CN206130963U - Low NOx combustor of high temperature flue gas backward flow pre -burning formula with SOFA - Google Patents

Low NOx combustor of high temperature flue gas backward flow pre -burning formula with SOFA Download PDF

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Publication number
CN206130963U
CN206130963U CN201621103794.5U CN201621103794U CN206130963U CN 206130963 U CN206130963 U CN 206130963U CN 201621103794 U CN201621103794 U CN 201621103794U CN 206130963 U CN206130963 U CN 206130963U
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China
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air
direct current
sofa
precombustion chamber
eddy flow
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CN201621103794.5U
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Chinese (zh)
Inventor
惠世恩
张晓璐
吕媛
雷雨
柳晟
王帅
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Xian Jiaotong University
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Xian Jiaotong University
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Abstract

The utility model discloses a low NOx combustor of high temperature flue gas backward flow pre -burning formula with SOFA, including the antechamber, the entry of antechamber one side sets up the SMIS pipe, is provided with an outer overgrate air and a SOFA air guide sleeve section of thick bamboo in the antechamber, has seted up a plurality of outer overgrate air spouts on the lateral wall of antechamber, and the antechamber casing outside sets up a plurality of SOFA wind direct current spouts, the entry of a secondary air guide sleeve section of thick bamboo is linked together with the interior secondary air channel of whirl in the whirl, and the export is linked together with the antechamber. The utility model discloses a buggy low temperature pre -burning technique is carried the buggy through a wind and is got into the antechamber, carries out pre -burning under antechamber reducing atmosphere. Interior overgrate air passes through the flap valve and falls into two strands, mainly plays disturbance and immixture, can also form different interior overgrate air whirl intensity through the aperture of adjusting interior secondary air regulation valve of whirl and the interior secondary air regulation valve of direct current. The utility model discloses can effectively reduce NOx's emission, simultaneously flame stability is good, makes the contribution for thermoelectricity enterprise reduces the NOx pollutant emission.

Description

It is provided with the high temperature gases recirculating preheating type low-NOx combustor of SOFA
【Technical field】
This utility model belongs to Thermal Energy and Power Engineering technical field, is related to a kind of high temperature gases recirculating for being provided with SOFA pre- Combustion low-NOx combustor.
【Background technology】
NOxIt is to cause one of arch-criminal of extensive haze in recent years, NO in additionxPhotochemical fog, acid rain etc. one can also be induced Serial environmental problem, and coal-burning boiler is China NOxOne of main source of discharge, through effort dust for many years and SOx pollution controls achieve very big effect, but NOxEmission control also falls behind relatively.According to the latest data of Chinese Ministry of Environmental Protection, 2337.8 ten thousand tons of whole nation whole year discharged nitrous oxides total amount in 2012, thermoelectricity discharge accounts for 35%~40%, to our environment Bring serious threat.Therefore country has formulated increasingly stricter controlling measurement NOxDischarge.Newest《Thermal power plant's air Pollutant emission standard GB13223-2011》NOxDischarge standard is all stricter than American-European, the NO of coal-burning boilerxDischarge capacity is less than 100mg/m3
At present the control method of nitrogen oxides mainly has denitrating flue gas and the big class of combustion denitration two.At present conventional flue gas takes off Nitre method mainly includes selective catalytic reduction and SNCR method.Combustion denitration technology is then fired including low NOx The methods such as burner, Researched of Air Staging Combustion Burning Pulverized Coal and flue gas recirculation.Coal powder burner is the capital equipment of thermoelectricity production, therefore, such as What improves the stability of coal dust firing, while the discharge for reducing NOx is the emphasis of coal powder burner research.Coal dust low temperature pre-burning Technology is the low NOx combusting technology for growing up in recent years, and coal dust is entered before burner, first flows into the pre- of reducing atmosphere Combustion room.Due to hot conditionss in pre-burning room, directly in pre-burning Indoor Combustion, the nitrogen in fuel has the coal dust carried in First air Machine compound is heated and be pyrolyzed first as Blausure (German) (HCN), ammonia (NH3) and the intermediate product such as CN.Due to oxygen in pre-burning room air Gas content is very limited, oxygen preferentially with intermediate product (HCN, NH3And CN) reaction generation H2O、N2And CO2, reduce combustion air Oxygen concentration reduce the generation of nitrogen oxides simultaneously.In addition staged air distribution placement technique, makes the oxygen entered in the gaseous mixture of burner hearth Gas ratio is little, it is ensured that coal dust burns in low-oxygen environment, reduce flame temperature, not only can reduce fuel type NOx generate and The generation of thermal NO x can be reduced, reducing atmosphere is being partially formed, the discharge of NOx is effectively reduced.Burner secondary wind rotates Jet is mixed with great role to the disturbance of air-flow and coal dust, can stably burn, and the backflow that rotating jet is formed Area is on the one hand from recirculating zone backflow high-temperature flue gas;Another aspect rotating jet also inhales high ambient temperatures cigarette from the external boundary volume of jet Gas, so as to improve the stability of coal powder ignition, burning, by high-speed jet volume a large amount of flue gases is inhaled, and makes coal dust in low-oxygen environment Burning, reduces peak flame temperature, reduces thermal NO x and generates.Separated by First air coal powder light-dark and steady flame tooth also has Help reduce NOx generation amount and raising combustion stability.
SOFA wind is the abbreviation of remote burnout degree (Separated Over Fire Air), is the main combustion of distance in burner hearth There is the burnout degree of certain distance in area.Because in order to reduce the generation of NOx, general main burning area is to be under micro- anaerobic environment (i.e. Reducing atmosphere) burning, excess air coefficient is less than 1, so combustible (C, CO etc.) can not be completely burned off, therefore Needs configuration SOFA wind where main burning area certain distance in burner hearth, so that combustible is in later stage further after-flame, And it is because distant when uncombusted flue gas is reached herein, temperature decreases can also suppress the generation of NOx.This practicality It is new that SOFA wind is introduced into the low-NOx combustor so that the burner by staged air distribution, rotating jet and coal powder pre-burning come Can make combustible in later stage further after-flame while reducing NOx emission, stably burn, reduce flying dust and further reduce NOx。
【Utility model content】
The purpose of this utility model is the shortcoming for overcoming above-mentioned prior art, there is provided a kind of high-temperature flue gas for being provided with SOFA Backflow preheating type low-NOx combustor.
To reach above-mentioned purpose, this utility model is employed the following technical solutions and is achieved:
The high temperature gases recirculating preheating type low-NOx combustor of SOFA, including precombustion chamber are provided with, the inlet side of precombustion chamber sets Core pipe is put, First air sleeve, direct current inner second air sleeve and eddy flow inner second air sleeve is arranged with outside core pipe successively;Oil Rifle and high energy ignition unit are stretched into by the end of core pipe, and are extend out in pre-burning room by front end;Outer two are provided with precombustion chamber Secondary wind and SOFA windband cylinders, offer some outer second air spouts on the side wall of precombustion chamber, precombustion chamber hull outside arranges some SOFA wind direct current spouts;The entrance of First air sleeve is connected with First air entrance;The entrance of direct current inner second air sleeve with it is straight Stream inner second air passage is connected, and outlet is connected with precombustion chamber;The entrance of eddy flow inner second air sleeve and eddy flow inner second air Passage is connected, and outlet is connected with precombustion chamber.
This utility model is further improved by:
The end connection combined pneumatic propeller of the oil gun and high energy ignition unit, when igniting is needed, combination type Oil gun and high energy ignition unit are delivered to ignition location by pneumatic booster, after igniting terminates, by oil gun and high energy ignition unit In shrinking back core pipe.
The end of the core pipe arranges first and peeps fiery device, and infra red flame detection means is arranged on precombustion chamber rear end side wall Fiery device is peeped with second.
The exit of the First air sleeve is provided for the Pulverized Coal Concentration ring and steady flame of the stability for improving coal dust firing Tooth.
The entrance of the direct current inner second air passage and eddy flow inner second air passage is provided for adjusting direct current inner second air With the flap valve of the air intake ratio of eddy flow inner second air;The exit of eddy flow inner second air passage arranges tangential swirl blade.
Direct current inner second air regulating valve and eddy flow inner second air regulating valve are provided with the flap valve, by adjusting direct current The aperture of inner second air regulating valve and eddy flow inner second air regulating valve, adjusts the ratio of direct current inner second air and eddy flow inner second air Example.
The outlet of the direct current inner second air sleeve expands outwardly angle [alpha], 20 °≤α≤30 °.
The inwall of precombustion chamber inlet side and the angle of horizontal direction are β, 25 °≤β≤35 °.
The axially position angle of the outer second air spout be γ, 25 °≤γ≤35 °, circumferentially positioned angle be θ, 25 °≤θ≤ 35 °, the outer second air for making ejection forms eddy flow outer second air around precombustion chamber outlet axes.
The precombustion chamber hull outside arranges 18 SOFA wind direct current spouts.
Compared with prior art, this utility model has the advantages that:
This utility model adopts the pre- combustion technology of coal dust low temperature, carries coal dust by First air and enters precombustion chamber, in precombustion chamber Pre-burning is carried out under reducing atmosphere.Nitrogen organic compound in fuel is heated and be pyrolyzed first as Blausure (German) (HCN), ammonia (NH3) and The intermediate products such as CN.Because content of oxygen in air is very limited in pre-burning room, oxygen preferentially with intermediate product (HCN, NH3With CN) reaction generates H2O、N2And CO2, reduce the oxygen concentration of combustion air reduces the generation of nitrogen oxides simultaneously.First air exit Pulverized Coal Concentration ring can realize that coal powder light-dark is separated, obtain the breeze airflow of high concentration, high concentration pulverized coal air-flow has good Catch fire and steady combustion property.Improving coal powder density can further reduce NOx generation amount.The steady flame tooth in First air exit also can rise To the effect of stable burning.In terms of air stage feeding, inner second air is divided into two strands, i.e. direct current inner second air and rotation by flap valve Stream inner second air, supplements the air required for coal dust burns away, and acts primarily as disturbance and immixture, but also can lead to Overregulate the aperture of eddy flow inner second air regulating valve and direct current inner second air regulating valve to control the ratio of two strands of inner second airs, enter And form different inner second air swirl strengths.Outer second air is sprayed by 18 tilting whirl holes, the outer second air pair of eddy flow The disturbance of air-flow and coal dust are mixed with great role, can stably burn, and the side of recirculating zone one that rotating jet is formed Face is from recirculating zone backflow high-temperature flue gas;Another aspect rotating jet also inhales high ambient temperatures flue gas from the external boundary volume of jet, so as to Coal powder ignition, the stability of burning are improved, the relatively low oxygen content of high-temperature flue gas also contributes to suppress the generation of NOx.This burning is filled Put and introduce SOFA wind, SOFA wind sprays from 18 SOFA wind direct currents spouts of precombustion chamber shell rim, makes combustible in the later stage Further after-flame, reduces flying dust and further reduces NOx.This utility model can effectively reduce the discharge of NOx, while flame is steady It is qualitative good, it is that Thermal Power Enterprises reduction NOx pollutant emissions contribute.
【Description of the drawings】
Fig. 1 is overall structure diagram of the present utility model;
Fig. 2 is the profile in Figure 1A-A directions;
Fig. 3 is the right view of Fig. 1;
Fig. 4 is the top view of Fig. 1.
Labelling in figure:1- high energy ignition units, 2- oil guns, 3- combined pneumatic propellers, 4- first peeps fiery device, in 5- Core pipe, 6- First air sleeves, 7- direct current inner second air passages, 8- eddy flow inner second air passages, 9- flap valves, 10- infra red flames Monitoring device, 11- second peeps fiery device, 12- outer second airs and SOFA wind entrances, 13- pre-burning room housings, 14- precombustion chambers, 15- Outer second air spout, 16-SOFA wind direct current spouts, the steady flame teeth of 17-, 18- direct current inner second air enlargings, 19- Pulverized Coal Concentration rings, 20- direct current inner second air sleeves, 21- eddy flow inner second air sleeves, 22- tangential swirl blades, 23- First air entrances, 24- eddy flows Inner second air regulating valve, 25- direct current inner second air regulating valves.
【Specific embodiment】
This utility model is described in further detail below in conjunction with the accompanying drawings:
Referring to Fig. 1-Fig. 4, this utility model is by ignition system (high energy ignition unit 1, oil gun 2, combined pneumatic propeller 3), core pipe 5, First air sleeve 6, steady flame tooth 17, Pulverized Coal Concentration ring 19, direct current inner second air passage 7, eddy flow inner second air lead to Road 8, direct current inner second air sleeve 20, eddy flow inner second air sleeve 21, flap valve 9, infra red flame monitoring device 10, peep fiery dress Put, pre-burning room housing, precombustion chamber 14, outer second air spout 15, SOFA wind direct currents spout 16 etc. are constituted.
This utility model includes precombustion chamber 14, and the inlet side of precombustion chamber 14 arranges core pipe 5, and core pipe 5 is outer to be covered successively It is provided with First air sleeve 6, direct current inner second air sleeve 20 and eddy flow inner second air sleeve 21;Oil gun 2 and high energy ignition unit 1 Stretched into by the end of core pipe 5, and extend out in precombustion chamber 14 by front end;Outer second air and SOFA wind are provided with precombustion chamber 14 Sleeve, offers some outer second air spouts 15 on the side wall of precombustion chamber 14, the hull outside of precombustion chamber 14 arranges some SOFA wind Direct current spout 16;The entrance of First air sleeve 6 is connected with First air entrance 23;The entrance of direct current inner second air sleeve 20 with it is straight Stream inner second air passage 7 is connected, and outlet is connected with precombustion chamber 14;Two in the entrance and eddy flow of eddy flow inner second air sleeve 21 Secondary wind passage 8 is connected, and outlet is connected with precombustion chamber 14.
The end of oil gun 2 and high energy ignition unit 1 connects combined pneumatic propeller 3, when igniting is needed, combination type gas Oil gun 2 and high energy ignition unit 1 are delivered to ignition location by dynamic propeller 3, after igniting terminates, oil gun 2 and high-energy ignition are filled Put 1 to shrink back in core pipe 5.The end of core pipe 5 arranges first and peeps fiery device 4, arranges infrared on the rear end side wall of precombustion chamber 14 Flame detecting device 10 and second peeps fiery device 11.
The exit of First air sleeve 6 is provided for the Pulverized Coal Concentration ring 19 and steady flame tooth of the stability for improving coal dust firing 17.The entrance of direct current inner second air passage 7 and eddy flow inner second air passage 8 is provided for adjusting in direct current inner second air and eddy flow The flap valve 9 of the air intake ratio of secondary wind;The exit of eddy flow inner second air passage 8 arranges tangential swirl blade 22.Flap valve 9 Direct current inner second air regulating valve 25 and eddy flow inner second air regulating valve 24 are inside provided with, by adjusting direct current inner second air regulating valve 25 and the aperture of eddy flow inner second air regulating valve 24, adjust the ratio of direct current inner second air and eddy flow inner second air.
The outlet of direct current inner second air sleeve 20 expands outwardly angle [alpha], 20 °≤α≤30 °.Precombustion chamber inlet side it is interior The angle of wall and horizontal direction is β, 25 °≤β≤35 °.The axially position angle of outer second air spout 15 be γ, 25 °≤γ≤ 35 °, circumferentially positioned angle is θ, and 25 °≤θ≤35 °, the outer second air for making ejection is collected near the outlet axes of precombustion chamber 14.Pre-burning The hull outside of room 14 arranges 18 SOFA wind direct currents spouts 16.
Principle of the present utility model:
This utility model rolls up seat and enters the high-temperature flue gas of precombustion chamber to precombustion chamber using the recirculating zone that eddy flow outer second air is formed Interior coal dust is preheated, and is on the one hand conducive to stable burning, coal dust is burnt and is pyrolyzed in pre-burning indoor section, combustion Nitrogen organic compound in material is heated pyrolysis first for the intermediate product such as Blausure (German), and generates with oxygen reaction under low oxygen conditions N2, effectively reduce the growing amount of NOx.The oxygen content of high-temperature flue gas of precombustion chamber is flowed back into than relatively low, be reduce further pre- The indoor oxygen content of combustion, it is suppressed that the generation of NOx.
In order to ensure the low-oxygen environment in pre-burning room, it is desirable to:
(primary air flow (coal dust)+inner second air amount) Theoretical Calculation total blast volume < 0.2 needed for/coal dust firing
That is preheat indoor total excess air coefficient and be less than 0.2.
Due to Air compress pump < 0.2 in pre-burning room, preheat indoor oxygen and almost run out by coal dust firing.Therefore Pulverized coal conveying, unburned volatilization grade and are practically free of oxygen in the mixed gas of burner hearth, beneficial to tissue coal dust in stove High-temperature and low-oxygen combustion in thorax, further reduces the discharge of NOx pollutant.
In order to obtain preferable denitration efficiency, the high temperature gases recirculating preheating type for being provided with SOFA (distant place burnout degree) at this is low It is straight by appropriate design outer second air nozzle diameter size and SOFA wind direct current spouts in the boiler that NOx combustion device is applied Footpath size causes the Air compress pump < 1.0 in primary zone, combustion adjusting the ratio of eddy flow outer second air and SOFA wind The Air compress pump > 1.0 in cinder area.
In order to improve the regulator of the gentle monitoring burning of Automated water, the burner is equipped with high energy ignition unit, oil Rifle and infra red flame monitoring device.In order to extend the service life of oil gun and high energy ignition unit, combined pneumatic propulsion is equipped with Device.When igniting is needed, propeller runs forward an oil gun and high-energy igniter is sent to ignition location.But after igniting terminates, push away Enter device to run backward, oil gun and high-energy igniter are shunk back into core pipe, it is to avoid high temperature washes away, corrodes and coking pollution.
In order to improve the stability of coal dust firing, steady flame tooth is set in First air exit;Outside First air breeze airflow Enclose setting inner second air;Inner second air is divided into direct current inner second air and eddy flow inner second air further through flap valve;It is secondary in direct current Wind export expansion certain angle α, it is desirable to which α angular ranges are at 20~30 degree.
In order to ensure combustion efficiency, it is desirable to which radian measure beta angular range is at 25~35 degree in precombustion chamber;Require eddy flow outer second air The orientation angle γ angular ranges of spout are at 25~35 degree;The orientation angle θ angular ranges for requiring eddy flow outer second air spout exist 25~35 degree.
In order to improve the stability of coal dust firing, some tangential swirl blades are provided with eddy flow inner second air passage, By the eddy flow inner second air that tangential swirl blade is produced, strong disturbance and mixing not only can be added, can be with the formation in pre-burning room Recirculating zone, and then improve the stability of coal dust firing;By adjust inner second air flap valve, can adjust direct current inner second air and The ratio of eddy flow inner second air, and then swirl strength and the recirculating zone of inner second air can be adjusted according to the difference of coal Size;Pulverized Coal Concentration ring is set in First air sleeve pipe.When breeze airflow clashes into concentration ring, due to effect of inertia, coal dust It is separated into interior dense outer light type air-flow.Dense, the light air-flow in both sides centered on after coal dust penetrating preheating chamber.
Outer second air is sprayed by 18 tilting whirl holes, forms recirculating zone.The close precombustion chamber outlet of wherein tilting whirl hole Place, the outer second air that it sprays forms eddy flow outer second air around precombustion chamber outlet axes, it is ensured that excessive empty in pre-burning room Therefore gas coefficient does not increase, and then ensures the low-oxygen environment of precombustion chamber, further reduces the discharge of NOx pollutant.
SOFA wind is sprayed by 18 SOFA wind direct currents spouts in precombustion chamber closure periphery, what the aftercombustion later stage needed Oxygen, makes combustible in later stage further after-flame, flying dust is reduced, and spray into SOFA wind to also reduce ignition temperature, so entering One step reduces NOx.
Because the indoor oxygen of preheating is almost run out by coal dust firing.Therefore pulverized coal conveying, soot, unburned volatilization Grade and be practically free of oxygen in the mixed gas of burner hearth, beneficial to tissue coal dust high-temperature and low-oxygen combustion in burner hearth, enter one Step reduces the discharge of NOx pollutant.
First air, inner second air, outer second air, SOFA wind etc. adopt staged air distribution, it is ensured that primary zone is hypoxia ring in stove Border, makes the Blausure (German) etc. for entering burner hearth to generate N with oxygen reaction under low oxygen conditions2、CO2And H2O, further reduces NOx Growing amount.
The course of work of the present utility model:
First, inner second air is sent into by inner second air entrance, inner second air respectively enters direct current inner second air passage 7 With eddy flow inner second air passage 8, and respectively pre-burning entered by direct current inner second air sleeve 20 and eddy flow inner second air sleeve 21 In room 14, the purging of more than 1 minute is carried out to precombustion chamber.Then combined pneumatic propeller 3 is run forward, by high-energy ignition Device 1 and oil gun 2 are sent into and specify ignition location.High energy ignition unit 1 works, and ignite oil gun 2.By inner second air by interior secondary Wind entrance is sent into, and inner second air respectively enters direct current inner second air passage 7 and eddy flow inner second air passage 8, and respectively by straight Stream inner second air sleeve 20 and eddy flow inner second air sleeve 21 are entered in precombustion chamber 14.The inner setting of eddy flow inner second air passage 8 Some tangential swirl blades 22 can make the secondary wind in the passage produce rotation, and this strand of eddy flow inner second air can be in precombustion chamber 14 front ends produce recirculating zone, contribute to stablizing for burning.The mixture of coal dust and air is sent into by First air coal powder entrance 23, should Flow in circular passage of the mixture between First air sleeve 6 and core pipe 5, due to effect of inertia, by Pulverized Coal Concentration It is separated into that center is dense, the breeze airflow that surrounding is light after ring 19, after it enters precombustion chamber 14, calorific value occurs, and by the shape of oil gun 2 Into flame ignition.Pulverized Coal Concentration ring 19, steady flame tooth 17 and direct current inner second air enlarging 18 make coal dust stably burn.By control The aperture of direct current inner second air regulating valve 25 and eddy flow inner second air regulating valve 24 in flap valve 9, can be adjusted two in direct current The ratio of secondary wind and eddy flow inner second air, and then the swirl strength of inner second air can be adjusted according to the difference of coal and is returned The size in stream area.In the case of the oxygen that First air and inner second air are produced is insufficient, Blausure (German) that pulverized coal pyrolysis are produced etc. Generate N with oxygen reaction under low oxygen conditions2、CO2And H2O, reduces the growing amount of NOx.Outer second air is by being arranged on pre-burning Oxygen required for the tilting outer second air spout 15 of the second half section of room housing 13 sprays, and then supplement burns away, due to two Secondary wind snout 15 is tilting, so outer second air is eddy flow projecting, eddy flow outer second air collects in precombustion chamber outlet axes Near, recirculating zone can be formed, and then rolls up the high-temperature flue gas inhaled in burner hearth and stably be burnt, and oxygen content is reduced, keep reproducibility Atmosphere, reduce further the growing amount of NOx.Outer second air and volume inhale high-temperature flue gas and not completely burned off fuel and Fly ash combustible material uniformly mixes in the second half section of precombustion chamber, is then fed into hearth combustion.SOFA wind is in precombustion chamber shell by 18 The SOFA wind direct currents spout 16 of the periphery of body 13 is injected to burner hearth, and the oxygen that the aftercombustion later stage needs makes combustible enter in the later stage One step after-flame, reduces flying dust, and sprays into SOFA wind to also reduce ignition temperature, so further reducing the growing amount of NOx.Treat After the flameholding of precombustion chamber 14, the action of combined pneumatic propeller 3, by oil gun 2 and the retraction core pipe 5 of high energy ignition unit 1, To extend its service life.Simultaneously infra red flame monitoring device 10 is by the second flame peeped in the burning of the real-time monitoring of fiery device 11 State, when putting out a fire, sends alarm, and the input of stopping coal dust in time, re-executes purging and ignition operation.
Above content is only to illustrate technological thought of the present utility model, it is impossible to limit protection model of the present utility model with this Enclose, it is every according to the utility model proposes technological thought, any change done on the basis of technical scheme each falls within this reality Within protection domain with new claims.

Claims (10)

1. the high temperature gases recirculating preheating type low-NOx combustor of SOFA is provided with, it is characterised in that including precombustion chamber (14), pre-burning The inlet side of room (14) arranges core pipe (5), and core pipe (5) is arranged with successively outward First air sleeve (6), direct current inner second air Sleeve (20) and eddy flow inner second air sleeve (21);Oil gun (2) and high energy ignition unit (1) are stretched by the end of core pipe (5) Enter, and extend out in precombustion chamber (14) by front end;Outer second air and SOFA windband cylinders, precombustion chamber are provided with precombustion chamber (14) (14) some outer second air spouts (15) are offered on side wall, precombustion chamber (14) hull outside arranges some SOFA wind direct current sprays Mouth (16);The entrance of First air sleeve (6) is connected with First air entrance (23);The entrance of direct current inner second air sleeve (20) with Direct current inner second air passage (7) is connected, and outlet is connected with precombustion chamber (14);The entrance of eddy flow inner second air sleeve (21) with Eddy flow inner second air passage (8) is connected, and outlet is connected with precombustion chamber (14).
2. the high temperature gases recirculating preheating type low-NOx combustor for being provided with SOFA according to claim 1, it is characterised in that End connection combined pneumatic propeller (3) of the oil gun (2) and high energy ignition unit (1), when igniting is needed, combination type Oil gun (2) and high energy ignition unit (1) are delivered to ignition location by pneumatic booster (3), after igniting terminates, by oil gun (2) and High energy ignition unit (1) is shunk back in core pipe (5).
3. the high temperature gases recirculating preheating type low-NOx combustor for being provided with SOFA according to claim 1 and 2, its feature exists In the end of the core pipe (5) arranges first and peeps fiery device (4), and infra red flame inspection is arranged on precombustion chamber (14) rear end side wall Survey device (10) and second and peep fiery device (11).
4. the high temperature gases recirculating preheating type low-NOx combustor for being provided with SOFA according to claim 1, it is characterised in that The exit of the First air sleeve (6) is provided for the Pulverized Coal Concentration ring (19) and steady flame tooth of the stability for improving coal dust firing (17)。
5. the high temperature gases recirculating preheating type low-NOx combustor for being provided with SOFA according to claim 1, it is characterised in that The entrance of the direct current inner second air passage (7) and eddy flow inner second air passage (8) be provided for adjust direct current inner second air and The flap valve (9) of the air intake ratio of eddy flow inner second air;The exit of eddy flow inner second air passage (8) arranges tangential swirl blade (22)。
6. the high temperature gases recirculating preheating type low-NOx combustor for being provided with SOFA according to claim 5, it is characterised in that Direct current inner second air regulating valve (25) and eddy flow inner second air regulating valve (24) are provided with the flap valve (9), by adjusting The aperture of direct current inner second air regulating valve (25) and eddy flow inner second air regulating valve (24), is adjusted in direct current inner second air and eddy flow The ratio of secondary wind.
7. the high temperature gases recirculating preheating type low-NOx combustor for being provided with SOFA according to claim 1, it is characterised in that The outlet of the direct current inner second air sleeve (20) expands outwardly angle [alpha], 20 °≤α≤30 °.
8. the high temperature gases recirculating preheating type low-NOx combustor for being provided with SOFA according to claim 1, it is characterised in that The inwall of precombustion chamber inlet side and the angle of horizontal direction are β, 25 °≤β≤35 °.
9. the high temperature gases recirculating preheating type low-NOx combustor for being provided with SOFA according to claim 1, it is characterised in that The axially position angle of the outer second air spout (15) be γ, 25 °≤γ≤35 °, circumferentially positioned angle be θ, 25 °≤θ≤35 °, The outer second air for making ejection forms eddy flow outer second air around precombustion chamber (14) outlet axes.
10. the high temperature gases recirculating preheating type low-NOx combustor for being provided with SOFA according to claim 1, it is characterised in that Precombustion chamber (14) hull outside arranges 18 SOFA wind direct current spout (16).
CN201621103794.5U 2016-10-08 2016-10-08 Low NOx combustor of high temperature flue gas backward flow pre -burning formula with SOFA Active CN206130963U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106287667A (en) * 2016-10-08 2017-01-04 西安交通大学 A kind of high temperature gases recirculating preheating type low-NOx combustor being provided with SOFA
CN107355776A (en) * 2017-07-13 2017-11-17 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

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106287667A (en) * 2016-10-08 2017-01-04 西安交通大学 A kind of high temperature gases recirculating preheating type low-NOx combustor being provided with SOFA
CN106287667B (en) * 2016-10-08 2018-10-30 西安交通大学 A kind of high temperature gases recirculating preheating type low-NOx combustor equipped with SOFA
CN107355776A (en) * 2017-07-13 2017-11-17 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

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Assignee: Xi'an Jiaotong University Siyuan Technology Co., Ltd.

Assignor: Xi'an Jiaotong University

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Denomination of utility model: High temperature flue gas recirculation precombustion type low NOx combustor provided with SOFA

Granted publication date: 20170426

License type: Common License

Record date: 20180408