CN104197360B - With the furnace smoke drying enclosed powder process coal-burning boiler unit that weary air water reclaims - Google Patents
With the furnace smoke drying enclosed powder process coal-burning boiler unit that weary air water reclaims Download PDFInfo
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- CN104197360B CN104197360B CN201410472515.1A CN201410472515A CN104197360B CN 104197360 B CN104197360 B CN 104197360B CN 201410472515 A CN201410472515 A CN 201410472515A CN 104197360 B CN104197360 B CN 104197360B
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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 kind of furnace smoke drying enclosed powder process coal-burning boiler unit reclaimed with weary air water, it is characterized in that, including: desiccant mixing chamber is taken out the gas outlet of mouth and coal collector respectively and is connected with flue gas, raw coal pre-drying device is delivered to as desiccant after being mixed with the part taking out the flue gas that mouth extracts from flue gas by the weary gas of Part I extracted in weary gas, the height that powder process subsystem is discharged by weary air water retracting device cools down thus obtaining a large amount of condensation water and discharging cold weary gas containing wet weary gas, a part of environment cold wind is heated obtaining hot blast and cold weary gas is carried out preheating obtaining hot weary gas by the weary air preheater of air, a part for hot blast, as First air after another part environment cold wind and the weary gas mixing of heat, First air and coal dust are carried out being mixed to get wind powder mixture by air and powder mixer, another part of hot blast is sent directly into coal burner as secondary wind.
Description
Technical field
The present invention relates to the furnace smoke drying enclosed powder process coal-burning boiler unit reclaimed with weary air water of a kind of coal fired power plant, be specifically related to boiler air-supply, powder process, coal dust firing and flue gas water reclamation technology.
Background technology
Brown coal have moisture height, volatile matter is high, caloric value is low, ash fusion point is low, abrasiveness is low and the feature such as easy spontaneous combustion. World's coal gross reserves 40% is accounted at worldwide brown coal. China's brown coal account for domestic coal gross reserves 16%, are mainly distributed on area and the Yunnan Province of east Inner Mongolia and boundary, three provinces in the northeast of China. 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. Additionally, the coal prognostic reserves being positioned at Xinjiang of China In The Eastern Junggar Basin " quasi-east coalfield " reach 390,000,000,000 tons, it it is the maximum self-contained coalfield of China. Quasi-east coal is except caloric value relatively brown coal height, and other coal characteristic is similar to brown coal, it may have 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, carry out the brown coal drying technical research of various ways both at home and abroad. It is predrying that steam condensation used heat is used for brown coal by the draw gas predrying technology integrated with thermal power plant, power plant efficiency 2��4 percentage points can be improved in theory, but no matter steam pipe roller drier or in add vapours fluidized-bed process, it it is the relatively low wall-type heat exchange of heat transfer intensity between coal grain and steam, therefore drying equipment is bulky, equipment investment and operating cost are very big. Flue gas (or hot-air) dry technology can adopt the forms such as fluid bed, moving bed and gas flow tube, it is the mixing heat-exchange that heat transfer intensity is higher between coal grain and flue gas (or hot-air), but the dry safety in operation of flue gas (or hot-air) is poor, drying system easily catches fire, and need to strictly control desiccant temperature and oxygen content.Mechanical/thermal press-dehydrating and Thermal dehydration are non-evaporation drying technology, advantage is that energy consumption for drying is low and can remove a part of alkali species thus improving boiler scaling and contamination, but dehydration conditions is High Temperature High Pressure, and equipment enlarging is relatively difficult, and the intractability of dewatering system waste discharge is bigger. Owing to the brown coal easy spontaneous combustion of easy fragmentation, the molding of dried 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 to research further with perfect before scale is applied.
Brown coal moisture is high, calorific value is low and easy spontaneous combustion, therefore unsuitable long distance transportation. The main path that current brown coal utilize is still by electric power stations near coal-mines combustion power generation, then transmits electric power to the area needed. And the installed capacity of Chinese large-sized combustion brown coal generating set (single-machine capacity >=200MW) only accounts for about the 3% of whole nation thermoelectricity total installation of generating capacity, far below the ratio (16%) that brown coal are shared in coal gross reserves. So, along with the ratio of High Quality Tobacco coal reserves constantly declines, development lignite-fired unit is significant to China's Sustainable Development of Power Industry.
China's existing multiple stage 600MW level lignite-fired unit at present puts into operation, all configuration unit pulverized-coal system boilers. But compared with conventional bituminous coal fired boiler, the thermal efficiency relatively low (about low 2 percentage points) of these boiler using brown coals and price are higher, this is main because of the inner flue gas of the stove amount in boiler using brown coal relatively greatly, thus boiler exhaust gas heat loss is higher, and boiler volume is also bigger. Additionally, the unit pulverized-coal system of high-moisture fire coal needs extracting high-temperature stove cigarette as pulverized coal preparation system desiccant key component, this makes in First air containing the noble gas such as a large amount of stove cigarettes and steam, causes Boiler Stable Combustion also comparatively difficult.
It addition, thermal power plant is water for industrial use rich and influential family, and China's brown coal producing region (such as Eastern Inner Mongolia) belongs to areas of serious mostly, and water resources shortage becomes the important restriction factor affecting near coal-mine power supply construction of base. Obviously, the flue gas of high-moisture coal-burning boiler contains there is great lot of water resources, it is achieved in coal-fired flue-gas, the recycling of moisture becomes a problem demanding prompt solution.
Summary of the invention
The present invention carries out to solve the problems referred to above, purpose is in that to provide a kind of can not only realization that the large quantity of moisture in milling waste steam processed is recycled, and can also realize the furnace smoke drying enclosed powder process coal-burning boiler unit reclaimed with weary air water of high efficiency generating.
The present invention provides a kind of furnace smoke drying enclosed powder process coal-burning boiler unit reclaimed with weary air water, it is characterized in that, including: 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 being sequentially connected with, gas powder generates device, coal collector, Pulverized Coal Bin, machine supplying powder and the desiccant mixing chamber being connected with raw coal pre-drying device, boiler body subsystem comprises: be provided with the boiler of burner hearth, the flue being connected with the afterbody of burner hearth, it is positioned at the coal burner of burner hearth entry position and is positioned at the flue gas near the exhanst gas outlet of burner hearth and takes out mouth, air-supply powder feeding subsystem comprises: air and powder mixer, it is positioned at the weary air preheater of air of flue afterbody, for providing the pressure fan of environment cold wind, the cold weary gas blower fan being connected with air weary air preheater air inlet and First air mixing chamber, weary air water reclaims subsystem and comprises: the weary air water retracting device being connected with the gas outlet of coal collector, raw coal pre-drying device utilizes the desiccant from desiccant mixing chamber to carry out predrying to raw coal, gas powder generates after the raw coal after predrying is ground and is further dried by device and obtains primary mixture, primary mixture is easily separated and obtains coal dust and weary gas by coal collector, coal dust is stored by Pulverized Coal Bin, machine supplying powder is for measuring and regulable control flows to the boiler coal feeding amount of air and powder mixer, First air and coal dust from air-supply powder feeding subsystem is mixed to get wind powder mixture by air and powder mixer, coal dust in wind powder mixture is burnt by coal burner, coal dust generates flue gas in the internal-combustion of burner hearth, desiccant mixing chamber is taken out the gas outlet of mouth and coal collector respectively and is connected with flue gas, raw coal pre-drying device is delivered to as desiccant after being mixed with a part for flue gas by the weary gas of Part I extracted in weary gas, weary for Part II in weary gas gas is introduced and is reclaimed by the moisture in weary for this Part II gas by weary air water retracting device, the weary gas of Part II obtains cold weary gas after weary air water retracting device condenses, cold weary gas enters in the weary air preheater of air by cold weary gas blower fan, a part for environment cold wind is thermally formed hot blast and cold weary gas is thermally formed hot weary gas by the weary air preheater of air, a part for this hot blast is sent directly into coal burner as secondary wind, First air mixing chamber is for the another part to hot blast, another part of environment cold wind and the weary gas of heat obtain First air after mixing, First air and coal dust are carried out being mixed to get wind powder mixture by air and powder mixer, desiccant mixing chamber sends into raw coal pre-drying device after being mixed with the part taking out the flue gas that mouth extracts from flue gas by weary for Part I gas.
In the furnace smoke drying enclosed powder process coal-burning boiler unit reclaimed with weary air water provided by the invention, have the feature that, also include: gas cleaning subsystem, comprise: cleaner unit, air-introduced machine, boiler exhaust gas pipeline, flue gas desulfurization device and the chimney being connected with the weary air preheater of air, the outlet of air-introduced machine is connected by the import of boiler exhaust gas pipeline with flue gas desulfurization device, and the outlet of flue gas desulfurization device is connected with chimney.
In the furnace smoke drying enclosed powder process coal-burning boiler unit reclaimed with weary air water provided by the invention, can also have a feature in that wherein, weary air water retracting device includes: be connected with the gas outlet of coal collector, the blast pipe road that weary gas is carried, the weary air water withdrawer being connected with blast pipe road and the collecting-tank storing weary air water.
In the furnace smoke drying enclosed powder process coal-burning boiler unit reclaimed with weary air water provided by the invention, can also have a feature in that wherein, powder process subsystem also includes one end and is connected with the weary gas outlet of coal collector, the other end generates the air quantity adjustment pipeline that the import of device is connected with gas powder, is used for that the weary pneumatic transmission of Part III that the outlet of weary gas is sent enters gas powder generation device and supplements the air quantity regulating entrance gas powder generation device.
The effect of invention and effect
In the furnace smoke drying enclosed powder process coal-burning boiler unit reclaimed with weary air water of the present invention, because coal collector makes coal dust and weary gas separated at coal collector, and weary gas is 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 height and water dew point are high, obtaining water so being condensed by weary gas lowered temperature reclamation, which greatly enhances the exploitativeness that in flue gas, moisture reclaims. And, the mixture that the flue gas of high temperature extracted near furnace outlet in the present invention and the weary gas of recirculation are formed after mixing is as powder process subsystem desiccant, can further improve weary gas water capacity and water dew point makes the moisture in weary gas to be effectively recycled more economically, also making desiccant oxygen content be greatly reduced thus improving pulverized coal preparation system safety in operation simultaneously.
And, the weary gas formed 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 of air heats, the weary gas of heat is mixed to get First air with a part of hot blast and another part environment cold wind in First air mixing chamber, this First air oxygen content is low, coal dust can be avoided to burn in powder feeding pipes, thus conveying high volatile coal dust is to coal burner safely. Meanwhile, this hypoxic First air can adopt higher powder feeding temperature, thus significantly improving the combustion stability of breeze airflow. And, after adopting above-mentioned powder process subsystem, the burner hearth flame temperature of boiler can increase, and further enhances catching fire and after-flame performance of breeze airflow.
Further, because have employed enclosed powder process, namely weary gas melts down participation burning, this make weary gas is likely to containing volatile matter also abundant after-flame in burner hearth, thus ensure that the efficiency of combustion of raw coal. And, because the volatile matter being likely to precipitate out in pulverizing process enters in burner hearth with First air and after-flame, so it is unnecessary to avoid Volatile in enclosed powder process unit and strictly controlling gas powder and generate in device pulverizer outlet temperature in lower value, pulverizer outlet temperature can appropriateness improve, this significantly reduces requirement powder process subsystem being run and controlling on the one hand, reduce so that more moisture in coal are evaporated in weary gas because coal dust moisture raises with pulverizer outlet temperature on the other hand, thus further increasing the water yield reclaimed from weary gas.
And, because the major part evaporating moisture in coal from powder process subsystem does not enter back into burner hearth because weary air water reclaims, and the cold smoke extracted by air-introduced machine exhaust pass is no longer at boiler internal recycle, the exhaust gas volumn flowing through back-end ductwork and the weary air preheater of air in boiler is significantly reduced, cigarette/edema due to wind pathogen equivalent proportion that result is the weary air preheater of air reduces, and namely the weary air preheater outlet exhaust gas temperature of air reduces.In addition boiler exhaust gas amount also reduces because a part of steam reclaims in weary air water retracting device, thus boiler exhaust gas heat loss reduces, and boiler thermal output improves accordingly.
Therefore, the present invention can provide a kind of not only realize the moisture in weary gas is reclaimed and recycled can also realize boiler thermal output and the in hgher efficiency furnace smoke drying enclosed powder process coal-burning boiler unit reclaimed with weary air water of unit generation.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of electricity generation system in the embodiment of the present invention;
Fig. 2 is the structured flowchart of the furnace smoke drying enclosed powder process coal-burning boiler unit reclaimed with weary air water in the embodiment of the present invention;
Fig. 3 is the construction module schematic diagram of the furnace smoke drying enclosed powder process coal-burning boiler unit reclaimed with weary air water in the embodiment of the present invention;
Fig. 4 is the block diagram of air-supply powder feeding subsystem in the embodiment of the present invention; And
Fig. 5 is the structural representation of the furnace smoke drying enclosed powder process coal-burning boiler unit reclaimed with weary air water in the embodiment of the present invention.
Detailed description of the invention
For the technological means making the present invention realize, creation characteristic, reaching purpose and effect and be easy to understand, the furnace smoke drying enclosed powder process coal-burning boiler unit reclaimed with weary air water of the present invention is specifically addressed by following example in conjunction with accompanying drawing.
Fig. 1 is the structured flowchart of electricity generation system in the embodiment of the present invention.
As it is shown in figure 1, electricity generation system 100 includes: furnace smoke drying enclosed powder process coal-burning boiler unit 501, Steam Turbine 502 and the generating set 503 reclaimed with weary air water.
The heat that raw coal produces after burning in the furnace smoke drying enclosed powder process coal-burning boiler unit 501 reclaimed with weary air water is for being heated water, water enters Steam Turbine 502 after being thermally formed the steam of High Temperature High Pressure and does work, and then Steam Turbine 502 drive electrical generators group 503 generates electricity.
Fig. 2 is the structured flowchart of the furnace smoke drying enclosed powder process coal-burning boiler unit reclaimed with weary air water in the embodiment of the present invention.
As in figure 2 it is shown, the furnace smoke drying enclosed powder process coal-burning boiler unit 501 reclaimed with weary air water is for burning to raw coal 60. The furnace smoke drying enclosed powder process coal-burning boiler unit 501 reclaimed with weary air water includes: 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.
Environment cold wind 61 and cold weary gas are carried out process and form First air by air-supply powder feeding subsystem 403, raw coal 60 is ground by First air and powder process subsystem 401 to be sent in boiler body subsystem 402 after the coal dust obtained mixes by a certain percentage, the secondary wind of air-supply powder feeding subsystem 403 is then directly entered boiler body subsystem 402, and the part high-temperature flue gas in boiler body subsystem 402 is drawn out of the desiccant component as powder process subsystem 401. weary gas in powder process subsystem 401 is separated, it is separated in weary gas with a large amount of steam, the wet weary gas of major part enters weary air water recovery subsystem 404 and cools down, most of steam in weary gas is met condensation and is become aqueous water, aqueous water reclaims to be recovered in subsystem 404 at weary air water and recycles, wet weary gas obtains the cold weary gas done after weary air water reclaims, cold weary gas is blown the powder feeding subsystem 403 pre-thermosetting weary gas of heat, this hot weary gas mixes in air-supply powder feeding subsystem 403 with hot blast and environment cold wind, enter boiler body subsystem 402 after mixing to burn.
Fig. 3 is the construction module schematic diagram of the furnace smoke drying enclosed powder process coal-burning boiler unit reclaimed 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 separation, and powder process subsystem 401 includes: 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 adjustment pipeline 50 and desiccant mixing chamber 20. Here, blower mill 4, mill separator 5 and powder process pipeline 6 constitute gas powder and generate device, and gas powder generates device and 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 is used for burning coal dust, including: coal burner 12, boiler 13 and flue gas take out mouth 19. Boiler 13 is provided with burner hearth 13a, burner hearth 13a be used for making coal dust burn 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 boiler body subsystem 402 is connected, coal dust for being obtained by powder process subsystem 401 is sent in boiler body subsystem 402, provides wind regime to boiler body subsystem 402 simultaneously. Air-supply powder feeding subsystem 403 includes: pressure fan 29, air supply duct 30, the weary air preheater of air 48, first cooling by wind wind pipeline 35, First air hot air duct 36, secondary wind hot air duct 37, secondary air bellow 38, First air mixing chamber 39,40, booster fan 41 of First air pipeline, First air 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 First air mixing chamber 39.
Weary air water reclaims subsystem 404 and is arranged between powder process subsystem 401 and air-supply powder feeding subsystem 403, it is possible to the moisture in the weary gas that efficient recovery powder process subsystem 401 produces. Weary air water reclaims subsystem 404 and includes: weary gas blower fan 22, blast pipe road 24, weary air water withdrawer 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 treatment and purification boiler body subsystem 402, gas cleaning subsystem 405 includes: cleaner unit 14, air-introduced machine 15, boiler exhaust gas pipeline 16, flue gas desulfurization device 17 and chimney 18.
Annexation with furnace smoke drying enclosed powder process coal-burning boiler unit 501 entirety that weary air water reclaims:
In powder process subsystem 401, the outlet of run coal bin 1 is connected with the entrance of feeder 2, the outlet of feeder 2 is connected in raw coal pre-drying device 3, simultaneously, raw coal pre-drying device 3 is also connected with the outlet of desiccant mixing chamber 20, the entrance of blower mill 4 is connected to raw coal pre-drying device 3 and mill separator 5 refluxing opening, the entrance of mill separator 5 is connected with the outlet of blower mill 4, the outlet of mill separator 5 is connected on coal collector 7 by powder process pipeline 6, the coal outlet of coal collector 7 is connected with the import of Pulverized Coal Bin 8, and, the air outlet of coal collector 7 is also connected with 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 by air quantity and is connected with blower mill 4, it is connected with the import of desiccant mixing chamber 20 also 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 mouth 19 and is arranged on the top of boiler 13, and flue gas is taken out the outlet flue of mouth 19 and is connected with the desiccant mixing chamber 20 in powder process subsystem 401.
Reclaim in subsystem 404 at weary air water, weary air water withdrawer 25 is connected with the gas outlet of the weary gas blower fan 22 in powder process subsystem 401 by blast pipe road 24, weary air water withdrawer 25 has cooling medium entrance 80 and cooling medium outlet 81, weary gas bypass duct 26 is in parallel with weary air water withdrawer 25, collecting-tank 27 is connected with weary air water withdrawer 25, for storing the moisture in the weary gas reclaimed by weary air water withdrawer 25, the cold weary gas after weary air water withdrawer 25 reclaims the moisture in weary gas is discharged in the weary air preheater 48 of air through supercool 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, secondary wind hot air duct 37 of leading up to is connected in entrance coal burner 12 with secondary air bellow 38, the First air hot air duct 36 of separately leading up to being in parallel is connected with First air mixing chamber 39, First air mixing chamber 39, First air pipeline 40, booster fan 41, First air bellows 42 are sequentially connected with, air and powder mixer 10 import is connected with machine supplying powder 9 and First air bellows 42 respectively, air and powder mixer 10 connects coal burner 12 by powder feeding pipes 11.
In gas cleaning subsystem 405, cleaner unit 14 import exports with the fume side of the weary air preheater 48 of air and is connected, cleaner unit 14 exports and is connected with air-introduced machine 15 import, air-introduced machine 15 is exported and is connected with flue gas desulfurization device 17 import by boiler exhaust gas pipeline 16, and flue gas desulfurization device 17 exports and is connected with chimney 18.
Fig. 4 is the block diagram of air-supply powder feeding subsystem 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 (i.e. air) is sent in the weary air preheater 48 of air by pressure fan 29 through air supply duct 30, another part of environment cold wind 61 is entered First air mixing chamber 39 by pressure fan 29 through first cooling by wind wind pipeline 35, the hot blast of the air side outlet of the weary air preheater 48 of air introduces secondary air bellow 38 mostly as secondary wind through secondary wind hot air duct 37, and is drawn toward coal burner 12 from secondary air box 38 distribution. another small part hot blast introduces First air mixing chamber 39 through First air hot air duct 36. cold weary gas is introduced and is heated in the weary air preheater of air 48 forming hot weary gas by weary gas blower fan 49, and hot weary gas is sent in First air mixing chamber 39 through overheated blast pipe road 53. hot blast in First air mixing chamber 39, environment cold wind also has hot weary gas to mix by a certain percentage, the temperature of First air is regulated by the flow of the flow of adjusting ambient cold wind and the hot blast flowing into mixed once room 39, regulate the temperature of this First air until First air temperature needed for coal dust safe transport and smooth combustion, the First air of First air mixing chamber 39 outlet enters in supercharging primary air fan 41 through First air hot air duct 40, First air bellows 42 it are sent to after being pressurized, drawn toward air and powder mixer 10 from First air bellows 42 distribution again, and then by the flowing of First air coal dust sent in burner hearth 13a and to burn.
Fig. 5 is the structural representation of the furnace smoke drying enclosed powder process coal-burning boiler unit reclaimed with weary air water in the embodiment of the present invention.
As it is shown in figure 5, the operation principle of the furnace smoke drying enclosed powder process coal-burning boiler unit 501 reclaimed with weary air water:
The flow process of coal: raw coal 60 is delivered into raw coal pre-drying device 3 by run coal bin 1 through feeder 2, mix with the desiccant from desiccant mixing chamber 20 in raw coal pre-drying device 3 and descending complete the predrying of raw coal, blower mill 4 will be milled into coal dust by the dried coal of raw coal pre-drying device 3, coal dust further be dried simultaneously.The weary gas (gas of blower mill 4 outlet is called weary gas) of blower mill 4 outlet enters mill separator 5 with the mixture of coal dust, coal particle thicker in wind powder mixture is isolated and again sends the import of blower mill 4 through refluxing opening back to by mill separator 5, coal collector 7 is entered through powder process pipeline 6 by the mixture of the qualified coal dust of mill separator 5 Yu weary gas, weary gas and coal dust are easily separated by coal collector 7, for collecting coal dust, the coal dust of collection is stored by Pulverized Coal Bin 8, coal dust in Pulverized Coal Bin 8 is sent into air and powder mixer 10 by machine supplying powder 9, mix with a wind facies from First air bellows 42 in air and powder mixer 10, then it is sent to coal burner 12 by powder feeding pipes 11 to burn in burner hearth 13a.
Flue gas flow: coal dust and air burn in burner hearth 13a and generate flue gas, the flue gas in burner hearth 13a is divided into two strands to be discharged in burner hearth 13a outlet. One is taken out mouth 19 from flue gas and extracts the desiccant component as powder process subsystem 401 out, and another strand remains in the interior continuation of flue of boiler 13 and heat follow-up heating surface, and is discharged boiler 13 by the outlet of the weary air preheater 48 of air. The flue gas removing dust device 14 that the outlet of air weary air preheater 48 fume side is discharged introduces boiler induced-draft fan 15 after purifying, and enter flue gas desulfurization device 17 through the smoke discharging pipe 16 of air-introduced machine 15 outlet, through the flue gas 62 of desulfurizing and purifying by chimney 18 discharged to atmospheric environment.
Desiccant flow process: taken out, by flue gas, the high-temperature flue gas that mouth 19 extracts and be mixed to get desiccant required in powder process subsystem 401 in desiccant mixing chamber 20 with the weary gas from recirculation blast pipe road 23, this desiccant enters raw coal pre-drying device 3 via desiccant pipeline 21, and desiccant mixes with coal and descending thus carrying out predrying to coal in raw coal pre-drying device 3.
Spent stream journey: the desiccant of weary gas origin self-desiccation agent mixing chamber 20, powder process subsystem 401 leak out and the transpiring moisture of coal forms. Weary gas and coal dust are easily separated 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 Part I is sent into desiccant mixing chamber 20 as desiccant temperature control medium by recirculation blast pipe road 23, the weary gas of Part III regulates pipeline 50 by air quantity and enters blower mill 4, the air quantity entering blower mill 4 is supplemented, and the weary gas of the Part II weary gas that namely wets sends into weary air water withdrawer 25 through blast pipe road 24. Moisture in the weary gas of Part II is cooled by coolant 80 in weary air water withdrawer 25, thus obtaining a large amount of aqueous water, aqueous water combines in collecting-tank 27. The cold weary gas that weary air water recovery system 25 is discharged is introduced through cold blast pipe road 28 by cold weary gas blower fan 49 and carries out preheating in the weary air preheater of air 48 and obtain hot weary gas, the weary gas of heat forms First air after mixing with a part for environment cold wind, a part of hot blast, the temperature of First air can be regulated by the flow of adjusting ambient cold wind, First air and coal dust enter burner hearth 13a burning, the weary gas of heat in First air melt down participate in burning ensure that weary gas is likely to containing the abundant after-flame of volatile matter thus ensureing the efficiency of combustion of raw coal 60.
The effect of embodiment and effect
In the furnace smoke drying enclosed powder process coal-burning boiler unit reclaimed with weary air water involved by the present embodiment, because coal collector makes coal dust and weary gas separated at coal collector, and weary gas is 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 height and water dew point are high, so being condensed water by weary gas lowered temperature reclamation to substantially increase the exploitativeness that in flue gas, moisture reclaims.Weary gas in high-moisture coal pulverizing system is enriched with large quantity of moisture, and aqueous dew point temperature is high, condenses water by weary air cooling recyclable a large amount of liquid, has prominent Water Sproading benefit.
And, using the mixture of the weary gas of the flue gas of high temperature and recirculation as powder process subsystem desiccant, the oxygen content making desiccant is substantially less compared with conventional dry drying prescription, thus significantly reducing coal risk of combustion explosion in flour mill flow, and desiccant temperature can be conveniently adjusted by the flow of the adjustment weary gas of recirculation, thus ensureing that pulverizer outlet temperature is within suitable scope. Mix as desiccant using the weary gas of high-temperature flue gas and recirculation, can further improve weary gas water capacity and water dew point, so that weary air water reclaims is more easy to realization.
And, the weary gas formed 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 of air preheats, the weary gas of heat is mixed to get First air with a part of hot blast and another part environment cold wind at First air mixing chamber, this First air oxygen content is low, coal dust can be avoided to burn in powder feeding pipes, thus conveying high volatile coal dust is to coal burner safely. Meanwhile, this hypoxic First air can adopt higher powder feeding temperature, thus significantly improving the combustion stability of breeze airflow. And, after adopting above-mentioned powder process subsystem, the burner hearth flame temperature of boiler can increase, and further enhances catching fire and after-flame performance of breeze airflow.
Further, because have employed enclosed powder process, namely weary gas melt down participation burning so that weary gas is likely to containing volatile matter also abundant after-flame in burner hearth, thus ensure that the efficiency of combustion of raw coal. And, because the volatile matter being likely to precipitate out in pulverizing process enters in burner hearth with First air and after-flame, so it is unnecessary to avoid Volatile strictly to control pulverizer outlet temperature in lower value in enclosed powder process unit, pulverizer outlet temperature can appropriateness improve, this significantly reduces requirement pulverized coal preparation system being run and controlling on the one hand, reduce so that more moisture in coal are evaporated in weary gas because coal dust moisture raises with pulverizer outlet temperature on the other hand, thus increasing the water yield reclaimed from weary gas further.
And, because the moisture major part evaporated from powder process subsystem in producing coal does not enter back into burner hearth after reclaiming because of weary air water, and the cold smoke extracted by boiler induced-draft fan exhaust pass is no longer at boiler internal recycle, the exhaust gas volumn flowing through back-end ductwork and the weary air preheater of air in boiler is significantly reduced, cigarette/edema due to wind pathogen equivalent proportion that result is the weary air preheater of air reduces, and namely the weary air preheater outlet exhaust gas temperature of air reduces. In addition boiler exhaust gas amount also reduces because a part of steam is recovered in weary air water retracting device, thus boiler exhaust gas heat loss reduces, and boiler thermal output improves accordingly.
And, First air temperature and primary air ratio can be conveniently adjusted by arranging First air mixing chamber, thus ensureing powder feeding safety and breeze airflow combustion stability, hot weary gas, component environment cold wind and part hot blast are carried out being mixed to form First air by First air mixing chamber so that the temperature of First air can be regulated by the flow of the flow of adjustment component environment cold wind and part hot blast. Desiccant temperature can be conveniently adjusted, thus ensureing the high-temperature flue gas predrying effect to raw coal in raw coal pre-drying device by regulating the weary tolerance of recirculation.Regulate pipeline by arranging coal pulverizer air quantity, coal pulverizer can be made to work under optimal ventilation amount, thus ensureing pulverizer capacity and reducing powder process power consumption.
To sum up, embodiment can provide a kind of green high-efficient coal-burning boiler system, solve the problem that high-moisture coal-fired boiler combustion is unstable, decrease the coal-grinding power consumption of coal pulverizer, overcome the tradition inefficient shortcoming of high-moisture coal-fired boiler hot, while boiler thermal output and unit generation efficiency are greatly improved, powder process subsystem runs the safety in operation that improve high volatile coal powder process subsystem under inerting atmosphere, significantly improve the weary gas water capacity of powder process subsystem and water dew point, weary air water is reclaimed and is prone to Project Realization, also make by cooling down the increase of weary gas gained condensing capacity.
Certainly the involved in the present invention furnace smoke drying enclosed powder process coal-burning boiler unit reclaimed with weary air water is not merely defined in the structure in above-described embodiment one. Above content is only the basic explanation under present inventive concept, and according to any equivalent transformation that technical scheme is made, all should belong to protection scope of the present invention.
Claims (4)
1. the furnace smoke drying enclosed powder process coal-burning boiler unit reclaimed with weary air water, for raw coal is burnt, it is characterised in that including:
Powder process subsystem, boiler body subsystem, air-supply powder feeding subsystem and weary air water reclaim subsystem,
Wherein, described powder process subsystem comprises: the raw coal pre-drying device, the gas powder that are sequentially connected with generate device, coal collector, Pulverized Coal Bin, machine supplying powder and the desiccant mixing chamber being connected with described raw coal pre-drying device,
Described boiler body subsystem comprises: is provided with the boiler of burner hearth, the flue being connected with the afterbody of described burner hearth, is positioned at the coal burner of described burner hearth entry position and is positioned at the flue gas near the exhanst gas outlet of described burner hearth and take 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 cold weary gas blower fan providing the pressure fan of environment cold wind to be connected with described air weary air preheater air inlet and First air mixing chamber,
Described weary air water reclaims subsystem and comprises: export, with the weary gas of described coal collector, the weary air water retracting device being connected,
Described raw coal pre-drying device utilizes the desiccant from described desiccant mixing chamber to carry out predrying to described raw coal,
Described gas powder generates after the described raw coal after predrying is ground and is further dried by device and obtains primary mixture,
Described primary mixture is easily separated and obtains coal dust and weary gas by described coal collector,
Described coal dust is stored by described Pulverized Coal Bin,
Described machine supplying powder for measuring and regulable control flows to the coal-supplying amount of described air and powder mixer,
First air and described coal dust from described air-supply powder feeding subsystem is mixed to get wind powder mixture by described air and powder mixer,
Described coal dust in described wind powder mixture is burnt by described coal burner,
Described coal dust generates flue gas in the internal-combustion of described burner hearth,
Described desiccant mixing chamber is taken out the weary gas outlet of mouth and described coal collector respectively and is connected with described flue gas, delivers to described raw coal pre-drying device as described desiccant after being mixed with a part for described flue gas by the weary gas of Part I extracted in described weary gas,
The weary gas of Part II in described weary gas is introduced and is reclaimed by the moisture in weary for this Part II gas by described weary air water retracting device, and the weary gas of described Part II obtains cold weary gas after described weary air water retracting device condenses,
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 thermally formed the weary air preheater of described air hot blast and to the described cold weary gas pre-thermosetting weary gas of heat, a part for this hot blast is sent directly into described coal burner as secondary wind,
Described First air mixing chamber for obtaining described First air after another part of described hot blast, another part of described environment cold wind and the weary gas of described heat are mixed,
Described First air and described coal dust are carried out being mixed to get described wind powder mixture by described air and powder mixer,
Described desiccant mixing chamber sends into described raw coal pre-drying device after being mixed with the described flue gas taking out mouth extraction from described flue gas by weary for described Part I gas.
2. the furnace smoke drying enclosed powder process coal-burning boiler unit reclaimed with weary air water according to claim 1, it is characterised in that also include:
Gas cleaning subsystem, comprises: cleaner unit, air-introduced machine, boiler exhaust gas pipeline, flue gas desulfurization device and the chimney being connected with the weary air preheater of described air,
The outlet of described air-introduced machine is connected by the import of described boiler exhaust gas pipeline with described flue gas desulfurization device, and the outlet of described flue gas desulfurization device is connected with described chimney.
3. the furnace smoke drying enclosed powder process coal-burning boiler unit reclaimed with weary air water according to claim 1, it is characterised in that:
Wherein, described weary air water retracting device includes: exports with the weary gas of described coal collector and is connected the blast pipe road that described weary gas is carried, the weary air water withdrawer being connected with described blast pipe road and stores the collecting-tank of moisture in described weary gas.
4. the furnace smoke drying enclosed powder process coal-burning boiler unit reclaimed with weary air water according to claim 1, it is characterised in that:
Wherein, described powder process subsystem also includes one end and is connected with the weary gas outlet of described coal collector, the other end generates the air quantity adjustment pipeline that the import of device is connected with described gas powder, is used for that the weary pneumatic transmission of Part III that the outlet of described weary gas is sent enters described gas powder generation device and supplements the air quantity regulating entrance described gas powder generation device.
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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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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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| JP5535112B2 (en) * | 2011-03-25 | 2014-07-02 | 月島機械株式会社 | Coal thermal power generation facility and coal thermal power generation method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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