CN103045321A - Method for drying and upgrading lignite - Google Patents
Method for drying and upgrading lignite Download PDFInfo
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- CN103045321A CN103045321A CN2012105832749A CN201210583274A CN103045321A CN 103045321 A CN103045321 A CN 103045321A CN 2012105832749 A CN2012105832749 A CN 2012105832749A CN 201210583274 A CN201210583274 A CN 201210583274A CN 103045321 A CN103045321 A CN 103045321A
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Abstract
本发明用于褐煤干燥及成型技术领域，具体涉及一种褐煤干燥提质的方法：褐煤原煤由原料煤仓通过输送设备送入筛分破碎装置后进行破碎、筛分；筛碎后的褐煤进入射流粉碎干燥机进行一级干燥，干燥后的煤粉由旋流器收集；一级干燥后的煤粉由输送设备输送到管式干燥机进行二级干燥；完成二级干燥提质的煤粉直接输送进入成型设备垫压制成型煤后输送到网带进行冷却。本褐煤干燥提质方法，实现破碎、粉碎、干燥、成型等的优化组合，解决了目前褐煤干燥技术中存在的能耗高、系统调控困难、运行不稳定、安全性能低等问题，具有安全、节能、环保、高效、稳定等优点；制得的型煤具有一定粒度和压实度，解决了褐煤在运输储存过程中易风化破碎、易自燃等问题。
The invention is used in the technical field of lignite drying and forming, and in particular relates to a method for drying and upgrading lignite: lignite raw coal is sent to a screening and crushing device from a raw material coal bunker through conveying equipment for crushing and screening; the crushed lignite enters The jet crushing dryer performs primary drying, and the dried coal powder is collected by the cyclone; the primary dried coal powder is transported to the tubular dryer by the conveying equipment for secondary drying; the secondary drying and upgrading of the coal powder is completed It is directly conveyed into the forming equipment pad to press the formed coal, and then conveyed to the mesh belt for cooling. This lignite drying and upgrading method realizes the optimized combination of crushing, crushing, drying, forming, etc., and solves the problems of high energy consumption, difficult system regulation, unstable operation, and low safety performance in the current lignite drying technology. It has the advantages of energy saving, environmental protection, high efficiency, and stability; the prepared briquettes have a certain particle size and compaction degree, which solves the problems that lignite is easy to be weathered and broken, and easy to spontaneously combust during transportation and storage.
Description
Technical field
The present invention relates to a kind of method of brown coal drying and upgrading, be used for brown coal drying and field shaping technique.
Background technology
Brown coal are that a kind of high-volatile, high moisture content, ash-rich, low heat value, low ash smelting point, easy-weathering are cracked, the inferior fuel of easy oxidation and spontaneous combustion, are the minimum pit coals of degree of coalification.China's lignite resource is relatively abundant, and 1,903 hundred million tons of prognostic resourcess account for 41.18% of national coal prognostic resources.The fat coal resources such as the bituminous coal of China, hard coal have been fully utilized, and it is limited to expand space, and large-scale developing and utilizing of brown coal just just begun,
High-moisture in the brown coal has directly increased transportation cost, plant construction and running cost, even affects the normal operation of production equipment, has reduced generating take brown coal as raw material or the economy of Coal Chemical Engineering Project.Ripe coal drying and dewatering technology has high temperature drying and middle temperature is dried method both at home and abroad, be that the gas temperature of drying installation entrance is generally more than 300 ℃, these two kinds of drying meanss are applicable to the bituminous coal of high metamorphic grade, anthracitic drying and dehydrating, but when being used for the brown coal drying of low metamorphic grade, then exist coal easily to catch fire, easily occur the problems such as dust explosion, be difficult to steady running, poor safety performance.
The characteristics such as brown coal are low because of its calorific value, water content is high, volatile matter is high, poor heat stability, high, the easy spontaneous combustion of chemically reactive, easy-weathering fragmentation, be difficult to transportation, store and sell, behind brown coal drying and upgrading, make the moulded coal with certain particle size and compactness, to make its various aspects of performance all be better than the brown coal raw coal, and can effectively solve brown coal problems such as easy-weathering fragmentation, easy oxidation and spontaneous combustion in transportation, storage process, thereby the drying and upgrading of brown coal and forming technique become one of main direction of studying of in recent years brown coal processing and application facet.
Summary of the invention
According to above deficiency of the prior art, the technical problem to be solved in the present invention is: provide the method for the brown coal drying and upgrading of the technical optimization combinations such as a kind of fragmentation that can realize brown coal, pulverizing, drying, moulding, safety, energy-saving and environmental protection, efficient and stable.
The method of brown coal drying and upgrading of the present invention is characterized in that: comprise following technical process:
1. the brown coal raw coal carries out fragmentation, screening after sending into the screening shredder assembly by the raw material coal bunker by handling equipment;
2. sieve brown coal after broken and enter the jet mill drying machine and carry out the one-level drying, dried coal dust is collected by swirler;
3. be transported to pipe drier through the dried coal dust of one-level by handling equipment and carry out secondary drying;
4. the coal dust of finishing the secondary drying upgrading directly delivers into the molding device pad and is pressed into and is transported to guipure behind the moulded coal and cools off.
Described screening shredder assembly is one or more the combination in toothed roll crusher, plate-hammer crusher, roll crusher, jaw crusher, relaxation sieve, live-roll grizzly, the reciprocating sieve.
Step enters the brown coal granularity of jet mill drying machine less than 50mm in 2..
Step 2. in by the jet mill drying machine pulverize, dried coal powder size is less than 3mm.
Described pipe drier comprises swing roller and is arranged in the drying tube of swing roller, and the water conservancy diversion screw-blade is set in the drying tube, passes into heat-transfer medium around the inner drying tube of swing roller.
Described heat-transfer medium is a kind of in flue gas, superheated vapour, the warm air, and temperature is lower than 200 ℃.
Described handling equipment is a kind of of screw feeder, scrapper conveyor or pipe chain transfer roller.
Described molding device is a kind of of impact briquetting machine, roller briquetting machine, screw extrusion press or honey-comb briquet.
Described fly-ash separator is electrostatic precipitator or water-bath type dust cleaner.
The air-flow of the dry dust of carrying under one's arms of discharging of described one-level and secondary drying are discharged takes wet gas current and enters fly-ash separator and carry out after the dust removal process emptyingly, and the black water of formation carries out sewage disposal, is conducive to environment protection.
Principle of work and process:
The brown coal raw coal is broken after sending into the screening shredder assembly by the raw material coal bunker by handling equipment, screening, enter the jet mill drying machine less than the brown coal of 50mm and carry out the one-level drying, drying and Crushing Behavior by air-flow in the jet drying process, removing portion of water also is crushed to the granularity of coal below the 3mm, be transported to pipe drier by handling equipment after dried coal dust is collected by swirler and carry out secondary drying, coal dust is uniformly distributed in numerous drying tubes of swing roller inside, coal moves in drying tube by the guide functions of gravity and water conservancy diversion screw-blade, around the inner drying tube of cylinder, pass into heat-transfer medium, make by indirect heat exchange that the moisture of coal is subjected to thermal evaporation in the drying tube.Because the granularity of coal dust has reached forming requirements after the one-level drying, one-level fragmentation, screening plant have been save, efficient more economically, avoided simultaneously the loss of heat in secondary breaking, screening process, can directly to enter the molding device pad molded so that coal dust does not need again to heat behind secondary drying, and the moulded coal that makes is transported to guipure and cools off.The air-flow of the dry dust of carrying under one's arms of discharging of one-level and secondary drying are discharged takes wet gas current and enters fly-ash separator and carry out after the dust removal process emptyingly, and the black water of generation is sent to sewage disposal.
The beneficial effect that the present invention compared with prior art has is:
This dry method for upgrading takes full advantage of drying and the Crushing Behavior of air-flow in the jet drying process, having saved the one-level brown coal pulverizes and screening plant, by brown coal are carried out the jet drying, removing portion of water also is crushed to the granularity of coal below the 3mm, improved the working efficiency of pipe drier and prevented that coal dust from stopping up in drying tube, avoided by the dried coal dust of pipe drier through again crushing and screening the calorific loss of generation, so that efficient more economically; Redrying by pipe drier also promotes the temperature of coal, make drop temperature satisfy followed by hot-forming temperature requirement; Coal dust behind the drying and upgrading is made the moulded coal with certain particle size and compactness by formation system, and its various aspects of performance all is better than the brown coal raw coal, and can effectively solve brown coal problems such as easy-weathering fragmentation, easy spontaneous combustion in the transportation storage process; Brown coal drying and upgrading method of the present invention, realized the optimum combination of the technology such as fragmentation, pulverizing, drying, moulding, the problem such as solved that the energy consumption that exists in the present brown coal drying technology is high, system regulation is difficult, fluctuation of service, safety performance are low has safety, energy-saving and environmental protection, the advantage such as efficient, stable.
Description of drawings
Fig. 1 is structural representation of the present invention.
Among the figure: 1, raw material coal bunker; 2, screening shredder assembly; 3, jet mill drying machine; 4, swirler; 5, handling equipment; 6, pipe drier; 7, molding device; 8, fly-ash separator; 9, induced draft fan.
Embodiment
Below in conjunction with accompanying drawing embodiments of the invention are described further:
As shown in Figure 1, the brown coal raw coal is broken after sending into screening shredder assembly 2 by raw material coal bunker 1 by handling equipment, screening, enter jet mill drying machine 3 less than the brown coal of 50mm and carry out the one-level drying, brown coal are decomposed under action of high-speed airflow, be broken into the fine particle of granularity below 3mm, and proposition part moisture wherein, be transported to pipe drier 6 by handling equipment 5 after dried coal dust is collected by swirler 4 and carry out secondary drying, because the granularity of coal dust has reached forming requirements after the one-level drying, it is broken to have save one-level, screening plant, avoided simultaneously in secondary breaking, the loss of heat in the screening process, so that not needing again to heat, coal dust can directly not enter molding device 7 behind secondary drying, pad is pressed into and is transported to guipure behind the moulded coal and cools off, the air-flow of the dry dust of carrying under one's arms of discharging of one-level and secondary drying are discharged, and to take wet gas current emptying after entering fly-ash separator 8 under the effect of induced draft fan 9 to carry out dust removal process, and the black water of generation is sent to sewage disposal.
Claims (10)
1. the method for a brown coal drying and upgrading is characterized in that: comprise following technical process:
1. the brown coal raw coal carries out fragmentation, screening after sending into screening shredder assembly (2) by raw material coal bunker (1) by handling equipment (5);
2. sieve brown coal after broken and enter jet mill drying machine (3) and carry out the one-level drying, dried coal dust is collected by swirler (4);
3. be transported to pipe drier (6) through the dried coal dust of one-level by handling equipment (5) and carry out secondary drying;
4. the coal dust of finishing the secondary drying upgrading directly delivers into molding device (7) pad and is pressed into and is transported to guipure behind the moulded coal and cools off.
2. the method for brown coal drying and upgrading according to claim 1 is characterized in that: described screening shredder assembly (2) is one or more the combination in toothed roll crusher, plate-hammer crusher, roll crusher, jaw crusher, relaxation sieve, live-roll grizzly, the reciprocating sieve.
3. the method for brown coal drying and upgrading according to claim 1 is characterized in that: step enters the brown coal granularity of jet mill drying machine (3) less than 50mm in 2..
4. the method for brown coal drying and upgrading according to claim 1, its heat symptom-complex is: step 2. in by jet mill drying machine (3) pulverize, dried coal powder size is less than 3mm.
5. the method for brown coal drying and upgrading according to claim 1, it is characterized in that: described pipe drier (6) comprises swing roller and is arranged in the drying tube of swing roller, the water conservancy diversion screw-blade is set in the drying tube, passes into heat-transfer medium around the inner drying tube of swing roller.
6. the method for brown coal drying and upgrading according to claim 5 is characterized in that: described heat-transfer medium is a kind of in flue gas, superheated vapour, the warm air, and temperature is lower than 200 ℃.
7. the method for brown coal drying and upgrading according to claim 1 is characterized in that: described handling equipment (5) is a kind of of screw feeder, scrapper conveyor or pipe chain transfer roller.
8. the method for brown coal drying and upgrading according to claim 1, it is characterized in that: described molding device (7) is a kind of of impact briquetting machine, roller briquetting machine, screw extrusion press or honey-comb briquet.
9. the method for brown coal drying and upgrading according to claim 1, it is characterized in that: described fly-ash separator (8) is electrostatic precipitator (8) or water-bath type dust cleaner (8).
10. the method for brown coal drying and upgrading according to claim 1, it is characterized in that: the air-flow of the dry dust of carrying under one's arms of discharging of described one-level and secondary drying are discharged takes wet gas current and enters fly-ash separator (8) and carry out after the dust removal process emptyingly, and the black water of formation carries out sewage disposal.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210583274.9A CN103045321B (en) | 2012-12-28 | 2012-12-28 | Method for drying and upgrading lignite |
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| CN201210583274.9A CN103045321B (en) | 2012-12-28 | 2012-12-28 | Method for drying and upgrading lignite |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103225804A (en) * | 2013-05-21 | 2013-07-31 | 吕伟鹏 | Method for combusting lignite in rotary kiln under high temperature |
| CN103803769A (en) * | 2014-01-13 | 2014-05-21 | 重庆交通大学 | Vertical inter-partition sludge drying method and equipment with crushing and safety monitoring functions |
| CN104031714A (en) * | 2014-06-13 | 2014-09-10 | 洛阳矿山机械工程设计研究院有限责任公司 | Upgrading process for lignite drying and forming |
| CN106675682A (en) * | 2016-06-20 | 2017-05-17 | 中国矿业大学 | Process for preparing biomass briquette coal by dehydrating and upgrading lignite |
| CN111644450A (en) * | 2020-06-29 | 2020-09-11 | 盐城工学院 | Organic household garbage treatment system and method |
| CN114993025A (en) * | 2022-06-28 | 2022-09-02 | 浙江迪邦化工有限公司 | Continuous drying device and method for N, N-cyanoethyl benzyl aniline |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103225804A (en) * | 2013-05-21 | 2013-07-31 | 吕伟鹏 | Method for combusting lignite in rotary kiln under high temperature |
| CN103225804B (en) * | 2013-05-21 | 2015-04-08 | 吕伟鹏 | Method for combusting lignite in rotary kiln under high temperature |
| CN103803769A (en) * | 2014-01-13 | 2014-05-21 | 重庆交通大学 | Vertical inter-partition sludge drying method and equipment with crushing and safety monitoring functions |
| CN104031714A (en) * | 2014-06-13 | 2014-09-10 | 洛阳矿山机械工程设计研究院有限责任公司 | Upgrading process for lignite drying and forming |
| CN104031714B (en) * | 2014-06-13 | 2015-12-02 | 洛阳矿山机械工程设计研究院有限责任公司 | The process for upgrading that a kind of brown coal drying is shaping |
| CN106675682A (en) * | 2016-06-20 | 2017-05-17 | 中国矿业大学 | Process for preparing biomass briquette coal by dehydrating and upgrading lignite |
| CN106675682B (en) * | 2016-06-20 | 2019-07-02 | 中国矿业大学 | A process for preparing biomass briquette by dehydration and upgrading of lignite |
| CN111644450A (en) * | 2020-06-29 | 2020-09-11 | 盐城工学院 | Organic household garbage treatment system and method |
| CN114993025A (en) * | 2022-06-28 | 2022-09-02 | 浙江迪邦化工有限公司 | Continuous drying device and method for N, N-cyanoethyl benzyl aniline |
| CN114993025B (en) * | 2022-06-28 | 2024-06-07 | 浙江迪邦化工有限公司 | Continuous drying device and method for N, N-cyanoethyl benzyl aniline |
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