CN104373949B - 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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- CN104373949B CN104373949B CN201410640223.4A CN201410640223A CN104373949B CN 104373949 B CN104373949 B CN 104373949B CN 201410640223 A CN201410640223 A CN 201410640223A CN 104373949 B CN104373949 B CN 104373949B
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- 239000003245 coal Substances 0.000 title claims abstract description 243
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 242
- 239000000843 powder Substances 0.000 title claims abstract description 206
- 238000000034 method Methods 0.000 title claims abstract description 99
- 238000001035 drying Methods 0.000 title claims abstract description 72
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 88
- 239000007789 gas Substances 0.000 claims abstract description 80
- UGFAIRIUMAVXCW-UHFFFAOYSA-N carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 55
- 239000003546 flue gas Substances 0.000 claims abstract description 45
- 239000002274 desiccant Substances 0.000 claims abstract description 42
- 238000000605 extraction Methods 0.000 claims abstract description 32
- 238000009833 condensation Methods 0.000 claims abstract description 26
- 230000005494 condensation Effects 0.000 claims abstract description 26
- 238000005204 segregation Methods 0.000 claims abstract description 10
- 239000002817 coal dust Substances 0.000 claims description 37
- 239000000203 mixture Substances 0.000 claims description 27
- 238000002156 mixing Methods 0.000 claims description 16
- 238000010438 heat treatment Methods 0.000 claims description 15
- 238000004140 cleaning Methods 0.000 claims description 10
- 230000015572 biosynthetic process Effects 0.000 claims description 5
- 238000005755 formation reaction Methods 0.000 claims description 5
- 238000000227 grinding Methods 0.000 claims description 3
- 238000010304 firing Methods 0.000 claims description 2
- 229920001187 thermosetting polymer Polymers 0.000 claims 1
- 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 12
- 229920002456 HOTAIR Polymers 0.000 description 8
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 8
- 238000010248 power generation Methods 0.000 description 7
- 238000010298 pulverizing process Methods 0.000 description 7
- 238000011084 recovery Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 239000002826 coolant Substances 0.000 description 5
- 238000001816 cooling Methods 0.000 description 5
- 239000002737 fuel gas Substances 0.000 description 5
- 210000001519 tissues Anatomy 0.000 description 5
- 238000009423 ventilation Methods 0.000 description 5
- 239000002918 waste heat Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
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- 238000001704 evaporation Methods 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
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- 235000019504 cigarettes Nutrition 0.000 description 3
- 238000007599 discharging Methods 0.000 description 3
- 239000003344 environmental pollutant Substances 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
- 231100000719 pollutant Toxicity 0.000 description 3
- 229910002089 NOx Inorganic materials 0.000 description 2
- 210000003437 Trachea Anatomy 0.000 description 2
- 238000007792 addition Methods 0.000 description 2
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- 239000002802 bituminous coal Substances 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
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- 230000002209 hydrophobic Effects 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N oxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 230000002269 spontaneous Effects 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-N Carbonic acid Chemical compound OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 description 1
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- 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
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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, comprise feed pipe, steam pipeline and steam turbine, wherein, powder process subsystem comprises: vapour powder generates drying device, vapour powder segregation apparatus and desiccant generating means, desiccant generating means comprises: utilize and exhaust steam preheats from the condensation heat drawn gas of steam turbine the exhaust steam extraction heater forming hot weary gas, utilize the exhaust steam flue gas heater that from the flue gas of burner hearth, hot exhaust steam is thermally formed further the superheated steam as desiccant, exhaust steam Water Sproading subsystem comprises: utilize environment cold wind that a part for exhaust steam carries out the exhaust steam apparatus for recovering that condensation is reclaimed.
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 superheat steam drying powder process type coal generating 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.
Further, in the boiler of burning high-moisture coal, released by combustible burning in coal in a large number
Heat is consumed in moisture in coal and is evaporated to water vapour, owing to these moisture are finally to discharge with Properties of Steam
Boiler, quite a few causing the actual heat release of fuel is wasted.Thus, existing high-moisture is coal-fired
It is huge that boiler often shows as Coal-fired capacity, and the pollutant emission of unit generated energy is the most significantly higher.If to characterize
If calculating boiler thermal output on the basis of the high calorific power of the actual thermal discharge of fuel, high-moisture coal-burning boiler
The thermal efficiency is significantly less than general low moisture coal-burning boiler.
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, 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
Rear drive electrical power generators, it is characterised in that including: boiler controller system, produces heat for raw coal carries out burning
Can, utilize heat energy that feedwater heating is obtained high-temperature high-pressure steam, comprise: powder process subsystem, boiler main frame
Subsystem, air-supply powder feeding subsystem and exhaust steam Water Sproading subsystem；And Steam Turbine, utilize high temperature high
Setting-out steam does work thus drives described electromotor, comprises the feed pipe for carrying feedwater, for carrying height
The steam pipeline of temperature high-pressure water vapor and steam turbine, wherein, powder process subsystem comprises: for raw coal
Carry out grinding and by desiccant raw coal be dried thus form the vapour powder of vapour powder mixture and generate and be dried
Device, vapour powder mixture is carried out isolated coal dust and exhaust steam (exhaust steam: typically arranged by Air Dried System
The cryogenic gas gone out is referred to as weary gas, is accustomed to lifting manipulation according to this, the most often claims coal pulverizer outlet in boiler milling system
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 desiccant
Desiccant generating means, boiler host subsystem for feedwater is heated as high-temperature high-pressure steam, bag
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 cold wind, exhaust steam Water Sproading subsystem comprises: with give
Blower fan is connected and utilizes cold wind that a part for exhaust steam carries out the exhaust steam apparatus for recovering that condensation is reclaimed, vapour
Powder segregation apparatus comprises: vapour powder mixture carries out the coal collector of isolated coal dust and exhaust steam, is dried
Agent generating means comprises: be connected with coal collector for the exhaust steam pipeline carrying exhaust steam, connection in exhaust steam
On pipeline, the exhaust steam circulating line for another part of carrying exhaust steam is connected to weary with exhaust steam circulating line
Vapour carries out preheating the exhaust steam extraction heater forming hot weary gas and is connected with exhaust steam extraction heater for inciting somebody to action
Hot exhaust steam is heated further thus is formed the exhaust steam flue gas heater of the superheated steam as desiccant and will do
Drying prescription is delivered to vapour powder and generates the superheat steam pipeline being circulated in drying device, exhaust steam extraction heater profit
With from the condensation heat drawn gas of steam turbine, exhaust steam being thermally formed hot exhaust steam, exhaust steam flue gas heater is sharp
With from the flue gas of burner hearth, hot exhaust steam being thermally formed superheated steam, machine supplying powder is used for pulverized coal conveying to wind powder
Blender, air and powder mixer is mixed to get wind powder to First air and the coal dust from air-supply powder feeding subsystem
Mixture, the cold front heavy rain that the exhaust steam in exhaust steam apparatus for recovering is provided by pressure fan becomes condensation water, cold wind
Exhaust steam apparatus for recovering is preheated by the heat of exhaust steam and obtains warm air, an air preheater part to warm air
Carrying out heating and obtain hot blast, a part for hot blast is made after First air mixing chamber mixes with another part of warm air
Entering in air and powder mixer for First air, another part of hot blast is sent directly into coal burner as secondary wind
In, the coal dust in wind powder mixture is burnt by coal burner, and coal dust and First air, secondary wind are at stove
In thorax, 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: connection exhaust steam output channel on exhaust steam pipeline is with weary
Vapour output channel is connected and utilizes cold wind exhaust steam to be condensed into and condenses the air-cooled condenser of water and store back
Receive and condense the water collector of water and be connected with exhaust steam output channel and exhaust steam is introduced directly into the weary of desulfurizer
Vapour 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, exhaust steam Water Sproading subsystem also comprises: by the residual gas of the outlet output of air-cooled condenser
Carrying out the residual air conveyer device carried, residual air conveyer device comprises: the outlet with air-cooled condenser is connected use
In residual air pipeline residual gas delivered in First air mixing chamber and be connected with residual air pipeline and
Residual gas is 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, exhaust steam extraction heater comprises: be connected the extraction steam pipe drawn gas for conveying with Steam Turbine
Road, for conveying draw gas after exhaust steam extraction heater condensation heat formed hydrophobic return Steam Turbine dredge
Waterpipe.
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, 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 does not constantly have at powder process subsystem
Another part exhaust steam evaporated and produce 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.
Further, the superheated steam in the present invention is to utilize extracted steam from turbine and boiler smoke heating exhaust steam to obtain,
I.e. thermal source in exhaust steam extraction heater comes from the condensation heat that Steam Turbine is drawn gas so that the condensation drawn gas
Heat release is effectively used in the drying capacity of coal pulverizing system, namely the condensation of steam in Steam Turbine is given up
Heat is effectively utilized by steam generator system, and the energy loss of Steam Turbine thermodynamic cycle is greatly reduced.Exhaust steam is passed through
Forming hot exhaust steam after the preheating of exhaust steam extraction heater, hot exhaust steam is further formed temperature by the flue gas of burner hearth
Spend sufficiently high superheated steam so that the drying capacity of powder process subsystem is effectively ensured, and is greatly improved
The generating set adaptation ability to coal-fired moisture change.
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.The cold wind carried by boiler fan
Cooling down exhaust steam as cooling medium in exhaust steam apparatus for recovering, cold wind is preheated formation warm air, and warm air is last
Enter in boiler and burn so that the latent heat of condensation of a large amount of exhaust steam is effectively utilized by boiler, thus can be significantly
Improve boiler thermal output so that the boiler thermal output that coal-fired power station boiler calculates based on coal-fired low heat valve surpasses
Cross 100% to be possibly realized.And, exhaust steam apparatus for recovering is realizing a large amount of water that waste heat recovery is realized simultaneously
The recycling and reuse of resource, have immeasurable environment protection significance to rich coal water-deficient area especially.
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 forms First air and secondary wind, wherein, once after processing cold wind 2 respectively
Raw coal 1 is ground after the coal dust of formation mixes by a certain percentage and sends into boiler main by wind and powder process subsystem 401
In loom system 402, the secondary wind of air-supply powder feeding subsystem 403 is then directly entered in boiler host subsystem 402
Participating in burning, in powder process subsystem 401, isolated a part of exhaust steam is transported to exhaust steam Water Sproading subsystem
404 carry out Water Sproading, and exhaust steam is recovered after being condensed into condensation water and recycles, and heat in exhaust steam
Cold wind 2 (i.e., boiler air-supply) is preheated by (i.e., water recovery heat release) so that by moisture in coal
The latent heat of condensation of a large amount of exhaust steam evaporated and produce is made full use of by boiler, thus significantly improves boiler thermal output.
Another part exhaust steam is become hot weary gas, then by boiler by the heat in the drawing gas of Steam Turbine 502
Flue gas in host subsystem 402 is thermally formed superheated steam further, and superheated steam enters system as desiccant
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.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 extraction heater 33a, exhaust steam flue gas add
Hot device 33b, extraction line 63, drain water piping 64, hot exhaust steam pipeline 34a, superheat steam pipeline 34b, supercharging
Blower fan 35, appendix 52, control valve 51.By exhaust steam extraction heater 33a and exhaust steam flue gas heater 33b
Exhaust steam carries out being formed after two-step heating superheated steam, wherein, the thermal source in exhaust steam extraction heater 33a from
The condensation heat drawn gas in Steam Turbine 502, utilizes the heating exhaust steam of drawing gas of steam turbine 60 to obtain heat weary
Vapour, this hot exhaust steam is thermally formed the superheated steam as desiccant by boiler host subsystem 402 again.
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, be disposed with in the flue that furnace outlet is later soda pop heating surface, air preheater and
Exhaust steam flue gas heater 33b in the present embodiment.
Air-supply powder feeding subsystem 403 includes: machine supplying powder 12, pressure fan 14, warm air pipeline 55, air preheat
Device 15, secondary wind hot air duct 16, First air hot air duct 17, warm air bypass duct 18, First air are mixed
Close room 19, First air booster fan 20, First air pipeline 21, powder feeding pipes 22, air and powder mixer 13.
Air-cooled condenser 37 forms warm air after preheating cold wind 2, and then air preheater 15 is to warm air
Heating obtains hot blast further.
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, air-cooled condenser 37, 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.
Air-cooled condenser 37 has refrigerant inlet and refrigerant exit, and pressure fan 14 exports with air-cooled
The refrigerant inlet of condenser 37 is connected, the refrigerant exit of air-cooled condenser 37 and warm air pipeline 55
One end is connected, the other end of warm air pipeline 55 be connected with the air side import of air preheater 15 and with
One end of warm air bypass duct 18 is connected, and secondary wind is passed through in the air side outlet of air preheater 15 respectively
Hot air duct 16 and First air hot air duct 17 and coal burner 23 and the air intake of First air mixing chamber 19
Mouth is connected.The other end of warm air bypass duct 18 is connected with the air inlet of First air mixing chamber 19, once
Wind mixing chamber 19 is connected with First air booster fan 20, and First air booster fan 20 is by First air pipeline
21 are connected with air and powder mixer 13.
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, the port of export of exhaust steam circulating line 32 and exhaust steam extraction heater 33a
Air inlet be connected, the gas outlet of exhaust steam extraction heater 33a and the air inlet of exhaust steam flue gas heater 33b
Mouth is connected by hot exhaust steam pipe 34a, the gas outlet of exhaust steam flue gas heater 33b and superheat steam pipeline 34b
One end be connected, the other end of superheat steam pipeline 34 is connected with the entrance of booster fan 35, supercharging
The outlet of blower fan 35 is connected with coal pulverizer 7.Appendix 52 is connected with exhaust steam circulating line 32, control valve
51 are 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 air-cooled condenser 37 is connected, and exhaust steam bypass duct 41 is in parallel with air-cooled condenser 37, condenses water and returns
Receive device 40 to be connected with air-cooled condenser 37, for storing the condensation water reclaimed by air-cooled condenser 37, wind
The residual air outlet of cold condenser 37 is connected with the import of air ejector 38, and the outlet of air ejector 38 connects respectively
One end of residual air pipeline 39 and one end of residual air bypass duct 42, the other end of residual air bypass duct 42 connects
Desulfurizer 28, the other end of residual air pipeline 39 connects First air mixing chamber 19.Through air-cooled condenser 37
Remaining incondensable gas (hereinafter referred to as residual gas) after recycle-water steam, this residual gas is through excess enthalpy
Feed channel 39 enters First air mixing chamber 19 and enters in burner hearth as First air so that may in residual gas
The fuel gas contained is abundant after-flame in burner hearth, it addition, residual gas can also be through residual air bypass duct
42 enter in desulfurizer 28.This residual gas is other incoagulable gas of mixing in water vapour, such as
Leak into the air of exhaust steam apparatus for recovering and fuel gas that raw coal 1 volatilizes 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 feed pipe 61 of Steam Turbine 502 and giving of Steam Turbine 502
Water out is connected, and the other end is connected with boiler host subsystem 402, one end of steam pipeline 62 with
Boiler host subsystem 402 is connected, and the other end is connected with the steam inlet of Steam Turbine 502, steamer
Unit 502 is connected by the import of extraction line 63 with exhaust steam extraction heater 33a, and Steam Turbine
502 are connected by the outlet of drain water piping 64 with exhaust steam extraction heater 33b, extract out from steam turbine 60
Draw gas to be entered in exhaust steam extraction heater 33a by extraction line 63 and exhaust steam is heated, shape of drawing gas afterwards
Become hydrophobic and flow back into Steam Turbine 502 by drain water piping 64.
Fig. 4 is the flow chart of superheat steam drying powder process type coal generating system in the present embodiment.
As shown in Figure 4, the operation principle of superheat steam drying powder process type coal generating system 501:
The flow process (step S1-S4) of coal: raw coal 1 is delivered into coal pulverizer 7 by run coal bin 5 through feeder 6,
Raw coal 1 is milled into coal dust in coal pulverizer 7, is entered after the desiccant dryness of coal pulverizer 7 from mill simultaneously
Exporting in coal machine 7, the mixture of exhaust steam and the coal dust of coal pulverizer 7 outlet is i.e., vapour powder mixture is through coarse powder
During separator 8, coarse powder is separated and reenters in coal pulverizer 7 and again grinds.Divide through coarse powder
Vapour powder mixture from device 8 enters coal collector 10 by powder process pipeline 9, and coal collector 10 is by vapour powder
Exhaust steam and coal dust in mixture are isolated, and coal dust is stored by Pulverized Coal Bin 11, the coal in Pulverized Coal Bin 11
Powder is sent into air and powder mixer 13 by machine supplying powder 12, in air and powder mixer 13 and from First air mixing chamber 19
First air mixing, then by powder feeding pipes 22 be sent to coal burner 23 enter in burner hearth with secondary wind one
Combust heating feedwater obtains high-temperature high-pressure steam, forms flue gas after coal dust firing.
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, cold wind 2 (i.e., boiler air-supply)
Air-cooled condenser 37 is sent into as cooling medium for cooling down the exhaust steam in air-cooled condenser 37 by pressure fan 14,
Forming warm air after cold wind 2 is preheated by the heat of exhaust steam simultaneously, part warm air enters air by warm air pipeline 55
It is thermally formed hot blast further by flue gas in preheater 15.The hot blast of air preheater 15 air side outlet is big
Part is directly drawn toward coal burner 23 through secondary wind hot air duct 16 as secondary wind.Another small part hot blast
In First air mixing chamber 19, carry out being mixed to form First air with the warm air of warm air bypass duct 18 conveying, temperature
The warm air of wind bypass duct 18 conveying can regulate the temperature of First air, and First air is through by First air booster fan
Enter air and powder mixer 13 through First air pipeline 21 after supercharging, and then coal dust is sent in burner hearth burn.
Flue gas flow (step S5): coal dust and air generate flue gas, in burner hearth at the stove chamber inner combustion of boiler 19
Flue gas from stove inner flue discharge, at stove inner flue afterbody to air preheater 15 and exhaust steam flue gas heater 33b
Heating, the flue gas removing dust device 25 of discharge enters air-introduced machine 27 by smoke discharging pipe 26 after purifying, it
In rear entrance desulfurizer 28, through the flue gas 3 of desulfurizing and purifying by chimney 29 row to atmospheric environment.
Fig. 5 is the block diagram of powder process subsystem in the embodiment of the present invention.
As it is shown in figure 5, 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 extraction heater 33a at coal pulverizer 7
It is referred to as exhaust steam, between exhaust steam flue gas heater 33b gas outlet and coal pulverizer 7 entrance, is referred to as superheated steam.
Exhaust steam separates in coal collector 10 with coal dust, and isolated exhaust steam is extracted out also by exhaust steam blower fan 31
Being divided into two parts, a part of exhaust steam is sent into exhaust steam extraction heater 33a and exhaust steam cigarette by exhaust steam circulating line 32
Hot-air heater 33b carries out being thermally formed superheated steam, this superheated steam as desiccant through overheated steam pipe
Road 34b sends into coal pulverizer 7, is dried the raw coal 1 entering coal pulverizer 7, the vapour powder of coal pulverizer 7 outlet
Mixture is isolated coal dust by coal collector 10 and exhaust steam forms, and exhaust steam now is by the mistake as desiccant
The moisture composition that vapours and raw coal 1 evaporate, from one of the exhaust steam that coal collector 10 venthole is discharged
Divide and enter in exhaust steam extraction heater 33a and exhaust steam flue gas heater 33b and as desiccant at powder process
Circulation in system 401, another part exhaust steam is sent into air-cooled condenser 37 through exhaust steam output channel 36 and is carried out
Reclaim.Exhaust steam is cooled by cold wind 2 in air-cooled 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 from Steam Turbine 502
Drawing gas, this draws gas and heats the exhaust steam in exhaust steam extraction heater 33a, produces as hot exhaust steam.
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, close the valve on residual air pipeline 39, make this
Residual gas 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
Point circulation exhaust steam that evaporation is formed is through carrying out pre-warmed exhaust steam to draw gas in Steam Turbine and draw gas for adding thermal medium
Heater and the exhaust steam flue gas heater heated further through flue gas again are thermally formed, superheat steam temperature with
Flow meets powder process subsystem drying capacity and the requirement of coal pulverizer ventilation respectively, except in powder process subsystem
Outside the circulation exhaust steam of circulation work, constantly evaporation and another portion of producing in powder process subsystem because of moisture in coal
Divide output exhaust steam, carried out waste heat and Water Sproading with boiler air-supply for cooling medium by exhaust steam Water Sproading subsystem,
And the heat in exhaust steam is simultaneously used for preheating cold wind.
Further, the superheated steam in the present embodiment is to use two-step heating, weary first with extracted steam from turbine heating
The thermal source that vapour obtains in hot exhaust steam, i.e. exhaust steam extraction heater comes from the condensation heat that Steam Turbine is drawn gas,
Make the condensation heat drawn gas effectively be used in the drying capacity of coal pulverizing system, namely make Steam Turbine
The condensation used heat of middle steam is effectively utilized by steam generator system, and the energy of Steam Turbine thermodynamic cycle is greatly reduced
Loss, hot exhaust steam is further formed the sufficiently high superheated steam of temperature by the flue gas of burner hearth so that system
The drying capacity of powder subsystem is effectively ensured, and generating set is greatly improved and fits coal-fired moisture change
Should be able to power.
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.Defeated by boiler fan
The cold wind sent cools down exhaust steam as cooling medium in exhaust steam apparatus for recovering, and cold wind is preheated formation warm air,
Warm air finally enters in boiler burns so that the latent heat of condensation of a large amount of exhaust steam is effectively utilized by boiler, by
This can be greatly improved boiler thermal output so that the boiler that coal-fired power station boiler calculates based on coal-fired low heat valve
The thermal efficiency is possibly realized more than 100%.And, exhaust steam apparatus for recovering is realized realizing waste heat recovery while
The recycling and reuse of great lot of water resources, 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 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 carrying the feed pipe of described feedwater, for carrying steam pipeline and the vapour of described high-temperature high-pressure 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 cold wind,
Described exhaust steam Water Sproading subsystem comprises: is connected with described pressure fan and utilizes described cold wind to institute
The part stating exhaust steam carries out the exhaust steam apparatus for recovering that condensation is reclaimed,
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 is connected with described exhaust steam circulating line and preheats the described exhaust steam in described exhaust steam circulating line
The exhaust steam extraction heater forming hot weary gas is connected for by weary for described heat with described exhaust steam extraction heater
Vapour heats further thus forms the exhaust steam flue gas heater of the superheated steam as desiccant and by described dry
Drying prescription is delivered to described vapour powder and generates the superheat steam pipeline being circulated in drying device,
Described exhaust steam extraction heater utilizes the condensation heat drawn gas of described steam turbine to add described exhaust steam
Hot exhaust steam described in thermosetting,
It is described that described exhaust steam flue gas heater utilizes the flue gas of described burner hearth to be thermally formed described hot exhaust steam
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,
The described cold front heavy rain that exhaust steam in described exhaust steam apparatus for recovering is provided by described pressure fan becomes condensation
Water, described cold wind is preheated by the heat of described exhaust steam in described exhaust steam apparatus for recovering and obtains warm air,
Described air preheater carries out heating to a part for described warm air and obtains hot blast, of described hot blast
Divide and enter as described First air described after described First air mixing chamber mixes with another part of described warm air
In air and powder mixer, 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 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 cold wind described exhaust steam to be condensed into and condense the air-cooled of water
Condenser and store reclaim the water collector of described condensation water and be connected with described exhaust steam output channel and incite somebody to action
Described exhaust steam is introduced directly into the exhaust steam bypass duct of described desulfurizer.
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 air-cooled condenser output
The residual air conveyer device of residual air body,
Described residual air conveyer device comprises: the outlet with described air-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 1, it is characterised in that:
Wherein, described exhaust steam extraction heater comprises: is connected described in carrying with described Steam Turbine and takes out
The extraction line of vapour, the dredging of being formed after described exhaust steam extraction heater condensation heat of drawing gas described in carry
Water returns the drain water piping of described Steam Turbine.
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, 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 7,
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 8, it is characterised in that:
Wherein, during described gas is air or industrial inerting gas any one.
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|---|---|---|---|
| CN201410640223.4A CN104373949B (en) | 2014-11-13 | Superheat steam drying powder process type coal generating system |
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| CN201410640223.4A CN104373949B (en) | 2014-11-13 | Superheat steam drying powder process type coal generating system |
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| CN204240383U (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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