CN105985790A - Coal treatment system and coal treatment method - Google Patents
Coal treatment system and coal treatment method Download PDFInfo
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- CN105985790A CN105985790A CN201610238328.6A CN201610238328A CN105985790A CN 105985790 A CN105985790 A CN 105985790A CN 201610238328 A CN201610238328 A CN 201610238328A CN 105985790 A CN105985790 A CN 105985790A
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- 239000003245 coal Substances 0.000 title claims abstract description 205
- 238000000034 method Methods 0.000 title claims abstract description 88
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 27
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- 238000004519 manufacturing process Methods 0.000 claims abstract description 25
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- 239000000446 fuel Substances 0.000 claims description 26
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- 238000003672 processing method Methods 0.000 claims description 19
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- 239000011280 coal tar Substances 0.000 description 9
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- 229910002092 carbon dioxide Inorganic materials 0.000 description 5
- 239000000779 smoke Substances 0.000 description 5
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- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical group [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
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- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
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- 229910001021 Ferroalloy Inorganic materials 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
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- 239000011285 coke tar Substances 0.000 description 1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B53/00—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form
- C10B53/04—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form of powdered coal
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B47/00—Destructive distillation of solid carbonaceous materials with indirect heating, e.g. by external combustion
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B57/00—Other carbonising or coking processes; Features of destructive distillation processes in general
- C10B57/08—Non-mechanical pretreatment of the charge, e.g. desulfurization
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L1/00—Liquid carbonaceous fuels
- C10L1/32—Liquid carbonaceous fuels consisting of coal-oil suspensions or aqueous emulsions or oil emulsions
- C10L1/326—Coal-water suspensions
Abstract
The invention provides a coal treatment system which comprises a semicoke production line and a coproduct production line, wherein the semicoke production line comprises a coal transmission device, a coal pulverizer, a steam preconditioning device, an external-heating retort device and a semicoke cooler which are sequentially arranged; the coproduct production line comprises a byproduct separation device, a coal water slurry preparation device and a gas storage device which are sequentially arranged downstream the external-heating type retort device; the coal water slurry preparation device and the gas storage device are arranged downstream the byproduct separation device in parallel. According to the coal treatment system and coal treatment method, tar and hydrogen-rich retort gas produced by coal retorting are subjected to graded utilization: the tar and hydrogen-rich retort gas are independently sold, or further separated and refined for producing fuel oil products, phenols, naphthalene and hydrogen; and the obtained clean low-sulfur semicoke is sent to the boiler to be combusted for power generation. The system and method obviously enhance the economic benefit of the thermal power plant, and the waste flue gas and retort wastewater generated by retorting are subjected to an innovative integrated treatment method, so that the environment-friendly up-to-standard emission of the whole power plant is ensured.
Description
Technical field
The present invention relates to electricity power industry, more specifically, it relates to a kind of coal treatment system to coal cascade utilization and coal processing method.
Background technology
At present, the primary energy occurrence condition of China's " rich coal, oil starvation, few gas " will determine within considerably long period in future, and the coal principal status of public economy in energy resource structure will not change, and be the basic energy resource that can rely on for a long time of China.Coal in China quality is the most poor, and low-order coal resource accounts for about the 55% of coal resources total amount, has become as the important component part of China's production of energy and supply.China supports the coal production accounting for Century Square 0% with the coal reserves of 12% at present, supports the fast development of economy, and therefore, the high effect cleaning of low-order coal resource develops has great strategic importance.
Brown coal are the typical low-order coal of a kind of brownish black between peat and pitch coal.Reserves 130,000,000,000 tons is verified by China, accounts for about the 13% of whole nation coal gross reserves, separately has brown coal prognostic resources 190,300,000,000 tons.At present, the brown coal more than 90% that China develops the most on a small quantity are near coal-mine generating.Brown coal cost of electricity-generating is cheap, is the 1/3～1/4 of black coal cost of electricity-generating, natural gas 1/6～1/7.But brown coal have that moisture is big, caloric value is low, chemism is high, the inflammable feature such as frangible, high water content brown coal be directly used in generating have that CO2 emissions are big, power plant's plant construction and the series of problems such as operating cost is high, additionally, China's brown coal are substantially distributed in the remote field such as Inner Mongol, northeast, Yunnan, away from economic development center, economically underdeveloped area, coal, electricity demand are less, and substantial amounts of brown coal need to be maneuvered into distant developed area.With Qinhuangdao as reference point, the brown coal of Hailar Area are about 190 yuan/ton to the cost of transportation at harbour, and country has limited the transportation radius of low heat value coal, and start the power supply base projects such as Xilin Hot, concentrate the electric energy conversion carrying out the brown coal place of production, and propose to need to use brown coal water lift technology, strive for the target of power plant zero water consumption, it is ensured that the Economic Sustainability sexual development of water-deficient area.Along with the adjusting and optimizing of national energy structure, bituminous coal and rationally seeming with effectively utilization of the thermal power plant with low-order coal such as brown coal as fuel are become more and more important and highlights, China's strategy of sustainable development and energy-saving and emission-reduction are also of great immediate significance.
Meanwhile, along with the fast development of Chinese national economy, oil consumption increases rapidly.Anticipated the year two thousand twenty China's oil demand about 6.5 hundred million tons, yield 200,000,000 tons, breach 4.5 hundred million tons, external dependence degree will reach 60%, exert heavy pressures on Chinese energy safety.On the one hand to walk out and oil-producing country develops petroleum resources cooperatively, the resource it is also contemplated that base on our country, oil supply problem is solved with Chinese wisdom, except Development of Coal directly or indirectly liquefies in addition to the petroleum replacing product such as liquefaction, coal alcohol-ether fuel, utilization accounts for the low-order coal such as the brown coal of coal resources in China reserves more than 13%, utilizes the chemical reactivity that brown coal are high, by the extraction coal tar of low temperature distillation low cost, it is processed further making clear gusoline, is also the important channel solving oil shortage.
The dry distillation of coal (coal carbonization) is one of significant process of Coal Chemical Industry.Refer to that coal heats under isolation air conditions, decomposes, generate the process of the products such as coke (or semicoke), coal tar, coal gas, crude benzol.By the difference of heating final temperature, three kinds: 900～1100 DEG C can be divided into for high-temperature retorting, i.e. coking；700～900 DEG C is medium temperature carbonization；500～600 DEG C is low temperature distillation.Coal carbonization is belonging to chemical change.Low-order coal many employings low temperature distillation upgradings such as popular smokeless coal uses ripe high-temperature retorting to produce coke and town gas, brown coal, can obtain the tar of high yield, semicoke and coal gas.Coal tar hydrogenating can produce alternative to oil and the petroleum cokes such as gasoline, diesel oil, residual oil；Low-sulfur semicoke is high-quality cleaning smokeless fuel, also can be gasification raw material and the adsorbing material of high-quality as industry, domestic fuel and carbide, ferroalloy, blast furnace blowing material；Coal gas is cleaning fuel and the unstripped gas of inhibition and generation work synthesis gas, it is achieved the high added value conversion of coal.Therefore the low-order coal dry distilling such as brown coal belongs to the clean coal technology of the comprehensive cascade utilization of coal, dry distilling processing can make fat coal and the low-order coal that quality is low, purposes is narrow obtain multiple use product widely, improve economic benefit and the energy utilization efficiency of low-order coal, comply fully with China and develop clean coal technology the strategy of energy diversification.In being planned by National Development and Reform Committee's " planning of coal deep processing demonstrative project " and Modern Coal-based Chemical 12, low-order coal upgrading is put into one of 7 big great demonstrative projects, and the object of planning to 2015 year grasps the extensive complete set technologys such as 1,000,000 tons of low-order coal upgradings substantially.Visible, coal low temperature distillation upgrading technology, by having good economic benefit and environment social benefit, have a extensive future.
In the world, the country such as Australia, the U.S., Russia, Germany, Poland, Indonesia suffers from the low-order coal resources such as the brown coal that enrich, in order to improve quality and the economic worth of brown coal, has carried out the research work of long-term brown coal retorting technique.The lignite resource of China is also the abundantest, at present, such as China Datang Power Group Corporation, China Shenhua Group company, China Hua'neng Group Co. etc., is all actively developing construction and the early stage research on utilization of brown coal dry distilling upgrading engineering project.Typical brown coal distillation process has: Gu the L-R technique of Germany, the Lurgi-Spuelgas low temperature distillation technique of Germany, the fluid bed-quick distillation process of heat carrier low temperature of the U.S., the TOSCOAL coal carbonization technology of the U.S., the quick distillation process of fluid bed of Australia, the multistage rotary furnace technique of coal academy of sciences MRF, the solid thermal carriers new distillation process technique of Dalian University of Science & Engineering and Shenhua of China modularity hot solid carrier devolatilization technique.Coal dry distilling upgrading technology is in experimental study and through engineering approaches original application stage mostly the most both at home and abroad, it is extremely complex to there is process system in major part technology, unit treating capacity is little, floor space is big, investment height, and energy consumption is higher, tar yield is the highest, wastewater treatment capacity is big, has the shortcomings such as bigger pollution to environment, does not meets the requirement of China's energy-saving and emission-reduction.Therefore, development system is simple and reliable, the dry distillation of coal upgrading technology of high-efficiency low-pollution, reduced investment, and realizes the engineering mimoir application of scale as early as possible, is the overall development trend of coal upgrading comprehensive utilization technique, also will have the strongest Technical Economy.
At present in coal carbonization upgrading research process focus be coal tar productivity.Because the liquid fuel of coal tar the most still high-quality, and it is some special chemical preparations and the raw material of new chemical materials.Have in the world at present more than 95% 2～4 cyclophane perfumeries and heterocyclic compound and 15%～25% BTX be difficult to obtain from oil from coal tar (including crude benzol), the most most aromatic substance monomer.In order to improve coal tar yield and quality, the most carry out substantial amounts of research work.Next two of which process will be introduced.
1, the quick distillation process of coal
The quick distillation process of coal is different from the traditional retorting technique for the purpose of obtaining coke, it is to take off the most rapidly the part fugitive constituent in coal under normal pressure and medium temperature condition, obtain coal tar as much as possible, simultaneously by-product solid semicoke and the raw gas of high heating value.Different according to heating medium, the quick dry distilling of coal dust can be divided into gas heat carrier technique and solid thermal carriers technique.
Gas heat carrier technique: gas heat carrier technique is typically the high-temperature gas produced after char Gasification or burning is introduced dry distilling room, difference according to mode of heating is divided into external-heat (high-temperature gas heats coal indirectly) and internal heat type (high-temperature gas directly heats coal) two kinds, and representative processes has the multistage fluidized bed COED technique of the Japanese quick distillation process of air flow bed fine coal and the U.S..The both technique strong adaptability to coal, overall thermal efficiency is high, and Japan's quick distillation process of air flow bed fine coal, owing to dry distilling and gasification reaction are concentrated on the different phase in same reactor, has saved space, make compact equipment, but pressurized conditions needs additional equipment and cost.The distinguishing feature of the multistage fluidized bed COED technique of the U.S. is grading dry distillation and negative pressure operation, reduce the degree of dry distilling product secondary response, dry distilling product and semicoke to the full extent and crosslink the degree of reaction, but the difficulty that excessively complicated flow process also makes technique amplify increases, and the stable operation of whole system needs to take into account the factors such as the discharge of temperature, pressure, fluidized state and semicoke, and the difficulty of real-world operation operation requires the highest.Have at home: the national wealth stove of Guo electricity Futong；Three river SJ retorting techniques；The LCC technique that Datang China silver improves；Xi'an thermal technology institute fluid bed, the brown coal low temperature distillation modification technology of Anshan heat energy institute；The brown coal modification upgrading technology that Beijing Collins reaches；Chinese coal scientific research Zong Yuan Beijing coalification institute multistage rotary furnace distillation process (MRF) is carrying out brown coal dry distilling applied research by gas heat carrier technology again.
Solid thermal carriers technique: solid thermal carriers technique then utilizes high-temperature semi-coke or other high-temp solid material to mix in dry distilling room with coal, utilize the sensible heat of heat carrier by the dry distillation of coal, representational have Garrett technique, TOSCOAL technique, LR technique and the DG technique of Dalian University of Science & Engineering exploitation, for solid thermal carriers coal carbonization technology, carry out substantial amounts of research work both at home and abroad, and major part has been carried out type approval test, but there is no commercialization so far, main reason is that the semicoke (Ceramic Balls) etc. of solid thermal carriers is required to extra fuel combustion to its heat supply, the thermal efficiency of whole process is relatively low, additionally there are the problems such as solid product value is low, the most substantially stopped research.Development and the requirement of coal comprehensive utilization along with Combustion technology of circulating fluidized, solid thermal carriers coal carbonization technology based on CFBC, the units such as the Cranfield university of Britain, Zhejiang University, Jinan Boiler Plant, process institute of the Chinese Academy of Sciences, Shanxi coalification institute of the Chinese Academy of Sciences in succession develop and as solid thermal carriers, fire coal carry out stokehold dry distilling using cycling hot ash and produce coal gas and tar, semicoke after dry distilling is used as to burn to produce steam-electric power and heat supply in stove sent into by boiler oil, it is achieved heat, electricity, oil, the multi-production process of gas.These techniques need not special heat carrier firing equipment and are achieved with stable high-temperature heat carrier source, and Pyrolysis Char is directly used in the burning of recirculating fluidized bed, takes full advantage of the sensible heat of semicoke, and the heat utilization efficiency of whole system is high；The Pyrolysis Char diluted by heat carrier directly returns boiler combustion without separating, thus overcomes the problem that conventional solid heat carrier distillation process solid product value is low；In terms of pollutant removing, owing to the part sulfur-bearing nitrogen-containing compound in coal is enriched with removing in retort process, recirculating fluidized bed desulfurization removing nitric load is significantly reduced, but in terms of industrialization, still suffer from a lot of problem, main reason is that and process development has commonly encountered some technical problems, such as semicoke (or Ceramic Balls) and the foldback etc. of ash after solid material mixing, the purification of dust-laden carbonization gas and dry distilling, hinder the further exploitation of this technique.
The technique of aforementioned two kinds of quick dry distilling is compared by following table.
| Technique | Advantage | Shortcoming | Efficiency, environmental protection |
| Internal-heating gas heat carrier | Technique is simple, invests low | Calorific value of gas is low, purifies complexity | Environmental protection investments are big, and the thermal efficiency is low |
| External-heat gas heat carrier | Wastewater treatment capacity is few, and the thermal efficiency is high, and oil product, gas quality are high | Invest slightly higher | Environmental protection, efficiently |
| Burnt solid circle heat carrier | Gas quality is high | Dust Capacity is big, and oil yield is low | Environmental protection, efficiency are slightly lower |
| Ash cycling hot solid carrier | Gas quality is high, the thermal efficiency is high | Need supporting CFBB | Environmental protection, energy-conservation |
2, coal hydrogenation dry distilling
Coal hydrogenation dry distilling is to carry out, by outer hydrogenation, the free radical that the saturated dry distillation of coal produces, it is to avoid between free radical, mutually polymerization occurs secondary response, makes free radical be combined generation tar light oil with hydrogen.The major advantage of this technique is to significantly improve tar yield (reaching more than 30%) and quality of coke tar (increasing the content of light components in tar), it is often more important that it has the most significant desulfurization removing nitric effect.But coal hydrogenation dry distilling needs hydrogen manufacturing and hydrogen circulation device to make its cost and investment cost higher, it is difficult to compete, so this technique remains in pilot scale level so far with petrochemical industry.For solving coal hydrogenation dry distilling cost and investment cost problem, people begin look for cheap hydrogen-rich atmosphere and replace pure hydrogen to carry out coal hydrogenation dry distilling, and researcher successively proposes the new technologies such as " dry distilling altogether of the quick methane of coal ", " dry distilling altogether of coke furnace coal gas ", " CO2 reforms and couples (CRMP) with the dry distillation of coal "." the quick methane of coal distillation process altogether " operation pressure is low, and in tar, ethylene, benzene and tar light oil yield are high." coke furnace coal gas distillation process altogether " retorted product yield is suitable with hydrotoring product yield under suitable hydrogen pressure, and product slates depends on the hydrogen dividing potential drop in oven gas.The productivity of " methane CO2 reform couple (CRMP) technique with the dry distillation of coal " process tar reaches 27%, is under the same terms in nitrogen atmosphere 2.8 times of dry distilling, in nitrogen atmosphere 1.7 times of dry distilling.Additionally, Zhang Xiaofang etc. utilize the mixed gas simulation carbonization gas of N2, H2, CO, CO2 and CH4, tar (empyreumatic oil) productivity of Study on Coal dry distilling in carbonization reactor is with the Changing Pattern of various constituent contents above-mentioned in reaction atmosphere, finding to use carbonization gas maximum as tar yield during reaction atmosphere, relative moisture-and-ash-free basis coal reaches 13%.Up to the present above-mentioned technique there is no industrialization report.
In sum, at present, domestic and international dry distillation of coal cascade utilization generally exists that plant investment is high, environmental protection pressure big, tar and the low problem having much room for improvement of gas products quality, there is no the commercially useful execution example that thermal power plant is combined with dry distillation of coal technology at present.
Summary of the invention
Present invention aim at providing a kind of can the coal treatment system of sub-prime cascade utilization coal.
The object of the invention is again to provide a kind of coal processing method applying aforementioned coal treatment system to carry out sub-prime cascade utilization coal.
According to an aspect of the present invention, it is provided that a kind of coal treatment system, comprising: semicoke production line, it coal transmitting device including being sequentially arranged, coal powder crushing device, the pre-modifying device of steam, external-heat destructive distillation device, Semi-coke cooling device；Byproduct production line, it side-product segregation apparatus, water-coal-slurry slurring device and caisson of including being sequentially arranged in described external-heat destructive distillation device downstream；Wherein, described water-coal-slurry slurring device and described caisson are arranged in parallel at described side-product segregation apparatus downstream.
Alternatively, arranging returning charge transmitting device after described external-heat destructive distillation device, described returning charge transmitting device carrys out heat supply for a part of uncooled hot semicoke is transmitted back to described external-heat destructive distillation device.
Alternatively, also include the condensed water transmitting device of the condensed water transmission extremely described Semi-coke cooling device produced in pre-for described steam modifying device；And/or the vapor transmission device by the vapor transmission of generation in described Semi-coke cooling device to the pre-modifying device of described steam.
Alternatively, the flue gas processing device being connected to described external-heat dry distiller is also included.
Alternatively, also include being arranged in the sack cleaner in described steam pre-modifying device downstream, booster fan and Water Sproading unit, the water vapour that the pre-modifying device of described steam produces is after described sack cleaner purifies, and a part of water vapour returns in the pre-modifying device of described steam via the bottom of the pre-modifying device of described steam via described booster fan；And/or another part transmission of water vapor is to Water Sproading unit.
Alternatively, also including the double fuel burner that carbonization gas and/or dry pulverized coal can be used as fuel, it is for providing high-temperature flue gas for described external-heat destructive distillation device.
Alternatively, the pre-modifying device of described superheated steam be provided with monolayer built-in skew heat exchanger indirectly add vapours fluid bed or tubular type rotary dryer.
Alternatively, the described built-in high-temperature tubular heat exchanger of external-heat destructive distillation device.
Alternatively, the built-in vapor heat exchanger of the pre-modifying device of described steam.
Alternatively, described side-product segregation apparatus includes: sintering Ceramic dust collector and/or metal filtration separator；And cooler.
According to another aspect of the present invention, also provide for a kind of coal processing method, comprising: S100, by coal transmitting device, coal transmission is pulverized coal to coal powder crushing device, produce coal dust；S200, transmits coal dust to the pre-modifying device of steam, and the processed first pre-quenched period in the superheated steam at the first pre-quenched temperature, produces dehydration coal dust and condensed water；S300, by carrying out dry distilling in dehydration coal dust transmission to external-heat destructive distillation device, produces semicoke and side-product；S400, cools down semicoke transmission to Semi-coke cooling device.
Alternatively, the described side-product in S300 includes: coke powder and/or dry distillation gas and/or tar steam and/or water of constitution steam.
Alternatively, also include after S300: S510, coke powder is isolated via side-product segregation apparatus, and transmit to water-coal-slurry slurring device to produce water-coal-slurry；And/or S520, dry distillation gas is isolated via side-product segregation apparatus, and after desulfurization cools down, transmits it to caisson and store；And/or for transmission to double fuel burner is burnt, to provide high-temperature flue gas heat exchange for described external-heat destructive distillation device；And/or it is transmitted back in external-heat destructive distillation device loosen coal dust layer；And/or S530, by tar steam via side-product segregation apparatus separating-purifying；And/or S540, water of constitution steam is isolated via side-product segregation apparatus, and transmits to water-coal-slurry slurring device to produce water-coal-slurry.
Alternatively, S410, a part is transmitted back to described external-heat destructive distillation device heat supply without overcooled semicoke by returning charge transmitting device.
Alternatively, S200 also includes: to described Semi-coke cooling device, the condensed water produced in pre-for described steam modifying device is cooled down semicoke by the transmission of condensed water transmitting device；And/or S400 also includes: the steam produced in described Semi-coke cooling device is carried out heat supply by the transmission of vapor transmission device to the pre-modifying device of described steam.
Alternatively, also include after S400: S600, the semicoke transmission after cooling is stored to coal yard for burning and/or transmission to boiler.
Alternatively, also include after S200: S700, the water vapour produced by pre-for described steam modifying device is after sack cleaner purifies, make a part of water vapour be returned in the pre-modifying device of described steam via the bottom of the pre-modifying device of described steam by booster fan, loosen the coal dust layer of the pre-quenched bottom of device of described steam；And/or make another part transmission of water vapor to Water Sproading unit.
Alternatively, also including after S700: S800, the coal dust produced by pre-for described steam modifying device, after sack cleaner purifies, is sent in double fuel burner and is burnt, and to provide high-temperature flue gas heat exchange for described external-heat destructive distillation device.
Alternatively, also include after S800: S900, by with described external-heat destructive distillation device heat exchange after middle temperature flue gas carry out out of stock and desulfurization via flue gas processing device and process.
Alternatively, the first pre-refining temperature in S200 is 105 ~ 495 ° of C；And/or first the pre-quenched period be 0.1-10 hour.
Alternatively, the material layer temperature of the brown coal granule in the pre-modifying device of described steam is 105 DEG C-495 DEG C, and the coal dust moisture wet basis after the pre-modifying device of described steam processes is 0.2%-67%.
Coal treatment system according to the present invention and coal processing method, there is provided a kind of low temperature distillation technology that external-heat Jiao circulated to be applied to the efficient sub-prime in thermal power plant and utilize, the clean low-sulfur semicoke produced for generating electricity, high yield tar is as the coal clean conversion technique of side-product export trade.Which employs external-heat gas heat carrier technology and the Integration ofTechnology of solid Jiao circulation, use the circulation of hydrogen-rich carbonizing gas, it is proposed that one integrates physical separation and thermochemical study simultaneously, generate oil, gas, the efficient upgrading of coal of semicoke utilize process simultaneously.The method is also the effective fuel pretreatment measure of a kind of thermal power plant ultra-clean discharge transformation.Carry out dry distilling in advance by all or part of power coal that heat power plant boiler is burnt to process, by-product cascade utilization, improve profit from power plant.In the method, tar and the hydrogen-rich carbonization gas of coal dry distilling output are graded utilization: sell separately or further separation and purification is for producing fuel oil, phenol, naphthalene and hydrogen；The clean low-sulfur semicoke obtained sends to boiler combustion generating.Significantly improved the economic benefit in thermal power plant by the method while, useless flue gas produced by dry distilling and the dry distilling waste water integrated method of disposal by innovation, it is ensured that the environment protection emission of whole power plant is up to standard.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of an embodiment of the coal treatment system of the present invention.
Detailed description of the invention
As shown in Figure 1, the present invention is further detailed explanation with specific embodiment below in conjunction with the accompanying drawings, is not that the practical range of the present invention is confined to this.The coal treatment system of the present embodiment mainly includes semicoke production line and byproduct production line.Coal transmitting device 1 that wherein semicoke production line includes being sequentially arranged, coal powder crushing device 2, the pre-modifying device of steam 3, external-heat destructive distillation device 4, Semi-coke cooling device 8；And byproduct production line includes being sequentially arranged in the side-product segregation apparatus in external-heat destructive distillation device 4 downstream, water-coal-slurry slurring device 11 and caisson 13.
Now, first the raw coal in coal yard is transmitted to coal powder crushing device 2 by coal transmitting device 1 and pulverize.Coal powder size after broken is between 0.01 ~ 25mm, and it is sent in the pre-modifying device of steam 3.Built-in vapor heat exchanger in steam pre-conditioners 3, by heating indirectly, it is ensured that coal dust can process about 0.1-10 hour in the superheated steam environment of 105 ~ 495 DEG C.This can significantly improve oil productivity, the moisture in coal of abjection major part simultaneously, hence it is evident that reduce the chemical combination wastewater flow rate that dry distilling produces to part coal, alleviates the pressure that system waste water processes.As a kind of detailed description of the invention, the pre-modifying device of steam 3 adds vapours fluid bed or tubular type rotary dryer indirectly for be provided with monolayer built-in skew heat exchanger.Alternatively, after steam pre-modifying device 3 processes, low-rank coal moisture content on wet basis is 0.2%-67%.As a kind of detailed description of the invention, in the pre-modifying device of steam 3, the material layer temperature of brown coal granule is 105 DEG C-495 DEG C.As another kind of detailed description of the invention, the heat exchanger in the pre-modifying device of steam 3 is built-in unidirectional straight tubular heat exchanger.Wherein steam pre-conditioners 3 moisture in isolated coal discharge with steam form, moisture can be reclaimed by heat exchanger, reclaim heat therein simultaneously.
Through steam pre-quenched after hot coal pruinescence deliver in external-heat destructive distillation device 4, at this by external-heat retorting technique and the technical combinations of burnt circulation, at the built-in high-temperature tubular heat exchanger of external-heat destructive distillation device 4, add and hot gas hot type destructive distillation device 4 outside is walked tube side and dry distilling feed coal mediate contact, obtain the carbonization gas that calorific value is high.
The mixed gas of the carbonization gas, product vapour, water of constitution steam and the semicoke fine powder that produce in external-heat destructive distillation device 4 is discharged from dry distiller top, it is sent to sinter Ceramic dust collector 6 or metal filtration separator, semicoke fine powder therein is separated with dry distilling mixed gas, the mixed vapour of carbonization gas, product vapour and water of constitution enters refrigerated separation in cooler 7, obtains room temperature carbonization gas, coalite tar and water of constitution.The wherein canned rear entrucking export trade of coalite tar, it is temporary wherein that room temperature carbonizing gas is admitted to caisson 13 by roots blower 12.Alternatively, a part for stored hydrogen-rich gas is recycled external-heat destructive distillation device 4, and playing in loosening external-heat destructive distillation device 4 while pulverized coal particle, in external-heat destructive distillation device 4, high hydrogen partial pressure is also beneficial to tar yield and must improve.
The semicoke fine powder system separated passes through water-coal-slurry slurring device 11, make water-coal-slurry, pumped by simple pipeline, the torch oil gun system utilizing original thermal power plant is sent into boiler of power plant burning, the environmental issue that the thorough ultra-fine semicoke dust pollution solving distillation process and the change of high pollution and waste water process, and process mature and reliable, utilizing existing facility, transformation and operating cost are low.It is appreciated that the various sintering pottery or metal filtration separator 6 and cooler 7 can be unified to regard byproduct for treatment device as, its side-product being used to producing in production semicoke processes.
By 400 ~ 650 DEG C of semicoke granules discharged bottom external-heat destructive distillation device 4 after ensureing that the rotatory feeder valve sealed is admitted to be cooled to ambient temperature in Semi-coke cooling device 8, according to production scheduling requirement, directly can send into boiler of power plant by the tubular belt 9,10 sealed and burn or send coal yard coal blending use back to.
Alternatively, returning charge transmitting device 5 can be set after external-heat destructive distillation device 4, the most cooled hot semicoke can be sent back in external-heat destructive distillation device 4 by this returning charge transmitting device, the most quickly heating raw coal with the built-in heat exchanger of external-heat destructive distillation device 4, this combination can reach higher dry distilling coal dust programming rate such that it is able to realize higher oil productivity and device capbility.
Alternatively, this coal treatment system also includes being transmitted by the condensed water produced in pre-for steam modifying device 3 to the condensed water transmitting device of Semi-coke cooling device 8 and by the vapor transmission device of the vapor transmission of generation in Semi-coke cooling device 8 to the pre-modifying device of steam 3.In which case, on the one hand, Semi-coke cooling device 8 reclaims the cooling heat of major part semicoke by built-in heat exchanger, and produces steam and deliver to recycle in the pre-modifying device of steam 3, and recirculated cooling water is by ensure to be cooled to semicoke granule can be with the near ambient temperature of safe transport.On the other hand, the condensed water produced in the pre-modifying device of steam 3 cools down semicoke by the transmission of condensed water transmitting device to Semi-coke cooling device 8, it is also possible to effectively reclaims the heat in condensed water, improves capacity usage ratio.
Alternatively, this coal treatment system also includes being arranged in the sack cleaner 17 in steam pre-modifying device 3 downstream, booster fan 18 and Water Sproading unit.The produced water vapour of water evaporation in coal produced by the pre-modifying device of steam 3 is discharged by top, through sack cleaner 17, purify rear portion and send into Water Sproading unit, a part is through steam boosting blower fan 18, entered by bottom the pre-modifying device of steam 3 after supercharging, play loosening coal seam, it is ensured that the effect of heat exchange efficiency, recycle.
Alternatively, this coal treatment system also includes the double fuel burner 14 that carbonization gas and/or dry pulverized coal can be used as fuel, and it is for providing high-temperature flue gas for external-heat destructive distillation device 4.In which case, on the one hand, produced cold carbonization gas in caisson 13 can be delivered to burn in double fuel burner 14, in the pipe of the built-in heat exchanger that the high-temperature flue gas of the 500-850 ° of C of high temperature produced enters external-heat destructive distillation device 4, by high-temperature tubular heat exchanger tube wall, the heat required for dry distilling is passed to the pulverized coal particle outside pipe.On the other hand, the coal dust produced in the pre-modifying device of steam 3, after sack cleaner 17 purifies, is admitted in double fuel burner 14 burning, provides high-temperature flue gas heat exchange for external-heat destructive distillation device 4.As an example, double fuel burner is to use carbonization gas and/or dry pulverized coal as the combustion gas furnace of fuel.
Alternatively, this coal treatment system also includes the flue gas processing device being connected to external-heat destructive distillation device 4.The flue gas system of dry distiller is divided into high temperature and middle low temperature two sections, middle temperature denitration unit 15 it is integrated with two sections of centres, go middle low-temperature zone heat exchange again after the middle temperature smoke denitrating that heating system produces, deliver to the main air and gas system of power plant by pipeline through smoke induced draught fan 16, after desulfurization, concentrate qualified discharge.It is appreciated that middle temperature denitration unit 15 and smoke induced draught fan 16 can be unified to regard flue gas processing device as, it is used to process the flue gas of heat supply in production semicoke.
Meanwhile, for can the preferably technique effect of the coal treatment system of previous embodiment at performance, according to another aspect of the present invention, also provide for a kind of coal processing method.This method will be further described as follows in conjunction with Fig. 1.Comprising: S100, by coal transmitting device 1, coal transmission is pulverized coal to coal transmitting device 2, produce coal dust；S200, transmits coal dust to the pre-modifying device of steam 3, and the processed first pre-quenched period in the superheated steam at the first pre-quenched temperature, produces dehydration coal dust and condensed water；S300, by carrying out dry distilling in dehydration coal dust transmission to external-heat destructive distillation device 4, produces semicoke and side-product；S400, cools down semicoke transmission to Semi-coke cooling device 8.
Additionally, for optimizing aforementioned coal processing method, also provide for more alternative embodiment.
Alternatively, the side-product in S300 includes: coke powder and/or dry distillation gas and/or tar steam and/or water of constitution steam.
Alternatively, also include after S300: S510, coke powder is isolated via side-product segregation apparatus, and transmit to water-coal-slurry slurring device 11 to produce water-coal-slurry；And/or S520, dry distillation gas is isolated via side-product segregation apparatus, and after desulfurization cools down, transmits it to caisson 13 and store；And/or for transmission to double fuel burner 14 is burnt, provide high-temperature flue gas heat exchange for external-heat destructive distillation device 4；And/or it is transmitted back in external-heat destructive distillation device 4 loosen coal dust layer；And/or S530, by tar steam via side-product segregation apparatus separating-purifying；And/or S540, water of constitution steam is isolated via side-product segregation apparatus, and transmits to water-coal-slurry slurring device 11 to produce water-coal-slurry.
Alternatively, S410, hot semicoke the most cooled for a part is transmitted back to external-heat destructive distillation device 4 heat supply by returning charge transmitting device 5.
Alternatively, S200 also includes: to Semi-coke cooling device 8, the condensed water produced in pre-for steam modifying device 3 is cooled down semicoke by the transmission of condensed water transmitting device；And/or S400 also includes: the steam produced in Semi-coke cooling device 8 is carried out heat supply by the transmission of vapor transmission device to the pre-modifying device of steam 3.
Alternatively, also include after S400: S600, the semicoke transmission after cooling is stored to coal yard for burning and/or transmission to boiler.
Alternatively, also include after S200: S700, the water vapour produced by pre-for steam modifying device is after sack cleaner 17 purifies, make a part of water vapour be returned in the pre-modifying device of steam 3 via the bottom of the pre-modifying device of steam by booster fan 18, loosen the coal dust layer bottom the pre-modifying device of steam 3；And/or make another part transmission of water vapor to Water Sproading unit.
Alternatively, also including after S700: S800, the coal dust produced by pre-for steam modifying device 3, after sack cleaner 17 purifies, is sent in double fuel burner 14 and is burnt, provide high-temperature flue gas heat exchange for external-heat destructive distillation device 4.
Alternatively, also include after S800: S900, by with external-heat destructive distillation device 4 heat exchange after middle temperature flue gas carry out out of stock and desulfurization via flue gas processing device and process.
Alternatively, the first pre-refining temperature in S200 is 105 ~ 495 ° of C；And/or first the pre-quenched period be 0.1-10 hour.
Alternatively, the material layer temperature of the brown coal granule in the pre-modifying device of steam is 105 DEG C-495 DEG C, and the coal dust moisture wet basis after the pre-modifying device of steam processes is 0.2%-67%.
Low temperature distillation technique proposed by the invention discharge ultra-clean with thermal power plant transformation combines new system and method, various oil products and the gas raw material of the high added value contained in producing coal can be efficiently separated before combustion, farthest excavate the intrinsic economy of low-rank coal resource, environmental and social benefits, it it is the effective realistic approach conscientiously improving coal utilization efficiency, coal extracting liq gaseous fuel, is also beneficial to the guarantee of national energy security strategy.As a example by the 300MW thermal power plant of current traditional combustion low-order coal, annual about 1,100,000 tons calorific values of fuel consumption are 3500Kcal/Kg, water content is the low-order coal of 33%, if using the low temperature distillation technology that this method proposes, the annual coalite tar by the high added value reclaiming more than 60,000 tons more, 5,000 ten thousand standard cubic meter calorific value about 5000Kcal/m3High-purity dry distillation gas, there is also about 200,000 tons of water, substantially can realize power plant zero water consumption target；And the semicoke after dry distilling process, calorific value improves about 40%, sulfur content reduces about 25%, belong to clean coal, significantly reduce coal consumption, carbon dioxide and SO2 emissions, be conducive to the requirement making existing thermal power plant reach the ultra-clean discharge transformation that country is recently proposed, can significantly improve utilization ratio and the economy of power plant benefit of coal.
This method proposes the solution of low temperature distillation core process and tradition thermal power plant seamless connection, simple and reliable, safety and environmental protection, efficient energy-saving, technique main to existing power plant need not do large-scale redevelopment, make full use of original soil and facility, invest low, benefit is obvious.Technique power plant is integrated has the advantage that for this
Safety: parallel operation, does not affect main defeated coal unit, easy switching, it is ensured that main electricity generation system safe operation；Distillation system uses external-heat technology, and the raw coal kind suitability is strong, retort process be respectively adopted superheated steam and purified after coal gas be working media, closed-loop operation, is an oxygen-free process, and coal dust free burning and explosion danger, security of system is reliable.
Environmental protection: the nitrogen oxides of the dry distilling waste gas of system and complete up to standard process of sulfur dioxide are discharged, by the built-in flue gas of dry distiller middle temperature denitration unit, after after adding heat smoke denitration up to standard, (or entering independent desulfurization unit) delivers to power plant's main air and gas system desulfurization unit desulfurization together with main flue gas qualified discharge；The ultra-fine semi-coke powder that the dry distilling phenol wastewater of system produces with dry distilling together makes water-coal-slurry, utilizes the oil-firing system of original boiler all to send into boiler combustion.Slurrying and pipeline conveying are the most airtight, and contamination-free abnormal flavour leaks, and avoids dust pollution and the pollution of chemical combination waste water of superfine powder, it is ensured that the clear production environment of whole system simultaneously.
Potentiation: dry distillation of coal product cascade utilization, accepts ability and the market situation of by-product according to the industrial platform of periphery, and carbonization gas can be outer defeated by pipeline, it is also possible in system, thermal source is done in burning；Coalite tar produces high-quality fuel oil and fine chemical product as major product export trade for deep processing；Semicoke all send boiler combustion to generate electricity, the Coal at Low Temperature dry distilling utilizing this method carries out coproduction with boiler of power plant combustion power generation, power plant can be effectively utilized to accept resource, according to network load fluctuation regulation coproduction by-product production capacity, economic benefit can be increased substantially, with traditional 300MW steam power plant measuring and calculating, after using this method to process the power raw coal of 50%, the income from sales of power plant can improve about 20%.
Energy-conservation: boiler of power plant commonly fire coal calorific value after dry distilling improves about 25-55%, and wherein the content of organic sulfur can reduce about 30-55%, and moisture is reduced to about 1-3%, belong to high-quality high heating value, low-sulfur low water cleaning thermal coal, can significantly improve combustion conditions, reduce coal pulverizer, smoke induced draught fan power consumption and desulfurization unit load, thus reduce gross coal consumption rate about 4-15
g/Kw.h；And the moisture separated in coal by steam regulation of texture, conditioning of texture pretreatment is system of discharging in vapour form, by heating boiler feed water, remove steam air heater or Winter heat supply, also can substantially reduce gross coal consumption rate about 2-8
g/Kw.h；Cascaded utilization of energy, by the waste heat recovery byproduct steam of hot coke powder, for raw coal dehydration and steam regulation of texture, conditioning of texture, improves the heat utilization efficiency of whole distillation system.
Water saving: by the process of the pre-modifying device of steam, the most of moisture in coal can be isolated, by waste heat recovery or air cooling technique, the moisture in coal is recycled, supplement boiler water consumption after delivering to desulfurization unit or processing, can substantially reduce power plant water consumption, particularly important in water-deficient area, it is environmentally friendly and water resource economizing type clean coal technology.
Efficient: core distillation process uses the technological innovation of fine breeze external-heat coke powder circulation, destructive distillation device heat transfer efficiency and coal dust heating rate are higher than conventional internally heated retort oven, and device efficiency is high, production capacity big (annual production of single cover system can reach more than 500,000 tons), floor space is little, equipment investment is low；The quenched oil productivity about 15-30% that can be effectively improved specific low order coal of indirect steam the most in advance, simultaneously with containing a large amount of H2Heating gas be the loosening medium of coal dust, H in dry distiller2Existence be also beneficial to tar and separate out, thus improve the whole economic efficiency of distillation system.
External-heat Jiao is circulated low temperature distillation technology and is applied to thermal power plant efficient upgrading utilization, define and there is production low-sulfur semicoke, the brown coal clean conversion technique of high tar yield, can safe efficient in thermal power plant, comprehensively utilize to environmental protection the low-order coal resource of China's abundant.
In describing the invention, it will be appreciated that, on " ", D score, "front", "rear", the orientation of the instruction such as "left", "right" or position relationship be based on orientation shown in the drawings or position relationship, it is for only for ease of the description present invention and simplifies description, rather than instruction or hint indication device or feature must have specific orientation, with specific azimuth configuration and operation, be therefore not considered as limiting the invention.
Example above primarily illustrates coal processing means and the coal processing method of the present invention.Although being only described some of them embodiments of the present invention, but those of ordinary skill in the art are it is to be appreciated that the present invention can be implementing with other forms many with in scope without departing from its spirit.Therefore, the example shown and embodiment are considered illustrative and not restrictive, and in the case of without departing from spirit and scope of the present invention as defined in appended claims, the present invention may contain various amendments and replacement.
Claims (21)
1. a coal treatment system, it is characterised in that including:
Semicoke production line, it coal transmitting device including being sequentially arranged, coal powder crushing device, the pre-modifying device of steam, external-heat destructive distillation device, Semi-coke cooling device；
Byproduct production line, it side-product segregation apparatus, water-coal-slurry slurring device and caisson of including being sequentially arranged in described external-heat destructive distillation device downstream；
Wherein, described water-coal-slurry slurring device and described caisson are arranged in parallel at described side-product segregation apparatus downstream.
Coal treatment system the most according to claim 1, it is characterised in that arrange returning charge transmitting device after described external-heat destructive distillation device, described returning charge transmitting device carrys out heat supply for hot semicoke the most cooled for a part is transmitted back to described external-heat destructive distillation device.
Coal treatment system the most according to claim 1, it is characterised in that also include the condensed water transmitting device of the condensed water transmission extremely described Semi-coke cooling device produced in pre-for described steam modifying device；And/or the vapor transmission device by the vapor transmission of generation in described Semi-coke cooling device to the pre-modifying device of described steam.
Coal treatment system the most according to claim 1, it is characterised in that also include the flue gas processing device being connected to described external-heat dry distiller.
Coal treatment system the most according to claim 1, it is characterized in that, also include being arranged in the sack cleaner in described steam pre-modifying device downstream, booster fan and Water Sproading unit, the water vapour that the pre-modifying device of described steam produces is after described sack cleaner purifies, and a part of water vapour returns in the pre-modifying device of described steam via the bottom of the pre-modifying device of described steam via described booster fan；And/or another part transmission of water vapor is to Water Sproading unit.
Coal treatment system the most according to claim 1, it is characterised in that also include the double fuel burner that carbonization gas and/or dry pulverized coal can be used as fuel, it is for providing high-temperature flue gas for described external-heat destructive distillation device.
7. according to the coal treatment system described in claim 1 to 6 any one, it is characterised in that the pre-modifying device of described superheated steam be provided with monolayer built-in skew heat exchanger indirectly add vapours fluid bed or tubular type rotary dryer.
8. according to the coal treatment system described in claim 1 to 6 any one, it is characterised in that the described built-in high-temperature tubular heat exchanger of external-heat destructive distillation device.
9. according to the coal treatment system described in claim 1 to 6 any one, it is characterised in that the built-in vapor heat exchanger of the pre-modifying device of described steam.
10. according to the coal treatment system described in claim 1 to 6 any one, it is characterised in that described side-product segregation apparatus includes: sintering Ceramic dust collector and/or metal filtration separator；And cooler.
11. 1 kinds of coal processing methods, it is characterised in that including:
S100, pulverizes coal by coal transmission to coal powder crushing device by coal transmitting device, produces coal dust；
S200, transmits coal dust to the pre-modifying device of steam, and the processed first pre-quenched period in the superheated steam at the first pre-quenched temperature, produces dehydration coal dust and condensed water；
S300, by carrying out dry distilling in dehydration coal dust transmission to external-heat destructive distillation device, produces semicoke and side-product；
S400, cools down semicoke transmission to Semi-coke cooling device.
12. coal processing methods according to claim 11, it is characterised in that the described side-product in S300 includes: coke powder and/or dry distillation gas and/or tar steam and/or water of constitution steam.
13. coal processing methods according to claim 12, it is characterised in that also include after S300:
S510, isolates coke powder via side-product segregation apparatus, and transmits to water-coal-slurry slurring device to produce water-coal-slurry；And/or
S520, isolates dry distillation gas via side-product segregation apparatus, and after desulfurization cools down, transmits it to caisson and store；And/or for transmission to double fuel burner is burnt, to provide high-temperature flue gas heat exchange for described external-heat destructive distillation device；And/or it is transmitted back in external-heat destructive distillation device loosen coal dust layer；And/or
S530, by tar steam via side-product segregation apparatus separating-purifying；And/or
S540, isolates water of constitution steam via side-product segregation apparatus, and transmits to water-coal-slurry slurring device to produce water-coal-slurry.
14. coal processing methods according to claim 11, it is characterised in that also include:
S410, is transmitted back to described external-heat destructive distillation device heat supply by hot semicoke the most cooled for a part by returning charge transmitting device.
15. coal processing methods according to claim 11, it is characterised in that:
S200 also includes: to described Semi-coke cooling device, the condensed water produced in pre-for described steam modifying device is cooled down semicoke by the transmission of condensed water transmitting device；And/or
S400 also includes: to the pre-modifying device of described steam, the steam produced in described Semi-coke cooling device is come heat supply by the transmission of vapor transmission device.
16. coal processing methods according to claim 11, it is characterised in that also include after S400:
S600, stores the semicoke transmission after cooling to coal yard for burning and/or transmission to boiler.
17. coal processing methods according to claim 11, it is characterised in that also include after S200:
S700, the water vapour produced by pre-for described steam modifying device is after sack cleaner purifies, make a part of water vapour be returned in the pre-modifying device of described steam via the bottom of the pre-modifying device of described steam by booster fan, loosen the coal dust layer of the pre-quenched bottom of device of described steam；And/or make another part transmission of water vapor to Water Sproading unit.
18. coal processing methods according to claim 17, it is characterised in that also include after S700:
S800, the coal dust produced by pre-for described steam modifying device, after sack cleaner purifies, is sent in double fuel burner and is burnt, and to provide high-temperature flue gas heat exchange for described external-heat destructive distillation device.
19. coal processing methods according to claim 18, it is characterised in that also include after S800:
S900, by with described external-heat destructive distillation device heat exchange after middle temperature flue gas carry out out of stock and desulfurization via flue gas processing device and process.
20. coal processing methods according to claim 11, it is characterised in that the first pre-refining temperature in S200 is 105 ~ 495 ° of C；And/or first the pre-quenched period be 0.1-10 hour.
21. coal processing methods according to claim 11, it is characterised in that the material layer temperature of the brown coal granule in the pre-modifying device of described steam is 105 DEG C-495 DEG C, the coal dust moisture wet basis after the pre-modifying device of described steam processes is 0.2%-67%.
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| CN107746719A (en) * | 2017-11-07 | 2018-03-02 | 中国矿业大学(北京) | The new technology that a kind of low-order coal sub-prime utilizes |
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