CN104132359A - 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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- CN104132359A CN104132359A CN201410371144.8A CN201410371144A CN104132359A CN 104132359 A CN104132359 A CN 104132359A CN 201410371144 A CN201410371144 A CN 201410371144A CN 104132359 A CN104132359 A CN 104132359A
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention provides an open powder making steam warm air type boiler unit connected with a turbine unit with a turbine. The open powder making steam warm air type boiler unit is characterized in that a weighing coal feeder meters, adjusts and controls the raw coal weight corresponding to the boiler coal supply quantity fed into a hearth, an air lock is used for preventing coal powder against air channeling so as to keep the coal powder smooth in circulation, an air preheater further heats warm air to obtain hot air, the first 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 the coal powder to obtain air and powder mixtures, the second part of the hot air is used as secondary air to be directly fed into a coal powder burner, the third part of the hot air is directly fed into a drying agent mixing chamber, the drying agent mixing chamber is respectively connected with a smoke extraction opening and a gas outlet of a coal powder collector, and the other part of exhaust, part of smoke extracted out of the smoke extraction opening and the third part of the hot air are mixed and used as drying agents to be fed into 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.Account for world's coal gross reserves 40% at worldwide brown coal.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.
Utilize level for improving brown coal, carried out the brown coal drying technical research of various ways both at home and abroad.With the thermal power plant integrated predrying technology of drawing gas by predrying for brown coal steam condensation used heat, 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 transport 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.
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 compared with conventional bituminous coal fired boiler, the thermal efficiency of these boiler using brown coals lower (approximately low 2 percentage points) and price 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 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.
In conventional bin storage type pulverizing system boiler, in order to there is certain coal supply buffer capacity, make pulverizing process and combustion process relatively independent, often be provided with Pulverized Coal Bin, but, for the high-volatile coal such as brown coal and accurate eastern coal, Pulverized Coal Bin is set in pulverized coal preparation system and stores inflammable and explosive high volatile coal dust, Explosion-proof Design to this Pulverized Coal Bin is had relatively high expectations, and has increased the difficulty that ensures pulverized coal preparation system security of operation.
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
Carry out in order to address the above problem, 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, and can also realize open type powder process steam heating type boiler unit and the electricity generation system thereof that high efficiency is generated electricity, this open type powder process steam heating type boiler unit and electricity generation system thereof especially can more make full use of the used heat that condenses of Steam Turbine low pressure steam under the prerequisite that keeps air preheater cold-end air metal temperature.
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 weighing coal feeder connecting in turn, raw coal pre-drying device, gas powder generating apparatus, coal collector, flapper 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 be 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 the air preheater of flue afterbody, the cold wind preheating device being connected with air preheater 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, control is measured and regulated to the weighing coal feeder pair raw coal weight corresponding with the boiler coal feeding amount of sending into burner hearth, 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 separates and obtains coal dust and weary gas primary mixture, flapper is used for preventing coal dust generation air channelling and maintains coal dust circulating smoothly, 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 environment cold wind, air preheater further heats and obtains hot blast warm braw, after the Part I of hot blast mixes in a wind mixing chamber with environment cold wind as a wind, the Part II of hot blast is directly sent into coal burner as Secondary Air, the Part III of hot blast is directly sent into drier mixing chamber, wind and coal dust are mixed to get wind powder mixture by air and powder mixer, weary air water retracting device is introduced weary the Part I of weary gas gas and the moisture in weary this Part I gas is reclaimed, drier mixing chamber is taken out mouth with flue gas respectively, the gas vent of coal collector is connected, by weary the Part II in weary gas gas, take out a mouthful part for the flue gas extracting from flue gas, and the Part III of hot blast is sent into raw coal pre-drying device as drier after mixing.
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 air preheater.
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 and supplement adjusting and enter the air quantity of gas powder generating apparatus for weary gas export to the weary pneumatic transmission of Part III of the weary gas of sending.
In addition, the present invention also provides a kind of electricity generation system, there is such feature: the open type powder process steam heating type boiler unit that raw coal is burnt 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 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 weighing coal feeder connecting in turn, raw coal pre-drying device, gas powder generating apparatus, coal collector, flapper, air and powder mixer 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 be 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, the the second cold wind preheating device that is positioned at the air preheater of flue afterbody and is connected with air preheater, weary air water reclaims subsystem and comprises: the weary air water retracting device being connected with the gas vent of coal collector, control is measured and regulated to the weighing coal feeder pair raw coal weight corresponding with the boiler coal feeding amount of sending into burner hearth, 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 separates and obtains coal dust and weary gas primary mixture, flapper is used for preventing coal dust generation air channelling and maintains coal dust circulating smoothly, 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 a part for the air preheater hot blast that further heating generates as Secondary Air, wind and coal dust are mixed to get wind powder mixture by air and powder mixer, Secondary Air directly enters coal burner, the moisture in weary gas is introduced and reclaimed to weary air water retracting device by a part for weary gas, drier mixing chamber also takes out mouthful with flue gas respectively and the gas vent of coal collector is connected, drier mixing chamber is by weary the Part II in weary gas gas, take out a mouthful part for the flue gas of extracting out from flue gas, and another part of hot blast is sent into raw coal pre-drying device as drier after mixing.
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 wind is introduced to the warm braw pipeline of 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 air preheater.
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 and supplement adjusting and enter the air quantity of gas powder generating apparatus for weary gas export to the weary pneumatic transmission of Part III of the weary gas of sending.
In addition, the present invention also provides a kind of electricity generation system, there is such feature: the open type powder process steam heating type boiler unit that raw coal is burnt 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 the mixture that formed after near the flue gas of the high temperature that extracts furnace outlet, the part that recycles weary gas and hot blast are mixed as powder process subsystem drier, can further improve weary gas water capacity and water dew point, moisture in weary gas can be recycled more economically effectively, simultaneously, cancel the Pulverized Coal Bin of storage high volatile coal dust, be conducive to simplify flour mill flow and reduce equipment investment and improve pulverized coal preparation system safety in operation.
And the flow that can recycle weary gas by adjusting regulates desiccant temperature easily, thereby ensure that coal pulverizer outlet temperature is within suitable scope.In addition, the Part I of the hot blast after air preheater heating 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.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 air preheater 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 air preheater to be tending towards reducing, the air preheater but the Part III that newly-increased one dry-heat air is hot blast is flowed through simultaneously, the air quantity of air preheater of making to flow through obviously increases, thereby, synthesis result is that cigarette/geomantic omen equivalent proportion of air preheater obviously reduces, also be that air preheater outlet 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.Due to the air preheater outlet flue gas of composition open type powder process steam heating type boiler unit smoke evacuation and coal collector, to export the equal temperature of weary gas lower, and compared with existing boiler unit, correspondingly boiler thermal output obviously improves.
And, utilize because be provided with before the air-supply entrance of air preheater the cold wind preheating device that environment cold wind is carried out to preheating from the low-pressure steam of Steam Turbine, make the wind that enters air preheater first in cold wind preheating device, obtain preheating to a certain extent, when improving boiler thermal output thus, ensure that cold end corrosion does not occur the metal heated face of air preheater cold-end air, thereby ensure air preheater safe operation.Simultaneously, utilizing the used heat that condenses of the low-pressure steam of Steam Turbine to carry out preheating environment cold wind blows 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 minimizing due to exhaust gas volumn in air preheater, air quantity uses hot blast obviously to increase because newly-increased one is dried, make the exhaust gas temperature can be very low, therefore need boiler air-supply to be preheated to higher warm braw temperature, to keep air preheater cold-end air metal temperature can make 70～85 DEG C 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 realize the moisture in weary gas to reclaim and recycle can also realize open type powder process steam heating type boiler unit and the electricity generation system thereof that generating efficiency is higher.
Brief description of the drawings
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.
Detailed description of the invention
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 formation high temperature and high pressure steam that raw coal produces in 501 burnings of open type powder process steam heating type boiler unit enters Steam Turbine 502 and does work, 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.
Air-supply powder feeding subsystem 403 forms a wind after environment cold wind 61 is processed, after mixing by a certain percentage, the coal dust that wind and powder process subsystem 401 grind rear formation to raw coal 60 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 the drier component 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, after dry weary gas after weary air water reclaims mixes with the smoke evacuation of boiler body subsystem 402, entering gas cleaning subsystem 405 purifies.
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, weighing coal feeder 2, raw coal pre-drying device 3, blower mill 4, mill separator 5, powder process pipeline 6, coal collector 7, recirculation blast pipe road 23, drier mixing chamber 20, drier pipeline 21, air quantity regulate pipeline 51 and flapper 52.Here, blower mill 4, mill separator 5 and powder process pipeline 6 have formed gas powder generating apparatus.Flapper 52 maintains coal dust for preventing coal dust generation air channelling and circulates smoothly.
Air quantity regulates pipeline 51 one end to be connected with the weary gas outlet of coal collector 7, the other end is connected with the import of gas powder generating apparatus, is that the weary pneumatic transmission of Part III enters gas powder generating apparatus and supplements to regulate and enter the air quantity of gas powder generating apparatus for a part is exported to the weary gas of sending from weary gas.
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, air preheater 34, 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, powder feeding pipes 11 and a heated-air drying pipeline 47.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 air water retracting device.Weary air water retracting device comprises: weary gas blower fan 22, blast pipe road 24, weary air water recover 25, weary gas bypass duct 26, collecting-tank 27 and cold blast pipe road 28.
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 entirety:
Run coal bin 1, weighing coal 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, heated-air drying pipeline 47 is connected, coal collector 7 is also connected with the import of flapper 52 with weary gas blower fan 22 respectively, the outlet of flapper 52 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.Air preheater 34 is positioned at the afterbody of the flue of boiler 13.
Boiler fan 29 exports respectively and is connected with the cold wind import of steam air heater 31 and the cold wind import of a wind blender 39, the hot-air mouth of steam air heater 31 is connected with the bleeding point 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 air preheater 34, the air side outlet of air preheater 34 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, a wind booster fan 41 exports with the import of wind bellows 42 and is connected, the outlet of wind bellows 42 is connected with the import of air and powder mixer 10.
Steam air heater 31 and cold wind preheating device by-pass line 32 are connected to preheating pipe 33 jointly, and one end of heated-air drying pipeline 47 is by separating and form through the preheating pipe 33 of air preheater 34, and the other end connects and enters drier mixing chamber 20.
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 recover 25 is connected with blast pipe road 24, weary air water recover 25 has cooling medium entrance 80 and cooling medium outlet 81, weary gas bypass duct 26 is in parallel with weary air water recover 25, collecting-tank 27 is connected with weary air water recover 25, store the moisture in the weary gas being reclaimed by weary air water recover 25, the cold weary gas reclaiming after the moisture in weary gas through weary air water recover 25 is discharged to boiler exhaust gas pipeline 16 through cold blast pipe road 28.
Deduster 14 imports are connected with the fume side outlet of air preheater 34, deduster 14 exports with air-introduced machine 15 imports and is connected, 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 exports with chimney 18 and is connected.
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 shown in Figure 3, Figure 4, environment cold wind 61 is that air is sent in steam air heater 31 through air supply duct 30 by pressure fan 29, be heated to make the warm braw of a certain warm braw temperature that air preheater 34 cold side metal wall temperatures meet design requirement 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, then introduced in air preheater 34 by warm braw pipeline 33, what low-pressure steam 70 produced after the interior heat release of steam air heater 31 hydrophobic 71 sends the condensate system of Steam Turbine 502 back to by drainage pump (not shown in FIG.).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 air preheater 34.Most of hot blast of air preheater 34 air side outlets is that the Part II of hot blast 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.Also having a small part hot blast is that the Part I of hot blast is introduced wind mixing chamber 39 one time through a wind-heat wind pipeline 36, in a wind mixing chamber 39, be mixed to by a certain percentage coal dust safe transport and the required warm air temperature of smooth combustion with the cold wind that exports and attracted by first cooling by wind wind pipeline 35 from pressure fan 29, the wind that wind mixing chamber 39 exports 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, distribute and draw toward air and powder mixer 10 from wind bellows 42 again, and then coal dust is sent into the hearth combustion of boiler 13, part hot blast is that the Part III of hot blast enters drier mixing chamber 20 after heated-air drying pipeline 47 in addition, the Part III of hot blast, take out mouthful 19 flue gases of extracting out mix with the weary gas of Part I and obtain drier from flue gas.
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 weighing coal feeder 2, weighing coal feeder 2 measures and regulates control to the raw coal weight corresponding with the boiler coal feeding amount of sending into burner hearth, in raw coal pre-drying device 3 with mix from the drier of drier mixing chamber 20 and descending the predrying of raw coal that complete, 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 (gas that blower mill 4 exports is called weary gas) that blower mill 4 exports 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 separates 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 weighing coal feeder 9, in air and powder mixer 10, mix with a wind from wind bellows 42, then be sent to coal burner 12 and enter the stove chamber inner combustion of boiler 13 by powder feeding pipes 11.
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 air preheater 34.The flue gas of air preheater 34 fume side outlets is introduced boiler induced-draft fan 15 after deduster 14 purifies, and after mixing with the cold weary gas that reclaims the outlet of subsystem 404 from weary air water in the smoke discharging pipe 16 exporting at air-introduced machine 15, enter flue gas desulfur device 17, the flue gas 62 that passes through desulfurizing and purifying by chimney 18 discharged to atmospheric environment.
Drier flow process: drier is taken out mouthfuls 19 high-temperature flue gas that extract with weary gas from recirculation blast pipe road 23, form from a part in the hot blast of heated-air drying pipeline 47 in addition by flue gas, 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 carries out predrying to coal 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 separates in coal collector 7 with coal dust, isolated weary gas is extracted out by weary gas blower fan 22 and is divided into three tunnels, be respectively the weary gas of Part I, the weary gas of Part II and the weary gas of Part III, the weary gas of Part I is sent into drier mixing chamber 20 as drier temperature control medium by recycling blast pipe road 23, the weary gas of Part II is sent into weary air water recover 25 by blast pipe road 24, and the weary gas of Part III regulates pipeline 51 to enter in blower mill 4 by air quantity.The weary gas of high hygroscopic water is cooled by refrigerant 70 weary air water recover 25 is interior, thereby obtains a large amount of aqueous waters, and aqueous water combines in collecting-tank 27.The cold weary gas that weary air water recovery system 25 is discharged draws 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.
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, the cold weary gas after being cooled 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) 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.
3) do not enter burner hearth from extracting a part of stove cigarette near furnace outlet as drier component and weary gas, and newly-increased one dry hot blast of using in air preheater, can make the cigarette/geomantic omen equivalent proportion in air preheater obviously reduce, thereby air preheater outlet 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.Due to the air preheater outlet flue gas of composition 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 open type powder process steam heating type boiler unit of the present invention significantly reduces compared with existing boiler unit, correspondingly boiler thermal output obviously improves.
4) utilize because be provided with before the air-supply entrance of air preheater the cold wind preheating device that environment cold wind is carried out to preheating from the low-pressure steam of Steam Turbine, make the wind that enters air preheater 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, ensure that cold end corrosion does not occur the metal heated face of air preheater cold-end air thus, thereby ensure air preheater safe operation.Simultaneously, 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, when minimizing due to exhaust gas volumn in air preheater, air quantity uses hot blast obviously to increase because newly-increased one is dried, make the exhaust gas temperature can be very low, therefore need boiler air-supply to be preheated to higher warm braw temperature, to keep air preheater cold-end air metal temperature can make 70～85 DEG C 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, power plant efficiency is further improved.
5) a wind blender is set and can regulates easily air temperature one time, thereby ensure powder feeding safety and breeze airflow combustion stability; Recycle weary tolerance by adjusting and can regulate easily desiccant temperature, thereby ensure the predrying effect of high-temperature flue gas to raw coal in descending drying tube; Regulate pipeline by coal pulverizer air quantity is set, can make coal pulverizer work under optimal ventilation amount, thereby ensure pulverizer capacity and reduce powder process power consumption.
6) by being arranged on the flapper between coal dust maker and air and powder mixer, effectively prevent coal dust and the channelling of air generation air, maintain the coal dust air intake powder mixer that successfully circulates safely thereby realize.Increase the security of this device.
The open type powder process steam heating type boiler unit and the electricity generation system that provide according to the present embodiment one, because cancelled the Pulverized Coal Bin of storage high volatile coal dust, be conducive to simplify flour mill flow and reduce equipment investment and improve pulverized coal preparation system safety in operation.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 air preheater outlet 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 ensure 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 air preheater after steam air heater heating, further heated and obtain hot blast by air preheater, the burner hearth that the Part I of this hot blast enters boiler as Secondary Air is combustion-supporting, the Part II 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, wherein the Part III of this hot blast enters drier mixing chamber as one of drier part.So, compared 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 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.
In addition, taking out mouthful punishment due to the flue gas producing in burner hearth at flue gas is 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 air preheater outlet, therefore the exhaust gas volumn that, enters air preheater obviously reduces.And the drier that enters raw coal pre-drying device can be carried out by weary gas the adjusting of temperature, 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, the water equivalent in air preheater reduces than obviously, and also under identical air preheater hot junction heat transfer temperature difference, air preheater exports exhaust gas temperature can obviously be reduced.Thereby, having benefited from low air preheater outlet exhaust gas temperature 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, some heat from boiler back end ductwork flue gas of the thermal source of the drying capacity of the powder process subsystem of the present embodiment (taking hot blast as heat-carrying agent) also has part of heat energy to come from air preheater and add thermogenetic part hot blast, and these heats are dry for the coal in powder process subsystem.High-temperature flue gas extraction amount is tending towards reducing, and the air capacity of simultaneously flowing through in air preheater obviously increases.Because the temperature of high-temperature flue gas (general approximately 1000 DEG C of left and right) is far above hot blast temperature (general approximately 320 DEG C of left and right), thereby in air preheater the increase amplitude of flue gas flow far below the increase amplitude of air mass flow, result is that the cigarette/geomantic omen equivalent in air preheater can further reduce, and under identical air preheater inlet flue gas temperature and hot blast temperature, air preheater outlet exhaust gas temperature can further reduce.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 DEG C 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.
Choose the middle impact of fume side cold end corrosion on air preheater cold-end air heating surface trouble free service that need to consider at the exhaust gas temperature of coal-fired power station boiler.For corrosion rate is controlled in allowed band, in engineering design, General Requirements makes air preheater cold-end air metal temperature 70～85 DEG C of scopes.Employing utilizes after the powder process subsystem of partial fume as drier chief component, significantly reduces with air preheater outlet exhaust gas temperature, and air preheater cold-end air metal temperature can be too low.For head it off, the wind that enters air preheater in the present embodiment first heats through steam air heater, to improve air preheater cold-end air metal 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 air preheater 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, enable so that air preheater cold-end air metal temperature is unlikely too low, steam air heater outlet wind-warm syndrome is also designed to slightly higher than boiler design cold wind temperature (20 DEG C).In contrast to this, in the present embodiment, steam air heater is normal throwing equipment of the four seasons, and because air preheater outlet 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 ensures metal heated security of operation of air preheater cold-end air, 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 by open type powder process steam heating type boiler electricity generation system that unit forms 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.
To sum up, embodiment mono-can provide a kind of green high-efficient coal generating system, solve the unsettled problem of high-moisture coal-fired boiler combustion, reduce the coal-grinding power consumption of coal pulverizer, overcome the inefficient shortcoming of traditional high-moisture coal-fired boiler hot, in further significantly improving boiler thermal output and unit generation efficiency, solve the security of operation problem of metal heated of air preheater cold-end air, reclaim and flue gas water is reclaimed be easy to Project Realization by the cooling water that carries out that is enriched with weary gas that large quantity of moisture and water dew point temperature are high, recyclable a large amount of liquid condensate water, there is outstanding water and reclaim benefit.
< embodiment bis->
For structure identical with embodiment mono-in embodiment bis-, adopt identical numbering and omit related description.
Fig. 6 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 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, air preheater 34, 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:
Once distinguished and admirable journey: one time wind blower fan 243 extracts cold wind 261 and is 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, the low-pressure steam 270 that wind steam air heater 245 is used to gas bleeder steam mouth heats and obtains warm braw cold wind, and low-pressure steam 270 is cooled to hydrophobic 271 in a steam air heater 245.Warm braw enters into wind bellows 242 as a wind one time by a wind pipeline 240, wind bellows 242 to wind distribute laggard enter air and powder mixer 10 be mixed to get wind powder mixture from the coal dust of machine supplying powder 9, 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 from the low-pressure steam of bleeder steam mouth cold wind is heated and obtains warm braw, this warm braw enters into air preheater 34 by Secondary Air warm braw pipeline 33 and further heats and obtain hot blast, a part for this hot blast enters into secondary air bellow 38 as Secondary Air by Secondary Air hot air duct 37, the burner hearth that is sent to boiler 13 after secondary air bellow 38 the is sent to boiler 13 combustion-supporting secondary air bellow 38 of burner hearth after Secondary Air is distributed distributes Secondary Air is combustion-supporting, another part of this hot blast enters drier mixing chamber as one of drier part.
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.
For ease of regulating drier initial temperature, the open type powder process steam heating type boiler unit in above-described embodiment one and embodiment bis-is provided with recycling exhaust steam pipe 23.But be pointed out that, because hot blast temperature is lower than common drier initial temperature, therefore the present invention also can cancel recycling exhaust steam pipe 23, by regulating the dry adjusting that also can realize desiccant temperature with the flow of hot blast, but from the angle of open type powder process steam heating type boiler unit safety and economic operation, regulating dry can affect exhaust gas temperature and then affect boiler thermal output and air preheater cold-end air cold end corrosion with hot air flow, nor it is flexible to recycle weary gas as regulated.In addition, the present invention can also cancel recycling exhaust steam pipe 23, also can be by regulating pulverized coal preparation system inleakage to realize the adjusting of desiccant temperature, but the increase of pulverized coal preparation system inleakage can make open type powder process steam heating type boiler generatine set heat efficiency reduce, also can make drier oxygen content increase and then increase pulverized coal preparation system Explosion-proof Design difficulty, also can make weary gas water capacity reduce.In addition, the present invention can also cancel recycling exhaust steam pipe 23, thereby also can be extracted a part of cold smoke and realize to mixing chamber 20 by cold smoke blower fan the adjusting of desiccant temperature from boiler induced-draft fan exhaust pass.But compared with recycling exhaust steam, this method need be set up cold smoke blower fan, and cold smoke pipeline is also longer, and weary gas water capacity is also relatively low, and drier thermoregulation effect is close.Thereby, though the drier in the present invention is to contain the weary gas of recirculation as example, also comprise above-mentioned to recycling cancellation scheme or the replacement scheme of weary gas simultaneously.
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: weighing coal feeder, raw coal pre-drying device, gas powder generating apparatus, coal collector, the flapper 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 the air preheater of described flue afterbody, the cold wind preheating device that is connected with described air preheater 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,
Control is measured and regulated to the described weighing coal feeder pair raw coal weight corresponding with the boiler coal feeding amount of sending into described burner hearth,
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 separates and obtains coal dust and weary gas described primary mixture,
Described flapper is used for preventing described coal dust generation air channelling and maintains described coal dust circulating smoothly,
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 environment cold wind,
Described air preheater further heats and obtains hot blast described warm braw, after the Part I of described hot blast mixes in a described wind mixing chamber with described environment cold wind as a described wind, the Part II of described hot blast is directly sent into described coal burner as Secondary Air, the Part III of described hot blast is directly sent into described drier mixing chamber
A described wind and described coal dust are mixed to get described wind powder mixture by described air and powder mixer,
Described weary air water retracting device is introduced weary the Part I of described weary gas gas and the moisture in weary this Part I gas is reclaimed,
Described drier mixing chamber is taken out mouthful with described flue gas respectively, the gas vent of described coal collector is connected, using the weary gas of Part II in described weary gas, take out mouthful part for described flue gas extracting and the Part III of described hot blast 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 described air preheater.
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, 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 and supplement adjusting and enter the air quantity of described gas powder generating apparatus for described weary gas export to the weary pneumatic transmission of Part III of 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: weighing coal feeder, raw coal pre-drying device, gas powder generating apparatus, coal collector, flapper, the air and powder mixer 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, the second cold wind preheating device that is positioned at the air preheater of described flue afterbody and is connected with described air preheater,
Described weary air water reclaims subsystem and comprises: the weary air water retracting device being connected with the gas vent of described coal collector,
Control is measured and regulated to the described weighing coal feeder pair raw coal weight corresponding with the boiler coal feeding amount of sending into described burner hearth,
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 separates and obtains coal dust and weary gas described primary mixture,
Described flapper is used for preventing described coal dust generation air channelling and maintains described coal dust circulating smoothly,
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, and 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 a part for the described air preheater hot blast that further heating generates afterwards as Secondary Air,
A described wind and described coal dust are mixed to get wind powder mixture by described air and powder mixer, and described Secondary Air directly enters described coal burner,
The moisture in weary gas is introduced and reclaimed to described weary air water retracting device by a part for described weary gas,
Described drier mixing chamber also takes out mouthful with described flue gas respectively and the gas vent of described coal collector is connected, and described drier mixing chamber is using the weary gas of Part II in described weary gas, take out the part for described flue gas of mouth extraction and another part of described hot blast 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 a described wind is introduced to the warm braw pipeline of 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 described air preheater.
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, 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 and supplement adjusting and enter the air quantity of described gas powder generating apparatus for described weary gas export to the weary pneumatic transmission of Part III of the described weary gas of sending.
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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| CN104373950A (en) * | 2014-11-13 | 2015-02-25 | 上海理工大学 | Superheated steam drying powder making type coal-fired power generation system |
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| CN104373950A (en) * | 2014-11-13 | 2015-02-25 | 上海理工大学 | Superheated steam drying powder making type coal-fired power generation system |
| CN104456598A (en) * | 2014-11-13 | 2015-03-25 | 上海理工大学 | Superheated steam drying coal-pulverizing system |
| CN104373950B (en) * | 2014-11-13 | 2016-09-14 | 上海理工大学 | Superheat steam drying powder process type coal generating system |
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