CN101928619B - Forming method of lignite lump coal facilitating container transport - Google Patents
Forming method of lignite lump coal facilitating container transport Download PDFInfo
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- CN101928619B CN101928619B CN 201010265756 CN201010265756A CN101928619B CN 101928619 B CN101928619 B CN 101928619B CN 201010265756 CN201010265756 CN 201010265756 CN 201010265756 A CN201010265756 A CN 201010265756A CN 101928619 B CN101928619 B CN 101928619B
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Abstract
The invention discloses a forming method of a lignite lump coal facilitating container transport, which comprises the following steps of: (1) treating raw materials: adjusting the temperature of lignite powder to between 95 and 105 DEG C and the water content to between 12 and 14 percent (weight) by using a drying device; (2) pressing and forming: pressing the lignite powder by using a hydraulic machinery, controlling the pressing pressure to more than 35 MPa, and pressing for three to four times; and (3) cooling: naturally cooling the pressed lump coal by standing. The forming method of lignite lump coal facilitating the container transport has the advantages of simple processing technology, high water resistance and stability of the formed lump coal, contribution to the container transport by sea and land, low dust pollution of coal during use, contribution to environmental protection and great promotion of mining and use of Australian lignite and other lignite.
Description
Technical field
The present invention relates to a kind of brown coal coal cinder forming method, especially relate to a kind of brown coal coal cinder forming method of being convenient to encased conveying, high for water ratio, that burning-point is very low Australia young brown coal coal cinder moulding is particularly applicable, also can be used for the low-calorie coal of other high-moisture percentages.
Background technology
Brown coal have the advantage of cleaning, low volatilization and low-sulfur, but exist again high humidity, burning-point is low and CO2 emissions is large shortcoming simultaneously, and poor heat stability, and chemically reactive is high, and easily spontaneous combustion is difficult to transportation, stores and sells.Because global energy day is becoming tight, the economic worth of brown coal also highlights gradually, and the country that has a lignite resource is act as a fuel using method and consumptions of coal of active research brown coal all now.Brown coal are main power generation energy resources of Victoria,Australia, raise uncle's mountain valley standing stock and have 1,600 hundred million tons drawing, and account for 20% of global reserves, occupy the second of world saving.Dimension state brown coal are mainly young brown coal, moisture height (generally in 60% left and right), and burning-point very low (170 ℃ of left and right), and ash content few (can＜5%), calorific value can reach 6000Kcal/Kg.Due to the dry technology of brown coal comparative maturity, wherein too much moisture can use special-purpose drying plant to remove, and then can be as fuel heating or generating.At present, dimension state brown coal generating total amount is about 7000MWH, accounts for 30% left and right of Australia's generating total amount.The thickness of coal seam large (not waiting from 60-300 rice) of dimension state brown coal and tectum only are 5-10 rice, can be used for extensive near coal-mine employing, the direct generation of electricity cost of dimension state brown coal only has 3 Australian Dollars/MWH like this, is 1/3 to 1/4 of Australia's black coal cost of electricity-generating, 1/6 to 1/7 of Sweet natural gas.
The economic and trade ties development of current Australia and China rapidly, in Jan-Sept, 2009, bilateral trade volume reached nearly 20,000,000,000 dollars, wherein energy trading accounts for suitable proportion, but with the Australia Mineral Products Trade in, compare with iron ore, coal, non-ferrous metal etc., brown coal are still a blank, and the transportation problem of this and brown coal has much relations.A large amount of outlets of these mineral products or the energy can only rely on the freight container sea-freight basically; and because China will exceed much than the product from these national imports to China the exported product of Australia or country in Southeast Asia; the situation that many freight container zero loads on the cargo ship from Australia to China so often can occur; if the transportation that can utilize these resources to carry out brown coal obviously can reduce the use cost of Australia brown coal, yet the low strength of the inflammable and explosive characteristic of powdery brown coal and common coal cinder makes it and is not suitable for directly using encased conveying.
Chinese patent application 200610150125 discloses a kind of low-disintegration coal binder free hot-press molding method and device, and the method comprises the following steps: it is that particle diameter is less than the coal dust of 3mm that low-disintegration coal is pulverized; The gained coal dust is dried to water content lower than 3% in pneumatic dryer and/or fluidized bed dryer; Coal dust after drying is heated to 150-460 ℃ in the thermal reactor of operate continuously; With the coal dust compression moulding after heating.The high processing cost that causes increases thereby the method not only consumes energy, and Heating temperature is up to 460 ℃, thereby and is not suitable for the moulding of Australia young brown coal of burning-point very low (170 ℃ of left and right).
Summary of the invention
Purpose of the present invention is exactly the problems referred to above that exist for prior art, and provide that a kind of complete processing is simple, intensity is high and water tolerance and good security, be convenient to the brown coal coal cinder forming method of encased conveying, prepare ultimate compression strength can reach 16MPa and above lump coal under the binder free condition by controlling suitable temperature and water ratio, be convenient to long sea voyage or land transportation and after use.
For realizing above-mentioned purpose of the present invention, a kind of brown coal coal cinder forming method of being convenient to encased conveying of the present invention reaches step by the following technical solutions:
(1) raw material is processed: regulate the temperature of brown coal powder by drying installation at 100 ℃ ± 5 ℃, water ratio 12%-14% (weight).
Described water ratio and temperature are parameters optimization, and the concrete time that reaches this condition can be determined through overtesting according to different drying installations, also can automatically reach the control to condition in the drying plant with temperature and the online measuring ability of water ratio.It should be noted that temperature and water ratio need accurately to control, less departing from can cause the significantly reduction of shaped coal bulk strength, and temperature can not be too high, dry brown coal powder very easily spontaneous combustion in the time of 170 ℃.
Described temperature is optimum at 100 ℃, and described water ratio the best is 13% (weight).
The granularity of described brown coal powder is advisable for-1mm content (weight) 〉=95%.
(2) compression moulding: brown coal powder is suppressed by hydraulic machinery, compacting pressure＞35MPa, the compacting pattern is 3-4 compacting, to guarantee the exhaust of brown coal powder pore in compacting process.
Each pressing cycle is 15-20 second.
The KDQ100 press of selling on the preferred market of hydraulic machinery, compacting pattern are preferably 3 times, and the coal cinder size changes by the mould that uses different sizes, also can customize according to relevant criterion.
(3) cooling: the lump coal by standing naturally cooling after compacting.
The present invention is applicable to young brown coal, but is not limited to this, also can be used for other high-moisture percentages, low-calorie coal.The present invention can obtain best condition of molding and compacting parameter through limited test according to different raw coal when reality is used.
In the present invention, institute's employing equipment all belongs to the common device in mineral processing industry, every can reach the processing parameter requirement especially to molding device pressure be key parameter all can be used for the present invention.
Compare present prior art, a kind of brown coal coal cinder forming method of being convenient to encased conveying of the present invention has following positively effect:
(1) the present invention utilizes hydropress to prepare lump coal for molding device, the ultimate compression strength of its block can reach 16MPa, water-tolerant can satisfy the processes such as encased conveying and loading and unloading to the requirement of strength and stability, has solved long-distance transport and coal dust pollution problem during young brown coal is utilized.By controlling suitable moisture and temperature, can obtain high-intensity lump coal under lower pressing pressure, reduced the requirement of shaped device and the loss of mould are convenient to popularize.
(2) raw material uses hydropress to suppress, with other shaped device such as the roller pressure forming machine to compare forming pressure high, can obtain to have the lump coal of better transport performance, and its monolithic compact dimensions is easy to control by mould.
(3) can control suitable material temperature and water ratio makes the forming pressure of finished product hydropress when reaching same ultimate compression strength can drop to minimum.
(4) the present invention will have good promoter action to Australia brown coal and other Lignite Mine with using, thereby bring considerable Social benefit and economic benefit.
Chinese patent disclosed " hot-press shaping technology for powdered coal " (publication number CN 98114008.4) makes coal dust enter moulding humidity province with Chinese patent disclosed " low-disintegration coal binder free hot-press molding method and device " (publication number CN 101168694A) by dry and heating, then uses the pair roller single-lead-screw extruding briquetting machine to be pressed into the ribbing.Compare with it, the present invention is that to utilize hydropress to make its intensity of lump coal as shaped device higher and directly become piece, be fit to encased conveying, during moulding, water ratio is higher saves dry link power consumption, more is applicable to enrich pore and the more young brown coal of moisture.
Embodiment
Below in conjunction with embodiment, a kind of brown coal coal cinder forming method of being convenient to encased conveying of the present invention is described in further detail.
1. the temperature moisture control of raw material
Brown coal powder (granularity 1mm following) is inserted loft drier carry out drying, first carry out cryodrying, temperature is heightened during near required value when water ratio, can take out compacting (three groups of samples) when temperature and water ratio all reach requirement.
The water ratio of table 1 sample and temperature
| Sequence number | Water ratio (% by weight) | Temperature (℃) |
| Sample 1 | 17 | 80 |
| Sample 2 | 13 | 100 |
| Sample 3 | 10 | 100 |
2. lump coal compacting
Cloth system with the coal dust handled well by hydropress KDQ100 carries out cloth, and cloth piece number is 2, forming pressure 88t; Adopt three times the compacting pattern; A pressing cycle is 15-20 second.Shaped coal is block-shaped is rectangular parallelepiped, size 120mm * 80mm * 40mm.
3. the demoulding
Automatic demoulding after compacting is completed because the hot pressing brown coal have certain viscosity, can cause demoulding difficulty, can solve by acquiring hydro-cylinder increase knockout press.Automatically coal cinder is pressed from both sides to setting machine by clamper after the demoulding.
4. standing cooling
Naturally standing after compression moulding, the intensity of cooling rear lump coal can reach the requirement of encased conveying.
5. strength test
The lump coal that preparation is completed is cut into the cubes fritter of 5cm, as the strength test sample.
(1) qualitative test: sample 2 is in 2m eminence whereabouts crack-free phenomenon.
(2) quantitative test: use the YA-100B compression Strength testing machine to carry out strength test.
Table 2 moulded coal physical attribute
| Sequence number | Density (g/cm3) | Ultimate compression strength (MPa) | Folding strength (MPa) |
| Sample 1 | 1.01 | 2.6 | 0.8 |
| Sample 2 | 1.15 | 16.5 | 5.1 |
| Sample 3 | 1.025 | 9.5 | 2.9 |
6. water tolerance test
Sample is placed in water three days, inserts and observed once in rear three hours, observe once later every day, and result shows that sample 1 has the phenomenon of scattering, and sample 2 and sample 3 are without scattering phenomenon.
7. soundness test
Use the above-mentioned lump coal of cutting machine high-speed cutting to occur without combustion phenomena.
The lump coal of the present invention's development uses hydro-mechanical unit compression moulding, and ultimate compression strength can reach 16MPa, satisfies the encased conveying requirement.Whole process need not to add any binding agent to the processing of coal dust, need not very low water ratio namely plastic, can save production energy consumption like this.The moulding process of coal dust can be carried out closure and processed, and the lump coal after moulding can significantly reduce the dust pollution of coal in use procedure subsequently, is conducive to protection of the environment.
Claims (3)
1. brown coal coal cinder forming method of being convenient to encased conveying is characterized in that comprising the following steps:
(1) raw material is processed: the temperature of regulating brown coal powder by drying installation is 13% at 100 ℃ ± 5 ℃, by weight water ratio, and the granularity of described brown coal powder is-1mm weight content 〉=95%;
(2) compression moulding: brown coal powder is suppressed compacting pressure by hydraulic machinery〉35MPa, the compacting pattern is 3-4 compactings, each pressing cycle is 15-20 second;
(3) demoulding: automatic demoulding after compacting is completed increases knockout press by acquiring hydro-cylinder in this process;
(4) cooling: the lump coal by standing naturally cooling after compacting.
2. a kind of brown coal coal cinder forming method of being convenient to encased conveying as claimed in claim 1 is characterized in that: described compacting pattern is 3 compactings.
3. a kind of brown coal coal cinder forming method of being convenient to encased conveying as claimed in claim 1 or 2 is characterized in that: shaped coal is block-shaped is rectangular parallelepiped, size 120mm * 80mm * 40mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010265756 CN101928619B (en) | 2010-08-23 | 2010-08-23 | Forming method of lignite lump coal facilitating container transport |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010265756 CN101928619B (en) | 2010-08-23 | 2010-08-23 | Forming method of lignite lump coal facilitating container transport |
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| CN101928619A CN101928619A (en) | 2010-12-29 |
| CN101928619B true CN101928619B (en) | 2013-06-26 |
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| CN 201010265756 Expired - Fee Related CN101928619B (en) | 2010-08-23 | 2010-08-23 | Forming method of lignite lump coal facilitating container transport |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105546945B (en) * | 2016-01-07 | 2018-08-03 | 河北志诚物流有限公司 | A kind of moulded coal drying process and moulded coal hurricane drier |
| RU2661881C1 (en) * | 2018-04-20 | 2018-07-20 | Сергей Иванович Цыбульский | Method of coal briquetting |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5658357A (en) * | 1995-03-21 | 1997-08-19 | The Curators Of The University Of Missouri | Process for forming coal compact without a binder |
| US6375690B1 (en) * | 1995-03-17 | 2002-04-23 | The Curators Of The University Of Missouri | Process for forming coal compacts and product thereof |
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- 2010-08-23 CN CN 201010265756 patent/CN101928619B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6375690B1 (en) * | 1995-03-17 | 2002-04-23 | The Curators Of The University Of Missouri | Process for forming coal compacts and product thereof |
| US5658357A (en) * | 1995-03-21 | 1997-08-19 | The Curators Of The University Of Missouri | Process for forming coal compact without a binder |
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| CN101928619A (en) | 2010-12-29 |
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Address after: 243041 Anhui city in Ma'anshan province north of the revitalization of economic and Technological Development Zone, Road No. 555 Applicant after: Anhui Keda Electromechanical Co., Ltd. Applicant after: Guangdong Keda Electromechanical Co., Ltd. Address before: 243041 Anhui city in Ma'anshan province north of the revitalization of economic and Technological Development Zone, Road No. 555 Applicant before: Ma Anshan Keda Industrial Co., Ltd. Applicant before: Guangdong Keda Electromechanical Co., Ltd. |
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