CN114433250A - Slurry recovery device, slurry preparation system, and slurry recovery method - Google Patents

Abstract

The invention relates to the technical field of catalyst preparation, and discloses a slurry recovery device, a slurry preparation system and a slurry recovery method. This thick liquids recovery unit can heat the thick liquids that the concentration received to can carry out recycle to the thick liquids that produce when washing the slurrying cauldron. Through set up above-mentioned thick liquids recovery unit in thick liquids preparation system to can carry out recycle to the thick liquids that produce when washing the slurrying cauldron, reduce the waste of material, and avoid the pollution to ecological environment. The slurry recovery method comprises the following steps: step S10: collecting the slurry; step S20: heating the slurry collected in the step S10 to obtain steam and a steamed material.

Description

Slurry recovery device, slurry preparation system, and slurry recovery method

technical field

The invention relates to the technical field of catalyst preparation, in particular to a slurry recovery device, a slurry preparation system and a slurry recovery method.

Background technique

Taking the preparation of catalysts as an example, catalysts are the core of the chemical industry, and the high-quality preparation of catalysts is of great significance. Generally speaking, the preparation process of catalyst can be divided into three steps: raw material pretreatment, active component loading and catalyst activation. Among them, the raw material pretreatment and active component loading are basically carried out in the pulping kettle, that is, the catalyst raw materials and solvents such as water are fully mixed under certain conditions to form the active component slurry, and then the catalyst active components are loaded on the carrier. Thus, the loading of the active ingredient is completed.

In actual production, due to the variety of catalyst raw materials, in order to obtain a better loading effect, the active component slurry is often required to have a higher viscosity. Due to the high viscosity of the active component slurry, after the active component is loaded, there is often a lot of slurry attached to the inner wall of the pulping kettle, so it needs to be washed with a high-pressure water gun, and the slurry generated after washing is generally treated as wastewater. deal with.

However, since these slurries will contain catalyst raw materials, if they are directly discharged as wastewater, it will cause great waste and cause pollution to the ecological environment.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a slurry recovery device capable of heating and concentrating the received slurry, so as to be able to recycle the slurry generated when the pulping tank is flushed.

In order to achieve the above object, one aspect of the present invention provides a slurry recovery device, the slurry recovery device comprising:

a receiving unit configured to receive and discharge the slurry; and

An evaporation unit is arranged downstream of the receiving unit and is arranged to receive the slurry discharged from the receiving unit and heat the slurry to obtain steam and steam.

In the above technical solution, by arranging an evaporation unit capable of heating the slurry in the slurry recovery device, the slurry with a lower concentration can be concentrated to obtain a steaming material with a higher concentration. In this way, the steaming material with a higher concentration can be used again as The raw materials are put into the pulping kettle for preparing the slurry of the related products, thereby recycling the waste materials and reducing the waste of materials.

Preferably, the evaporation unit includes an evaporation tank, and an evaporation chamber capable of accommodating the slurry is provided in the evaporation tank, and the evaporation unit further includes a heating portion capable of heating the slurry in the evaporation chamber ,in:

The evaporation tank is provided with an evaporation inlet for the slurry to enter the evaporation chamber, a steam outlet for the steam generated after heating the slurry to discharge, and a steam outlet for the steam generated after heating the slurry to discharge. Outlet.

Preferably, the evaporation tank is provided with a circulation inlet and a circulation outlet for the slurry to enter and exit respectively;

The heating part includes a first heat exchanger, and the first heat exchanger has a first heating inlet and a first heating outlet for entering and exiting the first medium to be heated, and a first heating outlet that can be exchanged with the first medium to be heated, respectively. A first cooling inlet and a first cooling outlet into and out of the hot first heat exchange medium; wherein:

The first heating inlet is communicated with the circulation outlet, the first heating outlet is communicated with the circulation inlet, and the first cooling inlet is communicated with the steam outlet.

Preferably, the heating part includes a second heat exchanger, and the second heat exchanger has a second heating inlet and a second heating outlet for the second medium to be heated in and out, and a second heating inlet and a second heating outlet respectively for the second medium to be heated. The second cooling inlet and the second cooling outlet of the second heat exchange medium in and out of the medium heat exchange; wherein:

The second heating inlet receives the slurry discharged from the receiving unit, the second heating outlet communicates with the evaporation inlet, and the second cooling inlet communicates with the first cooling outlet.

Preferably, the slurry recovery device includes:

A collection tank, which is provided with a collection chamber capable of accommodating condensate, and the collection tank is provided with a collection tank inlet that can communicate with the second cooling outlet and a collection tank for the collected condensate to be discharged tank outlet; and

A first filter, which can receive the condensate discharged from the outlet of the collection tank and can filter out solid particles with a preset particle size in the condensate.

Preferably, the evaporation unit includes a gas-liquid separator, the gas-liquid separator receives the steam discharged from the steam outlet and performs gas-liquid separation on the steam, and the gas-liquid separator has a supply for the steam The inlet of the incoming separator, the steam outlet for the steam obtained after the gas-liquid separation is discharged, and the liquid outlet for the liquid discharged after the gas-liquid separation; wherein:

The separator inlet is communicated with the steam outlet, and the first cooling inlet is communicated with the steam outlet through the steam discharge port.

Preferably, the evaporation unit includes a first communication pipe that communicates the first cooling inlet and the vapor discharge port, and a compressor disposed in the first communication pipe, the compressor being capable of compressing the first communication the steam in the tube; and/or

The evaporation unit includes a second communication pipe that communicates the first heating inlet and the circulation outlet, and a first delivery pump arranged in the second communication pipe, and the first delivery pump can pump the second Connect the slurry in the pipe.

Preferably, the slurry recovery device includes a cyclone separator, which can receive the steam material discharged from the discharge port and perform solid-liquid separation on the steam material.

Preferably, the cyclone separator has a slurry outlet for discharging the secondary slurry obtained after solid-liquid separation;

The slurry recovery device includes a slurry processing unit including a disperser capable of receiving the secondary slurry discharged from the slurry outlet and dispersing the secondary slurry processing; or

The slurry processing unit includes a disperser and a second filter disposed downstream of the disperser, wherein: the disperser is capable of receiving the secondary slurry discharged from the slurry outlet and distributing the secondary slurry to the secondary slurry. The material is dispersed, and the second filter can filter out the solid particles with a preset particle size in the secondary slurry discharged from the disperser.

A second aspect of the present invention provides a slurry preparation system, the slurry preparation system includes a pulping kettle and a slurry recovery device provided by the present invention, the slurry recovery device is arranged downstream of the pulping kettle and The pulp discharged from the pulping kettle can be received. By arranging the slurry recovery device provided by the present invention in the slurry preparation system, the slurry generated when the pulping kettle is flushed can be recovered and utilized, the utilization rate of materials is improved, the waste of materials is greatly reduced, and the avoidance of It avoids the pollution of the direct discharge materials to the ecological environment.

A third aspect of the present invention provides a slurry recovery method, the slurry recovery method comprising the following steps:

Step S10: collecting slurry;

Step S20: Heating the slurry collected in the step S10 to obtain steam and steaming material.

Preferably, in the step S20, the heating temperature is 80°C-95°C; or

The slurry collected in the step S10 is gradually heated.

Preferably, the slurry recovery method includes the following steps: step S40: cooling the steam to obtain a condensate; preferably, in the step S40, gradually cooling the steam to obtain a condensate.

Preferably, the volume of the condensate obtained by cooling the steam is V ₂ , and the volume of the slurry collected in the step S10 is V ₁ , wherein: when V ₂ /V ₁ ≥ 0.95, the step S20 is discharged. steam obtained from.

Description of drawings

1 is a schematic diagram of the overall structure of a slurry preparation system according to a preferred embodiment of the present invention, wherein a slurry recovery device according to a preferred embodiment of the present invention is provided.

Description of reference numerals

12-receiving unit; 120-receiving tank; 14-evaporating unit; 140-evaporating tank; 144-evaporating chamber; 150-gas-liquid separator; 152-first heat exchanger; 153a-first communication pipe; 153b- 154-compressor; 155a-first delivery pump; 155b-second delivery pump; 155c-third delivery pump; 155d-fourth delivery pump; 155e-fifth delivery pump; 155f-sixth delivery 155g-seventh delivery pump; 155h-eighth delivery pump; 16-second heat exchanger; 18a-collection tank; 18b-first filter; 19a-cyclone; 19b-secondary slurry collection Tank; 19c - Disperser; 19d - Second Filter; 20 - Slurry Preparation System; 22 - Pulp Kettle; 24 - Nozzle.

Detailed ways

In the present invention, unless otherwise stated, the use of orientation words such as "up, down, left and right" generally refers to the understanding in conjunction with the orientation shown in the accompanying drawings and practical applications, and "inside and outside" are Refers to the inside and outside of the outline of the part.

The present invention provides a slurry recovery device, as shown in FIG. 1 , the slurry recovery device includes a receiving unit 12, and the receiving unit 12 is configured to receive and discharge the slurry, wherein the receiving unit 12 may include a receiving tank 120, the receiving tank 120 is provided with a receiving chamber capable of accommodating the slurry, and the receiving tank 120 is provided with a receiving tank inlet and a receiving tank outlet for feeding the slurry into and out of the receiving chamber respectively. The tank outlet discharges the slurry; the slurry recovery device further includes an evaporation unit 14 arranged downstream of the receiving unit 12, and the evaporation unit 14 is arranged to receive the slurry discharged by the receiving unit 12 and process the slurry Heating to obtain steam and steam, the receiving tank 120 discharges the slurry into the evaporation unit 14, and the evaporation unit 14 heats the slurry to obtain steam such as steam and steam, it should be noted that the solid content contained in the steam It is the same as the solid content contained in the slurry, but the concentration of the steam is larger than that of the slurry. By arranging the evaporation unit 14 capable of heating the slurry in the slurry recovery device, the slurry with a lower concentration can be concentrated to obtain a steam material with a higher concentration. In this way, the steam material with a higher concentration can be input into the In the pulping kettle 22 for preparing the slurry of related products, the waste materials are recycled and the waste of materials is reduced. It should also be pointed out that the slurry is the slurry produced after flushing the pulping kettle 22. Therefore, the concentration of the slurry is lower than that of the raw material, but the solid content contained in the slurry is the same as the solid content contained in the raw material. The concentration of the steam obtained after the evaporation of the slurry is similar to that of the raw material.

The slurry recovery device is especially suitable for the recovery and utilization of the catalyst slurry. For example, after the catalyst slurry is prepared in the pulping kettle 22, it can be discharged from the pulping kettle 22. The nozzle 24 rinses the catalyst slurry remaining on the inner wall of the pulping kettle 22 to form a slurry, the slurry has a low concentration, and the slurry can be discharged into the receiving tank 120 for collection, and then the collected slurry can be discharged. into the evaporation unit 14 for heating and concentration.

As shown in FIG. 1 , the evaporation unit 14 may include an evaporation tank 140 in which an evaporation chamber 144 capable of accommodating the slurry may be disposed, and the evaporation unit 14 may further include an evaporation chamber 144 capable of heating the slurry in the evaporation chamber 144 For the heating part, the structural form of the heating part is not particularly limited, as long as it can heat the slurry in the evaporation chamber 144 . In addition, the evaporation tank 140 may be provided with an evaporation inlet for entering the slurry into the evaporation chamber 144 , a steam outlet for discharging the steam generated after heating the slurry, and a material outlet for discharging the steam generated after heating the slurry. Wherein, the evaporation inlet may be arranged on the side wall of the evaporation tank 140 , and the steam outlet may be arranged at the top wall of the evaporation tank 140 .

The evaporation tank 140 can be provided with a circulation inlet and a circulation outlet for the slurry to enter and exit respectively, and both the circulation inlet and the circulation outlet can be arranged on the side wall of the evaporation tank 140, wherein the circulation inlet can be located above the circulation outlet, it can be understood that Yes, the slurry entering the evaporation chamber 144 from the evaporation inlet can be discharged through the circulation outlet, and after heating, it enters the evaporation chamber 144 through the circulation inlet; the heating part can include a first heat exchanger 152, the first heat exchanger The heater 152 has a first heating inlet and a first heating outlet for entering and exiting the first medium to be heated, respectively, and a first cooling inlet and a first cooling outlet for entering and exiting a first heat exchange medium capable of exchanging heat with the first medium to be heated, respectively. The outlet; wherein: the first heating inlet is communicated with the circulation outlet, the first heating outlet is communicated with the circulation inlet, and the first cooling inlet is communicated with the steam outlet. Therefore, the steam obtained by heating in the evaporation unit 14 can be used as the first heat exchange medium to heat the first medium to be heated, namely the slurry. It can be understood that the steam obtained by heating in the evaporation unit 14 can be used as the first heat exchange medium medium, and the steam obtained by heating in the evaporation unit 14 can be used as the first medium to be heated. As a result, the energy of each substance is fully utilized without excessive extra heat as a heat source. A temperature sensor can be set in the evaporation tank 140. When the temperature sensor detects that the temperature in the evaporation tank 140 is greater than 90°C, the slurry can be cut off in the evaporation tank 140 and is no longer affected by the first heat exchanger 152. heating.

In addition, the heating part may include a second heat exchanger 16, and the second heat exchanger 16 has a second heating inlet and a second heating outlet for the second medium to be heated in and out, and a second heat exchanger 16 for heat exchange with the second medium to be heated, respectively. The second cooling inlet and the second cooling outlet through which the second heat exchange medium enters and exits; wherein: the second heating inlet receives the slurry discharged from the receiving unit 12, the second heating outlet is communicated with the evaporation inlet, and the second cooling inlet is connected to the first The cooling outlet is connected, and the steam discharged from the first heat exchanger 152 can be used as the second heat exchange medium to preheat the slurry discharged from the receiving unit 12, that is, the slurry discharged from the receiving unit 12 can be used as the second heat exchange medium. heating medium. In this way, the steam generated by evaporating the slurry in the evaporation unit 14 can be used to cool down once in the first heat exchanger 152 and then passed into the second heat exchanger 16 to preheat the slurry before entering the evaporation unit 14 Therefore, not only can the slurry be rapidly heated to a preset temperature such as 90° C. or more in the evaporation unit 14 , but also the thermal energy of the steam can be fully utilized, thereby reducing energy waste.

The slurry recovery device may include a collection tank 18a, the collection tank 18a is provided with a collection chamber capable of accommodating condensate, and the collection tank 18a is provided with a collection tank inlet that can communicate with the second cooling outlet and the condensate for collection From the outlet of the collection tank discharged, it can be understood that the steam passes through the second heat exchanger 16 for secondary cooling to form condensate, and the condensate is discharged from the second cooling outlet and collected by the collection tank 18a. It should be noted that the steam is cooled to below 50° C. for the second time, and becomes a condensate, and the condensate is collected by the collecting tank 18a.

Additionally, a first filter 18b may be provided downstream of the collection tank 18a. The first filter 18b can receive the condensate discharged from the outlet of the collection tank and can filter out solid particles with a preset particle size in the condensate. It is understood that the first filter 18b can filter out the condensate. Solid particles with preset particle diameters in the liquid are obtained, thereby obtaining purified condensate. A fifth conveying pump 155e can be provided, and the fifth conveying pump 155e can pump the condensate discharged from the first filter 18b to the pulping kettle 22. The nozzle 24 in the pulping kettle 22 flushes the inner wall of the pulping kettle 22 to remove residues, thereby eliminating the need for additional solvent such as water for flushing, reducing waste of resources. In addition, a sixth delivery pump 155f can be provided, and the sixth delivery pump 155f can pump the condensate collected in the collection tank 18a into the first filter 18b, so as to improve the delivery efficiency of the condensate.

In order to facilitate the delivery of the slurry in the receiving unit 12, such as the receiving tank 120, to the second heat exchanger 16, a second delivery pump 155b can be provided, and the second delivery pump 155b can pump the slurry in the receiving tank 120 to the second heat exchanger 16. in the second heat exchanger 16 .

In addition, a gas-liquid separator 150 can be provided, and the gas-liquid separator 150 receives the steam discharged from the steam outlet and performs gas-liquid separation on the steam to remove the liquid carried in the steam. It can be understood that the gas-liquid separator 150 It has a separator inlet for entering the steam, a steam outlet for discharging the steam obtained after gas-liquid separation, and a liquid outlet for discharging the liquid obtained after gas-liquid separation. The steam outlet can be arranged on the top of the gas-liquid separator 150 , the liquid discharge port can be set at the bottom of the gas-liquid separator 150. It should be noted that a liquid return port that is connected to the liquid discharge port can be set on the evaporation tank 140, that is, the liquid obtained after gas-liquid separation can be Return to the evaporation tank 140 through the liquid return port, wherein: the inlet of the separator is communicated with the steam outlet, and the first cooling inlet can be communicated with the steam outlet through the steam discharge port. That is to say, the steam discharged from the evaporation tank 140 first passes through the gas-liquid separator 150 for gas-liquid separation, and then enters the first heat exchanger 152 for heat exchange and cooling.

A first communication pipe 153a that communicates with the first cooling inlet and the steam discharge port and a compressor 154 provided in the first communication pipe 153a may be provided, and the compressor 154 can compress the steam in the first communication pipe 153a, whereby the compressor 154 The steam can be compressed and heated up before entering the first heat exchanger 152 , for example, the steam can be heated to above 95° C., thereby enabling the steam to exchange heat with the slurry better.

The evaporation unit 14 may include a second communication pipe 153b connecting the first heating inlet and the circulation outlet, and a first delivery pump 155a arranged in the second communication pipe 153b, the first delivery pump 155a can pump the slurry in the second communication pipe 153b Therefore, the slurry can be pumped into the first heat exchanger 152 in time for heating, thereby improving the working efficiency.

A cyclone separator 19a can be provided, which can receive the steaming material discharged from the discharge port and perform solid-liquid separation on the steaming material. By setting the cyclone separator 19a at the slurry outlet, the steam obtained by evaporation can be concentrated again to increase the solid content of the secondary slurry. In addition, the cyclone separator 19a has a secondary liquid discharge port for discharging the liquid obtained after solid-liquid separation, and the secondary liquid discharge port can be communicated with the liquid return port, so that the liquid is returned to the evaporation tank 140 again.

In addition, a third transfer pump 155c may be provided, and the third transfer pump 155c can pump the slurry discharged from the outlet to the cyclone 19a.

A slurry processing unit may be provided, and the slurry processing unit may include a disperser 19c capable of receiving the secondary slurry discharged from the slurry outlet and dispersing the secondary slurry, thereby making the secondary slurry The solid particles in the slurry are uniformly dispersed, so that they can be put into the pulping kettle 22 as raw materials, so that the secondary slurry can have a better reaction in the pulping kettle 22, for example, when the secondary slurry is a catalyst slurry , which can better complete the loading of active components. Among them, an ultrasonic disperser can be selected as the disperser 19c.

In order to improve the working efficiency, a secondary slurry collection tank 19b can be provided, and a secondary slurry collection chamber capable of accommodating the secondary slurry is arranged in the secondary slurry collection tank 19b, which can be installed on the secondary slurry collection tank 19b A secondary slurry inlet and a secondary slurry outlet are provided for the secondary slurry to enter and exit respectively, wherein the disperser 19c can be communicated with the cyclone 19a through the secondary slurry collection tank 19b, so that the cyclone The secondary slurry discharged from the slurry outlet of 19a can be collected in the secondary slurry collection tank 19b first, and when the pre-set amount is collected, it can be discharged into the disperser 19c for dispersion treatment, thereby improving the work efficiency. efficiency. In addition, a fourth transfer pump 155d may be provided which can pump the secondary slurry discharged from the secondary slurry collection tank 19b to the disperser 19c.

In addition, a second filter 19d may be disposed downstream of the disperser 19c, and the second filter 19d can filter out solid particles having a preset particle size in the secondary slurry discharged from the disperser 19c, by disposing the second filter 19d, the solid particles with the preset particle size in the secondary slurry can be filtered out, that is, the solid particles with the preset particle size can be filtered out from the secondary slurry, so that the secondary slurry can be used as a usable The raw materials are put into the pulping kettle 22 for reaction.

A seventh delivery pump 155g can be provided, which can pump the secondary slurry in the disperser 19c to the second filter 19d, and an eighth delivery pump 155h can be provided. The secondary slurry filtered by the second filter 19d is pumped to the pulping kettle 22 .

It should be noted that a first liquid level gauge can be set in the receiving tank 120, and the volume V ₁ of the slurry in the receiving tank 120 can be obtained through the first liquid level gauge. In addition, a second liquid level gauge can be set in the collecting tank 18a The liquid level gauge can obtain the volume V ₂ of the condensate in the collection tank 18a through the second liquid level gauge. The inventor's research found that when V ₂ /V ₁ ≥ 0.95, it indicates that the steam in the evaporation tank 140 reaches the required concentration, so the third delivery pump 155c can be started to pump the steam to the cyclone separator. 19a. In addition, a third liquid level gauge may be provided in the secondary slurry collection tank 19b, and the volume V ₃ of the secondary slurry in the secondary slurry collection tank 19b can be obtained through the third liquid level gauge.

In addition, when there is no material in the receiving tank 120 and the evaporation tank 140, the first delivery pump 155a, the second delivery pump 155b and the compressor 154 may be stopped.

The present invention also provides a slurry preparation system. The slurry preparation system 20 includes a pulping kettle 22 and a slurry recovery device provided by the present invention. The slurry recovery device is arranged downstream of the pulping kettle 22 and can receive the pulping kettle 22. The pulp discharged from the pulp kettle 22. By arranging the slurry recovery device provided by the present invention in the slurry preparation system 20, the slurry produced by flushing the pulping kettle 22 can be recovered and utilized, the utilization rate of materials is improved, and the waste of materials is greatly reduced. Wherein, the slurry outlet of the pulping kettle 22 may be communicated with the receiving tank inlet of the receiving tank 120 .

The present invention also provides a slurry recovery method, preferably, the slurry recovery device provided by the present invention can be used to recover the slurry, and the slurry recovery method includes the following steps: Step S10: Collecting the slurry, wherein the slurry can be recovered. The receiving tank 120 in the receiving unit 12 is used to receive the slurry, and when the predetermined amount of the slurry is collected, the next step can be performed; step S20: heating the slurry collected in the step S10 to obtain steam and steaming material , the slurry can be concentrated by step S20, so that the slurry reaches the required concentration, and then it can be put into the pulping kettle 22 as a raw material. High steaming material, steaming material can be put into pulping kettle 22 again as raw material for reaction to prepare product slurry. It can be understood that the slurry can be heated and concentrated by the evaporation tank 140 of the evaporation unit 14 .

In the step S20, the heating temperature is 80°C-95°C, and the slurry is heated within the above-mentioned temperature range, which not only ensures the heating efficiency, so that the slurry is concentrated to the preset concentration in time, but also ensures that the slurry is heated. quality.

In addition, in the step S20, the slurry collected in the step S10 may be heated in a stepwise heating manner. Preferably, the slurry collected in the step S10 can be heated in two steps. First, the collected slurry can be preheated to 50°C-70°C, and then the preheated slurry can be heated to 90°C. Above ℃, the slurry collected in the step S10 is heated by a gradual heating method, which not only ensures the heating efficiency, but also fully utilizes the energy of the material, so that excessive heat is not needed to heat the collected slurry. material.

The slurry recovery method may include the following steps: Step S40: cooling the steam to obtain a condensate, and the condensate obtained by cooling the steam may be recycled. For example, the condensate can be used as a solvent required for pulping, or pump It is sent to the nozzle 24 set in the pulping kettle 22, and the inner wall of the pulping kettle 22 is flushed to remove residues, so that no additional solvent such as water is needed for washing, which reduces material waste. The cooling method is not particularly limited. For example, the steam can be naturally cooled to below 50°C, or the steam can be cooled to below 50°C by using a cooling medium to cool the steam.

Preferably, the steam can be cooled in a stepwise cooling manner to obtain the condensate. For example, the steam can be cooled in two steps. First, the steam can be cooled to 50°C-70°C, and then the steam can be cooled to below 50°C. , and finally a condensate is obtained, wherein the condensate includes cooling water. The use of stepwise cooling to cool the steam not only ensures the cooling efficiency, but also cools the steam to a moderate temperature to obtain condensate.

In order to make full use of the condensate, the condensate can be filtered to filter out the solid particles in the condensate.

The volume of the obtained condensate and the volume of the slurry collected in the step S10 can be monitored in real time. As for the way to obtain the volume, such as the way to obtain the corresponding volume through the liquid level meter, it has been described in the foregoing content. It is not repeated here. Wherein, the volume of the condensate obtained by cooling the steam is V ₂ , the volume of the slurry collected in the step S10 is V ₁ , and when V ₂ /V ₁ ≥ 0.95, the volume of the condensate obtained in the step S20 is discharged The steaming material is discharged, that is, the steaming material in the evaporation tank 140 is discharged.

In addition, the obtained steamed material can also be subjected to secondary concentration to obtain a secondary slurry. For example, a cyclone 19a can be used to separate the steamed material from solid and liquid, thereby realizing the concentration of the steamed material, so that the steamed material can be concentrated. Reaching the preset concentration, in this way, it can be put into the pulping kettle 22 again as a raw material for reaction.

In order to improve the reaction efficiency, the secondary slurry can be dispersed, so that the solid particles in the secondary slurry are uniformly dispersed, wherein an ultrasonic disperser can be used to disperse the secondary slurry. Preferably, the secondary slurry can be dispersed for 5-15 minutes, whereby the solid particles in the secondary slurry can be uniformly dispersed.

In addition, the dispersed secondary slurry can be filtered to filter out solid particles with a preset particle size in the secondary slurry, so that larger impurities in the secondary slurry can be removed, so that , the filtered secondary slurry can be added to the pulping kettle 22 as a raw material for reaction.

The preferred embodiments of the present invention have been described above in detail with reference to the accompanying drawings, however, the present invention is not limited thereto. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solutions of the present invention, including the combination of various specific technical features in any suitable manner. In order to avoid unnecessary repetition, the present invention will not describe various possible combinations. However, these simple modifications and combinations should also be regarded as the contents disclosed in the present invention, and all belong to the protection scope of the present invention.

Claims (14)

1. A slurry recovery apparatus, comprising:

a receiving unit (12), the receiving unit (12) being arranged to be able to receive the slurry and discharge the slurry; and

an evaporation unit (14), the evaporation unit (14) being arranged downstream of the receiving unit (12), and the evaporation unit (14) being arranged to be able to receive the slurry discharged by the receiving unit (12) and to heat the slurry to obtain steam and a steamed material.

2. The slurry recovery apparatus according to claim 1, wherein the evaporation unit (14) comprises an evaporation tank (140), an evaporation chamber (144) capable of containing the slurry is provided in the evaporation tank (140), the evaporation unit (14) further comprises a heating portion capable of heating the slurry in the evaporation chamber (144), wherein:

the evaporation tank (140) is provided with an evaporation inlet for the slurry to enter the evaporation chamber (144), a steam outlet for discharging steam generated after the slurry is heated, and a discharge outlet for discharging the steam generated after the slurry is heated.

3. Slurry recovery apparatus according to claim 2, wherein said evaporation tank (140) is provided with a circulation inlet and a circulation outlet for the slurry to enter and exit, respectively;

the heating part comprises a first heat exchanger (152), and the first heat exchanger (152) is provided with a first heating inlet and a first heating outlet which are respectively used for the first medium to be heated to enter and exit, and a first cooling inlet and a first cooling outlet which are respectively used for the first heat exchange medium capable of exchanging heat with the first medium to be heated to enter and exit; wherein:

the first heating inlet is communicated with the circulating outlet, the first heating outlet is communicated with the circulating inlet, and the first cooling inlet is communicated with the steam outlet.

4. The slurry recovery apparatus according to claim 3, wherein the heating section includes a second heat exchanger (16), the second heat exchanger (16) having a second heating inlet and a second heating outlet through which a second medium to be heated enters and exits, and a second cooling inlet and a second cooling outlet through which a second heat exchange medium that can exchange heat with the second medium to be heated enters and exits, respectively; wherein:

the second heating inlet receives the slurry discharged by the receiving unit (12), the second heating outlet communicates with the evaporation inlet, and the second cooling inlet communicates with the first cooling outlet.

5. The slurry recovery apparatus according to claim 4, characterized in that the slurry recovery apparatus comprises:

a collecting tank (18a), wherein a collecting chamber capable of containing condensate is arranged in the collecting tank (18a), and a collecting tank inlet capable of being communicated with the second cooling outlet and a collecting tank outlet for discharging collected condensate are arranged on the collecting tank (18 a); and

a first filter (18b), the first filter (18b) being capable of receiving condensate discharged by the collection tank outlet and of filtering out solid particles of a predetermined size in the condensate.

6. The slurry recovery apparatus according to claim 3, wherein the evaporation unit (14) includes a gas-liquid separator (150), the gas-liquid separator (150) receiving the steam discharged from the steam outlet and performing gas-liquid separation of the steam, the gas-liquid separator (150) having a separator inlet into which the steam enters, a steam discharge outlet through which the steam obtained after gas-liquid separation is discharged, and a liquid discharge outlet through which the liquid obtained after gas-liquid separation is discharged; wherein:

the separator inlet is communicated with the steam outlet, and the first cooling inlet is communicated with the steam outlet through the steam outlet.

7. The apparatus for recovering pulp according to claim 6, wherein the evaporation unit (14) comprises a first communication pipe (153a) communicating the first cooling inlet and the steam discharge port, and a compressor (154) provided to the first communication pipe (153a), the compressor (154) being capable of compressing the steam in the first communication pipe (153 a); and/or

The evaporation unit (14) comprises a second communicating pipe (153b) communicating the first heating inlet and the circulation outlet, and a first delivery pump (155a) arranged on the second communicating pipe (153b), wherein the first delivery pump (155a) can pump the slurry in the second communicating pipe (153 b).

8. The slurry recovery apparatus according to any one of claims 2 to 7, characterized in that the slurry recovery apparatus comprises a cyclone (19a), and the cyclone (19a) is capable of receiving the distilled material discharged from the discharge port and performing solid-liquid separation on the distilled material.

9. The apparatus for recovering a slurry according to claim 8, wherein the cyclone separator (19a) has a discharge port through which a secondary slurry obtained after the solid-liquid separation is discharged;

the slurry recovery device comprises a slurry treatment unit, wherein the slurry treatment unit comprises a disperser (19c), and the disperser (19c) can receive the secondary slurry discharged from the slurry discharge port and disperse the secondary slurry; or

The slurry treatment unit comprises a disperser (19c) and a second filter (19d) arranged downstream of the disperser (19c), wherein: the disperser (19c) can receive the secondary slurry discharged from the slurry discharge port and disperse the secondary slurry, and the second filter (19d) can filter out solid particles with a preset particle size in the secondary slurry discharged from the disperser (19 c).

10. A pulp preparation system, characterized in that the pulp preparation system (20) comprises a pulping tank (22) and a pulp recovery device according to any one of claims 1-9, which is arranged downstream of the pulping tank (22) and is capable of receiving pulp discharged by the pulping tank (22).

11. A method of slurry recovery, comprising the steps of:

step S10: collecting the slurry;

step S20: heating the slurry collected in the step S10 to obtain steam and a steamed material.

12. The slurry recovery method according to claim 11, wherein, in the step S20, the heating temperature is 80-95 ℃; or

The slurry collected in the step S10 is heated stepwise.

13. The slurry recovery method according to claim 11, characterized in that it comprises the steps of: step S40: cooling the vapor to obtain a condensate; preferably, in the step S40, the steam is gradually cooled to obtain a condensate.

14. The slurry recovery method according to claim 13, wherein the volume of condensate resulting from cooling the steam is V₂The volume of the slurry collected in the step S10 is V₁Wherein: v₂/V₁And discharging the steamed material obtained in the step S20 when the content of the steamed material is more than or equal to 0.95.

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