CN204114983U - With the stove cigarette heated-air drying enclosed powder process coal-burning boiler unit that weary air water reclaims - Google Patents

With the stove cigarette heated-air drying enclosed powder process coal-burning boiler unit that weary air water reclaims Download PDF

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CN204114983U
CN204114983U CN201420532128.8U CN201420532128U CN204114983U CN 204114983 U CN204114983 U CN 204114983U CN 201420532128 U CN201420532128 U CN 201420532128U CN 204114983 U CN204114983 U CN 204114983U
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weary
air
gas
coal
powder
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马有福
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University of Shanghai for Science and Technology
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University of Shanghai for Science and Technology
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00Combustion technologies with mitigation potential
    • Y02E20/34Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery

Abstract

The utility model provides a kind of stove cigarette heated-air drying enclosed powder process coal-burning boiler unit reclaimed with weary air water, for burning to raw coal, it is characterized in that, comprise: the weary air preheater of air carries out heating to environment cold wind and obtains hot blast, Part I hot blast in hot blast directly sends into coal burner as Secondary Air, Part II hot blast in hot blast is directly sent into drier mixing chamber and is sent in raw coal pre-drying device as drier with taking out from flue gas after flue gas that mouth extracts mixes, drier mixing chamber takes out mouth with flue gas respectively, the weary air preheater of air is connected, weary air water retracting device cools to the height that powder process subsystem is discharged containing wet weary gas thus obtains a large amount of condensate water and discharge cold weary gas, a cold weary gas part is added the weary gas of thermosetting heat by the weary air preheater of air, the weary gas of heat mixes with the another part in cold weary gas and enters air and powder mixer as First air and coal dust carries out being mixed to get wind powder mixture.

Description

With the stove cigarette heated-air drying enclosed powder process coal-burning boiler unit that weary air water reclaims
Technical field
The utility model relates to a kind of stove cigarette heated-air drying enclosed powder process coal-burning boiler unit reclaimed with weary air water of coal fired power plant, is specifically related to boiler air-supply, 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.World's coal gross reserves 40% is accounted 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 being positioned at Xinjiang of China In The Eastern Junggar Basin " accurate eastern coalfield " reach 3,900 hundred million tons, are the maximum self-contained coalfields of China.Accurate eastern coal is except caloric value comparatively 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.
Utilizing level for improving brown coal, having carried out the brown coal drying technical research of various ways both at home and abroad.It is predrying that steam condensation used heat is used for brown coal by the draw gas predrying technology integrated with thermal power plant, power plant efficiency 2 ~ 4 percentage points can be improved in theory, but no matter steam pipe roller drier or in heating steam fluidized-bed process, it is the wall-type heat exchange that heat transfer intensity is lower between coal grain and steam, 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, be the mixing heat-exchange that heat transfer intensity is higher between coal grain and flue gas (or hot-air), but the safety in operation of flue gas (or hot-air) drying is poor, drying system easily catches fire, and needs strict control desiccant temperature and oxygen content.Mechanical/thermal press-dehydrating and Thermal dehydration are non-evaporation drying technology, advantage is that energy consumption for drying is low and can remove a part of alkali species thus improve boiler scaling and contamination, but dehydration conditions is HTHP, and equipment enlarging is more difficult, and the intractability of dewatering system waste discharge is larger.Due to the easy cracked easy spontaneous combustion of brown coal, after dry, the shaping and safe storage transport of brown coal is also comparatively difficult.Visible, all there is distinctive difficulty in current all kinds of brown coal drying technology, still needs research further with perfect before scale application.
Brown coal moisture is high, calorific value is low and easily spontaneous combustion, therefore unsuitable long distance transportation.The main path that current brown coal utilize is still by electric power stations near coal-mines combustion power generation, then transmits electric power to the area needed.And the installed capacity of Chinese large-sized combustion brown coal generating set (single-machine capacity >=200MW) only accounts for about 3% of national thermoelectricity total installation of generating capacity, far below the ratio (16%) that brown coal are shared in coal gross reserves.So along with the ratio of High Quality Tobacco coal reserves constantly declines, development lignite-fired unit is significant to China's Sustainable Development of Power Industry.
China at present existing multiple stage 600MW level lignite-fired unit puts into operation, all configuration unit pulverized-coal system boiler.But compared with conventional bituminous coal fired boiler, the thermal efficiency lower (about low 2 percentage points) of these boiler using brown coals and price is higher, this main because of the inner flue gas of the stove amount in boiler using brown coal comparatively greatly, thus 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 gas such as a large amount of stove cigarette and steam in First air, 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 (such as Eastern Inner Mongolia) belongs to areas of serious mostly, and water resources shortage becomes the important restriction factor affecting near coal-mine power supply construction of base.Obviously, contain in the flue gas of high-moisture coal-burning boiler and have great lot of water resources, realizing the recycling of moisture in coal-fired flue-gas becomes a problem demanding prompt solution.
Utility model content
The utility model carries out to solve the problem, object is to provide a kind of can not only realization to recycle the large quantity of moisture in milling waste steam processed, and can also realize the stove cigarette heated-air drying enclosed powder process coal-burning boiler unit reclaimed with weary air water of high efficiency generating.
The utility model provides a kind of stove cigarette heated-air drying enclosed powder process coal-burning boiler unit reclaimed with weary air water, it is characterized in that, comprise: powder process subsystem, boiler body subsystem, air-supply powder feeding subsystem and weary air water reclaim subsystem, wherein, powder process subsystem comprises: the raw coal pre-drying device connected in turn, gas powder generating apparatus, coal collector, Pulverized Coal Bin, machine supplying powder and the drier mixing chamber be connected with raw coal pre-drying device, boiler body subsystem comprises: the boiler being provided with burner hearth, the flue be connected with the afterbody of burner hearth, flue gas near the coal burner being positioned at burner hearth entry position and the exhanst gas outlet being positioned at burner hearth takes out mouth, air-supply powder feeding subsystem comprises: air and powder mixer, be positioned at the weary air preheater of air of flue afterbody, for providing the pressure fan of environment cold wind, cold weary gas blower fan and hot blast pipe road, weary air water reclaims subsystem and comprises: the weary air water retracting device be connected with the gas vent of coal collector, raw coal pre-drying device utilizes the drier from drier mixing chamber to carry out predrying to raw coal, gas powder generating apparatus to the raw coal after predrying grind with further drying after obtain primary mixture, coal collector carries out separation to primary mixture and obtains coal dust and weary gas, Pulverized Coal Bin stores coal dust, machine supplying powder flows to the boiler coal feeding amount of air and powder mixer for measuring also regulable control, air and powder mixer is mixed to get wind powder mixture to from the First air of 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, weary for Part I in weary gas gas is introduced and is reclaimed by the moisture in weary for this Part I gas by weary air water retracting device, the weary gas of Part I obtains cold weary gas after the condensation of weary air water retracting device, the weary air preheater of air carries out heating to environment cold wind and obtains hot blast, Part I hot blast in hot blast directly sends into coal burner as Secondary Air, Part II hot blast in hot blast directly sends into drier mixing chamber, cold weary gas blower fan obtains hot weary gas by carrying out preheating in the weary air preheater of a part for cold weary gas introducing air, another part of the weary gas of heat and cold weary gas sends into air and powder mixer as First air through hot blast pipe road, drier mixing chamber takes out mouth with flue gas respectively, the weary air preheater of air is connected, raw coal pre-drying device is sent into as drier after the flue gas and Part II hot blast of taking out mouth extraction from flue gas mix.
In the stove cigarette heated-air drying enclosed powder process coal-burning boiler unit reclaimed with weary air water that the utility model provides, there is such feature, also comprise: gas cleaning subsystem, comprise: the deduster be connected with the weary air preheater of air, 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 stove cigarette heated-air drying enclosed powder process coal-burning boiler unit reclaimed with weary air water that the utility model provides, can also have such feature: wherein, weary air water retracting device comprises: be connected with the gas vent of coal collector for the blast pipe road carried weary gas, the weary air water recover be connected with blast pipe road and the collecting-tank storing weary air water.
In the stove cigarette heated-air drying enclosed powder process coal-burning boiler unit reclaimed with weary air water that the utility model provides, such feature can also be had: wherein, powder process subsystem also comprises one end and exports with the weary gas of coal collector and be connected, the recirculation blast pipe road that the other end is connected with the import of drier mixing chamber, recirculation blast pipe road is used for the weary pneumatic transmission of Part II that weary gas exports in the weary gas sent to enter drier mixing chamber, and the weary gas of Part II and drier are mixed for the temperature regulating drier.
In the stove cigarette heated-air drying enclosed powder process coal-burning boiler unit reclaimed with weary air water that the utility model provides, such feature can also be had: wherein, powder process subsystem also comprises one end and exports with the weary gas of coal collector and be connected, the air quantity that the other end is connected with the import of gas powder generating apparatus regulates pipeline, enters gas powder generating apparatus supplement the air quantity regulating and enter gas powder generating apparatus for the weary pneumatic transmission of Part III exported by weary gas in the weary gas sent.
The effect of utility model and effect
The stove cigarette heated-air drying enclosed powder process coal-burning boiler unit reclaimed with weary air water involved by the utility model, because coal collector make coal dust and weary gas separated at coal collector, and be enriched with a large amount of steam in weary gas and in weary gas steam volume share much larger than steam volume share in boiler exhaust gas, steam volume share height and water dew point high, so substantially increase by weary gas lowered temperature reclamation condensate water the exploitativeness that moisture in flue gas reclaims.Because height has reclaimed a large amount of water resources containing condensation after wet weary gas cooling, " zero water consumption " coal-burning power plant is made to become possibility.
And, the weary gas formed in powder process subsystem obtains cold weary gas reclaimed the steam in weary gas by weary air water retracting device after, the cold weary gas of part is delivered to the heating of air weary air preheater by cold weary gas blower fan and is obtained hot weary gas, the weary gas of heat and the cold weary gas of another part are mixed to get First air by hot blast pipe road, this First air oxygen content is low, coal dust can be avoided in powder feeding pipes combustion, thus carry high volatile coal dust to coal burner safely.Meanwhile, this hypoxic First air can adopt higher powder feeding temperature, thus significantly improves the combustion stability of breeze airflow.And after adopting powder process subsystem, the burner hearth flame temperature of boiler can increase, and further enhances catching fire and after-flame performance of breeze airflow.
Further, because have employed enclosed powder process, namely weary gas melts down and participates in burning, makes the volatile matter also abundant after-flame in stove that may contain in weary gas, thus ensure that the efficiency of combustion of raw coal.And, because the volatile matter may separated out in pulverizing process to enter in stove and after-flame with First air, so need not strictly control the outlet temperature of coal pulverizer in order to avoid Volatile in lower value in enclosed powder process unit, pulverizer outlet temperature can appropriateness improve, this significantly reduces the requirement to pulverized coal preparation system Operation and control on the one hand, reducing because coal dust moisture raises with pulverizer outlet temperature on the other hand makes more moisture in coal be evaporated in weary gas, thus further increases the water yield reclaimed from weary gas.
And, because the major part evaporating moisture in coal from powder process subsystem no longer enters burner hearth after weary air water retracting device, and the cold smoke to be extracted by boiler induced-draft fan exhaust pass is no longer at boiler Inner eycle, the exhaust gas volumn flowing through back-end ductwork and the weary air preheater of air in boiler is obviously reduced, result is that the cigarette/geomantic omen equivalent proportion of the weary air preheater of air reduces, and namely air weary air preheater outlet exhaust gas temperature reduces.In addition boiler exhaust gas amount also reduces because a part of steam is recovered in weary air water retracting device, and thus boiler exhaust gas heat loss reduces, the corresponding raising of boiler thermal output.Further, using the flue gas of high temperature, the drier of mixture as pulverized coal preparation system recycling weary gas and Part II hot blast, high-temperature flue gas extraction amount is reduced, in the weary air preheater of air, cold medium caloric receptivity increases simultaneously, result is that the cigarette in the weary air preheater of air/geomantic omen equivalent proportion is reduced further, and therefore boiler thermal output can further improve.
Therefore, the utility model can provide a kind of and not only realizes reclaiming the moisture in weary gas and recycling realizing boiler thermal output and the higher stove cigarette heated-air drying enclosed powder process coal-burning boiler unit reclaimed with weary air water of unit generation efficiency.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of electricity generation system in the utility model embodiment;
Fig. 2 is the structured flowchart of the stove cigarette heated-air drying enclosed powder process coal-burning boiler unit reclaimed with weary air water in the utility model embodiment;
Fig. 3 is the construction module schematic diagram of the stove cigarette heated-air drying enclosed powder process coal-burning boiler unit reclaimed with weary air water in the utility model embodiment;
Fig. 4 is the block diagram of powder feeding subsystem of blowing in the utility model embodiment; And
Fig. 5 is the structural representation of the stove cigarette heated-air drying enclosed powder process coal-burning boiler unit reclaimed with weary air water in the utility model embodiment.
Detailed description of the invention
The technological means realized to make the utility model, creation characteristic, reach object and effect is easy to understand, following examples are specifically addressed the stove cigarette heated-air drying enclosed powder process coal-burning boiler unit reclaimed with weary air water of the present utility model by reference to the accompanying drawings.
Fig. 1 is the structured flowchart of electricity generation system in the utility model embodiment.
As shown in Figure 1, electricity generation system 100 comprises: the stove cigarette heated-air drying enclosed powder process coal-burning boiler unit 501, Steam Turbine 502 and the generating set 503 that reclaim with weary air water.
The heat that raw coal produces after stove cigarette heated-air drying enclosed powder process coal-burning boiler unit 501 combustion reclaimed with weary air water heats water, the steam that water adds thermosetting HTHP enters Steam Turbine 502 and does work, and then Steam Turbine 502 drive electrical generators group 503 generates electricity.
Fig. 2 is the structured flowchart of the stove cigarette heated-air drying enclosed powder process coal-burning boiler unit reclaimed with weary air water in the utility model embodiment.
As shown in Figure 2, the stove cigarette heated-air drying enclosed powder process coal-burning boiler unit 501 reclaimed with weary air water is for burning to raw coal.The stove cigarette heated-air drying enclosed powder process coal-burning boiler unit 501 reclaimed with weary air water 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.
The First air of air-supply powder feeding subsystem 403 mixes in rear feeding boiler body subsystem 402 with the coal dust of powder process subsystem 401 by a certain percentage, the Secondary Air of air-supply powder feeding subsystem 403 then directly enters boiler body subsystem 402, and the part high-temperature flue gas in boiler body subsystem 402 is drawn out of the drier component as powder process subsystem 401.Weary gas in powder process subsystem 401 is separated, with a large amount of steam i.e. wet weary gas in the weary gas be separated, the wet weary gas of major part enters weary air water recovery subsystem 404 and is cooled, most of steam in weary gas is met condensation and is become aqueous water, aqueous water reclaims in subsystem 404 to be recovered at weary air water and recycles, wet weary gas obtains the cold weary gas done after weary air water reclaims, cold weary gas is entered boiler body subsystem 401 after being processed by air-supply powder feeding subsystem 403 and burns, the hot blast that the partial fume that boiler body subsystem 401 burning produces and air-supply powder feeding subsystem 403 produce and weary gas form drier.All the other flue gases that boiler body subsystem 401 burning produces are discharged by gas cleaning subsystem 405.
Fig. 3 is the construction module schematic diagram of the stove cigarette heated-air drying enclosed powder process coal-burning boiler unit reclaimed with weary air water in the utility model embodiment.
As shown in Figure 3, powder process subsystem 401 obtains coal dust for raw coal 60 is carried out grinding separation, and 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 and recirculation blast pipe road 23, air quantity regulate pipeline 51 and drier mixing chamber 20.Here, blower mill 4, mill separator 5 and powder process pipeline 6 constitute gas powder generating apparatus, and gas powder generating apparatus can generate the primary mixture of coal dust and weary gas and this primary mixture is delivered into coal collector 7.
Boiler body subsystem 402, for being burnt by coal dust, comprising: coal burner 12, boiler 13, flue (not marking in figure) and flue gas take out mouth 19.Boiler 13 comprises burner hearth 13a, and burner hearth 13a is used for coal dust is burnt as much as possible in burner hearth 13a.
Air-supply powder feeding subsystem 403 is connected with boiler body subsystem 402 with powder process subsystem 401, and air-supply powder feeding subsystem 403 is sent in boiler body subsystem 402 for the coal dust obtained by powder process subsystem 401, provides wind regime to boiler body subsystem 402 simultaneously.Air-supply powder feeding subsystem 403 comprises: pressure fan 29, air supply duct 30, the weary air preheater of air 48, heated-air drying pipeline 47, Secondary Air hot air duct 37, secondary air bellow 38, hot blast pipe road 53, First air bellows 42, air and powder mixer 10, powder feeding pipes 11, cold weary gas blower fan 49, cold weary gas bypass 46, hot blast pipe road 53.
Weary air water reclaims subsystem 404 and is arranged between powder process subsystem 401 and air-supply powder feeding subsystem 403, effectively can reclaim the moisture in the weary gas of powder process subsystem 401 generation.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 and cold blast pipe road 28.
The smoke evacuation that gas cleaning subsystem 405 produces for the treatment of purification boiler body subsystem 402, gas cleaning subsystem 405 comprises: deduster 14, air-introduced machine 15, boiler exhaust gas pipeline 16, flue gas desulfur device 17 and chimney 18.
Annexation with stove cigarette heated-air drying enclosed powder process coal-burning boiler unit 501 entirety that weary air water reclaims:
In powder process subsystem 401, the outlet of run coal bin 1 is connected with the entrance of feeder 2, the outlet of feeder 2 is connected in raw coal pre-drying device 3, simultaneously, raw coal pre-drying device 3 is also connected with the outlet of drier mixing chamber 20, the entrance of blower mill 4 is connected with raw coal pre-drying device 3 and mill separator 5 refluxing opening, the entrance of mill separator 5 is connected with the outlet of blower mill 4, the outlet of mill separator 5 is connected on coal collector 7 by powder process pipeline 6, the coal outlet of coal collector 7 is connected with the import of Pulverized Coal Bin 8, and, the air outlet of coal collector 7 also connects the air intake vent of weary gas blower fan 22, the outlet of Pulverized Coal Bin 8 is connected with machine supplying powder 9, the air outlet of weary gas blower fan 22 regulates pipeline 51 to be connected with blower mill 4 by coal pulverizer air quantity, also be connected with the import of drier mixing chamber 20 by recirculation blast pipe road 23.
In boiler body subsystem 402, coal burner 12 is positioned at burner hearth 13a, and flue gas takes out the top that mouth 19 is arranged on boiler 13, and flue gas is taken out the outlet flue of mouth 19 and is connected with the drier mixing chamber 20 in powder process subsystem 401.
Reclaim in subsystem 404 at weary air water, weary air water recover 25 is connected with the gas outlet of the weary gas blower fan 22 in powder process subsystem 401 by 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, for storing the moisture in the weary gas that reclaimed by weary air water recover 25, reclaiming the cold weary gas after the moisture in weary gas through the condensation of weary air water recover 25 and sending into cold weary gas blower fan 49 by cold blast pipe road 28.
In air-supply powder feeding subsystem 403, the air outlet of pressure fan 29 is connected by the weary air preheater 48 of air supply duct 30 and air, the hot blast of the weary air preheater 48 of air divides two-way, one tunnel is that Part I hot blast is entered in secondary air bellow 38 by Secondary Air hot air duct 37 and then enters in coal burner 12, also has a road to be that Part II hot blast enters drier mixing chamber 20 by heated-air drying pipeline 47.One end of heated-air drying pipeline 47 is separated by the hot air duct exported through the weary air preheater 48 of air to be formed, and the other end then connects and enters drier mixing chamber 20.Hot blast pipe road 53 is connected with First air bellows 42, and air and powder mixer 10 import is connected with First air bellows 42 with machine supplying powder 9 respectively, air and powder mixer 10 is connected coal burner 12 by powder feeding pipes 11.
In gas cleaning subsystem 405, deduster 14 import exports with the fume side of the weary air preheater 48 of air and is connected, deduster 14 exports and is connected with air-introduced machine 15 import, air-introduced machine 15 is exported and is connected with flue gas desulfur device 17 import by boiler exhaust gas pipeline 16, and flue gas desulfur device 17 exports and is connected with chimney 18.
Fig. 4 is the block diagram of powder feeding subsystem of blowing in the utility model embodiment.
The flow process of air: as shown in Figure 3, Figure 4, environment cold wind 61 (i.e. air) is sent in the weary air preheater 48 of air through air supply duct 30 by pressure fan 29.The major part of the hot blast of air weary air preheater 48 air side outlet is, Part I hot blast introduces secondary air bellow 38 as Secondary Air through Secondary Air hot air duct 37, Secondary Air draws toward in coal burner 12 from secondary air box 38 distribution, and small part hot blast and Part II hot blast enter drier mixing chamber 20 through heated-air drying pipeline 47 in addition.The weary gas of Part II hot blast, Part II and take out after the part of flue gas that mouth 19 extracts mixes from flue gas and send into raw coal pre-drying device 3 as drier.
Fig. 5 is the structural representation of the stove cigarette heated-air drying enclosed powder process coal-burning boiler unit reclaimed with weary air water in the utility model embodiment.
As shown in Figure 5, the operation principle of the stove cigarette heated-air drying enclosed powder process coal-burning boiler unit 501 reclaimed with weary air water:
The flow process of coal: raw coal 60 delivers into raw coal pre-drying device 3 by run coal bin 1 through feeder 2, mix with the drier from drier mixing chamber 20 in raw coal pre-drying device 3 and descendingly complete the predrying of raw coal 60, blower mill 4 will be ground into coal dust by the dried coal of raw coal pre-drying device 3, carry out further drying to coal dust 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, coal particle thicker in wind powder mixture is isolated and is again sent the import of blower mill 4 through refluxing opening back to by mill separator 5, coal collector 7 is entered through powder process pipeline 6 by the qualified coal dust of mill separator 5 and the mixture of weary gas, weary gas is separated with coal dust by coal collector 7, for collecting coal dust, the coal dust of collection stores by Pulverized Coal Bin 8, coal dust in Pulverized Coal Bin 8 sends into air and powder mixer 10 by feeder 9, mix with a wind facies from First air bellows 42 in air and powder mixer 10, then coal burner 12 is sent in burner hearth 13a combustion by powder feeding pipes 11.
Flue gas flow: coal dust and air generate flue gas in burner hearth 13a combustion, the flue gas in burner hearth 13a is divided into two strands to be discharged in burner hearth 13a outlet.One is taken out mouth 19 from flue gas and extracts drier component as powder process subsystem 401 out, continues the follow-up heating surface of heating, and discharge boiler 13 by the outlet of the weary air preheater 48 of air in the flue that another strand is still retained in boiler 13.The flue gas that the outlet of air weary air preheater 48 fume side is discharged introduces boiler induced-draft fan 15 after deduster 14 purifies, and enter flue gas desulfur device 17 through the smoke discharging pipe 16 that air-introduced machine 15 exports, through the flue gas 62 of desulfurizing and purifying by chimney 18 discharged to atmospheric environment.
Drier flow process: take out the high-temperature flue gas that mouth 19 extracts and the mixture be mixed to get in drier mixing chamber 20 from weary gas and the Part II hot blast in recirculation blast pipe road 23 by flue gas, mixture is drier required in powder process subsystem 401, this drier enters raw coal pre-drying device 3 via drier pipeline 21, and drier mixes with coal and descending thus carry out predrying to coal in raw coal pre-drying device 3.
Weary air-flow journey: the drier of weary gas origin self-desiccation agent mixing chamber 20, powder process subsystem 401 leak out and the transpiring moisture of coal forms.Weary gas is separated in coal collector 7 with coal dust, isolated weary gas is extracted out by weary gas blower fan 22 and is divided into three parts, the weary gas of Part II sends into drier mixing chamber 20 as drier temperature control medium by recycling blast pipe road 23, the weary gas of Part III regulates pipeline 51 to enter blower mill 4 by air quantity, supplement the air quantity entering blower mill 4, the weary gas of Part I sends into weary air water recover 25 through blast pipe road 24.The weary gas of high hygroscopic water is cooled by refrigerant 80 in weary air water recover 25, thus obtains a large amount of aqueous water, and aqueous water combines in collecting-tank 27.The cold weary gas that weary air water recovery system 25 is discharged draws toward cold weary gas blower fan 49 through cold blast pipe road 28, cold for part weary pneumatic transmission enters in the weary air preheater of air 48 to carry out heating to obtain hot weary gas by cold weary gas blower fan 49, cold for another part weary gas is sent in hot blast pipe road 53 by cold weary gas bypass 46 by cold weary gas blower fan 49, First air bellows 42 are transfused to as First air after the cold weary gas of this part mixes in hot blast pipe road 53 with the weary gas of heat, then First air enters coal burner 12 by powder feeding pipes 11 with coal dust after air and powder mixer 10 mixes, by regulating the flow of cold weary gas in cold weary gas bypass 46 thus regulating the temperature of First air, First air enters burner hearth 13a and burns, weary gas in First air is melted down participate in burning can ensure the abundant after-flame of volatile matter that may contain in weary gas thus the efficiency of combustion ensureing raw coal 60.
The effect of embodiment and effect
The stove cigarette heated-air drying enclosed powder process coal-burning boiler unit reclaimed with weary air water involved by the present embodiment, because coal collector make coal dust and weary gas separated at coal collector, and be enriched with a large amount of steam in weary gas and in weary gas steam volume share much larger than steam volume share in boiler exhaust gas, steam volume share height and water dew point high, so substantially increase by weary gas lowered temperature reclamation condensate water the exploitativeness that moisture in flue gas reclaims.Weary gas in high-moisture coal pulverizing system is enriched with large quantity of moisture, and aqueous dew point temperature is high, by weary air cooling recyclable a large amount of liquid condensate water, has outstanding Water Sproading benefit.
And, the weary gas formed in powder process subsystem obtains cold weary gas reclaimed the moisture in weary gas by weary air water retracting device after, a part for cold weary gas enters in the weary air preheater of air and carries out heating and obtain hot weary gas by cold weary gas blower fan, as First air after another part is mixed with the weary gas of heat by cold weary gas bypass in hot blast pipe road 53, this First air oxygen content is low, coal dust can be avoided in powder feeding pipe combustion, thus carry high volatile coal dust to coal burner safely.Meanwhile, this hypoxic First air can adopt higher powder feeding temperature, thus significantly improves the combustion stability of breeze airflow.And after adopting above-mentioned powder process subsystem, the burner hearth flame temperature of boiler can increase, and further enhances catching fire and after-flame performance of breeze airflow.
Further, because have employed enclosed powder process, namely weary gas melts down and participates in burning, makes the volatile matter also abundant after-flame in stove that may contain in weary gas, thus ensure that the efficiency of combustion of raw coal.And, because the volatile matter may separated out in pulverizing process to enter in stove and after-flame with First air, so need not strictly control pulverizer outlet temperature in order to avoid Volatile in lower value in enclosed powder process unit, pulverizer outlet temperature can appropriateness improve, this significantly reduces the requirement to powder process subsystem Operation and control on the one hand, reducing because coal dust moisture raises with pulverizer outlet temperature on the other hand makes more moisture in coal be evaporated in weary gas, thus increases the water yield reclaimed from weary gas further.
And, because from powder process subsystem evaporate the major part of the moisture in producing coal and no longer enter burner hearth because weary air water reclaims, and the cold smoke to be extracted by boiler induced-draft fan exhaust pass is no longer at boiler Inner eycle, the exhaust gas volumn flowing through back-end ductwork and the weary air preheater of air in boiler is obviously reduced, result is that the cigarette/geomantic omen equivalent proportion of the weary air preheater of air reduces, and namely air weary air preheater outlet exhaust gas temperature reduces.In addition boiler exhaust gas amount also reduces because a part of steam reclaims in weary air water retracting device, and thus boiler exhaust gas heat loss reduces, the corresponding raising of boiler thermal output.Further, due to some heat from boiler back end ductwork flue gas of thermal source (with Part II hot blast for heat-carrying agent) of the drying capacity of the powder process subsystem of the present embodiment, thus high-temperature flue gas extraction amount is tending towards reducing, the air capacity simultaneously flowed through in the weary air preheater of air obviously increases, obviously in the weary air preheater of air the increase amplitude of air mass flow far above the increase amplitude of flue gas flow, result is that the cigarette/geomantic omen equivalent proportion in the weary air preheater of air can reduce further, namely under identical air weary air preheater inlet flue gas temperature and outlet hot blast temperature, the outlet exhaust gas temperature of the weary air preheater of air can reduce further.Thus the stove cigarette heated-air drying enclosed powder process coal-burning boiler unit reclaimed with weary air water of the present embodiment can make boiler thermal output improve further.
In the present embodiment, also can regulate First air temperature easily by arranging cold weary gas bypass duct on air weary air preheater side, thus ensure powder feeding safety and breeze airflow combustion stability, regulate the adjustable First air temperature of cold weary gas bypass flow.By regulating the flow of weary gas in recirculation blast pipe road can regulate desiccant temperature easily, thus ensure that raw coal pre-drying device internal desiccant is to the predrying effect of raw coal.Regulate pipeline by air quantity, coal pulverizer can be made to work under optimal ventilation amount, thus ensure pulverizer capacity and reduce powder process power consumption.
To sum up, embodiment can provide a kind of green high-efficient coal generating system, the problem solving high-moisture coal-fired boiler combustion instability, the coal-grinding power consumption decreasing coal pulverizer, overcome the inefficient shortcoming of traditional high-moisture coal-fired boiler hot, great lot of water resources can be reclaimed by height containing the condensation of lowering the temperature of wet weary gas while significantly improving boiler thermal output and unit generation efficiency, make realization " zero water consumption " efficient fuel coal power plant become possibility, there is outstanding economic benefit and environment protection significance.
The stove cigarette heated-air drying enclosed powder process coal-burning boiler unit reclaimed with weary air water involved by certain the utility model and electricity generation system are not merely defined in structure in the above-described embodiments.Above content is only the basic explanation under the utility model design, and according to any equivalent transformation that the technical solution of the utility model is done, all should belong to protection domain of the present utility model.

Claims (5)

1., with the stove cigarette heated-air drying enclosed powder process coal-burning boiler unit that weary air water reclaims, for burning to raw coal, 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: the raw coal pre-drying device connected in turn, gas powder generating apparatus, 5 coal collectors, Pulverized Coal Bin, machine supplying powder and the drier mixing chamber be connected with described raw coal pre-drying device,
Described boiler body subsystem comprises: the flue gas be provided with near the boiler of burner hearth, the flue be connected with the afterbody of described burner hearth, the coal burner being positioned at described burner hearth entry position and the exhanst gas outlet being positioned at described burner hearth takes out mouth,
Described air-supply powder feeding subsystem comprises: air and powder mixer, be positioned at described flue afterbody the pre-10 hot devices of the weary gas of air, for providing the pressure fan of environment cold wind, cold weary gas blower fan and hot blast pipe road,
Described weary air water reclaims subsystem and comprises: the weary air water retracting device be connected with the gas vent of described coal collector,
Described raw coal pre-drying device utilizes the drier from described drier mixing chamber to carry out predrying to described raw coal,
Described gas powder generating apparatus to the described raw coal after predrying grind with further drying after obtain primary mixture,
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 flows to the coal-supplying amount of described air and powder mixer for measuring also regulable control,
Described air and powder mixer is mixed to get wind powder mixture to from the First air of 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 weary gas of Part I in described weary gas is introduced and is reclaimed by the moisture in weary for this Part I gas by described weary air water retracting device, and the weary gas of described Part I obtains cold weary gas after the condensation of described weary air water retracting device,
The weary air preheater of described air carries out heating to described environment cold wind and obtains hot blast, and the Part I hot blast in described hot blast directly sends into described coal burner as Secondary Air, and the Part II hot blast in described hot blast directly sends into described drier mixing chamber,
A part for described cold weary gas is introduced in the weary air preheater of described air and is carried out preheating and obtain hot weary gas by described cold weary gas blower fan, and another part of the weary gas of described heat and described cold weary gas sends into air and powder mixer as First air through described hot blast pipe road,
Described drier mixing chamber takes out mouth with described flue gas respectively, the weary air preheater of described air is connected, after the described flue gas and described Part II hot blast of taking out mouth extraction from described flue gas mix, send into described raw coal pre-drying device as described drier.
2., according to the stove cigarette heated-air drying enclosed powder process coal-burning boiler unit reclaimed with weary air water described in claim 1, it is characterized in that, also comprise:
Gas cleaning subsystem, comprises: the deduster be connected with the weary air preheater of described air, 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. the stove cigarette heated-air drying enclosed powder process coal-burning boiler unit reclaimed with weary air water 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 for the blast pipe road carried described weary gas, the weary air water recover be connected with described blast pipe road and the collecting-tank storing described weary air water.
4. the stove cigarette heated-air drying enclosed powder process coal-burning boiler unit reclaimed with weary air water according to claim 1, is characterized in that:
Wherein, described powder process subsystem also comprises one end and exports with the weary gas of described coal collector and be connected, the recirculation blast pipe road that the other end is connected with the import of described drier mixing chamber,
Described recirculation blast pipe road is used for the weary pneumatic transmission of Part II that described weary gas exports in the described weary gas sent to enter described drier mixing chamber,
The weary gas of described Part II and described drier are mixed for the temperature regulating described drier.
5. the stove cigarette heated-air drying enclosed powder process coal-burning boiler unit reclaimed with weary air water according to claim 1, is characterized in that:
Wherein, described powder process subsystem also comprises one end and exports with the weary gas of described coal collector and be connected, the air quantity that the other end is connected with the import of described gas powder generating apparatus regulates pipeline, supplements for the described weary gas weary pneumatic transmission of Part III exported in the described weary gas sent being entered described gas powder generating apparatus the air quantity regulating and enter described gas powder generating apparatus.
CN201420532128.8U 2014-09-16 2014-09-16 With the stove cigarette heated-air drying enclosed powder process coal-burning boiler unit that weary air water reclaims Withdrawn - After Issue CN204114983U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104197358A (en) * 2014-09-16 2014-12-10 上海理工大学 Flue gas hot air drying closed type pulverization coal-fired boiler unit with exhaust water recycling function

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104197358A (en) * 2014-09-16 2014-12-10 上海理工大学 Flue gas hot air drying closed type pulverization coal-fired boiler unit with exhaust water recycling function
CN104197358B (en) * 2014-09-16 2016-06-08 上海理工大学 With the stove cigarette hot air drying enclosed powder process coal-burning boiler unit that weary air water reclaims

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