CN204240389U - Superheat steam drying powder process type coal generating system - Google Patents

Superheat steam drying powder process type coal generating system Download PDF

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CN204240389U
CN204240389U CN201420677551.7U CN201420677551U CN204240389U CN 204240389 U CN204240389 U CN 204240389U CN 201420677551 U CN201420677551 U CN 201420677551U CN 204240389 U CN204240389 U CN 204240389U
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coal
steam
air
powder
exhaust steam
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马有福
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University of Shanghai for Science and Technology
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University of Shanghai for Science and Technology
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00Combustion technologies with mitigation potential
    • Y02E20/34Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery

Abstract

The utility model provides a kind of superheat steam drying powder process type coal generating system, for carrying out burning rear drive electrical power generators to raw coal, comprise: boiler controller system, comprise: powder process subsystem, boiler host subsystem, air-supply powder feeding subsystem and exhaust steam Water Sproading subsystem, and Steam Turbine, wherein, powder process subsystem comprises: vapour powder generates drying device, vapour powder separator, and drier generating apparatus, the exhaust steam heater of drier generating apparatus utilize from steam turbine draw gas thermosetting superheated steam is added to the exhaust steam exhaust steam heater, air preheater carries out heating to a part for environment cold wind and obtains hot blast, a part for hot blast enters air and powder mixer as First air with another part of environment cold wind after First air mixing chamber mixes, another part of hot blast directly sends into coal burner as Secondary Air, coal burner burns to the coal dust in wind powder mixture, coal dust and First air, Secondary Air burns and generates flue gas in burner hearth.

Description

Superheat steam drying powder process type coal generating system
Technical field
The utility model relates to a kind of coal fired power generation field, is specifically related to boiler air-supply, superheat steam drying powder process, moisture in coal recovery technology and utilizes the superheat steam drying powder process type coal generating system of the heat that draws gas of steam turbine.
Background technology
China is the country of the few oily deficency of a rich coal, and coal is in core leading position in China's energy supply always, future quite over a long time in, the energy resource structure based on coal can be sustained in China.Because coal fired power plant has the extensive feature concentrating use coal, be conducive to accomplishing efficient, clean utilization coal, thus coal is mainly used in generating at home and abroad.At present in China, coal total output 55% for coal-fired thermal power generation, and in power supply architecture, thermal power generation is the main generation mode of China, and the supply of electric power of China about 80% comes from fired power generating unit.Current China newly builds a power station still based on coal fired power plant, and the ratio of electric coal in coal total output increases fast.But coal fired power generation also discharges a large amount of pollutants while production electric power, comprises SO 2, flue dust, NO xand CO 2deng; And the generating net efficiency of China's coal fired power plant is compared with developed country and is still had larger gap.Thus, further improve efficiency of energy utilization thus not only reduced energy resource consumption but also the discharge of decreasing pollution thing, becoming the important task urgent again that China's power industry and even whole national economy realize sustainable development.
In recent years, along with power coal price goes up and the decline gradually of high-quality coal reserves ratio in coal gross reserves fast, the outstanding problem utilizing high water content brown coal combustion power generation to become power industry to show great attention to.In worldwide, brown coal account for 40% of world's coal gross reserves, China's brown coal reserves 2,900 hundred million tons, account for 16% of domestic coal gross reserves.Brown coal are coals that degree of coalification is minimum, have that moisture is high, volatile matter is high, calorific value is low, a feature such as the easy spontaneous combustion of easy-weathering in atmosphere, so be difficult to storage, and also unsuitable long-distance transportation.3/4 of China's brown coal are distributed in the Inner Mongol and the Northeast, and these brown coal total moistures, 25 ~ 40%, belong to old brown coal; All the other brown coal are mainly distributed in Yunnan Province, and these brown coal total moistures, 40 ~ 60%, containing wood fibre, belong to young brown coal; And the external moisture as state's brown coal such as Australia, Germany, Serbia, Indonesia is higher, can up to 70%.
The main path that current brown coal utilize is by electric power stations near coal-mines combustion power generation, brown coal and bituminous coal fired boiler many employings unit pulverized-coal system, is generally using stove cigarette and hot blast mixture or hot blast as pulverized coal preparation system drier; Meager coal and anthracite many employings bin storage type pulverizing system are generally using hot blast as pulverized coal preparation system drier.But compared with conventional bituminous coal fired boiler, these boiler using brown coal thermals efficiency are low, the large price of volume is high, greenhouse gas emissions are also larger.And, for high water content brown coal, unit pulverized-coal system is adopted to make in boiler First air containing the inert media such as a large amount of stove cigarette and water vapour, in addition fire box temperature is low again, high water content brown coal is made to there is outstanding combustion instability problem, cause boiler to be difficult to run safely and reliably, this seriously constrains effective utilization of domestic and international high water content brown coal.Meanwhile, because brown coal reactivity is high, brown coal coal dust is inflammable and explosive, and the burning of brown coal pulverized coal preparation system and explosion issues are also outstanding problems always perplexing lignite-fired unit safe and reliable operation for a long time.
In addition, the coal prognostic reserves being positioned at Xinjiang of China In The Eastern Junggar Basin " accurate eastern coalfield " reach 3,900 hundred million tons, are the maximum self-contained coalfields of China.Accurate eastern coal is except thermal discharge comparatively brown coal height, and other coal characteristic is similar to brown coal, also has moisture high (22 ~ 32%), volatile matter is high, ash fusion point is low, abrasiveness is low and the feature of easy spontaneous combustion.The large-sized station boiler that the exploitation of eastern coal aimed at by current pin in the industry all adopts unit pulverized-coal system, therefore for ensureing smooth combustion in pulverized coal preparation system drying capacity and stove, boiler all have employed very high hot blast temperature and primary air ratio.The result caused thus is the exhaust gas temperature general higher (exhaust gas temperature is generally more than 140 DEG C) of these accurate eastern coal burning boilers, correspondingly cause boiler thermal output and unit generation efficiency all lower; And too high primary air ratio makes low NO in stove xorganizing of burning is comparatively difficult, i.e. NO in furnace outlet flue gas xcontent is comparatively large, which increases pressure and the cost of the follow-up denitrating flue gas of boiler.
On the other hand, China's brown coal major production areas (Eastern Inner Mongolia) and accurate eastern coal producing region (Xinjiang region) are extreme dehydration area.Because fired power generating unit needs to consume large water gaging, water resources shortage has become these areas and has carried out power supply construction of base thus the primary restraining factors developing brown coal and accurate eastern coal resource.But as everyone knows, pulverized coal preparation system is also simultaneously a drying system, for ensureing that breeze airflow enters smooth combustion after stove, require that raw coal is dried to the very low coal dust moisture of moisture content by pulverized coal preparation system.Fuel coal of power station boiler amount is huge, therefore a large amount of moisture in coal is evaporated to water vapour in pulverized coal preparation system enters burner hearth with coal dust, one of constituent becoming boiler smoke.In addition, thermal power plant is water for industrial use rich and influential family, and China's brown coal producing region (such as Eastern Inner Mongolia) belongs to areas of serious mostly, and water resources shortage becomes the important restriction factor affecting near coal-mine power supply construction of base.Thus, if moisture in coal can be reclaimed, to China's brown coal and accurate eastern coal utilization, there is very important ecological protection meaning.But due to dry flue gas (mainly N a large amount of in stove 2, CO 2and excess dry air) dilution, the water capacity of boiler exhaust gas and aqueous dew point temperature are very low, and this makes by cooling boiler exhaust gas thus moisture in recovered flue gas becomes very difficult.For the in-service 600MW unit of certain combustion total moisture 40% brown coal, its boiler exhaust gas amount is 2800t/h, although containing 270t/h moisture in smoke evacuation, smoke evacuation water dew point only has 53 DEG C (water vapour volume shares 15%).Visible, because dry flue gas amount is huge and water dew point is low, reclaim moisture in smoke evacuation and need huge flue gas cooling heat exchanger and the enough low a large amount of cooling mediums of temperature, this makes from smoke evacuation, and to reclaim moisture only feasible in theory, do not have so far by cooling power station boiler exhaust gas thus realize the engineer applied of flue gas Water Sproading.
Utility model content
The utility model carries out to solve the problem, and object is to provide one to have outstanding Water Sproading benefit and energy-saving benefit, and can also improve the superheat steam drying powder process type coal generating system of generating efficiency.
The utility model provides a kind of superheat steam drying powder process type coal generating system, for burning to drive electrical power generators to raw coal, it is characterized in that, comprise: boiler controller system, heat energy is produced for carrying out burning to raw coal, and utilize heat energy that feedwater heating is obtained high-temperature high-pressure steam, comprise: powder process subsystem, boiler host subsystem, air-supply powder feeding subsystem and exhaust steam Water Sproading subsystem, and Steam Turbine, utilize high-temperature high-pressure steam to do work thus drive electrical power generators, comprise the feed pipe for carrying feedwater, for carrying the steam pipeline of high-temperature high-pressure steam, and steam turbine, wherein, powder process subsystem comprises: for grinding raw coal and carrying out drying thus the vapour powder generation drying device of formation vapour powder mixture by drier to raw coal, separation is carried out to vapour powder mixture and obtains coal dust and exhaust steam (exhaust steam: generally the cryogenic gas that Air Dried System is discharged is called weary gas, be accustomed to formulation according to this, in boiler milling system, also often claim the coal pulverizer gas that outlet is discharged to be weary gas, take water vapour as drier and defeated powder medium because of pulverized coal preparation system in the utility model, therefore claim the water vapour in coal pulverizer outlet vapour powder mixture to be exhaust steam) vapour powder separator, and generate the drier generating apparatus of drier, boiler host subsystem is used for feedwater to be heated as high-temperature high-pressure steam, comprise: burner hearth, the stove inner flue be connected with furnace outlet, be positioned at the coal burner of burner hearth entry position, air-supply powder feeding subsystem comprises: be connected for the machine supplying powder of pulverized coal conveying with vapour powder separator, the air and powder mixer be connected with machine supplying powder, the First air mixing chamber be connected with air and powder mixer, be positioned at the air preheater of stove inner flue afterbody, and for providing the pressure fan of environment cold wind, exhaust steam Water Sproading subsystem comprises: for carrying out the exhaust steam apparatus for recovering of Water Sproading to a part for exhaust steam, vapour powder separator comprises: vapour powder mixture is separated to the coal collector obtaining coal dust and exhaust steam, drier generating apparatus comprises: the exhaust steam pipeline be connected with coal collector for carrying exhaust steam, be communicated with on exhaust steam pipeline for carrying the exhaust steam circulating line of another part of exhaust steam, be connected with exhaust steam circulating line and exhaust steam in exhaust steam circulating line heated thus forms the exhaust steam heater of the superheated steam as drier, and drier is delivered to the superheat steam pipeline carrying out in vapour powder generation drying device circulating, exhaust steam heater utilize from steam turbine draw gas condensation heat thermosetting superheated steam is added to the exhaust steam exhaust steam heater, machine supplying powder is used for pulverized coal conveying to air and powder mixer, air and powder mixer is mixed to get wind powder mixture to from the First air of air-supply powder feeding subsystem and coal dust, air preheater carries out heating to a part for environment cold wind and obtains hot blast, a part for hot blast enters in air and powder mixer as First air with another part of environment cold wind after First air mixing chamber mixes, another part of hot blast directly enters in coal burner as Secondary Air, coal burner burns to the coal dust in wind powder mixture, coal dust and First air, Secondary Air burns and generates flue gas in burner hearth.
In the superheat steam drying powder process type coal generating system that the utility model provides, such feature can be had, also comprise: gas cleaning subsystem, export with the afterbody of stove inner flue and be connected, comprise: the deduster connected successively, air-introduced machine, desulfurizer, chimney.
In the superheat steam drying powder process type coal generating system that the utility model provides, can also have such feature: wherein, exhaust steam apparatus for recovering comprises: be communicated with the exhaust steam output channel on exhaust steam pipeline, be connected with exhaust steam output channel for exhaust steam being condensed into the condenser of condensate water and storing the water collector that reclaims condensate water and be connected with exhaust steam output channel and exhaust steam directly introduced the exhaust steam bypass duct of desulfurizer.
In the superheat steam drying powder process type coal generating system that the utility model provides, such feature can also be had: wherein, exhaust steam Water Sproading subsystem also comprises: the residual air conveying device of the residual gas exported for carrying condenser, and residual air conveying device comprises: be connected with the outlet of condenser for the residual air pipeline that residual gas delivered in First air mixing chamber and be connected with residual air pipeline and residual gas is directly introduced desulfurizer residual air bypass duct.
In the superheat steam drying powder process type coal generating system that the utility model provides, can also have such feature: wherein, vapour powder generates drying device and also comprises: grind raw coal and form the coal pulverizer of vapour powder mixture with dry and be connected with the outlet of coal pulverizer for being separated the meal in vapour powder mixture and meal being sent back to the mill separator in coal pulverizer.
In the superheat steam drying powder process type coal generating system that the utility model provides, can also have such feature: wherein, vapour powder generates drying device and also comprises: be connected with coal collector the Pulverized Coal Bin of storing coal dust.
In the superheat steam drying powder process type coal generating system that the utility model provides, can also have such feature: wherein, exhaust steam heater comprises: be connected with Steam Turbine for carry draw gas extraction line, for carrying the hydrophobic drain water piping returning Steam Turbine drawing gas and formed after exhaust steam heater condensation heat.
In the superheat steam drying powder process type coal generating system that the utility model provides, such feature can also be had: wherein, vapour powder generates drying device and also comprises: outlet is connected for carrying out the predrying pipe of pre-dried raw coal, steam pipeline to raw coal with the entrance of coal pulverizer, the import of the predrying pipe of raw coal is communicated on superheat steam pipeline by steam pipeline, and superheated steam carries out predrying as predry drying prescription to the raw coal in the predrying pipe of raw coal.
In the superheat steam drying powder process type coal generating system that the utility model provides, such feature can also be had: wherein, powder process subsystem also comprises: be connected for carrying the appendix of gas and being located on appendix for controlling to open and close the control valve of appendix with exhaust steam circulating line, appendix is controlled to exhaust steam circulating line conveying gas by control valve, as drier after gas is heated, after Preset Time, control valve controls appendix stopping to exhaust steam circulating line conveying gas.
In the superheat steam drying powder process type coal generating system that the utility model provides, such feature can also be had: wherein, gas be in air or industrial inerting gas any one.
The effect of utility model and effect
In superheat steam drying powder process type coal generating system of the present utility model, because powder process subsystem take superheated steam as drier and the ventilation medium of powder process subsystem, and the superheated steam moisture generated by vapour powder in the raw coal in drying device evaporate the circulation exhaust steam warp that formed with the condensation heat of extracted steam from turbine to add thermosetting, superheat steam temperature and flow meet the requirement of powder process subsystem drying capacity and coal pulverizer ventilation respectively, except except the circulation exhaust steam of powder process subsystem Inner eycle work, another part exhaust steam constantly produced in the evaporation of powder process subsystem because of former moisture in coal carries out Water Sproading by exhaust steam Water Sproading subsystem.
The utility model take superheated steam as the drier of powder process subsystem, whole powder process subsystem is run under complete inerting atmosphere, ensure that the safe and reliable operation of the high-volatile coal such as brown coal and accurate eastern coal powder process, solve pulverized coal preparation system burning and the explosion issues of long-standing problem brown coal and accurate eastern coal unit safety reliability service.And the inside achieving inertia powder process drier produces and recycling, extra steam, nitrogen production system is not needed in pulverizing process, also do not need to consume other medium such as flue gas, hot blast, make pulverizing process both safe and reliable, flow process is succinctly efficient again.And be pulverized coal preparation system drier with superheated steam, improve the pulverized coal particle particle size uniformity poor bursting caused in a large number by coal grain in the dry and hot-air drying process of stove cigarette in the past, thus contribute to improving coal powder performance, improve Combustion Efficiency of Coal Powder.
And, superheated steam in the utility model utilizes extracted steam from turbine to heat exhaust steam to obtain, namely the thermal source in exhaust steam heater comes from the condensation heat that Steam Turbine is drawn gas, the condensation heat drawn gas is made effectively to be used in the drying capacity of coal pulverizing system, also namely make the condensation used heat of steam in Steam Turbine effectively be utilized by steam generator system, significantly decrease the energy loss of Steam Turbine thermodynamic cycle.Thus, apply this technical scheme and power plant efficiency also can be made significantly to improve, there is outstanding energy-saving benefit.
The utility model completely with powder process subsystem internal produce water vapour for drier and defeated powder medium, make the Water Sproading of the powder process exhaust steam being almost either pure steam become very easy.By the waste heat recovery of powder process exhaust steam, can further improve the efficiency of energy utilization of boiler and coal-fired energy consumption system; And the recovery and reuse of great lot of water resources, to rich coal water-deficient area, there is immeasurable environment protection significance especially.
The utility model carries out the separation of vapour powder by coal collector to vapour powder mixture and obtains low moisture coal dust, and coal quantity is significantly improved.This coal dust after drying and upgrading is sent into boiler by uniform temperature air and is burnt, and will there will be no the low combustion instability of in-furnace temperature, low NO xthe problems such as burning tissues burning difficulty.Meanwhile, adopt pulverized coal carried by hot air that inert gas content in First air is significantly reduced, breeze airflow ignition heat reduces thus, and in First air, oxygen concentration improves.Coefficient result is the combustion stability and the efficiency of combustion that had both improve breeze airflow, also makes the low NOx combustion of breeze airflow organize convenient, thus realizes clean and effective smooth combustion.And, this coal dust after drying and upgrading sends into boiler combustion by the First air in powder feeding subsystem of blowing with uniform temperature, and the moisture from the raw coal that powder process subsystem evaporates no longer enters boiler with powder feeding medium, boiler exhaust gas amount is reduced in a large number, correspondingly exhaust gas temperature also can reduce, finally make boiler exhaust gas heat loss significantly reduce, boiler thermal output significantly improves.
Therefore, the superheat steam drying powder process type coal generating system that the utility model can provide has outstanding Water Sproading benefit and energy-saving benefit, and can also improve generating efficiency.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of superheat steam drying powder process type coal generating system in the utility model embodiment;
Fig. 2 is the structured flowchart of boiler controller system in the utility model embodiment;
Fig. 3 is the structural representation of superheat steam drying powder process type coal generating system in the utility model embodiment;
Fig. 4 is the flow chart of superheat steam drying powder process type coal generating system in the utility model embodiment;
Fig. 5 is the block diagram of powder feeding subsystem of blowing in the utility model embodiment; And
Fig. 6 is the block diagram of powder process subsystem in the utility model embodiment.
Detailed description of the invention
The technological means realized to make the utility model, creation characteristic, reach object and effect is easy to understand, following examples relate to superheat steam drying powder process type coal generating system to the utility model in conjunction with the accompanying drawings and embodiments and are described in detail.
Fig. 1 is the structured flowchart of superheat steam drying powder process type coal generating system in the utility model embodiment.
As shown in Figure 1, superheat steam drying powder process type coal generating system 100 comprises: boiler controller system 501, Steam Turbine 502 and generating set 503.
Raw coal enters Steam Turbine 502 to the water vapour that water adds thermosetting HTHP do work at the burn heat that produces of boiler controller system 501, and then drive electrical generators group 503 generates electricity.
Fig. 2 is the structured flowchart of superheat steam drying powder process type coal generating system in the utility model embodiment.
As shown in Figure 2, boiler controller system 501, comprising: powder process subsystem 401, boiler host subsystem 402, air-supply powder feeding subsystem 403, exhaust steam Water Sproading subsystem 404 and gas cleaning subsystem 405.
First air and Secondary Air is formed respectively after air-supply powder feeding subsystem 403 pairs of environment cold wind 2 process, wherein, the coal dust that First air and powder process subsystem 401 pairs of raw coal 1 grind formation mixes in rear feeding boiler host subsystem 402 by a certain percentage, the Secondary Air of air-supply powder feeding subsystem 403 then directly enters in boiler host subsystem 402 and participates in burning, in powder process subsystem 401, isolated a part of exhaust steam is transported to exhaust steam Water Sproading subsystem 404 and carries out Water Sproading, and exhaust steam is recovered after being condensed into condensate water and recycles.Another part exhaust steam is heated as superheated steam by from the heat in the drawing gas of Steam Turbine 502, and enters in powder process subsystem 401 afterwards as drier.The flue gas of boiler host subsystem 402 enter gas cleaning subsystem 405 be cleaned after discharged to air.
Fig. 3 is the structural representation of superheat steam drying powder process type coal generating system in the utility model embodiment.
As shown in Figure 3, Steam Turbine 502 utilizes the heat energy produced in boiler controller system 501 that feedwater heating is obtained high-temperature high-pressure steam thus drives generator unit 503.Steam Turbine 502 comprises feed pipe 61, steam pipeline 62, steam turbine 60 and heat regenerative system of drawing gas (not shown in FIG.).Generating set 503 comprises generator 70.Generator 70 is connected with steam turbine 60, and generator 70 generates electricity under the driving of steam turbine 60.
Powder process subsystem 401 comprises: vapour powder generates drying device, drier generating apparatus, vapour powder separator.Vapour powder generation drying device is used for grinding raw coal 1 and the drier utilizing drier generating apparatus to generate carries out drying to raw coal 1 thus forms vapour powder mixture, primary mixture is separated after entering vapour powder separator obtains coal dust and exhaust steam, gained coal dust can be stored or directly be sent into burning in boiler host subsystem 402, the major part of gained exhaust steam is as the drier of powder process subsystem 401 and ventilation medium in the work of powder process subsystem 401 Inner eycle, and another part exhaust steam is recycled after being condensed into condensate water by exhaust steam Water Sproading subsystem 404.
Vapour powder generates drying device and comprises: run coal bin 5, feeder 6, coal pulverizer 7, mill separator 8.Vapour powder separator comprises: powder process pipeline 9, coal collector 10, Pulverized Coal Bin 11.Drier generating apparatus comprises: exhaust steam pipeline 30, exhaust steam blower fan 31, exhaust steam circulating line 32, exhaust steam heater 33, extraction line 63, drain water piping 64, superheat steam pipeline 34, booster fan 35, appendix 52, control valve 51.Thermal source in exhaust steam heater 33 comes from the condensation heat drawn gas in Steam Turbine 502, utilizes the superheated steam that the heating exhaust steam of drawing gas of Steam Turbine 502 obtains as drier.Wherein, the one-level that directly can extract the desiccant temperature that exhaust steam heating enough reaches needed for powder process subsystem by temperature in steam turbine 60 of drawing gas is drawn gas, in addition, the more bleedings that also can extract different temperatures stress level of drawing gas progressively heats exhaust steam until desiccant temperature needed for powder process subsystem.
Boiler host subsystem 402 obtains high-temperature high-pressure steam for carrying out heating to feedwater, comprising: boiler main frame 24, coal burner 23.The stove inner flue (not shown in FIG.) that boiler main frame 24 comprises burner hearth (not shown in FIG.) and is connected with burner hearth outlet flue.Burner hearth is used for making coal dust and the heat release of air Thorough combustion and produces flue gas, the heat of the water wall absorption flue gas of burner hearth circumference thus make flue gas temperature of hearth outlet within suitable scope, is furnished with carbonated drink heating surface, air preheater in the flue that furnace outlet is later.
Air-supply powder feeding subsystem 403 comprises: machine supplying powder 12, pressure fan 14, air preheater 15, Secondary Air hot air duct 16, First air hot air duct 17, first cooling by wind wind pipeline 18, First air mixing chamber 19, First air booster fan 20, First air pipeline 21, powder feeding pipes 22, air and powder mixer 13.Air preheater 15 pairs of environment cold wind 2 carry out heating and obtain hot blast.
Exhaust steam Water Sproading subsystem 404 comprises: exhaust steam apparatus for recovering and residual air conveying device.Exhaust steam apparatus for recovering comprises: exhaust steam output channel 36, condenser 37, exhaust steam bypass duct 41, water collector 40.Residual air conveying device comprises: air ejector 38, residual air pipeline 39 and residual air bypass duct 42.
Gas cleaning subsystem 405 comprises: deduster 25, smoke discharging pipe 26, air-introduced machine 27, desulfurizer 28 and chimney 29.
The annexation of superheat steam drying powder process type coal generating system 501 entirety:
Run coal bin 5, feeder 6, coal pulverizer 7, powder process pipeline 9 and coal collector 10 connect in turn, mill separator 8 is located at the top of coal pulverizer 7 and is connected with coal pulverizer 7, the venthole of coal collector 10 is connected with one end of exhaust steam pipeline 30, the coal outlet of coal collector 10 is connected with the import of Pulverized Coal Bin 11, the outlet of Pulverized Coal Bin 11 is connected with machine supplying powder 12, machine supplying powder 12 is connected with the powder inlet of air and powder mixer 13, the outlet of air and powder mixer 13 is connected with one end of powder feeding pipes 22, and the other end of powder feeding pipes 22 is connected with coal burner 23.Stove inner flue is connected with the outlet of burner hearth, and air preheater 15 is positioned at the afterbody of stove inner flue.
Pressure fan 14 exports and to be connected with the air side import of air preheater 15 and to be connected with one end of first cooling by wind airduct 18, and the air side outlet of air preheater 15 is connected with the air inlet of coal burner 23 with First air mixing chamber 19 with First air hot air duct 17 respectively by Secondary Air hot air duct 16.The other end of first cooling by wind airduct 18 is connected with the air inlet of First air mixing chamber 19, and First air mixing chamber 19 is connected with First air booster fan 20, and First air booster fan 20 is connected with air and powder mixer 13 by First air pipeline 21.
The entrance of exhaust steam pipeline 30 is connected with the gas vent of coal collector 10.Exhaust steam blower fan 31 is located on exhaust steam pipeline 30, for extracting the exhaust steam in coal collector 10.The arrival end of exhaust steam circulating line 32 is connected with the outlet of exhaust steam pipeline 30, the port of export of exhaust steam circulating line 32 is connected with the air inlet of exhaust steam heater 33, the gas outlet of exhaust steam heater 33 is connected with one end of superheat steam pipeline 34, the other end of superheat steam pipeline 34 is connected with the entrance of booster fan 35, and the outlet of booster fan 35 is connected with coal pulverizer 7.Appendix 52 is connected with exhaust steam circulating line 32, and control valve 51 is located on appendix 52 and opens and closes appendix 52 for controlling.
The entrance of exhaust steam output channel 36 is communicated with on exhaust steam pipeline 30, the outlet of exhaust steam output channel 36 is connected with the import of condenser 37, condenser 37 has refrigerant inlet 70 and refrigerant exit 71, exhaust steam bypass duct 41 is in parallel with condenser 37, water collector 40 is connected with condenser 37, for storing the condensate water reclaimed by condenser 37, the residual air outlet of condenser 37 is connected with the import of air ejector 38, the outlet of air ejector 38 connects one end of residual air pipeline 39 and one end of residual air bypass duct 42 respectively, the other end of residual air bypass duct 42 connects desulfurizer 28, the other end of residual air pipeline 39 connects First air mixing chamber 19.Remaining incondensable gas (hereinafter referred to as residual gas) after condenser 37 recycle-water steam, this residual gas enters First air mixing chamber 19 through residual air pipeline 39 and enters in burner hearth as First air, make fuel gas abundant after-flame in burner hearth that may contain in residual gas, in addition, residual gas also can enter in desulfurizer 28 through residual air bypass duct 42.This residual gas is other the incoagulable gas mixed in water vapour, and such as seepage enters the fuel gas that the air of exhaust steam apparatus for recovering and raw coal 1 volatilize in pulverizing process.
Outlet, deduster 25, the air-introduced machine 27 of stove inner flue, sequentially pass through smoke discharging pipe 26 between desulfurizer 28 with chimney 29 and be connected.
One end of the feed pipe 61 of Steam Turbine 502 is connected with the feedwater outlet of Steam Turbine 502, the other end is connected with boiler host subsystem 402, one end of steam pipeline 62 is connected with boiler host subsystem 402, the other end is connected with the steam inlet of Steam Turbine 502, Steam Turbine 502 is connected by the import of extraction line 63 with exhaust steam heater 33, and Steam Turbine 502 is connected by the outlet of drain water piping 64 with exhaust steam heater 33, that extracts out from steam turbine 60 is drawn gas to be entered exhaust steam heater 33 by extraction line 63 and heats exhaust steam, drawing gas afterwards, formation is hydrophobic flows back into Steam Turbine 502 by drain water piping 64.
Fig. 4 is the flow chart of superheat steam drying powder process type coal generating system in the utility model embodiment.
As shown in Figure 4, the operation principle of superheat steam drying powder process type coal generating system 501:
The flow process (S1-S4) of coal: raw coal 1 delivers into coal pulverizer 7 by run coal bin 5 through feeder 6, raw coal 1 is ground into coal dust in coal pulverizer 7, export from coal pulverizer 7 after being entered the desiccant dryness of coal pulverizer 7 simultaneously, the mixture of exhaust steam and coal dust that coal pulverizer 7 exports is, vapour powder mixture when mill separator 8, meal is separated and reenters in coal pulverizer 7 and again grinds.Vapour powder mixture through mill separator 8 enters coal collector 10 by powder process pipeline 9, exhaust steam in vapour powder mixture and coal dust are isolated by coal collector 10, coal dust is stored by Pulverized Coal Bin 11, coal dust in Pulverized Coal Bin 11 sends into air and powder mixer 13 by machine supplying powder 12, mix with the First air from First air mixing chamber 19 in air and powder mixer 13, be then sent to coal burner 23 by powder feeding pipes 22 and enter in burner hearth the also heated feed water that burns together with Secondary Air.
Fig. 5 is the block diagram of powder feeding subsystem of blowing in the utility model embodiment.
The flow process (S4) of air: as shown in Fig. 3, Fig. 4, Fig. 5, it is interior by flue gas that environment cold wind 2 namely, air sends into air preheater 15 by pressure fan 14.The hot blast major part of air preheater 15 air side outlet is directly drawn toward coal burner 23 through Secondary Air hot air duct 16 as Secondary Air.The environment cold wind 2 that another small part hot blast and first cooling by wind wind pipeline 18 are carried carries out being mixed to form First air in First air mixing chamber 19, the environment cold wind 2 that first cooling by wind wind pipeline 18 is carried can regulate the temperature of First air, coal dust through being entered air and powder mixer 13 by after the supercharging of First air booster fan through First air pipeline 21, and then is sent in burner hearth and is burnt by First air.
Flue gas flow: coal dust and air generate flue gas in the burner hearth combustion of boiler 19, flue gas in burner hearth is discharged from stove inner flue, at stove inner flue afterbody, air preheater 15 is heated, the flue gas of discharging enters air-introduced machine 27 by smoke discharging pipe 26 after deduster 25 purifies, enter in desulfurizer 28 afterwards, through the flue gas 3 of desulfurizing and purifying by chimney 29 discharged to atmospheric environment.
Fig. 6 is the block diagram of powder process subsystem in the utility model embodiment.
As shown in Figure 6, water vapour flow process (S6-1, S6-2): be made up of the moisture evaporation of the water vapour in powder process subsystem 401 by raw coal 1.Export at coal pulverizer 7 and be called exhaust steam between the air inlet of exhaust steam heater 33, between exhaust steam heater 33 gas outlet and coal pulverizer 7 entrance, be called superheated steam.Exhaust steam is separated in coal collector 10 with coal dust, isolated exhaust steam is extracted out by exhaust steam blower fan 31 and is divided into two parts, part exhaust steam is sent into exhaust steam heater 33 by exhaust steam circulating line 32 and is carried out adding thermosetting superheated steam, this superheated steam sends into coal pulverizer 7 as drier through superheat steam pipeline 34, drying is carried out to the raw coal 1 entering coal pulverizer 7, the vapour powder mixture that coal pulverizer 7 exports isolates coal dust by coal collector 10 and exhaust steam forms, the moisture that exhaust steam is now evaporated by superheated steam and the raw coal 1 as drier forms, the part of exhaust steam of discharging from coal collector 10 venthole enters exhaust steam heater 33 and as drier at powder process subsystem 401 Inner eycle, a part of exhaust steam is sent into condenser 37 through exhaust steam output channel 36 and is reclaimed in addition.Exhaust steam is cooled by refrigerant 80 in condenser 37, thus obtains a large amount of condensate water, and condensate water combines in water collector 40.
The flow process (S5) of feedwater: water forms high-temperature high-pressure steam after feed pipe 61 is heated by boiler host subsystem 402, high-temperature high-pressure steam is sent in Steam Turbine 502 through steam pipeline 62 and is done work, and Steam Turbine 502 drive electrical generators 70 works.Heat regenerative system extraction section of drawing gas in Steam Turbine 502 is drawn gas, and this draws gas and to heat the exhaust steam in exhaust steam heater 33, produces the superheated steam as drier.
The residual gas that exhaust steam apparatus for recovering is discharged after reclaiming water vapour is delivered in First air mixing chamber 19 or in desulfurizer 28 respectively through residual air conveying device.When this residual gas contains fuel gas, close the valve on residual air bypass duct 42, this residual gas is all entered in burner hearth through residual air pipeline 39 and burns; When this residual gas is not containing fuel gas, opens the valve on residual air bypass duct 42, this residual gas is discharged after gas cleaning subsystem 405.
In the present embodiment, first, control steam appendix 52 by control valve 51 and carry gas 50 to exhaust steam circulating line 32, as drier, drying is carried out to the raw coal 1 entered in coal pulverizer 7 and coal dust after gas 50 is heated, then, after Preset Time, control valve 51 controls steam appendix 52 and stops carrying gas 50 to exhaust steam circulating line 32, and the valve opened on exhaust steam circulating line 32 sets up exhaust steam recirculation simultaneously.After running a period of time, the gas 50 inputted by steam appendix 52 is progressively discharged by exhaust steam output channel 36, and make drier convergence be either pure steam and do not contain other assorted gas, so achieving either pure steam is that drier carries out drying to coal dust.
The effect of embodiment and effect
In the superheat steam drying powder process type coal generating system of the present embodiment, powder process subsystem take superheated steam as powder process subsystem drier and coal pulverizer ventilation medium, the circulation exhaust steam warp that superheated steam is formed because moisture in coal evaporates by coal pulverizer outlet is to draw gas as the exhaust steam heater of heat medium adds thermosetting in Steam Turbine, superheat steam temperature and flow meet the requirement of powder process subsystem drying capacity and coal pulverizer ventilation respectively, except except the circulation exhaust steam of powder process subsystem Inner eycle work, the another part produced because moisture in coal constantly evaporates in powder process subsystem exports exhaust steam and carries out Water Sproading by exhaust steam Water Sproading subsystem.
And, superheated steam in the present embodiment utilizes extracted steam from turbine to heat exhaust steam to obtain, namely the thermal source in exhaust steam heater comes from the condensation heat that Steam Turbine is drawn gas, the condensation heat drawn gas is made effectively to be used in the drying capacity of coal pulverizing system, also namely make the condensation used heat of steam in Steam Turbine effectively be utilized by steam generator system, significantly decrease the energy loss of Steam Turbine thermodynamic cycle.
In datonation-inhibition inert gas flue gas, nitrogen and water vapour that industry is conventional, water vapour has best datonation-inhibition function.The present embodiment take superheated steam as the drier of powder process subsystem, whole powder process subsystem is run under complete inerting atmosphere, ensure that the safe and reliable operation of the high-volatile coal such as brown coal and accurate eastern coal powder process, solve pulverized coal preparation system burning and the explosion issues of long-standing problem brown coal and accurate eastern coal unit safety reliability service.And the inside achieving inertia powder process drier produces and recycling, extra steam, nitrogen production system is not needed in pulverizing process, also do not need to consume other medium such as flue gas, hot blast, make pulverizing process both safe and reliable, flow process is succinctly efficient again.And be pulverized coal preparation system drier with superheated steam, improve the pulverized coal particle particle size uniformity poor bursting caused in a large number by coal grain in the dry and hot-air drying process of stove cigarette in the past, thus contribute to improving coal powder performance, improve Combustion Efficiency of Coal Powder.
The present embodiment completely with powder process subsystem internal produce water vapour for drier and defeated powder medium, make the waste heat of the powder process exhaust steam being almost either pure steam and Water Sproading become very easy.By the waste heat recovery of powder process exhaust steam, can further improve the efficiency of energy utilization of boiler and coal-fired energy consumption system; And the recovery and reuse of great lot of water resources, to rich coal water-deficient area, there is immeasurable environment protection significance especially.
The present embodiment carries out the separation of vapour powder by coal collector to vapour powder mixture and obtains low moisture coal dust, and coal quantity is significantly improved.This coal dust after drying and upgrading is sent into boiler by uniform temperature air and is burnt, and will there will be no the low combustion instability of in-furnace temperature, low NO xthe problems such as burning tissues burning difficulty.Meanwhile, adopt pulverized coal carried by hot air that inert gas content in First air is significantly reduced, breeze airflow ignition heat reduces thus, and in First air, oxygen concentration improves.Coefficient result is the combustion stability and the efficiency of combustion that had both improve breeze airflow, also makes the low NOx combustion of breeze airflow organize convenient, thus realizes clean and effective smooth combustion.And, this coal dust after drying and upgrading sends into boiler combustion by the First air in powder feeding subsystem of blowing with uniform temperature, and the moisture from the raw coal that powder process subsystem evaporates no longer enters boiler with powder feeding medium, boiler exhaust gas amount is reduced in a large number, correspondingly exhaust gas temperature also can reduce, finally make boiler exhaust gas heat loss significantly reduce, boiler thermal output significantly improves.
In the present embodiment, burn because the fuel gas that may contain in water vapour is sent back in boiler by residual air conveying device, thus fully ensure that the efficiency of combustion of raw coal in steam generator system.
To sum up, embodiment can provide a kind of green high-efficient coal-burning boiler unit, solve the problem of high-moisture coal-fired boiler combustion instability, overcome the inefficient shortcoming of traditional high-moisture coal-fired boiler hot, while significantly improving boiler thermal output, make powder process subsystem run under inerting atmosphere thus improve the safety in operation of high volatile coal powder process subsystem, more outstanding is, the recovery very easily Project Realization of moisture in coal is made using superheated steam as drier, also improve coal generating system efficiency further by the recycling of steam condensation waste heat simultaneously, thus the utility model superheat steam drying powder process type coal generating system has energy-saving benefit and the environment protection significance of highly significant.
Superheat steam drying powder process type coal generating system involved by certain the utility model is not merely defined in structure in the above-described embodiments.Above content is only the basic explanation under the utility model design, and according to any equivalent transformation that the technical solution of the utility model is done, all should belong to protection domain of the present utility model.
Above-mentioned embodiment is preferred case of the present utility model, is not used for limiting protection domain of the present utility model.
The gas of appendix conveying can be air, also directly can to carry in the inerting gases such as water vapour, nitrogen, flue gas any one.
When raw coal moisture is higher, the predrying pipe of raw coal can also be set between coal pulverizer and feeder, the import of the predrying pipe of raw coal is communicated on superheat steam pipeline by steam pipeline, part superheated steam is transported in the predrying pipe of raw coal and directly contacts with raw coal by steam pipeline, thus carry out predrying to raw coal, achieve raw coal dry safely by superheated steam.
Predry drying prescription in the predrying pipe of raw coal can be not only the part superheated steam carried by steam pipeline, also can be that the entrance point of the direct pipe predrying with raw coal of superheat steam pipeline is connected, superheated steam through raw coal predrying pipe raw coal is carried out predrying after enter coal pulverizer further drying carried out to vapour powder mixture.

Claims (9)

1. a superheat steam drying powder process type coal generating system, for burning to drive electrical power generators to raw coal, is characterized in that, comprising:
Boiler controller system, produces heat energy for carrying out burning to described raw coal, and utilizes described heat energy that feedwater heating is obtained high-temperature high-pressure steam, comprise: powder process subsystem, boiler host subsystem, air-supply powder feeding subsystem and exhaust steam Water Sproading subsystem; And
Steam Turbine, utilizing described high-temperature high-pressure steam do work thus drive described electrical power generators, comprising for carrying the feed pipe of described feedwater, for carrying steam pipeline and the steam turbine of described high-temperature high-pressure steam,
Wherein, described powder process subsystem comprises: for grinding described raw coal and carrying out drying by drier to described raw coal thus the vapour powder forming vapour powder mixture generates drying device, is separated the vapour powder separator obtaining coal dust and exhaust steam and the drier generating apparatus generating described drier to described vapour powder mixture
Described boiler host subsystem is used for described feedwater to be heated as described high-temperature high-pressure steam, comprises: burner hearth, the stove inner flue be connected with described furnace outlet, be positioned at the coal burner of described burner hearth entry position,
Described air-supply powder feeding subsystem comprises: be connected with described vapour powder separator for the machine supplying powder of pulverized coal conveying, the air and powder mixer be connected with described machine supplying powder, the First air mixing chamber be connected with described air and powder mixer, be positioned at described stove inner flue afterbody air preheater and for providing the pressure fan of environment cold wind
Described exhaust steam Water Sproading subsystem comprises: for carrying out the exhaust steam apparatus for recovering of Water Sproading to a part for described exhaust steam,
Described vapour powder separator comprises: be separated to described vapour powder mixture the coal collector obtaining described coal dust and described exhaust steam,
Described drier generating apparatus comprises: be connected with described coal collector for carry described exhaust steam exhaust steam pipeline, to be communicated with on described exhaust steam pipeline for carrying the exhaust steam circulating line of another part of described exhaust steam, to be connected with described exhaust steam circulating line and the described exhaust steam of described exhaust steam circulating line to be heated thus is formed as the exhaust steam heater of the superheated steam of described drier and described drier be delivered to described vapour powder and generate the superheat steam pipeline circulated in drying device
Described exhaust steam heater utilizes and adds superheated steam described in thermosetting from the condensation heat drawn gas of described steam turbine to the exhaust steam described exhaust steam heater,
Described machine supplying powder for carrying described coal dust to described air and powder mixer,
Described air and powder mixer is mixed to get wind powder mixture to from the First air of described air-supply powder feeding subsystem and described coal dust,
The part of described air preheater to described environment cold wind is carried out heating and is obtained hot blast, a part for described hot blast enters in described air and powder mixer as described First air with another part of described environment cold wind after described First air mixing chamber mixes, another part of described hot blast directly enters in described coal burner as Secondary Air
Described coal burner burns to the described coal dust in described wind powder mixture,
Described coal dust and described First air, described Secondary Air burn and generate flue gas in described burner hearth.
2. superheat steam drying powder process type coal generating system according to claim 1, is characterized in that, also comprise:
Gas cleaning subsystem, exports with the afterbody of described stove inner flue and is connected, comprise: the deduster connected successively, air-introduced machine, desulfurizer, chimney.
3. superheat steam drying powder process type coal generating system according to claim 2, is characterized in that:
Wherein, described exhaust steam apparatus for recovering comprises: be communicated with the exhaust steam output channel on described exhaust steam pipeline, be connected with described exhaust steam output channel for described exhaust steam being condensed into the condenser of condensate water and storing the water collector that reclaims described condensate water and be connected with described exhaust steam output channel and described exhaust steam directly introduced the exhaust steam bypass duct of described desulfurizer.
4. superheat steam drying powder process type coal generating system according to claim 3, is characterized in that:
Wherein, described exhaust steam Water Sproading subsystem also comprises: the residual air conveying device of the residual gas exported for carrying described condenser,
Described residual air conveying device comprises: be connected with the outlet of described condenser for the residual air pipeline that described residual gas delivered in described First air mixing chamber and be connected with described residual air pipeline and described residual gas is directly introduced described desulfurizer residual air bypass duct.
5. superheat steam drying powder process type coal generating system according to claim 1, is characterized in that:
Wherein, described vapour powder generation drying device also comprises: grind described raw coal and form the coal pulverizer of described vapour powder mixture with dry and be connected with the outlet of described coal pulverizer for being separated the meal in described vapour powder mixture and sending described meal back to mill separator in described coal pulverizer.
6. superheat steam drying powder process type coal generating system according to claim 1, is characterized in that:
Wherein, described exhaust steam heater comprises: be connected with described Steam Turbine for draw gas described in carrying extraction line, for the hydrophobic drain water piping returning described Steam Turbine formed after described exhaust steam heater condensation heat that draws gas described in carrying.
7. superheat steam drying powder process type coal generating system according to claim 5, is characterized in that:
Wherein, described vapour powder generates drying device and also comprises: outlet is connected for carrying out the predrying pipe of pre-dried raw coal, steam pipeline to described raw coal with the entrance of described coal pulverizer,
The import of the predrying pipe of described raw coal is communicated on described superheat steam pipeline by described steam pipeline,
Described superheated steam carries out predrying as predry drying prescription to the described raw coal in the predrying pipe of described raw coal.
8. superheat steam drying powder process type coal generating system as claimed in any of claims 1 to 7, is characterized in that:
Wherein, described powder process subsystem also comprises: be connected for carrying the appendix of gas and being located at for controlling to open and close the control valve of described appendix on described appendix with described exhaust steam circulating line,
Control described appendix by described control valve and carry described gas to described exhaust steam circulating line, as described drier after described gas is heated, after Preset Time, described control valve controls the stopping of described appendix and carries described gas to described exhaust steam circulating line.
9. superheat steam drying powder process type coal generating system according to claim 8, is characterized in that:
Wherein, described gas be in air or industrial inerting gas any one.
CN201420677551.7U 2014-11-13 2014-11-13 Superheat steam drying powder process type coal generating system Withdrawn - After Issue CN204240389U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104329667A (en) * 2014-11-13 2015-02-04 上海理工大学 Superheated steam drying power-making coal-fired power generation system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104329667A (en) * 2014-11-13 2015-02-04 上海理工大学 Superheated steam drying power-making coal-fired power generation system

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