CN104132362A - Open powder making steam warm air type boiler unit and power generation system thereof - Google Patents
Open powder making steam warm air type boiler unit and power generation system thereof Download PDFInfo
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- CN104132362A CN104132362A CN201410371251.0A CN201410371251A CN104132362A CN 104132362 A CN104132362 A CN 104132362A CN 201410371251 A CN201410371251 A CN 201410371251A CN 104132362 A CN104132362 A CN 104132362A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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Abstract
The invention provides an open powder making steam warm air type boiler unit used for burning raw coal and being connected with a turbine unit with a turbine. The open powder making steam warm air type boiler unit is characterized in that an air exhaust preheater further heats warm air to obtain hot air, one part of the hot air and environment cold air are mixed to be used as primary air, an air and powder mixer mixes the primary air and coal powder to obtain air and powder mixtures, the other part of the hot air is used as secondary air to be directly fed in a coal powder burner, an exhaust water recycling device leads one part of exhaust and recycles water in the exhaust, the air exhaust preheater is connected with the exhaust water recycling device, cold exhaust with the water recycled is heated to form hot exhaust, a drying agent mixing chamber is connected with a smoke extraction opening and a gas outlet of a coal powder collector, and the other part of the exhaust, part of smoke extracted out of the smoke extraction opening and the hot exhaust are mixed and used as drying agents to be fed in a raw coal pre-drying device.
Description
Technical field
The present invention relates to a kind of open type powder process steam heating type boiler unit and electricity generation system thereof of coal fired power plant, be specifically related to boiler air-supply, cold wind preheating, powder process, coal dust firing and flue gas water reclamation technology.
Background technology
Brown coal have that moisture is high, volatile matter is high, caloric value is low, ash fusion point is low, abrasiveness is low and the feature such as easy spontaneous combustion.At worldwide brown coal, account for world's coal gross reserves 40%.China's brown coal account for domestic coal gross reserves 16%, are mainly distributed in area and Yunnan Province that east Inner Mongolia and three provinces in the northeast of China have a common boundary.The brown coal of the Inner Mongol and the Northeast belong to old brown coal, total moisture 25～40%; Yunnan lignite belongs to young brown coal, and total moisture 40～60%, containing wood fibre.In addition, the coal prognostic reserves that are positioned at Xinjiang of China In The Eastern Junggar Basin " accurate eastern coalfield " reach 3,900 hundred million tons, are the self-contained coalfields of China's maximum.Accurate eastern coal is except caloric value is compared with brown coal height, and other coal characteristic is similar to brown coal, also has that moisture is high, volatile matter is high, ash fusion point is low, abrasiveness is low and the feature of easy spontaneous combustion.
For improving brown coal, utilize level, carried out the brown coal drying technical research of various ways both at home and abroad.With the predrying technology of drawing gas that thermal power plant is integrated, steam condensation used heat is predrying for brown coal, can improve in theory 2～4 percentage points of power plant efficiencies, but no matter steam pipe roller drier or in heating steam fluidized-bed process, it between coal grain and steam, is the wall-type heat exchange that heat transfer intensity is lower, therefore drying equipment is bulky, equipment investment and operating cost are very large.Flue gas (or hot-air) dry technology can adopt the forms such as fluid bed, moving bed and gas flow tube, between coal grain and flue gas (or hot-air), it is the mixing heat-exchange that heat transfer intensity is higher, but the dry safety in operation of flue gas (or hot-air) is poor, drying system easily catches fire, and needs strict desiccant temperature and the oxygen content controlled.Mechanical/thermal press-dehydrating and heating power dehydration are non-evaporation drying technology, thereby to be energy consumption for drying low and can remove a part of alkali metal material improves boiler scaling and contamination for advantage, but dehydration conditions is HTHP, and equipment enlarging is more difficult, and the intractability of dewatering system waste discharge is larger.Due to easily cracked easy spontaneous combustion of brown coal, the moulding of dry rear brown coal and safe storage transportation are also comparatively difficult.Visible, all there is distinctive difficulty in current all kinds of brown coal drying technology, still needs further research with perfect before scale application.
In existing power plant thermal system, the used heat that condenses in a large number of Steam Turbine steam discharge distributes but and cannot be utilized, and does not also exist under the prerequisite that keeps air preheater cold-end air metal temperature and utilizes the used heat that condenses of Steam Turbine low pressure steam to prepare such technical scheme for pulverized coal preparation system drier.
Brown coal moisture is high, calorific value is low and easy spontaneous combustion, therefore unsuitable long distance transportation.The main path that brown coal utilize is at present still by electric power stations near coal-mines combustion power generation, then transmits electric power to the area of needs.And the installed capacity of Chinese large-sized combustion brown coal generating sets (single-machine capacity >=200MW) only accounts for 3% left and right of national thermoelectricity total installation of generating capacity, far below brown coal shared ratio (16%) in coal gross reserves.So along with the ratio of High Quality Tobacco coal reserves constantly declines, development brown coal unit is significant to China's Sustainable Development of Power Industry.
At present existing many 600MW level brown coal units of China put into operation, and all configure unit pulverized-coal system boiler.But compare with conventional bituminous coal fired boiler, the thermal efficiency lower (approximately low 2 percentage points) and the price of these boiler using brown coals are higher, this is main because the inner flue gas of the stove amount in boiler using brown coal is larger, thereby boiler exhaust gas heat loss is higher, and boiler volume is also larger.In addition, the unit pulverized-coal system of high-moisture fire coal needs extracting high-temperature stove cigarette as pulverized coal preparation system drier key component, and this makes to contain the inert gases such as a large amount of stove cigarettes and steam in a wind, causes Boiler Stable Combustion also comparatively difficult.
In addition, thermal power plant is water for industrial use rich and influential family, and China's brown coal producing region (for example Eastern Inner Mongolia) belongs to areas of serious mostly, and water resources shortage becomes the important restriction factor of the near coal-mine power supply construction of base of impact.Obviously, in the flue gas of high-moisture coal-burning boiler, contain and have great lot of water resources, realizing the recycling of moisture in coal-fired flue-gas becomes a problem demanding prompt solution.
Summary of the invention
In order to address the above problem, carry out, the object of the present invention is to provide a kind of can not only realization to recycle a large amount of weary air water in milling waste steam processed, can also realize high efficiency generating, and open type powder process steam heating type boiler unit and the electricity generation system thereof of security of operation.
The present invention, in order to address the above problem, has adopted following structure:
< structure one >
The invention provides a kind of open type powder process steam heating type boiler unit, for raw coal is burnt and is connected with the Steam Turbine that contains steam turbine, it is characterized in that, comprise: powder process subsystem, boiler body subsystem, air-supply powder feeding subsystem and weary air water reclaim subsystem, wherein, powder process subsystem comprises: the raw coal pre-drying device connecting in turn, gas powder generating apparatus, coal collector, Pulverized Coal Bin, machine supplying powder and the drier mixing chamber being connected with raw coal pre-drying device, boiler body subsystem comprises: burner hearth, the flue being connected with the afterbody of burner hearth, near the flue gas that is positioned at the coal burner of burner hearth entry position and is positioned at the exhanst gas outlet of burner hearth is taken out mouth, air-supply powder feeding subsystem comprises: air and powder mixer, the wind mixing chamber being connected with air and powder mixer, be positioned at flue afterbody, the cold wind preheating device being connected with the weary air preheater of air and for the pressure fan of environment cold wind is provided, weary air water reclaims subsystem and comprises: the weary air water retracting device being connected with the gas vent of coal collector, the drier that raw coal pre-drying device is used to self-desiccation agent mixing chamber carries out predrying to raw coal, gas powder generating apparatus obtains primary mixture after dried raw coal being ground and being further dried, coal collector carries out separation to primary mixture and obtains coal dust and weary gas, Pulverized Coal Bin stores coal dust, machine supplying powder is for measuring and regulate the boiler coal feeding amount that flows to air and powder mixer of controlling, air and powder mixer is mixed to get wind powder mixture to wind from air-supply powder feeding subsystem and coal dust, coal burner burns to the coal dust in wind powder mixture, coal dust generates flue gas in the internal-combustion of burner hearth, the low-pressure steam that cold wind preheating device utilizes the extraction opening of steam turbine to extract out preheats and obtains warm braw a part for environment cold wind, the weary air preheater of air further heats and obtains hot blast warm braw, another part of a part for hot blast and environment cold wind after a wind mixing chamber mixes as a wind, another part of hot blast is directly sent into coal burner as Secondary Air, air and powder mixer is mixed to get wind powder mixture by wind and coal dust, the moisture that weary air water retracting device is introduced the weary gas of the first in weary gas in the weary gas of Bing Jianggai first reclaims, the weary air preheater of air is connected with weary air water retracting device, the cold weary gas carrying out after moisture recovery is heated to the hot weary gas of rear formation, drier mixing chamber is taken out mouth with flue gas respectively and is connected with the gas vent of coal collector, by the weary gas of the second portion in weary gas, from flue gas, take out mouthful the part of the flue gas extracting and hot weary gas mix and send into raw coal pre-drying device as drier.
In open type powder process steam heating type boiler unit provided by the invention, can also there is such feature: wherein, weary air water retracting device comprises: is connected with the gas vent of coal collector, and the blast pipe road that weary gas is carried, the weary air water recover being connected with blast pipe road and the collecting-tank that stores weary air water.
In open type powder process steam heating type boiler unit provided by the invention, can also there is such feature: wherein, cold wind preheating device has: utilize steam air heater that low-pressure steam heats environment cold wind and for the environment cold wind after heating being introduced to the warm braw pipeline of the weary air preheater of air.
In open type powder process steam heating type boiler unit provided by the invention, can also there is such feature: wherein, powder process subsystem also comprises that one end is connected with the weary gas outlet of coal collector, air quantity that the other end is connected with the import of gas powder generating apparatus regulates pipeline, enters gas powder generating apparatus supplement the air quantity that adjusting enters gas powder generating apparatus for the weary pneumatic transmission of third part of weary gas that weary gas outlet is sent.
In addition, the present invention also provides a kind of electricity generation system, there is such feature: open type powder process steam heating type boiler unit and the Steam Turbine that contains steam turbine, wherein, open type powder process steam heating type boiler unit and Steam Turbine are open type powder process steam heating type boiler unit and the Steam Turbine in above-mentioned any one.
< structure two >
The present invention also provides a kind of open type powder process steam heating type boiler unit, for raw coal is burnt and is connected with the Steam Turbine that contains steam turbine, it is characterized in that, comprise: powder process subsystem, boiler body subsystem, air-supply powder feeding subsystem and weary air water reclaim subsystem, wherein, powder process subsystem comprises: the raw coal pre-drying device connecting in turn, gas powder generating apparatus, coal collector, Pulverized Coal Bin, machine supplying powder and the drier mixing chamber being connected with raw coal pre-drying device, boiler body subsystem comprises: burner hearth, flue, near the flue gas that is positioned at the coal burner of burner hearth entry position and is positioned at the exhanst gas outlet of burner hearth is taken out mouth, air-supply powder feeding subsystem comprises: the first cold wind preheating device, be positioned at three minutes weary air preheaters of storehouse swinging air of flue afterbody and the second cold wind preheating device being connected with the weary air preheater of air, weary air water reclaims subsystem and comprises: the weary air water retracting device being connected with the gas vent of coal collector, the drier that raw coal pre-drying device is used to self-desiccation agent mixing chamber carries out predrying to raw coal, gas powder generating apparatus obtains primary mixture after dried raw coal being ground and being further dried, coal collector carries out separation to primary mixture and obtains coal dust and weary gas, Pulverized Coal Bin stores coal dust, machine supplying powder is for measuring and regulate the boiler coal feeding amount that flows to air and powder mixer of controlling, air and powder mixer is mixed to get wind powder mixture to wind from air-supply powder feeding subsystem and coal dust, coal burner burns to the coal dust in wind powder mixture, coal dust generates flue gas at stove chamber inner combustion, the low-pressure steam that the first cold wind preheating device utilizes the extraction opening of steam turbine to extract out heats the hot blast of first environment cold wind generation as a wind, the low-pressure steam heating second environment cold wind that the second cold wind preheating device utilizes the extraction opening of steam turbine to extract out, enter afterwards the weary air preheater of the air hot blast that further heating generates as Secondary Air, air and powder mixer is mixed to get wind powder mixture by wind and coal dust, Secondary Air directly enters coal burner, the weary gas of weary air water retracting device Jiang Faqizhong first is introduced and the moisture in weary gas is reclaimed, the weary air preheater of air is connected with weary air water retracting device, the cold weary gas carrying out after moisture recovery is heated to the hot weary gas of rear formation, drier mixing chamber is also taken out mouth with flue gas respectively and is connected with the gas vent of coal collector, by the weary gas of the second portion in weary gas, from flue gas, take out mouthful the part of the flue gas of extracting out and hot weary gas mix and send into raw coal pre-drying device as drier.In open type powder process steam heating type boiler unit provided by the invention, can also there is such feature: wherein, weary air water retracting device comprises: is connected with the gas vent of coal collector, and the blast pipe road that weary gas is carried, the weary air water recover being connected with blast pipe road and the collecting-tank that stores weary air water.
In open type powder process steam heating type boiler unit provided by the invention, can also there is such feature: wherein, the first cold wind preheating device has: the wind steam air heater that utilizes that low-pressure steam heats first environment cold wind and the warm braw pipeline of wind being introduced to air and powder mixer, the second cold wind preheating device has: utilize the Secondary Air steam air heater that low-pressure steam heats second environment cold wind and the Secondary Air warm braw pipeline of Secondary Air being introduced to the weary air preheater of air.
In open type powder process steam heating type boiler unit provided by the invention, can also there is such feature: wherein, powder process subsystem also comprises that one end is connected with the weary gas outlet of coal collector, the air quantity that the other end is connected with the import of gas powder generating apparatus regulates pipeline, enters gas powder generating apparatus supplement the air quantity that adjusting enters gas powder generating apparatus for the weary pneumatic transmission that a part is sent from weary gas outlet.
In addition, the present invention also provides a kind of electricity generation system, there is such feature: open type powder process steam heating type boiler unit and the Steam Turbine that contains steam turbine, wherein, open type powder process steam heating type boiler unit and Steam Turbine are open type powder process steam heating type boiler unit and the Steam Turbine in any one in said structure two.
Effect and the effect of invention
In open type powder process steam heating type boiler unit of the present invention and electricity generation system thereof, because coal collector make coal dust and weary gas separated at coal collector, and in weary gas, be enriched with in the weary gas of a large amount of steam steam volume share much larger than steam volume share in flue gas, steam volume share is high is that water dew point is high, so greatly improved by weary gas lowered temperature reclamation condensate water the exploitativeness that in flue gas, moisture reclaims.And, in the present invention, using near extract furnace outlet high temperature flue gas, recycle weary gas and hot weary gas and mix after formed mixture as powder process subsystem drier, can further improve weary gas water capacity and water dew point, the moisture in weary gas can be recycled more economically effectively.And, using high temperature flue gas, recycle weary gas and after the weary air preheater heating of three minutes storehouse swinging air the mixture of the weary gas of heat of gained as powder process subsystem drier, make the oxygen content of drier compare obviously and reduce with conventional dry drying prescription, thereby obviously reduced the risk of coal combustion explosion in flour mill flow, and the flow that can recycle weary gas by adjusting regulates desiccant temperature easily, thereby guarantee that coal pulverizer outlet temperature is within suitable scope.In addition, in drier, adopt hot weary gas can make drier oxygen-content reduction, thereby pulverized coal preparation system is moved under inerting atmosphere, improve the safety in operation of high volatile coal pulverized coal preparation system.In addition, the cold weary gas that weary air water recovery system is discharged is introduced mixing chamber after three minutes storehouse swinging air/weary air preheaters are heated into hot weary gas again, both reached thus the object of utilizing inertia flue gas, also the flue gas of having avoided the gas recirculating fan extraction burner hearth that dependability is lower, makes the engineering feasibility of system better.In addition, a part for the hot blast after the weary air preheater heating of air is temperature required to safe powder feeding with environment cold wind mixing temperature adjustment, and the Modulatory character of the temperature of this wind effectively reduces the combustion explosion risk in powder feeding process.
And the weary gas forming in powder process subsystem does not enter burner hearth, exhaust gas volumn in burner hearth is reduced, correspondingly in burner hearth, flame temperature raises.In addition, adopt pulverized coal carried by hot air that inert gas content in a wind is significantly reduced, breeze airflow ignition heat reduces thus, and in a wind, oxygen concentration improves.Coefficient result is both to have improved combustion stability and the efficiency of combustion of breeze airflow, also makes the low NOx combustion of breeze airflow organize convenient, thereby realizes clean and effective smooth combustion.
And, because the moisture in coal evaporating near the sub-fraction flue gas extracting furnace outlet and powder process subsystem no longer enters burner hearth, the exhaust gas volumn of back-end ductwork and the weary air preheater of air of making to flow through obviously reduces, on the other hand, although adopt pulverized coal carried by hot air make the to flow through air quantity of the weary air preheater of air to be tending towards reducing, but newly-increased one weary air-flow absorbs heat through air preheater simultaneously, the cold rate-of flow of air preheater of making to flow through obviously increases, thereby be conducive to improve heat transfer temperature difference, reduces preheater heat exchange area.Thereby synthesis result is that cigarette/geomantic omen equivalent proportion of the weary air preheater of air obviously reduces, be also that the weary air preheater outlet of air exhaust gas temperature can significantly reduce.For avoiding volatile matter in coal to separate out, also adopted lower coal pulverizer outlet temperature in pulverizing process, also lower coal collector exports weary temperature degree simultaneously.Owing to forming the weary air preheater outlet flue gas of air of open type powder process steam heating type boiler unit smoke evacuation and coal collector, to export the equal temperature of weary gas lower, compares with existing boiler unit, and correspondingly boiler thermal output obviously improves.
And, because be provided with the low-pressure steam utilizing from Steam Turbine before the air-supply entrance of the weary air preheater of air, environment cold wind is carried out to the cold wind preheating device of preheating, make the wind that enters the weary air preheater of air first in cold wind preheating device, obtain preheating to a certain extent, when improving boiler thermal output thus, guarantee that cold end corrosion does not occur the weary air preheater cold side metal of air heating surface, thereby guarantee the weary air preheater safe operation of air.Simultaneously, utilize the used heat that condenses of the low-pressure steam of Steam Turbine to come preheating environment cold wind to blow as boiler, thereby these condense, used heat is recycled by open type powder process steam heating type boiler unit, and from Thermal System of Fossil Fuel-Fired Power Station, this has further improved the generating efficiency of power plant.And, when reducing due to exhaust gas volumn in air preheater, cold rate-of flow obviously increases because increasing one weary gas newly, make the exhaust gas temperature can be very low, therefore boiler air-supply need be preheated to higher warm braw temperature, to keep air preheater cold-end air metal temperature can make 70～85 ℃ of scopes that corrosion rate is lower, the used heat that condenses that this means more extracted steam from turbines is effectively back to power plant thermal system, and power plant efficiency is further improved.
Therefore, the present invention can provide a kind of not only realization the moisture in weary gas to be reclaimed and recycled can also to realize generating efficiency higher, and open type powder process steam heating type boiler unit and the electricity generation system thereof of security of operation.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of electricity generation system in the embodiment of the present invention one;
Fig. 2 is the structured flowchart of the embodiment of the present invention one middle open type powder process steam heating type boiler unit;
Fig. 3 is the construction module schematic diagram of the embodiment of the present invention one middle open type powder process steam heating type boiler unit;
Fig. 4 is the block diagram of powder feeding subsystem of blowing in the embodiment of the present invention one;
Fig. 5 is the structural representation of the embodiment of the present invention one middle open type powder process steam heating type boiler unit;
Fig. 6 is the construction module schematic diagram of the embodiment of the present invention two middle open type powder process steam heating type boiler units; And
Fig. 7 is the structural representation of the embodiment of the present invention two middle open type powder process steam heating type boiler units.
The specific embodiment
For technological means, creation characteristic that the present invention is realized, reach object and effect is easy to understand, following examples are described in detail the present invention relates to open type powder process steam heating type boiler unit and electricity generation system thereof in conjunction with the accompanying drawings and embodiments.
< embodiment mono->
Fig. 1 is the structured flowchart of electricity generation system in the embodiment of the present invention one.
As shown in Figure 1, electricity generation system 100 comprises: open type powder process steam heating type boiler unit 501, Steam Turbine 502 and generating set 503.
The heat heating water that raw coal produces in 501 burnings of open type powder process steam heating type boiler unit forms high temperature and high pressure steam and enters Steam Turbine 502 actings, and then drives generating set 503 to generate electricity.
Fig. 2 is the structured flowchart of the embodiment of the present invention one middle open type powder process steam heating type boiler unit.
As shown in Figure 2, open type powder process steam heating type boiler unit 501 comprises: powder process subsystem 401, boiler body subsystem 402, air-supply powder feeding subsystem 403, weary air water reclaim subsystem 404 and gas cleaning subsystem 405.
403 pairs of environment cold wind of air-supply powder feeding subsystem 61 form a wind after processing, after mixing by a certain percentage, the coal dust that 401 pairs of raw coal 60 of a wind and powder process subsystem grind formation sends in boiler body subsystem 402, the Secondary Air of air-supply powder feeding subsystem 403 directly enters boiler body subsystem 402, part high-temperature flue gas in boiler body subsystem 402 is drawn out of one of them component of drier as powder process subsystem 401, after weary gas in boiler powder process subsystem 401 is separated, it is cooling that most of wet weary gas enters weary air water recovery subsystem 404, most of moisture in weary gas is condensed into after aqueous water and is recovered and recycles, a dry weary gas part after weary air water reclaims enters gas cleaning subsystem 405 after mixing with the smoke evacuation of boiler body subsystem 402 and purifies, what in Fig. 2, do not show is, the cold dry weary gas of part that is reclaimed the rear gained of subsystem 404 recovery by weary air water forms hot weary gas after air-supply powder feeding subsystem 403 is heated, the weary pneumatic transmission of this heat enters in powder process subsystem 401 as one of them component of drier.
Fig. 3 is the construction module schematic diagram of the embodiment of the present invention one middle open type powder process steam heating type boiler unit.
As shown in Figure 3, powder process subsystem 401 comprises: run coal bin 1, feeder 2, raw coal pre-drying device 3, blower mill 4, mill separator 5, powder process pipeline 6, coal collector 7, Pulverized Coal Bin 8, machine supplying powder 9, recirculation blast pipe road 23, air quantity regulate pipeline 51, drier mixing chamber 20, drier pipeline 21.Here, blower mill 4, mill separator 5 and powder process pipeline 6 have formed gas powder generating apparatus.
Air quantity regulates pipeline 51 one end to be connected with the weary gas outlet of coal collector 7, the air quantity that the other end is connected with the import of gas powder generating apparatus regulates pipeline, enters gas powder generating apparatus supplement the air quantity that adjusting enters gas powder generating apparatus for the weary pneumatic transmission that a part is sent from weary gas outlet.
Boiler body subsystem 402 comprises: coal burner 12, boiler 13 and flue gas are taken out mouth 19.
Air-supply powder feeding subsystem 403 comprises: pressure fan 29, air supply duct 30, steam air heater 31, air-supply bypass duct 32, warm braw pipeline 33, the weary air preheater 34 of air, first cooling by wind wind pipeline 35, wind-heat wind pipeline 36, Secondary Air hot air duct 37, secondary air bellow 38, wind mixing chamber 39, warm air pipeline 40, booster fan 41, wind bellows 42, air and powder mixer 10 and a powder feeding pipes 11.Here, pressure fan 29, air supply duct 30, steam air heater 31, warm braw pipeline 33, Secondary Air hot air duct 37, secondary air bellow 38 and air-supply bypass duct 32 have formed cold wind preheating device.
Weary air water reclaims subsystem 404 and comprises: weary gas blower fan 22, blast pipe road 24, weary air water retracting device 25, weary gas bypass duct 26, collecting-tank 27 and cold blast pipe road 28, be connected to the cold weary gas air-introduced machine 49 between cold blast pipe road 28 and the weary air preheater 34 of air and be connected to the hot blast pipe road 50 between the weary air preheater 34 of air and drier mixing chamber 20.
Gas cleaning subsystem 405 comprises: deduster 14, air-introduced machine 15, boiler exhaust gas pipeline 16, flue gas desulfur device 17 and chimney 18.
The annexation of open type powder process steam heating type boiler unit 501 integral body:
Run coal bin 1, feeder 2, raw coal pre-drying device 3, blower mill 4, mill separator 5, powder process pipeline 6 and coal collector 7 connect in turn, drier mixing chamber 20 respectively with raw coal pre-drying device 3, recirculation blast pipe road 23 and flue gas are taken out mouth 19, hot blast pipe road 50 is connected, coal collector 7 is also connected with the import of Pulverized Coal Bin 8 with weary gas blower fan 22 respectively, the outlet of Pulverized Coal Bin 8 is connected with machine supplying powder 9, machine supplying powder 9 is connected with the import of air and powder mixer 10, the outlet of air and powder mixer 10 is connected with one end of powder feeding pipes 11, the other end of powder feeding pipes 11 is connected with coal burner 12, flue gas is taken out mouth 19 and is connected with drier mixing chamber 20.The weary air preheater 34 of air is positioned at the afterbody of the flue of boiler 13.
Boiler fan 29 outlets are connected with the cold wind import of steam air heater 31 and the cold wind import of a wind blender 39 respectively, the hot blast import of steam air heater 31 is connected with the extraction opening of the output low-pressure steam 70 of Steam Turbine 502, it is hydrophobic 71 that low-pressure steam 70 produces after the interior heat release of steam air heater 31, and steam air heater 31 is connected with the condensate system (not shown in FIG.) of Steam Turbine 502 for discharging hydrophobic 71 delivery port.The other cold wind preheating device by-pass line 32 that arranges of steam air heater 31, the outlet of steam air heater 31 is connected with the air side import of the weary air preheater 34 of air, the air side outlet of the weary air preheater 34 of air is connected with the hot blast import of secondary air bellow 38 imports and a wind blender 39 with a wind-heat wind pipeline 36 by Secondary Air hot air duct 37 respectively, the outlet of secondary air bellow 38 is connected with coal burner 12, the outlet of a wind mixing chamber 39 is connected with wind booster fan 41 imports by warm air pipeline 40, wind booster fan 41 outlets are connected with the import of wind bellows 42, the outlet of wind bellows 42 is connected with the import of air and powder mixer 10.
The import of weary gas blower fan 22 is connected with the gas vent of coal collector 7, the outlet of weary gas blower fan 22 respectively with blast pipe road 24, coal pulverizer air quantity regulates pipeline 51 and recirculation blast pipe road 23 to be connected, recirculation blast pipe road 23 is connected with drier blender 20, weary air water retracting device 25 is connected with blast pipe road 24, weary air water retracting device 25 has cooling medium entrance 80 and cooling medium outlet 81, weary gas bypass duct 26 is in parallel with weary air water retracting device 25, collecting-tank 27 is connected with weary air water retracting device 25, moisture in the weary gas that storage is reclaimed by weary air water retracting device 25, a part for cold weary gas after the moisture reclaiming in weary gas through weary air water retracting device 25 is discharged to boiler exhaust gas pipeline 16 through cold blast pipe road 28.In addition, another part of cold weary gas after the moisture reclaiming in weary gas through weary air water retracting device 25 is under the guiding of cold weary gas air-introduced machine 49, by hot blast pipe road 50, after the weary air preheater 34 of air heats, form hot weary gas, finally enter drier mixing chamber 20.
Deduster 14 imports are connected with the fume side outlet of the weary air preheater 34 of air, deduster 14 outlets are connected with air-introduced machine 15 imports, air-introduced machine 15 outlets are connected with flue gas desulfur device 17 imports by boiler exhaust gas pipeline 16, and flue gas desulfur device 17 outlets are connected with chimney 18.
Fig. 4 is the block diagram of powder feeding subsystem of blowing in the embodiment of the present invention one.
The flow process of air: as Fig. 3, shown in Fig. 4, environment cold wind 61, air is sent in steam air heater 31 through air supply duct 30 by boiler fan 29, at the low-pressure steam 70 of the interior extraction opening not demonstrating in by the figure from Steam Turbine 502 of steam air heater 31, be heated to make the warm braw of a certain warm braw temperature that the weary air preheater 34 cold side metal wall temperatures of air meet design requirement, then by warm braw pipeline 33, introduced in the weary air preheater 34 of air, what low-pressure steam 70 produced after the interior heat release of steam air heater 31 hydrophobic 71 is sent back in Steam Turbine 502 condensate systems by drainage pump (not demonstrating in figure).Regulate for convenience warm braw temperature, at the other air-supply bypass duct 32 that is provided with of steam air heater 31.Warm braw in warm braw pipeline 33 is at the interior hot blast that is further heated to the required hot blast temperature of boiler combustion by flue gas of the weary air preheater 34 of air.The hot blast major part of the weary air preheater 34 air side outlets of air is introduced secondary air bellow 38 as Secondary Air through Secondary Air hot air duct 37, and is distributed and drawn toward burner 12 from secondary air box 38.Another small part hot blast is introduced a wind mixing chamber 39 through a wind-heat wind pipeline 36, in a wind mixing chamber 39 with from pressure fan 29 outlet the cold wind that attracted by first cooling by wind wind pipeline 35, be mixed to by a certain percentage the required warm air temperature of coal dust safe transport and smooth combustion, a wind of wind mixing chamber 39 outlets enters in supercharging primary air fan 41 through a wind-heat wind pipeline 40, after being pressurized, be sent to wind bellows 42 one time, from wind bellows 42, distribute and draw toward air and powder mixer 10 again, and then coal dust is sent into the hearth combustion of boiler 13.
Fig. 5 is the structural representation of the embodiment of the present invention one middle open type powder process steam heating type boiler unit.
As shown in Figure 5, the operation principle of open type powder process steam heating type boiler unit 501:
The flow process of coal: raw coal 60 delivers into raw coal pre-drying device 3 by run coal bin 1 through feeder 2, in raw coal pre-drying device 3, mix and descending the predrying of raw coal that complete with the drier from drier mixing chamber 20, blower mill 4 will be ground into coal dust by the dried coal of raw coal pre-drying device 3, coal dust will further be dried simultaneously.The weary gas of blower mill 4 outlets (gas of blower mill 4 outlets is called weary gas) enters mill separator 5 with the mixture of coal dust, mill separator 5 is isolated coal particle thicker in wind powder mixture and the import of air blow and return fan coal pulverizer 4 again, qualified coal dust and the mixture of weary gas enter coal collector 7 by powder process pipeline 6, coal collector 7 carries out separated by weary gas with coal dust, Pulverized Coal Bin 8 stores coal dust, coal dust in Pulverized Coal Bin 8 is sent into air and powder mixer 10 by feeder 9, in air and powder mixer 10, mix with a wind from wind bellows 42, then by powder feeding pipes 11, be sent to the stove chamber inner combustion that coal burner 12 enters boiler 13.
Flue gas flow: coal dust and air generate flue gas at the stove chamber inner combustion of boiler 13, and the flue gas in burner hearth is divided into two strands at furnace outlet.One is taken out mouthful 19 drier components of extracting out as powder process subsystem 401 by blower mill 4 from flue gas, and another strand is still retained in the interior follow-up heating surface of heating that continues of flue of boiler 13, and discharges boiler 13 by the outlet of the weary air preheater 34 of air.The flue gas of the weary air preheater 34 fume side outlets of air is introduced boiler induced-draft fan 15 after deduster 14 purifies, and after mixing with the cold weary gas of outlet from weary air water recovery subsystem 404, enter flue gas desulfur device 17 in the smoke discharging pipe 16 of air-introduced machine 15 outlet, the flue gas 62 that passes through desulfurizing and purifying by chimney 18 discharged to atmospheric environment.
Drier flow process: by flue gas take out mouthfuls 19 high-temperature flue gas that extract with weary gas from recirculation blast pipe road 23, also have the weary gas of heat via the weary air preheater 34 heating gained of air, after these three kinds of components are mixed in drier mixing chamber 20, obtain the required drier of powder process subsystem 401, this drier enters raw coal pre-drying device 3 via drier pipeline 21, thereby drier mixes with coal and descendingly to coal, carries out predrying in raw coal pre-drying device 3.
Weary air-flow journey: drier, the powder process subsystem 401 of weary gas origin self-desiccation agent mixing chamber 20 leaks out and the transpiring moisture of coal forms.Weary gas carries out separated with coal dust in coal collector 7, isolated weary gas is extracted out by weary gas blower fan 22 and is divided into two-way, the first via is sent into drier mixing chamber 20, the second tunnels and through blast pipe road 24, is sent into weary air water retracting device 25 by recycling blast pipe road 23 as drier temperature control medium.The weary gas of high hygroscopic water is cooled by refrigerant 70 weary air water retracting device 25 is interior, thereby obtains a large amount of aqueous waters, and aqueous water combines in collecting-tank 27.A part for the cold weary gas that weary air water recovery system 25 is discharged is drawn through cold blast pipe road 28 toward boiler exhaust gas pipeline 16, enters flue gas desulphurization system 17 together with the flue gas mixing of discharging from boiler 13.Another part of the cold weary gas that weary air water recovery system 25 is discharged adds thermosetting as the drier weary gas of heat of a component wherein via the weary air preheater 34 of air.
The effect of embodiment mono-and effect
1) in the weary gas of high-moisture coal pulverizing system, be enriched with large quantity of moisture, water dew point temperature is high, by recyclable a large amount of liquid condensate water of weary air cooling, has outstanding water and reclaims benefit.In addition, cold weary gas mixes with boiler exhaust gas that can to make to enter the cigarette temperature drop of flue gas desulphurization system low, thereby in flue gas desulphurization system, can save a large amount of flue gas cool-down water consumptions, has considerable water-saving benefit.
2) using high-temperature flue gas and the weary gas of recirculation and hot weary gas mixing as drier, can obviously reduce drier oxygen content, powder process subsystem is moved under inerting atmosphere, further improve the safety in operation of high volatile coal pulverized coal preparation system; And, can further improve weary gas water capacity and water dew point, thereby being reclaimed more easily, realizes weary air water.
3) weary gas does not enter burner hearth and adopts pulverized coal carried by hot air, can make that flame temperature in burner hearth raises, breeze airflow ignition heat reduces, a wind oxygen concentration improves, thereby can obviously improve catching fire and after-flame performance of coal dust firing, thereby low NOx combustion in burner hearth is organized to also favourable minimizing unit pollutant emission.
4) from extracting a part of stove cigarette near furnace outlet, as drier component and weary gas, do not enter burner hearth, and newly-increased one weary aspiration heat in air preheater, can make the flue gas/cold WATER AS FLOW MEDIUM equivalent proportion in the weary air preheater of air obviously reduce, thereby the weary gas of low temperature enters the weary air preheater of air and is conducive to improve heat transfer temperature difference and reduces preheater heat exchange area, and the weary air preheater outlet of air exhaust gas temperature is significantly reduced; Meanwhile, for avoiding volatile matter in coal to separate out, adopted lower coal pulverizer outlet temperature in pulverizing process, also lower coal collector exports weary temperature degree.Owing to forming the weary air preheater outlet flue gas of air of open type powder process steam heating type boiler unit smoke evacuation and coal collector, to export the equal temperature of weary gas lower, thereby the heat loss due to exhaust gas of comparing open type powder process steam heating type boiler unit of the present invention with existing boiler unit significantly reduces, correspondingly boiler thermal output obviously improves.
5) because be provided with the low-pressure steam utilizing from Steam Turbine before the air-supply entrance of the weary air preheater of air, environment cold wind is carried out to the cold wind preheating device of preheating, make the wind that enters the weary air preheater of air first in cold wind preheating device, obtain preheating to a certain extent, can when thereby boiler adopts lower exhaust gas temperature to improve boiler thermal output, guarantee that cold end corrosion does not occur the weary air preheater cold side metal of air heating surface thus, thereby guarantee the weary air preheater safe operation of air.Meanwhile, this also makes the used heat that condenses of a part of unit low-pressure steam be blown and be recycled by open type powder process steam heating type boiler unit by preboiler, and from Thermal System of Fossil Fuel-Fired Power Station, this has further improved the generating efficiency of power plant.And, when reducing due to exhaust gas volumn in air preheater, cold rate-of flow obviously increases because increasing one weary gas newly, make the exhaust gas temperature can be very low, therefore boiler air-supply need be preheated to higher warm braw temperature, to keep air preheater cold-end air metal temperature can make 70～85 ℃ of scopes that corrosion rate is lower, the used heat that condenses that this means more extracted steam from turbines is effectively back to power plant thermal system, and power plant efficiency is further improved.
6) a wind blender is set and can regulates easily air temperature one time, thereby guarantee powder feeding safety and breeze airflow combustion stability; By adjusting, recycle weary tolerance and can regulate easily desiccant temperature, thereby guarantee the predrying effect of high-temperature flue gas to raw coal in raw coal pre-drying device; By coal pulverizer air quantity is set, regulate pipeline, can make coal pulverizer work under optimal ventilation amount, thereby guarantee pulverizer capacity and reduce powder process power consumption.
The open type powder process steam heating type boiler unit and the electricity generation system that according to the present embodiment one, provide, because be provided with coal collector at outlet of coarse powder separating device, make coal dust and weary gas separated at coal collector, coal dust is sent into stove chamber inner combustion by a wind, and weary gas enters weary air water retracting device and carries out being discharged into after cooling after boiler exhaust gas pipeline before flue gas desulfur device mixes with the weary air preheater outlet of air smoke evacuation and enter flue gas desulfur device.And, the volatile matter of considering the hydrogenous coals such as brown coal is higher, the air-supply powder feeding subsystem that has adopted wind and Secondary Air temperature to regulate and control, air temperature can guarantee that breeze airflow enters stable ignition burning after stove, also can avoid coal dust at powder feeding combustion inner pipe.Simultaneously, according to the needs of air-supply powder feeding subsystem, cold wind is divided into two-way, one road cold wind enters the weary air preheater of air after steam air heater heating, by the weary air preheater of air, further heated and obtain hot blast, the burner hearth that a part for this hot blast enters boiler as Secondary Air is combustion-supporting, another part blending of another road cold wind and hot blast to after the temperature requiring as wind pulverized coal conveying the stove chamber inner combustion to boiler.So, compare with traditional blowing powder producing subsystem boiler, although in a slight decrease for an air temperature of powder feeding, but wind air quantity significantly reduces due to one time, the ignition heat of wind powder mixture obviously reduces, and in a wind, the concentration of oxygen obviously improves in addition, and coal-powder steady flame performance is obviously improved.And, adopting after above-mentioned powder process subsystem, in the burner hearth of boiler, flame temperature can obviously improve, and has further strengthened coal powder ignition and after-flame performance.
In addition, because the flue gas producing in burner hearth is taken out mouthful outlet at flue gas and is divided into two strands, one of 10-20% that accounts for amount of flue gas emission in boiler furnace enters powder process subsystem as drier component and discharged by coal collector outlet, another strand is retained in the burner hearth of boiler the carbonated drink working medium in the follow-up heating surface of heating and discharged by the weary air preheater outlet of air, therefore the exhaust gas volumn that, enters the weary air preheater of air obviously reduces.And the drier that enters raw coal pre-drying device can be carried out the adjusting of temperature by weary gas, make the temperature of drier be unlikely to too high and cause too much the separating out of volatile matter in coal.Generally, adopt after above-mentioned powder process subsystem and air-supply powder feeding subsystem, hot/cold WATER AS FLOW MEDIUM equivalent proportion in the weary air preheater of air obviously reduces, and also under the heat transfer temperature difference of the weary air preheater of identical air hot junction, the weary air preheater outlet of air exhaust gas temperature can obviously reduce.Thereby, having benefited from the weary air preheater outlet exhaust gas temperature of low air and coal collector and export weary temperature degree, the open type powder process steam heating type boiler unit in embodiment mono-can make boiler exhaust gas heat loss significantly reduce, and boiler thermal output obviously improves.
In addition, when reducing due to exhaust gas volumn in the weary air preheater of air, cold rate-of flow obviously increases because increasing one weary gas newly, make the exhaust gas temperature can be very low, therefore, in the present embodiment, need boiler air-supply to be preheated to higher temperature, to keep air preheater cold-end air metal temperature can make 70～85 ℃ of scopes that corrosion rate is lower, this means that the used heat that condenses of more extracted steam from turbines is effectively back to power plant thermal system.Thereby open type powder process steam heating type boiler unit and the electricity generation system of the present embodiment one can make power plant efficiency further improve.At the exhaust gas temperature of coal-fired power station boiler, choose the middle impact of fume side cold end corrosion on the weary air preheater cold junction of air heating surface trouble free service that need to consider.For corrosion rate is controlled in allowed band, in engineering design, General Requirements makes the weary air preheater cold side metal of air temperature be not less than 70 ℃.Employing utilizes after the powder process subsystem of partial fume as drier chief component, with the weary air preheater outlet of air exhaust gas temperature, significantly reduces, and the weary air preheater cold side metal of air temperature can be too low.For head it off, the wind that enters the weary air preheater of air in the present embodiment first heats through steam air heater, to improve the weary air preheater cold side metal of air temperature, thereby can meet engineering design requirement.
In conventional Generator Set, though steam warming machine makes the used heat that condenses of a part of steam turbine low-pressure steam enter the wind of the weary air preheater of air for preheating, but also make exhaust gas temperature raise simultaneously, the overall harmful effect causing is that putting into operation of steam air heater makes unit generation efficiency be tending towards reducing.Therefore steam warming machine belongs to stand-by equipment in existing thermal power plant, when only in the winter time etc. environment temperature is lower, to enable so that the weary air preheater cold side metal of air temperature is unlikely too low, steam air heater outlet wind-warm syndrome is also designed to slightly higher than boiler design cold wind temperature.In contrast to this, in the present embodiment, steam air heater is normal throwing equipment of the four seasons, and because the weary air preheater outlet of air exhaust gas temperature is lower, steam air heater outlet wind-warm syndrome is relatively high.Visible, the above-mentioned powder process subsystem of use in conjunction and steam air heater, thereby can under the condition that guarantees the weary air preheater cold side metal of air heating surface security of operation, further reduce exhaust gas temperature and improve boiler thermal output, also make the used heat that condenses of a part of unit low-pressure steam for reheated blast, further improved the generating efficiency of open type powder process steam heating type boiler unit simultaneously.
In addition, the cold weary gas of weary air water retracting device outlet is discharged into afterbody boiler exhaust gas pipeline, enters flue gas desulfur device together with after mixing with the smoke evacuation of deduster outlet.The wet method fume desulfurizing system of Thermal Power Generation Industry extensive use need to consume great lot of water resources, wherein flue gas cool-down water consumption accounts for major part, because cold weary gas in the present embodiment one has to boiler exhaust gas the effect of cooling, the flue gas cool-down water consumption that therefore can obviously reduce desulphurization system, this makes the present embodiment electricity generation system have appreciable water-saving benefit.
In addition, what blowing powder producing subsystem dry from traditional second medium (high-temperature flue gas+hot blast) and that three media (high-temperature flue gas+hot blast+cold smoke) are dry was different is, the present embodiment one be using open type powder process steam heating type boiler furnace outlet high-temperature flue gas, recycle weary gas and via the weary air preheater of the air that is positioned at flue afterbody, heat the weary gas of formed heat and mix after as the drier of powder process subsystem, recycle weary gas and work to coordinate blower mill ventilation and powder process subsystem drying capacity.Known, this powder process subsystem at least has following two advantages: under identical powder process subsystem drying capacity, can further improve weary gas water capacity and reduce weary gas discharge capacity, this is highly beneficial to realizing economic weary air water reclaimer, and the weary air water of also further having given prominence to the present embodiment one open type powder process steam heating type boiler unit reclaims advantage; Drier oxygen content obviously reduces, and has improved the security of high volatile coal powder process subsystem operation.
In addition, because regulate pipeline the ventilation of blower mill can be controlled to optimal ventilation amount by coal pulverizer air quantity, so can reduce the coal-grinding power consumption of blower mill.
To sum up, embodiment mono-can provide a kind of green high-efficient coal generating system, solved the unsettled problem of high-moisture coal-fired boiler combustion, reduced the coal-grinding power consumption of coal pulverizer, overcome the inefficient shortcoming of traditional high-moisture coal-fired boiler hot, when significantly improving boiler thermal output and unit generation efficiency, solved the security of operation problem of the weary air preheater cold side metal of air heating surface, powder process subsystem moves the safety in operation that has improved high volatile coal powder process subsystem under inerting atmosphere, the weary gas water capacity of powder process subsystem and water dew point have obviously been improved, both make weary air water reclaim and be easy to Project Realization, also make to be increased by cooling weary gas gained condensing capacity.
< embodiment bis->
For structure identical with embodiment mono-in embodiment bis-, adopt identical numbering and omit related description.
Fig. 6 is the construction module schematic diagram of the embodiment of the present invention two middle open type powder process steam heating type boiler units.
As shown in Figure 6, open type powder process steam heating type boiler unit 200 comprises: powder process subsystem 401, boiler body subsystem 402, air-supply powder feeding subsystem 203, weary air water reclaim subsystem 404 and gas cleaning subsystem 405.
Visible, the open type powder process steam heating type boiler machine group system 200 in the present embodiment two is compared with embodiment mono-, and difference is only the powder feeding subsystem of blowing.In the present embodiment two, air-supply powder feeding subsystem 203 is that wind and two separate flow processs of secondary air separating are completed.
Air-supply powder feeding subsystem 203 comprises: Secondary Air pressure fan 29, Secondary Air air supply duct 30, Secondary Air steam air heater 31, Secondary Air bypass duct 32, Secondary Air warm braw pipeline 33, the weary air preheater 34 of air, Secondary Air hot air duct 37, secondary air bellow 38, wind-warm syndrome wind pipeline 240, wind bellows 242, air and powder mixer 10, powder feeding pipes 11, wind pressure fan 243, first cooling by wind wind pipeline 244, wind steam warming machine 245 and a wind bypass duct 246.
Fig. 7 is the structural representation of the embodiment of the present invention two middle open type powder process steam heating type boiler units.
As shown in Figure 7, air-supply powder feeding subsystem 203 workflows comprise:
Distinguished and admirable journey once: a wind blower fan 243 extracts cold wind 261 and is also sent to wind steam air heater 245 one time by first cooling by wind wind pipeline 244, an other wind bypass duct 246 that is provided with a time of wind steam air heater 245,270 pairs of cold wind of low-pressure steam that wind steam air heater 245 is used to gas bleeder steam mouth heat and obtain warm braw, and what low-pressure steam 270 produced after an interior heat release of steam air heater 245 hydrophobic 271 is sent back in Steam Turbine 502 condensate systems by drainage pump (not demonstrating in figure).This warm braw enters into wind bellows 242 as a wind one time by a wind pipeline 240,242 pairs of wind of wind bellows distribute laggardly to enter air and powder mixer 10 and be mixed to get wind powder mixture with the coal dust from machine supplying powder 9, and this wind powder mixture enters into the hearth combustion of boiler 13 afterwards.
Secondary Air flow process: Secondary Air blower fan 29 extracts cold wind 61 and is sent to Secondary Air steam air heater 31 by Secondary Air air supply duct 30, the other Secondary Air bypass duct 32 that is provided with of Secondary Air steam air heater 31, Secondary Air steam air heater 31 utilizes the low-pressure steam from bleeder steam mouth to heat and obtain warm braw cold wind, this warm braw enters into the weary air preheater 34 of air by Secondary Air warm braw pipeline 33 and further heats and obtain hot blast, this hot blast as Secondary Air, by Secondary Air hot air duct 37, enter into secondary air bellow 38, the burner hearth that is sent to boiler 13 after 38 pairs of Secondary Airs of secondary air bellow distribute is combustion-supporting.
The effect of embodiment bis-and effect
According to the open type powder process steam heating type boiler unit of embodiment bis-, except thering is the effect identical with the open type powder process steam heating type boiler unit of embodiment mono-, because wind and Secondary Air adopt relatively independent flow process, so not only the air quantity of wind and Secondary Air regulates relative conveniently, and has reduced the power consumption of blower fan.
By the beneficial effect that adopts the hot weary band of gas in drier, be, can make drier oxygen-content reduction, thereby pulverized coal preparation system is moved under inerting atmosphere, improve the safety in operation of high volatile coal pulverized coal preparation system.Thereby can make pulverized coal preparation system operation safer.
Though in the present invention, drier take that to contain the weary gas of recirculation be example, also comprises recycling cancellation scheme or the replacement scheme of weary gas simultaneously.It can be also to export a part in weary gas from coal pulverizer that recirculation is got angry, and the weary gas exporting mixes with flue gas, is conducive to further improve weary air water dew point and water capacity from coal pulverizer, is easier to by weary air water retracting device, the water in weary gas be reclaimed.
Certainly open type powder process steam heating type boiler unit and electricity generation system involved in the present invention is not merely defined in structure in the above-described embodiments.Above content is only the basic explanation of the present invention under conceiving, and according to any equivalent transformation that technical scheme of the present invention is done, all should belong to protection scope of the present invention.
Claims (10)
1. an open type powder process steam heating type boiler unit, for raw coal being burnt and being connected with the Steam Turbine that contains steam turbine, is characterized in that, comprising:
Powder process subsystem, boiler body subsystem, air-supply powder feeding subsystem and weary air water reclaim subsystem,
Wherein, described powder process subsystem comprises: raw coal pre-drying device, gas powder generating apparatus, coal collector, Pulverized Coal Bin, the machine supplying powder connecting in turn and the drier mixing chamber being connected with described raw coal pre-drying device,
Described boiler body subsystem comprises: burner hearth, the flue being connected with the afterbody of described burner hearth, be positioned at the coal burner of described burner hearth entry position and near be positioned at the exhanst gas outlet of described burner hearth flue gas is taken out mouth,
Described air-supply powder feeding subsystem comprises: air and powder mixer, the wind mixing chamber being connected with described air and powder mixer, be positioned at cold wind preheating device described flue afterbody, that be connected with the weary air preheater of described air and for the pressure fan of environment cold wind is provided,
Described weary air water reclaims subsystem and comprises: the weary air water retracting device being connected with the gas vent of described coal collector,
The utilization of described raw coal pre-drying device is carried out predrying to described raw coal from the drier of described drier mixing chamber,
Described gas powder generating apparatus obtains primary mixture after dried described raw coal being ground and being further dried,
Described coal collector carries out separation to described primary mixture and obtains coal dust and weary gas,
Described Pulverized Coal Bin stores described coal dust,
Described machine supplying powder is for measuring and regulate the boiler coal feeding amount flow to described air and powder mixer of controlling,
Described air and powder mixer is mixed to get wind powder mixture to wind from described air-supply powder feeding subsystem and described coal dust,
Described coal burner burns to the described coal dust in described wind powder mixture,
Described coal dust generates flue gas in the internal-combustion of described burner hearth,
The low-pressure steam that described cold wind preheating device utilizes the extraction opening of described steam turbine to extract out preheats and obtains warm braw a part for described environment cold wind,
The weary air preheater of described air further heats and obtains hot blast described warm braw, another part of a part for described hot blast and described environment cold wind after a described wind mixing chamber mixes as a described wind, another part of described hot blast is directly sent into described coal burner as Secondary Air
Described air and powder mixer is mixed to get described wind powder mixture by a described wind and described coal dust,
The moisture that described weary air water retracting device is introduced the weary gas of the first in described weary gas in the weary gas of Bing Jianggai first reclaims,
The weary air preheater of described air is connected with described weary air water retracting device, and the cold weary gas carrying out after described moisture recovery is heated to the hot weary gas of rear formation,
Described drier mixing chamber is taken out and mouthful is connected with the gas vent of described coal collector with described flue gas respectively, using the weary gas of second portion in described weary gas, take out the part of described flue gas of mouth extraction and the weary gas of described heat mix and send into described raw coal pre-drying device as described drier from described flue gas.
2. open type powder process steam heating type boiler unit according to claim 1, is characterized in that:
Wherein, described weary air water retracting device comprises: be connected with the gas vent of described coal collector, and the blast pipe road that described weary gas is carried, the weary air water recover being connected with described blast pipe road and the collecting-tank that stores described weary air water.
3. open type powder process steam heating type boiler unit according to claim 1, is characterized in that:
Wherein, described cold wind preheating device has: utilize steam air heater that described low-pressure steam heats described environment cold wind and for the environment cold wind after heating being introduced to the warm braw pipeline of the weary air preheater of described air.
4. according to the open type powder process steam heating type boiler unit described in any one in claims 1 to 3, it is characterized in that:
Wherein, described powder process subsystem also comprises that one end is connected with the weary gas outlet of described coal collector, the air quantity that the other end is connected with the import of described gas powder generating apparatus regulates pipeline, enters described gas powder generating apparatus supplement the air quantity that adjusting enters described gas powder generating apparatus for the weary pneumatic transmission of third part that described weary gas is exported to the described weary gas of sending.
5. an electricity generation system, is characterized in that, comprising:
Open type powder process steam heating type boiler unit and the Steam Turbine that contains steam turbine,
Wherein, described open type powder process steam heating type boiler unit and described Steam Turbine are the claims 1 to open type powder process steam heating type boiler unit and the Steam Turbine described in any one in claim 4.
6. an open type powder process steam heating type boiler unit, for raw coal being burnt and being connected with the Steam Turbine that contains steam turbine, is characterized in that, comprises:
Powder process subsystem, boiler body subsystem, air-supply powder feeding subsystem and weary air water reclaim subsystem,
Wherein, described powder process subsystem comprises: raw coal pre-drying device, gas powder generating apparatus, coal collector, Pulverized Coal Bin, the machine supplying powder connecting in turn and the drier mixing chamber being connected with described raw coal pre-drying device,
Described boiler body subsystem comprises: burner hearth, flue, be positioned at the coal burner of described burner hearth entry position and near be positioned at the exhanst gas outlet of described burner hearth flue gas is taken out mouth,
Described air-supply powder feeding subsystem comprises: the first cold wind preheating device, three minutes weary air preheaters of storehouse swinging air that are positioned at described flue afterbody and the second cold wind preheating device being connected with the weary air preheater of described air,
Described weary air water reclaims subsystem and comprises: the weary air water retracting device being connected with the gas vent of described coal collector,
The utilization of described raw coal pre-drying device is carried out predrying to described raw coal from the drier of described drier mixing chamber,
Described gas powder generating apparatus obtains primary mixture after dried described raw coal being ground and being further dried,
Described coal collector carries out separation to described primary mixture and obtains coal dust and weary gas,
Described Pulverized Coal Bin stores described coal dust, and described machine supplying powder is for measuring and regulate the boiler coal feeding amount flow to described air and powder mixer of controlling,
Described air and powder mixer is mixed to get wind powder mixture to wind from described air-supply powder feeding subsystem and described coal dust,
Described coal burner burns to the described coal dust in described wind powder mixture,
Described coal dust generates flue gas at described stove chamber inner combustion,
The low-pressure steam that described the first cold wind preheating device utilizes the extraction opening of described steam turbine to extract out heats the hot blast of first environment cold wind generation as a described wind,
The low-pressure steam heating second environment cold wind that described the second cold wind preheating device utilizes the extraction opening of described steam turbine to extract out, enters the weary air preheater of the described air hot blast that further heating generates afterwards as Secondary Air,
Described air and powder mixer is mixed to get wind powder mixture by a described wind and described coal dust,
Described Secondary Air directly enters described coal burner,
Described weary air water retracting device is introduced the weary gas of described Fa Qizhong first the moisture in weary gas is reclaimed,
The weary air preheater of described air is connected with described weary air water retracting device, and the cold weary gas carrying out after described moisture recovery is heated to the hot weary gas of rear formation,
Described drier mixing chamber is also taken out and mouthful is connected with the gas vent of described coal collector with described flue gas respectively, using the weary gas of second portion in described weary gas, take out the part of described flue gas of mouth extraction and the weary gas of described heat mix and send into described raw coal pre-drying device as described drier from described flue gas.
7. open type powder process steam heating type boiler unit according to claim 6, is characterized in that:
Wherein, described weary air water retracting device comprises: be connected with the gas vent of described coal collector, and the blast pipe road that described weary gas is carried, the weary air water recover being connected with described blast pipe road and the collecting-tank that stores described weary air water.
8. open type powder process steam heating type boiler unit according to claim 6, is characterized in that:
Wherein, described the first cold wind preheating device has: utilize the wind steam air heater that described low-pressure steam heats described first environment cold wind and the warm braw pipeline of a described wind being introduced to air and powder mixer,
Described the second cold wind preheating device has: utilize the Secondary Air steam air heater that described low-pressure steam heats described second environment cold wind and the Secondary Air warm braw pipeline of described Secondary Air being introduced to the weary air preheater of described air.
9. according to the open type powder process steam heating type boiler unit described in any one in claim 6 to 8, it is characterized in that:
Wherein, described powder process subsystem also comprises that one end is connected with the weary gas outlet of described coal collector, the air quantity that the other end is connected with the import of described gas powder generating apparatus regulates pipeline, enters described gas powder generating apparatus supplement the air quantity that adjusting enters described gas powder generating apparatus for the weary pneumatic transmission that a part is sent from described weary gas outlet.
10. an electricity generation system, is characterized in that, comprising:
Open type powder process steam heating type boiler unit and the Steam Turbine that contains steam turbine, wherein, described open type powder process steam heating type boiler unit and described Steam Turbine are open type powder process steam heating type boiler unit and the Steam Turbine described in any one in the claims 6 to 9.
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| CN104373947A (en) * | 2014-11-13 | 2015-02-25 | 上海理工大学 | Superheated steam drying powder making type coal-fired power generation system |
| CN104373951A (en) * | 2014-11-13 | 2015-02-25 | 上海理工大学 | Superheated steam drying powder making type coal-fired power generation system |
| CN108469034A (en) * | 2018-04-23 | 2018-08-31 | 西安热工研究院有限公司 | A kind of integral system and method carrying out flue gas deep treatment using drying brown coal lack of gas |
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| CN104373951A (en) * | 2014-11-13 | 2015-02-25 | 上海理工大学 | Superheated steam drying powder making type coal-fired power generation system |
| CN108469034A (en) * | 2018-04-23 | 2018-08-31 | 西安热工研究院有限公司 | A kind of integral system and method carrying out flue gas deep treatment using drying brown coal lack of gas |
| CN108469034B (en) * | 2018-04-23 | 2024-03-12 | 西安热工研究院有限公司 | Integrated system and method for deep treatment of flue gas by utilizing dry brown coal exhaust gas |
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