CN104329666B - 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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- CN104329666B CN104329666B CN201410639762.6A CN201410639762A CN104329666B CN 104329666 B CN104329666 B CN 104329666B CN 201410639762 A CN201410639762 A CN 201410639762A CN 104329666 B CN104329666 B CN 104329666B
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K1/00—Preparation of lump or pulverulent fuel in readiness for delivery to combustion apparatus
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C21/00—Disintegrating plant with or without drying of the material
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K11/00—Plants characterised by the engines being structurally combined with boilers or condensers
- F01K11/02—Plants characterised by the engines being structurally combined with boilers or condensers the engines being turbines
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K3/00—Feeding or distributing of lump or pulverulent fuel to combustion apparatus
- F23K3/02—Pneumatic feeding arrangements, i.e. by air blast
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L15/00—Heating of air supplied for combustion
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/005—Drying-steam generating means
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Abstract
The present invention provides a kind of superheat steam drying powder process type coal generating system, for raw coal being carried out the rear drive electrical power generators that burns, including: 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 segregation apparatus and desiccant generating means, boiler host subsystem comprises: burner hearth, stove inner flue, coal burner, exhaust steam Water Sproading subsystem comprises: is connected with steam turbine and utilizes the low-temperature condensate of steam turbine that a part for exhaust steam carries out the exhaust steam apparatus for recovering that condensation is reclaimed, desiccant generating means comprises: exhaust steam heater, and desiccant is delivered in vapour powder generation drying device the superheat steam pipeline being circulated, exhaust steam heater utilizes the flue gas from burner hearth that the exhaust steam exhaust steam heater is thermally formed the superheated steam as desiccant.
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,
The superheat steam drying powder process type coal generating system of moisture in coal recovery technology.
Background technology
China is the country of a rich coal few oil deficency, and coal is constantly in core master in China's energy supply
Leading status, within following considerably long period, the energy resource structure based on coal can be sustained in China.
Because coal fired power plant has the advantages that to be concentrated use in coal on a large scale, be conducive to accomplishing efficient, clean utilization coal
Charcoal, thus coal is at home and abroad mainly used in generating.At present in China, the 55% of coal total output is for fire coal
Thermal power generation, and in terms of power supply architecture, thermal power generation is the main generation mode of China, the electricity of China about 80%
Power supply comes from fired power generating unit.China newly builds a power station still based on coal fired power plant at present, and electricity coal is total at coal
Ratio in yield the most quickly increases.But, coal fired power generation also discharges substantial amounts of while producing electric power
Pollutant, including SO2, flue dust, NOXAnd CO2Deng；And, the generating net efficiency of China's coal fired power plant and send out
Reach country to compare and still have bigger gap.Thus, improve efficiency of energy utilization further thus both reduced the energy and disappeared
Consumption reduces again pollutant emission, becomes China's power industry or even whole national economy realizes sustainable development
The most urgent important task.
In recent years, along with power coal price quickly go up and high-quality coal reserves in coal gross reserves ratio by
Gradually decline, utilize high water content brown coal combustion power generation to become the outstanding problem that power industry pays high attention to.Entirely
In world wide, brown coal account for the 40% of world's coal gross reserves, China's brown coal reserves 290,000,000,000 tons, account for
The 16% of domestic coal gross reserves.Brown coal are the coals that degree of coalification is minimum, have that moisture is high, volatile matter high,
Calorific value is low, the feature such as the easy spontaneous combustion of easy-weathering in atmosphere, so being difficult to store, and also unsuitable long-distance transportation.
The 3/4 of China's brown coal is distributed in the Inner Mongol and the Northeast, and these brown coal total moistures, 25～40%, belong to old age
Brown coal；Remaining brown coal is mainly distributed on Yunnan Province, and these brown coal total moistures are 40～60%, containing wood fibre,
Belong to young brown coal；And the moisture of state's brown coal such as external such as Australia, Germany, Serbia, Indonesia is higher,
May be up to 70%.
The main path that brown coal utilize at present is by electric power stations near coal-mines combustion power generation, and brown coal are adopted with bituminous coal fired boiler more
By unit pulverized-coal system, it is usually using stove cigarette and hot blast mixture or hot blast as pulverized coal preparation system desiccant；
Meager coal and anthracite many employings bin storage type pulverizing system, be usually using hot blast as pulverized coal preparation system desiccant.
But compared with conventional bituminous coal fired boiler, these boiler using brown coal thermals efficiency are low, the big price of volume high, greenhouse gases row
The biggest.And, for high water content brown coal, use unit pulverized-coal system to make in boiler First air
Containing inert medias such as a large amount of stove cigarettes and water vapour, fire box temperature is the lowest in addition so that high water content brown coal exists
Prominent combustion instability problem, causes boiler to be difficult to safely and reliably and runs, and this seriously constrains both at home and abroad
Effective utilization of high water content brown coal.Simultaneously as brown coal reactivity is high, brown coal coal dust is inflammable and explosive, brown
The burning of coal pulverized coal preparation system and explosion issues are also long-term puzzlement lignite-fired unit safe and reliable operations always
Outstanding problem.
Additionally, the coal prognostic reserves being positioned at Xinjiang of China In The Eastern Junggar Basin " coalfield, quasi-east " reach 3900
Hundred million tons, be the self-contained coalfield of China's maximum.Quasi-east coal in addition to thermal discharge relatively brown coal height, other coal characteristic
Similar to brown coal, it may have moisture high (22～32%), volatile matter is high, ash fusion point is low, abrasiveness is low and easy
The feature of spontaneous combustion.The large-sized station boiler of pin alignment east coal exploitation all uses unit pulverized-coal system the most in the industry,
Therefore for burning stable in ensureing pulverized coal preparation system drying capacity and stove, boiler all have employed the highest hot blast temperature and
Primary air ratio.The result thereby resulted in is the universal higher (exhaust gas temperature of exhaust gas temperature of these quasi-east coal burning boilers
General more than 140 DEG C), correspondingly cause boiler thermal output and unit generation efficiency the most relatively low；And, mistake
High primary air ratio is low NO in making stoveXThe tissue of burning is the most difficult, i.e. NO in furnace outlet flue gasXContent
Relatively big, this pressure significantly increasing the follow-up denitrating flue gas of boiler and cost.
In recent years, thermal power industry extensive concern is improved further by the deep exploitation of boiler exhaust gas waste heat
Power plants generating electricity efficiency, typical mode is layout low-pressure coal saver in boiler exhaust gas flue, utilizes smoke evacuation remaining
The unit of heat heating low temperature condenses water, thus reduces the low-pressure heater amount of drawing gas, and reaches to improve power plant efficiency
Purpose.Obviously, utilizing the feature that unit condensing water temperature is low to carry out waste heat recovery is that generating efficiency improves in power plant
Thus one of obtain the effective way of energy-saving and emission-reduction benefit, but because the coefficient of heat transfer of flue gas is low, in addition flue gas with
Condense the heat transfer temperature difference between water less so that the low-pressure coal saver being condensed water by flue gas is bulky,
Investment payback time is longer, and arranges more difficulty in power plant.
On the other hand, China's brown coal major production areas (Eastern Inner Mongolia) and (ground, Xinjiang, coal producing region, quasi-east
District) it is extreme dehydration area.Owing to fired power generating unit needs to consume a large amount of water, water resources shortage has become as
These areas carry out power supply construction of base thus develop brown coal and quasi-east coal resource primarily restrict because of
Element.It is well known, however, that pulverized coal preparation system is also a drying system, for ensureing that breeze airflow enters stove simultaneously
Rear stable burning, it is desirable to raw coal is dried to the lowest coal dust moisture of moisture content by pulverized coal preparation system.Station boiler fires
Coal amount is huge, therefore a large amount of moisture in coal is evaporated to water vapour in pulverized coal preparation system and enters burner hearth with coal dust, becomes
One of constituent for boiler smoke.It 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 it is near coal-mine that water resources shortage becomes impact
The important restriction factor of power supply construction of base.Thus, if moisture in coal can be reclaimed, to China's brown coal
And quasi-east coal utilization has very important ecological protection meaning.But due to dry flue gas a large amount of in stove (mainly
N2、CO2And excess dry air) dilution, water capacity and the aqueous dew point temperature of boiler exhaust gas are the lowest, and this makes
Become extremely difficult by cooling boiler exhaust gas thus moisture in recovered flue gas.Total moisture 40% brown coal are fired with certain
In-service 600MW unit as a example by, its boiler exhaust gas amount is 2800t/h, although containing 270t/h water in smoke evacuation
Point, but smoke evacuation water dew point only has 53 DEG C (water vapour volume shares 15%).Visible, owing to dry flue gas amount is huge
Big and water dew point is low, reclaiming moisture in smoke evacuation needs huge flue gas cooling heat exchanger and of a sufficiently low big of temperature
Amount cooling medium, it is extremely difficult with water recovery latent heat that this makes to reclaim moisture from smoke evacuation, so so far
Do not have by cooling station boiler smoke evacuation thus realize the engineer applied of flue gas Water Sproading and heat recovery.
Summary of the invention
The present invention is carried out to solve the problems referred to above, it is therefore intended that provide one to have prominent Water Sproading
Benefit and energy-saving benefit, but also can guarantee that pulverized coal preparation system safe operation and the higher superheated steam of efficiency of fire coal
It is dried powder process type coal generating system.
The present invention provides a kind of superheat steam drying powder process type coal generating system, for burning raw coal
To drive electrical power generators, it is characterised in that including: boiler controller system, produce heat for raw coal being carried out burning
Can, and utilize heat energy that feedwater heating is obtained high-temperature high-pressure steam, comprise: powder process subsystem, boiler main
Loom system, air-supply powder feeding subsystem and exhaust steam Water Sproading subsystem；And Steam Turbine, utilize high temperature
High-pressure water vapor does work thus drives electrical power generators, comprises 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 former
Coal is carried out grinding and is dried raw coal by desiccant thus forms the vapour powder of vapour powder mixture and generate dry
Dry device, vapour powder mixture is carried out isolated coal dust and exhaust steam (exhaust steam: general by Air Dried System
The cryogenic gas discharged is referred to as weary gas, is accustomed to lifting manipulation according to this, the most often claims coal pulverizer to go out in boiler milling system
Mouth expellant gas is weary gas, because in the present invention, pulverized coal preparation system is with water vapour for desiccant and defeated powder medium,
Therefore coal pulverizer outlet vapour powder mixture in water vapour be called exhaust steam) vapour powder segregation apparatus and generate be dried
The desiccant generating means of agent, boiler host subsystem is used for feedwater is heated as high-temperature high-pressure steam,
Comprise: stove inner flue that burner hearth is connected with furnace outlet, be positioned at the coal burner of burner hearth entry position,
Air-supply powder feeding subsystem comprises: be connected with vapour powder segregation apparatus for the machine supplying powder of pulverized coal conveying and to powder
First air mixing chamber that the air and powder mixer that machine is connected is connected with air and powder mixer, it is positioned at stove inner flue
The air preheater of afterbody and for providing the pressure fan of environment cold wind, exhaust steam Water Sproading subsystem comprises:
It is connected with Steam Turbine and utilizes the low-temperature condensate of Steam Turbine that a part for exhaust steam is condensed back
Receive exhaust steam apparatus for recovering, vapour powder segregation apparatus comprises: vapour powder mixture is carried out isolated coal dust and
The coal collector of exhaust steam, desiccant generating means comprises: be connected for carrying exhaust steam with coal collector
Exhaust steam pipeline, connection on exhaust steam pipeline for carry exhaust steam another part exhaust steam circulating line and
Exhaust steam circulating line is connected and heats the exhaust steam in exhaust steam circulating line thus formed as desiccant
The exhaust steam heater of superheated steam and desiccant is delivered to vapour powder generates the mistake being circulated in drying device
Vapours pipeline, exhaust steam heater utilizes the flue gas of burner hearth to be thermally formed the exhaust steam in exhaust steam heater
Superheated steam, machine supplying powder is for pulverized coal conveying to air and powder mixer, and air and powder mixer is to from air-supply powder feeding
The First air of system and coal dust carry out being mixed to get wind powder mixture, and the exhaust steam in exhaust steam apparatus for recovering is by vapour
The low-temperature condensate condensation of wheel unit becomes condensation water, and a part for environment cold wind is added by air preheater
Heat obtains hot blast, another part conduct after First air mixing chamber mixes of a part for hot blast and environment cold wind
First air enters in air and powder mixer, and another part of hot blast is directly entered in coal burner as secondary wind,
Coal dust in wind powder mixture is burnt by coal burner, and coal dust and First air, secondary wind are in burner hearth
Burning generates flue gas.
In the superheat steam drying powder process type coal generating system that the present invention provides, can have such spy
Levy, also include: gas cleaning subsystem, export with the afterbody of stove inner flue and be connected, comprise: connect successively
The cleaner unit that connects, air-introduced machine, desulfurizer, chimney.
In the superheat steam drying powder process type coal generating system that the present invention provides, it is also possible to have such
Feature, wherein, exhaust steam apparatus for recovering includes: connect the exhaust steam output channel on exhaust steam pipeline and exhaust steam
Output channel is connected and utilizes low-temperature condensate exhaust steam to be condensed into the water-cooled condenser of condensation water, stores and reclaim
Exhaust steam is introduced directly into by the exhaust steam of desulfurizer by the water collector and being connected with exhaust steam output channel condensing water
Road pipeline, water-cooled condenser comprises the cold water inlet being connected with Steam Turbine and is connected with Steam Turbine
Logical cold water outlet pipe, exhaust steam is condensed in cold water inlet flows into water-cooled condenser by low-temperature condensate,
Low-temperature condensate is back in Steam Turbine through subcooled water outlet pipe after being heated by exhaust steam.
In the superheat steam drying powder process type coal generating system that the present invention provides, it is also possible to have such
Feature: wherein, exhaust steam Water Sproading subsystem also comprises: for carrying the residual gas of water-cooled condenser output
Residual air conveyer device, residual air conveyer device comprises: be connected with the outlet of water-cooled condenser for will residue
Gas delivers into the residual air pipeline in First air mixing chamber and is connected with residual air pipeline and will remain gas
Body be introduced directly into desulfurizer residual air bypass duct.
In the superheat steam drying powder process type coal generating system that the present invention provides, it is also possible to have such
Feature: wherein, vapour powder generates drying device and also comprises: raw coal grinds and is dried formation vapour powder mixture
Coal pulverizer and be connected with the outlet of coal pulverizer for the coarse powder in vapour powder mixture is separated and
Coarse powder is sent back to the mill separator in coal pulverizer.
In the superheat steam drying powder process type coal generating system that the present invention provides, it is also possible to have such
Feature: wherein, vapour powder generates drying device and also comprises: outlet is connected for raw coal with the entrance of coal pulverizer
Carrying out the predrying pipe of pre-dried raw coal and steam pipeline, the import of the predrying pipe of raw coal is defeated by steam
Sending pipe to be communicated on superheat steam pipeline, superheated steam is as the raw coal in predry drying prescription pipe predrying to raw coal
Carry out predrying.
In the superheat steam drying powder process type coal generating system that the present invention provides, it is also possible to have such
Feature: wherein, powder process subsystem also comprises: be connected the gas transmission for carrying gas with exhaust steam circulating line
Manage and be located on appendix the control valve for controlling to open and close appendix, controlled by control valve defeated
Trachea carries gas to exhaust steam circulating line, as desiccant after gas is heated, controls after Preset Time
Valve processed controls appendix and stops carrying gas to exhaust steam circulating line.
In the superheat steam drying powder process type coal generating system that the present invention provides, it is also possible to have such
Feature: wherein, gas be in air or industrial inerting gas any one.
The effect of invention and effect
In the superheat steam drying powder process type coal generating system of the present invention, because powder process subsystem is with mistake
Vapours is desiccant and the ventilation medium of powder process subsystem, and superheated steam is generated drying device by vapour powder
In raw coal in the circulation exhaust steam that formed of moisture evaporation through being formed with the flue gas of burner hearth, superheated steam temperature
Degree and flow meet powder process subsystem drying capacity and the requirement of coal pulverizer ventilation respectively, except at powder process subsystem
In system outside the circulation exhaust steam of circulation work, because of former moisture in coal constantly in powder process subsystem evaporation and produce
Another part exhaust steam is carried out waste heat and Water Sproading by exhaust steam Water Sproading subsystem.
The desiccant that the present invention is powder process subsystem with superheated steam, makes whole powder process subsystem in complete inerting
Run under atmosphere, it is ensured that the safe and reliable operation of the high-volatile coal powder process such as brown coal and quasi-east coal, solve
Long-standing problem brown coal and the pulverized coal preparation system burning of quasi-east coal unit safety reliability service and explosion issues.And
The inside achieving inertia powder process desiccant produces and recycling, is not required to extra in pulverizing process
Steam, nitrogen production system, it is not required that consume other medium such as flue gas, hot blast so that pulverizing process was both
Safe and reliable, flow process is the most efficient again.And with superheated steam for pulverized coal preparation system desiccant, improve in the past
The pulverized coal particle particle size uniformity being burst caused in a large number by coal grain in furnace smoke drying and hot-air drying process is poor
Problem, thus contribute to improving coal powder performance, improve Combustion Efficiency of Coal Powder.
The present invention completely using powder process subsystem internal produce water vapour as desiccant and defeated powder medium so that
Almost waste heat recovery and the Water Sproading of the powder process exhaust steam of either pure steam becomes the easiest.By from steamer
Low-temperature condensate in unit cools down exhaust steam, low-temperature condensate as cooling medium in exhaust steam apparatus for recovering
Return Steam Turbine after being heated to uniform temperature thus reduce the low-pressure heater amount of drawing gas, so that in a large number
The latent heat of condensation of exhaust steam is effectively utilized by Steam Turbine therrmodynamic system, thus significantly improves power plants generating electricity efficiency,
And, with existing by compared with the low-pressure coal saver of flue gas, the body of exhaust steam apparatus for recovering in the present invention
Long-pending and cost of investment all can be greatly reduced.And, exhaust steam apparatus for recovering is realizing waste heat recovery institute simultaneously in fact
The recycling and reuse of existing great lot of water resources, have immeasurable environmental protection meaning to rich coal water-deficient area especially
Justice.
The present invention completely using powder process subsystem internal produce water vapour as desiccant and defeated powder medium so that
The almost Water Sproading of the powder process exhaust steam of either pure steam becomes the easiest.And the recovery of great lot of water resources and again
Utilize, especially rich coal water-deficient area is had immeasurable environment protection significance.
The present invention carries out vapour powder separation by coal collector to vapour powder mixture and obtains low moisture coal dust, makes
Obtain coal quantity to significantly improve.This coal dust after drying and upgrading is sent into pot by uniform temperature air
Stove burns, and will not have the low combustion instability of in-furnace temperature, low NO againXBurning tissues burning difficulty etc. is asked
Topic.Meanwhile, use pulverized coal carried by hot air that inert gas content in First air is greatly decreased, thus breeze airflow
Ignition heat reduces, and in First air, oxygen concentration improves.Coefficient result is both to have improve breeze airflow
Combustion stability and efficiency of combustion, the low NOx combustion tissue also making breeze airflow is convenient, thus real
Existing clean and effective stably burns.And, this coal dust after drying and upgrading is by blowing in powder feeding subsystem
The First air with uniform temperature sends into boiler combustion, and the water from the raw coal that powder process subsystem evaporates
Divide and no longer enter boiler with powder feeding medium so that boiler exhaust gas amount reduces in a large number, correspondingly exhaust gas temperature
Also can reduce, finally make boiler exhaust gas heat loss be greatly reduced, boiler thermal output significantly improves.
Therefore, the superheat steam drying powder process type coal generating system that the present invention can provide has prominent Water Sproading effect
Benefit and energy-saving benefit.
Accompanying drawing explanation
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 controller system 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 air-supply powder feeding subsystem in the embodiment of the present invention；
Fig. 6 is the block diagram of powder process subsystem in the embodiment of the present invention.
Detailed description of the invention
For the technological means making the present invention realize, creation characteristic, reach purpose and be easy to understand with effect,
Following example are in conjunction with the accompanying drawings and embodiments to the present invention relates to superheat steam drying powder process type coal generating system
It is 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 it is shown in figure 1, superheat steam drying powder process type coal generating system 100 includes: boiler controller system 501, vapour
Wheel unit 502 and generating set 503.
Raw coal is thermally formed high-temperature high-pressure steam at the heat that boiler controller system 501 burning produces to water and enters
Enter Steam Turbine 502 to do work, and then drive generating set 503 to generate electricity.
Fig. 2 is the structured flowchart of boiler controller system in the embodiment of the present invention.
As in figure 2 it is shown, boiler controller system 501, including: 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.
Air-supply powder feeding subsystem 403 is to forming First air and secondary wind respectively after environment cold wind 2 process, wherein,
Raw coal 1 is ground after the coal dust of formation mixes by a certain percentage and sends into pot by First air and powder process subsystem 401
In stove host subsystem 402, the secondary wind of air-supply powder feeding subsystem 403 is then directly entered boiler host subsystem
Participating in burning in 402, in powder process subsystem 401, isolated a part of exhaust steam is transported to exhaust steam Water Sproading
System 404 carries out Water Sproading, and exhaust steam is returned after being condensed into condensation water by the low-temperature condensate in Steam Turbine 502
Take in row recycling.Another part exhaust steam is heated as overheated steaming by the high-temperature flue gas of boiler host subsystem 402
Vapour, enters in powder process subsystem 401 as desiccant afterwards.The flue gas of boiler host subsystem 402 is the most laggard
Enter gas cleaning subsystem 405 and be cleaned heel row to air.
Fig. 3 is the structural representation of superheat steam drying powder process type coal generating system in the embodiment of the present invention.
As it is shown on figure 3, Steam Turbine 502 utilizes the heat energy produced in boiler controller system 501 that feedwater heating is obtained height
Temperature high-pressure water vapor thus drive electromotor unit 503.Steam Turbine 502 comprises feed pipe 61, steam conveying
Pipe 62, steam turbine 60.Generating set 503 comprises electromotor 70.Electromotor 70 is connected with steam turbine 60, sends out
Motor 70 generates electricity under the driving of steam turbine 60.
Powder process subsystem 401 includes: vapour powder generates drying device, desiccant generating means, vapour powder segregation apparatus.
Vapour powder generates drying device for grinding and utilize desiccant generating means generation to be dried in raw coal 1
Raw coal 1 is dried thus forms vapour powder mixture by agent, and primary mixture is divided after entering vapour powder segregation apparatus
From obtaining coal dust and exhaust steam, gained coal dust can be stored for or be sent directly in boiler host subsystem 402 burning,
The desiccant mostly as powder process subsystem 401 of gained exhaust steam and ventilation medium are in powder process subsystem 401
Circulation work, another part exhaust steam is recovered profit again after being condensed into condensation water by exhaust steam Water Sproading subsystem 404
With.
Vapour powder generates drying device and comprises: run coal bin 5, feeder 6, coal pulverizer 7, mill separator 8.Vapour
Powder segregation apparatus comprises: powder process pipeline 9, coal collector 10, Pulverized Coal Bin 11.Desiccant generating means comprises:
Exhaust steam pipeline 30, exhaust steam blower fan 31, exhaust steam circulating line 32, exhaust steam heater 33, superheat steam pipeline 34,
Booster fan 35, appendix 52, control valve 51.Exhaust steam heater 33 utilizes from boiler host subsystem 402
In the heat of flue gas circulation exhaust steam (i.e., water vapour) is heated and is obtained the overheated steaming as desiccant
Vapour.
Boiler host subsystem 402 obtains high-temperature high-pressure steam for water is carried out heating, including: boiler
Main frame 24, coal burner 23.Boiler main frame 24 include burner hearth (being not drawn in figure) and with burner hearth smoke
The stove inner flue (being not drawn in figure) that mouth is connected.Burner hearth is used for making coal dust and the abundant combustion heat release of air also
And generation flue gas, the heat of the water wall absorption flue gas of burner hearth circumference is so that flue gas temperature of hearth outlet is closing
Within the scope of Shi, in the flue that furnace outlet is later, it is disposed with soda pop heating surface, air preheater and this reality
Execute the exhaust steam heater 33 of example.Certainly, on the premise of can ensure that heating surface safe operation, exhaust steam is heated
Device 33 can also be arranged in burner hearth.
Air-supply powder feeding subsystem 403 includes: machine supplying powder 12, pressure fan 14, air preheater 15, secondary wind
Hot air duct 16, First air hot air duct 17, first cooling by wind wind pipeline 18, First air mixing chamber 19,
Secondary wind 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 includes: exhaust steam apparatus for recovering and residual air conveyer device.Exhaust steam water returns
Receiving apparatus comprises: exhaust steam output channel 36, water-cooled condenser 37, cold water inlet 65, cold water outlet pipe
66, exhaust steam bypass duct 41, water collector 40.Residual air conveyer device comprises: air ejector 38, residual air pipeline
39 and residual air bypass duct 42.
Gas cleaning subsystem 405 includes: cleaner unit 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 are sequentially connected with,
Mill separator 8 is located at the top of coal pulverizer 7 and is connected with coal pulverizer 7, going out of coal collector 10
Steam 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 11
Even, the outlet of Pulverized Coal Bin 11 is connected with machine supplying powder 12, machine supplying powder 12 and the powder inlet of air and powder mixer 13
Being 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 22
It is connected with coal burner 23.Stove inner flue is connected with the outlet of burner hearth, and air preheater 15 is positioned at stove
The afterbody of inner flue.
Water-cooled condenser 37 has refrigerant inlet and refrigerant exit.Cold water inlet 65 connect refrigerant inlet and
The condensing water conduit of Steam Turbine 502, cold water outlet pipe 66 connects refrigerant exit and Steam Turbine 502, cold
The low-temperature condensate flowed out by Steam Turbine 502 is sent in water-cooled condenser 37 by water water inlet pipe 65, low temperature
Condense after the exhaust steam (i.e., water vapour) in water-cooled condenser 37 is absorbed heat by water through by cold water outlet pipe 66
Flow back in Steam Turbine 502.
Pressure fan 14 be connected with the air side import of air preheater 15 and with the one of first cooling by wind airduct 18
End is connected, and the air side outlet of air preheater 15 is the most accordingly by secondary wind hot air duct 16
It is connected with the air inlet of First air hot air duct 17 with coal burner 23 and First air mixing chamber 19.Once
The other end of air-cooled airduct 18 is connected with the air inlet of First air mixing chamber 19, First air mixing chamber 19 with
First air booster fan 20 is connected, and First air booster fan 20 is mixed with wind powder by First air pipeline 21
Device 13 is connected.
The entrance of exhaust steam pipeline 30 is connected with the gas outlet of coal collector 10.Exhaust steam blower fan 31 is located at
On exhaust steam pipeline 30, for extracting the exhaust steam in coal collector 10.The arrival end of exhaust steam circulating line 32
Outlet with exhaust steam pipeline 30 is connected, and the port of export of exhaust steam circulating line 32 enters with exhaust steam heater 33
QI KOU is connected, and the gas outlet of exhaust steam heater 33 is connected with one end of superheat steam pipeline 34, overheated
The other end of jet chimney 34 is connected with the entrance of booster fan 35, the outlet of booster fan 35 and coal-grinding
Machine 7 is connected.Appendix 52 is connected with exhaust steam circulating line 32, and control valve 51 is located on appendix 52
For controlling opening and closing appendix 52.
The entrance of exhaust steam output channel 36 connects on exhaust steam pipeline 30, the outlet of exhaust steam output channel 36 with
The import of water-cooled condenser 37 is connected, and exhaust steam bypass duct 41 is in parallel with water-cooled condenser 37, water collector 40
It is connected with water-cooled condenser 37, is water cooled the condensation water that condenser 37 reclaims, water-cooled condensing for storing
The residual air outlet of device 37 is connected with the import of air ejector 38, and the outlet of air ejector 38 connects residual air pipe respectively
The one end in road 39 and one end of residual air bypass duct 42, the other end of residual air bypass duct 42 connects desulfurization dress
Putting 28, the other end of residual air pipeline 39 connects First air mixing chamber 19.Through water-cooled condenser 37 recycle-water
Remaining incondensable gas (hereinafter referred to as residual gas) after steam, this residual gas is through residual air pipeline
39 enter First air mixing chamber 19 enters in burner hearth as First air so that may contain in residual gas can
Combustion gas body is abundant after-flame in burner hearth, it addition, residual gas can also enter de-through residual air bypass duct 42
In sulfur device 28.This residual gas is other incoagulable gas of mixing in water vapour, such as, leak into weary
The fuel gas that the air of soda pop retracting device and raw coal 1 volatilize in pulverizing process.
Between the outlet of stove inner flue, cleaner unit 25, air-introduced machine 27, desulfurizer 28 and chimney 29 sequentially
It is connected by smoke discharging pipe 26.
One end of the feed pipe 61 of Steam Turbine 502 is connected with the feedwater outlet of Steam Turbine 502, another
End is connected with boiler host subsystem 402, one end of steam pipeline 62 and boiler host subsystem 402
Being connected, the other end is connected with the steam inlet of Steam Turbine 502.
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 is delivered into coal pulverizer 7 by run coal bin 5 through feeder 6, former
Coal 1 is milled into coal dust in coal pulverizer 7, is entered after the desiccant dryness of coal pulverizer 7 from coal-grinding simultaneously
Exporting in machine 7, exhaust steam and the mixture of coal dust that coal pulverizer 7 exports are, vapour powder mixture divides through coarse powder
When device 8, coarse powder is separated and reenters in coal pulverizer 7 and again grinds.Separate through coarse powder
The vapour powder mixture of device 8 enters coal collector 10 by powder process pipeline 9, and vapour powder is mixed by coal collector 10
Exhaust steam and coal dust in compound are isolated, and coal dust is stored by Pulverized Coal Bin 11, the coal dust in Pulverized Coal Bin 11
Air and powder mixer 13 is sent into, in air and powder mixer 13 and from First air mixing chamber 19 by machine supplying powder 12
First air mixes, and is then sent to coal burner 23 by powder feeding pipes 22 and enters in burner hearth together with secondary wind
Burn and heat feedwater.
Fig. 5 is the block diagram of air-supply powder feeding subsystem in the embodiment of the present invention.
The flow process (step S4) of air: as shown in Fig. 3, Fig. 4 and Fig. 5, environment cold wind 2 is, air
Sent into by pressure fan 14 and be thermally formed hot blast in air preheater 15 by flue gas further.Air preheater 15
The hot blast of air side outlet directly draws toward coal burner through secondary wind hot air duct 16 mostly as secondary wind
23.The environment cold wind 2 that another small part hot blast and first cooling by wind airduct 18 carry is at First air mixing chamber 19
Inside carrying out being mixed to form First air, the warm air of first cooling by wind airduct 18 conveying can regulate the temperature of First air,
First air enters air and powder mixer 13 through First air pipeline 21 after by First air booster fan 20 supercharging,
And then coal dust sent in burner hearth burn.
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 from
Stove inner flue is discharged, and adds to air preheater 15 and to exhaust steam heater 33 at stove inner flue afterbody
Heat, the flue gas removing dust device 25 of discharge enters air-introduced machine 27 by smoke discharging pipe 26 after purifying, enters afterwards
In desulfurizer 28, through the flue gas 3 of desulfurizing and purifying by chimney 29 row 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): by the water vapour in powder process subsystem 401 by raw coal 1
Moisture evaporation composition.Export at coal pulverizer 7 and be referred to as exhaust steam between the air inlet of exhaust steam heater 33, weary
Superheated steam it is referred to as between vapour heater 33 gas outlet and coal pulverizer 7 entrance.Exhaust steam and coal dust are at coal powder collection
Separating in device 10, isolated exhaust steam is extracted and is divided into out two parts by exhaust steam blower fan 31, a part of weary
Vapour is sent into exhaust steam heater 33 by exhaust steam circulating line 32 and is carried out being thermally formed superheated steam, this superheated steam
Send into coal pulverizer 7 as desiccant through superheat steam pipeline 34, the raw coal 1 entering coal pulverizer 7 is carried out
Being dried, the vapour powder mixture of coal pulverizer 7 outlet is isolated coal dust by coal collector 10 and exhaust steam forms, this
Time the moisture that evaporated by superheated steam and the raw coal 1 as desiccant of exhaust steam form, from coal collector
10 ventholes discharge exhaust steam be partly into exhaust steam heater 33 and as desiccant at powder process subsystem
Circulation in 401, another part exhaust steam is sent into water-cooled condenser 37 through exhaust steam output channel 36 and is reclaimed.
Exhaust steam is condensed by the condensation at low temperature water cooling of Steam Turbine 502 in water-cooled condenser 37, thus obtains a large amount of
Condense water, condense water and combine in water collector 40.
The flow process (S5) of feedwater: water forms high temperature after feed pipe 61 is heated by boiler host subsystem 402
High-pressure water vapor, high-temperature high-pressure steam does work in steam pipeline 62 sends into Steam Turbine 502,
Steam Turbine 502 drives electromotor 70 to work.
The residual gas discharged after water vapour reclaims in exhaust steam apparatus for recovering is the most defeated through residual air conveyer device
Deliver in First air mixing chamber 19 or in desulfurizer 28.When this residual gas contains fuel gas,
Close the valve on residual air bypass duct 42, make this residual gas all enter in burner hearth through residual air pipeline 39
Burn；When this residual gas is without fuel gas, close the valve on residual air pipeline 39, make this remain
Residual air body is discharged after gas cleaning subsystem 405.
In the present embodiment, first, steam appendix 52 is controlled to exhaust steam circulating line by control valve 51
32 conveying gases 50, as desiccant to the raw coal 1 in entrance coal pulverizer 7 and coal after gas 50 is heated
Powder is dried, and then, after Preset Time, control valve 51 controls steam appendix 52 and stops to exhaust steam
Circulating line 32 carries gas 50, and the valve simultaneously opened on exhaust steam circulating line 32 sets up exhaust steam recirculation.
After running a period of time, steam appendix 52 gas 50 inputted progressively is discharged by exhaust steam output channel 36,
Making desiccant convergence is that either pure steam does not contains other miscellaneous QI, and so achieving either pure steam is desiccant pair
Coal 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 overheated
Steam is powder process subsystem desiccant and coal pulverizer ventilation medium, and superheated steam is exported because of water in coal by coal pulverizer
The circulation exhaust steam dividing evaporation to be formed is thermally formed through exhaust steam heater, and superheat steam temperature meets respectively with flow
Powder process subsystem drying capacity and the requirement of coal pulverizer ventilation, except circulating following of work in powder process subsystem
Outside ring exhaust steam, because of moisture in coal constantly in powder process subsystem evaporation and produce another part output exhaust steam,
Reclaimed by exhaust steam Water Sproading subsystem carries out condensation with the low-temperature condensate in Steam Turbine for cooling medium,
Heat in exhaust steam is recycled in Steam Turbine therrmodynamic system simultaneously.
In datonation-inhibition inert gas flue gas, nitrogen and water vapour that industry is conventional, water vapour has optimal pressing down
Quick-fried performance.The desiccant that the present embodiment is powder process subsystem with superheated steam, makes whole powder process subsystem complete
Run under full inerting atmosphere, it is ensured that the safe and reliable operation of the high-volatile coal powder process such as brown coal and quasi-east coal,
Solve long-standing problem brown coal and the pulverized coal preparation system burning of quasi-east coal unit safety reliability service and explosion issues.
And the inside achieving inertia powder process desiccant produces and recycling, is not required to volume in pulverizing process
Outer steam, nitrogen production system, it is not required that consume other medium such as flue gas, hot blast so that powder process
Journey is the most safe and reliable, and flow process is the most efficient again.And with superheated steam for pulverized coal preparation system desiccant, improve
The pulverized coal particle particle size uniformity being burst caused in a large number by coal grain in conventional furnace smoke drying and hot-air drying process
Poor, thus contribute to improving coal powder performance, improve Combustion Efficiency of Coal Powder.
The water vapour that the present embodiment produces with powder process subsystem internal completely is as desiccant with defeated powder medium so that
Almost waste heat and the Water Sproading of the powder process exhaust steam of either pure steam becomes the easiest.By from Steam Turbine
In low-temperature condensate in exhaust steam apparatus for recovering as cooling medium cool down exhaust steam, low-temperature condensate is added
Heat reduces the low-pressure heater amount of drawing gas to returning Steam Turbine after uniform temperature, so that a large amount of exhaust steam
The latent heat of condensation effectively utilized by Steam Turbine therrmodynamic system, thus significantly improve power plants generating electricity efficiency, and,
With existing by compared with the low-pressure coal saver of flue gas, the volume of exhaust steam apparatus for recovering and throwing in the present invention
Money cost all can be greatly reduced.And, it is big that exhaust steam apparatus for recovering is realized realizing waste heat recovery while
The recycling and reuse of amount water resource, have immeasurable environment protection significance to rich coal water-deficient area especially.
The present embodiment carries out vapour powder separation 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 air
Boiler burns, and will not have the low combustion instability of in-furnace temperature, low NO againXBurning tissues burning difficulty etc.
Problem.Meanwhile, use pulverized coal carried by hot air that inert gas content in First air is greatly decreased, thus coal dust gas
Stream ignition heat reduces, and in First air, oxygen concentration improves.Coefficient result is both to have improve coal dust gas
The combustion stability of stream and efficiency of combustion, the low NOx combustion tissue also making breeze airflow is convenient, thus
Realize clean and effective stably to burn.And, this coal dust after drying and upgrading is by powder feeding subsystem of blowing
In there is the First air of uniform temperature send into boiler combustion, and from the raw coal that powder process subsystem evaporates
Moisture no longer enters boiler with powder feeding medium so that boiler exhaust gas amount reduces in a large number, correspondingly boiler exhaust gas temperature
Degree also can reduce, and finally makes boiler exhaust gas heat loss be greatly reduced, and boiler thermal output significantly improves.
In the present embodiment, because residual air conveyer device sends the fuel gas that may contain in water vapour back to pot
Stove burns, thus has fully ensured that raw coal efficiency of combustion in steam generator system.
To sum up, embodiment can provide a kind of green high-efficient coal-burning boiler unit, solves high-moisture fire coal pot
The problem of stove combustion instability, overcomes the tradition inefficient shortcoming of high-moisture coal-fired boiler hot, is significantly carrying
Make powder process subsystem run under inerting atmosphere while high boiler thermal output thus improve high volatile coal
The safety in operation of powder process subsystem, the most prominent, make water in coal using superheated steam as desiccant
Point recovery easily Project Realization, simultaneously improve combustion further also by pick up the heat more than steam condensation
Coal power generation system effectiveness, thus superheat steam drying powder process type coal generating system of the present invention has highly significant
Energy-saving benefit and environment protection significance.
Superheat steam drying powder process type coal generating system the most involved in the present invention is not merely defined in
Structure in above-described embodiment.Above content is only the basic explanation under present inventive concept, and according to the present invention
Any equivalent transformation of being made of technical scheme, protection scope of the present invention all should be belonged to.
Above-mentioned embodiment is the preferred case of the present invention, is not intended to limit protection scope of the present invention.
The gas of appendix conveying can be air, it is also possible to directly carries water vapour, nitrogen, flue gas etc. lazy
In activating QI body any one.
When raw coal moisture is higher, the predrying pipe of raw coal can also be set between coal pulverizer and feeder, former
The import of the predrying pipe of coal is communicated on superheat steam pipeline by steam pipeline, and steam pipeline is by part
Superheated steam is transported in the predrying pipe of raw coal directly contact with raw coal, thus carries out predrying to raw coal, logical
Cross superheated steam to achieve raw coal is dried safely.
Predry drying prescription in the predrying pipe of raw coal is possible not only to the overheated steaming of part being to be carried by steam pipeline
Vapour, it is also possible to being that the entrance point of superheat steam pipeline directly pipe predrying with raw coal is connected, superheated steam passes through
The predrying pipe of raw coal carries out the predrying rear coal pulverizer that enters and vapour powder mixture is further dried raw coal.
Claims (8)
1. a superheat steam drying powder process type coal generating system, for burning to drive electromotor to raw coal
Generating, it is characterised in that including:
Boiler controller system, produces heat energy for described raw coal carries out burning, and utilizes described heat energy feedwater to be added
Heat obtains high-temperature high-pressure steam, comprises: powder process subsystem, boiler host subsystem, air-supply powder feeding subsystem
System and exhaust steam Water Sproading subsystem；And
Steam Turbine, utilizes the acting of described high-temperature high-pressure steam thus drives described electrical power generators, comprise
For carry described feedwater feed pipe, for carry described high-temperature high-pressure steam steam pipeline and
Steam turbine,
Wherein, described powder process subsystem comprises: for grinding described raw coal and by desiccant pair
Described raw coal is dried thus forms the vapour powder generation drying device of vapour powder mixture, mixes described vapour powder
Thing carries out the vapour powder segregation apparatus of isolated coal dust and exhaust steam and generates the desiccant generation of described desiccant
Device,
Described boiler host subsystem, for described feedwater is heated as described high-temperature high-pressure steam, comprises:
Stove inner flue that burner hearth is connected with described furnace outlet, it is positioned at the coal dust firing of described burner hearth entry position
Device,
Described air-supply powder feeding subsystem comprises: be connected with described vapour powder segregation apparatus for pulverized coal conveying to
The First air that the air and powder mixer that powder machine is connected with described machine supplying powder is connected with described air and powder mixer
Mixing chamber, it is positioned at the air preheater of described stove inner flue afterbody and for providing the pressure fan of environment cold wind,
Described exhaust steam Water Sproading subsystem comprises: is connected with described Steam Turbine and utilizes described steam turbine
The low-temperature condensate of group carries out the exhaust steam apparatus for recovering that condensation is reclaimed to a part for described exhaust steam,
Described vapour powder segregation apparatus comprises: described vapour powder mixture carries out coal dust described in isolated and described
The coal collector of exhaust steam,
Described desiccant generating means comprises: be connected for carrying described exhaust steam with described coal collector
Exhaust steam pipeline, connection are used for carrying the exhaust steam circulation pipe of another part of described exhaust steam on described exhaust steam pipeline
Road be connected with described exhaust steam circulating line the described exhaust steam in described exhaust steam circulating line is heated from
And form the exhaust steam heater of the superheated steam as desiccant and described desiccant is delivered to described vapour powder
Generate the superheat steam pipeline being circulated in drying device,
Described exhaust steam heater utilizes the flue gas of described burner hearth to heat the exhaust steam in described exhaust steam heater
Form described superheated steam,
Described machine supplying powder is used for carrying described coal dust extremely described air and powder mixer,
First air and described coal dust from described air-supply powder feeding subsystem is mixed by described air and powder mixer
Obtain wind powder mixture,
Exhaust steam in described exhaust steam apparatus for recovering is condensed by the described low-temperature condensate of described Steam Turbine to be become
Condense water,
Described air preheater carries out heating to a part for described environment cold wind and obtains hot blast, described hot blast
Another part of a part of and described environment cold wind after described First air mixing chamber mixes as described First air
Entering in described air and powder mixer, another part of described hot blast is directly entered the combustion of described coal dust as secondary wind
In burner,
Described coal dust in described wind powder mixture is burnt by described coal burner,
Described coal dust and described First air, described secondary wind are burnt in described burner hearth and are generated described flue gas.
Superheat steam drying powder process type coal generating system the most according to claim 1, it is characterised in that also
Including:
Gas cleaning subsystem, exports with the afterbody of described stove inner flue and is connected, comprise: be sequentially connected with
Cleaner unit, air-introduced machine, desulfurizer, chimney.
Superheat steam drying powder process type coal generating system the most according to claim 2, it is characterised in that:
Wherein, described exhaust steam apparatus for recovering includes: connection exhaust steam output channel on described exhaust steam pipeline,
It is connected with described exhaust steam output channel and utilizes described low-temperature condensate that described exhaust steam is condensed into the water condensing water
Cold condenser, storage are reclaimed the water collector of described condensation water and are connected institute with described exhaust steam output channel
State exhaust steam and be introduced directly into the exhaust steam bypass duct of described desulfurizer,
Described water-cooled condenser comprise the cold water inlet being connected with described Steam Turbine and with described steamer
The cold water outlet pipe that unit is connected,
Described exhaust steam is carried out in described cold water inlet flows into described water-cooled condenser by described low-temperature condensate
Condensation, described low-temperature condensate flows back into described steamer through described cold water outlet pipe after being heated by described exhaust steam
In unit.
Superheat steam drying powder process type coal generating system the most according to claim 3, it is characterised in that:
Wherein, described exhaust steam Water Sproading subsystem also comprises: for carrying the surplus of described water-cooled condenser output
The residual air conveyer device of residual air body,
Described residual air conveyer device comprises: the outlet with described water-cooled condenser is connected for by described residue
Gas deliver into the residual air pipeline in described First air mixing chamber and be connected with described residual air pipeline and
Described residual gas is introduced directly into described desulfurizer residual air bypass duct.
Superheat steam drying powder process type coal generating system the most according to claim 1, it is characterised in that:
Wherein, described vapour powder generation drying device also comprises: described raw coal is ground and is dried formation described
The coal pulverizer of vapour powder mixture and being connected with the outlet of described coal pulverizer in described vapour powder mixture
Coarse powder carry out separating and sending described coarse powder back to mill separator in described coal pulverizer.
Superheat steam drying powder process type coal generating system the most according to claim 5, it is characterised in that:
Wherein, described vapour powder generates drying device and also comprises: outlet be connected with the entrance of described coal pulverizer for
Described raw coal is carried out 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 pipeline
On,
Described superheated steam carries out predry as the described raw coal in predry drying prescription pipe predrying to described raw coal
Dry.
Superheat steam drying powder process type coal generating system the most as claimed in any of claims 1 to 6,
It is characterized in that:
Wherein, described powder process subsystem also comprises: be connected for carrying gas with described exhaust steam circulating line
Appendix and be located on described appendix the control valve for controlling to open and close described appendix,
Control described appendix by described control valve and carry described gas to described exhaust steam circulating line, described
As described desiccant after gas is heated, after Preset Time, the described appendix of described control valve control stops
Only carry described gas to described exhaust steam circulating line.
Superheat steam drying powder process type coal generating system the most according to claim 7, it is characterised in that:
Wherein, during described gas is air or industrial inerting gas any one.
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| JPH0560304A (en) * | 1991-08-28 | 1993-03-09 | Mitsubishi Heavy Ind Ltd | Petroleum/coke burning boiler |
| JP5509024B2 (en) * | 2010-10-12 | 2014-06-04 | 月島機械株式会社 | Coal drying apparatus and coal drying method |
| CN201885213U (en) * | 2010-12-10 | 2011-06-29 | 华北电力大学（保定） | Primary air waste heat utilizing device of direct-blowing powder producing system of coal powder boiler |
| CN102798133B (en) * | 2011-05-27 | 2015-06-17 | 中国电力工程顾问集团东北电力设计院 | Fan grinding hot blast powder feeding and pulverizing system utilizing flue gas drying and water recycling |
| CN203147790U (en) * | 2013-03-18 | 2013-08-21 | 施大钟 | Exhaust air fluidized brown coal medium speed mill straight-blowing coal pulverizing system |
| CN103398369A (en) * | 2013-08-05 | 2013-11-20 | 吕克庆 | Method and system for comprehensive utilization of tail heat of boiler |
| CN104132363A (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 |
| CN204240385U (en) * | 2014-11-13 | 2015-04-01 | 上海理工大学 | Superheat steam drying powder process type coal generating system |
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