CN103146435B - High-moisture coal pulverizing, drying and conveying apparatus and method thereof - Google Patents
High-moisture coal pulverizing, drying and conveying apparatus and method thereof Download PDFInfo
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Abstract
The invention relates to a high-moisture coal pulverizing, drying and conveying apparatus and a method thereof. The coal pulverizing, drying and conveying apparatus is characterized in that the apparatus comprises a raw coal bunker, a feeder, a hot blast stove, a nitrogen distributor, a circulating fan, a mixer, a pre-drier, a coal pulverizer, a dynamic and static separator, a bag deduster, a low pressure bunker, a variable pressure bunker, a feeding bunker and a gasification nozzle, the raw coal bunker is connected with the feeder, the feeder is connected with the inlet of the pre-drier, and the inertia hot air at the outlet of the hot blast stove is divided into two airflows which are connected with the pre-drier and the coal pulverizer respectively; and the coal pulverizer is provided with the dynamic and static separator, the outlet of the dynamic and static separator is connected with the deduster, the gas outlet of the deduster is connected with the circulating fan, the pulverized coal outlet of the deduster is connected with the low pressure bunker, the low pressure bunker is connected with the variable pressure bunker, and the variable pressure bunker is connected with the feeding bunker. The apparatus has a wide application range of coal kinds, and is especially suitable for the drying and the pulverization of coals comprising high-moisture brown coal and the like; and the granularity distribution and the water content of the prepared pulverized coal are adapted to requirements of a gasification furnace.
Description
Technical field
The present invention relates to a kind of mill coal drying and carrying method and device of the coal for gasification furnace of pressurized aerated bed, particularly a kind of mill coal drying and e Foerderanlage and method that can be applicable to high moisture content coal.
Background technology
Air-flow bed coal-gasification is because effective gas composition transformation efficiency high, coal is high and obtained application widely in the world than oxygen consumption with than advantages such as coal consumption are low, air-flow bed coal-gasification technology is mainly divided into powdered coal pressuring gasified and water coal slurry pressure gasification, and the Typical Representative of coal gasification has: the single nozzle water wall gasification that two-part bed pulverized coal gasification technology, space flight furnace gas, GSP gasification, East China University of Science and the Ningbo engineering corporation of China Petrochemical Industry of Shell gasification, Xi'an thermal technology institute develops jointly etc.; Water coal slurry pressure gasification technology Typical Representative has: the classification oxygen supply coal water slurry gasification of the multiple-nozzle contraposition type coal water slurry gasification of GE coal water slurry gasification, East China University of Science, the gasification of the polynary slurry of Xibei Chemical Inst and Tsing-Hua University etc.
Entrained flow gasification has specific strict demand to the granularity of coal dust and water content, coal powder size distribution and water content directly have influence on the output of transformation efficiency and the synthetic gas of gasification reaction, therefore how preparing and carry the qualified dry pulverized coal of applicable gasifier bed vapourizing furnace is one of gordian technique of entrained flow gasification, powder process and delivery system are directly connected to energy consumption and the steady running of whole gasification island system, existing powder-making technique, running cost and energy consumption are high, be difficult to adapt to the low grade coals such as high-moisture brown coal and bitumionus coal, pulverized coal preparation system granularity and water content are difficult to reach the requirement of gasification.Chinese patent CN101761933A discloses a kind of utilization and has extracted part stove cigarette as inert media and part drying medium, be mixed into the dry coal dust of coal pulverizer with the hot blast of air preheater outlet, but in most of coal gasification apparatus, there is no the hot flue gas of station boiler and the hot blast that air preheater produces, and lower than prescribed value, there is potential safety hazard in the oxygen level that the method is difficult to guarantee well system.
Mill coal drying of the present invention and e Foerderanlage and method, coal dust adaptability to high-moisture is good, can obtain the dry pulverized coal of the low and rational size distribution of water content, dry pulverized coal enters vapourizing furnace by e Foerderanlage and gasifies, dry rear coal dust delivers into vapourizing furnace by coal dust and reacts, and has improved significantly coal gasification operation stability, reliability and synthesis gas yield.
Summary of the invention
The object of this invention is to provide a kind of can powder process and the apparatus and method of conveying, to solve the shortcoming that is difficult to adapt to the coal fuel pulverizing plants such as high-moisture brown coal in existing gasification installation, can obtain that water content is low, the coal dust of rational size distribution is for gasification reaction.
In order to achieve the above object, the invention provides a kind of mill coal drying and e Foerderanlage, it is characterized in that, comprise run coal bin, feeding machine, hotblast stove, nitrogen distributor, recirculation blower, mixing tank, predrying device, coal pulverizer, sound state separator, sack cleaner, low pressure storehouse, transformation storehouse, feed hopper and gasification nozzle, run coal bin outlet is connected with the import of feeding machine by pipeline, the outlet of feeding machine is connected with the coal dust import of predrying device by pipeline, the discharge of predrying device is connected with the opening for feed of coal pulverizer by pipeline, on coal pulverizer, be provided with sound state separator, sound state separator has qualified discharge and defective discharge, defective discharge connects coal pulverizer, qualified discharge connects the coal dust import of sack cleaner by pipeline, the meal outlet of sack cleaner connects the import in low pressure storehouse, the outlet in low pressure storehouse connects the import in transformation storehouse by pipeline, the outlet in transformation storehouse connects the import of feed hopper by pipeline, the outlet of feed hopper connects gasification nozzle by pipeline, on hotblast stove, be provided with air intlet and fuel inlet and recycle gas import, the outlet of hotblast stove connects the first import of mixing tank, the second import of mixing tank connects nitrogen distributor, the first hot-blast outlet of mixing tank is connected with predrying device by pipeline, the second hot-blast outlet is connected with the gas feed of coal pulverizer by pipeline, nitrogen distributor also connects sack cleaner, low pressure storehouse, transformation storehouse and feed hopper, the pneumatic outlet of predrying device connects sack cleaner, the pneumatic outlet of sack cleaner connects recirculation blower, the outlet of recirculation blower connects the recycle gas import of hotblast stove.
Further, the pneumatic outlet of described sack cleaner also connects blow-off valve.
Further, between described transformation storehouse and feed hopper, be connected with pressure equalizing pipe, on pressure equalizing pipe, have pressure-balanced valve.
Further, on described low pressure storehouse and the pipeline between transformation storehouse and the pipeline between transformation storehouse and feed hopper, be provided with pneumatic ball valve.
The present invention also provides a kind of mill coal drying and carrying method, it is characterized in that, adopts above-mentioned a kind of mill coal drying and e Foerderanlage, and concrete steps are:
Raw coal in run coal bin is sent in predrying device and is dried after feeding machine metering, dried raw coal is fully ground in coal pulverizer, the wind powder mixture that grinds gained carries out separation in sound state separator, the isolated underproof coal dust of sound state separator returns to coal pulverizer to be continued to mill, the isolated gas of sound state separator and qualified coal dust and the gas producing through predrying device and coal dust intermixture enter sack cleaner and complete most gas solid separation, isolated coal dust passes through low pressure storehouse successively, after transformation storehouse and feed hopper, enter gasification nozzle, isolated gas major part is returned to hotblast stove circulating-heating by recirculation blower, small part is by blow-off valve emptying, with the water-content in regulation system, air in hotblast stove and the fuel combustion gas producing and the nitrogen that comes from nitrogen distributor are mixed to regulate oxygen amount and the temperature of hot blast in mixing tank, mixed hot blast is divided into two-way, wherein a road enters predrying device for dry raw coal, and another road enters coal pulverizer for dry coal dust, nitrogen in nitrogen distributor is delivered to sack cleaner as the blowback air of sack cleaner and inertia protection gas, the nitrogen in nitrogen distributor is delivered to low pressure storehouse, transformation storehouse and feed hopper respectively as protection gas and pressurising and the fluidizing agent of low pressure storehouse, transformation storehouse and feed hopper.
Compared with prior art, the invention has the beneficial effects as follows:
1. raw coal arranges predrying device before entering coal pulverizer, and the former moisture content of coal that enters coal pulverizer reduces, and the drying capacity of pulverized coal preparation system increases substantially, and the reduction of moisture has improved the calorific value of coal, thereby is conducive to burning and the gasification of coal dust, improves gasification efficiency;
2. owing to adopting warm air drying and sound state separator is set in coal mill system, coal powder size regulation range is large; By warm air drying, can be dried the coal of high-moisture, coal dust moisture significantly reduces, and is conducive to the conveying of coal dust, hot blast before entering coal pulverizer with nitrogen mixture control oxygen level, the security that is conducive to improve system;
3. utilize the nitrogen in nitrogen distributor to protect gas as blowback air and the inertia of sack cleaner, nitrogen, simultaneously as protection gas and pressurising and the fluidizing agent of low pressure storehouse, transformation storehouse and feed hopper, has effectively guaranteed the safety and reliability of whole mill coal drying and delivery system; Can carry out pressurising and fluidisation to fine coal, be conducive to the conveying of fine coal, prevent bridge formation and the compacting of fine coal in course of conveying simultaneously;
4. the gas of the gas producing through predrying device and coal dust intermixture and coal pulverizer outlet and the mixture of coal dust all enter sack cleaner and carry out gas solid separation, gas returns to hotblast stove recycle through recirculation blower, whole system is the negative-pressure sealed system of self-circulation, without dust and coal dust, escape, environmental friendliness, security of system performance is good.
Accompanying drawing explanation
Fig. 1 is mill coal drying of the present invention and e Foerderanlage schematic diagram.
Embodiment
For the present invention is become apparent, hereby with preferred embodiment, and coordinate accompanying drawing to be described in detail below.
Embodiment
As shown in Figure 1, for mill coal drying of the present invention and e Foerderanlage schematic diagram, described mill coal drying and e Foerderanlage comprise run coal bin, feeding machine, hotblast stove, nitrogen distributor, recirculation blower, mixing tank, predrying device, coal pulverizer, sound state separator, fly-ash separator, low pressure storehouse, transformation storehouse, feed hopper and gasification nozzle, run coal bin outlet is connected with the import of feeding machine by pipeline, the outlet of feeding machine is connected with the coal dust import of predrying device by pipeline, the discharge of predrying device is connected with the opening for feed of coal pulverizer by pipeline, on coal pulverizer, be provided with sound state separator, sound state separator has qualified discharge and defective discharge, defective discharge connects coal pulverizer, qualified discharge connects the coal dust import of sack cleaner by pipeline, the meal outlet of sack cleaner connects the import in low pressure storehouse, the outlet in low pressure storehouse connects the import in transformation storehouse by pipeline, the outlet in transformation storehouse connects the import of feed hopper by pipeline, the outlet of feed hopper connects gasification nozzle by pipeline, on hotblast stove, be provided with air intlet and fuel inlet and recycle gas import, the outlet of hotblast stove connects the first import of mixing tank, the second import of mixing tank connects nitrogen distributor, the first hot-blast outlet of mixing tank is connected with predrying device by pipeline, the second hot-blast outlet is connected with the gas feed of coal pulverizer by pipeline, nitrogen distributor also connects sack cleaner, low pressure storehouse, transformation storehouse and feed hopper, the pneumatic outlet of predrying device connects sack cleaner, the pneumatic outlet of sack cleaner connects blow-off valve and recirculation blower, the outlet of recirculation blower connects the recycle gas import of hotblast stove, between described transformation storehouse and feed hopper, be connected with pressure equalizing pipe, on pressure equalizing pipe, there is pressure-balanced valve.On described low pressure storehouse and the pipeline between transformation storehouse and the pipeline between transformation storehouse and feed hopper, be provided with pneumatic ball valve.
Adopt said apparatus, the concrete steps of carrying out mill coal drying and conveying are:
Raw coal in run coal bin is sent in predrying device and is dried after feeding machine metering, dried raw coal is fully ground in coal pulverizer, the wind powder mixture that grinds gained carries out separation in sound state separator, the isolated underproof coal dust of sound state separator returns to coal pulverizer to be continued to mill, the isolated gas of sound state separator and qualified coal dust and the gas producing through predrying device and coal dust intermixture enter sack cleaner and complete most gas solid separation, isolated coal dust enters low pressure storehouse, in low pressure storehouse, coal dust enters transformation storehouse by pipeline, in transformation storehouse, fine coal enters feed hopper by pipeline, in feed hopper, fine coal enters gasification nozzle by pipeline, the isolated gas major part of sack cleaner is returned to hotblast stove circulating-heating by recirculation blower, small part is carried out moisture content in adjustments of gas by blow-off valve emptying, air in hotblast stove and the fuel combustion gas producing and the nitrogen that comes from nitrogen distributor are mixed to regulate oxygen amount and temperature in mixing tank, mixed hot blast is divided into two-way, wherein a road enters predrying device for dry raw coal, hot blast fully contacts in predrying device with raw coal realizes the dry of raw coal, and another road enters coal pulverizer for dry coal dust, nitrogen in nitrogen distributor is delivered to sack cleaner as the blowback air of sack cleaner and inertia protection gas, the nitrogen in nitrogen distributor is delivered to low pressure storehouse, transformation storehouse and feed hopper respectively as protection gas and pressurising and the fluidizing agent of low pressure storehouse, transformation storehouse and feed hopper.
Claims (4)
1. a mill coal drying and e Foerderanlage, it is characterized in that, comprise run coal bin, feeding machine, hotblast stove, nitrogen distributor, recirculation blower, mixing tank, predrying device, coal pulverizer, sound state separator, sack cleaner, low pressure storehouse, transformation storehouse, feed hopper and gasification nozzle, run coal bin outlet is connected with the import of feeding machine by pipeline, the outlet of feeding machine is connected with the coal dust import of predrying device by pipeline, the discharge of predrying device is connected with the opening for feed of coal pulverizer by pipeline, on coal pulverizer, be provided with sound state separator, sound state separator has qualified discharge and defective discharge, defective discharge connects coal pulverizer, qualified discharge connects the coal dust import of sack cleaner by pipeline, the meal outlet of sack cleaner connects the import in low pressure storehouse, the outlet in low pressure storehouse connects the import in transformation storehouse by pipeline, the outlet in transformation storehouse connects the import of feed hopper by pipeline, the outlet of feed hopper connects gasification nozzle by pipeline, on hotblast stove, be provided with air intlet and fuel inlet and recycle gas import, the outlet of hotblast stove connects the first import of mixing tank, the second import of mixing tank connects nitrogen distributor, the first hot-blast outlet of mixing tank is connected with predrying device by pipeline, the second hot-blast outlet is connected with the gas feed of coal pulverizer by pipeline, nitrogen distributor also connects sack cleaner, low pressure storehouse, transformation storehouse and feed hopper, the pneumatic outlet of predrying device connects sack cleaner, the pneumatic outlet of sack cleaner connects recirculation blower, the outlet of recirculation blower connects the recycle gas import of hotblast stove, the pneumatic outlet of described sack cleaner also connects blow-off valve.
2. mill coal drying as claimed in claim 1 and e Foerderanlage, is characterized in that, between described transformation storehouse and feed hopper, is connected with pressure equalizing pipe, has pressure-balanced valve on pressure equalizing pipe.
3. mill coal drying as claimed in claim 1 and e Foerderanlage, is characterized in that, on described low pressure storehouse and the pipeline between transformation storehouse and the pipeline between transformation storehouse and feed hopper, is provided with pneumatic ball valve.
4. a mill coal drying and carrying method, it is characterized in that, adopt a kind of mill coal drying claimed in claim 1 and e Foerderanlage, concrete steps are: the raw coal in run coal bin is sent in predrying device and is dried after feeding machine metering, dried raw coal is fully ground in coal pulverizer, the wind powder mixture that grinds gained carries out separation in sound state separator, the isolated underproof coal dust of sound state separator returns to coal pulverizer to be continued to mill, the isolated gas of sound state separator and qualified coal dust and the gas producing through predrying device and coal dust intermixture enter sack cleaner and complete most gas solid separation, isolated coal dust passes through low pressure storehouse successively, after transformation storehouse and feed hopper, enter gasification nozzle, isolated gas major part is returned to hotblast stove circulating-heating by recirculation blower, small part is by blow-off valve emptying, with the water-content in regulation system, air in hotblast stove and the fuel combustion gas producing and the nitrogen that comes from nitrogen distributor are mixed to regulate oxygen amount and the temperature of hot blast in mixing tank, mixed hot blast is divided into two-way, wherein a road enters predrying device for dry raw coal, and another road enters coal pulverizer for dry coal dust, nitrogen in nitrogen distributor is delivered to sack cleaner as blowback air and the inertia protection gas of sack cleaner, the nitrogen in nitrogen distributor is delivered to low pressure storehouse, transformation storehouse and feed hopper as protection gas and pressurising and the fluidizing agent of low pressure storehouse, transformation storehouse and feed hopper.
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| CN103816987B (en) * | 2013-12-09 | 2015-10-14 | 国家电网公司 | A kind of computational methods of double inlet and outlet coal mill powder outlet quantity |
| CN105567335B (en) * | 2014-10-13 | 2018-06-29 | 彭万旺 | A kind of coal dust pressure treatment method |
| CN104498102B (en) * | 2014-12-26 | 2016-09-14 | 富阳鸿祥技术服务有限公司 | A kind of coal gasification method |
| CN104498096B (en) * | 2014-12-26 | 2016-08-17 | 张哲夫 | A kind of coal gasification method |
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| CN113025389A (en) * | 2021-03-05 | 2021-06-25 | 韩乐 | Raw coal treatment equipment and method for treating raw coal by using same |
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Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102007020332A1 (en) * | 2007-04-30 | 2008-11-06 | Siemens Ag | Use of a mixture of carbon dioxide and nitrogen as an inerting and conveying medium in Staubeintragsystemen for pulverized coal gasification |
| CN101532678B (en) * | 2009-03-02 | 2014-05-07 | 章礼道 | Brown gas (oxyhydrogen gas) ignition system of coal burning boiler of power plant |
| CN101761933B (en) * | 2010-01-15 | 2011-06-15 | 西安热工研究院有限公司 | Low-temperature furnace smoke sucking exhaust gas and hot air drying composite powder feeding bituminous coal and meagre coal universal type powder preparing system |
| CN102889609B (en) * | 2011-07-20 | 2016-03-16 | 上海援梦电力能源科技咨询中心 | Smoke drying steel ball brown-coal milling system |
| CN102433142B (en) * | 2011-10-21 | 2013-09-25 | 山东天力干燥股份有限公司 | Quality-improving technique combining low-rank coal pneumatic drying with multi-tube revolving dry distillation and system for same |
| CN102633123A (en) * | 2012-05-03 | 2012-08-15 | 东南大学 | Gear pump for conveying dry powder in transforming way |
| CN102671740B (en) * | 2012-05-07 | 2013-12-18 | 章礼道 | Intelligent roller type medium speed coal mill |
| CN203229496U (en) * | 2013-02-18 | 2013-10-09 | 上海锅炉厂有限公司 | Milled coal drying and conveying device applicable to high-moisture-content coal |
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