CN203687076U - Intermediate storage type hot primary air heat exchanging type returned pulverized coal milling and coal pulverizing system of coal fired boiler - Google Patents
Intermediate storage type hot primary air heat exchanging type returned pulverized coal milling and coal pulverizing system of coal fired boiler Download PDFInfo
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- CN203687076U CN203687076U CN201420062489.0U CN201420062489U CN203687076U CN 203687076 U CN203687076 U CN 203687076U CN 201420062489 U CN201420062489 U CN 201420062489U CN 203687076 U CN203687076 U CN 203687076U
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Abstract
The utility model discloses an intermediate storage type hot primary air heat exchanging type returned pulverized coal milling and coal pulverizing system of a coal fired boiler. A heat exchanging device is additionally arranged on a hot primary air female pipe of an existing intermediate storage type steel ball coal mill hot air pulverized coal conveying and pulverizing system, the temperature of primary air is reduced so that high volatile matter soft coal can be conveyed, and the explosion of the coal pulverizing system due to soft coal milling is avoided. A returned pulverized coal milling device is additionally arranged on a returned pulverized coal pipe, and after the returned pulverized coal is milled into the qualified pulverized coal, the qualified pulverized coal is mixed with wind pulverized coal in the inlet of a coarse pulverized coal separating device. The system can burn high volatile matter soft coal under the situation that the primary air pipe heat exchanging device operates, the returned pulverized coal milling device is started, output is greatly improved, and pulverizing unit consumption is reduced; the pulverizing system can be changed into hot air pulverized coal conveying to convey low volatile matter meagre coal or blind coal under the condition that the heat exchanging device is stopped, the returned pulverizing coal milling device is started, the fineness of pulverized coal is greatly reduced under the condition that the output of the pulverizing system is maintained, and the evenness index of the pulverized coal is improved. Thus, the system is a universal pulverized coal boiler coal pulverizing system for soft coal, meagre coal, blind coal and all kinds of coal.
Description
Technical field
The utility model relates to coal-burning boiler system, is specifically in a kind of coal-burning boiler, to store up formula heat primary air heat exchange type to return the powder pulverized coal preparation system of milling.
Background technology
In recent years, because power coal market changes greatly, the low-volatile coal matter rise in price such as meager coal, anthracite, cause the thermal power generation corporations' cost that uses low-volatile ature of coal constantly to rise, and on the contrary, the fat coal quality and price lattice such as bituminous coal progressively reduce.Change in order to adapt to power coal market, reduce production costs, the poor cigarette project that changes of thermal power generation corporations is frequently implemented.
At present, meager coal changes and burns bituminous coal modification scheme and mainly contain following several:
1, unit pulverized-coal system modification scheme (budget 7000-8000 ten thousand)
This scheme is in the low speed coal mill of meager coal, anthracite-fired boiler, to store up formula pulverized coal carried by hot air pulverized coal preparation system and directly transform the medium-speed pulverizer unit pulverized-coal system that is applicable to grinding high-volatile bituminous coal as using.This modification scheme does not have large technology barriers, just the transformation cycle long, expense is high, and can not use the low-volatile such as meager coal, anthracite ature of coal after transforming.
2, transporting pulverized coal with exhaust gas pulverizing system transformation scheme (budget 3000-4000 ten thousand)
Be transporting pulverized coal with exhaust gas pulverized coal preparation system by pulverized coal carried by hot air pulverizing system transformation, though coal pulverizer does not need replacing, still, mill exhauster must be changed, therefore, this scheme is applicable to using high-volatile bituminous coal, and improvement expenses still can, but, this scheme is only suitable for using bituminous coal, is not suitable for using the low-volatile such as meager coal, anthracite ature of coal, and stops transport or because powder storehouse powder position is compared with high must stop pulverized coal preparation system time at coal pulverizer, exhaust gas temperature rises, and affects boiler efficiency.
3, the dry weary gas and hot air composite powder feeding system reform scheme (3,500 ten thousand yuan of budgets) of stove cigarette
Extract stove cigarette, mix by different proportion with hot blast, weary gas, heating raw coal, adopts the weary gas of mill exhauster exit portion and heat primary air mixing pulverized coal conveying.This scheme had both been applicable to use bituminous coal, was also applicable to use meager coal, and there are some superiority improvement expenses and duration compared with transporting pulverized coal with exhaust gas scheme, and still, this scheme system complex, easily blasts.
Above meager coal changes burning bituminous coal scheme and all exists certain limitation, need to propose a kind of new theory, so that meeting the market requirement.
Summary of the invention
Technical problem to be solved in the utility model is to solve problem presented above, adapt to the variation in coal market, expand the adaptability of boiler combustion to coal, provide and in a kind of coal-burning boiler, store up formula heat primary air heat exchange type and return the powder pulverized coal preparation system of milling, both burning high-volatile bituminous coal, also burning Low Volatile Lean Coal or anthracite, proposes the pervasive boiler combustion system of a kind of coal.
In described coal-burning boiler, store up formula heat primary air heat exchange type and return the powder pulverized coal preparation system of milling, comprise the feeder setting gradually according to flour mill flow, down drying pipe, coal pulverizer, coal dust sorting unit, segmentation sorting unit, Pulverized Coal Bin, machine supplying powder, air and powder mixer and burner hearth, wherein burner hearth is provided with coal burner, overfire air port, tertiary air nozzle, SOFA wind snout, described air and powder mixer is through the coal burner of an airduct connection burner hearth, the afterbody of described burner hearth is provided with air preheater, after the air heat that air preheater is sent into primary air fan, send into the female pipe of heat primary air, it is characterized in that: add heat exchanger through the female pipe of described heat primary air, be used for regulating control heat primary air temperature, the female pipe of heat primary air after heat exchanger is connected with the large bellows of wind one time before described air and powder mixer, the outlet of the described large bellows of wind connects the many heat primary air pipes that are communicated with described air and powder mixer.
Further, the powder retrieving pipe of described meal sorting unit is connected to back powder air deflector entrance, described time powder air deflector is provided with two outlets, an outlet is connected with an entrance of described down drying pipe by powder retrieving pipe, another outlet connects one and returns powder milling device, and described time powder milling device outlet is connected with coal dust sorting unit entrance; Make to be sorted from described coal dust sorting unit the powder that returns getting off and enter into described returning after powder milling device circulates and mill through described time powder air deflector, send into described coal dust sorting unit and carry out sorting, in the time that the work of described time powder milling device is broken down or needs maintaining, described time powder air deflector will return powder and send into described down drying pipe through powder retrieving pipe; Be transported into fine powder sorting unit from described coal dust sorting unit qualified coal dust out through pipeline and separate, qualified coal dust enters described Pulverized Coal Bin and stores.
A kind of prioritization scheme, the outlet of described fine powder sorting unit connects blast pipe road, entrance adjustment doors by mill exhauster is connected with mill exhauster, described mill exhauster is provided with two outlets, an outlet connects recirculation airduct, another outlet connects tertiary-air pipe, and the end of described recirculation airduct is connected with described down drying pipe, and the end of described tertiary-air pipe is connected with the tertiary air nozzle of burner hearth; Make from described fine powder sorting unit weary gas out, enter mill exhauster through blast pipe road, and after mill exhauster boosts, one tunnel enters described down drying pipe as reduced air through recirculation air door, another road enters burner hearth as tertiary air through the tertiary air nozzle on described burner hearth, and tertiary air contains a certain amount of microfine coal, can be used as reducing agent, the reduction of nitrogen oxide that part primary zone is generated, reduces the discharge of nitrogen oxide.
Further, the heat transferring medium of described heat exchanger is external condensed water, entrance pipe at external condensed water is provided with control valve, for controlling to adjust the outlet temperature of heat primary air or the outlet temperature of condensed water, close control valve, this pulverized coal preparation system switches to pulverized coal carried by hot air, can carry Low Volatile Lean Coal or anthracite, makes this system applicable to the pervasive coal using from high-volatile bituminous coal to low-grade anthracite coal.
A kind of embodiment, described air preheater is also connected with pressure fan, air after air preheater boosts pressure fan is heated as hot Secondary Air through air preheater, described hot Secondary Air is along hot secondary air duct, a part is delivered to the described overfire air port of burner hearth, and the primary zone that enters burner hearth participates in the anoxycausis of low NOx; Another part is sent into the SOFA wind snout of burner hearth, as SOFA after-flame wind, unburnt carbon is burnt away, to reduce unburned combustible in fly ash.
A kind of embodiment, outlet after described primary air fan boosts air is heated without air preheater, being provided with pipeline is connected through the female pipe of first cooling by wind air door and heat primary air, need to overhaul for going wrong when described heat exchanger operation time, open first cooling by wind air door, a cold wind is mixed at a female pipe of wind with heat primary air, to reduce heat primary air temperature, carry high-volatile bituminous coal.
The heat transferring medium of described heat exchanger is external condensed water, is provided with control valve at the entrance pipe of external condensed water, for controlling to adjust the outlet temperature of heat primary air or the outlet temperature of condensed water.
The present invention can increase substantially pulverized coal preparation system and exert oneself, and adapts to grind high-volatile bituminous coal; Coal dust is carried the heat primary air adopting after air preheater heating, then reduces temperature to the pulverized coal carried by hot air of 75-160 DEG C through heat exchanger, because Volatile Matter of Bituminous Coal is high, catches fire easily, therefore, can reduce air temperature one time, avoids blasting because using bituminous coal; Adopt back powder milling device, can realize microfine coal preparation, significantly reduce fineness of pulverized coal, increase substantially pulverized coal preparation system and exert oneself (more than 20%), significantly reduce fly ash combustible material, improve the adaptability of boiler combustion to coal.
Compared with existing pulverized coal preparation system, outstanding technical characterstic of the present utility model is:
1. install heat exchanger additional at the female pipe of heat primary air, heat primary air temperature is reduced to 75-160 DEG C above from 300 DEG C, heat transferring medium is condensed water or other.Adopt at the female pipe of heat primary air and install heat exchanger additional, (1) can enter stove ature of coal difference according to boiler, by regulating heat exchanger condensate flow to regulate the female manage-style temperature of heat primary air, improves the adaptability of boiler combustion to ature of coal; (2) in the time entering stove ature of coal and be high-volatile bituminous coal, by regulating heat exchanger condensate flow, heat primary air temperature is reduced to 75-160 DEG C above from 300 DEG C, can prevent coal dust explosion and nozzles, tube cell scaling loss; (3) heat that the female pipe of heat primary air is cemented out by heat exchanger, for heating condensate water, can reduce from the drawing gas of steam turbine, and improves turbine efficiency.(4) in the time entering stove ature of coal and be Low Volatile Lean Coal or anthracite, close the female heat exchange of heat pipe of heat primary air, maintain the female manage-style temperature of heat primary air more than 300 DEG C, system reverts to pulverized coal carried by hot air.(5) adopt heat exchanger, the female manage-style temperature of reduction heat primary air, without impact, directly from primary air fan outlet extracts cold air reduction heat primary air female manage-style temperature and adopt on exhaust gas temperature, can make exhaust gas temperature raise, thereby reduces boiler efficiency.
2. pulverized coal preparation system adopts microfine coal preparation system, and (1) can change and regulate fineness of pulverized coal for ature of coal, improves the adaptability of boiler combustion to ature of coal; (2) improve boiler efficiency, can significantly reduce fineness of pulverized coal owing to returning powder milling device, reduce fly ash combustible material phosphorus content, boiler efficiency improves, in addition, in the time using high-volatile bituminous coal, female heat primary air tubular heat is cemented out to heating condensate water, in the situation that not improving exhaust gas temperature, reduce the low steam use amount adding, rationally utilized the unnecessary heat of the female pipe of heat primary air, improved the economy of unit.In reducing nitrogen oxide, reduce fly ash combustible material, improve boiler efficiency; (3) improve pulverized coal preparation system and exert oneself, reduce unit power consumption of coal pulverizing; (4) reduce the impact of tertiary air on boiler combustion, because tertiary air temperature is low, wind speed is high, has both contained fine powdered coal, contains again steam, and therefore, tertiary air quantity is large, larger on boiler combustion impact.Adopt back powder milling device, can increase substantially pulverized coal preparation system and exert oneself, therefore, boiler runs at full capacity, will reduce milling systems quantity and time, and therefore, tertiary air quantity will significantly decline.(5) improve flyash one-level ash rate, can significantly reduce fineness of pulverized coal owing to returning powder milling device, reduce fly ash combustible material phosphorus content, therefore, flyash one-level ash rate increases substantially, and the effective rate of utilization of flyash also increases substantially, and is conducive to environmental protection.(6) reduce station service power consumption rate, adopt back powder milling device, can significantly reduce fineness of pulverized coal, the required excess air coefficient of coal dust firing reduces, the exhaust gas volumn that boiler combustion generates reduces, and therefore, the power consumption of primary air fan, pressure fan, air-introduced machine and desulphurization and denitration blower fan reduces, simultaneously, the ratio resistance of flyash reduces, and the power consumption of electric cleaner also can reduce, and pulverized coal preparation system unit consumption also can reduce, therefore, station service power consumption rate reduces.(7) reduce discharged nitrous oxides concentration, adopt back powder milling device, can significantly reduce fineness of pulverized coal, therefore, coal dust can carry out anoxycausis under lower excess air coefficient condition, therefore, discharged nitrous oxides concentration reduces, simultaneously, because fineness of pulverized coal significantly reduces, fly ash combustible material reduces, and therefore, discharged nitrous oxides concentration can be lower.
The utility model adopts at the female pipe of heat primary air and installs heat exchanger additional, by heat primary air temperature from more than 300 DEG C, be reduced to 75-160 DEG C, make pulverized coal carried by hot air system to carry safely, reliably high-volatile bituminous coal, in the time using Low Volatile Lean Coal or anthracite, close heat exchanger, recover pulverized coal carried by hot air, realize both burning high-volatile bituminous coal of boiler, burning Low Volatile Lean Coal or anthracite again, expands the adaptability of boiler to coal; Adopt pulverized coal preparation system microfine coal technology of preparing, change according to boiler burning coal, regulate fineness of pulverized coal, improve the adaptability of boiler combustion to ature of coal, improve pulverized coal preparation system and exert oneself, reduce unit power consumption of coal pulverizing.
In a word, the utility model has improved the adaptability of boiler combustion to ature of coal, significantly reduces unit power consumption of coal pulverizing, significantly reduces SCR denitrification apparatus operating cost, improves flyash one-level ash rate, reduces unburned combustible in fly ash, improves boiler efficiency.The utility model also can be applicable to the industry self-supply power plant pulverized-coal fired boiler Reconstruct and designings such as cement, metallurgy, petrochemical industry.
Brief description of the drawings
Fig. 1 is overall structure schematic diagram of the present invention.
In figure: 1-burner hearth; 2-air preheater; 3-pressure fan; 4-feeder; 5-down drying pipe; 6-coal pulverizer; 7-wood block separator; 8-coal dust sorting unit; 9-explosion proof door; 10-fine powder sorting unit; 11-flapper; 12-wood scraps separator; 13-blast pipe road; 14-moisture absorption pipe; 15-spiral powder conveying machine; 16-Pulverized Coal Bin; 17-machine supplying powder; 18-air and powder mixer; 20-primary air fan; 21-weary gas bellows; 22-mill exhauster; 23-secondary air box; 24-coal burner; 25-tertiary air nozzle; 26-heat exchanger; 27-time powder air deflector; 28-time powder milling device; The female pipe of 29-heat primary air; 30-powder retrieving pipe; 31-airduct; 32-recirculation airduct; 33-tertiary-air pipe; 34-large bellows of wind, 35-SOFA wind snout, 36-overfire air port, 37-first cooling by wind air door, 38-recirculation air door, 39-coal pulverizer inlet hot air disperser, 40-coal pulverizer inlet cold-air flap, 41-control valve.
Detailed description of the invention
Below in conjunction with drawings and Examples, the utility model is further illustrated: as shown in the figure, in described coal-burning boiler, store up formula heat primary air heat exchange type and return the powder pulverized coal preparation system of milling, comprise the feeder 4 setting gradually according to flour mill flow, down drying pipe 5, coal pulverizer 6, coal dust sorting unit 8, segmentation sorting unit 10, Pulverized Coal Bin 16, machine supplying powder 17, air and powder mixer 18 and burner hearth 1, described air and powder mixer 18 connects the coal burner 24 of burner hearth through airduct 31, the afterbody of described burner hearth is provided with air preheater 2, after the air heat that air preheater 2 is sent into primary air fan 20, send into the female pipe 29 of heat primary air, add heat exchanger 26 through the female pipe 29 of described heat primary air, be used for regulating control heat primary air temperature, the female pipe 29 of heat primary air after heat exchanger 26 is connected with the large bellows 34 of wind one time before described air and powder mixer 18, the outlet of the described large bellows 34 of wind connects the many heat primary air pipes that are communicated with described air and powder mixer 18.On the basis of pulverized coal carried by hot air pulverized coal preparation system, adopt at the female pipe of heat primary air and install heat exchanger 26 additional, heat primary air heat is cemented out, for heating condensate water or other media, to reduce heat primary air temperature, adapt to use high-volatile bituminous coal.In the time using high-volatile bituminous coal, can, by regulating the cooling medium consumptions such as condensed water, female heat primary air pipe hot blast temperature be reduced to 75-160 DEG C, to adapt to use high-volatile bituminous coal; In the time using Low Volatile Lean Coal or anthracite, heat exchanger to cut out, system switches to pulverized coal carried by hot air.
Further, the powder retrieving pipe 30 of described coal dust sorting unit 8 is connected to back powder air deflector 27 entrances, described time powder air deflector 27 is provided with two outlets, an outlet is connected with an entrance of described down drying pipe 5 by powder retrieving pipe, another outlet connects one and returns powder milling device 28, and described time powder milling device 28 outlets are connected with coal dust sorting unit 8 entrances; Make to be sorted from described coal dust sorting unit 8 powder that returns getting off and enter into described returning after powder milling device 28 circulates and mill through described time powder air deflector 27, send into described coal dust sorting unit 8 and carry out sorting, in the time that described time powder milling device 28 work are broken down or need maintaining, described time powder air deflector 27 will return powder and send into described down drying pipe 5 through powder retrieving pipe; Be transported into fine powder sorting unit 10 from described coal dust sorting unit 8 qualified coal dust out through pipeline and separate, qualified microfine coal enters described Pulverized Coal Bin 16 and stores.The heat transferring medium of described heat exchanger 26 is external condensed water, is provided with control valve 41 at the entrance pipe of external condensed water, for controlling to adjust the outlet temperature of heat primary air or the outlet temperature of condensed water.
Add and reinstall powder milling device 28 at powder retrieving pipe 30, significantly reduce fineness of pulverized coal, adapt to use Low Volatile Lean Coal or anthracite.While using high-volatile bituminous coal, in the time that fineness of pulverized coal remains unchanged substantially, increase substantially pulverized coal preparation system and exert oneself, while using Low Volatile Lean Coal or anthracite, exert oneself remain unchanged in the situation that at pulverized coal preparation system, significantly reduce fineness of pulverized coal.
According to pulverized coal preparation system type selecting directive/guide, low speed coal mill both can grind meager coal, the low-volatile atures of coal such as anthracite, can grind again the feature of the ature of coal wide adaptabilities such as high-volatile bituminous coal, in conjunction with the feature of the ball type pulverizer system, analyze common ground and the difference of pulverized coal carried by hot air and transporting pulverized coal with exhaust gas, on the basis of low speed coal mill the ball type pulverizer system pulverized coal carried by hot air, propose to export the female pipe 29 of heat primary air and install additional at air preheater 2 scheme of heat exchanger 26, adopt condensed water or other media, absorb heat primary air heat, heat primary air temperature is reduced to 75-160 DEG C, so that entering burner hearth 1, pulverized coal conveying burns.Therefore, this system is burning high-volatile bituminous coal both, and also burning Low Volatile Lean Coal or anthracite is the pervasive boiler combustion system of a kind of coal.
Further, the outlet of described fine powder sorting unit 10 connects blast pipe road 13, entrance adjustment doors by mill exhauster 22 is connected with mill exhauster 22, described mill exhauster 22 is provided with two outlets, an outlet is recirculation airduct 32, another outlet is tertiary-air pipe 33, and the end of described recirculation airduct 32 is connected with described down drying pipe 5, and the end of described tertiary-air pipe 33 is connected with the tertiary air nozzle 25 of burner hearth 1; Because tertiary air contains a certain amount of microfine coal, can be used as reducing agent, the reduction of nitrogen oxide that part primary zone is generated, reduces the discharge of nitrogen oxide.
In the time that boiler burning coal switches to meager coal or anthracite by bituminous coal, the heat exchanger 26 that is installed in the female pipe 29 of heat primary air can cut out, system switches to pulverized coal carried by hot air, therefore, this scheme had both been adapted to use bituminous coal, was also adapted to use meager coal, anthracite, and while using bituminous coal, no matter whether pulverized coal preparation system stops transport, and can not affect exhaust gas temperature, and then affect boiler efficiency.
According to as figure embodiment, further illustrate scheme of the present utility model, as shown in the figure, in coal-burning boiler low speed coal mill, store up the female pipe heat exchange type of formula heat primary air pulverized coal carried by hot air, return the powder pulverized coal preparation system of milling, according to flow process be provided with successively run coal bin, feeder 4, down drying pipe 5, coal pulverizer 6, meal sorting unit 8, return powder air deflector 27, return powder milling device 28, segmentation sorting unit 10, mill exhauster 22, Pulverized Coal Bin 16, machine supplying powder 17, be provided with along a wind sequence of batching products: the female pipe 29 of primary air fan 20, air preheater 2, heat primary air, heat exchanger 26, large bellows 34 of wind, air and powder mixer 18, burner hearth 1, pressure fan 3, wherein burner hearth is provided with coal burner 24, overfire air port 36, tertiary air nozzle 25, SOFA wind snout 35, is provided with air preheater 2 at burner hearth 1 afterbody, raw coal is by the described feeder 4 of described run coal bin process and be provided with coal pulverizer inlet cold-air flap 40, hot air disperser 39, recirculation air door 38 is connected with down drying pipe, dry, mix, then enter described coal pulverizer 6, mill through coal pulverizer 6, wind powder mixture is through described coal dust sorting unit 8 sortings, qualified coal dust is carried and enters segmentation sorting unit 10, separate through fine powder sorting unit 10, qualified coal dust falls into described Pulverized Coal Bin and stores, defective coal dust returns powder through returning powder air deflector 27, or enter back powder milling device 28, after again milling, Hui Fenyu enters together coal dust sorting unit 8 from the wind powder mixture of coal pulverizer outlet and carries out sorting again, or through returning powder air deflector 27 and powder retrieving pipe 30, entering coal pulverizer 6 mills again, from fine powder sorting unit 10 out, the weary gas that comprises microfine coal and steam is sent into burner hearth 1 as tertiary air and is participated in burning after mill exhauster 22 boosts, air, after primary air fan 20 boosts, heats through air preheater 2, becomes heat primary air, enters the female pipe 29 of heat primary air, and through heat exchanger 26, heat primary air temperature is reduced to 75-160 DEG C above from 300 DEG C, enters the large bellows 34 of wind one time, be stored in the coal dust of Pulverized Coal Bin 16 after described machine supplying powder 17, with cooling after heat primary air in the interior heating of air and powder mixer 18, mix, send into described hearth combustion by an airduct by coal burner 24.In the time entering stove coal and be meager coal or anthracite, the heat exchanger 26 that is installed in the female pipe 29 of heat primary air cuts out, and the heat primary air temperature heating through air preheater 2 is that more than 300 DEG C pulverized coal preparation system switches to pulverized coal carried by hot air; Install heat exchanger 26 additional at the female pipe of heat primary air 29 correct positions, in the time that boiler uses high-volatile bituminous coal, open heat exchanger 26, the part heat that heat primary air is carried cements out, heating condensate water or other media, heat primary air temperature is reduced to after 75-160 DEG C, can safe transport coal dust.In the time that boiler burning coal is Low Volatile Lean Coal or anthracite, close the female pipe of heat primary air 29 heat exchangers 26, maintaining the female pipe of heat primary air 29 wind-warm syndrome is that more than 300 DEG C pulverized coal preparation system switches to pulverized coal carried by hot air.
The powder outlet that returns of described coal dust sorting unit 8 connects powder air deflector 27 one time, described time powder air deflector 27 is provided with two outlets, an outlet is connected with an entrance of down drying pipe 5 by powder retrieving pipe 30, another outlet connects one and returns powder milling device 28, and described time powder milling device 28 outlets are connected with coal dust sorting unit 8 entrances; Make to be sorted from described coal dust sorting unit the powder that returns getting off and enter into described returning after powder milling device 28 circulates and mill through described time powder air deflector 27, send into described coal dust sorting unit 8 and carry out sorting, in the time that described time powder milling device 28 work are broken down or need maintaining, described time powder air deflector 27 will return powder and send into described powder retrieving pipe 30; Be transported into fine powder sorting unit 10 from described coal dust sorting unit 8 qualified microfine coal out through pipeline and separate, qualified microfine coal enters described Pulverized Coal Bin 16 and stores.
Described fine powder sorting unit 10 outlets connect blast pipe road 13, are connected with mill exhauster 22 through mill exhauster 22 entrance adjustment doors, and mill exhauster is provided with two outlets, and an outlet is described recirculation airduct 32, and another outlet is tertiary-air pipe 33; Make from described fine powder sorting unit 10 weary gas out, enter mill exhauster 22 through blast pipe road, and after mill exhauster 22 boosts, one tunnel enters described down drying pipe 5 as reduced air, regulates coal pulverizer ventilation and outlet temperature, and another road enters described burner hearth 1 as tertiary air through the tertiary air spout 25 on described burner hearth 1, because tertiary air contains a certain amount of microfine coal, can be used as reducing agent, the reduction of nitrogen oxide that part primary zone is generated, reduces discharged nitrous oxides.
Described pressure fan 3 intake airs are after pressure fan 3 boosts, be heated as hot Secondary Air through air preheater 2, described hot Secondary Air is along hot secondary air duct, and a part is delivered to the overfire air port 36 of described burner hearth 1, and the primary zone that enters burner hearth 1 participates in the anoxycausis of low NOx; Another part is sent into the SOFA wind snout 35 of burner hearth 1, as SOFA after-flame wind, unburnt carbon is burnt away, to reduce unburned combustible in fly ash.
Enter the hot Secondary Air in the primary zone of burner hearth 1, by regulating secondary air register aperture, supplement partial oxidation in main combustion zone, assist and maintain primary zone coal dust under fuel-rich material operating mode, i.e. smooth combustion under the operating mode of anoxic, to reduce discharged nitrous oxides concentration; Another part, as SOFA after-flame wind, burns away unburnt carbon under the anoxic operating mode of primary zone, reduces unburned combustible in fly ash.
The air that enters primary air fan 20 is entered by primary air fan 20 inlet tubes, boosts, after heat temperature raising, by the female pipe 29 of described heat primary air, after heat exchanger 26 coolings, enters the large bellows 34 of a described wind through described primary air fan 20.Draw many heat primary air pipes 31 from large bellows 34 outlets of a described wind, be communicated with corresponding air and powder mixer 18 respectively; Heat primary air after cooling is after described air and powder mixer 18 mixes, heats with coal dust, be transported to described coal burner 24 through heat primary air pipe 31, make wind and high-volatile pulverized bituminous coal be mixed to form inflammable primary wind and powder mixture, can realize lower excess air coefficient coal dust firing at primary combustion zone, reach the object that reduces nitrogen oxide.
This programme both can grind the low-volatile such as meager coal, anthracite ature of coal for low speed coal mill, can grind again the feature of the ature of coal wide adaptabilities such as high-volatile bituminous coal, in conjunction with the feature of the ball type pulverizer system, analyze common ground and the difference of pulverized coal carried by hot air and transporting pulverized coal with exhaust gas, on the basis of low speed coal mill the ball type pulverizer system pulverized coal carried by hot air, adopt at the female pipe of heat primary air and install heat exchanger additional, add and reinstall powder air deflector and return the technical measures such as powder milling device at powder retrieving pipe, there is following features:
a. ature of coal wide adaptability
This scheme is installed in the heat exchanger on the female pipe of heat primary air by switch, can switch using between high-volatile bituminous coal and Low Volatile Lean Coal or anthracite, ature of coal wide adaptability, is the pervasive boiler combustion modification scheme of a kind of ature of coal, has desalinated boiler combustion designing coal quality concept.
improve boiler efficiency
Can significantly reduce fineness of pulverized coal owing to returning powder milling device, reduce fly ash combustible material phosphorus content, boiler efficiency improves, in addition, and in the time using high-volatile bituminous coal, female heat primary air tubular heat is cemented out, heating condensate water, in the situation that not improving exhaust gas temperature, has reduced the low steam use amount adding, rationally utilize the unnecessary heat of the female pipe of heat primary air, improved the economy of unit.
reduce the impact of tertiary air on boiler combustion
Because tertiary air temperature is low, wind speed is high, has both contained fine powdered coal, contains again steam, and therefore, tertiary air quantity is large, larger on boiler combustion impact.Adopt back powder milling device, can increase substantially pulverized coal preparation system and exert oneself, therefore, boiler runs at full capacity, will reduce milling systems quantity and time, and therefore, tertiary air quantity will significantly decline.
reduce discharged nitrous oxides concentration
Adopt back powder milling device, can significantly reduce fineness of pulverized coal, therefore, coal dust can carry out anoxycausis under lower excess air coefficient condition, therefore, discharged nitrous oxides concentration reduces, meanwhile, because fineness of pulverized coal significantly reduces, fly ash combustible material reduces, therefore, discharged nitrous oxides concentration can be lower.
reduce station service power consumption rate
Adopt back powder milling device, can significantly reduce fineness of pulverized coal, the required excess air coefficient of coal dust firing reduces, and the exhaust gas volumn that boiler combustion generates reduces, therefore, the power consumption of primary air fan, pressure fan, air-introduced machine and desulphurization and denitration blower fan reduces, and meanwhile, the ratio resistance of flyash reduces, the power consumption of electric cleaner also can reduce, pulverized coal preparation system unit consumption also can reduce, and therefore, station service power consumption rate reduces.
improve flyash one-level ash rate
Can significantly reduce fineness of pulverized coal owing to returning powder milling device, reduce fly ash combustible material phosphorus content, therefore, flyash one-level ash rate increases substantially, and the effective rate of utilization of flyash also increases substantially, and is conducive to environmental protection.
Claims (6)
1. in a coal-burning boiler, store up formula heat primary air heat exchange type and return the powder pulverized coal preparation system of milling, comprise the feeder (4) setting gradually according to flour mill flow, down drying pipe (5), coal pulverizer (6), meal sorting unit (8), segmentation sorting unit (10), Pulverized Coal Bin (16), machine supplying powder (17), air and powder mixer (18) and burner hearth (1), wherein burner hearth (1) is provided with coal burner (24), overfire air port (36), tertiary air spout (25), SOFA wind snout (35), described air and powder mixer (18) connects the coal burner (24) of burner hearth through an airduct (31), the afterbody of described burner hearth is provided with air preheater (2), after the air heat that air preheater (2) is sent into primary air fan (20), send into the female pipe of heat primary air (29), it is characterized in that: add heat exchanger (26) through the female pipe of described heat primary air (29), be used for regulating control heat primary air temperature, the female pipe of heat primary air (29) after heat exchanger (26) is at the front large bellows of wind (34) that are connected with of described air and powder mixer (18), the outlet of the described large bellows of wind (34) connects the many heat primary air pipes (31) that are communicated with described air and powder mixer (18).
2. in coal-burning boiler according to claim 1, store up formula heat primary air heat exchange type and return the powder pulverized coal preparation system of milling, it is characterized in that: the powder retrieving pipe (30) of described meal sorting unit (8) is connected to back powder air deflector (27) entrance, described time powder air deflector (27) is provided with two outlets, an outlet is connected with an entrance of described down drying pipe (5) by powder retrieving pipe, another outlet connects one and returns powder milling device (28), and described time powder milling device (28) outlet is connected with meal sorting unit (8) entrance; Make from described meal sorting unit (8) be sorted get off return powder after described time powder air deflector (27) enters into described time powder milling device (28) and circulate and mill, send into described coal dust sorting unit (8) and carry out sorting, in the time that described time powder milling device (28) work is broken down or needs maintaining, described time powder air deflector (27) will return powder and send into described down drying pipe (5) through powder retrieving pipe; Be transported into fine powder sorting unit (10) from described meal sorting unit (8) qualified coal dust out through pipeline and separate, qualified microfine coal enters described Pulverized Coal Bin (16) and stores.
3. in coal-burning boiler according to claim 2, store up formula heat primary air heat exchange type and return the powder pulverized coal preparation system of milling, it is characterized in that: the outlet of described fine powder sorting unit (10) connects blast pipe road (13), entrance adjustment doors by mill exhauster (22) is connected with mill exhauster (22), described mill exhauster (22) is provided with two outlets, an outlet connects recirculation airduct (32), another outlet connects tertiary-air pipe (33), the end of described recirculation airduct (32) is connected with described down drying pipe (5), the end of described tertiary-air pipe (33) is connected with the tertiary air nozzle (25) of burner hearth (1), make from described fine powder sorting unit (10) weary gas out, enter mill exhauster through blast pipe road, and after mill exhauster boosts, one tunnel enters described down drying pipe (5) as reduced air through recirculation air door (38), another road enters burner hearth (1) as tertiary air through the tertiary air nozzle (25) on described burner hearth (1), because tertiary air contains a certain amount of morning and evening tides coal dust, and can be as reducing agent, the reduction of nitrogen oxide that part primary zone is generated, to reduce the discharge of nitrogen oxide.
4. in coal-burning boiler according to claim 1, store up formula heat primary air heat exchange type and return the powder pulverized coal preparation system of milling, it is characterized in that: the heat transferring medium of described heat exchanger (26) is external condensed water, be provided with control valve (41) at the entrance pipe of external condensed water, for controlling to adjust the outlet temperature of heat primary air or the outlet temperature of condensed water, close control valve (41), this pulverized coal preparation system switches to pulverized coal carried by hot air, can carry Low Volatile Lean Coal or anthracite, make this system applicable to the pervasive coal using from high-volatile bituminous coal to low-grade anthracite coal.
5. in coal-burning boiler according to claim 1, store up formula heat primary air heat exchange type and return the powder pulverized coal preparation system of milling, it is characterized in that: described air preheater (2) is also connected with pressure fan (3), air heat after air preheater (2) boosts pressure fan (3) becomes hot Secondary Air, described hot Secondary Air is along hot secondary air duct, a part is delivered to the described overfire air port (36) of burner hearth (1), and the primary zone that enters burner hearth (1) participates in the anoxycausis of low NOx; Another part is sent into the SOFA wind snout (35) of burner hearth (1), as SOFA after-flame wind, unburnt carbon is burnt away, to reduce unburned combustible in fly ash.
6. in coal-burning boiler according to claim 1, store up formula heat primary air heat exchange type and return the powder pulverized coal preparation system of milling, it is characterized in that: the outlet after described primary air fan (20) boosts air is heated without air preheater (2), being provided with pipeline is connected with the female pipe of heat primary air (29) through first cooling by wind air door (37), need to overhaul for going wrong when described heat exchanger (26) operation time, open first cooling by wind air door (37), a cold wind is mixed at a female pipe of wind with heat primary air, to reduce heat primary air temperature, carry high-volatile bituminous coal.
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Effective date of registration: 20220105 Address after: 210033 east section 04f, building C5, Hongfeng Science Park, Nanjing Economic and Technological Development Zone, Nanjing, Jiangsu Province Patentee after: Nanjing frost Environmental Protection Technology Co.,Ltd. Address before: 710075 room 205, floor 2, Jiabei building, No. 66, Keji Second Road, high tech Zone, Xi'an, Shaanxi Province Patentee before: Huang Lixin |
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