CN104197359A - Fume and hot exhaust dried closed pulverization coal-fired boiler unit with function of exhaust water recovery - Google Patents
Fume and hot exhaust dried closed pulverization coal-fired boiler unit with function of exhaust water recovery Download PDFInfo
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- CN104197359A CN104197359A CN201410472512.8A CN201410472512A CN104197359A CN 104197359 A CN104197359 A CN 104197359A CN 201410472512 A CN201410472512 A CN 201410472512A CN 104197359 A CN104197359 A CN 104197359A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention provides a fume and hot exhaust dried closed pulverization coal-fired boiler unit with a function of exhaust water recovery. The fume and hot exhaust dried closed pulverization coal-fired boiler unit is characterized in that an air exhaust preheater heats ambient cold air and cold exhaust into hot air and hot exhaust, a part of the hot air, a part of the ambient cold air and a part of the hot exhaust are mixed into primary air, the other part of the hot air is used as secondary air fed into a pulverized coal burner, an exhaust water recovery device recovers water from a first part of exhaust, an air exhaust preheater is connected with the exhaust water recovery device, the exhaust water recovery device cools high-humidity exhaust discharged by a pulverization subsystem so as to obtain a great deal of condensate and discharge cold exhaust, and a drier mixing chamber is connected with a fume suction opening and the air exhaust preheater and mixes fume extracted from the fume suction opening and the other part of the hot exhaust into drier which is then fed into a raw coal pre-drying device.
Description
Technical field
The weary air dry enclosed powder process coal-burning boiler unit of the stove cigarette reclaiming with weary air water heat that the present invention relates to a kind 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.Account for world's coal gross reserves 40% at worldwide brown coal.China's brown coal account for domestic coal gross reserves 16%, are mainly distributed in area and Yunnan Province that east Inner Mongolia and three provinces in the northeast of China have a common boundary.The brown coal of the Inner Mongol and the Northeast belong to old brown coal, total moisture 25～40%; Yunnan lignite belongs to young brown coal, and total moisture 40～60%, containing wood fibre.In addition, the coal prognostic reserves that are positioned at Xinjiang of China In The Eastern Junggar Basin " accurate eastern coalfield " reach 3,900 hundred million tons, are the self-contained coalfields of China's maximum.Accurate eastern coal is except caloric value is compared with brown coal height, and other coal characteristic is similar to brown coal, also has that moisture is high, volatile matter is high, ash fusion point is low, abrasiveness is low and the feature of easy spontaneous combustion.
Utilize level for improving brown coal, carried out the brown coal drying technical research of various ways both at home and abroad.With the thermal power plant integrated predrying technology of drawing gas by predrying for brown coal steam condensation used heat, can improve in theory 2～4 percentage points of power plant efficiencies, but no matter steam pipe roller drier or in heating steam fluidized-bed process, it between coal grain and steam, is the wall-type heat exchange that heat transfer intensity is lower, therefore drying equipment is bulky, equipment investment and operating cost are very large.Flue gas (or hot-air) dry technology can adopt the forms such as fluid bed, moving bed and gas flow tube, between coal grain and flue gas (or hot-air), it is the mixing heat-exchange that heat transfer intensity is higher, but the dry safety in operation of flue gas (or hot-air) is poor, drying system easily catches fire, and needs strict desiccant temperature and the oxygen content controlled.Mechanical/thermal press-dehydrating and heating power dehydration are non-evaporation drying technology, thereby to be energy consumption for drying low and can remove a part of alkali metal material improves boiler scaling and contamination for advantage, but dehydration conditions is HTHP, and equipment enlarging is more difficult, and the intractability of dewatering system waste discharge is larger.Due to easily cracked easy spontaneous combustion of brown coal, the moulding of dry rear brown coal and safe storage transport are also comparatively difficult.Visible, all there is distinctive difficulty in current all kinds of brown coal drying technology, still needs further research with perfect before scale application.
Brown coal moisture is high, calorific value is low and easy spontaneous combustion, therefore unsuitable long distance transportation.The main path that brown coal utilize is at present still by electric power stations near coal-mines combustion power generation, then transmits electric power to the area of needs.And the installed capacity of Chinese large-sized combustion brown coal generating sets (single-machine capacity >=200MW) only accounts for 3% left and right of national thermoelectricity total installation of generating capacity, far below brown coal shared ratio (16%) in coal gross reserves.So along with the ratio of High Quality Tobacco coal reserves constantly declines, development brown coal unit is significant to China's Sustainable Development of Power Industry.
At present existing many 600MW level brown coal units of China put into operation, and all configure unit pulverized-coal system boiler.But compared with conventional bituminous coal fired boiler, the thermal efficiency of these boiler using brown coals lower (approximately low 2 percentage points) and price are higher, this is main because the inner flue gas of the stove amount in boiler using brown coal is larger, thereby boiler exhaust gas heat loss is higher, and boiler volume is also larger.In addition, the unit pulverized-coal system of high-moisture fire coal needs extracting high-temperature stove cigarette as pulverized coal preparation system drier key component, and this makes to contain the inert gases such as a large amount of stove cigarettes and steam in a wind, causes Boiler Stable Combustion also comparatively difficult.
In 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, 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 weary air dry enclosed powder process coal-burning boiler unit of the stove cigarette reclaiming with weary air water heat of high efficiency generating.
The invention provides a kind of weary air dry enclosed powder process coal-burning boiler unit of stove cigarette heat reclaiming 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 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: the boiler that is provided with burner hearth, the flue being connected with the afterbody of burner hearth, near the flue gas that is positioned at the coal burner of burner hearth entry position and be positioned at the exhanst gas outlet of burner hearth is taken out mouth, air-supply powder feeding subsystem comprises: air and powder mixer, be positioned at the weary air preheater of air of flue afterbody, for the pressure fan of environment cold wind is provided, a wind mixing chamber, cold weary gas blower fan, the the first hot blast pipe road being connected with drier mixing chamber and the second hot blast pipe road being connected with wind mixing chamber, 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 the raw coal after predrying being ground and being further dried, coal collector separates and obtains coal dust and weary gas primary mixture, 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, weary air water retracting device is introduced weary the Part I in weary gas gas and the moisture in weary this Part I gas is reclaimed, the weary gas of Part I obtains cold weary gas after the condensation of weary air water retracting device, weary gas blower fan heats the weary air preheater of cold weary gas introducing air to obtain hot weary gas, a part for the weary gas of heat enters drier mixing chamber by the first hot blast pipe road, an other part for the weary gas of heat enters wind mixing chamber one time by the second hot blast pipe road, the weary air preheater of air obtains hot blast to component environment cold air heating, a part for hot blast is directly sent into coal burner as Secondary Air, one time wind mixing chamber is used for another part of hot blast, after mixing, another part of the weary gas of heat and another part environment cold wind obtains wind one time, wind and coal dust are mixed to get wind powder mixture by air and powder mixer, drier mixing chamber is taken out mouth with flue gas respectively and is connected with the weary air preheater of air, using mixing, a part of taking out mouthful flue gas extracting and hot weary gas from flue gas sends into raw coal pre-drying device as drier.
In the weary air dry enclosed powder process coal-burning boiler unit of stove cigarette heat reclaiming with weary air water provided by the invention, there is such feature, also comprise: gas cleaning subsystem, comprise: the deduster, air-introduced machine, boiler exhaust gas pipeline, flue gas desulfur device and the chimney that are connected with the weary air preheater of air, 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 air dry enclosed powder process coal-burning boiler unit of stove cigarette heat reclaiming with weary air water provided by the invention, can also there is such feature: wherein, weary air water retracting device comprises: be connected with the gas vent of coal collector for the blast pipe road that weary gas is carried, the weary air water recover being connected with blast pipe road and the collecting-tank that stores weary air water.
In the weary air dry enclosed powder process coal-burning boiler unit of stove cigarette heat reclaiming with weary air water provided by the invention, can also there is such feature: wherein, powder process subsystem also comprises that one end is connected with the weary gas outlet of coal collector, the recirculation blast pipe road that the other end is connected with the import of drier mixing chamber, recirculation blast pipe road enters drier mixing chamber for the weary pneumatic transmission of Part II that weary gas is exported to the weary gas of sending, and the weary gas of Part II and drier are mixed for regulating the temperature of drier.
In the weary air dry enclosed powder process coal-burning boiler unit of stove cigarette heat reclaiming with weary air water provided by the invention, can also there is such feature: wherein, powder process subsystem also comprises that one end is connected with the weary gas outlet of coal collector, air quantity that the other end is connected with the import of gas powder generating apparatus regulates pipeline, enters gas powder generating apparatus and supplement adjusting and enter the air quantity of gas powder generating apparatus for weary gas export to the weary pneumatic transmission of Part III of sending.
Effect and the effect of invention
In the weary air dry enclosed powder process coal-burning boiler unit of stove cigarette heat reclaiming with weary air water of the present invention, 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 weary gas steam volume share much larger than steam volume share in boiler exhaust 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.Further, drier using the mixture that formed after near the flue gas of the high temperature that extracts furnace outlet and hot weary gas mix as powder process subsystem in the present invention, can further improve weary gas water capacity and water dew point, moisture in weary gas can be recycled more economically effectively, improve pulverized coal preparation system safety in operation thereby also make drier oxygen content significantly reduce simultaneously.
And, the weary gas forming in powder process subsystem obtains cold weary gas after reclaiming the steam in weary gas by weary air water retracting device, cold weary gas is delivered to the weary air preheater heating of air by cold weary gas blower fan and is obtained hot weary gas, a part, a part for environment cold wind and the part for hot weary gas of hot blast are mixed to get wind one time, a this wind oxygen content is low, can avoid coal dust at powder feeding combustion inner pipe, thereby carry safely high volatile coal dust to coal burner.Meanwhile, a this hypoxic wind can adopt higher powder feeding temperature, thereby significantly improves the combustion stability of breeze airflow.And, adopting after above-mentioned powder process subsystem, in the burner hearth of boiler, flame temperature can increase, and has further strengthened catching fire and after-flame performance of breeze airflow.
And because adopted enclosed powder process, weary gas melts down and participates in burning, make also abundant after-flame in burner hearth of the volatile matter that may contain in weary gas, thereby ensured the efficiency of combustion of raw coal.Because the volatile matter that may separate out in pulverizing process enters in burner hearth and after-flame with a wind, so needn't strictly control coal pulverizer outlet temperature in lower value for fear of Volatile in enclosed powder process unit, coal pulverizer outlet temperature can appropriateness improve, this has obviously reduced the requirement to powder process subsystem Operation and control on the one hand, because coal dust moisture raises to reduce with coal pulverizer outlet temperature, moisture in more coal dusts is evaporated in weary gas on the other hand, thereby has further increased the water yield reclaiming from weary gas.
And, because reclaiming, weary air water no longer enters burner hearth because evaporate the major part of moisture in coal dust from powder process subsystem, and the cold smoke being extracted by air-introduced machine exhaust pass no longer circulates in boiler, the exhaust gas volumn of back-end ductwork and the weary air preheater of air of making to flow through in boiler obviously reduces, cigarette/geomantic omen equivalent proportion of the weary air preheater of air is reduced, i.e. the weary air preheater outlet of air exhaust gas temperature reduces.In addition, boiler exhaust gas amount also reclaims and reduces in weary air water retracting device because of a part of steam, thereby boiler exhaust gas heat loss reduces, the corresponding raising of boiler thermal output.Further, drier using the flue gas of high temperature and the mixture of hot weary gas as powder process subsystem, high-temperature flue gas extraction amount is reduced, in the weary air preheater of air, cold medium caloric receptivity increases simultaneously, cigarette/geomantic omen equivalent proportion in the weary air preheater of air is further reduced, and therefore boiler thermal output can further improve.
Therefore, the present invention can provide a kind of not only realize the moisture in weary gas to reclaim and recycle can also realize boiler thermal output and unit generation efficiency is higher and the weary air dry enclosed powder process coal-burning boiler unit of the stove cigarette reclaiming with weary air water heat of security of operation.
Brief description of the drawings
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 air dry enclosed powder process coal-burning boiler unit of stove cigarette heat that reclaims with weary air water in the embodiment of the present invention;
Fig. 3 is the construction module schematic diagram of the weary air dry enclosed powder process coal-burning boiler unit of stove cigarette heat that reclaims with weary air water in the embodiment of the present invention;
Fig. 4 is the block diagram of powder feeding subsystem of blowing in the embodiment of the present invention; And
Fig. 5 is the structural representation of the weary air dry enclosed powder process coal-burning boiler unit of stove cigarette heat that reclaims with weary air water in the embodiment of the present invention.
Detailed description of the invention
For technological means, creation characteristic that the present invention is realized, reach object and effect is easy to understand, following examples are specifically addressed the weary air dry enclosed powder process coal-burning boiler unit of stove cigarette heat reclaiming with weary air water of the present invention by reference to the accompanying drawings.
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 air dry enclosed powder process coal-burning boiler unit 501 of stove cigarette heat, Steam Turbine 502 and the generating set 503 that reclaim with weary air water.
The heat that raw coal produces afterwards in the weary air dry enclosed powder process coal-burning boiler unit of the stove cigarette heat 501 interior burnings of reclaiming 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 drives generating set 503 to generate electricity.
Fig. 2 is the structured flowchart of the weary air dry enclosed powder process coal-burning boiler unit of stove cigarette heat that reclaims with weary air water in the embodiment of the present invention.
As shown in Figure 2, the weary air dry enclosed powder process coal-burning boiler unit 501 of stove cigarette heat reclaiming with weary air water is for burning to raw coal.The weary air dry enclosed powder process coal-burning boiler unit 501 of stove cigarette heat reclaiming 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.
After mixing by a certain percentage with the coal dust of powder process subsystem 401, a wind of air-supply powder feeding subsystem 403 sends in boiler body subsystem 402, the Secondary Air of air-supply powder feeding subsystem 403 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, in the weary gas being separated with a large amount of steam, most of wet weary gas 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 and is recovered and recycles at weary air water, the cold weary gas that wet weary gas obtains doing after weary air water reclaims, cold weary gas is heated to form hot weary gas in air-supply powder feeding subsystem 403, the hot weary gas of a part enters drier mixing chamber as drier component, the weary gas of another part heat enters wind mixing chamber one time as a wind component.
Fig. 3 is the construction module schematic diagram of the weary air dry enclosed powder process coal-burning boiler unit of the stove cigarette reclaiming with weary air water heat in the embodiment of the present invention.
As shown in Figure 3, powder process subsystem 401 obtains coal dust for raw coal 60 being ground separate, 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, coal pulverizer air quantity regulate pipeline 51 and drier mixing chamber 20.Here, blower mill 4, mill separator 5 and powder process pipeline 6 have formed 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 coal dust is burnt, comprising: coal burner 12, boiler 13 and flue gas are taken out mouth 19.In boiler 13, be provided with burner hearth 13a, burner hearth 13a is used for making coal dust burning 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, sends into boiler body subsystem 402 for powder process subsystem 401 is obtained to coal dust, provides wind regime to boiler body subsystem 402 simultaneously.Air-supply powder feeding subsystem 403 comprises: the weary air preheater of pressure fan 29, air supply duct 30, air 48, wind-heat wind pipeline 36, Secondary Air hot air duct 37, secondary air bellow 38, wind mixing chamber 39, wind pipeline 40, booster fan 41, wind bellows 42, air and powder mixer 10, powder feeding pipes 11, cold weary gas blower fan 49, the first hot blast pipe road 50 and a second 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, can effectively reclaim the moisture in the weary gas that powder process subsystem 401 produces.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.
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.
The annexation of the weary air dry enclosed powder process coal-burning boiler unit of stove cigarette heat 501 entirety that reclaim with weary air water:
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 openings, 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 is taken out mouthfuls 19 tops that are arranged on boiler 13, and flue gas is taken out mouthfuls 19 outlet flue 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 weary gas blower fan 22 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 of the weary gas being reclaimed by weary air water recover 25, the gas outlet of weary air water recover 25 is connected with cold weary gas blower fan 49 by cold blast pipe road 28.The cold weary gas reclaiming after the moisture in weary gas through weary air water recover 25 is transported in the weary air preheater 48 of air through cold weary gas blower fan 49.
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 parts, a part is connected and enters in coal burner 12 with secondary air bellow 38 by Secondary Air hot air duct 37, another part is connected with a wind mixing chamber 39 by a wind-heat wind pipeline 36, a wind mixing chamber 39 also connects the port of export in the second hot blast pipe road 53, thereby make the hot weary gas of a part enter wind mixing chamber 39 one time, the weary gas of another part heat enters drier mixing chamber 20 by the first hot blast pipe road 50.Wind mixing chamber 39, wind pipeline 40, booster fan 41, wind bellows 42 connect in turn, and air and powder mixer 10 imports are connected with wind 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 imports are connected with the fume side outlet of the weary air preheater 48 of air, deduster 14 exports with air-introduced machine 15 imports and is connected, air-introduced machine 15 outlets are connected with flue gas desulfur device 17 imports by boiler exhaust gas pipeline 16, and flue gas desulfur device 17 exports with chimney 18 and is connected.
Fig. 4 is the block diagram of powder feeding subsystem of blowing in the embodiment of the present invention.
The flow process of air: as shown in Figure 3, Figure 4, environment cold wind 61 (being air) is sent in the weary air preheater 48 of air through air supply duct 30 by pressure fan 29.Most of hot blast of the hot blast of the weary air preheater 48 air side outlets of air is introduced secondary air bellow 38 as Secondary Air through Secondary Air hot air duct 37, and distribute and draw toward burner 12 from secondary air box 38, small part hot blast is introduced wind mixing chamber 39 one time through a wind-heat wind pipeline 36 in addition.The weary gas of part heat that hot blast, component environment cold wind and the second hot blast pipe road 53 in a wind mixing chamber 39 exported is mixed to form wind by a certain percentage one time, regulates the temperature of a wind by the flow of the flow of adjusting portion time-sharing environment cold wind and the hot blast of inflow mixed once chamber 39.Regulate the temperature of this wind until a required air temperature of coal dust safe transport and smooth combustion, the wind that wind mixing chamber 39 exports enters in supercharging primary air fan 41 through a wind-heat wind pipeline 40, after being pressurized, be sent to wind bellows 42 one time, distribute and draw toward air and powder mixer 10 from wind bellows 42 again, and then by flowing of a wind, coal dust is sent in burner hearth 13a and burnt.
Fig. 5 is the structural representation of the weary air dry enclosed powder process coal-burning boiler unit of stove cigarette heat that reclaims with weary air water in the embodiment of the present invention.
The operation principle of the weary air dry enclosed powder process coal-burning boiler unit 501 of stove cigarette heat reclaiming with weary air water as shown in Figure 5:
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 with mix from the drier of drier mixing chamber 20 and descending the predrying of raw coal that complete, blower mill 4 will be ground into coal dust by the dried coal of raw coal pre-drying device 3, coal dust will further be dried simultaneously.The weary gas (gas that blower mill 4 exports is called weary gas) that blower mill 4 exports enters mill separator 5 with the mixture of coal dust, the import of blower mill 4 isolated coal particle thicker in wind powder mixture again send back to through refluxing opening by mill separator 5, enter coal collector 7 by the qualified coal dust of mill separator 5 and the mixture of weary gas through powder process pipeline 6, coal collector 7 separates weary gas with coal dust, be used for collecting coal dust, Pulverized Coal Bin 8 stores the coal dust of collection, 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 facies from wind bellows 42, then be sent to coal burner 12 by powder feeding pipes 11 burns in burner hearth 13a.
Flue gas flow: coal dust and air burn and generate flue gas in burner hearth 13a, the flue gas in burner hearth 13a is divided into two strands in burner hearth 13a outlet and is discharged from.One takes out mouthful 19 drier components of extracting out as powder process subsystem 401 from flue gas, and another strand is still retained in the interior follow-up heating surface of heating that continues of flue of boiler 13, and discharges boiler 13 by the outlet of the weary air preheater 48 of air.The flue gas that the 48 fume side outlets of the weary air preheater of air are discharged is introduced air-introduced machine 15 after deduster 14 purifies, and enters 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 mouthful 19 high-temperature flue gas that extract and also have the hot weary gas of part to be mixed to get drier required in powder process subsystem 401 in drier mixing chamber 20 from the weary gas in recirculation blast pipe road 23 by flue gas, this drier enters raw coal pre-drying device 3 via drier pipeline 21, thereby drier mixes with coal and descendingly carries out predrying to coal in raw coal pre-drying device 3.
Weary air-flow journey: drier, the powder process subsystem 401 of weary gas origin self-desiccation agent mixing chamber 20 leaks out and the transpiring moisture of coal forms.Weary gas separates in coal collector 7 with coal dust, isolated weary gas is extracted out by weary gas blower fan 22 and is divided into three parts, the weary gas of Part II is sent 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, the air quantity that enters blower mill 4 is supplemented, and the weary gas of Part I is sent into weary air water recover 25 through blast pipe road 24.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 reclaims subsystem discharge is heated into hot weary gas through the weary air preheater 48 of air, the hot weary gas of a part is sent to wind mixing chamber 39 one time via the second hot blast pipe road 53, after mixing with component environment cold wind, a part of hot blast in a wind mixing chamber 39, form a wind, the weary gas of another part heat enters drier mixing chamber 20 as a wherein component of drier via the first hot blast pipe road 50.The flow that enters a wind mixing chamber by adjusting ambient cold wind can regulate the temperature of a wind, wind and coal dust enter burner hearth 13a and burn, thereby the weary gas in a wind melts down and participates in burning and can ensure that the abundant after-flame of the volatile matter that may contain in weary gas ensures the efficiency of combustion of raw coal 60.
The effect of embodiment and effect
The stove cigarette that with weary air water the reclaim heat weary air dry enclosed powder process coal-burning boiler unit related according to the present embodiment, 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 weary gas steam volume share much larger than steam volume share in boiler exhaust 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.Weary gas in the coal-fired powder process subsystem of high-moisture is enriched with large quantity of moisture, and 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 the present embodiment, using high-temperature flue gas, recycle weary gas and hot weary gas mixture as drier, can further improve weary gas water capacity and water dew point, realize thereby weary air water is reclaimed more easily.
And, using the flue gas of high temperature, recycle weary gas and hot weary gas mixture as powder process subsystem drier, make the oxygen content of drier obviously less compared with conventional dry drying prescription, thereby obviously reduced the risk of coal combustion explosion in flour mill flow, improved pulverized coal preparation system safety in operation.
And, the weary gas forming in powder process subsystem obtains cold weary gas after reclaiming the steam in weary gas by weary air water retracting device, cold weary gas is delivered to heating in the weary air preheater of air by cold weary gas blower fan and is obtained hot weary gas, a part, a part for environment cold wind and the part for hot weary gas of hot blast are mixed to get wind one time, a this wind oxygen content is low, can avoid coal dust at powder feeding combustion inner pipe, thereby carry safely high volatile coal dust to coal burner.Meanwhile, a this hypoxic wind can adopt higher powder feeding temperature, thereby significantly improves the combustion stability of breeze airflow.And, adopting after above-mentioned powder process subsystem, in the burner hearth of boiler, flame temperature can increase, and has further strengthened catching fire and after-flame performance of breeze airflow.
And because adopted enclosed powder process, weary gas melts down and participates in burning, make also abundant after-flame in stove of the volatile matter that may contain in weary gas, thereby ensured the efficiency of combustion of raw coal.And, because the volatile matter that may separate out in pulverizing process enters in stove and after-flame with a wind, so needn't strictly control coal pulverizer outlet temperature in lower value for fear of Volatile in enclosed powder process unit, coal pulverizer outlet temperature can appropriateness improve, this has obviously reduced the requirement to powder process subsystem Operation and control on the one hand, because coal dust moisture raises to reduce with coal pulverizer outlet temperature, more moisture in coal are evaporated in weary gas on the other hand, thereby have further increased the water yield reclaiming from weary gas.
And, because reclaiming, weary air water no longer enters burner hearth because evaporate the major part of moisture in coal from powder process subsystem, and the cold smoke being extracted by boiler induced-draft fan exhaust pass no longer circulates in boiler, the exhaust gas volumn of back-end ductwork and the weary air preheater of air of making to flow through in boiler obviously reduces, result is that cigarette/geomantic omen equivalent proportion of the weary air preheater of air reduces, i.e. the weary air preheater outlet of air exhaust gas temperature reduces.In addition boiler exhaust gas amount is also because a part of steam reclaims and reduces in weary air water retracting device, thereby boiler exhaust gas heat loss reduces, the corresponding raising of boiler thermal output.Further, using the flue gas of high temperature, recycle the mixture of weary gas and hot weary gas as the drier of pulverized coal preparation system, 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/geomantic omen equivalent proportion in the weary air preheater of air is further reduced, and therefore boiler thermal output can further improve.
And, by being set, wind mixing chamber can regulate easily air temperature and primary air ratio, thereby ensure powder feeding safety and breeze airflow combustion stability, one time weary heat gas, component environment cold wind and part hot blast are mixed to form wind one time by wind mixing chamber, and the temperature of a wind can be regulated by the flow of the flow of adjusting portion time-sharing environment cold wind and part hot blast.Recycle weary tolerance by adjusting and can regulate easily desiccant temperature, thereby ensure the predrying effect of high-temperature flue gas to raw coal in raw coal pre-drying device.Regulate pipeline by coal pulverizer air quantity is set, can make coal pulverizer work under optimal ventilation amount, thereby ensure pulverizer capacity and reduce powder process power consumption.
To sum up, the present embodiment can provide a kind of green high-efficient coal generating system, solve the unsettled problem of high-moisture coal-fired boiler combustion, reduce the coal-grinding power consumption of coal pulverizer, overcome the inefficient shortcoming of traditional high-moisture coal-fired boiler hot, in significantly improving boiler thermal output and unit generation efficiency, 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 are obviously improved, weary air water is reclaimed and be easy to Project Realization, also make to be increased by cooling weary gas gained condensing capacity.
Certainly the weary air dry enclosed powder process coal-burning boiler unit of the stove cigarette reclaiming with weary air water heat involved in the present invention is not merely defined in the structure in above-described embodiment one.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 (5)
1. the weary air dry enclosed powder process coal-burning boiler unit of stove cigarette heat reclaiming with weary air water, 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: the flue that is provided with the boiler of burner hearth, is 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 weary air preheater of air of described flue afterbody, for the pressure fan of environment cold wind, wind mixing chamber, cold weary gas blower fan, the first hot blast pipe road being connected with described drier mixing chamber and the second hot blast pipe road being connected with a described wind mixing chamber are provided
Described weary air water reclaims subsystem and comprises: the weary air water retracting device being connected with the gas vent of described coal collector,
The utilization of described raw coal pre-drying device is carried out predrying to described raw coal from the drier of described drier mixing chamber,
Described gas powder generating apparatus obtains primary mixture after the described raw coal after predrying being ground and being further dried,
Described coal collector separates and obtains coal dust and weary gas described primary mixture,
Described Pulverized Coal Bin stores described coal dust,
Described machine supplying powder is for measuring and regulate the boiler coal feeding amount of described air and powder mixer of flowing to 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 weary air water retracting device is introduced weary the Part I in described weary gas gas and the moisture in weary this Part I gas is reclaimed, and the weary gas of described Part I obtains cold weary gas after the condensation of weary air water retracting device,
Described weary gas blower fan is introduced the weary air preheater of described air by described cold weary gas and is heated and obtain hot weary gas,
A part for the weary gas of described heat enters described drier mixing chamber by described the first hot blast pipe road, and an other part for the weary gas of described heat enters a described wind mixing chamber by described the second hot blast pipe road,
The weary air preheater of described air obtains hot blast to the described environment cold air heating of part, and a part for described hot blast is directly sent into described coal burner as Secondary Air,
A described wind mixing chamber obtains a described wind after environment cold wind described in another part of another part of described hot blast, the weary gas of described heat and another part is mixed,
A described wind and described coal dust are mixed to get described wind powder mixture by described air and powder mixer,
Described drier mixing chamber is taken out mouth with described flue gas respectively and is connected with the weary air preheater of described air, using a part of taking out mouthful described flue gas extracting and the weary gas of described heat from described flue gas is mixed, sends into described raw coal pre-drying device as described drier.
2. according to the weary air dry enclosed powder process coal-burning boiler unit of the stove cigarette reclaiming with weary air water heat described in claim 1, it is characterized in that, also comprise:
Gas cleaning subsystem, comprises: the deduster, air-introduced machine, boiler exhaust gas pipeline, flue gas desulfur device and the chimney that are connected with the weary air preheater of described air,
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 weary air dry enclosed powder process coal-burning boiler of stove cigarette heat reclaiming with weary air water according to claim 1
Unit, 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 that described weary gas is carried, the weary air water recover being connected with described blast pipe road and the collecting-tank that stores described weary air water.
4. the weary air dry enclosed powder process coal-burning boiler unit of stove cigarette heat reclaiming with weary air water according to claim 1, 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 recirculation blast pipe road that the other end is connected with the import of described drier mixing chamber,
Described recirculation blast pipe road enters described drier mixing chamber for the weary pneumatic transmission of Part II that described weary gas is exported to the described weary gas of sending,
The weary gas of described Part II and described drier are mixed for regulating the temperature of described drier.
5. the weary air dry enclosed powder process coal-burning boiler unit of stove cigarette heat reclaiming with weary air water according to claim 1, is characterized in that:
Wherein, described powder process subsystem also comprises that one end is connected with the weary gas outlet of described coal collector, air quantity that the other end is connected with the import of described gas powder generating apparatus regulates pipeline, enters described gas powder generating apparatus and supplement adjusting and enter the air quantity of described gas powder generating apparatus for described weary gas export to the weary pneumatic transmission of Part III of the described weary gas of sending.
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| CN201410472512.8A CN104197359B (en) | 2014-09-16 | 2014-09-16 | With the stove cigarette weary air dry enclosed powder process coal-burning boiler unit of heat that weary air water reclaims |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012069844A2 (en) * | 2010-11-25 | 2012-05-31 | Doosan Power Systems Limited | Low-rank coal processing apparatus and method |
| CN102889609A (en) * | 2011-07-20 | 2013-01-23 | 上海机易电站设备有限公司 | Pulverizing system of smoke drying lignite coal steel ball mill |
| CN203116491U (en) * | 2013-03-18 | 2013-08-07 | 施大钟 | Lignite water take-out lignite efficient burning system |
| WO2014060772A1 (en) * | 2012-10-18 | 2014-04-24 | Doosan Babcock Limited | Fuel preparation apparatus and method |
| CN204114982U (en) * | 2014-09-16 | 2015-01-21 | 上海理工大学 | With the weary air dry enclosed powder process coal-burning boiler unit of stove cigarette heat that weary air water reclaims |
-
2014
- 2014-09-16 CN CN201410472512.8A patent/CN104197359B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012069844A2 (en) * | 2010-11-25 | 2012-05-31 | Doosan Power Systems Limited | Low-rank coal processing apparatus and method |
| CN102889609A (en) * | 2011-07-20 | 2013-01-23 | 上海机易电站设备有限公司 | Pulverizing system of smoke drying lignite coal steel ball mill |
| WO2014060772A1 (en) * | 2012-10-18 | 2014-04-24 | Doosan Babcock Limited | Fuel preparation apparatus and method |
| CN203116491U (en) * | 2013-03-18 | 2013-08-07 | 施大钟 | Lignite water take-out lignite efficient burning system |
| CN204114982U (en) * | 2014-09-16 | 2015-01-21 | 上海理工大学 | With the weary air dry enclosed powder process coal-burning boiler unit of stove cigarette heat that weary air water reclaims |
Non-Patent Citations (1)
| Title |
|---|
| 马有福等: "基于炉烟干燥及水回收风扇磨仓储式制粉系统的高效褐煤发电技术", 《中国电机工程学报》, vol. 33, no. 5, 15 February 2013 (2013-02-15) * |
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