CN111748395A - Method for preparing coal powder by using coal slime - Google Patents
Method for preparing coal powder by using coal slime Download PDFInfo
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- CN111748395A CN111748395A CN202010632613.2A CN202010632613A CN111748395A CN 111748395 A CN111748395 A CN 111748395A CN 202010632613 A CN202010632613 A CN 202010632613A CN 111748395 A CN111748395 A CN 111748395A
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- coal
- coal slime
- slime
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- 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
- C10L9/00—Treating solid fuels to improve their combustion
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- 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
- C10L9/00—Treating solid fuels to improve their combustion
- C10L9/10—Treating solid fuels to improve their combustion by using additives
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- Solid Fuels And Fuel-Associated Substances (AREA)
Abstract
The invention discloses a method for preparing coal powder from coal slime. The method comprises the following steps: 1) quantitatively conveying the coal slime into a drying and scattering kiln, and conveying raw coal and limestone into a crusher through a vibration feeder; 2) the crushed raw coal, limestone and dry coal slime are metered by an electronic belt scale and then are uniformly fed into a pre-grinding bin and then are sent into a coal grinding machine for drying and grinding; 3) finished coal dust discharged by the explosion-proof cloth bag dust collector enters a powder storage bin, and then the coal dust in the bin is loaded and transported by a ton bag packing machine or a bulk machine. The coal slime is the hydrous coal slime of a coal washing plant, has low cost, and simultaneously realizes the high-efficiency treatment of the coal slime, so that the coal slime is maximally utilized.
Description
Technical Field
The invention relates to a process method for preparing coal dust from coal slime, belonging to the technical field of solid waste recycling and coal dust preparation.
Background
Currently, the annual output of coal slime associated with raw coal washing in China is about 2 hundred million tons, and most coal washing plants stack the coal slime in the open air due to the high direct utilization difficulty, so that the huge waste of coal resources is caused, and the ecological environment is polluted. The coal slime has high water content, high viscosity, high water holding capacity, high ash content and low heat value, so that the effective treatment of the coal slime is difficult. The characteristic that the particle size of coal slime particles is small is utilized, the coal slime is coupled with the process of preparing coal powder by washing clean coal, and the coal powder prepared by the coal slime is used as the coal powder which can be used for boiler combustion, so that an effective way for utilizing the coal slime is provided.
The patent of publication No. CN106987297A discloses a coal slime fine powder preparation system and a process thereof, wherein the process adopts negative-pressure normal-temperature air flow to dry the water on the surface of coal slime particles, so that the purposes of low drying cost and low fuel consumption are achieved, but the problems of unsatisfactory drying effect and low wet coal slime treatment capacity exist.
The patent publication No. CN104492587A discloses that a coal slime filter cake is prepared from coal slime of an aerospace furnace and is burnt in a circulating fluidized bed boiler as fuel to realize recycling of the coal slime, but the method needs a large amount of water for spraying the coal ash in the preparation process of the coal slime filter cake, and brings a complicated water pollution problem.
The patent of publication No. CN106047426A discloses a method for preparing low-ash and low-sulfur coal water slurry by using coal slurry deep flotation to firstly obtain low-sulfur and low-ash flotation clean coal and then preparing the low-ash and low-sulfur coal water slurry by using the low-sulfur and low-ash flotation clean coal.
Disclosure of Invention
The invention aims to provide a preparation method for recycling solid wastes to prepare high-efficiency clean environment-friendly fuel for a high-efficiency pulverized coal industrial boiler, and organic unification of economic benefits, environment-friendly benefits and social benefits is realized.
The method for preparing the coal powder comprises the following steps:
1) respectively feeding raw coal and limestone into a crusher through a vibrating feeder to be dried and crushed, respectively storing the raw coal and the limestone in a coal bunker and an auxiliary material bunker after being measured by an electronic belt scale, and respectively marking the raw coal a and the limestone a;
drying and scattering the coal slime, and storing the coal slime in a coal slime powder bin, and marking as coal slime a;
spiral scales are arranged below the coal bunker, the auxiliary material bunker and the coal slime powder bunker for feeding and metering;
2) mixing and caching the raw coal a, the limestone a and the coal slime a in a pre-grinding bin, then sequentially entering a drying rotary kiln and a vertical mill for drying and grinding, then collecting by an explosion-proof cloth bag dust collector, and obtaining finished coal powder in a finished product bin;
the vertical mill is carried out in a coal mill;
the drying rotary kiln is carried out in a drying scattering kiln;
the heat sources of the drying rotary kiln and the vertical mill are provided by a hot air system;
the hot air system consists of a blower, a pulverized coal tower and a pulverized coal hot air furnace;
and air inlet pipelines of the drying rotary kiln, the vertical mill and the vertical mill are all connected with a nitrogen supplementing pipe for inert protection.
In the step 1) of the method, the feeding mass of the coal slime, the raw coal and the limestone is 10-45: 10-45: 1; specifically, 24: 25: 1;
the particle sizes of the raw coal a, the limestone a and the coal slime a are not more than 30 mm;
in the drying step, the moisture content of the dried material is not more than 5%.
In the step 2), the coal powder hot-blast stove is a full-automatic low-nitrogen coal powder hot-blast stove; the fuel is finished coal powder made by the system;
the method further comprises the following steps: and (3) purifying the hot flue gas used for drying the vertical mill in the step 2) by using flue gas.
The flue gas purification mode is various common flue gas purification modes; such as flue gas purification by a hot blast stove.
The explosion-proof clothOnline monitoring equipment, inert gas protection and CO are arranged at inlet and outlet of bag dust collector2A fire suppression system;
the on-line monitoring equipment is selected from at least one of oxygen content monitoring, temperature monitoring, CO concentration monitoring and dust concentration monitoring.
The upper and lower positions of the finished product bin are provided with online monitoring equipment, inert gas protection and CO2A fire suppression system;
the on-line monitoring equipment is selected from at least one of oxygen content monitoring, temperature monitoring, CO concentration monitoring and dust concentration monitoring.
All interfaces of all the equipment in the step 1) and the step 2) operate under the condition of full-closed full negative pressure.
The coal slime is specifically aqueous coal slime of a coal washing plant; the water content is 30-55%; more particularly 40-45%.
The invention solves the problems of coal slime accumulation, ineffective treatment and serious pollution; the coal slime can be changed into valuable after being processed and prepared by proportioning according to a certain proportion, and the SO generated during the combustion of the finished coal powder can be simultaneously generated by adding limestone2Conversion of gas to CaSO4Solid, effectively plays a role in sulfur fixation and reduces SO in fuel combustion flue gas2Discharging to make the prepared finished coal powder become a high-efficiency clean environment-friendly fuel; the hot air system is provided with a full-automatic low-nitrogen pulverized coal burner, and the flue gas is purified, so that the environmental protection requirement can be met; the system is additionally provided with security means such as nitrogen protection, dust monitoring and the like, so that the safety of the whole system is further enhanced; it has the characteristics of energy conservation, environmental protection, high efficiency and safety.
Drawings
FIG. 1 is a schematic process flow diagram of the present invention.
Detailed Description
The present invention will be further illustrated with reference to the following specific examples, but the present invention is not limited to the following examples. The method is a conventional method unless otherwise specified. The starting materials are commercially available from the open literature unless otherwise specified.
Examples 1,
As shown in FIG. 1, the method for preparing coal dust from coal slime provided by the invention comprises the following steps:
1) raw material proportioning and feeding:
quantitatively conveying coal slime with water content of 40-45% in a coal washery into a drying and scattering kiln by using a spiral scale for drying and scattering, and storing dried coal slime powder in a coal slime powder bin by using a bag dust collector and marking as coal slime a;
respectively feeding raw coal and limestone of Shendong coal into a crusher through a vibrating feeder to be dried and crushed, uniformly feeding the crushed material into a coal bin and an auxiliary material bin after the crushed material is measured by an electronic belt scale, and respectively marking as raw coal a and limestone a;
spiral scales are arranged below the coal bunker, the auxiliary material bunker and the coal slime powder bunker for feeding and metering, the proportion of three materials can be strictly controlled, and the aims of high solid waste coal slime consumption and high heat value of finished coal powder are achieved;
the feeding quality of the coal slime, the raw coal and the limestone is 24: 25: 1; the proportion can control the sulfur fixation effect of the finished coal powder to be optimal during combustion, thereby reducing SO in the boiler flue gas2And SO in flue gas of hot blast stove in the system2Discharging of (3);
the particle sizes of the raw coal a, the limestone a and the coal slime a are not more than 30 mm;
in the drying step, the moisture content of the dried material is not more than 5%.
2) Drying and grinding: the raw coal a, the limestone a and the coal slime a are metered by an electronic belt scale and then uniformly fed into a pre-grinding bin for mixing and caching, then the raw coal a, the limestone a and the coal slime a enter a drying rotary kiln, the obtained hot flue gas at 300 ℃ enters a vertical mill for drying and grinding, then the hot flue gas is collected by an explosion-proof cloth bag dust collector, and finished coal powder is obtained in a finished product bin;
the vertical mill is carried out in a coal mill;
the drying rotary kiln is carried out in a drying scattering kiln;
the heat sources of the drying rotary kiln and the vertical mill are provided by a hot air system; hot flue gas used by the drying rotary kiln and the vertical mill is subjected to flue gas purification through a hot blast stove, and the special emission limit requirement of boiler pollutants in key areas of boiler atmospheric pollutant emission standard (GB13271-2014) is completely met;
the hot air system consists of a blower, a pulverized coal tower and a full-automatic low-nitrogen pulverized coal hot air furnace; the low-nitrogen hot blast stove is simultaneously used as a heat source for drying and scattering the coal slime, so that the water content of the dried and scattered coal slime powder is lower than 12 percent, the independent heat source supply for the coal slime drying and scattering machine is avoided, and the multi-way utilization of hot flue gas of the hot blast stove is realized; the fuel is finished pulverized coal which is self-made by the system, so that the whole system is convenient and simple, and has both energy-saving and environment-friendly effects;
air inlet pipelines of the drying rotary kiln, the vertical mill and the vertical mill are all connected with a nitrogen supplementing pipe for inert protection; meanwhile, the low-oxygen exhaust gas discharged by the draught fan of the system is circularly led back to be mixed with hot flue gas provided by a hot air system for air distribution, so that the limit oxygen content of the whole system is controlled within 12%, the fuel consumption of the hot air furnace is reduced, the flue gas discharge of the hot air system is reduced, and the nitrogen supplement amount is reduced, thereby greatly improving the safety, stability, economy, energy conservation and emission reduction effects of the system.
3) Storage and transportation of finished coal powder:
finished coal powder collected by the explosion-proof cloth bag dust collector is conveyed into a finished product bin, and the coal powder in the bin is conveyed and distributed by a ton bag packing machine or a bulk machine, so that the diversity of conveying modes is improved, and the ton bag distribution and the distribution can be carried out by a tank car.
The inlet and the outlet of the explosion-proof dust collector are provided with online monitoring equipment for oxygen content monitoring, temperature monitoring, CO concentration monitoring, dust concentration monitoring and the like, and are provided with inert gas protection and CO2The fire extinguishing system is all automatically interlocked, the monitoring item exceeds a preset numerical value, the fire extinguishing system automatically alarms and automatically starts the inert protection and fire extinguishing system, and the safety of the whole system is effectively protected in an all-round way.
The upper and lower positions of the finished product bin are provided with oxygen content monitoring and temperature monitoring, the top is provided with on-line monitoring equipment such as CO concentration monitoring and the like, and the finished product bin is provided with inert gas protection and CO2The fire extinguishing system automatically alarms and automatically starts the inert protection and fire extinguishing system when the monitoring item exceeds the preset value, and can also operate inert gas and CO by monitoring the value and manually controlling2Injection amount and injection pointThe selection of (2) is more intelligent besides security is guaranteed.
In the steps 1) -3), all interfaces of all equipment are designed to be fully closed, the hot air system, the grinding system, the storage system and the loading system are all operated under full negative pressure, unorganized emission pollution is avoided, the production environment is friendly, and the emission reaches the standard.
According to the invention, a part of hot air generated by the hot-blast stove with low-nitrogen combustion characteristic is used as a heat source for drying and scattering coal slime, so that the coal slime drying efficiency and the hot air utilization rate are obviously improved, the characteristics of good drying effect and high system integration are achieved, efficient combustion and clean zero emission are realized, and the problems of high fuel consumption and high pollutant emission of the hot-blast stove are obviously solved; according to the invention, three traditional coal dust, limestone and coal slime fine powder preparation processes are creatively connected in parallel, and the three are blended to prepare the non-traditional coal dust, so that the coal dust preparation processes and raw materials are broadened, the coal dust combustion characteristic is further improved, and the self-fixing sulfur and coal slime full resource utilization in combustion are realized; the invention creatively arranges the on-line monitoring equipment at the relevant positions of the explosion-proof dust collector, the finished product bin and the like, and is provided with the inert gas protection and fire extinguishing system, thereby ensuring the stable and safe operation of the system. The method has the advantages of mature process flow, high integration and strong practicability.
2 hundred million tons of coal slime are produced in China annually, if 50 percent of the coal slime is used for preparing the coal dust by adopting the method disclosed by the invention, 1 hundred million tons of clean coal can be replaced annually to prepare the coal dust, and if the price of each ton of clean coal is 420 yuan/ton, 420 hundred million yuan can be saved, and SO is reduced2Discharging 800 ten thousand tons. The coal slime resource market demand is large, the method for preparing the coal dust provided by the invention has the outstanding advantages of realizing high-efficiency combustion and net zero emission, and the aim of efficiently treating the coal slime at low cost is fulfilled. Compared with other technologies such as preparing coal water slurry by coal slime, the method has the advantages of small pollution and wide application market.
Claims (8)
1. A method of producing coal fines comprising:
1) respectively feeding raw coal and limestone into a crusher through a vibrating feeder to be dried and crushed, respectively storing the raw coal and the limestone in a coal bunker and an auxiliary material bunker after metering, and respectively marking as raw coal a and limestone a;
drying and scattering the coal slime, and storing the coal slime in a coal slime powder bin, and marking as coal slime a;
spiral scales are arranged below the coal bunker, the auxiliary material bunker and the coal slime powder bunker for feeding and metering;
2) mixing and caching the raw coal a, the limestone a and the coal slime a in a pre-grinding bin, then sequentially entering a drying rotary kiln and a vertical mill for drying and grinding, then collecting by an explosion-proof cloth bag dust collector, and obtaining finished coal powder in a finished product bin;
the vertical mill is carried out in a coal mill;
the drying rotary kiln is carried out in a drying scattering kiln;
the heat sources of the drying rotary kiln and the vertical mill are provided by a hot air system;
the hot air system consists of a blower, a pulverized coal tower and a pulverized coal hot air furnace;
and air inlet pipelines of the drying rotary kiln, the vertical mill and the vertical mill are all connected with a nitrogen supplementing pipe for inert protection.
2. The method of claim 1, wherein: in the step 1), the feeding mass of the coal slime, the raw coal and the limestone is 10-45: 10-45: 1; specifically, 24: 25: 1;
the particle sizes of the raw coal a, the limestone a and the coal slime a are not more than 30 mm;
in the drying step, the moisture content of the dried material is not more than 5%.
3. The method according to claim 1 or 2, characterized in that: in the step 2), the coal powder hot-blast stove is a full-automatic low-nitrogen coal powder hot-blast stove.
4. A method according to any one of claims 1 to 3, wherein: the method further comprises the following steps: and (3) purifying the hot flue gas used for drying the vertical mill in the step 2) by using flue gas.
5. The method according to any one of claims 1 to 4, wherein: the inlet and outlet of the explosion-proof bag dust collector are provided with online monitoring equipment, inert gas protection and CO2A fire suppression system;
the on-line monitoring equipment is selected from at least one of oxygen content monitoring, temperature monitoring, CO concentration monitoring and dust concentration monitoring.
6. The method according to any one of claims 1 to 5, wherein: the upper and lower positions of the finished product bin are provided with online monitoring equipment, inert gas protection and CO2A fire suppression system;
the on-line monitoring equipment is selected from at least one of oxygen content monitoring, temperature monitoring, CO concentration monitoring and dust concentration monitoring.
7. The method according to any one of claims 1 to 6, wherein: all interfaces of all the equipment in the step 1) and the step 2) operate under the condition of full-closed full negative pressure.
8. The method according to any one of claims 1 to 7, wherein: the coal slime is water-containing coal slime of a coal washing plant.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010632613.2A CN111748395A (en) | 2020-07-02 | 2020-07-02 | Method for preparing coal powder by using coal slime |
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| CN202010632613.2A CN111748395A (en) | 2020-07-02 | 2020-07-02 | Method for preparing coal powder by using coal slime |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1122428A (en) * | 1994-11-03 | 1996-05-15 | 吕一君 | Combustion apparatus for coal slime |
| CN101015814A (en) * | 2007-02-08 | 2007-08-15 | 五环科技股份有限公司 | Technique for coal-grinding and drying |
| JP2011092850A (en) * | 2009-10-29 | 2011-05-12 | Ihi Corp | Vertical mill |
| CN103438474A (en) * | 2013-09-12 | 2013-12-11 | 大唐鸡西热电有限责任公司 | Partial-exhaust-gas-participated hot-air powder conveying comprehensive utilization system of boiler pulverizing system |
| CN105953257A (en) * | 2016-05-12 | 2016-09-21 | 内蒙古京泰发电有限责任公司 | Method of large-proportion coal slime blending combustion of circulating fluidized bedboiler |
| CN106642185A (en) * | 2016-11-14 | 2017-05-10 | 北京中矿环保科技股份有限公司 | Process and system for mixed burning of coal slime in big proportion in coal-powder boiler |
| CN106669940A (en) * | 2017-01-11 | 2017-05-17 | 安徽特维工程科技有限公司 | Coal powder preparation process method based on vertical mill |
| CN109181801A (en) * | 2018-10-19 | 2019-01-11 | 内蒙古昕昊环保能源有限责任公司 | A kind of moulded coal raw material and moulded coal |
-
2020
- 2020-07-02 CN CN202010632613.2A patent/CN111748395A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1122428A (en) * | 1994-11-03 | 1996-05-15 | 吕一君 | Combustion apparatus for coal slime |
| CN101015814A (en) * | 2007-02-08 | 2007-08-15 | 五环科技股份有限公司 | Technique for coal-grinding and drying |
| JP2011092850A (en) * | 2009-10-29 | 2011-05-12 | Ihi Corp | Vertical mill |
| CN103438474A (en) * | 2013-09-12 | 2013-12-11 | 大唐鸡西热电有限责任公司 | Partial-exhaust-gas-participated hot-air powder conveying comprehensive utilization system of boiler pulverizing system |
| CN105953257A (en) * | 2016-05-12 | 2016-09-21 | 内蒙古京泰发电有限责任公司 | Method of large-proportion coal slime blending combustion of circulating fluidized bedboiler |
| CN106642185A (en) * | 2016-11-14 | 2017-05-10 | 北京中矿环保科技股份有限公司 | Process and system for mixed burning of coal slime in big proportion in coal-powder boiler |
| CN106669940A (en) * | 2017-01-11 | 2017-05-17 | 安徽特维工程科技有限公司 | Coal powder preparation process method based on vertical mill |
| CN109181801A (en) * | 2018-10-19 | 2019-01-11 | 内蒙古昕昊环保能源有限责任公司 | A kind of moulded coal raw material and moulded coal |
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