or powder therefrom; the method comprises the steps of,
and (3) pulping: and (3) pulping the sieved material, and grinding into slurry.
2. The non-steam exploded pure physical pulping process according to claim 1, wherein: after the pressure release step before the beating step, the method further comprises the following steps: the glass-transition trisaccharide structure is dewatered and/or the fiber fines are dewatered after the beating step and before the sieving step.
3. The non-steam exploded pure physical pulping process according to claim 1, wherein: in the heating step, the fiber raw material is sent into a plurality of heating units simultaneously or in a staggered mode, so that at least one heating unit directly discharges water vapor in the heating unit to the other heating unit when the pressure is relieved.
4. The non-steam exploded pure physical pulping process according to claim 1, wherein: in the heating step, the heating unit carries out multistage gradual pressure maintaining and/or gradual heat preservation heating on the fiber raw material.
5. The non-steam exploded pure physical pulping process according to claim 1, wherein: in the heating step, the heating temperature is between 99 ℃ and 222 ℃, the pressure of the pressure maintaining during the heating process is between 0.1 Mpa and 2.5Mpa, and the time of the pressure maintaining is between 10 minutes and 200 minutes.
6. The non-steam exploded pure physical pulping process according to claim 1, wherein: in the pressure relief step, the pressure relief time is longer than 1 minute.
7. The non-steam exploded pure physical pulping process according to claim 1, wherein: after the pressure release step before the beating step, the method further comprises the following steps: and temporarily storing the three-element structure subjected to the glass transition under natural conditions, or blowing air to the three-element structure subjected to the glass transition through a fan during temporarily storing.
8. The non-steam exploded pure physical pulping process according to any of claims 1 to 7, characterized in that: in the heating step, when the fiber raw material is subjected to steam water-proof heating, the fiber raw material is isolated from the bottom of the heating unit, so that the contact between the fiber raw material and condensed water generated in the production process is reduced.
9. The non-steam exploded pure physical pulping process according to claim 8, wherein: when the fiber raw material is heated by steam in a water-proof way, the method further comprises the following steps: and a drainage step of draining condensed water from the bottom of the heating unit.
10. A non-steam exploded pure physical pulping line, comprising:
at least one heating unit comprising: the device comprises a containing cavity for containing fiber materials, a water vapor input port and a pressure relief port, wherein the water vapor input port and the pressure relief port are communicated with the containing cavity, and a non-steam explosion pressure relief valve is arranged on the pressure relief port;
the beating unit is arranged at the downstream of the heating unit and comprises a material storage cavity and a beating piece which is rotatably arranged in the material storage cavity and used for beating the heated fiber material;
the screening device is arranged at the downstream of the beating unit and is used for screening the materials beaten by the beating unit and removing fine fragments or powder; and
and the pulping device is arranged at the downstream of the screening device and is used for pulping the screened materials.
11. The non-steam exploded pure physical pulping line of claim 10, wherein: the heating units are multiple, and the steam input port of at least one heating unit is connected to the pressure release valve of at least one other heating unit through a pipeline.
12. The non-steam exploded pure physical pulping line of claim 10, wherein: the bottom of the heating unit is provided with a drain valve for draining condensed water.
13. The non-steam exploded pure physical pulping line of any of claims 10 to 12, characterized in that: the non-steam explosion type pure physical pulping production line further comprises at least one dehydration device for dehydrating the heated material, wherein at least one dehydration device is arranged at the downstream of the heating unit and is positioned at the upstream of the beating unit, and/or at least one dehydration device is arranged at the downstream of the beating unit and is positioned at the upstream of the screening device.
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Effective date of registration: 20240523 Address after: 433300 Gongcun Village, Bailuo Town, Jianli County, Jingzhou City, Hubei Province Patentee after: Hubei CIMC Superfiber Technology Co.,Ltd. Country or region after: China Patentee after: CIMC Container (Group) Co.,Ltd. Address before: 5th Floor, Building 9, Zhongji Zhigu Industrial Park, No.1 Nanshan Road, Songshan Lake High tech Industrial Development Zone, Dongguan City, Guangdong Province, 523000 Patentee before: CIMC Container (Group) Co.,Ltd. Country or region before: China |