CN104315502A - Biomass low-temperature pre-burning low-volatile inferior coal low-NOx combustion device - Google Patents
Biomass low-temperature pre-burning low-volatile inferior coal low-NOx combustion device Download PDFInfo
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- CN104315502A CN104315502A CN201410554792.7A CN201410554792A CN104315502A CN 104315502 A CN104315502 A CN 104315502A CN 201410554792 A CN201410554792 A CN 201410554792A CN 104315502 A CN104315502 A CN 104315502A
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Abstract
The invention discloses a biomass low-temperature pre-burning low-volatile inferior coal low-NOx combustion device. The combustion device utilizes biomass to substitute high-price high-quality fuel gas as pre-burning fuel, the biomass is partially combusted in a combustion chamber so as to provide heat for the combustion chamber, and the combustion temperature is maintained at about 800 DEG C. The biomass is pyrolyzed at the temperature of about 800 DEG C, part of the volatile component generated by virtue of the pyrolysis is combusted, and part of the volatile component enters a hearth to be combusted. The low-volatile inferior coal is heated to 650 to 800 DEG C in a preheating chamber, so that the combustion stability of the low-volatile inferior coal in the hearth can be improved. By adopting the combustion device, the emission amount of CO2 and NOx can be reduced, and contribution can be made for alleviating the global warming and reduction of acid rain, photochemical smog and haze caused by the greenhouse effect. Finally, the combustion performance of the low-volatile inferior coal can be improved, the combustion efficiency can be improved, the contribution is made for the increasing of the economic benefit, and the saving of the energy for enterprises.
Description
Technical field
The invention belongs to Thermal Energy and Power Engineering technical field, relate to a kind of burner, be specifically related to the low NO of a kind of living beings low temperature pre-burning low volatile low-grade coal
xburner.
Background technology
Biomass energy is a kind of regenerative resource.Have a very wide distribution, output is large, it is estimated that the biomass dry weight of annual growth can reach 1,400 hundred million ~ 1,800 hundred million tons.But 1% of the not enough total amount of the current living beings as the energy, therefore the application potential of living beings is very huge.Although living beings also generate CO in combustion
2, but a large amount of CO has been absorbed in its generative process
2, biomass burning is for whole atmospheric CO
2increase do not contribute, and applying biological matter replace fossil fuel effectively can reduce CO
2discharge.
China take coal as the country of main energy sources, and territory is vast simultaneously, and colliery is numerous, and coal contains each rank coal from high-order coal to low-order coal such as anthracite, bituminous coal, brown coal and mud coal.According to the quality standard of China's generating pulverized-coal fired boiler coal, the coal that dry ash free basis volatile matter is less than 20% is low-volatite coal.According to statistics, the low volatile such as anthracite, meager coal low-grade coal account for that China thermal coal consumes more than 20%.Along with the anthracitic further exploitation of southeast Shanxi and Chuan Nan the west of Guizhou Province, the boiler share using anthracitic generating also can constantly increase.The general ignition difficulties of boiler of current low volatile low-grade coal, NO
xdischarge high feature.
NO
xone of arch-criminal causing extensive haze in recent years, NO in addition
xalso can bring out the series of environmental problems such as photochemical fog, acid rain, and coal-burning boiler is China NO
xone of main source of discharge, through effort dust for many years and SO
xpollution control achieves very large effect, but NO
xemission control also backwardness relatively.According to the latest data of Chinese Ministry of Environmental Protection, national annual discharged nitrous oxides total amount 2337.8 ten thousand tons in 2012, thermoelectricity discharge accounts for 35% ~ 40%, brings serious threat to our environment.Therefore country has formulated more and more stricter controlling measurement NO
xdischarge.Up-to-date " fossil-fuel power plant atmospheric pollutant emission standard GB13223-2011 " NO
xdischarge standard is all stricter than America and Europe, the NO of coal-burning boiler
xdischarge capacity is less than 100mg/m
3.
The pre-combustion technology of coal dust low temperature is the low NO grown up in recent years
xcombustion technology, before coal dust enters burner, first flow into the reducing atmosphere combustion chamber of a gas heating, in combustion chamber, coal dust is by rapidly pre-warming to about 800 DEG C, discharges the volatile matter of a large amount of nitrogenate, and partial combustion, for combustion chamber provides major heat.Under this reducing atmosphere, nitrogen oxide is reduced into N
2, effectively reduce NO
xdischarge.In addition because coal dust is before entering hearth combustion, be preheating to higher temperature, the problem of low volatile low-grade coal ignition difficulties can be solved.
Due to living beings, to have volatile matter high, and carbon activity is high, is easy to ablaze feature.Living beings are used to replace the expensive gaseous fuel of high-quality to carry out preheating to low volatilization low-grade coal, more economical.The a large amount of volatile matters simultaneously discharged due to living beings can generate in the precombustion chamber of low-oxygen environment has NO in a large number
xthe charcoal cigarette (soot) of reducing power, before entering hearth combustion, these charcoal cigarettes evenly mix with the coal dust be preheated.By reasonably organizing stove combustion, the NO that these charcoal cigarettes can be effectively newly-generated in reduction furnace
x, reach and reduce NO
xthe object of discharge.
Summary of the invention
The object of the present invention is to provide a kind of for improving low volatile low-grade coal coal dust firing stability and reducing NO
xthe low NO of living beings low temperature pre-burning low volatile low-grade coal of discharge
xburner, coal dust intermixture is sent in the mist of burner hearth oxygenous hardly by this burner, is beneficial to and organizes coal dust high-temperature and low-oxygen combustion in burner hearth, reduce NO further
xthe discharge of pollutant.
For achieving the above object, the technical solution used in the present invention is:
A kind of living beings low temperature pre-burning low volatile low-grade coal low NOx combustion apparatus, comprise at least one boiler secondary air entrance, boiler secondary air entrance is connected with the precombustion chamber surrounded by precombustion chamber inner housing, on precombustion chamber inner housing, cover has the precombustion chamber shell body of bottom opening; The porch of precombustion chamber is set with central tube, living beings First air sleeve, precombustion chamber Secondary Air sleeve and coal dust First air sleeve from the inside to the outside successively; Ignition system is stretched into by the end of central tube; Precombustion chamber is also provided with for Real-Time Monitoring burning in flame status infra red flame checkout gear and peep fiery device;
The side opening of living beings First air sleeve is provided with living beings First air entrance, and the side opening of precombustion chamber Secondary Air sleeve is provided with precombustion chamber Secondary Air entrance, and the side opening of coal dust First air sleeve is provided with coal dust First air entrance; The mixture of biomass fuel and air is sent into by living beings First air entrance, and flows in circular passage between living beings First air sleeve and core pipe; Precombustion chamber Secondary Air flows in the circular passage between precombustion chamber Secondary Air sleeve and living beings First air sleeve; Coal dust flows in the circular passage between coal dust First air sleeve and precombustion chamber Secondary Air sleeve.
Described ignition system comprises fuel delivery means and is arranged on the igniter below fuel delivery means, the rear end of fuel delivery means and igniter is connected with and seesaws in central tube for carrying fuel conveying device and igniter, to extend the propeller of fuel delivery means and igniter service life.
Described fuel delivery means adopts oil gun or gas ignition rifle.
Described living beings First air barrel forward end exit is provided with internal tooth form flame holder for improving biomass fuel combustion stability and external tooth form flame holder; Wherein, internal tooth form flame holder is arranged at the inner side of living beings First air barrel forward end outlet, and external tooth form flame holder is arranged at the outside of living beings First air barrel forward end outlet.
The outlet of described precombustion chamber Secondary Air sleeve is provided with the enlarging of precombustion chamber Secondary Air, and precombustion chamber Secondary Air enlarging front end has expanded outwardly angle.
The middle part inwall of described coal dust First air sleeve is provided with outer Pulverized Coal Concentration ring coal dust being separated into interior light outer dense type air-flow; The front end exit place of precombustion chamber Secondary Air sleeve is set with coal powder light-dark separator tube, and precombustion chamber Secondary Air sleeve outer wall is provided with coal dust is separated into Pulverized Coal Concentration ring in outer light interior dense type air-flow, interior Pulverized Coal Concentration ring is positioned at coal powder light-dark separator tube; The air-flow that outer Pulverized Coal Concentration ring and coal powder light-dark separator tube are dense centered by being divided by the coal dust spraying into preheating chamber, both sides are light.
Described precombustion chamber inner housing adopts the heat-resisting steel material reducing precombustion chamber radiation loss.
Aluminosilicate refractory fiber is filled with between described precombustion chamber inner housing and precombustion chamber shell body.
The top of the Secondary Air entrance of described boiler arranges burnout degree entrance, forms territory, primary zone and after-flame region in Secondary Air entrance and boiler corresponding to burnout degree entrance; After-flame region is positioned at the top in combustion-supporting region.
Compared with prior art, the present invention has following beneficial effect:
The present invention uses living beings to replace expensive high-quality fuel gas to act as simmering fuel, and living beings, at combustion chamber divided combustion, for combustion chamber provides heat, make the temperature of burning maintain about 800 DEG C.Biomass fermentation heat-dissipating solution at such a temperature, pyrogenous origin volatile matter partial combustion, part enters burner hearth with coal dust, and then burns.Low volatile low-grade coal is heated between 650 ~ 800 DEG C in precombustion chamber, improves the stability of low volatile low-grade coal in burner hearth combustion.Structurally, the present invention installs precombustion chamber on boiler secondary air entrance, and is set with central tube, living beings First air sleeve, precombustion chamber Secondary Air sleeve and coal dust First air sleeve from the inside to the outside successively in the porch of precombustion chamber; Precombustion chamber Secondary Air is arranged between breeze airflow and living beings air-flow, improves the stability of biomass fuel combustion, make biomass fuel anaerobic environment lower part burning in precombustion chamber, generate and in a large number there is NO
xthe charcoal cigarette (soot) of reduction characteristic, before these soot particulates (soot) enter hearth combustion, even dispersion is between pulverized coal particle, by reasonably organizing stove combustion, these charcoal cigarettes (soot) effectively can reduce coal dust at the newly-generated NO of stove combustion
xpollutant.The present invention can reduce CO
2, NO
xdischarge, contribute for slowing down global warming that greenhouse effects cause and reducing acid rain, photochemical fog and haze.Finally, the present invention can improve the combustibility of low volatile low-grade coal, improves efficiency of combustion, can for enterprise increase economic efficiency and economize energy contribute.
Further, the present invention is provided with high energy ignition unit, oil gun or gas ignition rifle and infra red flame monitoring device, improves the stability of the gentle monitoring burning of Automated water.
Further, the present invention is provided with propeller at the end of oil gun or gas ignition rifle and igniter, and when needs are lighted a fire, propeller runs forward an oil gun or gas ignition rifle and high-energy igniter and delivers to ignition location.After igniting terminates, propeller runs backward, and oil gun and high-energy igniter are shunk back central tube, avoids high temperature to wash away, corrodes and coking pollution.Extend the service life of oil gun or gas ignition rifle and high energy ignition unit.
Further, the present invention arranges interior external tooth form flame holder in the outlet of biomass fuel, precombustion chamber Secondary Air export expansion certain angle, and interior Pulverized Coal Concentration ring, outer Pulverized Coal Concentration ring and coal powder light-dark separator tube are set in the circular passage that breeze airflow flows through, further increase the stability of biomass fuel combustion; Meanwhile, interior Pulverized Coal Concentration ring, outer Pulverized Coal Concentration ring and coal powder light-dark separator tube are dense centered by dividing after making coal dust spray into precombustion chamber, the air-flow that both sides are light.
Further, the present invention fills aluminosilicate refractory fiber between precombustion chamber inner housing and precombustion chamber shell body, decreases the radiation loss of precombustion chamber.
Accompanying drawing explanation
Fig. 1 is overall structure schematic diagram of the present invention;
Fig. 2 is the structural representation of external tooth form flame holder in the present invention;
Fig. 3 is the structural representation that the present invention is installed on boiler combustion system.
Wherein, 1 is igniter; 2 is fuel delivery means; 3 is propeller; 4 is core pipe; 5 is living beings First air sleeve; 6 is precombustion chamber Secondary Air entrance; 7 is precombustion chamber Secondary Air sleeve; 8 is coal dust First air sleeve; 9 is outer Pulverized Coal Concentration ring; 10 is coal powder light-dark separator tube; 11 is infra red flame monitoring device; 12 for peeping fiery device; 13 is precombustion chamber shell body; 14 is precombustion chamber inner housing; 15 is precombustion chamber; 16 is external tooth form flame holder; 17 is internal tooth form flame holder; 18 is the enlarging of precombustion chamber Secondary Air; 19 is interior Pulverized Coal Concentration ring; 20 is coal dust First air entrance; 21 is living beings First air entrance; 22 is Secondary Air entrance; 23 is burnout degree entrance.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is described in further detail:
See Fig. 1 to Fig. 3, the present invention includes at least one boiler secondary air entrance 22, boiler secondary air entrance 22 is connected with the precombustion chamber 15 surrounded by precombustion chamber inner housing 14, the top of the Secondary Air entrance 22 of boiler arranges burnout degree entrance 23, forms territory, primary zone and after-flame region in the boiler of Secondary Air entrance 22 and burnout degree entrance 23 correspondence; After-flame region is positioned at the top in combustion-supporting region.On precombustion chamber inner housing 14, cover has the precombustion chamber shell body 13 of bottom opening; Precombustion chamber inner housing 14 adopts the heat-resisting steel material reducing precombustion chamber 15 radiation loss.Aluminosilicate refractory fiber is filled with between precombustion chamber inner housing 14 and precombustion chamber shell body 13.Precombustion chamber 15 be also provided with for infra red flame checkout gear 11 and peep fiery device 12.The porch of precombustion chamber 15 is set with central tube 4, living beings First air sleeve 5, precombustion chamber Secondary Air sleeve 7 and coal dust First air sleeve 8 from the inside to the outside successively; Ignition system is stretched into by the end of central tube 4; Ignition system comprises fuel delivery means 2 and is arranged on the igniter 1 below fuel delivery means 2, the rear end of fuel delivery means 2 and igniter 1 is connected with and seesaws in central tube 4 for carrying fuel conveying device 2 and igniter 1, to extend the propeller 3 of fuel delivery means 2 and igniter 1 service life.Fuel delivery means 2 adopts oil gun or gas ignition rifle.
The side opening of living beings First air sleeve 5 is provided with living beings First air entrance 21, and living beings First air sleeve 5 front end exit place is provided with internal tooth form flame holder 17 for improving biomass fuel combustion stability and external tooth form flame holder 16; Wherein, internal tooth form flame holder 17 is arranged at the inner side of living beings First air sleeve 5 front end exit, and external tooth form flame holder 16 is arranged at the outside of living beings First air sleeve 5 front end exit.The side opening of precombustion chamber Secondary Air sleeve 7 is provided with precombustion chamber Secondary Air entrance 6, and the outlet of precombustion chamber Secondary Air sleeve 7 is provided with precombustion chamber Secondary Air enlarging 18, and precombustion chamber Secondary Air enlarging 18 front end has expanded outwardly angle.The side opening of coal dust First air sleeve 8 is provided with coal dust First air entrance 20; The middle part inwall of coal dust First air sleeve 8 is provided with the outer Pulverized Coal Concentration ring 9 coal dust being separated into interior light outer dense type air-flow; The front end exit place of precombustion chamber Secondary Air sleeve 7 is set with coal powder light-dark separator tube 10, precombustion chamber Secondary Air sleeve 7 outer wall is provided with coal dust is separated into Pulverized Coal Concentration ring 19 in outer light interior dense type air-flow, interior Pulverized Coal Concentration ring 19 is positioned at coal powder light-dark separator tube 10; The air-flow that outer Pulverized Coal Concentration ring 9 and coal powder light-dark separator tube 10 are dense centered by being divided by the coal dust spraying into preheating chamber 15, both sides are light.The mixture of biomass fuel and air is sent into by living beings First air entrance 21, and flows in circular passage between living beings First air sleeve 5 and core pipe 4; Precombustion chamber Secondary Air flows in the circular passage between precombustion chamber Secondary Air sleeve 7 and living beings First air sleeve 5; Coal dust flows in the circular passage between coal dust First air sleeve 8 and precombustion chamber Secondary Air sleeve 7.
Principle of the present invention:
The present invention uses living beings to replace expensive high-quality fuel gas to act as simmering fuel, and living beings, at combustion chamber divided combustion, for combustion chamber provides heat, make the temperature of burning maintain about 800 DEG C.Biomass fermentation heat-dissipating solution at such a temperature, pyrogenous origin volatile matter partial combustion, part enters burner hearth with coal dust, and then burns.Low volatile low-grade coal is heated between 650 ~ 800 DEG C in precombustion chamber, improves the stability of low volatile low-grade coal in burner hearth combustion.
Definition living beings input quality percentage is s%, and living beings As-received volatile matter content is
the As-received volatile matter content of low volatile low-grade coal is
in order to obtain good denitration efficiency, then require:
in order to ensure the low-oxygen environment in precombustion chamber, require:
That is total in preheating chamber excess air coefficient λ is less than 0.2.
Living beings in precombustion chamber under anaerobic environment pyrolysis and combustion λ <0.2, a large amount of charcoal cigarette soot can generate under this anoxycausis environment and preserve.Before these soot particulates soot enters hearth combustion, even dispersion is between pulverized coal particle, and by reasonably organizing stove combustion, these charcoal cigarettes soot effectively can reduce coal dust at the newly-generated NO of stove combustion
xpollutant.Due to Air compress pump λ <0.2 in precombustion chamber, the oxygen in preheating chamber is almost run out by biomass combustion.Therefore pulverized coal conveying, charcoal cigarette, unburned volatilization grade enter burner hearth mist in hardly containing oxygen, be beneficial to and organize coal dust high-temperature and low-oxygen combustion in burner hearth, reduce NO further
xthe discharge of pollutant.
The present invention can apply face-fired boiler turbulent burner, also can be applied to the DC burner of tangentially firing boiler.No matter be applied to opposed firing or tangentially firing boiler, in order to obtain good denitration efficiency, the Air compress pump λ <1.0 in primary zone, arranges burnt zone above primary zone, burns Air compress pump λ >1.0.
In order to improve the stabilizer of the gentle monitoring burning of Automated water, the present invention is equipped with high energy ignition unit, oil gun or gas ignition rifle and infra red flame monitoring device.In order to extend the service life of oil gun and high energy ignition unit, be equipped with propeller.When needs are lighted a fire, propeller runs forward an oil gun and ignition location delivered to by high-energy igniter.But after igniting terminates, propeller runs backward, and oil gun and high-energy igniter are shunk back central tube, avoids high temperature to wash away, corrode and coking is polluted.
In order to improve the stability of biomass fuel combustion further, the present invention arranges interior external tooth form flame holder in the outlet of biomass fuel; Meanwhile, precombustion chamber Secondary Air is set between breeze airflow and living beings air-flow; Secondly, precombustion chamber Secondary Air export expansion has certain angle; Finally, arrange interior Pulverized Coal Concentration ring, when breeze airflow and interior concentrated ring clash into, due to effect of inertia, coal dust is separated into interior light outer dense type air-flow.Wash away precombustion chamber wall to reduce pulverized coal particle, outer Pulverized Coal Concentration ring is set.When breeze airflow and interior concentrated ring clash into, due to effect of inertia, coal dust is separated into outer light interior dense type air-flow.Owing to arranging inside and outside Pulverized Coal Concentration ring and coal powder light-dark separator tube, then coal dust sprays into centered by after preheating chamber dense, the air-flow that both sides are light.Because ignition temperature of the present invention is relatively low, precombustion chamber inner housing adopts heat resisting steel material.In order to reduce the radiation loss of precombustion chamber, between the inner and outer shell of precombustion chamber, fill the efficient heat-resistant insulation materials such as aluminosilicate refractory fiber.
The course of work of the present invention:
First, precombustion chamber Secondary Air is sent into by precombustion chamber Secondary Air entrance 6, precombustion chamber Secondary Air flows in the circular passage between precombustion chamber Secondary Air sleeve 7 and living beings First air sleeve 5, and enters in precombustion chamber 15, to precombustion chamber through the row purging of more than 1 minute.
Then propeller 3 is run forward, high energy ignition unit 1 and oil gun or gas ignition rifle are sent into and instructs ignition location.High energy ignition unit 1 works, and ignite oil gun or gas ignition rifle.Sent into by precombustion chamber Secondary Air entrance 6 by precombustion chamber Secondary Air, precombustion chamber Secondary Air flows in the circular passage between precombustion chamber Secondary Air sleeve 7 and living beings First air sleeve 5, and enters in precombustion chamber 15.
Sent into the mixture of biomass fuel and air by living beings First air entrance 21, this mixture flows in the circular passage between living beings First air sleeve 5 and core pipe 4, enters after precombustion chamber until it, and calorific value occurs, and by flame ignition that oil gun 2 is formed.Interior external tooth form flame holder 16,17 and precombustion chamber Secondary Air enlarging 18 make biomass fuel smooth combustion.
After room temperature to be combusted reaches 800 DEG C, coal dust is sent into by coal dust First air entrance 20, coal dust flows in the circular passage between coal dust First air sleeve 8 and precombustion chamber Secondary Air sleeve 7, due to about inertia, be separated into dense, the two-layer light breeze airflow in center by interior Pulverized Coal Concentration ring 19 and outer Pulverized Coal Concentration ring 9 and coal powder light-dark separator tube 10.
Breeze airflow is preheating to 650 DEG C ~ 800 DEG C after entering combustion chamber.What biomass pyrolytic was formed has NO
xa large amount of charcoal cigarettes of reduction characteristic, because in preheating chamber 15, Air compress pump is less than 0.2, oxygen wretched insufficiency, is preserved.Imperfect combustion pyrolysis gas of biomass, there is NO
xa large amount of charcoal cigarette soot and the granuloplastic mixture of low volatile pulverized coal be preheated of reduction characteristic, at the second half section Homogeneous phase mixing of precombustion chamber, then send into hearth combustion.
After precombustion chamber flameholding, propeller 3 action, by oil gun or gas ignition rifle and high energy ignition unit retraction central tube 2, to extend its service life.Infra red flame monitoring device 11 is by peeping the flame status in the burning of fiery device 12 Real-Time Monitoring simultaneously, when there is fire extinguishing, gives the alarm, and stops the input of biomass fuel and coal dust in time, re-executes purging and ignition operation.
Imperfect combustion pyrolysis gas of biomass, there is NO
xa large amount of charcoal cigarette (soot) of reduction characteristic and the granuloplastic mixture of low volatile pulverized coal be preheated, after sending into hearth combustion.Extend charcoal cigarette (soot) time of staying in burner hearth as much as possible, play its denitration ability, because the oxidation rate of charcoal cigarette (soot) under high oxygen concentration is far above its reductive NO
xspeed.Therefore by regulating the ratio of Secondary Air 22 and burnout degree 23, make the Air compress pump λ <1.0 in primary zone, the Air compress pump λ >1.0 of burning-out zone.
The present invention also has the following advantages:
The invention provides that a set of combustion stability is good, NO
xdischarge low living beings low temperature pre-burning low volatile low-grade coal burner.This burner adopts living beings to provide heat for low temperature precombustion chamber, and living beings are the burning of anaerobic environment lower part in precombustion chamber, generates and has NO in a large number
xthe charcoal cigarette (soot) of reduction characteristic, before these soot particulates (soot) enter hearth combustion, even dispersion is between pulverized coal particle, by reasonably organizing stove combustion, these charcoal cigarettes (soot) effectively can reduce coal dust at the newly-generated NO of stove combustion
xpollutant.Low volatile low-grade coal is preheating between 650 ~ 800 DEG C in precombustion chamber, effectively improves the flammability of low volatile low-grade coal in burner hearth.Because living beings volatile matter content is tall and big in 70%, only have part volatile matter to burn in precombustion chamber, remaining volatile matter also sprays into burner hearth with coal dust, further can promote the flammability of low volatile low-grade coal.Because the oxygen in the First air of pulverized coal conveying and living beings is almost totally consumed in precombustion chamber, therefore coal dust intermixture is sent in the mist of burner hearth oxygenous hardly, be beneficial to and organize coal dust high-temperature and low-oxygen combustion in burner hearth, reduce NO further
xthe discharge of pollutant.
The present invention is by ignition system (high-energy ignition apparatus, propeller, oil gun or ignition air gun), the formation such as core pipe, living beings First air sleeve, precombustion chamber Secondary Air sleeve, coal dust First air sleeve, inside and outside Pulverized Coal Concentration ring, interior external tooth form flame holder, infra red flame monitoring device, precombustion chamber.The present invention can apply face-fired boiler turbulent burner, also can be applied to the DC burner of tangentially firing boiler.No matter be applied to opposed firing or tangentially firing boiler, in order to obtain good denitration efficiency, the Air compress pump λ <1.0 in primary zone, arranges burnt zone above primary zone, burns Air compress pump λ >1.0.
Above content is only and technological thought of the present invention is described; protection scope of the present invention can not be limited with this; every technological thought proposed according to the present invention, any change that technical scheme basis is done, within the protection domain all falling into claims of the present invention.
Claims (9)
1. the low NO of living beings low temperature pre-burning low volatile low-grade coal
xburner, comprise at least one boiler secondary air entrance (22), it is characterized in that: boiler secondary air entrance (22) is connected with the precombustion chamber (15) surrounded by precombustion chamber inner housing (14), the upper cover of precombustion chamber inner housing (14) has the precombustion chamber shell body (13) of bottom opening; The porch of precombustion chamber (15) is set with central tube (4), living beings First air sleeve (5), precombustion chamber Secondary Air sleeve (7) and coal dust First air sleeve (8) from the inside to the outside successively; Ignition system is stretched into by the end of central tube (4); Precombustion chamber (15) is also provided with for Real-Time Monitoring burning in flame status infra red flame checkout gear (11) and peep fiery device (12);
The side opening of living beings First air sleeve (5) is provided with living beings First air entrance (21), the side opening of precombustion chamber Secondary Air sleeve (7) is provided with precombustion chamber Secondary Air entrance (6), and the side opening of coal dust First air sleeve (8) is provided with coal dust First air entrance (20); The mixture of biomass fuel and air is sent into by living beings First air entrance (21), and flows in circular passage between living beings First air sleeve (5) and core pipe (4); Flow in the circular passage of precombustion chamber Secondary Air between precombustion chamber Secondary Air sleeve (7) and living beings First air sleeve (5); Flow in the circular passage of coal dust between coal dust First air sleeve (8) and precombustion chamber Secondary Air sleeve (7).
2. the low NO of living beings low temperature pre-burning low volatile low-grade coal according to claim 1
xburner, it is characterized in that: described ignition system comprises fuel delivery means (2) and is arranged on the igniter (1) of fuel delivery means (2) below, the rear end of fuel delivery means (2) and igniter (1) is connected with and seesaws in central tube (4) for carrying fuel conveying device (2) and igniter (1), to extend the propeller (3) in fuel delivery means (2) and igniter (1) service life.
3. the low NO of living beings low temperature pre-burning low volatile low-grade coal according to claim 2
xburner, is characterized in that: described fuel delivery means (2) adopts oil gun or gas ignition rifle.
4. the low NO of living beings low temperature pre-burning low volatile low-grade coal according to claim 1 and 2
xburner, is characterized in that: described living beings First air sleeve (5) front end exit place is provided with internal tooth form flame holder (17) for improving biomass fuel combustion stability and external tooth form flame holder (16); Wherein, internal tooth form flame holder (17) is arranged at the inner side of living beings First air sleeve (5) front end exit, and external tooth form flame holder (16) is arranged at the outside of living beings First air sleeve (5) front end exit.
5. the low NO of living beings low temperature pre-burning low volatile low-grade coal according to claim 1 and 2
xburner, is characterized in that: the outlet of described precombustion chamber Secondary Air sleeve (7) is provided with precombustion chamber Secondary Air enlarging (18), and precombustion chamber Secondary Air enlarging (18) front end has expanded outwardly angle.
6. the low NO of living beings low temperature pre-burning low volatile low-grade coal according to claim 1 and 2
xburner, is characterized in that: the middle part inwall of described coal dust First air sleeve (8) is provided with the outer Pulverized Coal Concentration ring (9) coal dust being separated into interior light outer dense type air-flow; The front end exit place of precombustion chamber Secondary Air sleeve (7) is set with coal powder light-dark separator tube (10), precombustion chamber Secondary Air sleeve (7) outer wall is provided with coal dust is separated into Pulverized Coal Concentration ring (19) in outer light interior dense type air-flow, interior Pulverized Coal Concentration ring (19) is positioned at coal powder light-dark separator tube (10); The air-flow that outer Pulverized Coal Concentration ring (9) and coal powder light-dark separator tube (10) are dense centered by being divided by the coal dust spraying into preheating chamber (15), both sides are light.
7. the low NO of living beings low temperature pre-burning low volatile low-grade coal according to claim 1 and 2
xburner, is characterized in that: described precombustion chamber inner housing (14) adopts the heat-resisting steel material reducing precombustion chamber (15) radiation loss.
8. the low NO of living beings low temperature pre-burning low volatile low-grade coal according to claim 1 and 2
xburner, is characterized in that: be filled with aluminosilicate refractory fiber between described precombustion chamber inner housing (14) and precombustion chamber shell body (13).
9. the low NO of living beings low temperature pre-burning low volatile low-grade coal according to claim 1 and 2
xburner, it is characterized in that: the top of the Secondary Air entrance (22) of described boiler arranges burnout degree entrance (23), in the boiler of Secondary Air entrance (22) and burnout degree entrance (23) correspondence, form territory, primary zone and after-flame region; After-flame region is positioned at the top in combustion-supporting region.
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| CN201410554792.7A CN104315502B (en) | 2014-10-17 | 2014-10-17 | A kind of biomass low temperature pre-burning low volatile low-grade coal low NOx combustion apparatus |
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| CN201410554792.7A CN104315502B (en) | 2014-10-17 | 2014-10-17 | A kind of biomass low temperature pre-burning low volatile low-grade coal low NOx combustion apparatus |
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| CN104315502B CN104315502B (en) | 2016-06-08 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107504480A (en) * | 2017-09-21 | 2017-12-22 | 哈尔滨工业大学 | A kind of industrial coal powder boiler with center feeding rotational flow coal dust burner |
| CN108397774A (en) * | 2018-05-10 | 2018-08-14 | 西安交通大学 | It is a kind of to be used for natural gas and the coal dust individually burner of burning or multifuel combustion |
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| CN113048472A (en) * | 2021-04-13 | 2021-06-29 | 山西文龙中美环能科技股份有限公司 | Gas-oil common ignition pulverized coal combustion stabilizer and combustion stabilizing method for peak regulation of coal-fired boiler |
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