CN104329667B - 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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- CN104329667B CN104329667B CN201410639897.2A CN201410639897A CN104329667B CN 104329667 B CN104329667 B CN 104329667B CN 201410639897 A CN201410639897 A CN 201410639897A CN 104329667 B CN104329667 B CN 104329667B
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- 239000003245 coal Substances 0.000 title claims abstract description 243
- 239000000843 powder Substances 0.000 title claims abstract description 211
- 238000000034 method Methods 0.000 title claims abstract description 102
- 230000008569 process Effects 0.000 title claims abstract description 102
- 238000001035 drying Methods 0.000 title claims abstract description 69
- 239000007789 gas Substances 0.000 claims abstract description 90
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 83
- 239000002274 desiccant Substances 0.000 claims abstract description 45
- 239000002817 coal dust Substances 0.000 claims abstract description 39
- 239000000203 mixture Substances 0.000 claims abstract description 27
- 239000003546 flue gas Substances 0.000 claims abstract description 24
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 23
- 238000002156 mixing Methods 0.000 claims abstract description 17
- 238000010438 heat treatment Methods 0.000 claims abstract description 16
- 238000005204 segregation Methods 0.000 claims abstract description 10
- 238000009833 condensation Methods 0.000 claims description 18
- 230000005494 condensation Effects 0.000 claims description 18
- 230000008676 import Effects 0.000 claims description 8
- 238000000605 extraction Methods 0.000 claims description 7
- 238000004140 cleaning Methods 0.000 claims description 6
- 230000015572 biosynthetic process Effects 0.000 claims description 5
- 238000000227 grinding Methods 0.000 claims description 5
- 230000002209 hydrophobic effect Effects 0.000 claims description 3
- 239000003077 lignite Substances 0.000 description 30
- 238000002485 combustion reaction Methods 0.000 description 22
- 238000002360 preparation method Methods 0.000 description 12
- 239000000779 smoke Substances 0.000 description 10
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 8
- 238000001816 cooling Methods 0.000 description 8
- 238000010248 power generation Methods 0.000 description 8
- 230000008901 benefit Effects 0.000 description 7
- 230000000694 effects Effects 0.000 description 7
- 238000010298 pulverizing process Methods 0.000 description 7
- 230000005611 electricity Effects 0.000 description 5
- 238000011084 recovery Methods 0.000 description 5
- 238000009423 ventilation Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 239000002737 fuel gas Substances 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 238000007664 blowing Methods 0.000 description 3
- 238000007599 discharging Methods 0.000 description 3
- 238000001704 evaporation Methods 0.000 description 3
- 230000008020 evaporation Effects 0.000 description 3
- 238000004880 explosion Methods 0.000 description 3
- 239000011261 inert gas Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 239000002802 bituminous coal Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 235000019504 cigarettes Nutrition 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 239000002826 coolant Substances 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 230000002950 deficient Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 238000007602 hot air drying Methods 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 239000003507 refrigerant Substances 0.000 description 2
- 230000001172 regenerating effect Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 230000002269 spontaneous effect Effects 0.000 description 2
- 238000010025 steaming Methods 0.000 description 2
- 239000002918 waste heat Substances 0.000 description 2
- 208000032843 Hemorrhage Diseases 0.000 description 1
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 1
- 229920002522 Wood fibre Polymers 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 description 1
- 239000003830 anthracite Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 208000034158 bleeding Diseases 0.000 description 1
- 231100000319 bleeding Toxicity 0.000 description 1
- 230000000740 bleeding effect Effects 0.000 description 1
- 239000003610 charcoal Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 239000003500 flue dust Substances 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 230000002459 sustained effect Effects 0.000 description 1
- 210000003437 trachea Anatomy 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D1/00—Burners for combustion of pulverulent fuel
-
- 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
- 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
- F01K17/00—Using steam or condensate extracted or exhausted from steam engine plant
- F01K17/02—Using steam or condensate extracted or exhausted from steam engine plant for heating purposes, e.g. industrial, domestic
-
- 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
- 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
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D2201/00—Burners adapted for particulate solid or pulverulent fuels
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Food Science & Technology (AREA)
- Drying Of Solid Materials (AREA)
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, the exhaust steam heater of desiccant generating means utilize from steam turbine draw gas the exhaust steam exhaust steam heater is thermally formed superheated steam, air preheater carries out heating to a part for environment cold wind and obtains hot blast, a part for hot blast enters in air and powder mixer as First air with another part of environment cold wind after First air mixing chamber mixes, another part of hot blast is sent directly in coal burner as secondary wind, coal dust in wind powder mixture is burnt by coal burner, coal dust and First air, secondary wind is burnt in burner hearth and is generated flue gas.
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 turbine
System.
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.
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 the most feasible that this makes to reclaim moisture from smoke evacuation, does not has so far by cooling electricity
Stand boiler exhaust gas thus realize the engineer applied of flue gas Water Sproading.
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, and the superheat steam drying powder process type coal generating system of generating efficiency can also be improved.
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, for feedwater is heated as high-temperature high-pressure steam, wraps
Contain: 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:
For a part for exhaust steam carries out the exhaust steam apparatus for recovering of Water Sproading, vapour powder segregation apparatus comprises: to vapour
Powder mixture carries out the coal collector of isolated coal dust and exhaust steam, and desiccant generating means comprises: with coal
Powder catcher is connected for the exhaust steam pipeline carrying exhaust steam, connects on exhaust steam pipeline for carrying exhaust steam
The exhaust steam circulating line of another part is connected with exhaust steam circulating line and carries out exhaust steam in exhaust steam circulating line
Heat thus form the exhaust steam heater of the superheated steam as desiccant and desiccant is delivered to the life of vapour powder
Become in drying device the superheat steam pipeline being circulated, exhaust steam heater utilize from steam turbine draw gas
Condensation heat is thermally formed superheated steam to the exhaust steam in exhaust steam heater, and machine supplying powder is used for pulverized coal conveying
To air and powder mixer, First air and the coal dust from air-supply powder feeding subsystem is mixed by air and powder mixer
To wind powder mixture, air preheater carries out heating to a part for environment cold wind and obtains hot blast, the one of hot blast
Part enters air and powder mixer as First air with another part of environment cold wind after First air mixing chamber mixes
In, another part of hot blast is directly entered in coal burner as secondary wind, and wind powder is mixed by coal burner
Coal dust in compound burns, and coal dust and First air, secondary wind are burnt in burner hearth and generated 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: connection exhaust steam output channel on exhaust steam pipeline is with weary
Vapour output channel is connected for exhaust steam being condensed into the condenser condensing water and storing the collection of recovery condensation water
Hydrophone and be connected with exhaust steam output channel and exhaust steam is introduced directly into the exhaust steam bypass duct of desulfurizer.
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 remaining of the residual gas of condenser output
Gas conveyer device, residual air conveyer device comprises: be connected with the outlet of condenser for being carried by residual gas
Enter the residual air pipeline in First air mixing chamber and be connected with residual air pipeline and residual gas is directly drawn
Enter 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: is connected with coal collector and to store coal dust
Pulverized Coal Bin.
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 heater comprises: be connected with Steam Turbine for conveying draw gas extraction line,
The drain water piping of the hydrophobic return Steam Turbine formed after exhaust steam heater condensation heat of drawing gas for conveying.
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, steam pipeline, the import of the predrying pipe of raw coal is carried by steam
Pipe is communicated on superheat steam pipeline, and superheated steam enters as the raw coal in predry drying prescription pipe predrying to raw coal
Row is 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 heating shape with the condensation heat of extracted steam from turbine
Becoming, superheat steam temperature and flow meet powder process subsystem drying capacity and the requirement of coal pulverizer ventilation respectively,
Except in addition to circulating the circulation exhaust steam of work in powder process subsystem, because former moisture in coal constantly steams at powder process subsystem
Another part exhaust steam sent out and produce is carried out 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.
Further, the superheated steam in the present invention is to utilize extracted steam from turbine heating exhaust steam to obtain, i.e. exhaust steam heating
Thermal source in device comes from the condensation heat that Steam Turbine is drawn gas so that the condensation heat drawn gas effectively is used in
The drying capacity of coal pulverizing system, namely the condensation used heat of steam in Steam Turbine is had by steam generator system
Effect utilizes, and the energy loss of Steam Turbine thermodynamic cycle is greatly reduced.Thus, apply this technical scheme also
Power plant efficiency can be made to be greatly improved, there is prominent energy-saving benefit.
The water vapour that the present invention produces with powder process subsystem internal completely is as desiccant with defeated powder medium so that several
Water Sproading for the powder process exhaust steam of either pure steam becomes the easiest.By the waste heat recovery of powder process exhaust steam,
Can further improve boiler and the efficiency of energy utilization of coal-fired energy consumption system；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 and returns
Benefit of producing effects and energy-saving benefit, and generating efficiency can also be improved.
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；And
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 the water vapour of High Temperature High Pressure at the heat that boiler controller system 501 burning produces to water
Enter Steam Turbine 502 to 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 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 recovered after being condensed into condensation water and recycles.Another part exhaust steam
Become superheated steam by the heat in the drawing gas of Steam Turbine 502, enter system as desiccant afterwards
In powder subsystem 401.The flue gas of boiler host subsystem 402 enters gas cleaning subsystem 405 and is 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 and heat regenerative system of drawing gas (being not drawn in figure).Generating set 503 comprises electromotor 70.
Electromotor 70 is connected with steam turbine 60, and electromotor 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, extraction line 63, dredge
Waterpipe 64, superheat steam pipeline 34, booster fan 35, appendix 52, control valve 51.Exhaust steam heater
Thermal source in 33 comes from the condensation heat drawn gas in Steam Turbine 502, utilizes drawing gas of Steam Turbine 502
Heating exhaust steam obtains the superheated steam as desiccant.Wherein, draw gas and can directly extract the middle temperature of steam turbine 60
The one-level that the desiccant temperature needed for reaching powder process subsystem is heated in exhaust steam is enough drawn gas, it addition, draw gas by degree
The more bleedings that can also extract different temperatures stress level progressively heats exhaust steam until powder process subsystem
Required desiccant temperature.
Boiler host subsystem 402 obtains high-temperature high-pressure steam for feedwater is carried out heating, including: pot
Stove main frame 24, coal burner 23.Boiler main frame 24 includes burner hearth (being not drawn in figure) and goes out with burner hearth
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
And producing flue gas, the heat of the water wall absorption flue gas of burner hearth circumference is so that flue gas temperature of hearth outlet exists
Within the scope of He Shi, in the flue that furnace outlet is later, it is disposed with soda pop heating surface, air preheater.
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, condenser 37, exhaust steam bypass duct 41, water collector 40.Remaining
Gas 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.
Pressure fan 14 export the air side import with air preheater 15 be connected and with first cooling by wind airduct 18
One end be connected, the outlet of the air side of air preheater 15 is respectively by secondary wind hot air duct 16 and
Secondary wind heat wind pipeline 17 is connected with the air inlet of coal burner 23 and First air mixing chamber 19.First cooling by wind
The other end of airduct 18 is connected with the air inlet of First air mixing chamber 19, First air mixing chamber 19 with once
Wind booster fan 20 is connected, and First air booster fan 20 is by First air pipeline 21 and air and powder mixer 13
It 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 condenser 37 is connected, and condenser 37 has refrigerant inlet 70 and refrigerant exit 71, exhaust steam shunt valve
Road 41 is in parallel with condenser 37, and water collector 40 is connected with condenser 37, for storing by condenser 37
The condensation water reclaimed, the residual air outlet of condenser 37 is connected with the import of air ejector 38, air ejector 38
Outlet connects one end and one end of residual air bypass duct 42, the residual air bypass duct 42 of residual air pipeline 39 respectively
The other end connect desulfurizer 28, the other end of residual air pipeline 39 connects First air mixing chamber 19.Pass through
Remaining incondensable gas (hereinafter referred to as residual gas) after condenser 37 recycle-water steam, this residue gas
Body enters First air mixing chamber 19 through residual air pipeline 39 and enters in burner hearth as First air so that residue gas
The fuel gas that may contain in body is abundant after-flame in burner hearth, it addition, residual gas can also be through residual air
Bypass duct 42 enters in desulfurizer 28.This residual gas be in water vapour mixing other is incoagulable
Gas, such as, leak into the air of exhaust steam apparatus for recovering and that raw coal 1 volatilizes in pulverizing process is flammable
Gas.
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, and Steam Turbine 502 passes through extraction steam pipe
Road 63 is connected with the import of exhaust steam heater 33, and Steam Turbine 502 passes through drain water piping 64 with weary
The outlet of vapour heater 33 is connected, and enters exhaust steam from drawing gas of steam turbine 60 extraction by extraction line 63
In heater 33 heating exhaust steam, drawing gas afterwards, formation is hydrophobic flows back into steamer by drain water piping 64
Unit 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 (S4) of air: as shown in Fig. 3, Fig. 4, Fig. 5, environment cold wind 2 is i.e., air is by blowing
It is interior by flue gas that air preheater 15 sent into by machine 14.The big portion of hot blast of air preheater 15 air side outlet
It is allocated as directly drawing toward coal burner 23 through secondary wind hot air duct 16 for secondary wind.Another small part hot blast with
The environment cold wind 2 of first cooling by wind wind pipeline 18 conveying carries out being mixed to form once in First air mixing chamber 19
Wind, the environment cold wind 2 of first cooling by wind wind pipeline 18 conveying can regulate the temperature of First air, and First air is through quilt
Enter air and powder mixer 13 through First air pipeline 21 after First air booster fan supercharging, and then coal dust is sent into
Burner hearth burns.
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 heats air preheater 15 at stove inner flue afterbody, the flue gas removing dust of discharge
Device 25 enters air-introduced machine 27 by smoke discharging pipe 26 after purifying, and enters afterwards in desulfurizer 28, through de-
Sulfur purify flue gas 3 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 (S6-1, S6-2): by the water vapour in powder process subsystem 401 by
The moisture evaporation composition of raw coal 1.Export between the air inlet of exhaust steam heater 33 the most weary at coal pulverizer 7
Vapour, is referred to as superheated steam between exhaust steam heater 33 gas outlet and coal pulverizer 7 entrance.Exhaust steam and coal dust exist
Separating in coal collector 10, isolated exhaust steam is extracted out by exhaust steam blower fan 31 and is divided into two parts,
A part of exhaust steam is sent into exhaust steam heater 33 by exhaust steam circulating line 32 and is carried out being thermally formed superheated steam, should
Superheated steam sends into coal pulverizer 7 as desiccant through superheat steam pipeline 34, to entering the former of coal pulverizer 7
Coal 1 is dried, and the vapour powder mixture of coal pulverizer 7 outlet is isolated coal dust and exhaust steam by coal collector 10
Composition, the moisture that exhaust steam now is evaporated by superheated steam and the raw coal 1 as desiccant forms, from coal
Being partly into exhaust steam heater 33 and exist as desiccant of exhaust steam that powder catcher 10 venthole is discharged
Circulation in powder process subsystem 401, another part exhaust steam is sent into condenser 37 through exhaust steam output channel 36 and is entered
Row reclaims.Exhaust steam is cooled by coolant 80 in condenser 37, thus obtains and condense water in a large number, condenses
Water combines 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.Heat regenerative system extraction section of drawing gas in Steam Turbine 502 is taken out
Vapour, this draws gas and heats the exhaust steam in exhaust steam heater 33, produces the superheated steam as desiccant.
The residual gas that exhaust steam apparatus for recovering is discharged after reclaiming water vapour 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 does not contains fuel gas, open the valve on residual air bypass duct 42,
This residual gas is made to discharge 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
Divide the circulation exhaust steam that evaporation is formed through the exhaust steam heater heating shape for adding thermal medium of drawing gas in Steam Turbine
Becoming, superheat steam temperature and flow meet powder process subsystem drying capacity and the requirement of coal pulverizer ventilation respectively,
Except, in addition to circulating the circulation exhaust steam of work in powder process subsystem, constantly steaming in powder process subsystem because of moisture in coal
Another part output exhaust steam sent out and produce is carried out Water Sproading by exhaust steam Water Sproading subsystem.
Further, the superheated steam in the present embodiment is to utilize extracted steam from turbine heating exhaust steam to obtain, i.e. exhaust steam adds
Thermal source in hot device comes from the condensation heat that Steam Turbine is drawn gas so that the condensation heat drawn gas effectively utilizes
In the drying capacity of coal pulverizing system, namely make the condensation used heat of steam in Steam Turbine by steam generator system
Effectively utilize, the energy loss of Steam Turbine thermodynamic cycle is greatly reduced.
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.More than powder process exhaust steam
Recuperation of heat, can further improve boiler and the efficiency of energy utilization of coal-fired energy consumption system；And great lot of water resources
Recycle, especially rich coal water-deficient area is had immeasurable environment protection significance.
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 (9)
1. a superheat steam drying powder process type coal generating system, for burning to drive electrical power generators to raw coal, it is characterised in that including:
Boiler controller system, produces heat energy for described raw coal carries out burning, and utilizes described heat energy that feedwater heating is obtained high-temperature high-pressure steam, comprise: powder process subsystem, boiler host subsystem, air-supply powder feeding subsystem and exhaust steam Water Sproading subsystem；And
Steam Turbine, utilizes the acting of described high-temperature high-pressure steam thus drives described electrical power generators, comprise the feed pipe for carrying described feedwater, for carrying steam pipeline and the steam turbine of described high-temperature high-pressure steam,
Wherein, described powder process subsystem comprises: forms the vapour powder generation drying device of vapour powder mixture for grinding described raw coal and being dried described raw coal by desiccant, described vapour powder mixture carries out the vapour powder segregation apparatus of isolated coal dust and exhaust steam and generates the desiccant generating means of described desiccant
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, be positioned at the coal burner of described burner hearth entry position,
Described air-supply powder feeding subsystem comprises: the First air mixing chamber that the air and powder mixer that the machine supplying powder for pulverized coal conveying that is connected with described vapour powder segregation apparatus is connected with described machine supplying powder is connected with described air and powder mixer, the air preheater being positioned at described stove inner flue afterbody and for providing the pressure fan of environment cold wind
Described exhaust steam Water Sproading subsystem comprises: for a part for described exhaust steam carries out the exhaust steam apparatus for recovering of Water Sproading,
Described vapour powder segregation apparatus comprises: described vapour powder mixture is carried out coal dust described in isolated and the coal collector of described exhaust steam,
Described desiccant generating means comprises: is connected with described coal collector and heats thus forms the exhaust steam heater of the superheated steam as described desiccant and described desiccant is delivered in described vapour powder generation drying device the superheat steam pipeline being circulated for carrying the described exhaust steam to described exhaust steam circulating line that is connected with described exhaust steam circulating line of the exhaust steam circulating line of another part of described exhaust steam for the exhaust steam pipeline carrying described exhaust steam, connection on described exhaust steam pipeline
Described exhaust steam heater utilizes the condensation heat drawn gas from described steam turbine that the exhaust steam described exhaust steam heater is thermally formed described superheated steam,
Described machine supplying powder is used for carrying described coal dust extremely described air and powder mixer,
Described air and powder mixer is mixed to get wind powder mixture to First air and the described coal dust from described air-supply powder feeding subsystem,
Described air preheater carries out heating to a part for described environment cold wind and obtains hot blast, a part for described hot blast enters in described air and powder mixer as described First air with another part of described environment cold wind after described First air mixing chamber mixes, another part of described hot blast is directly entered in described coal burner as secondary wind
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 flue gas.
Superheat steam drying powder process type coal generating system the most according to claim 1, it is characterised in that also include:
Gas cleaning subsystem, exports with the afterbody of described stove inner flue and is connected, comprise: the cleaner unit that is sequentially connected with, 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 is connected with described exhaust steam output channel and reclaims the water collector of described condensation water and be connected with described exhaust steam output channel and described exhaust steam is introduced directly into the exhaust steam bypass duct of described desulfurizer for described exhaust steam is condensed into the condenser condensing water and storing.
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 residual air conveyer device of the residual gas of described condenser output,
Described residual air conveyer device comprises: the outlet with described condenser be connected for described residual gas is delivered 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 grinds and is dried the coal pulverizer of the described vapour powder mixture of formation and is connected with the outlet of described coal pulverizer for separating the coarse powder in described vapour powder mixture 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 1, it is characterised in that:
Wherein, described exhaust steam heater comprises: be connected with described Steam Turbine for the extraction line drawn gas described in carrying, for the drain water piping of the described Steam Turbine of hydrophobic return of formation after described exhaust steam heater condensation heat that draws gas described in carrying.
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 is connected for described raw coal carries out the predrying pipe of pre-dried raw coal, steam pipeline with the entrance of described coal pulverizer,
The import of the predrying pipe of described raw coal is communicated on described superheat steam pipeline by described steam pipeline,
Described superheated steam carries out predrying as the described raw coal in predry drying prescription pipe predrying to described raw coal.
Superheat steam drying powder process type coal generating system the most as claimed in any of claims 1 to 7, it is characterised in that:
Wherein, described powder process subsystem also comprises: be connected for carrying the appendix of gas and being located on described appendix the control valve for controlling to open and close described appendix with described exhaust steam circulating line,
Control described appendix by described control valve and carry described gas to described exhaust steam circulating line, as described desiccant after described gas is heated, after Preset Time, described control valve controls the stopping of described appendix to the described exhaust steam circulating line described gas of conveying.
Superheat steam drying powder process type coal generating system the most according to claim 8, it is characterised in that:
Wherein, during described gas is air or industrial inerting gas any one.
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| JP5509024B2 (en) * | 2010-10-12 | 2014-06-04 | 月島機械株式会社 | Coal drying apparatus and coal drying method |
| 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 |
| CN202229208U (en) * | 2011-05-27 | 2012-05-23 | 中国电力工程顾问集团东北电力设计院 | Furnace smoke drying and water recycling warehouse-type fan mill hot air powder supplying and making system |
| CN203116491U (en) * | 2013-03-18 | 2013-08-07 | 施大钟 | Lignite water take-out lignite efficient burning system |
| CN104132364A (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 |
| CN204240389U (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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2014
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