CN104197360A - Fume-dried closed pulverization coal-fired boiler unit with function of exhaust water recovery - Google Patents
Fume-dried closed pulverization coal-fired boiler unit with function of exhaust water recovery Download PDFInfo
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- CN104197360A CN104197360A CN201410472515.1A CN201410472515A CN104197360A CN 104197360 A CN104197360 A CN 104197360A CN 201410472515 A CN201410472515 A CN 201410472515A CN 104197360 A CN104197360 A CN 104197360A
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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-dried closed pulverization coal-fired boiler unit with a function of exhaust water recovery. The fume-dried closed pulverization coal-fired boiler unit is characterized in that a drier mixing chamber is connected with a fume suction opening and a gas outlet of a pulverized coal collector and mixes a first part extracted from exhaust and a part of fume extracted from the fume suction opening into drier which is fed to a raw coal pre-drying device, an 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, an air exhaust preheater heats a part of ambient cold air into hot air and preheats the cold exhaust into hot exhaust, a part of the hot air, the other part of the ambient cold air and the hot exhaust are mixed into primary air, an air-powder mixer mixes the primary air and pulverized coal into air-powder mixture, and the other part of the hot air is used as secondary air which is directly supplied to a pulverized coal burner.
Description
Technical field
The dry enclosed powder process coal-burning boiler unit of the stove cigarette reclaiming with weary air water 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.At worldwide brown coal, account for world's coal gross reserves 40%.China's brown coal account for domestic coal gross reserves 16%, are mainly distributed in area and Yunnan Province that east Inner Mongolia and three provinces in the northeast of China have a common boundary.The brown coal of the Inner Mongol and the Northeast belong to old brown coal, total moisture 25～40%; Yunnan lignite belongs to young brown coal, and total moisture 40～60%, containing wood fibre.In addition, the coal prognostic reserves that are positioned at Xinjiang of China In The Eastern Junggar Basin " accurate eastern coalfield " reach 3,900 hundred million tons, are the self-contained coalfields of China's maximum.Accurate eastern coal is except caloric value is compared with brown coal height, and other coal characteristic is similar to brown coal, also has that moisture is high, volatile matter is high, ash fusion point is low, abrasiveness is low and the feature of easy spontaneous combustion.
For improving brown coal, utilize level, carried out the brown coal drying technical research of various ways both at home and abroad.With the predrying technology of drawing gas that thermal power plant is integrated, steam condensation used heat is predrying for brown coal, can improve in theory 2～4 percentage points of power plant efficiencies, but no matter steam pipe roller drier or in heating steam fluidized-bed process, it between coal grain and steam, is the wall-type heat exchange that heat transfer intensity is lower, therefore drying equipment is bulky, equipment investment and operating cost are very large.Flue gas (or hot-air) dry technology can adopt the forms such as fluid bed, moving bed and gas flow tube, between coal grain and flue gas (or hot-air), it is the mixing heat-exchange that heat transfer intensity is higher, but the dry safety in operation of flue gas (or hot-air) is poor, drying system easily catches fire, and needs strict desiccant temperature and the oxygen content controlled.Mechanical/thermal press-dehydrating and heating power dehydration are non-evaporation drying technology, thereby to be energy consumption for drying low and can remove a part of alkali metal material improves boiler scaling and contamination for advantage, but dehydration conditions is HTHP, and equipment enlarging is more difficult, and the intractability of dewatering system waste discharge is larger.Due to easily cracked easy spontaneous combustion of brown coal, the moulding of dry rear brown coal and safe storage transportation are also comparatively difficult.Visible, all there is distinctive difficulty in current all kinds of brown coal drying technology, still needs further research with perfect before scale application.
Brown coal moisture is high, calorific value is low and easy spontaneous combustion, therefore unsuitable long distance transportation.The main path that brown coal utilize is at present still by electric power stations near coal-mines combustion power generation, then transmits electric power to the area of needs.And the installed capacity of Chinese large-sized combustion brown coal generating sets (single-machine capacity >=200MW) only accounts for 3% left and right of national thermoelectricity total installation of generating capacity, far below brown coal shared ratio (16%) in coal gross reserves.So along with the ratio of High Quality Tobacco coal reserves constantly declines, development brown coal unit is significant to China's Sustainable Development of Power Industry.
At present existing many 600MW level brown coal units of China put into operation, and all configure unit pulverized-coal system boiler.But compare with conventional bituminous coal fired boiler, the thermal efficiency lower (approximately low 2 percentage points) and the price of these boiler using brown coals are higher, this is main because the inner flue gas of the stove amount in boiler using brown coal is larger, thereby boiler exhaust gas heat loss is higher, and boiler volume is also larger.In addition, the unit pulverized-coal system of high-moisture fire coal needs extracting high-temperature stove cigarette as pulverized coal preparation system drier key component, and this makes to contain the inert gases such as a large amount of stove cigarettes and steam in a wind, causes Boiler Stable Combustion also comparatively difficult.
In addition, thermal power plant is water for industrial use rich and influential family, and China's brown coal producing region (for example Eastern Inner Mongolia) belongs to areas of serious mostly, and water resources shortage becomes the important restriction factor of the near coal-mine power supply construction of base of impact.Obviously, in the flue gas of high-moisture coal-burning boiler, contain and have great lot of water resources, realizing the recycling of moisture in coal-fired flue-gas becomes a problem demanding prompt solution.
Summary of the invention
The present invention carries out in order to address the above problem, 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 dry enclosed powder process coal-burning boiler unit of the stove cigarette reclaiming with weary air water of high efficiency generating.
The invention provides the dry enclosed powder process coal-burning boiler unit of a kind of stove cigarette 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 is positioned at the exhanst gas outlet of burner hearth is taken out mouth, air-supply powder feeding subsystem comprises: air and powder mixer, be positioned at the weary air preheater of air of flue afterbody, for the pressure fan of environment cold wind is provided, the cold weary gas blower fan and the wind mixing chamber that are connected with the weary air preheater air inlet of air, weary air water reclaims subsystem and comprises: the weary air water retracting device being connected with the gas vent of coal collector, the drier that raw coal pre-drying device is used to self-desiccation agent mixing chamber carries out predrying to raw coal, gas powder generating apparatus obtains primary mixture after the raw coal after predrying being ground and being further dried, coal collector carries out separation to primary mixture and obtains coal dust and weary gas, Pulverized Coal Bin stores coal dust, machine supplying powder is for measuring and regulate the boiler coal feeding amount that flows to air and powder mixer of controlling, air and powder mixer is mixed to get wind powder mixture to wind from air-supply powder feeding subsystem and coal dust, coal burner burns to the coal dust in wind powder mixture, coal dust generates flue gas in the internal-combustion of burner hearth, drier mixing chamber is taken out mouth with flue gas respectively and is connected with the gas vent of coal collector, after mixing with a part for flue gas, the weary gas of the first extracting delivers to raw coal pre-drying device as drier in weary gas, weary air water retracting device is introduced the weary gas of the second portion in weary gas the moisture in the weary gas of this second portion is reclaimed, the weary gas of second portion obtains cold weary gas after the condensation of weary air water retracting device, cold weary gas enters in the weary air preheater of air by cold weary gas blower fan, the weary air preheater of air adds thermosetting hot blast and cold weary gas is added to the weary gas of thermosetting heat a part for environment cold wind, a part for this hot blast is directly sent into coal burner as Secondary Air, a wind mixing chamber is for the another part to hot blast, after mixing, another part of environment cold wind and hot weary gas obtains wind one time, air and powder mixer is mixed to get wind powder mixture by wind and coal dust, drier mixing chamber is sent into raw coal pre-drying device the weary gas of first is mixed with a part of taking out the flue gas of mouth extraction from flue gas.
In the dry enclosed powder process coal-burning boiler unit of the stove cigarette 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 dry enclosed powder process coal-burning boiler unit of the stove cigarette reclaiming with weary air water provided by the invention, can also there is such feature: wherein, weary air water retracting device comprises: is connected with the gas vent of coal collector, and the blast pipe road that weary gas is carried, the weary air water recover being connected with blast pipe road and the collecting-tank that stores weary air water.
In the dry enclosed powder process coal-burning boiler unit of the stove cigarette 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 air quantity that the other end is connected with the import of gas powder generating apparatus regulates pipeline, enters gas powder generating apparatus supplement the air quantity that adjusting enters gas powder generating apparatus for the weary pneumatic transmission of third part that weary gas outlet is sent.
Effect and the effect of invention
In the dry enclosed powder process coal-burning boiler unit of the stove cigarette 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, in weary gas steam volume share high be that water dew point is high, so condensed and obtained water by weary gas lowered temperature reclamation, this has improved the exploitativeness that in flue gas, moisture reclaims greatly.And, in the present invention, usining near the flue gas of the high temperature that extracts furnace outlet and the weary gas of recirculation mixes afterwards formed mixture as powder process subsystem drier, can further improve weary gas water capacity and water dew point and make the moisture in weary gas can effectively be recovered more economically utilization, thereby also make drier oxygen content significantly reduce simultaneously, improve 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 obtains hot weary gas after the weary air preheater heating of air, the weary gas of heat and a part of hot blast and another part environment cold wind are mixed to get one time wind in a wind mixing chamber, a this wind oxygen content is low, can avoid coal dust to burn in powder feeding pipes, 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, this makes also abundant after-flame in burner hearth of the volatile matter that may contain in weary gas, thereby has guaranteed the efficiency of combustion of raw coal.And, because the volatile matter that may separate out in pulverizing process enters in burner hearth and after-flame with a wind, so needn't be for fear of Volatile in enclosed powder process unit and in strictly controlling gas powder generating apparatus coal pulverizer outlet temperature in lower value, 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 evaporate the major part of moisture in coal from powder process subsystem, because reclaiming, weary air water no longer enters burner hearth, 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, 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.
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 the higher dry enclosed powder process coal-burning boiler unit of the stove cigarette reclaiming with weary air water of unit generation efficiency.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of electricity generation system in the embodiment of the present invention;
Fig. 2 is dried the structured flowchart of enclosed powder process coal-burning boiler unit with the stove cigarette of weary air water recovery in the embodiment of the present invention;
Fig. 3 is dried the construction module schematic diagram of enclosed powder process coal-burning boiler unit with the stove cigarette of weary air water recovery 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 dried the structural representation of enclosed powder process coal-burning boiler unit with the stove cigarette of weary air water recovery in the embodiment of the present invention.
The specific embodiment
For technological means, creation characteristic that the present invention is realized, reach object and effect is easy to understand, following examples are specifically addressed the dry enclosed powder process coal-burning boiler unit of the stove cigarette 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 stove cigarette dry enclosed powder process coal-burning boiler unit 501, Steam Turbine 502 and the generating set 503 that with weary air water, reclaim.
The heat that raw coal produces afterwards in the dry enclosed powder process coal-burning boiler unit 501 interior burnings of the stove cigarette reclaiming with weary air water is for heating water, water enters Steam Turbine 502 actings after adding the steam of thermosetting HTHP, and then Steam Turbine 502 drives generating sets 503 to generate electricity.
Fig. 2 is dried the structured flowchart of enclosed powder process coal-burning boiler unit with the stove cigarette of weary air water recovery in the embodiment of the present invention.
As shown in Figure 2, the dry enclosed powder process coal-burning boiler unit 501 of stove cigarette reclaiming with weary air water is for burning to raw coal 60.The dry enclosed powder process coal-burning boiler unit 501 of stove cigarette 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.
Air-supply 403 pairs of environment cold wind 61 of powder feeding subsystem and cold weary gas are processed and are formed a wind, 401 pairs of raw coal 60 of a wind and powder process subsystem grind after the coal dust obtaining mixes by a certain percentage to be sent 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, be separated in weary gas with a large amount of steam, most of wet weary gas enters weary air water recovery subsystem 404 and carries out cooling, 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, the cold weary gas weary gas of the pre-thermosetting of powder feeding subsystem 403 heat of being blown, the weary gas of this heat mixes in air-supply powder feeding subsystem 403 with hot blast and environment cold wind, after mixing, entering boiler body subsystem 402 burns.
Fig. 3 is the construction module schematic diagram of the dry enclosed powder process coal-burning boiler unit of the stove cigarette reclaiming with weary air water in the embodiment of the present invention.
As shown in Figure 3, powder process subsystem 401 obtains coal dust for raw coal is ground to 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 50 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 reclaims subsystem 404 with powder process subsystem 401, weary air water respectively and is connected with boiler body subsystem 402, for the coal dust that powder process subsystem 401 is obtained, send into boiler body subsystem 402, to boiler body subsystem 402, provide wind regime simultaneously.Air-supply powder feeding subsystem 403 comprises: pressure fan 29, air supply duct 30, the weary air preheater 48 of air, first cooling by wind wind pipeline 35, wind-heat wind pipeline 36, Secondary Air hot air duct 37, secondary air bellow 38, wind mixing chamber 39, wind pipeline 40, booster fan 41, wind bellows 42, air and powder mixer 10, powder feeding pipes 11, cold weary gas blower fan 49, hot blast pipe road 53.The outlet in cold blast pipe road 28 is connected with the air inlet of cold weary gas blower fan 49, and the one end in hot blast pipe road 53 is connected with the air outlet of the weary air preheater 48 of air, and the other end is connected with a wind mixing chamber 39.
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 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.
The annexation of dry enclosed powder process coal-burning boiler unit 501 integral body of stove cigarette 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 50 to be connected with blower mill 4 by air quantity, also by recirculation blast pipe road 23, be connected with the import of drier mixing chamber 20.
In boiler body subsystem 402, coal burner 12 is positioned at burner hearth 13a, and flue gas is taken out the top that mouth 19 is arranged on boiler 13, and the outlet flue that flue gas is taken out mouth 19 is connected with the drier mixing chamber 20 in powder process subsystem 401.
At weary air water, reclaim in subsystem 404, weary air water recover 25 is connected with the gas outlet of 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 of the weary gas being reclaimed by weary air water recover 25, the cold weary gas after the moisture reclaiming in weary gas through weary air water recover 25 is discharged in the weary air preheater 48 of air through cold blast pipe road 28.
In air-supply powder feeding subsystem 403, the air outlet of pressure fan 29 is connected with the weary air preheater 48 of air by air supply duct 30, the hot blast of the weary air preheater 48 of air divides two-way, the Secondary Air hot air duct 37 of leading up to is connected and enters in coal burner 12 with secondary air bellow 38, the wind-heat wind pipeline 36 of separately leading up to being in parallel is connected with a wind mixing chamber 39, a wind mixing chamber 39, a wind pipeline 40, a booster fan 41, one time wind bellows 42 connect in turn, air and powder mixer 10 imports are connected with wind bellows 42 with machine supplying powder 9 respectively, air and powder mixer 10 connects 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 outlets are connected with air-introduced machine 15 imports, air-introduced machine 15 outlets are connected with flue gas desulfur device 17 imports by boiler exhaust gas pipeline 16, and flue gas desulfur device 17 outlets are connected with chimney 18.
Fig. 4 is the block diagram of powder feeding subsystem of blowing in the embodiment of the present invention.
The flow process of air: as shown in Figure 3, Figure 4, a part for 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, another part of environment cold wind 61 enters wind mixing chamber 39 by pressure fan 29 one time through first cooling by wind wind pipeline 35, the hot blast major part of the air side outlet of the weary air preheater 48 of air is introduced secondary air bellow 38 as Secondary Air through Secondary Air hot air duct 37, and is distributed and drawn toward coal burner 12 from secondary air box 38.Another small part hot blast is introduced a wind mixing chamber 39 through a wind-heat wind pipeline 36.Weary gas blower fan 49 is introduced cold weary gas in the weary air preheater 48 of air and is added the weary gas of thermosetting heat, and hot weary gas is sent in a wind mixing chamber 39 through overheated blast pipe road 53.At an interior hot blast of wind mixing chamber 39, environment cold wind also has hot weary gas to mix by a certain percentage, by the flow of the flow of adjusting ambient cold wind and the hot blast of inflow mixed once chamber 39, regulate the temperature of a wind, regulate the temperature of this wind until a required air temperature of coal dust safe transport and smooth combustion, a wind of wind mixing chamber 39 outlets enters in supercharging primary air fan 41 through a wind-heat wind pipeline 40, after being pressurized, be sent to wind bellows 42 one time, from wind bellows 42, distribute and draw toward air and powder mixer 10 again, and then by flowing of a wind, coal dust is sent in burner hearth 13a and burnt.
Fig. 5 is dried the structural representation of enclosed powder process coal-burning boiler unit with the stove cigarette of weary air water recovery in the embodiment of the present invention.
The operation principle of the dry enclosed powder process coal-burning boiler unit 501 of stove cigarette 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, mix and descending the predrying of raw coal that complete with the drier from drier mixing chamber 20, blower mill 4 will be ground into coal dust by the dried coal of raw coal pre-drying device 3, coal dust will further be dried simultaneously.The weary gas of blower mill 4 outlets (gas of blower mill 4 outlets is called weary gas) enters mill separator 5 with the mixture of coal dust, 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, by the qualified coal dust of mill separator 5 and the mixture of weary gas, through powder process pipeline 6, enter coal collector 7, coal collector 7 carries out separated by 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 machine supplying powder 9, in air and powder mixer 10, mix with a wind facies from wind bellows 42, then by powder feeding pipes 11, be sent to coal burner 12 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 weary air preheater 48 fume side outlets of air are discharged is introduced boiler induced-draft fan 15 after deduster 14 purifies, and through the smoke discharging pipe 16 of air-introduced machine 15 outlet, enter flue gas desulfur device 17, through the flue gas 62 of desulfurizing and purifying by chimney 18 discharged to atmospheric environment.
Drier flow process: take out mouthfuls 19 high-temperature flue gas that extract and weary gas from recirculation blast pipe road 23 required drier in being mixed to get powder process subsystem 401 in drier mixing chamber 20 by flue gas, this drier enters raw coal pre-drying device 3 via drier pipeline 21, thereby drier mixes with coal and descendingly to coal, carries out predrying in raw coal pre-drying device 3.
Weary air-flow journey: drier, the powder process subsystem 401 of weary gas origin self-desiccation agent mixing chamber 20 leaks out and the transpiring moisture of coal forms.Weary gas carries out separated with coal dust in coal collector 7, isolated weary gas is extracted out by weary gas blower fan 22 and is divided into three parts, the weary gas of first is sent into drier mixing chamber 20 as drier temperature control medium by recycling blast pipe road 23, the weary gas of third part regulates pipeline 50 to enter blower mill 4 by air quantity, to entering the air quantity of blower mill 4, supplement, the weary gas of second portion i.e. wet weary gas is sent into weary air water recover 25 through blast pipe road 24.Moisture in the weary gas of second portion is cooled by refrigerant 80 weary air water recover 25 is interior, thereby obtains a large amount of aqueous waters, and aqueous water combines in collecting-tank 27.The cold weary gas that weary air water recovery system 25 is discharged carries out preheating by cold weary gas blower fan 49 and obtains hot weary gas in the weary air preheater 48 of cold blast pipe road 28 introducing air, after mixing with a part for environment cold wind, a part of hot blast, the weary gas of heat forms a wind, by the flow of adjusting ambient cold wind, can regulate the temperature of a wind, wind and coal dust enter burner hearth 13a burning, thereby the weary gas of heat in a wind melts down and participates in burning and can guarantee that the abundant after-flame of the volatile matter that may contain in weary gas guarantees the efficiency of combustion of raw coal 60.
The effect of embodiment and effect
In the dry enclosed powder process coal-burning boiler unit of the related stove cigarette reclaiming with weary air water of 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 high-moisture coal pulverizing system 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.
And, using the flue gas of high temperature and the mixture of the weary gas of recirculation as powder process subsystem drier, make the oxygen content of drier compare obviously less with conventional dry drying prescription, thereby obviously reduced the risk of coal combustion explosion in flour mill flow, and the flow that can recycle weary gas by adjusting regulates desiccant temperature easily, thereby guarantee that coal pulverizer outlet temperature is within suitable scope.Using the weary gas mixing of high-temperature flue gas and recirculation as drier, can further improve weary gas water capacity and water dew point, thereby weary air water is reclaimed more easily, realize.
And, the weary gas forming in powder process subsystem obtains cold weary gas after reclaiming the moisture in weary gas by weary air water retracting device, cold weary gas forms hot weary gas after the weary air preheater preheating of air, the weary gas of heat and a part of hot blast and another part environment cold wind are mixed to get wind one time at a wind mixing chamber, a this wind oxygen content is low, can avoid coal dust to burn in powder feeding pipes, 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 guaranteed the efficiency of combustion of raw coal.And, 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 pulverized coal preparation system 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 further increase the water yield reclaiming from weary gas.
And, because evaporate moisture major part in producing coal from powder process subsystem, no longer enter burner hearth after reclaiming because of weary air water, 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 is recovered and reduces in weary air water retracting device, thereby boiler exhaust gas heat loss reduces, the corresponding raising of boiler thermal output.
And, by being set, wind mixing chamber can regulate easily air temperature and primary air ratio, thereby guarantee powder feeding safety and breeze airflow combustion stability, one time wind mixing chamber is mixed to form wind one time by the weary gas of heat, component environment cold wind and part hot blast, and the temperature of a wind can be regulated by the flow of adjusting portion time-sharing environment cold wind and the flow of part hot blast.By adjusting, recycle weary tolerance and can regulate easily desiccant temperature, thereby guarantee the predrying effect of high-temperature flue gas to raw coal in raw coal pre-drying device.By coal pulverizer air quantity is set, regulate pipeline, can make coal pulverizer work under optimal ventilation amount, thereby guarantee pulverizer capacity and reduce powder process power consumption.
To sum up, embodiment can provide a kind of green high-efficient coal-burning boiler system, solved the unsettled problem of high-moisture coal-fired boiler combustion, reduced the coal-grinding power consumption of coal pulverizer, overcome the inefficient shortcoming of traditional high-moisture coal-fired boiler hot, when significantly improving boiler thermal output and unit generation efficiency, powder process subsystem moves the safety in operation that has improved high volatile coal powder process subsystem under inerting atmosphere, the weary gas water capacity of powder process subsystem and water dew point have obviously been improved, 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 dry enclosed powder process coal-burning boiler unit of the involved in the present invention stove cigarette reclaiming with weary air water 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 (4)
1. the dry enclosed powder process coal-burning boiler unit of stove cigarette reclaiming with weary air water, for raw coal is burnt, 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: be provided with burner hearth boiler, the flue being connected with the afterbody of described burner hearth, be positioned at the coal burner of described burner hearth entry position and near be positioned at the exhanst gas outlet of described burner hearth flue gas is taken out mouth,
Described air-supply powder feeding subsystem comprises: air and powder mixer, be positioned at the weary air preheater of air of described flue afterbody, for the pressure fan of environment cold wind, cold weary gas blower fan and the wind mixing chamber being connected with the weary air preheater air inlet of described air 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 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 controls for measuring and regulating the coal-supplying amount that flows to described air and powder mixer,
Described air and powder mixer is mixed to get wind powder mixture to wind from described air-supply powder feeding subsystem and described coal dust,
Described coal burner burns to the described coal dust in described wind powder mixture,
Described coal dust generates flue gas in the internal-combustion of described burner hearth,
Described drier mixing chamber is taken out mouth with described flue gas respectively and is connected with the gas vent of described coal collector, after the weary gas of first extracting in described weary gas mixes with a part for described flue gas, as described drier, delivers to described raw coal pre-drying device,
Described weary air water retracting device is introduced the weary gas of the second portion in described weary gas the moisture in the weary gas of this second portion is reclaimed, and the weary gas of described second portion obtains cold weary gas after the condensation of described weary air water retracting device,
Described cold weary gas enters in the weary air preheater of air by described cold weary gas blower fan,
A part for described environment cold wind is added to thermosetting hot blast to the weary air preheater of described air and to the weary gas of the pre-thermosetting heat of described cold weary gas, a part for this hot blast is directly sent into described coal burner as Secondary Air,
A described wind mixing chamber obtains a described wind after another part of another part of described hot blast, described environment cold wind and the weary gas of described heat are mixed,
Described air and powder mixer is mixed to get described wind powder mixture by a described wind and described coal dust,
Described drier mixing chamber is sent into described raw coal pre-drying device the weary gas of described first is mixed with a part of taking out the described flue gas of mouth extraction from described flue gas.
2. according to the dry enclosed powder process coal-burning boiler unit of the stove cigarette reclaiming with weary air water 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 stove cigarette reclaiming with weary air water according to claim 1 is dried enclosed powder process coal-burning boiler unit, it is characterized in that:
Wherein, described weary air water retracting device comprises: the collecting-tank that is connected the blast pipe road that described weary gas is carried, the weary air water recover being connected with described blast pipe road with the gas vent of described coal collector and stores moisture in described weary gas.
4. the stove cigarette reclaiming with weary air water according to claim 1 is dried enclosed powder process coal-burning boiler unit, it is characterized in that:
Wherein, described powder process subsystem also comprises that one end is connected with the weary gas outlet of described coal collector, the air quantity that the other end is connected with the import of described gas powder generating apparatus regulates pipeline, enters described gas powder generating apparatus supplement the air quantity that adjusting enters described gas powder generating apparatus for the weary pneumatic transmission of third part that described weary gas outlet is sent.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410472515.1A CN104197360B (en) | 2014-09-16 | 2014-09-16 | With the furnace smoke drying enclosed powder process coal-burning boiler unit that weary air water reclaims |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410472515.1A CN104197360B (en) | 2014-09-16 | 2014-09-16 | With the furnace smoke drying enclosed powder process coal-burning boiler unit that weary air water reclaims |
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| CN104197360B CN104197360B (en) | 2016-06-08 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104910938A (en) * | 2015-05-15 | 2015-09-16 | 石家庄新华能源环保科技股份有限公司 | Device for recovering water in coal |
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| CN102798132A (en) * | 2011-05-27 | 2012-11-28 | 中国电力工程顾问集团东北电力设计院 | Fan mill front counter flow type furnace-smoke drying dewatering direct blowing pulverization system |
| US20140013746A1 (en) * | 2011-03-25 | 2014-01-16 | Tsukishima Kikai Co., Ltd. | Coal-fired power generating system and coal-fired power generating method |
| CN204114984U (en) * | 2014-09-16 | 2015-01-21 | 上海理工大学 | With the stove cigarette dry enclosed powder process coal-burning boiler unit that weary air water reclaims |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140013746A1 (en) * | 2011-03-25 | 2014-01-16 | Tsukishima Kikai Co., Ltd. | Coal-fired power generating system and coal-fired power generating method |
| CN202229208U (en) * | 2011-05-27 | 2012-05-23 | 中国电力工程顾问集团东北电力设计院 | Furnace smoke drying and water recycling warehouse-type fan mill hot air powder supplying and making system |
| CN102798132A (en) * | 2011-05-27 | 2012-11-28 | 中国电力工程顾问集团东北电力设计院 | Fan mill front counter flow type furnace-smoke drying dewatering direct blowing pulverization system |
| CN204114984U (en) * | 2014-09-16 | 2015-01-21 | 上海理工大学 | With the stove cigarette dry enclosed powder process coal-burning boiler unit that weary air water reclaims |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104910938A (en) * | 2015-05-15 | 2015-09-16 | 石家庄新华能源环保科技股份有限公司 | Device for recovering water in coal |
| CN104910938B (en) * | 2015-05-15 | 2017-08-01 | 石家庄新华能源环保科技股份有限公司 | The device that a kind of moisture in coal is reclaimed |
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| CN104197360B (en) | 2016-06-08 |
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