CN104373947B - Superheat steam drying powder process type coal generating system - Google Patents
Superheat steam drying powder process type coal generating system Download PDFInfo
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- CN104373947B CN104373947B CN201410640071.8A CN201410640071A CN104373947B CN 104373947 B CN104373947 B CN 104373947B CN 201410640071 A CN201410640071 A CN 201410640071A CN 104373947 B CN104373947 B CN 104373947B
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Abstract
The invention provides a kind of superheat steam drying powder process type coal generating system, for rear drive generator generating that raw coal is burnt, comprise: boiler unit, comprises: powder process subsystem, boiler host subsystem, air-supply powder feeding subsystem and exhaust steam water reclaim 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 utilization of drier generating apparatus adds thermosetting superheated steam from the exhaust steam to exhaust steam heater of drawing gas of steam turbine, exhaust steam apparatus for recovering carries out preheating to a part for environment cold wind and obtains warm air, air preheater further heats and obtains hot blast part warm air, a part for hot blast enters in air and powder mixer as a wind after a wind mixing chamber mixes with another part of warm air, another part of hot blast is directly sent in coal burner and is burnt as Secondary Air.
Description
Technical field
The present invention relates to a kind of coal fired power generation field, be specifically related to boiler air-supply, superheat steam drying powder process,Moisture in coal recovery technology and utilize the superheat steam drying powder process type coal fired power generation of the heat that draws gas of steam turbineSystem.
Background technology
China is the country of the few oily deficency of a rich coal, coal in China's energy supply always in core masterLead status, future quite over a long time in, can be sustained in China taking coal as main energy resource structure.Because coal fired power plant has the extensive feature that uses coal of concentrating, be conducive to accomplish efficient, clean utilization coalCharcoal, thereby coal is mainly used in generating at home and abroad. At present in China, coal total output 55% for fire coalThermal power generation, and aspect power supply architecture, thermal power generation is the main generation mode of China, the electricity of China approximately 80%Power supply comes from fired power generating unit. At present China newly builds a power station still taking coal fired power plant as main, and electric coal is total at coalRatio in output is just at rapid growth. But coal fired power generation also discharges a large amount of in producing electric powerPollutant, comprises SO2, flue dust, NOXAnd CO2Deng; And, the generating net efficiency of China's coal fired power plant and send outReaching country compares and still has larger gap. Thereby, both reduced the energy and disappeared thereby further improve efficiency of energy utilizationConsumption reduces again pollutant emission, becomes China's power industry and even whole national economy and realizes sustainable developmentImportant urgent task again.
In recent years, along with electric coal price lattice go up fast and high-quality coal reserves in coal gross reserves ratio byGradually decline, utilize high-moisture brown coal combustion power generation to become the outstanding problem that power industry is shown great attention to. EntirelyIn world wide, brown coal account for 40% of world's coal gross reserves, 2,900 hundred million tons of China's brown coal reserves, account for16% 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, in air the feature such as the easy spontaneous combustion of easy-weathering, so be difficult to storage, 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 oldBrown coal; All the other brown coal are mainly distributed in Yunnan Province, and these brown coal total moistures, 40～60%, contain wood fibre,Belong to young brown coal; And as higher in the moisture of state's brown coal such as Australia, Germany, Serbia, Indonesia abroad,Can be up to 70%.
The main path of brown coal utilization is at present by electric power stations near coal-mines combustion power generation, and brown coal and bituminous coal fired boiler are adopted moreBy unit pulverized-coal system, be generally using stove cigarette and hot blast mixture or hot blast as pulverized coal preparation system drier;Meager coal and anthracite adopt bin storage type pulverizing system more, 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 gases rowHigh-volume also larger. And, for high-moisture brown coal, adopt unit pulverized-coal system to make in wind of boilerContain the inert medias such as a large amount of stove cigarettes and water vapour, fire box temperature is low again in addition, and high-moisture brown coal are existedOutstanding combustion instability problem, causes boiler to be difficult to move safely and reliably, and this has seriously restricted both at home and abroadEffective utilization of high-moisture brown coal. Meanwhile, because brown coal reactivity is high, brown coal coal dust is inflammable and explosive, brownThe burning of coal pulverized coal preparation system and blast problem are also one and perplex brown coal unit safety reliability service for a long time alwaysOutstanding problem.
In addition the coal prognostic reserves that, are positioned at Xinjiang of China In The Eastern Junggar Basin " accurate eastern coalfield " reach 3900Hundred million tons is the self-contained coalfield of China's maximum. Accurate eastern coal is except thermal discharge is compared with brown coal height, other coal characteristicSimilar to brown coal, also there is moisture high (22～32%), volatile matter is high, ash fusion point is low, abrasiveness is low and easyThe feature of spontaneous combustion. The large-sized station boiler that current pin is in the industry aimed at eastern coal exploitation all adopts unit pulverized-coal system,Therefore for ensureing smooth combustion in pulverized coal preparation system drying capacity and stove, boiler all adopted very high hot blast temperature andPrimary air ratio. The result causing is thus the generally higher (exhaust gas temperature of exhaust gas temperature of these accurate eastern coal burning boilersGenerally more than 140 DEG C), correspondingly cause boiler thermal output and unit generation efficiency all lower; And, mistakeHigh primary air ratio makes low NO in stoveXOrganizing of burning is comparatively difficult, i.e. NO in furnace outlet flue gasXContentLarger, this has enlarged markedly pressure and the cost of the follow-up denitrating flue gas of boiler.
Further, in the boiler of burning high-moisture coal, emitted by combustible burning in coal in a large numberHeat is consumed in moisture in coal and is evaporated to water vapour, because these moisture are finally to discharge with Properties of SteamBoiler, quite a few that causes the actual heat release of fuel is wasted. Thereby, existing high-moisture fire coalIt is huge that boiler often shows as Coal-fired capacity, and the pollutant emission of unit generated energy is also obviously higher. If to characterizeThe high calorific power of the actual thermal discharge of fuel is benchmark boiler thermal output, high-moisture coal-burning boilerThe thermal efficiency is significantly lower than general low moisture coal-burning boiler.
On the other hand, China's brown coal major production areas (Eastern Inner Mongolia) and accurate eastern coal producing region (ground, XinjiangDistrict) be extremely water-deficient area. Because fired power generating unit need to consume large water gaging, water resources shortage becomesThereby these areas carry out primary restriction that power supply construction of base develops brown coal and accurate eastern coal resource because ofElement. But well-known, pulverized coal preparation system is also a drying system, for ensureing that breeze airflow enters stove simultaneouslyRear smooth combustion, requires pulverized coal preparation system that raw coal is dried to the coal dust moisture that moisture content is very low. Station boiler combustionCoal amount is huge, has entered burner hearth therefore a large amount of moisture in coal is evaporated to water vapour in pulverized coal preparation system with coal dust, becomesFor one of constituent of boiler smoke. In addition, thermal power plant is water for industrial use rich and influential family, and China's brown coalProducing region (for example Eastern Inner Mongolia) belongs to areas of serious mostly, and it is near coal-mine that water resources shortage becomes impactThe important restriction factor of power supply construction of base. Thereby, if moisture in coal can be reclaimed, to China's brown coalAnd accurate eastern coal utilization has very important ecological protection meaning. But because a large amount of dry flue gas in stove (are mainlyN2、CO2With excessive dry air) dilution, the water capacity of boiler exhaust gas and water dew point temperature are very low, this makesThereby become very difficult by the moisture in cooling boiler exhaust gas recovered flue gas. With certain combustion total moisture 40% brown coalIn-service 600MW unit be example, its boiler exhaust gas amount is 2800t/h, although smoke evacuation in contain 270t/h waterPoint, but smoke evacuation water dew point only has 53 DEG C (water vapour volume shares 15%). Visible, because dry flue gas amount is hugeLarge and water dew point is low, reclaiming moisture in smoke evacuation needs huge flue gas cooling heat exchanger and temperature enough low greatlyAmount cooling medium, this makes to reclaim moisture from smoke evacuation and water recovery latent heat is very difficult, so so farThereby there is not the engineering application that realizes the recovery of flue gas water and heat recovery by cooling power station boiler exhaust gas.
Summary of the invention
The present invention carries out in order to address the above problem, and object is to provide one to have outstanding water and reclaimsBenefit and energy-saving benefit, and can also improve the superheat steam drying powder process type coal generating system of generating efficiency.
The invention provides a kind of superheat steam drying powder process type coal generating system, for raw coal is burntTo drive generator generating, it is characterized in that, comprising: boiler unit, produces heat for raw coal is burntCan, and utilize heat energy that feedwater heating is obtained to high-temperature high-pressure steam, comprise: powder process subsystem, boiler mainLoom system, air-supply powder feeding subsystem and exhaust steam water reclaim subsystem; And Steam Turbine, utilize high temperatureThereby high-pressure water vapor acting drives generator generating, comprise for delivery of the feed pipe of feedwater, for delivery ofThe steam pipeline of high-temperature high-pressure steam and steam turbine, wherein, powder process subsystem comprises: for to raw coalThe vapour powder grinding and by drier, thereby raw coal is dried to formation vapour powder mixture generates dryInstall, vapour powder mixture is separated and obtains the vapour powder separator of coal dust and exhaust steam and generate drierDrier generating apparatus, boiler host subsystem is for being heated as high-temperature high-pressure steam by feedwater, bagContain: burner hearth, the stove inner flue being connected with furnace outlet, the coal burner that is positioned at burner hearth entry position,Air-supply powder feeding subsystem comprises: be connected with vapour powder separator for delivery of the machine supplying powder of coal dust, with to powderThe air and powder mixer that machine is connected, the wind mixing chamber being connected with air and powder mixer, be positioned at stove inner flueThe air preheater of afterbody and for the pressure fan of cold wind is provided, exhaust steam water reclaims subsystem and comprises: with giveThe exhaust steam apparatus for recovering that blower fan is connected and utilizes cold wind a part for exhaust steam to be carried out to condensation recovery, vapourPowder separator comprises: vapour powder mixture is separated to the coal collector that obtains coal dust and exhaust steam, and dryAgent generating apparatus comprises: be connected for delivery of the exhaust steam pipeline of exhaust steam with coal collector, be communicated with in exhaust steamOn pipeline for delivery of the exhaust steam circulating line of another part of exhaust steam, be connected to weary with exhaust steam circulating lineThereby the ducted exhaust steam of vapour cycle heat form as the exhaust steam heater of the superheated steam of drier,And drier is delivered to vapour powder generates the superheat steam pipeline circulating in drying device, exhaust steam heaterUtilize the condensation heat drawing gas of steam turbine to add thermosetting superheated steam to the exhaust steam in exhaust steam heater,Machine supplying powder is for delivery of coal dust to air and powder mixer, and air and powder mixer is to from air-supply powder feeding subsystem onceWind and coal dust are mixed to get wind powder mixture, and the exhaust steam in exhaust steam apparatus for recovering is provided by pressure fanThe cooling condensate water that becomes of cold wind, cold wind is obtained warm air by the heat preheating of exhaust steam in exhaust steam apparatus for recovering,Air preheater heats and obtains hot blast a part for warm air, another portion of a part for hot blast and warm airDivide after a wind mixing chamber mixes and enter in air and powder mixer as a wind, another part conduct of hot blastSecondary Air directly enters in coal burner, and coal burner burns to the coal dust in wind powder mixture,Coal dust and wind, a Secondary Air burn and generate flue gas in burner hearth.
In superheat steam drying powder process type coal generating system provided by the invention, can there is such spyLevy, also comprise: gas cleaning subsystem, be connected with the afterbody outlet of stove inner flue, comprise: connect successivelyThe deduster, air-introduced machine, desulfurizer, the chimney that connect.
In superheat steam drying powder process type coal generating system provided by the invention, can also have suchFeature: wherein, exhaust steam apparatus for recovering comprises: be communicated with exhaust steam output channel on exhaust steam pipeline, with wearyVapour output channel is connected and utilizes cold wind exhaust steam to be condensed into the air-cooled condenser of condensate water and to store recovery solidifyingThe water collector bearing water and be connected with exhaust steam output channel and exhaust steam directly introduced by the exhaust steam of desulfurizerRoad pipeline.
In superheat steam drying powder process type coal generating system provided by the invention, can also have suchFeature: wherein, exhaust steam water reclaims subsystem and also comprises: for delivery of the residual gas of air-cooled condenser outputResidual air conveying device, residual air conveying device comprises: be connected for remaining with the outlet of air-cooled condenserGas delivers into a residual air pipeline in wind mixing chamber and is connected with residual air pipeline and by residual gasBody directly introduce desulfurizer residual air bypass duct.
In superheat steam drying powder process type coal generating system provided by the invention, can also have suchFeature: wherein, vapour powder generates drying device and also comprises: raw coal is ground and be dried formation vapour powder mixtureCoal pulverizer and be connected with the outlet of coal pulverizer for the meal of vapour powder mixture is separated andSend meal back to mill separator in coal pulverizer.
In superheat steam drying powder process type coal generating system provided by the invention, can also have suchFeature: wherein, exhaust steam heater comprises: be connected with Steam Turbine for delivery of the extraction line drawing gas,For delivery of the hydrophobic drain water piping that returns to Steam Turbine that draws gas and form after exhaust steam heater condensation heat.
In superheat steam drying powder process type coal generating system provided by the invention, can also have suchFeature: wherein, vapour powder generates drying device and also comprises: outlet is connected with the entrance of coal pulverizer for to raw coalCarry out the predrying pipe of pre-dried raw coal and steam pipeline, the import of the predrying pipe of raw coal is defeated by steamSend pipe to be communicated on superheat steam pipeline, superheated steam as predry drying prescription to the raw coal in the predrying pipe of raw coalCarry out predrying.
In superheat steam drying powder process type coal generating system provided by the invention, can also have suchFeature: wherein, powder process subsystem also comprises: be connected for delivery of the gas transmission of gas with exhaust steam circulating linePipe and being located on appendix for controlling the control valve of opening and closing appendix, defeated by control valve controlTracheae is carried gas to exhaust steam circulating line, after gas is heated, as drier, after Preset Time, controlsValve control appendix processed stops carrying gas to exhaust steam circulating line.
In superheat steam drying powder process type coal generating system provided by the invention, can also have suchFeature: wherein, gas be in air or industrial inerting gas any one.
Effect and the effect of invention
In superheat steam drying powder process type coal generating system of the present invention, because powder process subsystem is with mistakeVapours is drier and the ventilation medium of powder process subsystem, and superheated steam generates drying device by vapour powderIn raw coal in the circulation exhaust steam that forms of moisture evaporation through heating shape with the condensation heat of extracted steam from turbineBecome, superheat steam temperature and flow meet respectively the requirement of powder process subsystem drying capacity and coal pulverizer ventilation,Except the circulation exhaust steam of periodic duty in powder process subsystem, because former moisture in coal does not constantly have at powder process subsystemAnother part exhaust steam of evaporating and produce carries out waste heat by exhaust steam water recovery subsystem and water reclaims.
The drier of the present invention taking superheated steam as powder process subsystem, makes whole powder process subsystem in complete inertingUnder atmosphere, move, ensured the safe and reliable operation of the high-volatile coal such as brown coal and accurate eastern coal powder process, solvePulverized coal preparation system burning and the blast problem of long-term puzzlement brown coal and accurate eastern coal unit safety reliability service. AndThe inside of having realized inertia powder process drier produces and recycling, does not need extra in pulverizing processSteam, nitrogen production system, do not need to consume other medium such as flue gas, hot blast yet, makes pulverizing process bothSafe and reliable, flow process is succinctly efficient again. And taking superheated steam as pulverized coal preparation system drier, improve in the pastThe pulverized coal particle particle size uniformity being caused by a large amount of explosions of coal grain in the dry and hot-air drying process of stove cigarette is poorProblem, thus contribute to improve coal powder performance, improve Combustion Efficiency of Coal Powder.
And the superheated steam in the present invention is to utilize extracted steam from turbine heating exhaust steam to obtain, i.e. exhaust steam heatingThermal source in device comes from the condensation heat that Steam Turbine is drawn gas, and the condensation heat drawing gas is effectively used inThe drying capacity of coal pulverizing system, also make the used heat that condenses of steam in Steam Turbine be had by steam generator systemEffect is utilized, and has significantly reduced the energy loss of Steam Turbine thermodynamic cycle. Thereby, apply this technical scheme alsoCan make power plant efficiency significantly improve, there is outstanding energy-saving benefit.
The present invention taking the inner water vapour producing of powder process subsystem as drier and defeated powder medium, makes several completelyThe water recovery that is the powder process exhaust steam of pure water steam becomes very easy. The cold wind of carrying by pressure fan is wearyIn carbonated drink retracting device, as the cooling exhaust steam of cooling medium, cold wind is preheated formation warm air, and warm air finally entersIn boiler, burn, the latent heat of condensation of a large amount of exhaust steam is effectively utilized by boiler, can significantly improve thusBoiler thermal output, the boiler thermal output that coal-fired power station boiler is calculated based on coal-fired low heat valve exceedes100% becomes possibility. And, the large water gaging money that exhaust steam apparatus for recovering is being realized waste heat recovery and realized simultaneouslyThe recovery and reuse in source, have immeasurable environment protection significance to rich coal water-deficient area especially.
The present invention carries out the separation of vapour powder by coal collector to vapour powder mixture and obtains low moisture coal dust, makesObtaining coal quantity significantly improves. This coal dust after drying and upgrading is sent into pot by uniform temperature airStove burns, and will there will be no the low combustion instability of temperature, low NO in stoveXBurning tissue burning difficulty waits asksTopic. Meanwhile, adopt pulverized coal carried by hot air that inert gas content in a wind is significantly reduced, breeze airflow thusIgnition heat reduces, and in a wind, oxygen concentration improves. Coefficient result is both to have improved breeze airflowCombustion stability and efficiency of combustion, also make the low NOx combustion of breeze airflow organize convenient, thus realExisting clean and effective smooth combustion. And this coal dust after drying and upgrading is by blowing in powder feeding subsystemA wind with uniform temperature is sent into boiler combustion, and water the raw coal evaporating from powder process subsystemDivide and no longer enter boiler with powder feeding medium, boiler exhaust gas amount is reduced in a large number, correspondingly exhaust gas temperatureAlso can reduce, finally make boiler exhaust gas heat loss significantly reduce, boiler thermal output obviously improves.
Therefore the superheat steam drying powder process type coal generating system that, the present invention can provide has outstanding water and returnsThe benefit of producing effects and energy-saving benefit, and can also improve generating efficiency.
Brief description of the drawings
Fig. 1 is the structured flowchart of superheat steam drying powder process type coal generating system in the embodiment of the present invention;
Fig. 2 is the structured flowchart of boiler unit in the embodiment of the present invention;
Fig. 3 is the structural representation of superheat steam drying powder process type coal generating system in the embodiment of the present invention;
Fig. 4 is the flow chart of superheat steam drying powder process type coal generating system in the embodiment of the present invention;
Fig. 5 is the block diagram of powder feeding subsystem of blowing in the embodiment of the present invention; And
Fig. 6 is the block diagram of powder process subsystem in the embodiment of the present invention.
Detailed description of the invention
For technological means, creation characteristic that the present invention is realized, reach object and effect is easy to understand,Following examples are in conjunction with the accompanying drawings and embodiments to the present invention relates to superheat steam drying powder process type coal generating systemBe described in detail.
Fig. 1 is the structured flowchart of superheat steam drying powder process type coal generating system in the embodiment of the present invention.
As shown in Figure 1, superheat steam drying powder process type coal generating system 100 comprises: boiler unit 501, vapourWheel unit 502 and generating set 503.
The heat that raw coal produces in 501 burnings of boiler unit adds the water vapour of thermosetting HTHP to waterEnter Steam Turbine 502 and do work, and then drive generating set 503 to generate electricity.
Fig. 2 is the structured flowchart of superheat steam drying powder process type coal generating system in the embodiment of the present invention.
As shown in Figure 2, boiler unit 501, comprising: powder process subsystem 401, boiler host subsystem 402,Air-supply powder feeding subsystem 403, exhaust steam water reclaim subsystem 404 and gas cleaning subsystem 405.
Air-supply powder feeding subsystem 403 forms respectively wind and Secondary Air after cold wind 2 is processed, wherein, and onceAfter mixing by a certain percentage, the coal dust that wind and powder process subsystem 401 grind formation to raw coal 1 sends into boiler mainIn loom system 402, the Secondary Air of air-supply powder feeding subsystem 403 directly enters in boiler host subsystem 402Participate in burning, in powder process subsystem 401, isolated a part of exhaust steam is transported to exhaust steam water and reclaims subsystem404 carry out water recovery, and exhaust steam is condensed into after condensate water and is recovered and recycles. And heat in exhaust steam(, water recovery heat release) carries out preheating to cold wind 2 (, boiler air-supply), makes by moisture in coalThe latent heat of condensation of a large amount of exhaust steam of evaporating and produce is made full use of by boiler, thereby significantly improves boiler thermal output.Another part exhaust steam is heated as superheated steam, conduct afterwards from the heat in the drawing gas of Steam Turbine 502Drier enters in powder process subsystem 401. The flue gas of boiler host subsystem 402 enters gas cleaning subsystem405 be cleaned after discharged to atmosphere.
Fig. 3 is the structural representation of superheat steam drying powder process type coal generating system in the embodiment of the present invention.
As shown in Figure 3, Steam Turbine 502 utilizes the heat energy producing in boiler unit 501 that feedwater heating is obtained to heightThereby temperature high-pressure water vapor drives generator unit 503. Steam Turbine 502 comprises feed pipe 61, steam is carriedPipe 62, steam turbine 60. Generating set 503 comprises generator 70. Generator 70 is connected with steam turbine 60, sends outMotor 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.It is dry for what raw coal 1 is ground and utilized drier generating apparatus generate that vapour powder generates drying deviceThereby agent is dried and forms vapour powder mixture raw coal 1, primary mixture is divided after entering vapour powder separatorFrom obtaining coal dust and exhaust steam, burning in boiler host subsystem 402 can be stored or directly be sent into gained coal dust,The major part of gained exhaust steam as the drier of powder process subsystem 401 and ventilation medium in powder process subsystem 401Periodic duty, another part exhaust steam is reclaimed after subsystem 404 is condensed into condensate water and is recovered profit again by exhaust steam waterWith.
Vapour powder generates drying device and comprises: run coal bin 5, feeder 6, coal pulverizer 7, mill separator 8. VapourPowder 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, thinWaterpipe 64 superheat steam pipelines 34, booster fan 35, appendix 52, control valve 51. Exhaust steam heater 33In thermal source come from the condensation heat drawing gas in steam turbine 60 in Steam Turbine 502, utilize steam turbine 60The heating exhaust steam of drawing gas obtains the superheated steam as drier. Wherein, draw gas and can directly extract steam turbine 60Middle temperature enough reaches exhaust steam heating the one-level of the required desiccant temperature of powder process subsystem draws gas, in addition,Multistage the drawing gas that also can extract different temperatures stress level of drawing gas progressively heated until powder process exhaust steamThe desiccant temperature that system is required.
Boiler host subsystem 402, for water is heated and obtains high-temperature high-pressure steam, comprising: boilerMain frame 24, coal burner 23. Boiler main frame 24 comprise burner hearth (not shown in FIG.) and with burner hearth smokeThe stove inner flue (not shown in FIG.) that mouth is connected. Burner hearth is used for making coal dust and air fully to burn heat release alsoAnd generation flue gas, is closing flue gas temperature of hearth outlet thereby the water-cooling wall of burner hearth circumference absorbs the heat of flue gasWithin suitable scope, in the later flue of furnace outlet, be furnished with carbonated drink heating surface, air preheater.
Air-supply powder feeding subsystem 403 comprises: machine supplying powder 12, pressure fan 14, warm air pipeline 55, air preheatDevice 15, Secondary Air hot air duct 16, wind-heat wind pipeline 17, warm air bypass duct 18, a wind are mixedClose chamber 19, wind booster fan 20, wind pipeline 21, powder feeding pipes 22, air and powder mixer 13.Air-cooled condenser 37 carries out forming warm air after preheating to cold wind 2, and then air preheater 15 is to warm airFurther heating obtains hot blast.
Exhaust steam water reclaims subsystem 404 and comprises: exhaust steam apparatus for recovering and residual air conveying device. Exhaust steam water returnsReceiving apparatus comprises: exhaust steam output channel 36, air-cooled 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, desulfurizer28 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 going out of coal collector 10Steam ports is connected with one end of exhaust steam pipeline 30, the import phase of the coal outlet of coal collector 10 and Pulverized Coal Bin 11Connect, the outlet of Pulverized Coal Bin 11 is connected with machine supplying powder 12, the powder inlet of machine supplying powder 12 and air and powder mixer 13Be connected, the outlet of air and powder mixer 13 is connected with one end of powder feeding pipes 22, the other end of powder feeding pipes 22Be connected with coal burner 23. Stove inner flue is connected with the outlet of burner hearth, and air preheater 15 is positioned at stoveThe afterbody of inner flue.
Air-cooled condenser 37 has refrigerant entrance and refrigerant exit, pressure fan 14 outlets and air-cooled condenser 37Refrigerant entrance be connected, the refrigerant exit of air-cooled condenser 37 is connected with one end of warm air pipeline 55,The other end of warm air pipeline 55 be connected with the air side import of air preheater 15 and with warm air bypass ductOne end of 18 is connected, and the air side outlet of air preheater 15 is respectively by Secondary Air hot air duct 16 HesOne time wind-heat wind pipeline 17 is connected with the air inlet of a wind mixing chamber 19 with coal burner 23. By warm airThe other end of road pipeline 18 is connected with the air inlet of a wind mixing chamber 19, wind mixing chamber 19 andInferior wind booster fan 20 is connected, and wind booster fan 20 is by wind pipeline 21 and air and powder mixer13 are connected.
The entrance of exhaust steam pipeline 30 is connected with the gas vent of coal collector 10. Exhaust steam blower fan 31 is located atOn exhaust steam pipeline 30, for extracting the exhaust steam of coal collector 10. The arrival end of exhaust steam circulating line 32Be connected with the outlet of exhaust steam pipeline 30, the entering of the port of export of exhaust steam circulating line 32 and exhaust steam heater 33Gas port is connected, and the gas outlet of exhaust steam heater 33 is connected with one end of superheat steam pipeline 34, overheatedThe other end of jet chimney 34 is connected with the entrance of booster fan 35, the outlet of booster fan 35 and coal-grindingMachine 7 is connected. Appendix 52 is connected with exhaust steam circulating line 32, and control valve 51 is located on appendix 52Be used for controlling opening and closing appendix 52.
The entrance of exhaust steam output channel 36 is communicated with on exhaust steam pipeline 30, the outlet of exhaust steam output channel 36 withThe import of air-cooled condenser 37 is connected, and exhaust steam bypass duct 41 is in parallel with air-cooled condenser 37, and condensate water is returnedReceive device 40 and be connected with air-cooled condenser 37, for storing the condensate water being reclaimed by air-cooled condenser 37, windThe residual air outlet of cold condenser 37 is connected with the import of air ejector 38, and the outlet of air ejector 38 connects respectivelyOne end of one end of residual air pipeline 39 and residual air bypass duct 42, the other end of residual air bypass duct 42 connectsDesulfurizer 28, the other end of residual air pipeline 39 connects a wind mixing chamber 19. Through air-cooled condenser 37Remaining incondensable gas (hereinafter to be referred as residual gas) after recycle-water steam, this residual gas is through excess enthalpyFeed channel 39 enters a wind mixing chamber 19 and enters in burner hearth as a wind, and making may in residual gasThe fuel gas containing is abundant after-flame in burner hearth, and in addition, residual gas also can pass through residual air bypass duct42 enter in desulfurizer 28. This residual gas is other the incoagulable gas mixing in water vapour, for exampleSeepage is entered the air of exhaust steam apparatus for recovering and the fuel gas that raw coal 1 volatilizes in pulverizing process.
Between outlet, deduster 25, air-introduced machine 27, desulfurizer 28 and the chimney 29 of stove inner flue in turnBe connected by smoke discharging pipe 26.
One end of feed pipe 61 of Steam Turbine 502 and being connected to water out of Steam Turbine 502, anotherEnd is connected with boiler host subsystem 402, one end boiler host subsystem 402 phases of steam pipeline 62Connect, the other end is connected with the steam inlet of Steam Turbine 502, and steam turbine 60 is by extraction line 63Be connected with the import of exhaust steam heater 33, and Steam Turbine 502 adds by drain water piping 64 and exhaust steamThe outlet of hot device 33 is connected, and drawing gas of extracting out from steam turbine 60 enters exhaust steam heating by extraction line 63In device 33, exhaust steam is heated, drawing gas afterwards, formation is hydrophobic flows back into Steam Turbine by drain water piping 64502。
Fig. 4 is the flow chart of superheat steam drying powder process type coal generating system in the embodiment of the present invention.
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, formerCoal 1 is at the interior coal dust that ground into of coal pulverizer 7, entered after the desiccant dryness of coal pulverizer 7 from coal-grinding simultaneouslyOutput in machine 7, the exhaust steam that coal pulverizer 7 exports and the mixture of coal dust are, vapour powder mixture divides through mealDuring from device 8, meal is separated and reenters in coal pulverizer 7 and again grinds. Separate through mealThe vapour powder mixture of device 8 enters coal collector 10 by powder process pipeline 9, and coal collector 10 is mixed by vapour powderExhaust steam and coal dust in compound are isolated, and Pulverized Coal Bin 11 is stored coal dust, the coal dust in Pulverized Coal Bin 11Send into air and powder mixer 13 by machine supplying powder 12, in air and powder mixer 13 with from a wind mixing chamber 19Wind mixes, and is then sent to coal burner 23 by powder feeding pipes 22 and enters in burner hearth together with Secondary AirBurning heated feed water.
Fig. 5 is the block diagram of powder feeding subsystem of blowing in the embodiment of the present invention.
The flow process (step S4) of air: as shown in Fig. 3, Fig. 4 and Fig. 5, cold wind 2 (, boiler air-supply)Send into the exhaust steam for cooling air condenser 37 as cooling medium of air-cooled condenser 37 by pressure fan 14,Simultaneously cold wind 2 forms warm air after by the heat preheating of exhaust steam, and part warm air enters air by warm air pipeline 55Preheater 15 is interior is further added thermosetting hot blast by flue gas. The hot blast of air preheater 15 air side outlets is largePart is directly drawn toward coal burner 23 through Secondary Air hot air duct 16 as Secondary Air. Another small part hot blastThe warm air of carrying with warm air bypass duct 18 is mixed to form one time wind, temperature in a wind mixing chamber 19The warm air that wind bypass duct 18 is carried can regulate the temperature of a wind, and wind is through by a wind booster fanAfter supercharging, enter air and powder mixer 13 through wind pipeline 21 once, and then coal dust is sent in burner hearth and burnt.
Flue gas flow: coal dust and air generate flue gas at the stove chamber inner combustion of boiler 19, the flue gas in burner hearth fromStove inner flue is discharged, and at stove inner flue afterbody, air preheater 15 is heated, and the flue gas of discharge is through dedustingAfter device 25 purifies, enter air-introduced machine 27 by smoke discharging pipe 26, enter afterwards in desulfurizer 28, through de-Sulphur purify flue gas 3 by chimney 29 discharged to atmospheric environment.
Fig. 6 is the block diagram of powder process subsystem in the embodiment of the present invention.
As shown in Figure 6, water vapour flow process (S6-1, S6-2): by the water vapour in powder process subsystem 401 byThe moisture evaporation composition of raw coal 1. Between coal pulverizer 7 outlets and the air inlet of exhaust steam heater 33, be called wearyVapour is called superheated steam between exhaust steam heater 33 gas outlets and coal pulverizer 7 entrances. Exhaust steam and coal dust existIn coal collector 10, separate, 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 added thermosetting superheated steam, shouldSuperheated steam is sent into coal pulverizer 7 as drier through superheat steam pipeline 34, to entering the former of coal pulverizer 7Coal 1 is dried, and the vapour powder mixture that coal pulverizer 7 exports is isolated coal dust and exhaust steam by coal collector 10Composition, the water composition that exhaust steam is now evaporated by the superheated steam as drier and raw coal 1, from coalA part for the exhaust steam that powder collector 10 ventholes are discharged enters exhaust steam heater 33 and exists as drierThe interior circulation of powder process subsystem 401, a part of exhaust steam is sent into air-cooled condenser 37 through exhaust steam output channel 36 in additionReclaim. Exhaust steam is cooled by cold wind 2 air-cooled condenser 37 is interior, thereby obtains a large amount of condensate water,Condensate water combines in water collector 40.
The flow process (S5) of feedwater: water forms high temperature after being heated by boiler host subsystem 402 through feed pipe 61High-pressure water vapor, high-temperature high-pressure steam is sent in Steam Turbine 502 and is done work through steam pipeline 62,Steam Turbine 502 drives generator 70 to work. The heat regenerative system of drawing gas in Steam Turbine 502 is extracted part out and is taken outVapour, this draws gas the exhaust steam in exhaust steam heater 33 is heated, and produces the superheated steam as drier.
The residual gas that exhaust steam apparatus for recovering is discharged after water vapour is reclaimed is defeated respectively through residual air conveying deviceDeliver in a wind mixing chamber 19 or in desulfurizer 28. In the time that this residual gas contains fuel gas,Close the valve on residual air bypass duct 42, make this residual gas all pass through residual air pipeline 39 and enter in burner hearthBurn; In the time that this residual gas does not contain fuel gas, close the valve on residual air pipeline 39, make thisResidual gas is discharged after gas cleaning subsystem 405.
In the present embodiment, first, control steam appendix 52 to exhaust steam circulating line by control valve 5132 carry gases 50, after gas 50 is heated as drier to entering raw coal 1 and the coal in coal pulverizer 7Powder is dried, and then, after Preset Time, control valve 51 is controlled steam appendix 52 and stopped to exhaust steamCirculating line 32 is carried gas 50, and the valve of simultaneously opening on exhaust steam circulating line 32 is set up exhaust steam recirculation.After operation a period of time, the gas 50 of being inputted by steam appendix 52 is progressively discharged by exhaust steam output channel 36,Making drier convergence is pure water steam and containing other assorted gas, so having realized pure water steam is drier pairCoal dust is dried.
The effect of embodiment and effect
In the superheat steam drying powder process type coal generating system of the present embodiment, powder process subsystem is with overheatedSteam is powder process subsystem drier and coal pulverizer ventilation medium, and superheated steam is exported because of water in coal by coal pulverizerDivide the circulation exhaust steam warp of evaporation formation to draw gas in Steam Turbine as the exhaust steam heater heating shape of heat mediumBecome, superheat steam temperature and flow meet respectively the requirement of powder process subsystem drying capacity and coal pulverizer ventilation,Except the circulation exhaust steam of periodic duty in powder process subsystem, because moisture in coal constantly steams in powder process subsystemAnother part output exhaust steam of sending out and produce, is reclaimed in subsystem taking boiler air-supply as cooling medium by exhaust steam waterCarry out waste heat and water and reclaim, the heat in exhaust steam is simultaneously for preheating cold wind.
And the superheated steam in the present embodiment is to utilize extracted steam from turbine heating exhaust steam to obtain, i.e. exhaust steam addsThermal source in hot device comes from the condensation heat that Steam Turbine is drawn gas, and the condensation heat drawing gas is effectively utilizedIn the drying capacity of coal pulverizing system, also make the used heat that condenses of steam in Steam Turbine by steam generator systemEffectively utilize, significantly reduced the cold source energy of Steam Turbine thermodynamic cycle.
In datonation-inhibition inert gas flue gas, nitrogen and the water vapour of commonly using in industry, water vapour has best pressing downQuick-fried performance. The drier of the present embodiment taking superheated steam as powder process subsystem, makes whole powder process subsystem completeUnder full inerting atmosphere, move, ensured the safe and reliable operation of the high-volatile coal such as brown coal and accurate eastern coal powder process,Pulverized coal preparation system burning and the blast problem of long-term puzzlement brown coal and accurate eastern coal unit safety reliability service are solved.And the inside of having realized inertia powder process drier produces and recycling, does not need volume in pulverizing processOuter steam, nitrogen production system, do not need to consume other medium such as flue gas, hot blast yet, makes powder processJourney is both safe and reliable, and flow process is succinctly efficient again. And taking superheated steam as pulverized coal preparation system drier, improveThe pulverized coal particle particle size uniformity in the past being caused by a large amount of explosions of coal grain in the dry and hot-air drying process of stove cigarettePoor, thus contribute to improve coal powder performance, improve Combustion Efficiency of Coal Powder.
The present embodiment taking the inner water vapour producing of powder process subsystem as drier and defeated powder medium, makes completelyThe waste heat and the water recovery that are almost the powder process exhaust steam of pure water steam become very easy. Defeated by boiler fanThe cold wind sending is as the cooling exhaust steam of cooling medium in exhaust steam apparatus for recovering, and cold wind is preheated formation warm air,Warm air finally enters in boiler and burns, and the latent heat of condensation of a large amount of exhaust steam is effectively utilized by boiler, byThis can significantly improve boiler thermal output, the boiler that coal-fired power station boiler is calculated based on coal-fired low heat valveThe thermal efficiency exceedes 100% becomes possibility. And, exhaust steam apparatus for recovering realize waste heat recovery simultaneously institute realizeThe recovery and reuse of great lot of water resources, especially rich coal water-deficient area is had to immeasurable environment protection significance.
The present embodiment carries out the separation of vapour powder by coal collector to vapour powder mixture and obtains low moisture coal dust,Coal quantity is significantly improved. This coal dust after drying and upgrading is sent into by uniform temperature airBoiler burns, and will there will be no the low combustion instability of temperature, low NO in stoveXBurning tissue burning difficulty etc.Problem. Meanwhile, adopt pulverized coal carried by hot air that inert gas content in a wind is significantly reduced, coal dust gas thusStream ignition heat reduces, and in a wind, oxygen concentration improves. Coefficient result is both to have improved coal dust gasCombustion stability and the efficiency of combustion of stream, also make the low NOx combustion of breeze airflow organize convenient, therebyRealize clean and effective smooth combustion. And this coal dust after drying and upgrading is by the powder feeding subsystem of blowingIn there is uniform temperature a wind send into boiler combustion, and the raw coal evaporating from powder process subsystemMoisture no longer enters boiler with powder feeding medium, boiler exhaust gas amount is reduced in a large number, correspondingly boiler exhaust gas temperatureDegree also can reduce, and finally makes boiler exhaust gas heat loss significantly reduce, and boiler thermal output obviously improves.
In the present embodiment, because residual air conveying device is sent the fuel gas that may contain in water vapour back to potIn stove, burn, thereby fully ensured 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, has solved the coal-fired pot of high-moistureThe problem of stove combustion instability, has overcome the inefficient shortcoming of traditional high-moisture coal-fired boiler hot, is significantly carryingThereby when high boiler thermal output, make powder process subsystem move and improve high volatile coal under inerting atmosphereThe safety in operation of powder process subsystem, more outstanding, make water in coal using superheated steam as drierThe very easily Project Realization of recovery of dividing also can further improve combustion by the recycling of steam condensation waste heat simultaneouslyCoal power generation system effectiveness, thereby superheat steam drying powder process type coal generating system of the present invention has highly significantEnergy-saving benefit and environment protection significance.
Certainly superheat steam drying powder process type coal generating system involved in the present invention is not merely defined inStructure in above-described embodiment. Above content is only the basic explanation of the present invention under conceiving, and according to the present inventionAny equivalent transformation of doing of technical scheme, all should belong to protection scope of the present invention.
Above-mentioned embodiment is preferred case of the present invention, is not used for limiting the scope of the invention.
The gas that appendix is carried can be air, also can directly carry water vapour, nitrogen, flue gas etc. lazyIn oxidizing gases any one.
In the time that former moisture content of coal is higher, the predrying pipe of raw coal can also be set between coal pulverizer and feeder, formerThe import of the predrying pipe of coal is communicated on superheat steam pipeline by steam pipeline, and steam pipeline is by partSuperheated steam is transported in the predrying pipe of raw coal and directly contacts with raw coal, thereby raw coal is carried out predrying, logicalCrossing superheated steam has realized raw coal dry safely.
Predry drying prescription in the predrying pipe of raw coal can be not only the overheated steaming of part of carrying by steam pipelineVapour, can be also that superheat steam pipeline is directly connected with the entrance point of the predrying pipe of raw coal, superheated steam processThe predrying pipe of raw coal carries out entering coal pulverizer after predrying to raw coal vapour powder mixture is further dried.
Claims (9)
1. a superheat steam drying powder process type coal generating system, for burning to drive generator to raw coalGenerating, is characterized in that, comprising:
Boiler unit, produces heat energy for described raw coal is burnt, and utilizes described heat energy that feedwater is addedHeat obtains high-temperature high-pressure steam, comprises: powder process subsystem, boiler host subsystem, air-supply powder feeding subsystemSystem and exhaust steam water reclaim subsystem; And
Steam Turbine, thus utilize described high-temperature high-pressure steam acting to drive described generator generating, compriseFor delivery of the feed pipe of described feedwater, for delivery of steam pipeline and the vapour of described high-temperature high-pressure steamTurbine,
Wherein, described powder process subsystem comprises: for described raw coal being ground and by drier pairThereby described raw coal is dried the vapour powder of formation vapour powder mixture and generates drying device, described vapour powder is mixedThing separates the drier that obtains the vapour powder separator of coal dust and exhaust steam and generate described drier and generatesDevice,
Described boiler host subsystem, for described feedwater is heated as to described high-temperature high-pressure steam, comprises:Burner hearth, the stove inner flue being connected with described furnace outlet, the coal dust firing that is positioned at described burner hearth entry positionDevice,
Described air-supply powder feeding subsystem comprises: be connected with described vapour powder separator for delivery of coal dust toPowder machine, the air and powder mixer being connected with described machine supplying powder, the wind being connected with described air and powder mixerMixing chamber, be positioned at the air preheater of described stove inner flue afterbody and for the pressure fan of cold wind is provided,
Described exhaust steam water reclaims subsystem and comprises: be connected with described pressure fan and utilize described cold wind to instituteA part of stating exhaust steam is carried out the exhaust steam apparatus for recovering of condensation recovery,
Described vapour powder separator comprises: to described vapour powder mixture separate obtain described coal dust and described inThe coal collector of exhaust steam,
Described drier generating apparatus comprises: be connected for delivery of described exhaust steam with described coal collectorExhaust steam pipeline, be communicated with the exhaust steam circulation pipe for delivery of another part of described exhaust steam on described exhaust steam pipelineRoad, be connected with described exhaust steam circulating line to the described exhaust steam in described exhaust steam circulating line heat fromAnd form as the exhaust steam heater of the superheated steam of drier and described drier is delivered to described vapour powderGenerate the superheat steam pipeline circulating in drying device,
The condensation heat drawing gas that described exhaust steam heater utilizes described steam turbine is in described exhaust steam heaterExhaust steam adds superheated steam described in thermosetting,
Described machine supplying powder for delivery of described coal dust to described air and powder mixer,
Described air and powder mixer mixes wind from described air-supply powder feeding subsystem and described coal dustObtain wind powder mixture,
Cooling the becoming of described cold wind that exhaust steam in described exhaust steam apparatus for recovering is provided by described pressure fan condensesWater, described cold wind is obtained warm air by the heat preheating of described exhaust steam in described exhaust steam apparatus for recovering,
Described air preheater heats and obtains hot blast a part for described warm air, of described hot blastDescribed in point entering as a described wind after a described wind mixing chamber mixes with another part of described warm airIn air and powder mixer, 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 a described wind, 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, alsoComprise:
Gas cleaning subsystem, is connected with the afterbody outlet of described stove inner flue, comprises: connect successivelyDeduster, 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 exhaust steam output channel on described exhaust steam pipeline,Be connected with described exhaust steam output channel and utilize described cold wind described exhaust steam to be condensed into the air-cooled condensing of condensate waterDevice and store reclaim described condensate water water collector and be connected with described exhaust steam output channel and incite somebody to action described inThe exhaust steam bypass duct of described desulfurizer is directly introduced in exhaust steam.
4. superheat steam drying powder process type coal generating system according to claim 3, is characterized in that:
Wherein, described exhaust steam water recovery subsystem also comprises: for delivery of remaining of described air-cooled condenser outputThe residual air conveying device of residual air body,
Described residual air conveying device comprises: be connected with the outlet of described air-cooled condenser for by described residueGas deliver into the residual air pipeline in a described wind mixing chamber and be connected with described residual air pipeline andBy described residual gas directly introduce 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 generates drying device and also comprises: described raw coal is ground and be dried described in formationThe coal pulverizer of vapour powder mixture and being connected with the outlet of described coal pulverizer for to described vapour powder mixtureMeal separate and send 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 and draw gas for delivery of describedExtraction line, for delivery of the described hydrophobic institute that returns of drawing gas and forming after described exhaust steam heater condensation heatState the drain water piping of Steam Turbine.
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 be connected with the entrance of described coal pulverizer forDescribed raw coal is carried out to the predrying pipe of pre-dried raw coal and steam pipeline,
The import of the predrying pipe of described raw coal is communicated to described superheat steam pipeline by described steam pipelineIt is upper,
Described superheated steam carries out predry as predry drying prescription to the described raw coal in the predrying pipe of described raw coalDry.
8. according to the superheat steam drying powder process type coal generating system described in any one in claim 1 to 7,It is characterized in that:
Wherein, described powder process subsystem also comprises: be connected for delivery of gas with described exhaust steam circulating lineAppendix and be located on described appendix the control valve for controlling appendix described in opening and closing,
Carry described gas by appendix described in described control valve control to described exhaust steam circulating line, described inAfter gas is heated, as described drier, after Preset Time, described in described control valve control, appendix stopsOnly carry 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.
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| JP2011214562A (en) * | 2010-04-02 | 2011-10-27 | Mitsubishi Heavy Ind Ltd | Coal gasification combined power generation system |
| CN201697441U (en) * | 2010-07-12 | 2011-01-05 | 山东天力干燥设备有限公司 | Indirect heat exchanging drying low-rank coal utilization system of pumped steam of thermal power plant |
| CN101852540B (en) * | 2010-07-12 | 2012-07-04 | 山东天力干燥股份有限公司 | Comprehensive utilization system for drying low-order coal of thermal power plant in steam pumping and indirect heat exchanging way and process thereof |
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| CN102353237B (en) * | 2011-08-18 | 2013-12-11 | 西安交通大学 | High-moisture-content lignite predrying method and system integrated with thermal power plant |
| CN102410552B (en) * | 2011-09-21 | 2013-12-11 | 西安交通大学 | Large-scale centralized preparation system for pulverized coal and distribution method |
| CN202532843U (en) * | 2012-05-02 | 2012-11-14 | 曾永健 | High-moisture brown coal pre-drying system for coal-fired power plant |
| CN202884958U (en) * | 2012-11-09 | 2013-04-17 | 中国神华能源股份有限公司 | Brown coal thermal power generation system |
| CN103968659B (en) * | 2013-01-24 | 2016-08-03 | 天华化工机械及自动化研究设计院有限公司 | A kind of utilize coal to be dried steam discharge to reduce Thermal generation unit coal consumption and the method for Water Sproading |
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| CN104132362A (en) * | 2014-07-31 | 2014-11-05 | 上海理工大学 | Open powder making steam warm air type boiler unit and power generation system thereof |
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