CN104165373A - Exhaust warm air type boiler unit for open coal pulverization - Google Patents
Exhaust warm air type boiler unit for open coal pulverization Download PDFInfo
- Publication number
- CN104165373A CN104165373A CN201410407191.3A CN201410407191A CN104165373A CN 104165373 A CN104165373 A CN 104165373A CN 201410407191 A CN201410407191 A CN 201410407191A CN 104165373 A CN104165373 A CN 104165373A
- Authority
- CN
- China
- Prior art keywords
- air
- gas
- weary
- coal
- powder
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Landscapes
- Air Supply (AREA)
- Drying Of Solid Materials (AREA)
Abstract
The invention provides an exhaust warm air type boiler unit for open coal pulverization. The boiler unit is used for burning raw coal and is characterized in that a drying agent mixing chamber is connected with a smoke extracting opening and a gas outlet of the pulverized coal collector respectively, the first part of exhaust air extracted from the exhaust air and a part of the smoke extracted from the smoke extracting opening are mixed to be used as a drying agent which is sent into a raw coal pre-drying device, a cold air exhaust-air preheating device is used for preheating environment cold air through an exhaust warm air device to obtain warm air, a part of the warm air is further heated by an air preheater to obtain hot air, a part of the hot air and the other part of the warm air are mixed to be used as primary air, an air-pulverized-coal mixer mixes the primary air and pulverized coal to obtain air-pulverized-coal mixture, and the other part of the hot air is used as secondary air to be directly sent into a pulverized coal burner.
Description
Technical field
The weary gas heating type of the open powder process boiler unit that the present invention relates to a kind of coal fired power plant, is 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.
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
The present invention carries out in order to address the above problem, and object 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 the weary gas heating type of the open powder process boiler unit of high efficiency generating.
The invention provides the weary gas heating type of a kind of open powder process boiler unit, for raw coal is burnt, there is such feature, 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, be positioned at the air preheater and the weary gas preheating device of the cold wind being connected with air preheater of flue afterbody, 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, drier mixing chamber is taken out mouth with flue gas respectively and is connected with the gas vent of coal collector, after mixing with a part for flue gas, the weary gas of the first in weary gas delivers to raw coal pre-drying device as drier, weary air water retracting device is introduced the weary gas of the second portion in weary gas the moisture in the weary gas of this second portion is reclaimed, comprise: the blast pipe road that is connected weary gas is carried with the gas vent of coal collector, the weary air water recover being connected with blast pipe road, store the collecting-tank of weary air water, and the weary hot air heating wind device that is positioned at the entrance side of weary air water recover, the weary gas preheating device of cold wind comprises: the pressure fan that environment cold air is provided, environment cold wind is sent into the air supply duct in weary hot air heating wind device, the warm braw forming after weary gas waste heat preheating in the weary hot air heating wind of environment Quilt with air conditioning device is sent to respectively to the weary gas economizer bank of air preheater and air and powder mixer, air preheater adds thermosetting hot blast to a part for warm braw, a part for hot blast is directly sent into coal burner as Secondary Air, after another part of hot blast mixes with another part of warm braw as a wind, air and powder mixer is mixed to get wind powder mixture by wind and coal dust, drier mixing chamber is sent into raw coal pre-drying device the weary gas of the first of weary gas is mixed with a part of taking out the flue gas of mouth extraction from flue gas.
In the weary gas heating type of open powder process provided by the invention boiler unit, there is such feature, also comprise: gas cleaning subsystem, comprise: the deduster being connected with air preheater, air-introduced machine, boiler exhaust gas pipeline, flue gas desulfur device and chimney, the outlet of air-introduced machine is connected with the import of flue gas desulfur device by boiler exhaust gas pipeline, and flue gas desulfur device outlet is connected with chimney.
In the weary gas heating type of open powder process provided by the invention boiler unit, 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.
Effect and the effect of invention
In the weary gas heating type of open powder process of the present invention boiler unit, because coal collector make coal dust and weary gas separated at coal collector, and in weary gas, be enriched with in a large amount of steam and heat and weary gas 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, usining near the flue gas of the high temperature that extracts furnace outlet and the weary gas of recirculation mixes afterwards 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.Utilizing weary gas waste heat is that air carries out preheating to environment cold air, make the air that enters air preheater first in the weary gas preheating device of cold wind, obtain preheating to a certain extent, when improving boiler thermal output thus, guarantee that cold end corrosion does not occur the metal heated face of air preheater cold-end air, thereby guarantee air preheater safe operation.
And, using the flue gas of high temperature and the mixture of the weary gas of recirculation as powder process subsystem drier, make the oxygen content of drier compare obviously less 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, a part for 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.
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 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, but the amplitude that in air preheater, exhaust gas volumn reduces is by contrast larger, thereby, synthesis result is that cigarette/geomantic omen equivalent proportion of air preheater obviously reduces, and is also 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.Owing to forming the air preheater outlet flue gas of 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.
Therefore, the present invention can provide a kind of not only realize the moisture in weary gas to reclaim and recycle also can realize the heat in weary gas is further utilized, can also realize the weary gas heating type of the open powder process boiler unit that generating efficiency is higher.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of electricity generation system in the embodiment of the present invention;
Fig. 2 is the structured flowchart of the weary gas heating type of open powder process boiler unit in the embodiment of the present invention;
Fig. 3 is the construction module schematic diagram of the weary gas heating type of open powder process boiler unit in the embodiment of the present invention;
Fig. 4 is the block diagram of the air-supply powder feeding subsystem of the weary gas heating type of open powder process boiler unit in the embodiment of the present invention; And
Fig. 5 is the structural representation of the weary gas heating type of open powder process boiler unit in the embodiment of the present invention.
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 specifically addressed the weary gas heating type of open powder process of the present invention boiler unit by reference to the accompanying drawings.
< embodiment >
Fig. 1 is the structured flowchart of electricity generation system in the embodiment of the present invention.
As shown in Figure 1, electricity generation system 100 comprises: the weary gas heating type of open powder process boiler unit 501, Steam Turbine 502 and generating set 503.
The heat heating water that raw coal produces in 501 burnings of the weary gas heating type of open powder process 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 weary gas heating type of open powder process boiler unit in the embodiment of the present invention.
As shown in Figure 2, the weary gas heating type of open powder process boiler unit 501 is for raw coal 60 is heated, and the weary gas heating type of open powder process 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 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 weary gas heating type of open powder process boiler unit in the embodiment of the present invention.
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, drier mixing chamber 20, drier pipeline 21 and air quantity regulate pipeline 51.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, and the other end is connected with the import of gas powder generating apparatus, 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, weary gas preheating pipe 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.Here, pressure fan 29, air supply duct 30, weary gas preheating pipe 33, Secondary Air hot air duct 37, secondary air bellow 38 have formed the weary gas preheating device of cold wind.
Weary air water reclaims subsystem 404 and comprises: weary gas blower fan 22, blast pipe road 24, weary air water recover 25, weary gas bypass duct 26, collecting-tank 27, cold blast pipe road 28 and weary hot air heating wind device 31.
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 the weary gas heating type of open powder process 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 and are 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.Air preheater 34 is positioned at the afterbody of the flue of boiler 13.
Pressure fan 29 outlets are connected by air supply duct 30 with the air side entrance of weary hot air heating wind part 31, the air side outlet of weary hot air heating wind device 31 is connected with weary gas preheating pipe 33, and weary gas preheating pipe 33 contains two outlets and is connected with the air side import of air preheater 34 and the air inlet of a wind mixing chamber 39 respectively.
The air side outlet of air preheater 34 is connected with secondary air bellow 38 imports by Secondary Air hot air duct 37, and the hot blast import by a wind-heat wind pipeline 36 and a wind blender 39 is connected, 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, and 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 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, moisture in the weary gas that storage is reclaimed by weary air water recover 25, cold weary gas after the moisture reclaiming in weary gas through weary air water recover 25 is discharged to boiler exhaust gas pipeline 16 through cold blast pipe road 28, weary hot air heating wind device 31 is positioned at weary air water recover 25 near weary gas inlet side, make environment cold wind 61 absorb more fully the heat in weary gas.
Deduster 14 imports are connected with the fume side outlet of air preheater 34, 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.
The flow process of air: as shown in Figure 3, Figure 4, environment cold wind 61 (air) is sent in weary hot air heating wind device 31 through air supply duct 30 by pressure fan 29, in weary hot air heating wind device 31 by weary gas waste-heat, make the preheated warm braw that obtains uniform temperature of environment cold wind 61, warm braw is admitted to respectively in air preheater 34 and a wind mixing chamber 39 by weary gas economizer bank 33, after the further heating part warm braw of air preheater 34, obtains hot blast.The hot blast major part of air preheater 34 air side outlets 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, be mixed to by a certain percentage coal dust safe transport and the required warm air temperature of smooth combustion with other part warm braw, 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 weary gas heating type of open powder process boiler unit in the embodiment of the present invention.
As shown in Figure 5, open the operation principle of the weary gas heating type of powder process 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 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 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: after taking out mouthfuls 19 high-temperature flue gas that extract and weary gas from recycling blast pipe road 23 mixes in drier mixing chamber 20 by flue gas, 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 three tunnels, the first via is sent into drier mixing chamber 20 as drier temperature control medium by recycling blast pipe road 23, weary air water recover 25 is sent on the second tunnel through blast pipe road 24, Third Road regulates pipeline 51 to enter blower mill 4 through air quantity.The weary gas of high hygroscopic water is cooled by refrigerant 80 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 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 the weary gas mixing of high-temperature flue gas and recirculation as drier, can obviously reduce drier oxygen content, thereby improve pulverized coal preparation system safety in operation; And, using the weary gas mixing of high-temperature flue gas and recirculation as drier, 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, can make the cigarette/geomantic omen equivalent proportion in air preheater reduce, thereby air preheater outlet exhaust gas temperature is 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 air preheater outlet flue gas of open weary gas 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 the open weary gas 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 and utilize weary hot air heating wind device to carry out preheating to environment cold wind before the air-supply entrance of air preheater, can when thereby boiler adopts lower exhaust gas temperature to improve boiler thermal output, guarantee that cold end corrosion does not occur the metal heated face of air preheater cold-end air thus, thereby guarantee air preheater safe operation.
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 descending drying tube; 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 weary gas heating type of the open powder process boiler unit providing according to the present embodiment, because be provided with coal collector at outlet of coarse powder separating device, makes coal dust and weary gas separated at coal collector, and coal dust is sent into stove chamber inner combustion by a wind.The environment cold wind that pressure fan provides on the one hand carries out cooling to weary gas as cooling medium, thereby realize the recovery of portion of water in weary gas, and then alleviates the heat radiation task that weary air water recovery system need be born; On the other hand, utilize weary gas preboiler air-supply that weary gas waste heat is recovered and be used in steam generator system, having reduced in other words the weary temperature degree that steam generator system discharges is the weary temperature degree of weary hot air heating wind device outlet), thus boiler exhaust gas heat loss reduced, improved boiler thermal output; Finally, after weary gas preboiler air-supply, improve the wind-warm syndrome that enters air preheater, thereby alleviated air preheater cold-end air cold end corrosion, guaranteed the safe and reliable work of air preheater.
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.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.
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 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 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, 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 boiler unit in embodiment can make boiler exhaust gas heat loss significantly reduce, and boiler thermal output obviously improves.
At the exhaust gas temperature of coal-fired power station boiler, 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.For corrosion rate is controlled in allowed band, in engineering design, General Requirements can make lower 70 ℃～85 ℃ of corrosion rate by air preheater cold-end air metal temperature.Employing utilizes after the powder process subsystem of partial fume as drier chief component, with air preheater outlet exhaust gas temperature, significantly reduces, 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 weary hot air heating chamber, to improve air preheater cold-end air metal temperature, thereby can meet engineering design requirement.
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.For the wet method fume desulfurizing system of Thermal Power Generation Industry extensive use, need in flue gas desulfur device, expend large water gaging desulfurization, owing to having adopted cold weary gas to after the cooling of boiler exhaust gas in the present embodiment, enter again flue gas desulfur device desulfurization, the flue gas cool-down water consumption that can obviously reduce desulphurization system, this makes the present embodiment electricity generation system have appreciable water-saving benefit.
In addition, 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 is different, and the present embodiment is the drier of usining after the part of the inner flue gas producing of boiler unit itself and the weary gas mixing of recirculation as powder process subsystem.Visible, in the powder process subsystem of the present embodiment, drier heat only comes from flue gas, recycles weary gas and has played the effect of coordinating 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 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 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 metal heated of air preheater cold-end air, 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.
Certainly open weary gas heating type boiler unit 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 (3)
1. open the weary gas heating type of a powder process boiler unit, for raw coal is burnt, it 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, be positioned at the air preheater and the weary gas preheating device of the cold wind being connected with described air preheater of described flue afterbody,
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,
Described drier mixing chamber is taken out mouth with described flue gas respectively and is connected with the gas vent of described coal collector, after the weary gas of first in described weary gas mixes with a part for described flue gas, as described drier, delivers to described raw coal pre-drying device,
Described weary air water retracting device is introduced the weary gas of the second portion in described weary gas the moisture in the weary gas of this second portion is reclaimed, comprise: the blast pipe road that described weary gas is carried that is connected with the gas vent of described coal collector, the weary air water recover being connected with described blast pipe road, store the collecting-tank of described weary air water, and the weary hot air heating wind device that is positioned at the entrance side of described weary air water recover
The weary gas preheating device of described cold wind comprises: provide environment cold air pressure fan, described environment cold wind is sent into air supply duct in described weary hot air heating wind device, the warm braw forming after the weary gas waste heat preheating in weary hot air heating wind device described in described environment Quilt with air conditioning is sent to respectively to the weary gas economizer bank of described air preheater and described air and powder mixer
Described air preheater adds thermosetting hot blast to a part for described warm braw, and a part for described hot blast is directly sent into described coal burner as Secondary Air, after another part of described hot blast mixes with another part of described warm braw as a described wind,
Described air and powder mixer is mixed to get described wind powder mixture by a described wind and described coal dust,
Described drier mixing chamber is sent into described raw coal pre-drying device the weary gas of described first is mixed with a part of taking out the described flue gas of mouth extraction from described flue gas.
2. according to the weary gas heating type of the open powder process boiler unit described in claim 1, it is characterized in that, also comprise:
Gas cleaning subsystem, comprises: the deduster being connected with described air preheater, air-introduced machine, boiler exhaust gas pipeline, flue gas desulfur device and chimney,
The outlet of described air-introduced machine is connected with the import of described flue gas desulfur device by described boiler exhaust gas pipeline, and described flue gas desulfur device outlet is connected with described chimney.
3. according to the weary gas heating type of the open powder process boiler unit described in any one in claim 1 to 2, 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410407191.3A CN104165373B (en) | 2014-08-19 | 2014-08-19 | The open weary gas heating type boiler controller system of powder process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410407191.3A CN104165373B (en) | 2014-08-19 | 2014-08-19 | The open weary gas heating type boiler controller system of powder process |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104165373A true CN104165373A (en) | 2014-11-26 |
| CN104165373B CN104165373B (en) | 2016-06-08 |
Family
ID=51909302
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410407191.3A Expired - Fee Related CN104165373B (en) | 2014-08-19 | 2014-08-19 | The open weary gas heating type boiler controller system of powder process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104165373B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106599563A (en) * | 2016-12-07 | 2017-04-26 | 华北电力科学研究院有限责任公司 | Verification method and apparatus for powder manufacturing equipment |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101761933A (en) * | 2010-01-15 | 2010-06-30 | 西安热工研究院有限公司 | Low-temperature furnace smoke sucking exhaust gas and hot air drying composite powder feeding bituminous coal and meagre coal universal type powder preparing system |
| JP2012083031A (en) * | 2010-10-12 | 2012-04-26 | Tsukishima Kikai Co Ltd | Coal drying device and method |
| CN202229208U (en) * | 2011-05-27 | 2012-05-23 | 中国电力工程顾问集团东北电力设计院 | Furnace smoke drying and water recycling warehouse-type fan mill hot air powder supplying and making system |
| CN102798134A (en) * | 2011-05-27 | 2012-11-28 | 中国电力工程顾问集团东北电力设计院 | Furnace smoke drying and water recycling warehouse-type fan mill hot air powder supplying and making system |
| CN102840593A (en) * | 2011-06-20 | 2012-12-26 | 上海机易电站设备有限公司 | Fume dried lignite medium speed mill powder-making system |
| CN102889606A (en) * | 2011-07-20 | 2013-01-23 | 上海机易电站设备有限公司 | Direct fired pulverizing system of smoke pre-drying lignite steel ball mill |
| CN203116491U (en) * | 2013-03-18 | 2013-08-07 | 施大钟 | Lignite water take-out lignite efficient burning system |
-
2014
- 2014-08-19 CN CN201410407191.3A patent/CN104165373B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101761933A (en) * | 2010-01-15 | 2010-06-30 | 西安热工研究院有限公司 | Low-temperature furnace smoke sucking exhaust gas and hot air drying composite powder feeding bituminous coal and meagre coal universal type powder preparing system |
| JP2012083031A (en) * | 2010-10-12 | 2012-04-26 | Tsukishima Kikai Co Ltd | Coal drying device and method |
| CN202229208U (en) * | 2011-05-27 | 2012-05-23 | 中国电力工程顾问集团东北电力设计院 | Furnace smoke drying and water recycling warehouse-type fan mill hot air powder supplying and making system |
| CN102798134A (en) * | 2011-05-27 | 2012-11-28 | 中国电力工程顾问集团东北电力设计院 | Furnace smoke drying and water recycling warehouse-type fan mill hot air powder supplying and making system |
| CN102840593A (en) * | 2011-06-20 | 2012-12-26 | 上海机易电站设备有限公司 | Fume dried lignite medium speed mill powder-making system |
| CN102889606A (en) * | 2011-07-20 | 2013-01-23 | 上海机易电站设备有限公司 | Direct fired pulverizing system of smoke pre-drying lignite steel ball mill |
| CN203116491U (en) * | 2013-03-18 | 2013-08-07 | 施大钟 | Lignite water take-out lignite efficient burning system |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106599563A (en) * | 2016-12-07 | 2017-04-26 | 华北电力科学研究院有限责任公司 | Verification method and apparatus for powder manufacturing equipment |
| CN106599563B (en) * | 2016-12-07 | 2019-01-25 | 华北电力科学研究院有限责任公司 | A kind of powder manufacturing apparatus method of calibration and device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104165373B (en) | 2016-06-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN204240348U (en) | Superheat steam drying powder process type coal-burning boiler unit and electricity generation system | |
| CN104197362B (en) | With the furnace smoke drying enclosed powder process coal-burning boiler unit that weary air water reclaims | |
| CN104132362A (en) | Open powder making steam warm air type boiler unit and power generation system thereof | |
| CN104132363A (en) | Open powder making steam warm air type boiler unit and power generation system thereof | |
| CN104132359A (en) | Open powder making steam warm air type boiler unit and power generation system thereof | |
| CN204240347U (en) | Superheat steam drying powder process type coal generating system | |
| CN104132364A (en) | Open powder making steam warm air type boiler unit and power generation system thereof | |
| CN104132361A (en) | Open powder making steam warm air type boiler unit and power generation system thereof | |
| CN104359107A (en) | Superheated steam drying powder making type coal-fired boiler machine unit | |
| CN204114984U (en) | With the stove cigarette dry enclosed powder process coal-burning boiler unit that weary air water reclaims | |
| CN104329667A (en) | Superheated steam drying power-making coal-fired power generation system | |
| CN204240386U (en) | Superheat steam drying powder process type coal generating system | |
| CN104132360A (en) | Open powder making steam warm air type boiler unit and power generation system thereof | |
| CN104165373B (en) | The open weary gas heating type boiler controller system of powder process | |
| CN204114982U (en) | With the weary air dry enclosed powder process coal-burning boiler unit of stove cigarette heat that weary air water reclaims | |
| CN204114983U (en) | With the stove cigarette heated-air drying enclosed powder process coal-burning boiler unit that weary air water reclaims | |
| CN104165371B (en) | The open weary gas heating type boiler controller system of powder process | |
| CN104329666A (en) | Coal-fired power generation system capable of drying superheated steam into powder | |
| CN104197360B (en) | With the furnace smoke drying enclosed powder process coal-burning boiler unit that weary air water reclaims | |
| CN204739580U (en) | Superheated steam drying powder process type coal fired boiler unit and power generation system | |
| CN204240385U (en) | Superheat steam drying powder process type coal generating system | |
| CN204240389U (en) | Superheat steam drying powder process type coal generating system | |
| CN204240390U (en) | Superheat steam drying powder process type coal generating system | |
| CN104165372A (en) | Exhaust warm air type boiler unit for open coal pulverization | |
| CN204240382U (en) | Superheat steam drying powder process type coal generating system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| CB03 | Change of inventor or designer information |
Inventor after: Ma Youfu Inventor after: Pei Yufeng Inventor after: Shi Dazhong Inventor after: Shi Dengyu Inventor before: Ma Youfu |
|
| COR | Change of bibliographic data | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20160411 Address after: 200093 Shanghai military road, Yangpu District, No. 516 Applicant after: University of Shanghai for Science and Technology Applicant after: Co., Ltd of Northeastern Electric Power Design Institute, China Power Engineering Consulting Group Corporation Applicant after: Shanghai Electric Power Generation Equipment Co., Ltd. Address before: 200093 Shanghai military road, Yangpu District, No. 516 Applicant before: University of Shanghai for Science and Technology |
|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160608 Termination date: 20190819 |