CN104315502B - A kind of biomass low temperature pre-burning low volatile low-grade coal low NOx combustion apparatus - Google Patents
A kind of biomass low temperature pre-burning low volatile low-grade coal low NOx combustion apparatus Download PDFInfo
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Abstract
The invention discloses a kind of biomass low temperature pre-burning low volatile low-grade coal low NOx combustion apparatus, this burner uses biomass to replace expensive high-quality fuel gas to act as simmering fuel, biomass are at combustion chamber divided combustion, there is provided heat for combustor, make the temperature of burning maintain about 800 DEG C. Biomass generation pyrolysis at such a temperature, pyrogenous origin volatile matter partial combustion, part enters burner hearth with coal dust, then burns again. Low volatile low-grade coal is heated between 650��800 DEG C in precombustion chamber, improves the low volatile low-grade coal stability at stove chamber inner combustion. The present invention can reduce CO2��NOxDischarge, for slowing down global warming that greenhouse effect causes and reducing acid rain, photochemical fog and haze and contribute. Finally, the present invention can improve the combustibility of low volatile low-grade coal, improves efficiency of combustion, and can increase economic efficiency for enterprise and save the energy contributes.
Description
Technical field
The invention belongs to Thermal Energy and Power Engineering technical field, relate to a kind of burner, be specifically related to a kind of biomass low temperature pre-burning low NO of low volatile low-grade coalxBurner.
Background technology
Biomass energy is a kind of regenerative resource. Having a very wide distribution, yield is big, it is estimated the biomass dry weight of annual growth up to 140,000,000,000��180,000,000,000 tons. But at present as the 1% of the biomass deficiency total amount of the energy, therefore the application potential of biomass is very huge. Although biomass also generate CO in combustion2, but absorbed substantial amounts of CO in its generation process2, biomass burning is for whole atmospheric CO2Increase do not contribute, and applying biological matter replace Fossil fuel can effectively reduce CO2Discharge.
The country that China is is main energy sources with coal, 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 dry ash free basis volatile matter coal less than 20% is low-volatite coal. According to statistics, the low volatile such as anthracite, meager coal low-grade coal accounts for what China thermal coal consumed 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 be continuously increased. The general ignition difficulties of boiler of current low volatile low-grade coal, NOxDischarge high feature.
NOxIt is one of arch-criminal causing extensive haze in recent years, NO in additionxAlso can bring out the series of environmental problems such as photochemical fog, acid rain, and coal-burning boiler is China NOxOne of main source of discharge, through effort dust for many years and SOxPollution control achieves very big effect, but NOxEmission control is also relatively backward. According to the latest data of Chinese Ministry of Environmental Protection, the annual discharged nitrous oxides total amount 2337.8 ten thousand tons in the whole nation in 2012, thermoelectricity discharge accounts for 35%��40%, brings serious threat to our environment.Therefore country has formulated increasingly stricter controlling measurement NOxDischarge. Up-to-date " fossil-fuel power plant atmospheric pollutant emission standard GB13223-2011 " NOxDischarge standard is all stricter than America and Europe, the NO of coal-burning boilerxDischarge capacity is less than 100mg/m3��
The pre-combustion technology of coal dust low temperature is the low NO grown up in recent yearsxCombustion technology, coal dust first flows into the reducing atmosphere combustor of a gas heating before entering burner, and in combustor, coal dust, about rapidly pre-warming to 800 DEG C, is discharged the volatile matter of a large amount of nitrogenate partial combustion, provides major heat for combustor. Under this reducing atmosphere, nitrogen oxides is reduced into N2, effectively reduce NOxDischarge. Additionally due to coal dust is before entering hearth combustion, it is preheating to higher temperature, it is possible to the problem solving low volatile low-grade coal ignition difficulties.
Owing to biomass have volatile matter height, carbon activity is high, it is easy to ablaze feature. Biomass are used to replace the expensive gaseous fuel of high-quality that low volatilization low-grade coal is preheated, more economical. Simultaneously because a large amount of volatile matters of biomass release can generate in the precombustion chamber of low-oxygen environment and have NO in a large numberxThe soot (soot) of reducing power, before entering hearth combustion, these soot uniformly mix with the coal dust being preheated. Burn by reasonably organizing in stove, the NO that these soot can be effectively newly-generated in reduction furnacex, reduce NOxThe purpose of discharge.
Summary of the invention
It is an object of the invention to provide a kind of for improving low volatile low-grade coal coal dust firing stability and reducing NOxThe biomass low temperature pre-burning low NO of low volatile low-grade coal of dischargexBurner, coal dust intermixture is sent in the mixing gas of burner hearth and is practically free of oxygen by this burner, is beneficial to tissue coal dust high-temperature and low-oxygen combustion in burner hearth, reduces NO furtherxThe discharge of pollutant.
For reaching above-mentioned purpose, the technical solution used in the present invention is:
A kind of biomass low temperature pre-burning low volatile low-grade coal low NOx combustion apparatus, including at least one boiler secondary air entrance, boiler secondary air entrance is connected to the precombustion chamber surrounded by precombustion chamber inner housing, precombustion chamber inner housing is cased with the precombustion chamber shell body of bottom opening; The porch of precombustion chamber is set with central canal, biomass First air sleeve, precombustion chamber secondary wind sleeve and coal dust First air sleeve from the inside to the outside successively; Ignition system is stretched into by the end of central canal; Precombustion chamber is also equipped with the infra red flame detecting device for monitoring the flame status in burning in real time and peeps fire device;
The side opening of biomass First air sleeve is provided with biomass First air entrance, and the side opening of precombustion chamber secondary wind sleeve is provided with precombustion chamber secondary wind 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 biomass First air entrance, and flows in the circular passage between biomass First air sleeve and core pipe; Flow in precombustion chamber secondary wind circular passage between precombustion chamber secondary wind sleeve and biomass First air sleeve; Flow in coal dust circular passage between coal dust First air sleeve and precombustion chamber secondary wind sleeve.
Described ignition system includes fuel delivery means and is arranged on the igniter below fuel delivery means, the rear end of fuel delivery means and igniter is connected to and seesaws in central canal for carrying fuel conveyer 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 biomass First air barrel forward end exit is provided with the 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 biomass First air barrel forward end outlet, and external tooth form flame holder is arranged at the outside of biomass First air barrel forward end outlet.
The outlet of described precombustion chamber secondary wind sleeve is provided with precombustion chamber secondary wind enlarging, and precombustion chamber secondary wind enlarging front end expands outwardly angled.
The middle part inwall of described coal dust First air sleeve is provided with the outer Pulverized Coal Concentration ring that coal dust is separated into interior light outer dense type air-flow; The front end exit place of precombustion chamber secondary wind sleeve is set with coal powder light-dark and separates pipe, and precombustion chamber secondary wind sleeve outer wall is provided with the interior Pulverized Coal Concentration ring that coal dust is separated into outer light interior dense type air-flow, and interior Pulverized Coal Concentration ring is positioned at coal powder light-dark separation pipe; Outer Pulverized Coal Concentration ring separates pipe and the coal dust spraying into preheating chamber is divided into the air-flow that center is dense, both sides are light with coal powder light-dark.
Described precombustion chamber inner housing adopts the heat-resisting steel material reducing precombustion chamber radiation loss.
It is filled with aluminosilicate refractory fiber between described precombustion chamber inner housing and precombustion chamber shell body.
The secondary wind entrance of described boiler be provided above burnout degree entrance, form territory, primary zone and after-flame region in the secondary wind entrance boiler corresponding with burnout degree entrance; After-flame region is positioned at the top in combustion-supporting region.
Compared with prior art, the method have the advantages that
The present invention uses biomass to replace expensive high-quality fuel gas to act as simmering fuel, and biomass, at combustion chamber divided combustion, provide heat for combustor, make the temperature of burning maintain about 800 DEG C. Biomass generation pyrolysis at such a temperature, pyrogenous origin volatile matter partial combustion, part enters burner hearth with coal dust, then burns again. Low volatile low-grade coal is heated between 650��800 DEG C in precombustion chamber, improves the low volatile low-grade coal stability at stove chamber inner combustion. Structurally, the present invention installs precombustion chamber on boiler secondary air entrance, and is set with central canal, biomass First air sleeve, precombustion chamber secondary wind sleeve and coal dust First air sleeve from the inside to the outside successively in the porch of precombustion chamber; Precombustion chamber secondary wind is arranged between breeze airflow and biomass air-flow, improves the stability of biomass fuel combustion so that biomass fuel is the burning of anaerobic environment lower part in precombustion chamber, generate and there is NO in a large numberxThe soot (soot) of reduction characteristic, these soot particulates (soot) enter hearth combustion before even dispersion between pulverized coal particle, burning by reasonably organizing in stove, these soot (soot) can effectively be reduced coal dust and be burnt in stove newly-generated NOxPollutant. The present invention can reduce CO2��NOxDischarge, for slowing down global warming that greenhouse effect causes and reducing acid rain, photochemical fog and haze and contribute. Finally, the present invention can improve the combustibility of low volatile low-grade coal, improves efficiency of combustion, and can increase economic efficiency for enterprise and save the energy contributes.
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 ignition location delivered to by high-energy igniter.After igniting terminates, propeller runs backward, and oil gun and high-energy igniter are shunk back central canal, it is to avoid high temperature washes away, corrodes and coking pollution. Extend oil gun or the service life of 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 wind export expansion certain angle, and interior Pulverized Coal Concentration ring, outer Pulverized Coal Concentration ring and coal powder light-dark are set in the circular passage that breeze airflow flows through and separate pipe, further increase the stability of biomass fuel combustion; Meanwhile, interior Pulverized Coal Concentration ring, outer Pulverized Coal Concentration ring and coal powder light-dark separation pipe make coal dust be divided into center dense after spraying 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 the 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 biomass First air sleeves; 6 is precombustion chamber secondary wind entrance; 7 is precombustion chamber secondary wind sleeve; 8 is coal dust First air sleeve; 9 is outer Pulverized Coal Concentration ring; 10 separate pipe for coal powder light-dark; 11 monitor device for infra red flame; 12 for peeping fire 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 precombustion chamber secondary wind enlarging; 19 is interior Pulverized Coal Concentration ring; 20 is coal dust First air entrance; 21 is biomass First air entrances; 22 is secondary wind 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:
Referring to Fig. 1 to Fig. 3, the present invention includes at least one boiler secondary air entrance 22, boiler secondary air entrance 22 is connected to the precombustion chamber 15 surrounded by precombustion chamber inner housing 14, the secondary wind entrance 22 of boiler be provided above burnout degree entrance 23, form territory, primary zone and after-flame region in the boiler of secondary wind entrance 22 and burnout degree entrance 23 correspondence; After-flame region is positioned at the top in combustion-supporting region. Precombustion chamber inner housing 14 is cased with 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. It is filled with aluminosilicate refractory fiber between precombustion chamber inner housing 14 and precombustion chamber shell body 13. Precombustion chamber 15 it is also equipped with for infra red flame detecting device 11 and peeps fire device 12. The porch of precombustion chamber 15 is set with central canal 4, biomass First air sleeve 5, precombustion chamber secondary wind 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 canal 4; Ignition system includes 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 to and seesaws in central canal 4 for carrying fuel conveyer 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 biomass First air sleeve 5 is provided with biomass First air entrance 21, and biomass First air sleeve 5 front end exit place is provided with the 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 biomass First air sleeve 5 front end exit, and external tooth form flame holder 16 is arranged at the outside of biomass First air sleeve 5 front end exit. The side opening of precombustion chamber secondary wind sleeve 7 is provided with precombustion chamber secondary wind entrance 6, and the outlet of precombustion chamber secondary wind sleeve 7 is provided with precombustion chamber secondary wind enlarging 18, and precombustion chamber secondary wind enlarging 18 front end expands outwardly angled. 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 that coal dust is separated into interior light outer dense type air-flow; The front end exit place of precombustion chamber secondary wind sleeve 7 is set with coal powder light-dark separation pipe 10, being provided with the interior Pulverized Coal Concentration ring 19 that coal dust is separated into outer light interior dense type air-flow on precombustion chamber secondary wind sleeve 7 outer wall, interior Pulverized Coal Concentration ring 19 is positioned at coal powder light-dark separation pipe 10; Outer Pulverized Coal Concentration ring 9 separates pipe 10 and the coal dust spraying into preheating chamber 15 is divided into the air-flow that center is dense, both sides are light with coal powder light-dark. The mixture of biomass fuel and air is sent into by biomass First air entrance 21, and flows in the circular passage between biomass First air sleeve 5 and core pipe 4; Flow in precombustion chamber secondary wind circular passage between precombustion chamber secondary wind sleeve 7 and biomass First air sleeve 5; Flow in coal dust circular passage between coal dust First air sleeve 8 and precombustion chamber secondary wind sleeve 7.
Principles of the invention:
The present invention uses biomass to replace expensive high-quality fuel gas to act as simmering fuel, and biomass, at combustion chamber divided combustion, provide heat for combustor, make the temperature of burning maintain about 800 DEG C. Biomass generation pyrolysis at such a temperature, pyrogenous origin volatile matter partial combustion, part enters burner hearth with coal dust, then burns again. Low volatile low-grade coal is heated between 650��800 DEG C in precombustion chamber, improves the low volatile low-grade coal stability at stove chamber inner combustion.
Definition biomass input quality percentage ratio is s%, and biomass As-received volatile matter content isThe As-received volatile matter content of low volatile low-grade coal isIn order to obtain good denitration efficiency, then require:In order to ensure the low-oxygen environment in precombustion chamber, it is desirable to:
That is total in preheating chamber excess air coefficient �� is less than 0.2.
Biomass in precombustion chamber under anaerobic environment pyrolysis and combustion �� < 0.2, substantial amounts of soot soot can generate under this anoxycausis environment and preserve. These soot particulates soot enters even dispersion before hearth combustion and, between pulverized coal particle, burns by reasonably organizing in stove, and these soot soot can effectively reduce coal dust and burn in stove newly-generated NOxPollutant. Due to Air compress pump �� < 0.2 in precombustion chamber, the oxygen in preheating chamber is almost run out by biomass combustion. Therefore pulverized coal conveying, soot, unburned volatilization grade and are practically free of oxygen in the mixing gas entering burner hearth, are beneficial to tissue coal dust high-temperature and low-oxygen combustion in burner hearth, reduce NO furtherxThe discharge of pollutant.
The present invention can apply face-fired boiler turbulent burner, it is also possible to is applied to the DC burner of tangentially firing boiler. No matter it is applied to opposed firing or tangentially firing boiler, in order to obtain good denitration efficiency, the Air compress pump ��<1.0 in primary zone, it is provided above burnt zone in primary zone, burns Air compress pump ��>1.0.
In order to improve the regulator of the gentle monitoring burning of Automated water, the present invention monitors device equipped with high energy ignition unit, oil gun or gas ignition rifle and infra red flame. In order to extend the service life of oil gun and high energy ignition unit, it is 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 canal, it is to avoid high temperature washes away, corrodes and coking pollution.
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 wind is set between breeze airflow and biomass air-flow; Secondly, precombustion chamber secondary wind export expansion has certain angle; Finally, arranging interior Pulverized Coal Concentration ring, when breeze airflow clashes into interior concentration ring, 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 clashes into interior concentration ring, due to effect of inertia, coal dust is separated into outer light interior dense type air-flow. Separate pipe with coal powder light-dark owing to arranging inside and outside Pulverized Coal Concentration ring, then coal dust sprays into centered by after preheating chamber dense, the air-flow that both sides are light. Owing to 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 work process of the present invention:
First, precombustion chamber secondary wind is sent into by precombustion chamber secondary wind entrance 6, flow in precombustion chamber secondary wind circular passage between precombustion chamber secondary wind sleeve 7 and biomass First air sleeve 5, and enter 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. Precombustion chamber secondary wind is sent into by precombustion chamber secondary wind entrance 6, flows in precombustion chamber secondary wind circular passage between precombustion chamber secondary wind sleeve 7 and biomass First air sleeve 5, and enter in precombustion chamber 15.
Sent into the mixture of biomass fuel and air by biomass First air entrance 21, flow in this mixture circular passage between biomass First air sleeve 5 and core pipe 4, enter after precombustion chamber until it, calorific value the flame ignition formed by oil gun 2 occur. Interior external tooth form flame holder 16,17 and precombustion chamber secondary wind 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, flow in coal dust circular passage between coal dust First air sleeve 8 and precombustion chamber secondary wind sleeve 7, due to about inertia, it is separated into, separating pipe 10 with outer Pulverized Coal Concentration ring 9 with coal powder light-dark by interior Pulverized Coal Concentration ring 19, the breeze airflow that center is dense, two-layer is light.
Breeze airflow is preheating to 650 DEG C��800 DEG C after entering combustor. What biomass pyrolytic was formed has NOxA large amount of soot of reduction characteristic, due in preheating chamber 15 Air compress pump less than 0.2, oxygen wretched insufficiency, preserved. Imperfect combustion pyrolysis gas of biomass, there is NOxA large amount of soot soot of reduction characteristic and the granuloplastic mixture of low volatile pulverized coal being preheated, at the second half section Homogeneous phase mixing of precombustion chamber, be then fed into hearth combustion.
After precombustion chamber flameholding, propeller 3 action, by oil gun or gas ignition rifle and high energy ignition unit retraction central canal 2, to extend its service life.Simultaneously infra red flame monitoring device 11 monitor the flame status in burning in real time by peeping fire device 12, when there is fire extinguishing, sends alarm, and stops the input of biomass fuel and coal dust in time, re-executes and purges and ignition operation.
Imperfect combustion pyrolysis gas of biomass, there is NOxA large amount of soot (soot) of reduction characteristic and the granuloplastic mixture of low volatile pulverized coal being preheated, after sending into hearth combustion. Extend the soot (soot) time of staying in burner hearth as much as possible, play its denitration ability, because the oxidation rate that soot (soot) is under high oxygen concentration reduces NO far above itxSpeed. Therefore by regulating the ratio of secondary wind 22 and burnout degree 23, make the Air compress pump ��<1.0 in primary zone, the Air compress pump ��>1.0 of burning-out zone.
It also have the advantage that
The present invention provides that a set of combustion stability is good, NOxDischarge low biomass low temperature pre-burning low volatile low-grade coal burner. This burner adopts biomass to provide heat for low temperature precombustion chamber, and biomass are the burning of anaerobic environment lower part in precombustion chamber, generates and has NO in a large numberxThe soot (soot) of reduction characteristic, these soot particulates (soot) enter hearth combustion before even dispersion between pulverized coal particle, burning by reasonably organizing in stove, these soot (soot) can effectively be reduced coal dust and be burnt in stove newly-generated NOxPollutant. Low volatile low-grade coal is preheating between 650��800 DEG C in precombustion chamber, effectively improves low volatile low-grade coal flammability in burner hearth. Owing to biomass volatile matter content is tall and big in 70%, only having part volatile matter and burn in precombustion chamber, remaining volatile matter also sprays into burner hearth with coal dust, it is possible to further promote the flammability of low volatile low-grade coal. Owing to the oxygen in the First air of pulverized coal conveying and biomass is almost totally consumed in precombustion chamber, therefore coal dust intermixture is sent in the mixing gas of burner hearth and be practically free of oxygen, be beneficial to tissue coal dust high-temperature and low-oxygen combustion in burner hearth, reduce NO furtherxThe discharge of pollutant.
The present invention is by ignition system (high-energy igniter device, propeller, oil gun or ignition air gun), core pipe, biomass First air sleeve, precombustion chamber secondary wind 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 etc. constitute. The present invention can apply face-fired boiler turbulent burner, it is also possible to is applied to the DC burner of tangentially firing boiler. No matter it is applied to opposed firing or tangentially firing boiler, in order to obtain good denitration efficiency, the Air compress pump ��<1.0 in primary zone, it is provided above burnt zone in primary zone, burns Air compress pump ��>1.0.
Above content is only the technological thought that 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 done on technical scheme basis, each fall within the protection domain of claims of the present invention.
Claims (8)
1. the biomass low temperature pre-burning low NO of low volatile low-grade coalxBurner, including at least one boiler secondary air entrance (22), it is characterized in that: boiler secondary air entrance (22) is connected to the precombustion chamber (15) surrounded by precombustion chamber inner housing (14), precombustion chamber inner housing (14) is cased with the precombustion chamber shell body (13) of bottom opening; The porch of precombustion chamber (15) is set with central canal (4), biomass First air sleeve (5), precombustion chamber secondary wind 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 canal (4); Precombustion chamber (15) is also equipped with the infra red flame detecting device (11) for monitoring the flame status in burning in real time and peeps fire device (12);
The side opening of biomass First air sleeve (5) is provided with biomass First air entrance (21), the side opening of precombustion chamber secondary wind sleeve (7) is provided with precombustion chamber secondary wind 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 biomass First air entrance (21), and flows in the circular passage between biomass First air sleeve (5) and core pipe (4); Flow in precombustion chamber secondary wind circular passage between precombustion chamber secondary wind sleeve (7) and biomass First air sleeve (5); Flow in coal dust circular passage between coal dust First air sleeve (8) and precombustion chamber secondary wind sleeve (7);
Described biomass First air sleeve (5) front end exit place is provided with the 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 biomass First air sleeve (5) front end exit, and external tooth form flame holder (16) is arranged at the outside of biomass First air sleeve (5) front end exit.
2. the biomass low temperature pre-burning low NO of low volatile low-grade coal according to claim 1xBurner, it is characterized in that: described ignition system includes fuel delivery means (2) and is arranged on the igniter (1) of fuel delivery means (2) lower section, the rear end of fuel delivery means (2) and igniter (1) is connected to and seesaws in central canal (4) for carrying fuel conveyer device (2) and igniter (1), to extend the propeller (3) in fuel delivery means (2) and igniter (1) service life.
3. the biomass low temperature pre-burning low NO of low volatile low-grade coal according to claim 2xBurner, it is characterised in that: described fuel delivery means (2) adopts oil gun or gas ignition rifle.
4. the biomass low temperature pre-burning low NO of low volatile low-grade coal according to claim 1 and 2xBurner, it is characterised in that: the outlet of described precombustion chamber secondary wind sleeve (7) is provided with precombustion chamber secondary wind enlarging (18), and precombustion chamber secondary wind enlarging (18) front end expands outwardly angled.
5. the biomass low temperature pre-burning low NO of low volatile low-grade coal according to claim 1 and 2xBurner, it is characterised in that: the middle part inwall of described coal dust First air sleeve (8) is provided with the outer Pulverized Coal Concentration ring (9) that coal dust is separated into interior light outer dense type air-flow; The front end exit place of precombustion chamber secondary wind sleeve (7) is set with coal powder light-dark and separates pipe (10), being provided with the interior Pulverized Coal Concentration ring (19) that coal dust is separated into outer light interior dense type air-flow on precombustion chamber secondary wind sleeve (7) outer wall, interior Pulverized Coal Concentration ring (19) is positioned at coal powder light-dark and separates pipe (10); Outer Pulverized Coal Concentration ring (9) separates pipe (10) and the coal dust spraying into preheating chamber (15) is divided into the air-flow that center is dense, both sides are light with coal powder light-dark.
6. the biomass low temperature pre-burning low NO of low volatile low-grade coal according to claim 1 and 2xBurner, it is characterised in that: described precombustion chamber inner housing (14) adopts the heat-resisting steel material reducing precombustion chamber (15) radiation loss.
7. the biomass low temperature pre-burning low NO of low volatile low-grade coal according to claim 1 and 2xBurner, it is characterised in that: it is filled with aluminosilicate refractory fiber between described precombustion chamber inner housing (14) and precombustion chamber shell body (13).
8. the biomass low temperature pre-burning low NO of low volatile low-grade coal according to claim 1 and 2xBurner, it is characterized in that: the secondary wind entrance (22) of described boiler be provided above burnout degree entrance (23), secondary wind entrance (22) and form territory, primary zone and after-flame region in boiler corresponding to burnout degree entrance (23); 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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| CN105972588B (en) * | 2016-07-14 | 2018-08-10 | 西安交通大学 | A kind of low NO of pumping high-temperature flue gas preheating typexBurner |
| CN107355776B (en) * | 2017-07-13 | 2019-06-18 | 武汉华喻燃能工程技术有限公司 | Combustion System of Boiler Burning Fine, method and the application of ultra-low NOx emission |
| 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 |
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| CN204187609U (en) * | 2014-10-17 | 2015-03-04 | 西安交通大学 | The low NO of a kind of living beings low temperature pre-burning low volatile low-grade coal xburner |
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