CN104373950B - Superheat steam drying powder process type coal generating system - Google Patents
Superheat steam drying powder process type coal generating system Download PDFInfo
- Publication number
- CN104373950B CN104373950B CN201410640227.2A CN201410640227A CN104373950B CN 104373950 B CN104373950 B CN 104373950B CN 201410640227 A CN201410640227 A CN 201410640227A CN 104373950 B CN104373950 B CN 104373950B
- Authority
- CN
- China
- Prior art keywords
- steam
- exhaust steam
- coal
- air
- powder
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- 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
- 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 the desiccant generating means of generation desiccant, exhaust steam Water Sproading subsystem comprises: utilize the low-temperature condensate of Steam Turbine and environment cold wind that a part for exhaust steam carries out the exhaust steam apparatus for recovering that condensation is reclaimed, environment cold wind is preheated by the heat of exhaust steam in exhaust steam apparatus for recovering and obtains warm air, air preheater carries out heating to a part for warm air and obtains hot blast, exhaust steam extraction heater utilizes, from the condensation heat drawn gas of steam turbine, exhaust steam is thermally formed hot exhaust steam, exhaust steam flue gas heater utilizes the flue gas from burner hearth that hot exhaust steam is thermally formed superheated steam.
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 generating system of the heat that draws gas of steam turbine.
Background technology
China is the country of a rich coal few oil deficency, and coal is constantly in core leading position in China's energy supply, and 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, thus coal is at home and abroad mainly used in generating.At present in China, the 55% of coal total output is for coal-fired thermal power generation, and in terms of power supply architecture, thermal power generation is the main generation mode of China, and the supply of electric power of China about 80% comes from fired power generating unit.China newly builds a power station still based on coal fired power plant at present, and electricity coal ratio in coal total output the most quickly increases.But, coal fired power generation also discharges substantial amounts of pollutant, including SO while producing electric power2, flue dust, NOXAnd CO2Deng；And, the generating net efficiency of China's coal fired power plant is compared with developed country still bigger gap.Thus, further improve efficiency of energy utilization thus not only reduce energy resource consumption but also reduce pollutant emission, become China's power industry or even whole national economy realizes the important the most urgent task of sustainable development.
In recent years, along with power coal price quickly goes up and high-quality coal reserves being gradually reduced of ratio in coal gross reserves, high water content brown coal combustion power generation is utilized to become the outstanding problem that power industry pays high attention to.In worldwide, 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, a 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 brown coal；Remaining brown coal is mainly distributed on Yunnan Province, and these brown coal total moistures are 40～60%, containing wood fibre, belongs 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 at present brown coal utilize is by electric power stations near coal-mines combustion power generation, brown coal and bituminous coal fired boiler many employings unit pulverized-coal system, is 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 gas emissions are the biggest.And, for high water content brown coal, unit pulverized-coal system is used to make in boiler First air containing the inert media such as a large amount of stove cigarettes and water vapour, in addition fire box temperature is the lowest, high water content brown coal is made to there is prominent combustion instability problem, causing boiler to be difficult to safely and reliably to run, this seriously constrains effective utilization of domestic and international high water content brown coal.Simultaneously as brown coal reactivity is high, brown coal coal dust is inflammable and explosive, and the burning of brown coal pulverized coal preparation system and explosion issues are also long-term outstanding problems always perplexing lignite-fired unit safe and reliable operation.
Additionally, the coal prognostic reserves being positioned at Xinjiang of China In The Eastern Junggar Basin " coalfield, quasi-east " reach 390,000,000,000 tons, it it is the self-contained coalfield of China's maximum.Quasi-east coal is in addition to caloric value relatively brown coal height, and other coal characteristic is similar to brown coal, it may have moisture height (22～32%), volatile matter are high, ash fusion point is low, abrasiveness is low and the feature of easy spontaneous combustion.The large-sized station boiler of pin alignment eastern coal exploitation all uses unit pulverized-coal system the most in the industry, therefore burns for stable in ensureing pulverized coal preparation system drying capacity and stove, and boiler all have employed the highest hot blast temperature and primary air ratio.The result thereby resulted in is that the exhaust gas temperature of these quasi-east coal burning boilers is universal higher (exhaust gas temperature is typically more than 140 DEG C), causes boiler thermal output and unit generation efficiency the most relatively low accordingly；And, too 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 is 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, in a large number by combustible burning in coal, liberated heat is consumed in moisture in coal and is evaporated to water vapour, and owing to these moisture are finally to discharge boiler with Properties of Steam, quite a few causing the actual heat release of fuel is wasted.Thus, it is huge that existing high-moisture coal-burning boiler often shows as Coal-fired capacity, and the pollutant emission of unit generated energy is the most significantly higher.If if calculating boiler thermal output on the basis of the high calorific power characterizing the actual thermal discharge of fuel, the thermal efficiency of high-moisture coal-burning boiler is significantly less than general low moisture coal-burning boiler.
In recent years, thermal power industry extensive concern improves power plants generating electricity efficiency further by the deep exploitation of boiler exhaust gas waste heat, typical mode is layout low-pressure coal saver in boiler exhaust gas flue, the unit utilizing smoke discharging residual heat heating low temperature condenses water, thus reduce the low-pressure heater amount of drawing gas, reach to improve the purpose of power plant efficiency.Obviously, utilize the feature that unit condensing water temperature is low carry out waste heat recovery be power plant improve generating efficiency thus obtain one of effective way of energy-saving and emission-reduction benefit, but because the coefficient of heat transfer of flue gas is low, in addition flue gas and the heat transfer temperature difference condensed between water are less, make the low-pressure coal saver being condensed water by flue gas bulky, investment payback time is longer, and arranges more difficulty in power plant.
On the other hand, China's brown coal major production areas (Eastern Inner Mongolia) and quasi-coal producing region, east (Xinjiang region) are extreme dehydration area.Owing to fired power generating unit needs to consume a large amount of water, water resources shortage has had become as these areas to be carried out power supply construction of base thus develops brown coal and the primary restraining factors of quasi-east coal resource.It is well known, however, that pulverized coal preparation system is also simultaneously a drying system, for ensureing that breeze airflow enters furnace rear and stably burns, it is desirable to raw coal is dried to the lowest coal dust moisture of moisture content by pulverized coal preparation system.Fuel coal of power station boiler amount is huge, therefore a large amount of moisture in coal is evaporated to water vapour in pulverized coal preparation system and enters burner hearth with coal dust, one of constituent becoming 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 water resources shortage becomes the important restriction factor affecting near coal-mine power supply construction of base.Thus, if moisture in coal can be reclaimed, China's brown coal and quasi-east coal utilization are had very important ecological protection meaning.But due to dry flue gas (mainly N a large amount of in stove2、CO2And excess dry air) dilution, water capacity and the aqueous dew point temperature of boiler exhaust gas are the lowest, and this makes to become extremely difficult by cooling boiler exhaust gas thus moisture in recovered flue gas.As a example by the in-service 600MW unit of certain combustion total moisture 40% brown coal, its boiler exhaust gas amount is 2800t/h, although containing 270t/h moisture in smoke evacuation, 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 and water dew point is low, reclaim moisture in smoke evacuation and need huge flue gas cooling heat exchanger and the of a sufficiently low a large amount of cooling mediums of temperature, it is extremely difficult with water recovery latent heat that this makes to reclaim moisture from smoke evacuation, does not has so far by cooling station boiler smoke evacuation thus realizes 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 provides one to have prominent Water Sproading benefit and energy-saving benefit, but also can guarantee that pulverized coal preparation system safe operation and efficiency of fire coal higher superheat steam drying powder process type coal generating system.
The present invention provides a kind of superheat steam drying powder process type coal generating system, for burning to drive electrical power generators to raw coal, it is characterized in that, including: boiler controller system, heat energy is produced for raw coal being carried out burning, and utilize heat energy that feedwater heating is obtained high-temperature high-pressure steam, comprise: powder process subsystem, boiler host subsystem, air-supply powder feeding subsystem and exhaust steam Water Sproading subsystem；nullAnd Steam Turbine，Utilize high-temperature high-pressure steam acting thus drive electrical power generators，Comprise the feed pipe for carrying feedwater、For carrying the steam pipeline of high-temperature high-pressure steam、And steam turbine，Wherein，Powder process subsystem comprises: form the vapour powder generation drying device of vapour powder mixture for grinding raw coal and being dried raw coal by desiccant、Vapour powder mixture is carried out the vapour powder segregation apparatus of isolated coal dust and exhaust steam、And generate the desiccant generating means of desiccant，Boiler host subsystem is for being heated as high-temperature high-pressure steam by feedwater，Comprise: burner hearth、The stove inner flue being connected with furnace outlet、It is positioned at the coal burner of burner hearth entry position，Air-supply powder feeding subsystem comprises: be connected for the machine supplying powder of pulverized coal conveying with vapour powder segregation apparatus、The air and powder mixer being connected with machine supplying powder、The First air mixing chamber being connected with air and powder mixer、It is positioned at the air preheater of stove inner flue afterbody、And for providing the pressure fan of cold wind，Exhaust steam Water Sproading subsystem comprises: being connected with Steam Turbine and being connected with pressure fan utilizes the low-temperature condensate of Steam Turbine and 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，Desiccant generating means comprises: be connected the exhaust steam pipeline for carrying exhaust steam with coal collector、Connection is used for carrying the exhaust steam circulating line of another part of exhaust steam on exhaust steam pipeline、It is connected with exhaust steam circulating line and the exhaust steam in exhaust steam circulating line is preheated the exhaust steam extraction heater forming hot exhaust steam、It is connected with exhaust steam extraction heater and forms the exhaust steam flue gas heater of the superheated steam as desiccant for hot exhaust steam being heated further、And desiccant is delivered in vapour powder generation drying device the superheat steam pipeline being circulated，Exhaust steam extraction heater utilizes the condensation heat drawn gas of steam turbine that exhaust steam is thermally formed hot exhaust steam，Exhaust steam flue gas heater utilizes the flue gas of burner hearth that hot exhaust steam is thermally formed superheated steam，Machine supplying powder is used for pulverized coal conveying to air and powder mixer，Air and powder mixer is mixed to get wind powder mixture to First air and the coal dust from air-supply powder feeding subsystem，The cold wind condensation that exhaust steam in exhaust steam apparatus for recovering is provided by low-temperature condensate and the pressure fan of Steam Turbine becomes condensation water，Cold wind is preheated by the heat of exhaust steam in exhaust steam apparatus for recovering and obtains warm air，Air preheater carries out heating to a part for warm air and obtains hot blast，A part for hot blast enters in air and powder mixer as First air after First air mixing chamber mixes with another part of warm air，Another part of hot blast is directly entered in coal burner as secondary wind，Coal dust in wind powder mixture is burnt by coal burner，Coal dust and First air、Secondary wind is burnt in burner hearth and is generated flue gas.
In the superheat steam drying powder process type coal generating system that the present invention provides, can have the feature that, also include: gas cleaning subsystem, export with the afterbody of stove inner flue and be connected, comprise: the cleaner unit that is sequentially connected with, air-introduced machine, desulfurizer, chimney.
In the superheat steam drying powder process type coal generating system that the present invention provides, can also have a feature in that wherein, exhaust steam apparatus for recovering includes: connection exhaust steam output channel on exhaust steam pipeline, it is connected with exhaust steam output channel and utilizes low-temperature condensate and cold wind that exhaust steam is condensed into the condenser condensing water, store and reclaim the water collector condensing water, and be connected with exhaust steam output channel exhaust steam is introduced directly into the exhaust steam bypass duct of desulfurizer, condenser comprises the cold water inlet being connected with Steam Turbine, and the cold water outlet pipe being connected with Steam Turbine, exhaust steam is condensed in cold water inlet flows into condenser by low-temperature condensate, low-temperature condensate flows back in Steam Turbine through subcooled water outlet pipe after being heated by exhaust steam.
In the superheat steam drying powder process type coal generating system that the present invention provides, can also have a feature in that wherein, exhaust steam Water Sproading subsystem also comprises: for carrying the residual air conveyer device of residual gas of condenser output, residual air conveyer device comprises: is connected with the outlet of condenser for the residual air pipeline being delivered into by residual gas in First air mixing chamber and is connected with residual air pipeline and residual gas is introduced directly into the residual air bypass duct of desulfurizer.
In the superheat steam drying powder process type coal generating system that the present invention provides, can also have a feature in that wherein, vapour powder generates drying device and also comprises: grinds raw coal and is dried the coal pulverizer forming vapour powder mixture and is connected for the mill separator separated the coarse powder in vapour powder mixture and send back in coal pulverizer by coarse powder with the outlet of coal pulverizer.
In the superheat steam drying powder process type coal generating system that the present invention provides, can also have a feature in that wherein, vapour powder generates drying device and also comprises: outlet is connected for raw coal carries out the predrying pipe of pre-dried raw coal and steam pipeline with the entrance of coal pulverizer, the import of the predrying pipe of raw coal is communicated on superheat steam pipeline by steam pipeline, and superheated steam carries out predrying as the raw coal in predry drying prescription pipe predrying to raw coal.
In the superheat steam drying powder process type coal generating system that the present invention provides, can also have a feature in that wherein, exhaust steam extraction heater comprises: be connected with Steam Turbine for carrying extraction line, the drain water piping of the hydrophobic return Steam Turbine formed after exhaust steam heater condensation heat of drawing gas for conveying drawn gas.
In the superheat steam drying powder process type coal generating system that the present invention provides, can also have a feature in that wherein, powder process subsystem also comprises: be connected for carrying the appendix of gas and being located on appendix the control valve for controlling to open and close appendix with exhaust steam circulating line, control appendix by control valve and carry gas to exhaust steam circulating line, as desiccant after gas is heated, after Preset Time, control valve controls appendix stopping to exhaust steam circulating line conveying gas.
The present invention provide superheat steam drying powder process type coal generating system in, it is also possible to have a feature in that 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 be with superheated steam be powder process subsystem desiccant and ventilation medium, and the circulation exhaust steam that the moisture evaporation that superheated steam is generated in the raw coal in drying device by vapour powder is formed is through being thermally formed with the condensation heat of extracted steam from turbine, 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, another part exhaust steam constantly produced in the evaporation of powder process subsystem because of former moisture in coal is carried out Water Sproading by exhaust steam Water Sproading subsystem.
The desiccant that the present invention is powder process subsystem with superheated steam, whole powder process subsystem is made to run under complete inerting atmosphere, ensure 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, pulverizing process is not required to extra steam, nitrogen production system, also without consuming other medium such as flue gas, hot blast so that pulverizing process 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 poor being burst caused in a large number by coal grain in conventional furnace smoke drying and hot-air drying process, thus contribute to improving coal powder performance, improve Combustion Efficiency of Coal Powder.
The cold wind carried by pressure fan cools down exhaust steam as cooling medium in exhaust steam apparatus for recovering, cold wind is preheated formation warm air, warm air finally enters in boiler burns, the a large amount of latent heats of condensation making exhaust steam are effectively utilized by boiler, boiler thermal output thus can be greatly improved so that the boiler thermal output that coal-fired power station boiler calculates based on coal-fired low heat valve is possibly realized more than 100%.When ensureing only to be not sufficient enough to reclaim exhaust steam residual heat by boiler air-supply cooling on the premise of optimal warm air temperature, the present invention is further by cooling down exhaust steam as cooling medium from the low-temperature condensate in Steam Turbine in exhaust steam apparatus for recovering, low-temperature condensate returns Steam Turbine after being heated to uniform temperature thus reduces the low-pressure heater amount of drawing gas, so that the latent heat of condensation of exhaust steam is effectively utilized by Steam Turbine therrmodynamic system, thus improve power plants generating electricity efficiency further.By air-cooled and two kinds of waste heat recovery modes of water-cooled combination application, exhaust steam Water Sproading effect can be fully ensured that, and by air-cooled and water-cooled heat optimized distribution, the generating efficiency of electricity generation system can be made to reach the highest, and regulation during electricity generation system variable load operation can be made more flexible and convenient.Additionally, with existing by compared with the low-pressure coal saver of flue gas, in the present invention, volume and the cost of investment of water-cooled condenser all can be greatly reduced.
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, the condensation heat drawn gas is made effectively to be used in the drying capacity of coal pulverizing system, namely the condensation used heat of steam in Steam Turbine is effectively utilized by steam generator system, the cold source energy of steam turbine thermodynamic cycle is greatly reduced.Exhaust steam forms hot exhaust steam after exhaust steam extraction heater preheats, hot exhaust steam is further formed the sufficiently high superheated steam of temperature by the flue gas of burner hearth, the drying capacity making powder process subsystem is effectively ensured, and generating set adaptation ability to coal-fired moisture change is greatly improved.
The water vapour that the present invention produces with powder process subsystem internal completely is as desiccant with defeated powder medium so that waste heat recovery and the Water Sproading of the almost powder process exhaust steam of either pure steam become 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, exhaust steam apparatus for recovering is realizing the recycling and reuse of the great lot of water resources that waste heat recovery is realized simultaneously, 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 so that coal quantity significantly improves.This coal dust after drying and upgrading is sent into boiler by uniform temperature air and is burnt, and will not have the low combustion instability of in-furnace temperature, low NO againXThe problems such as burning tissues burning difficulty.Meanwhile, using 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 combustion stability and the efficiency of combustion that both improve breeze airflow, and the low NOx combustion tissue also making breeze airflow is convenient, thus realizes clean and effective and stably burn.And, this coal dust after drying and upgrading is sent into boiler combustion by the First air in powder feeding subsystem of blowing with uniform temperature, and the moisture from the raw coal that powder process subsystem evaporates no longer enters boiler with powder feeding medium, boiler exhaust gas amount is reduced in a large number, corresponding exhaust gas temperature also can reduce, finally making boiler exhaust gas heat loss be greatly reduced, boiler thermal output significantly improves.
Therefore, the superheat steam drying powder process type coal generating system that the present invention can provide has prominent Water Sproading benefit and energy-saving benefit.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of superheat steam drying powder process type coal generating system in the embodiment of the present invention；
Fig. 2 is the structured flowchart of boiler controller system in the embodiment of the present invention；
Fig. 3 is the structural representation of superheat steam drying powder process type coal generating system in the embodiment of the present invention；
Fig. 4 is the flow chart of superheat steam drying powder process type coal generating system in the embodiment of the present invention；
Fig. 5 is the block diagram of air-supply powder feeding subsystem in the embodiment of the present invention；
Fig. 6 is the block diagram of powder process subsystem in the embodiment of the present invention.
Detailed description of the invention
For the technological means making the present invention realize, creation characteristic, reaching purpose and be easy to understand with effect, following example are described in detail the present invention relates to superheat steam drying powder process type coal generating system in conjunction with the accompanying drawings and embodiments.
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, Steam Turbine 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 and enters Steam Turbine 502 and do work water, and then drives generating set 503 to generate electricity.
Fig. 2 is the structured flowchart of boiler controller system in the embodiment of the present invention.
As in figure 2 it is shown, boiler controller system 501, including: powder process subsystem 401, boiler host subsystem 402, air-supply powder feeding subsystem 403, exhaust steam Water Sproading subsystem 404 and gas cleaning subsystem 405.
Air-supply powder feeding subsystem 403 and exhaust steam Water Sproading subsystem 404 form First air and secondary wind after processing cold wind 2 respectively, wherein, raw coal 1 is ground after the coal dust of formation mixes by a certain percentage by First air and powder process subsystem 401 to be sent in boiler host subsystem 402, the secondary wind of air-supply powder feeding subsystem 403 is then directly entered in boiler host subsystem 402 participation burning, in powder process subsystem 401, isolated a part of exhaust steam is transported to exhaust steam Water Sproading subsystem 404 and carries out Water Sproading, exhaust steam is recovered after being condensed into condensation water by the cold wind of the low-temperature condensate in Steam Turbine 502 and air-supply powder feeding subsystem 403 and recycles, and heat is (i.e. in exhaust steam, water recovery heat release) cold wind 2 is preheated, heat in water vapour is fully utilized.Another part exhaust steam is heated as superheated steam by the high-temperature flue gas of boiler host subsystem 402, enters in powder process subsystem 401 as desiccant afterwards.The flue gas of boiler host subsystem 402 finally 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 high-temperature high-pressure steam thus drives electromotor unit 503 to generate electricity.Steam Turbine 502 comprises feed pipe 61, steam pipeline 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 and forms vapour powder mixture for raw coal 1 being ground and utilized the desiccant of desiccant generating means generation be dried raw coal 1, by isolated coal dust and exhaust steam after primary mixture entrance vapour powder segregation apparatus, 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 circulate work in powder process subsystem 401, and another part exhaust steam is recycled after being condensed into condensation water by exhaust steam Water Sproading subsystem 404.
Vapour powder generates drying device and comprises: run coal bin 5, feeder 6, coal pulverizer 7, mill separator 8.Vapour powder 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 heater 33b, extraction line 63, drain water piping 64, hot exhaust steam pipeline 34a, superheat steam pipeline 34b, booster fan 35, appendix 52, control valve 51.Superheated steam is formed after exhaust steam being carried out two-step heating by exhaust steam extraction heater 33a and exhaust steam flue gas heater 33b, wherein, the condensation heat of the low-pressure pumping steam that the thermal source in exhaust steam extraction heater 33a comes from Steam Turbine 502 in steam turbine 60, the heating exhaust steam of drawing gas utilizing steam turbine 60 obtains hot exhaust steam, and 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: boiler main frame 24, coal burner 23.Boiler main frame 24 includes burner hearth (being not drawn in figure) and the stove inner flue (being not drawn in figure) being connected with burner hearth outlet flue.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, so that flue gas temperature of hearth outlet is within the scope of suitably, is disposed with soda pop heating surface, air preheater in the flue that furnace outlet is later.
Air-supply powder feeding subsystem 403 includes: machine supplying powder 12, pressure fan 14, warm air pipeline 55, air preheater 15, secondary wind hot air duct 16, First air hot air duct 17, warm air bypass duct 18, First air mixing chamber 19, First air booster fan 20, First air pipeline 21, powder feeding pipes 22, air and powder mixer 13.Condenser 37 forms warm air after preheating cold wind 2, and then air preheater 15 heating further to warm air obtains hot blast.
Exhaust steam Water Sproading subsystem 404 includes: exhaust steam apparatus for recovering and residual air conveyer device.Exhaust steam apparatus for recovering comprises: exhaust steam output channel 36, condenser 37, cold water inlet 65, cold water outlet pipe 66, exhaust steam bypass duct 41, water collector 40.Residual air conveyer device comprises: air ejector 38, residual air pipeline 39 and residual air bypass duct 42.
Gas cleaning subsystem 405 includes: cleaner unit 25, smoke discharging pipe 26, air-introduced machine 27, desulfurizer 28 and chimney 29.
The annexation of superheat steam drying powder process type coal generating system 501 entirety:
Run coal bin 5, feeder 6, coal pulverizer 7, powder process pipeline 9 and coal collector 10 are sequentially connected with, mill separator 8 is located at the top of coal pulverizer 7 and is connected with coal pulverizer 7, the venthole of coal collector 10 is connected with one end of exhaust steam pipeline 30, the coal outlet of coal collector 10 is connected with the import of Pulverized Coal Bin 11, the outlet of Pulverized Coal Bin 11 is connected with machine supplying powder 12, machine supplying powder 12 is connected with the powder inlet of air and powder mixer 13, the outlet of air and powder mixer 13 is connected with one end of powder feeding pipes 22, and the other end of powder feeding pipes 22 is connected with coal burner 23.Stove inner flue is connected with the outlet of burner hearth, and air preheater 15 is positioned at the afterbody of stove inner flue.
Condenser 37 has two refrigerant inlet and two refrigerant exits accordingly, one refrigerant inlet of condenser 37 is connected with one end of cold water inlet 65, the other end of cold water inlet 65 is connected with Steam Turbine 502, is connected with Steam Turbine 502 by cold water outlet pipe 66 with this refrigerant inlet refrigerant exit accordingly.The low-temperature condensate of Steam Turbine 502 is entered in condenser 37 by cold water inlet 65 and condenses exhaust steam, then flows back to Steam Turbine 502 by cold water outlet pipe 66.Pressure fan 14 outlet is connected with another refrigerant inlet of condenser 37, it is connected with one end of warm air pipeline 55 with this refrigerant inlet another refrigerant exit accordingly, the other end of warm air pipeline 55 is connected with the air side import of air preheater 15 and is connected with one end of warm air bypass duct 18, and the air side outlet of air preheater 15 is connected with the air inlet of First air hot air duct 17 with coal burner 23 and First air mixing chamber 19 by secondary wind hot air duct 16 respectively.The other end of warm air bypass duct 18 is connected with the air inlet of First air mixing chamber 19, and First air mixing chamber 19 is connected with First air booster fan 20, and First air booster fan 20 is connected with air and powder mixer 13 by First air pipeline 21.
The entrance of exhaust steam pipeline 30 is connected with the gas outlet of coal collector 10.Exhaust steam blower fan 31 is located on exhaust steam pipeline 30, for extracting the exhaust steam in coal collector 10.The arrival end of exhaust steam circulating line 32 is connected with the outlet of exhaust steam pipeline 30, the port of export of exhaust steam circulating line 32 is connected with the air inlet of exhaust steam extraction heater 33a, the gas outlet of exhaust steam extraction heater 33a is connected by hot exhaust steam pipe 34a with the air inlet of exhaust steam flue gas heater 33b, the gas outlet of exhaust steam flue gas heater 33b is connected with one end of superheat steam pipeline 34b, the other end of superheat steam pipeline 34 is connected with the entrance of booster fan 35, and the outlet of booster fan 35 is connected with coal pulverizer 7.Appendix 52 is connected with exhaust steam circulating line 32, and control valve 51 is located on appendix 52 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 is connected with the import of condenser 37, exhaust steam bypass duct 41 is in parallel with condenser 37, water collector 40 is connected with condenser 37, the condensation water reclaimed by condenser 37 for storage, the residual air outlet of condenser 37 is connected with the import of air ejector 38, the outlet of air ejector 38 connects one end and one end of residual air bypass duct 42 of residual air pipeline 39 respectively, the other end of residual air bypass duct 42 connects desulfurizer 28, and the other end of residual air pipeline 39 connects First air mixing chamber 19.Remaining incondensable gas (hereinafter referred to as residual gas) after condenser 37 recycle-water steam, this residual gas enters First air mixing chamber 19 through residual air pipeline 39 and enters in burner hearth as First air, make the fuel gas that may contain in residual gas abundant after-flame in burner hearth, it addition, residual gas can also be in residual air bypass duct 42 enters 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.
Sequentially pass through smoke discharging pipe 26 between the outlet of stove inner flue, cleaner unit 25, air-introduced machine 27, desulfurizer 28 and chimney 29 to be connected.
One end of the feed pipe 61 of Steam Turbine 502 is connected with the feedwater outlet of Steam Turbine 502, the other end is connected with boiler host subsystem 402, one end of steam pipeline 62 is connected with boiler host subsystem 402, the other end is connected with the steam inlet of Steam Turbine 502, Steam Turbine 502 is connected by the import of extraction line 63 with exhaust steam extraction heater 33a, and Steam Turbine 502 is connected by the outlet of drain water piping 64 with exhaust steam extraction heater 33a, draw gas to be entered exhaust steam extraction heater 33a by extraction line 63 from what steam turbine 60 was extracted out exhaust steam is heated, drawing gas afterwards, formation is hydrophobic flows back into Steam Turbine 502 by drain water piping 64.
Fig. 4 is the flow chart of superheat steam drying powder process type coal generating system in the 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, raw coal 1 is milled into coal dust in coal pulverizer 7, export from coal pulverizer 7 after being entered the desiccant dryness of coal pulverizer 7 simultaneously, the mixture of exhaust steam and the coal dust of coal pulverizer 7 outlet i.e., vapour powder mixture when mill separator 8, coarse powder is separated and reenters in coal pulverizer 7 and again grinds.Vapour powder mixture through mill separator 8 enters coal collector 10 by powder process pipeline 9, exhaust steam in vapour powder mixture and coal dust are isolated by coal collector 10, coal dust is stored by Pulverized Coal Bin 11, coal dust in Pulverized Coal Bin 11 is sent into air and powder mixer 13 by machine supplying powder 12, mix with the First air from First air mixing chamber 19 in air and powder mixer 13, then by powder feeding pipes 22 be sent to coal burner 23 enter in burner hearth with secondary wind one combust 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, the air-supply of cold wind 2 i.e. boiler is sent into condenser 37 as cooling medium for condensing the exhaust steam in 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 is entered by warm air pipeline 55 and is thermally formed hot blast in air preheater 15 by flue gas further.The hot blast of air preheater 15 air side outlet directly draws toward coal burner 23 through secondary wind hot air duct 16 mostly as secondary wind.Another small part hot blast carries out being mixed to form First air with the warm air of warm air bypass duct 18 conveying in First air mixing chamber 19, the warm air of warm air bypass duct 18 conveying can regulate the temperature of First air, First air enters air and powder mixer 13 through First air pipeline 21 after by First air booster fan supercharging, and then is sent in burner hearth by coal dust and burn.
Flue gas flow (S5): coal dust and air generate flue gas at the stove chamber inner combustion of boiler 19, flue gas in burner hearth is discharged from stove inner flue, at stove inner flue afterbody, air preheater 15 and exhaust steam flue gas heater 33b are heated, the flue gas removing dust device 25 discharged enters air-introduced machine 27 by smoke discharging pipe 26 after purifying, enter afterwards in desulfurizer 28, through the flue gas 3 of desulfurizing and purifying by chimney 29 row to atmospheric environment.
Fig. 6 is the block diagram of powder process subsystem in the embodiment of the present invention.
As shown in Figure 6, water vapour flow process (S6-1, S6-2): be made up of the moisture evaporation of raw coal 1 water vapour in powder process subsystem 401.Export at coal pulverizer 7 and be referred to as exhaust steam between the air inlet of exhaust steam extraction heater 33a, between exhaust steam flue gas heater 33b gas outlet and coal pulverizer 7 entrance, be referred to as superheated steam.nullExhaust steam separates in coal collector 10 with coal dust，Isolated exhaust steam is extracted out by exhaust steam blower fan 31 and is divided into two parts，A part of exhaust steam is sent into exhaust steam extraction heater 33a and exhaust steam flue gas heater 33b by exhaust steam circulating line 32 and is carried out being thermally formed superheated steam，This superheated steam sends into coal pulverizer 7 as desiccant through superheat steam pipeline 34b，The raw coal 1 entering coal pulverizer 7 is dried，The vapour powder mixture of coal pulverizer 7 outlet is isolated coal dust by coal collector 10 and exhaust steam forms，The moisture that exhaust steam now is evaporated by superheated steam and the raw coal 1 as desiccant forms，Being partly into exhaust steam extraction heater 33a and exhaust steam flue gas heater 33b and circulating in powder process subsystem 401 as desiccant from the exhaust steam of coal collector 10 venthole discharge，Another part exhaust steam is sent into condenser 37 through exhaust steam output channel 36 and is reclaimed.Exhaust steam is cooled by coolant 80 in condenser 37, thus obtains and condense water in a large number, condenses water and combines in water collector 40.
The flow process (S5) of feedwater: water forms high-temperature high-pressure steam after feed pipe 61 is heated by boiler host subsystem 402, high-temperature high-pressure steam does work in steam pipeline 62 sends into Steam Turbine 502, and Steam Turbine 502 drives electromotor 70 to work.Heat regenerative system extraction section of drawing gas from Steam Turbine 502 is drawn gas, and this draws gas and heats the exhaust steam in exhaust steam extraction heater 33a, produces hot exhaust steam.It addition, the low-temperature condensate in Steam Turbine 502 is for cooling down the exhaust steam in condenser 37, then flow back in Steam Turbine 502.
The residual gas that exhaust steam apparatus for recovering is discharged after reclaiming water vapour is in residual air conveyer device is delivered to First air mixing chamber 19 respectively 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 and burn；When this residual gas does not contains fuel gas, open the valve on residual air bypass duct 42, make this residual gas discharge after gas cleaning subsystem 405.
In the present embodiment, first, control steam appendix 52 by control valve 51 and carry gas 50 to exhaust steam circulating line 32, as desiccant, the raw coal 1 in entrance coal pulverizer 7 and coal dust are dried after gas 50 is heated, then, after Preset Time, control valve 51 controls steam appendix 52 and stops carrying gas 50 to exhaust steam circulating line 32, and the valve 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 so that desiccant convergence is that either pure steam does not contains other miscellaneous QI, and so achieving either pure steam is that coal dust is dried by desiccant.
The effect of embodiment and effect
nullIn the superheat steam drying powder process type coal generating system of the present embodiment，Powder process subsystem is with superheated steam for powder process subsystem desiccant and coal pulverizer ventilation medium，The circulation exhaust steam warp that superheated steam is formed because of moisture in coal evaporation by coal pulverizer outlet carries out pre-warmed exhaust steam extraction heater and the exhaust steam flue gas heater heated further through flue gas again is thermally formed to draw gas in Steam Turbine for adding thermal medium，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，Another part output exhaust steam constantly evaporated in powder process subsystem because of moisture in coal and produce，Reclaimed by exhaust steam Water Sproading subsystem carries out condensation with the low-temperature condensate in Steam Turbine and cold wind together as cooling medium，The heat that heat in exhaust steam is simultaneously used for preheating in cold wind and exhaust steam is simultaneously used in Steam Turbine.
And, 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, the condensation heat drawn gas is made effectively to be used in the drying capacity of coal pulverizing system, namely the condensation used heat of steam in Steam Turbine is effectively utilized by steam generator system, the cold source energy of steam turbine thermodynamic cycle is greatly reduced.Exhaust steam forms hot exhaust steam after exhaust steam extraction heater preheats, hot exhaust steam is further formed the sufficiently high superheated steam of temperature by the flue gas of burner hearth, the drying capacity making powder process subsystem is effectively ensured, and generating set adaptation ability to coal-fired moisture change is greatly improved.
In datonation-inhibition inert gas flue gas, nitrogen and water vapour that industry is conventional, water vapour has optimal datonation-inhibition function.The desiccant that the present embodiment is powder process subsystem with superheated steam, whole powder process subsystem is made to run under complete inerting atmosphere, ensure 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, pulverizing process is not required to extra steam, nitrogen production system, also without consuming other medium such as flue gas, hot blast so that pulverizing process 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 poor being burst caused in a large number by coal grain in conventional furnace smoke drying and hot-air drying process, 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 waste heat and the Water Sproading of the almost powder process exhaust steam of either pure steam become 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, exhaust steam apparatus for recovering is realizing the recycling and reuse of the great lot of water resources that waste heat recovery is realized simultaneously, especially rich coal water-deficient area is had immeasurable environment protection significance.
The cold wind carried by boiler fan cools down exhaust steam as cooling medium in exhaust steam apparatus for recovering, cold wind is preheated formation warm air, warm air finally enters in boiler burns, the a large amount of latent heats of condensation making exhaust steam are effectively utilized by boiler, boiler thermal output thus can be greatly improved so that the boiler thermal output that coal-fired power station boiler calculates based on coal-fired low heat valve is possibly realized more than 100%.Owing to the condensation heat amount of exhaust steam is bigger, and the optimal warm air temperature needs that electricity generation system efficiency is the highest can be made to consider with exhaust gas temperature rising and determine, thus when ensureing only to be not sufficient enough to reclaim exhaust steam residual heat by boiler air-supply cooling on the premise of optimal warm air temperature, the present invention is further by cooling down exhaust steam as cooling medium from the low-temperature condensate in Steam Turbine in exhaust steam apparatus for recovering, low-temperature condensate returns Steam Turbine after being heated to uniform temperature thus reduces the low-pressure heater amount of drawing gas, so that the latent heat of condensation of exhaust steam is effectively utilized by Steam Turbine therrmodynamic system, thus improve power plants generating electricity efficiency further.By air-cooled and two kinds of waste heat recovery modes of water-cooled combination application, exhaust steam Water Sproading effect can be fully ensured that, and by air-cooled and water-cooled heat optimized distribution, the generating efficiency of electricity generation system can be made to reach the highest, and regulation during electricity generation system variable load operation can be made more flexible and convenient.Additionally, with existing by compared with the low-pressure coal saver of flue gas, in the present invention, volume and the cost of investment of water-cooled condenser all can be greatly reduced.
The present embodiment carries out vapour powder separation by coal collector to vapour powder mixture and obtains low moisture coal dust so that coal quantity significantly improves.This coal dust after drying and upgrading is sent into boiler by uniform temperature air and is burnt, and will not have the low combustion instability of in-furnace temperature, low NO againXThe problems such as burning tissues burning difficulty.Meanwhile, using 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 combustion stability and the efficiency of combustion that both improve breeze airflow, and the low NOx combustion tissue also making breeze airflow is convenient, thus realizes clean and effective and stably burn.And, this coal dust after drying and upgrading is sent into boiler combustion by the First air in powder feeding subsystem of blowing with uniform temperature, and the moisture from the raw coal that powder process subsystem evaporates no longer enters boiler with powder feeding medium, boiler exhaust gas amount is reduced in a large number, corresponding exhaust gas temperature also can reduce, finally making boiler exhaust gas heat loss be greatly reduced, boiler thermal output significantly improves.
In the present embodiment, burn because the fuel gas that may contain in water vapour is sent back in boiler by residual air conveyer device, thus 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, solve the problem that high-moisture coal-fired boiler combustion is unstable, overcome the tradition inefficient shortcoming of high-moisture coal-fired boiler hot, make powder process subsystem run under inerting atmosphere while boiler thermal output is greatly improved thus improve the safety in operation of high volatile coal powder process subsystem, the most prominent is, waste heat and the Water Sproading easily Project Realization of moisture in coal is made using superheated steam as desiccant, simultaneously improve coal generating system efficiency further also by steam condensation pick up the heat of diving, thus superheat steam drying powder process type coal generating system of the present invention has energy-saving benefit and the environment protection significance of highly significant.
Superheat steam drying powder process type coal generating system the most involved in the present invention is not merely defined in structure in the above-described embodiments.Above content is only the basic explanation under present inventive concept, and according to any equivalent transformation that technical scheme is made, all should belong to protection scope of the present invention.
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 in the inerting gases such as water vapour, nitrogen, flue gas any one.
When raw coal moisture is higher, the predrying pipe of raw coal can also be set between coal pulverizer and feeder, the import of the predrying pipe of raw coal is communicated on superheat steam pipeline by steam pipeline, part superheated steam is transported to directly contact with raw coal in the predrying pipe of raw coal by steam pipeline, thus raw coal is carried out predrying, achieved by superheated steam and raw coal is dried safely.
Predry drying prescription in the predrying pipe of raw coal is possible not only to the part superheated steam being to be carried by steam pipeline, can also be that the entrance point of superheat steam pipeline directly pipe predrying with raw coal is connected, superheated steam through raw coal predrying pipe raw coal is carried out predrying after enter coal pulverizer vapour powder mixture be further dried.
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 cold wind
Described exhaust steam Water Sproading subsystem comprises: being connected with described Steam Turbine and being connected with described pressure fan utilizes the low-temperature condensate of described Steam Turbine and described cold wind that a part for described exhaust steam carries out the exhaust steam apparatus for recovering that condensation is reclaimed,
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: be connected the exhaust steam pipeline for carrying described exhaust steam with described coal collector, connection is used for carrying the exhaust steam circulating line of another part of described exhaust steam on described exhaust steam pipeline, it is connected with described exhaust steam circulating line and the described exhaust steam in described exhaust steam circulating line is preheated the exhaust steam extraction heater forming hot exhaust steam, it is connected with described exhaust steam extraction heater and forms the exhaust steam flue gas heater of the superheated steam as desiccant for described hot exhaust steam being heated further, and described desiccant is delivered in described vapour powder generation drying device the superheat steam pipeline being circulated,
Described exhaust steam extraction heater utilizes the condensation heat drawn gas of described steam turbine that described exhaust steam is thermally formed described hot exhaust steam,
Described exhaust steam flue gas heater utilizes the flue gas of described burner hearth that described hot exhaust steam 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,
The described cold wind condensation that exhaust steam in described exhaust steam apparatus for recovering is provided by described low-temperature condensate and the described pressure fan of described Steam Turbine becomes condensation water, and 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, a part for described hot blast enters in described air and powder mixer as described First air with another part of described warm air 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 described 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 utilizes described low-temperature condensate and described cold wind described exhaust steam to be condensed into condense the condenser of water, store and reclaim the water collector of described condensation water and be connected with described exhaust steam output channel described exhaust steam is introduced directly into the exhaust steam bypass duct of described desulfurizer
Described condenser comprises the cold water inlet being connected with described Steam Turbine and the cold water outlet pipe being connected with described Steam Turbine,
Described exhaust steam is condensed in described cold water inlet flows into described condenser by described low-temperature condensate, and described low-temperature condensate flows back in described Steam Turbine through described cold water outlet pipe after being heated by described exhaust steam.
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 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 and 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 according to claim 1, it is characterised in that:
Wherein, described exhaust steam extraction 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 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410640227.2A CN104373950B (en) | 2014-11-13 | 2014-11-13 | Superheat steam drying powder process type coal generating system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410640227.2A CN104373950B (en) | 2014-11-13 | 2014-11-13 | Superheat steam drying powder process type coal generating system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104373950A CN104373950A (en) | 2015-02-25 |
| CN104373950B true CN104373950B (en) | 2016-09-14 |
Family
ID=52553023
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410640227.2A Expired - Fee Related CN104373950B (en) | 2014-11-13 | 2014-11-13 | Superheat steam drying powder process type coal generating system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104373950B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4431156A1 (en) * | 1994-09-02 | 1996-03-07 | Steinmueller Gmbh L & C | Exhaust gas heat recovery process for coal=fired steam generator |
| DE19742857C1 (en) * | 1997-09-29 | 1998-12-10 | Evt Energie & Verfahrenstech | Steam generator burner for brown coal |
| CN102155744A (en) * | 2010-12-22 | 2011-08-17 | 上海锅炉厂有限公司 | System for pre-drying coal with high water content by utilizing residual heat of boiler gas |
| CN102798133A (en) * | 2011-05-27 | 2012-11-28 | 中国电力工程顾问集团东北电力设计院 | Fan grinding hot blast powder feeding and pulverizing system utilizing flue gas drying and water recycling |
| CN203147790U (en) * | 2013-03-18 | 2013-08-21 | 施大钟 | Exhaust air fluidized brown coal medium speed mill straight-blowing coal pulverizing system |
| CN104132359A (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 |
| CN204240391U (en) * | 2014-11-13 | 2015-04-01 | 上海理工大学 | Superheat steam drying powder process type coal generating system |
-
2014
- 2014-11-13 CN CN201410640227.2A patent/CN104373950B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4431156A1 (en) * | 1994-09-02 | 1996-03-07 | Steinmueller Gmbh L & C | Exhaust gas heat recovery process for coal=fired steam generator |
| DE19742857C1 (en) * | 1997-09-29 | 1998-12-10 | Evt Energie & Verfahrenstech | Steam generator burner for brown coal |
| CN102155744A (en) * | 2010-12-22 | 2011-08-17 | 上海锅炉厂有限公司 | System for pre-drying coal with high water content by utilizing residual heat of boiler gas |
| CN102798133A (en) * | 2011-05-27 | 2012-11-28 | 中国电力工程顾问集团东北电力设计院 | Fan grinding hot blast powder feeding and pulverizing system utilizing flue gas drying and water recycling |
| CN203147790U (en) * | 2013-03-18 | 2013-08-21 | 施大钟 | Exhaust air fluidized brown coal medium speed mill straight-blowing coal pulverizing system |
| CN104132359A (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 |
| CN204240391U (en) * | 2014-11-13 | 2015-04-01 | 上海理工大学 | Superheat steam drying powder process type coal generating system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104373950A (en) | 2015-02-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN204240348U (en) | Superheat steam drying powder process type coal-burning boiler unit and electricity generation system | |
| CN204240347U (en) | Superheat steam drying powder process type coal generating system | |
| CN104359107B (en) | Superheat steam drying powder process type coal-burning boiler unit | |
| CN104329667B (en) | Superheat steam drying powder process type coal generating system | |
| CN204240384U (en) | Superheat steam drying powder process type coal generating system | |
| CN204240391U (en) | Superheat steam drying powder process type coal generating system | |
| CN204240386U (en) | Superheat steam drying powder process type coal generating system | |
| CN104329666B (en) | Superheat steam drying powder process type coal generating system | |
| CN104132361A (en) | Open powder making steam warm air type boiler unit and power generation system thereof | |
| CN204114984U (en) | With the stove cigarette dry enclosed powder process coal-burning boiler unit that weary air water reclaims | |
| CN204240390U (en) | Superheat steam drying powder process type coal generating system | |
| CN204240382U (en) | Superheat steam drying powder process type coal generating system | |
| CN204240385U (en) | Superheat steam drying powder process type coal generating system | |
| CN204240389U (en) | Superheat steam drying powder process type coal generating system | |
| CN204739580U (en) | Superheated steam drying powder process type coal fired boiler unit and power generation system | |
| CN104315509B (en) | Superheat steam drying powder process type coal-burning boiler unit | |
| CN104373948B (en) | Superheat steam drying powder process type coal generating system | |
| CN104373950B (en) | Superheat steam drying powder process type coal generating system | |
| CN104329668B (en) | Superheat steam drying powder process type coal generating system | |
| CN204240387U (en) | Superheat steam drying pulverized coal preparation system, coal-burning boiler unit and electricity generation system | |
| CN104132360A (en) | Open powder making steam warm air type boiler unit and power generation system thereof | |
| CN204240383U (en) | Superheat steam drying powder process type coal generating system | |
| CN104165373B (en) | The open weary gas heating type boiler controller system of powder process | |
| CN204114982U (en) | With the weary air dry enclosed powder process coal-burning boiler unit of stove cigarette heat that weary air water reclaims | |
| CN204240388U (en) | Superheat steam drying powder process type coal generating system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160914 Termination date: 20181113 |