CN104197357B - With the stove cigarette hot air drying enclosed powder process coal-burning boiler unit that weary air water reclaims - Google Patents
With the stove cigarette hot air drying enclosed powder process coal-burning boiler unit that weary air water reclaims Download PDFInfo
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- CN104197357B CN104197357B CN201410472022.8A CN201410472022A CN104197357B CN 104197357 B CN104197357 B CN 104197357B CN 201410472022 A CN201410472022 A CN 201410472022A CN 104197357 B CN104197357 B CN 104197357B
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Abstract
The invention provides a kind of stove cigarette hot air drying enclosed powder process coal-burning boiler unit reclaimed with weary air water, including: the coal-supplying amount sending into boiler is measured and regulable control by weighing coal feeder, air-locked type machine supplying powder is for pulverized coal conveying and prevents coal dust generation air channelling and maintains coal dust and circulate smoothly, environment cold wind is heated by the weary air preheater of air, Part I hot blast is sent directly into coal burner as secondary wind, desiccant mixing chamber takes out mouth with flue gas respectively, the weary air preheater of air is connected, raw coal pre-drying device is sent into as desiccant after the flue gas taking out mouth extraction from flue gas and Part II hot blast being mixed, the weary gas of Part I is cooled down thus obtaining a large amount of condensation water and discharging cold weary gas by weary air water retracting device, a cold weary gas part is thermally formed hot weary gas by the weary air preheater of air, heat weary gas mix with the another part in cold weary gas as First air entrance air and powder mixer and coal dust carry out being mixed to get wind powder mixture.
Description
Technical field
The present invention relates to the stove cigarette hot air 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. Owing to the moisture of coal dust is high, volatile matter is high, so the isolated weary band of gas has a large amount of steam and coal dust from coal dust, weary gas is directly discharged in air by usual existing boiler, causes that the coal dust in weary gas is wasted, and reduces the utilization rate of coal dust.
In conventional bin storage type pulverizing system boiler, in order to have certain coal supply buffer capacity, make pulverizing process and combustion process relatively independent, often it is provided with Pulverized Coal Bin, but, for high-volatile coals such as brown coal and quasi-east coals, pulverized coal preparation system arranges Pulverized Coal Bin and stores inflammable and explosive high volatile coal dust, the Explosion-proof Design of this Pulverized Coal Bin is required higher, adds the difficulty ensureing that pulverized coal preparation system runs safety.
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 stove cigarette hot air drying enclosed powder process coal-burning boiler unit reclaimed with weary air water of high efficiency generating.
The present invention provides a kind of stove cigarette hot air 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 weighing coal feeder being sequentially connected with, raw coal pre-drying device, gas powder generates device, coal collector, air-locked type 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, cold weary gas blower fan and hot blast pipe road, weary air water reclaims subsystem and comprises: the weary air water retracting device being connected with the gas outlet of coal collector, the coal-supplying amount sending into boiler is carried out metering regulable control by weighing coal feeder, raw coal pre-drying device utilizes the desiccant from desiccant mixing chamber to carry out predrying to raw coal, gas powder generates after dried raw coal 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, air-locked type machine supplying powder is for pulverized coal conveying and prevents coal dust generation air channelling and maintains coal dust and circulate smoothly, 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, weary for Part I in weary gas gas is introduced and is reclaimed by the moisture in weary for this Part I gas by weary air water retracting device, the weary gas of Part I obtains cold weary gas after weary air water retracting device condenses, environment cold wind is heated obtaining hot blast by the weary air preheater of air, Part I hot blast in hot blast is sent directly into coal burner as secondary wind, Part II hot blast in hot blast is sent directly into desiccant mixing chamber, cold weary gas blower fan obtains hot weary gas by carrying out preheating in the part introducing weary air preheater of air of cold weary gas, another part of the weary gas of heat and cold weary gas sends into air and powder mixer as First air through hot blast pipe road, desiccant mixing chamber takes out mouth with flue gas respectively, the weary air preheater of air is connected, the flue gas that mouth extracts will be taken out from flue gas, and Part II hot blast mix after as desiccant send into raw coal pre-drying device.
In the stove cigarette hot air 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 stove cigarette hot air drying enclosed powder process coal-burning boiler unit reclaimed with weary air water provided by the invention, can also having a feature in that wherein, weary air water retracting device includes: be connected with the gas outlet of coal collector for 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 stove cigarette hot air 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 recirculation blast pipe road that the other end is connected with the import of desiccant mixing chamber, recirculation blast pipe road is for entering desiccant mixing chamber by the weary pneumatic transmission of Part II that weary gas exports in the weary gas sent, and the weary gas of Part II and desiccant are mixed for regulating the temperature of desiccant.
In the stove cigarette hot air 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, and the weary pneumatic transmission of Part III being used in the weary gas outlet of weary gas sent enters gas powder generation device and supplements the air quantity regulating entrance gas powder generation device.
The effect of invention and effect
According to the involved in the present invention stove cigarette hot air drying enclosed powder process coal-burning boiler unit reclaimed with weary air water, 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.
Great lot of water resources is reclaimed so that " zero water consumption " coal-burning power plant is possibly realized owing to height cooling containing wet weary gas condenses. Meanwhile, eliminate the Pulverized Coal Bin of storage high volatile coal dust, be conducive to simplifying flour mill flow and reduce equipment investment and improve pulverized coal preparation system safety in operation.
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, the cold weary gas of part is delivered to the heating of air weary air preheater by cold weary gas blower fan and is obtained hot weary gas, the weary gas of heat and the cold weary gas of another part are mixed to get First air by hot blast pipe road, this First air oxygen content is low, coal dust can be avoided at powder feeding combustion inner pipe, 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 stove, 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 stove 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 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 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 reclaims in weary air water retracting device, thus boiler exhaust gas heat loss reduces, and boiler thermal output improves accordingly.
Additionally, using the mixture of the flue gas of high temperature and the Part II hot blast desiccant as powder process subsystem, the desiccant of preference temperature can not only be provided, also high-temperature flue gas extraction amount is made to reduce, in the weary air preheater of air, cold medium caloric receptivity increases simultaneously, result is so that the cigarette in the weary air preheater of air/edema due to wind pathogen equivalent proportion reduces further, and therefore boiler thermal output can further improve.
Therefore, the present invention can provide a kind of not only realize the moisture in weary gas is reclaimed and recycled can also realize boiler thermal output and the in hgher efficiency stove cigarette hot air 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 stove cigarette hot air 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 stove cigarette hot air 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 stove cigarette hot air 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 stove cigarette hot air 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: stove cigarette hot air drying enclosed powder process coal-burning boiler unit 501, Steam Turbine 502 and the generating set 503 reclaimed with weary air water.
Water is heated by the heat that raw coal produces after burning in the stove cigarette hot air drying enclosed powder process coal-burning boiler unit 501 reclaimed with weary air water, water is thermally formed the steam entrance Steam Turbine 502 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 stove cigarette hot air 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 stove cigarette hot air drying enclosed powder process coal-burning boiler unit 501 reclaimed with weary air water is for burning to raw coal.The stove cigarette hot air 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.
The First air of air-supply powder feeding subsystem 403 is sent in boiler body subsystem 402 after mixing by a certain percentage with the coal dust of powder process subsystem 401, 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, with a large amount of steam in the weary gas being separated, major part is cooled with the wet weary gas entrance weary air water recovery subsystem 404 of steam, 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, and cold weary gas is entered boiler body subsystem 401 after being processed by powder feeding subsystem 403 of blowing and burns.
Fig. 3 is the structural representation of the stove cigarette hot air 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, weighing coal feeder 2, raw coal pre-drying device 3, blower mill 4, mill separator 5, powder process pipeline 6, coal collector 7, recirculation blast pipe road 23, coal pulverizer air quantity regulate pipeline 51, desiccant mixing chamber 20, air-locked type machine supplying powder 52. 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. Air-locked type machine supplying powder 52 is for pulverized coal conveying and prevents coal dust generation air channelling and maintains coal dust and circulate smoothly.
Boiler body subsystem 402 is used for burning coal dust, including: coal burner 12, boiler 13, flue (not shown in FIG.) and flue gas take out mouth 19. Boiler 13 comprises burner hearth 13a, burner hearth 13a and is used for making coal dust burn as much as possible in burner hearth 13a.
Air-supply powder feeding subsystem 403 is connected with powder process subsystem 401 and boiler body subsystem 402, and the 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, hot air drying pipeline 47, secondary wind hot air duct 37, secondary air bellow 38, First air bellows 42, air and powder mixer 10, powder feeding pipes 11, cold weary gas blower fan 49, cold weary gas bypass 46, hot blast pipe road 53.
Weary air water reclaims subsystem 404 and is arranged between powder process subsystem 401 and air-supply powder feeding subsystem 403, 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 stove cigarette hot air drying enclosed powder process coal-burning boiler unit 501 entirety that weary air water reclaims:
In powder process subsystem 401, the outlet of run coal bin 1 is connected with the entrance of weighing coal feeder 2, the outlet of weighing coal 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 air-locked type machine supplying powder 52, 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 air-locked type machine supplying powder 52 is connected with air and powder mixer 10, the air outlet of weary gas blower fan 22 regulates pipeline 51 by coal pulverizer 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 sent in cold weary gas blower fan 49 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 weary air preheater 48 of air is positioned at flue afterbody, the hot blast of the weary air preheater 48 of air divides two parts, a part is entered subsequently in coal burner 12 in secondary air bellow 38 by secondary wind hot air duct 37 for Part I hot blast, and also having a road is that Part II hot blast enters desiccant mixing chamber 20 by hot air drying pipeline 47. One end of hot air drying pipeline 47 connects the outlet of the weary air preheater 48 of air, and the other end then connects desiccant mixing chamber 20. Hot blast pipe road 53 is connected with First air bellows 42, and air and powder mixer 10 import is connected with air-locked type machine supplying powder 52 and First air bellows 42 respectively, air and powder mixer 10 is connected 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, environment cold wind 61 (i.e. air) is sent in the weary air preheater 48 of air through air supply duct 30 by pressure fan 29. The major part of the hot blast of air weary air preheater 48 air side outlet is, Part I hot blast introduces secondary air bellow 38 as secondary wind through secondary wind hot air duct 37, secondary wind is drawn in coal burner 12 from secondary air box 38 distribution, and additionally small part hot blast is, Part II hot blast enters desiccant mixing chamber 20 through hot air drying pipeline 47.The weary gas of Part II hot blast, Part II and from flue gas take out mouth 19 extract part of smoke mix after as desiccant send into raw coal pre-drying device 3.
Fig. 5 is the structural representation of the stove cigarette hot air 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 stove cigarette hot air drying enclosed powder process coal-burning boiler unit 501 reclaimed with weary air water:
The flow process of coal: raw coal 60 is weighed formula feeder 2 by run coal bin 1 and delivers into raw coal pre-drying device 3, weighing coal feeder 2 is for measuring and regulable control the coal-supplying amount sending into boiler 13, raw coal 60 mixes with the desiccant from desiccant mixing chamber 20 in raw coal pre-drying device 3 and descending completes the predrying of raw coal 60, 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, air-locked type feeder 52 is connected between coal collector 7 and air and powder mixer 10, for pulverized coal conveying and prevent coal dust and air generation air channelling, coal dust is made to pass into air and powder mixer 10 smoothly, coal dust mixes with a wind facies from First air bellows 42 in air and powder mixer 10, then it is sent to coal burner 12 via powder feeding pipes 11 to burn in burner hearth 13a.
Flue gas flow: coal dust and air burn in the burner hearth 13a of boiler 13 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 air-introduced machine 15 after purifying, and enters 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 high-temperature flue gas that mouth 19 extracts and the mixture that the weary gas from recirculation blast pipe road 23 also has Part II steam to be mixed to get in desiccant mixing chamber 20 by flue gas, mixture is desiccant required in powder process subsystem 401, 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, and isolated weary gas is extracted out by weary gas blower fan 22 and is divided into three parts, and wherein, the weary gas of Part II 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 51 by air quantity and enters blower mill 4, and the air quantity entering blower mill 4 is supplemented, and the weary gas of Part I sends into weary air water withdrawer 25 through blast pipe road 24.The weary gas of high hygroscopic water 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 draws toward cold weary gas blower fan 49 through cold blast pipe road 28, cold for part weary pneumatic transmission is entered to be heated in the weary air preheater of air 48 obtaining hot weary gas by cold weary gas blower fan 49, cold for another part weary gas is sent in hot blast pipe road 53 by cold weary gas bypass 46 by cold weary gas blower fan 49, the cold weary gas of this part is transfused to First air bellows 42 as First air after mixing in hot blast pipe road 53 with the weary gas of heat, then First air enters coal burner 12 by powder feeding pipes 11 with coal dust after air and powder mixer 10 mixes, by regulating in cold weary gas bypass 46 flow of cold weary gas thus regulating the temperature of First air, First air enters burning in burner hearth 13a, make the weary gas 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 stove cigarette hot air 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. Meanwhile, eliminate the Pulverized Coal Bin of storage high volatile coal dust, be conducive to simplifying flour mill flow and reduce equipment investment and improve pulverized coal preparation system safety in operation.
Additionally, 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 blower fan is partly in the weary air preheater of air to be heated obtaining hot weary gas by cold weary gas, another part is bypassed by cold weary gas after mixing in hot blast pipe road with the weary gas of heat as First air, this First air oxygen content is low, coal dust can be avoided at powder feeding combustion inner pipe, 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 stove, 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 stove 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 because weary air water reclaims, 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 reclaims in weary air water retracting device, thus boiler exhaust gas heat loss reduces, and boiler thermal output improves accordingly. further, due to the present embodiment powder process subsystem drying capacity thermal source some from the heat (with Part II hot blast for heat-carrying agent) of boiler back end ductwork flue gas, thus high-temperature flue gas extraction amount tends to reducing, the air capacity simultaneously flowed through in the weary air preheater of air significantly increases, obviously in the weary air preheater of air the increase amplitude of air mass flow far above the increase amplitude of flue gas flow, result is that the cigarette in the weary air preheater of air/edema due to wind pathogen equivalent proportion can reduce further, namely under identical air weary air preheater inlet flue gas temperature and outlet hot blast temperature, the outlet exhaust gas temperature of the weary air preheater of air can reduce further. thus the stove cigarette hot air drying enclosed powder process coal-burning boiler unit reclaimed with weary air water of the present embodiment can make boiler thermal output improve further.
In the present embodiment, First air temperature can being conveniently adjusted by arranging cold weary gas bypass duct by the weary air preheater of air, thus ensureing powder feeding safety and breeze airflow combustion stability, regulating cold weary gas bypass flow scalable First air temperature. Because recirculation blast pipe road amount, the weary gas of Part II can be conveniently adjusted desiccant temperature thus ensureing the raw coal pre-drying device internal desiccant predrying effect to raw coal. Regulate pipeline by 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 one can provide a kind of green high-efficient coal-burning boiler system, solve the unstable problem of high-moisture coal-fired boiler combustion, decrease the coal-grinding power consumption of coal pulverizer, overcome the tradition inefficient shortcoming of high-moisture coal-fired boiler hot, recovery great lot of water resources can be condensed by height cooling containing wet weary gas while boiler thermal output and unit generation efficiency are greatly improved, make realization " zero water consumption " efficient fuel coal power plant be possibly realized, there is prominent economic benefit and environment protection significance.
Certainly the involved in the present invention stove cigarette hot air drying enclosed powder process coal-burning boiler unit reclaimed with weary air water and electricity generation system are not merely defined in structure in the above-described embodiments. 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 (5)
1. the stove cigarette hot air 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 weighing coal feeder that is sequentially connected with, raw coal pre-drying device, gas powder generate device, coal collector, air-locked type 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 providing the pressure fan of environment cold wind, cold weary gas blower fan and hot blast pipe road,
Described weary air water reclaims subsystem and comprises: export, with the weary gas of described coal collector, the weary air water retracting device being connected,
The coal-supplying amount sending into described boiler is carried out metering regulable control by described weighing coal feeder,
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 dried described raw coal 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 air-locked type machine supplying powder is for pulverized coal conveying and prevents described coal dust generation air channelling and maintains described coal dust and circulate smoothly,
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,
The weary gas of Part I in described weary gas is introduced and is reclaimed by the moisture in weary for this Part I gas by described weary air water retracting device, and the weary gas of described Part I obtains cold weary gas after described weary air water retracting device condenses,
Described environment cold wind is heated obtaining hot blast by the weary air preheater of described air, and the Part I hot blast in described hot blast is sent directly into described coal burner as secondary wind, and the Part II hot blast in described hot blast is sent directly into described desiccant mixing chamber,
Described cold weary gas blower fan obtains hot weary gas by carrying out preheating in the part introducing weary air preheater of described air of described cold weary gas, and another part of the weary gas of described heat and described cold weary gas sends into air and powder mixer as First air through described hot blast pipe road,
Described desiccant mixing chamber takes out mouth respectively with described flue gas, the weary air preheater of described air is connected, and sends into described raw coal pre-drying device as described desiccant after the described flue gas taking out mouth extraction from described flue gas and described Part II hot blast being mixed.
2. the stove cigarette hot air 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 stove cigarette hot air 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: be connected for the blast pipe road that described weary gas is carried, the weary air water withdrawer being connected with described blast pipe road and the collecting-tank storing described weary air water with the outlet of the weary gas of described coal collector.
4. the stove cigarette hot air 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 recirculation blast pipe road that the other end is connected with the import of described desiccant mixing chamber,
The weary pneumatic transmission of Part II that described recirculation blast pipe road is used in the described weary gas outlet of described weary gas sent enters described desiccant mixing chamber,
The weary gas of described Part II and described desiccant are mixed for regulating the temperature of described desiccant.
5. the stove cigarette hot air 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, and the weary pneumatic transmission of Part III being used in the described weary gas outlet of described weary gas sent enters described gas powder generation device and supplements the air quantity regulating entrance described gas powder generation device.
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| CN201410472022.8A CN104197357B (en) | 2014-09-16 | 2014-09-16 | With the stove cigarette hot air drying enclosed powder process coal-burning boiler unit that weary air water reclaims |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102889609A (en) * | 2011-07-20 | 2013-01-23 | 上海机易电站设备有限公司 | Pulverizing system of smoke drying lignite coal steel ball mill |
| CN203116491U (en) * | 2013-03-18 | 2013-08-07 | 施大钟 | Lignite water take-out lignite efficient burning system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB201020001D0 (en) * | 2010-11-25 | 2011-01-12 | Doosan Power Systems Ltd | Low rank coal processing apparatus and method |
| GB201218747D0 (en) * | 2012-10-18 | 2012-12-05 | Doosan Power Systems Ltd | Milling and drying apparatus and method |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102889609A (en) * | 2011-07-20 | 2013-01-23 | 上海机易电站设备有限公司 | Pulverizing system of smoke drying lignite coal steel ball mill |
| CN203116491U (en) * | 2013-03-18 | 2013-08-07 | 施大钟 | Lignite water take-out lignite efficient burning system |
Non-Patent Citations (1)
| Title |
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| 基于炉烟干燥及水回收风扇磨仓储式制粉系统的高效褐煤发电技术;马有福等;《中国电机工程学报》;20130215;第33卷(第5期);13-20 * |
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Effective date of registration: 20160413 Address after: 200093 Shanghai military road, Yangpu District, No. 516 Applicant after: University of Shanghai for Science and Technology Applicant after: Co., Ltd of Northeastern Electric Power Design Institute, China Power Engineering Consulting Group Corporation Applicant after: Shanghai Electric Power Generation Equipment Co., Ltd. Address before: 200093 Shanghai military road, Yangpu District, No. 516 Applicant before: University of Shanghai for Science and Technology |
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