CN102759260A - Lignite drying and upgrading system - Google Patents
Lignite drying and upgrading system Download PDFInfo
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- CN102759260A CN102759260A CN2012102410641A CN201210241064A CN102759260A CN 102759260 A CN102759260 A CN 102759260A CN 2012102410641 A CN2012102410641 A CN 2012102410641A CN 201210241064 A CN201210241064 A CN 201210241064A CN 102759260 A CN102759260 A CN 102759260A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention discloses a lignite drying and upgrading system, which comprises a raw coal crushing machine, a raw coal preheater and a drying machine, wherein low-temperature upgraded coals formed by performing heat exchange on high-temperature upgraded coals dried by the drying machine and preliminary raw coals in the raw coal preheater are discharged; a heat pump working medium is compressed by a compressor and conveyed into a heating unit tube bundle of the drying machine; the heat pump working medium dries the preliminary raw coal, and then the preliminary raw coal enters into a waste gas recycling heat exchanger through the heating unit tube bundle and is conveyed into the heating unit tube bundle of the drying machine through the compressor to form a closed cycle; and drying tail gas of the drying machine is fed into the waste gas recycling heat exchanger through a pipeline. By the lignite drying and upgrading system, the energy consumption in the process of drying lignite is reduced by recycling the waste heat; and according to the heat pump theory, the energy of the drying tail gas is recycled for drying the lignite, and the raw coals are preheated by the dried updated coals with relatively high temperature, so that the energy consumption for drying the lignite is effectively reduced.
Description
Technical field
The present invention relates to a kind of coal dust drying system, be specifically related to a kind of brown coal drying system.
Background technology
The proved reserves of China's brown coal account for more than 13% of coal in China gross reserves more than 1,000 hundred million tons, and it is in liberal supply and cheap, will act as a fuel future or the raw material of industry is widely used in thermal power generation and each industrial circle.Yet the high-moisture percentage of brown coal (reaching about 40%) makes that its cost of transportation is high, utilization ratio is low.Employing brown coal drying technology improves its low heat valve, is the effective means that improves the brown coal utilization ratio.But traditional brown coal drying process energy consumption is high.
Main brown coal drying method is an evaporative drying at present, is about to the brown coal heating, makes water evaporates wherein, realizes the drying to brown coal.Because water evaporates needs lot of energy, therefore traditional brown coal drying process is a highly energy-consuming process, and the most of energy that the consumes tail gas that is dried is taken away.Therefore, manage to reclaim the energy that dried tail gas takes away and to reduce the dry run energy consumption effectively.
Summary of the invention
The object of the present invention is to provide and a kind ofly can effectively reduce the brown coal drying energy consumption, be used for brown coal transportation pre-treatment, can improve low heat valve, reduce the brown coal drying and upgrading system of cost of transportation.
For achieving the above object; The technical scheme that the present invention adopts is: comprise raw coal disintegrating machine and the raw coal preheater that links to each other with the raw coal disintegrating machine; Described raw coal preheater links to each other with the feeding mouth of drying machine through pipeline; Send into another inlet of raw coal preheater through transport by the drying machine discharging opening through the dried high temperature upgraded coal of drying machine; In the raw coal preheater, carry out forming the low temperature upgraded coal after the heat exchange with initial raw coal and discharge, heat pump fluid is sent into the heating unit tube bank of drying machine after compressor compresses, and the dry initial raw coal of heat pump fluid gets into waste gas recovery heat exchanger through the back by the heating unit tube bank; Send into the heating unit tube bank formation closed circulation of drying machine again through compressor, the dried tail gas of drying machine also reclaims heat exchanger with waste gas by the road and links to each other.
Described drying machine is the dividing wall type roller drier.
Described drying machine and waste gas reclaim on the pipeline between the heat exchanger deduster are installed, and the gas outlet of deduster is reclaimed heat exchanger with waste gas and linked to each other, and the dust mouth of deduster lower end links to each other with the raw coal transport.
Described drying machine and waste heat recovery heat exchanger between pipeline on choke valve also is installed.
The temperature of described heat pump fluid after the choke valve throttling water saturation temperature corresponding than waste heat recovery heat exchanger pressure hanged down 20 ~ 50 ℃.
The lower end of described waste heat recovery heat exchanger is provided with water pump and water treatment system.
Described drying machine adopts pressurized operation, and the heat pump fluid temperature is high 10 ~ 50 ℃ than the water saturation temperature of the operating pressure correspondence of drying machine.
The temperature of described high temperature upgraded coal behind the raw coal preheater is reduced to than high 5 ~ 15 ℃ of discharges of environment temperature.
The present invention is through reclaiming the energy consumption that used heat reduces the brown coal drying process, and the energy that utilizes heat pump principle to reclaim dried tail gas is used for brown coal drying, utilizes the higher upgraded coal of dry back temperature that raw coal is carried out preheating, thereby reduces the brown coal drying energy consumption effectively.Native system is used for brown coal transportation pre-treatment, can improve low heat valve, reduce cost of transportation; Be used for the preposition drying of brown coal electricity generation system, can improve unit generation efficient.Calculating shows that the preposition drying that this system is used for the brown coal electricity generation system can make system effectiveness improve 4.5% ~ 6.0%, the rate of standard coal consumption 13.0 ~ 17.0g/ (kWh) that descends.
Description of drawings
Fig. 1 is an overall structure sketch map of the present invention.
Among the figure: 1 is that raw coal disintegrating machine, 2 is that raw coal preheater, 3 is that dividing wall type roller drier, 4 is that deduster, 5 is that waste heat recovery heat exchanger, 6 is that water pump, 7 is that water treatment system, 8 is that choke valve, 9 is a compressor.
The specific embodiment
Below in conjunction with accompanying drawing the present invention is done further explain.
Referring to Fig. 1; The raw coal preheater 2 that the present invention includes raw coal disintegrating machine 1 and link to each other with raw coal disintegrating machine 1; Described raw coal preheater 2 links to each other with the feeding mouth of dividing wall type roller drier 3 through pipeline; Send into another inlet of raw coal preheater 2 through transport by discharging opening through dividing wall type roller drier 3 dried high temperature upgraded coal; In raw coal preheater 2, carry out forming the discharge of low temperature upgraded coal after the heat exchange with initial raw coal, heat pump fluid is sent into the heating unit tube bank of dividing wall type roller drier 3 after compressor 9 compresses, and restrains entering waste gas by heating unit behind the dry initial raw coal of heat pump fluid and reclaims heat exchanger 5; Send into the heating unit tube bank formation closed circulation of dividing wall type roller drier 3 again through compressor 9; And on the pipeline between dividing wall type roller drier 3 and the waste heat recovery heat exchanger 5, choke valve 8 is installed also, the gas vent of dividing wall type roller drier 3 reclaims heat exchanger 5 through deduster 4 and waste gas and links to each other, and the dust mouth of deduster lower end links to each other with the raw coal transport.The lower end of waste heat recovery heat exchanger 5 is provided with water pump 6 and water treatment system 7.
The temperature of heat pump fluid of the present invention after the choke valve 8 throttlings water saturation temperature corresponding than waste heat recovery heat exchanger 5 pressure hanged down 20 ~ 50 ℃;
Drying machine 3 adopts pressurized operation, and the heat pump fluid temperature is high 10 ~ 50 ℃ than the water saturation temperature of the operating pressure correspondence of drying machine
The temperature of the high temperature upgraded coal behind raw coal preheater 2 is reduced to than high 5 ~ 15 ℃ of discharges of environment temperature.
Because the mechanical type heat pump is widely used in each industrial circle, it realizes that through consuming a part of mechanical or electrical energy heat energy is from the transmission of low-temperature heat source to high temperature heat source.The present invention utilizes the evaporimeter (waste heat recovery heat exchanger 5) of heat pump to reclaim the energy of dried tail gas; Utilize the condenser (heating unit of dividing wall type roller drier 3) of heat pump that brown coal are carried out drying and upgrading; Realize the coupling of brown coal drying system and heat pump; And utilize the energy of high temperature upgraded coal that raw coal is carried out preheating, further reduce energy consumption for drying, finally form efficient brown coal drying and upgrading system.
Its course of work is: raw coal at first gets in the raw coal disintegrating machine 1 and is crushed to certain particle size; Send into the heat preheating that utilizes the high temperature upgraded coal in the raw coal preheater 2 again; Deliver to then and be dried to a certain degree back formation high temperature upgraded coal in the dividing wall type roller drier 3, cooling forms the output of low temperature upgraded coal in raw coal preheater 2 at last; Dried tail gas is after deduster 4 dedustings, and coal dust reclaims, and clean tail gas is sent into waste heat recovery heat exchanger 5, and heat release is condensed, and incondensable gas is discharged, and condensate gets into water treatment system 7 and handles the back recovery under the effect of water pump 6; The working medium of mechanical type heat pump gets in the heat exchange unit tube bank of dividing wall type roller drier 3 heat release and condenses after compressor 9 boosts, heats up, after choke valve 8 coolings, pressure drop, get into the energy of recovery dried tail gas in the waste heat recovery heat exchanger 5 then.
Adopt the present invention to carry out predrying to the raw coal that certain 600MW directly fires the brown coal electricity generation system; Moisture in the brown coal is reduced to 15.0% by 39.5%; Through calculating; Unit generation efficient can improve 4.5% ~ 6.0%, and unit generation coa consumption rate decline 13.0 ~ 17.0g/ (kWh) has considerable energy saving and reduces discharging benefit.
The present invention makes brown coal dry under steam ambient, and the high temperature upgraded coal can effectively prevent the brown coal spontaneous combustion through the cooling of raw coal preheater, and the security of dry run is good.
Claims (8)
1. brown coal drying and upgrading system; It is characterized in that: comprise raw coal disintegrating machine (1) and the raw coal preheater (2) that links to each other with raw coal disintegrating machine (1); Described raw coal preheater (2) links to each other with the feeding mouth of drying machine (3) through pipeline; Send into another inlet of raw coal preheater (2) through transport by the drying machine discharging opening through the dried high temperature upgraded coal of drying machine (3); In raw coal preheater (2) with after initially raw coal carries out heat exchange, form the discharge of low temperature upgraded coal; Heat pump fluid is sent into the heating unit tube bank of drying machine (3) after compressor (9) compression; The dry initial raw coal of heat pump fluid gets into waste gas through the back by the heating unit tube bank and reclaims heat exchanger (5), and the heating unit tube bank of sending into drying machine (3) through compressor (9) again forms closed circulation, and the dried tail gas of drying machine (3) also links to each other with waste gas recovery heat exchanger (5) by the road.
2. brown coal drying and upgrading according to claim 1 system, it is characterized in that: described drying machine (3) is the dividing wall type roller drier.
3. brown coal drying and upgrading according to claim 1 system; It is characterized in that: described drying machine (3) and waste gas reclaim on the pipeline between the heat exchanger (5) deduster (4) are installed; The gas outlet of deduster is reclaimed heat exchanger (5) with waste gas and is linked to each other, and the dust mouth of deduster lower end links to each other with the raw coal transport.
4. brown coal drying and upgrading according to claim 1 system is characterized in that: described drying machine (3) and waste heat recovery heat exchanger (5) between pipeline on choke valve (8) also is installed.
5. brown coal drying and upgrading according to claim 4 system is characterized in that: the temperature of described heat pump fluid after choke valve (8) throttling is than low 20 ~ 50 ℃ of the corresponding water saturation temperature of waste heat recovery heat exchanger (5) pressure.
6. brown coal drying and upgrading according to claim 1 system, it is characterized in that: the lower end of described waste heat recovery heat exchanger (5) is provided with water pump (6) and water treatment system (7).
7. brown coal drying and upgrading according to claim 1 system is characterized in that: described drying machine (3) adopts pressurized operation, and the heat pump fluid temperature water saturation temperature corresponding than the operating pressure of drying machine is high 10 ~ 50 ℃.
8. brown coal drying and upgrading according to claim 1 system, it is characterized in that: the temperature of described high temperature upgraded coal behind raw coal preheater (2) is reduced to than high 5 ~ 15 ℃ of discharges of environment temperature.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210241064.1A CN102759260B (en) | 2012-07-12 | 2012-07-12 | Lignite drying and upgrading system |
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| CN201210241064.1A CN102759260B (en) | 2012-07-12 | 2012-07-12 | Lignite drying and upgrading system |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103307891A (en) * | 2013-05-27 | 2013-09-18 | 东南大学 | Comprehensive utilization system and method for lignite upgrading and drying energy |
| CN103453747A (en) * | 2013-08-07 | 2013-12-18 | 清华大学 | Rotary coal drying upgrading device with impellers |
| CN103542707A (en) * | 2013-11-18 | 2014-01-29 | 湖南飞来峰非金属矿物材料有限公司 | Fluidized bed combustion boiler waste-heat utilization system of external heated rotary dryer |
| CN105157371A (en) * | 2015-07-13 | 2015-12-16 | 华北电力大学 | Revolving drum type fume-steam integrated raw coal drying equipment |
| CN106705186A (en) * | 2017-02-27 | 2017-05-24 | 西安热工研究院有限公司 | Lignite-based cogeneration system |
| CN109442966A (en) * | 2018-12-25 | 2019-03-08 | 郑州万谷机械股份有限公司 | A kind of heat-pump-type pipe bundle drier |
| CN112779071A (en) * | 2021-01-08 | 2021-05-11 | 中国矿业大学 | Drying and upgrading system for high-water-content coal slime |
| CN114646195A (en) * | 2022-04-03 | 2022-06-21 | 黑龙江省农业科学院土壤肥料与环境资源研究所 | Soil microorganism detects uses earth air dryer |
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| CN102102043A (en) * | 2009-12-17 | 2011-06-22 | 金易通科技（北京）有限公司 | Microwave drying and upgrading method of lignite or coal slime |
| CN102353237A (en) * | 2011-08-18 | 2012-02-15 | 西安交通大学 | High-moisture-content lignite predrying method and system integrated with thermal power plant |
| CN102564084A (en) * | 2012-03-14 | 2012-07-11 | 煤炭工业济南设计研究院有限公司 | Low-temperature waste-heat coal slime drying device |
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Patent Citations (4)
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| WO2003018716A1 (en) * | 2001-08-29 | 2003-03-06 | Generation Technology Research Pty Ltd | Coal dewatering system and method |
| CN102102043A (en) * | 2009-12-17 | 2011-06-22 | 金易通科技（北京）有限公司 | Microwave drying and upgrading method of lignite or coal slime |
| CN102353237A (en) * | 2011-08-18 | 2012-02-15 | 西安交通大学 | High-moisture-content lignite predrying method and system integrated with thermal power plant |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103307891A (en) * | 2013-05-27 | 2013-09-18 | 东南大学 | Comprehensive utilization system and method for lignite upgrading and drying energy |
| CN103453747A (en) * | 2013-08-07 | 2013-12-18 | 清华大学 | Rotary coal drying upgrading device with impellers |
| CN103453747B (en) * | 2013-08-07 | 2016-01-13 | 清华大学 | A kind of impeller rotation-type coal drying and upgrading device |
| CN103542707A (en) * | 2013-11-18 | 2014-01-29 | 湖南飞来峰非金属矿物材料有限公司 | Fluidized bed combustion boiler waste-heat utilization system of external heated rotary dryer |
| CN105157371A (en) * | 2015-07-13 | 2015-12-16 | 华北电力大学 | Revolving drum type fume-steam integrated raw coal drying equipment |
| CN106705186A (en) * | 2017-02-27 | 2017-05-24 | 西安热工研究院有限公司 | Lignite-based cogeneration system |
| CN109442966A (en) * | 2018-12-25 | 2019-03-08 | 郑州万谷机械股份有限公司 | A kind of heat-pump-type pipe bundle drier |
| CN112779071A (en) * | 2021-01-08 | 2021-05-11 | 中国矿业大学 | Drying and upgrading system for high-water-content coal slime |
| CN112779071B (en) * | 2021-01-08 | 2022-08-05 | 中国矿业大学 | Drying and upgrading system for high-water-content coal slime |
| CN114646195A (en) * | 2022-04-03 | 2022-06-21 | 黑龙江省农业科学院土壤肥料与环境资源研究所 | Soil microorganism detects uses earth air dryer |
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| CN102759260B (en) | 2014-07-02 |
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Effective date of registration: 20210106 Address after: 221600 North Side of Xiaohe Road, Peixian Development Zone, Xuzhou City, Jiangsu Province Patentee after: Xuzhou Guolong Electric Power Parts Foundry Co.,Ltd. Address before: 710049 No. 28 West Xianning Road, Shaanxi, Xi'an Patentee before: XI'AN JIAOTONG University |