CN104121581B - A kind of high efficency low NOx tubular heater low concentration oxygen-enriched combustion system and burner - Google Patents
A kind of high efficency low NOx tubular heater low concentration oxygen-enriched combustion system and burner Download PDFInfo
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- CN104121581B CN104121581B CN201410352992.4A CN201410352992A CN104121581B CN 104121581 B CN104121581 B CN 104121581B CN 201410352992 A CN201410352992 A CN 201410352992A CN 104121581 B CN104121581 B CN 104121581B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Abstract
The present invention relates to a kind of high efficency low NOx tubular heater low concentration oxygen-enriched combustion system and burner, air and oxygen-enriched air are sufficiently mixed in static mixer, air preheater is heated, jointly radiation chamber is injected by burner with combustion gas, burn in mixing limit, limit, medium in heating radiation boiler tube and convection coil, flue-gas temperature reduces through air preheater, air-introduced machine enter chimney；High efficency low NOx oxygen-enriched burner adopts the mixed effect of average rate speed increaser and the strengthening combustion gas of combustion gas classification technique and air, dispersed flame, reduction flame temperature, it is suppressed that the growing amount of NOx during oxygen-enriched combusting.The present invention reduces the combustion-supporting oxidant quantity delivered of tubular heater and flue gas volume, reduce aerator and air-introduced machine power consumption, improve CO in flue gas2Concentration, reduces CO2The cost caught and separate, effectively inhibits massive discharge of pollutant in combustion process.
Description
[technical field]
The present invention relates to Petrochemical Enterprises tubular heater technical field, specifically, be a kind of high efficency low NOx tubular heater low concentration oxygen-enriched combustion system and burner.
[background technology]
Tubular heater is the Furnace used in Petrochemical Enterprises, and in the combustor that refractory material surrounds, the medium in boiler tube is heated to required temperature by the heat that fuel combustion produces, so as to produce reaction or reach the requirement of subsequent technique.At present, tubular heater is many with oil refinery dry gas for fuel, using air as oxidant, forms flame through gas burner in radiation chamber, successively the medium in heating radiation boiler tube and convection coil.About containing the nitrogen (volume fraction) of 78% in air, owing to nitrogen is not involved in combustion reaction, substantial amounts of nitrogen discharged to air, causes substantial amounts of thermal loss with exhaust gas temperature, reduces the thermal efficiency of heating furnace；On the other hand, a large amount of nitrogen in air cause the power consumption waste of the power-equipment such as aerator, air-introduced machine, reduce the overall efficiency of heating furnace.Oxygen-enriched combustion technology, by the oxygen in enriched air, reduces the concentration of nitrogen, reduces heat loss due to exhaust gas, improves stove effect.The increase of oxygen concentration enhances combustion process, has promoted the burning of fuel gas with low heat value, moreover it is possible to increase the treating capacity of stove.Oxygen-enriched combustion technology has obtained in fields such as glass, cement, metallurgy, the ignition trigger of pulverized-coal fired boiler, oil field heating furnaces and has been widely applied.Owing to mostly being the medium that hydro carbons, hydrogen etc. are inflammable and explosive in tubular heater boiler tube, and there is bigger difference in chamber structure and general industry kiln, and therefore oxygen-enriched combustion technology is not yet applied on the tubular heater of Petrochemical Enterprises.
Oxygen-enriched combustion technology is divided into low concentration (21～35%), intermediate concentration (～60%), high concentration (90～99%) oxygen-enriched combusting and pure oxygen burning according to degree of enrichment.Research shows, in combustion-supporting oxidant, carrier of oxygen volume concentrations is less than 95%, flame temperature increases along with the increase of oxygen concentration, causes the concentration of the nitrogen oxides in flue gas to sharply increase, contaminated environment.Only when in oxidant, oxygen concentration is more than 95%, due to the minimizing of nitrogen gas concn so that nitrogen oxides in effluent concentration is lower than the concentration with air oxidant.The oxygen that this purity is higher is expensive, adds operating cost, makes oxygen-enriched combustion technology no longer economical.
The tubular heater fuel consumption of petrochemical plant is all relatively larger, the oil plant of medium working depth, and the fuel consumption of heating furnace is about the 4～8% of crude Treatment ability, and fuel cost accounts for the 60～70% of its operating cost.Develop efficient tubular heater oxygen-enriched combustion system and can be effectively improved the efficiency of refinery heating furnace, reduce entreprise cost.Burner is the nucleus equipment that tissue combustion gas mixes with oxidant, burns, and is control combustion process pollutant, the key equipment that especially nitrogen oxides produces.Low-NOx combustor, compared with denitration device after burning, has feature efficient, low cost.Developing low NOx oxygen-enriched burner is the effective measures suppressing oxygen-enriched combusting to cause discharged nitrous oxides too high.
[summary of the invention]
It is an object of the invention to overcome the deficiencies in the prior art, it is provided that a kind of high efficency low NOx tubular heater low concentration oxygen-enriched combustion system and burner；The nitrogen ratios in air can be reduced, reduce flue gas volume and heat loss due to exhaust gas, reduce the power consumption of the power-equipment such as aerator, air-introduced machine；Low NOx gas burner is adopted effectively to suppress the generation of NOx, it is achieved the energy-saving and emission-reduction of refinery tubular heater.NOx is the abbreviation of nitrogen oxides.
It is an object of the invention to be achieved through the following technical solutions:
A kind of high efficency low NOx tubular heater low concentration oxygen-enriched combustion system, it is characterised in that
Oxygen-enriched air and air are sufficiently mixed in static mixer, form the mixing gas being called combustion-supporting oxidant；Combustion-supporting oxidant preheats through air preheater, enters burner by air inlet；From the oil refinery dry gas of refinery's pipe network, inject the radiation chamber of tubular heater through burner；Oil refinery dry gas burns on radiation chamber inner edge mixing limit with combustion-supporting oxidant, and the medium in the heat radiating furnace tube of burning release and convection coil, flue gas cools down through air preheater, air-introduced machine send into chimney, and NOx is nitrogen oxides.
Described oxygen-enriched air is provided by film oxygen enriching device, Oxygen-Rich Gas by PSA or cryogenic air separation unit oxygenerator.
Described air preheater is the one in heat pipe preheater, tubular air preheater or plate air preheater.
The mixing gas that described oxygen-enriched air and air are formed after being sufficiently mixed in static mixer is called that combustion-supporting oxidant, the oxygen purity in combustion-supporting oxidant are 21～35%, and namely system under air or low concentration oxygen enrichment operating mode, well can be run.
Described tubular heater radiation chamber exit, equipped with zirconium oxide oxygen concentration sensor, is used for the oxygen content controlling in flue gas.
All installing ultrasound wave oxygen concentration sensor before and after described static mixer, it has the advantages that broad quantum, volume are little, easy for installation.
A kind of high efficency low NOx oxygen rich fuel gas burner for above-mentioned high efficency low NOx tubular heater low concentration oxygen-enriched combustion system, this burner is made up of cylinder, air inlet, average rate speed increaser, center gas gun, classification gas gun, stable flame cover, brazier brick, altar lamp, fire hole, flame-observing hole, metal hose and silencer wall；It is characterized in that, described average rate speed increaser includes being welded on average rate speedup array tube bank between upper perforated plate and lower perforated plate；Air inlet is welded on cylinder side, average rate speed increaser is fixed on inner barrel by the mode of welding or rivet interlacement, silencer wall is tightly riveted on cylinder inboard wall, cylinder bottom plate has fire hole and flame-observing hole, altar lamp, center gas gun and classification gas gun are bolted on cylinder bottom plate, stable flame cover is bolted on the upper end of center gas gun, and brazier brick relies on self gravitation to be arranged on cylinder top, the hole that classification gas gun is opened on brazier brick.
High efficency low NOx oxygen rich fuel gas burner classification gas gun gas flow accounts for the 65～80% of the total gas flow of burner, and classification gas gun is 4～12.
On high efficency low NOx oxygen rich fuel gas burner centre gas gun, position of opening is corresponding with classification gas gun.
High efficency low NOx oxygen rich fuel gas burner brazier brick is monoblock type or sectional type, and leaves the installing hole of classification gas gun on brazier brick.
Oxidant flow velocity in the tube bank of high efficency low NOx oxygen rich fuel gas burner combustion-supporting oxidant average rate speedup array is 10～40m/s, average rate speedup array tube bank two ends are welded with lower perforated plate, upper lower perforated plate has lamp hole kept burning day and night in identical position, and upper lower perforated plate is fixed on burner cylinder by the mode of welding or rivet interlacement.
Compared with prior art, the method have the advantages that
(1) oxygen concentration in the combustion-supporting oxidant of heating furnace is entered higher than in air, on the one hand, add flame temperature, add radiation chamber heat output accounting in total load, be beneficial to the operating load improving device；On the other hand, oil refinery dry gas rapid fire and after-flame are promoted.
(2) ultrasound wave oxygen concentration sensor is all installed before and after static mixer, can regulate, according to going out oxygen concentration in the combustion-supporting oxidant of blender, the air mass flow and oxygen-enriched air flow that enter blender, make oxygen purity control in the scope of 21～35%.
(3), before static mixer is arranged on air preheater, make the steam being likely in oxygen-enriched air carry secretly fully vaporize in air preheater, fully absorb fume afterheat, reduce exhaust gas temperature further.
(4) high efficency low NOx oxygen rich fuel gas burner adopts the form of combustion gas classification to reduce NOx, fractional combustion makes flame disperse, and reduces flame temperature and the NOx that reduction portion centers fuel gas buring produces, entrainment inner flue gas of the stove to dilute combustion gas, it is suppressed that the formation of classification flame temperature and NOx simultaneously.
(5) high efficency low NOx oxygen rich fuel gas burner employing average rate speed increaser increases uniformity and the flowing velocity that combustion-supporting oxidant flows in burner tube body, the mixed effect between strengthening combustion gas and combustion-supporting oxidant, reduces the growing amount of NOx.
[accompanying drawing explanation]
Fig. 1 is the structural representation of the high efficency low NOx tubular heater low concentration oxygen-enriched combustion system under one embodiment of the present of invention.
Fig. 2 (a) is the high efficency low NOx oxygen rich fuel gas burner front view under one embodiment of the present of invention.
Fig. 2 (b) is the high efficency low NOx oxygen rich fuel gas burner top view under one embodiment of the present of invention.
Fig. 3 is the average rate speed increaser structural representation of the high efficency low NOx oxygen rich fuel gas burner under one embodiment of the present of invention.
When Fig. 4 is different oxygen-enriched concentration under one embodiment of the present of invention, unit combustion gas produces the schematic diagram of exhaust gas volumn.
Being labeled as in accompanying drawing: 1 aerator, 2 air channels, 3 oxygen-enriched air pipes, 4 oxygen-enriched air pipe butterfly valves, 5 ultrasound wave oxygen concentration sensors I, 6 static mixers, 7 ultrasound wave oxygen concentration sensors II, 8T type armoured thermocouple I, 9 oil refinery dry gas pipes, 10 Pressure gauges, 11 venturi vortex-shedding meters, 12 oil refinery dry gas sluice valves, 13 high efficency low NOx oxygen rich fuel gas burners, 14 tubular heaters, 15 radiating furnace tubes, 16 flames, 17 radiation chambers, 18K type armoured thermocouple, 19 zirconium oxide oxygen concentration sensors, 20 convection coils, 21 chimney controllable registers, 22 chimneys, 23 air preheaters, 24T type armoured thermocouple II, 25 air-introduced machines, 131 combustion gas metal hoses, 132 altar lamp combustion gas metal hoses, the connection metal hose of 133 center rifles and classification rifle, 134 air inlet butterfly valves, 135 air inlets, 136 burner cylinders, 137 silencing cottons, 138 bolts, 139 average rate speed increasers, 1310 heating-furnace base plates, 1311 furnace bottom refractory brick, 1312 brazier bricks, 1313 altar lamps, 1314 center gas guns, 1315 stable flame covers, 1316 classification gas guns, 1317 flame-observing holes I, 1318 flame-observing holes II, 1391 lamp holes I kept burning day and night, 1392 lamp holes II kept burning day and night, 1393 average rate speed increaser upper perforated plates, 1394 average rate speed increaser lower perforated plates, 1395 average rate speedup array tubes.
[detailed description of the invention]
The detailed description of the invention of the present invention presented below a kind of high efficency low NOx tubular heater low concentration oxygen-enriched combustion system and burner.
Embodiment 1
A kind of high efficency low NOx tubular heater low concentration oxygen-enriched combustion system, oxygen-enriched air and air are sufficiently mixed in static mixer, preheat through air preheater, with the oil refinery dry gas from refinery's pipe network, inject the radiation chamber of tubular heater through burner, burn on radiation chamber inner edge mixing limit, the medium in the heat radiating furnace tube of burning release and convection coil, flue gas cools down through air preheater, air-introduced machine send into chimney.
A kind of high efficency low NOx oxygen rich fuel gas burner, this burner is made up of cylinder, air inlet, average rate speed increaser, center gas gun, classification gas gun, stable flame cover, brazier brick, altar lamp, fire hole, flame-observing hole, metal hose and silencer wall；Air inlet is welded on cylinder side, average rate speed increaser is fixed on inner barrel by the mode of welding or rivet interlacement, silencer wall is tightly riveted on cylinder inboard wall, cylinder bottom plate has fire hole and flame-observing hole, altar lamp, center gas gun and classification gas gun are bolted on cylinder bottom plate, and stable flame cover is bolted on the upper end of center gas gun, brazier brick relies on self gravitation to be arranged on cylinder top, the hole that classification gas gun is opened on brazier brick.
A kind of high efficency low NOx tubular heater low concentration oxygen-enriched combustion system, as it is shown in figure 1, include oil refinery dry gas pipe, aerator, oxygen-enriched air pipe, air and oxygen-enriched air static mixer, air preheater, burner, venturi vortex-shedding meter, ultrasound wave oxygen concentration sensor, tubular heater, air-introduced machine；It is characterized in that the oxygen-enriched air from cryogenic air separation unit oxygenerator mixes in static mixer 6 with the air from aerator 1, the oxygen concentration of oxygen-enriched air is measured by ultrasound wave oxygen concentration sensor I 5, flow is controlled by oxygen-enriched air pipe butterfly valve 4, mixed gas is called combustion-supporting oxidant, in combustion-supporting oxidant, oxygen concentration is measured by ultrasound wave oxygen concentration sensor II 7, in combustion-supporting oxidant, oxygen concentration controls between 21～35% in the present invention, is 25% in the present embodiment；Combustion-supporting oxidant is through heat pipe preheater 23 and flue gas heat exchange, and preheating temperature is measured by T-shaped armoured thermocouple I 8；Oil refinery dry gas from oil refinery dry gas pipe 9 forms flame 16 with combustion-supporting oxidant through high efficency low NOx oxygen rich fuel gas burner 13 in the radiation chamber 17 of tubular heater 14, by heat mainly with the medium of flowing in thermal-radiating form heating radiation boiler tube 15, the pressure of oil refinery dry gas is measured by Pressure gauge 10, flow is measured by venturi vortex-shedding meter 11, and flow is regulated by oil refinery dry gas sluice valve 12 according to technical load；K type armoured thermocouple 18 and zirconium oxide oxygen concentration sensor 19 are set in the exit of radiation chamber 17, combustion product gases main form with convection heat transfer' heat-transfer by convection in convection cell heats the medium of flowing in convection coil 20, negative pressure and the exhaust gas volumn being directly entered chimney 22 in stove is controlled by gas proportioning damper 21, in the present embodiment, damper closes entirely；Heat smoke is preheated-combustion-supporting oxidant in heat pipe preheater 23, and temperature reduces, and sends into chimney 22 through air-introduced machine 25, and the exhaust gas temperature of heat pipe preheater 23 is measured by T-shaped armoured thermocouple II 24, controls exhaust gas temperature.
High efficency low NOx oxygen rich fuel gas burner 13 includes connecting metal hose, center gas gun, classification gas gun, flame-observing hole, altar lamp, air inlet, air inlet butterfly valve, cylinder, silencing cotton 137, average rate speed increaser 139, stable flame cover, brazier brick and connecting bolt 138, as shown in Fig. 2 (a), (b)；It is characterized in that oil refinery dry gas enters combustion gas metal hose 131, wherein 75% even into 6 classification gas guns 1316, and residue 25% enters center gas gun 1314 by the connection metal hose 133 of center rifle with classification rifle；Combustion-supporting oxidant is entered burner cylinder 136 by air inlet 135, completes to accelerate in 6 average rate speedup array tubes 1395, and flow is controlled by air inlet butterfly valve 134；Center combustion gas sprays at brazier brick 1312 center, tentatively mix with combustion-supporting oxidant, form initial combustion district, classification combustion gas sprays on brazier brick 1312 top, the second combustion zone is formed with combustion-supporting oxidant, stable flame cover 1315 is bolted on center gas gun 1314, a small amount of oil refinery dry gas from oil refinery dry gas pipe network enters altar lamp combustion gas metal hose 132, altar lamp 1313 restrains the lamp hole kept burning day and night II 1392 of lower perforated plate 1394 and the lamp hole kept burning day and night I 1391 of upper perforated plate 1393 through average rate speedup array, the flame that interruption-forming is stable is gone out at altar lamp 1313, guarantee when center gas gun 1314 can be lighted after extinguishing in time.In the present embodiment, high efficency low NOx oxygen rich fuel gas burner is fixed on heating-furnace base plate 1310 by bolt 138, and burner base is additionally provided with flame-observing hole I 1317 and flame-observing hole II 1318.6 average rate velocity hoosters 1395 are welded between upper perforated plate 1393 and lower perforated plate 1394, as it is shown on figure 3, Tube-sheet Welding is on burner cylinder 136 up and down.Heating-furnace base plate 1310 arranges furnace bottom refractory brick 1311.Tubular heater system operation exists fluctuation, should regulate in time.As when ultrasound wave oxygen concentration sensor II 7 detects that in combustion-supporting oxidant, oxygen concentration is too high, it should turn the aperture of oxygen-enriched air pipe butterfly valve 4 down, increase the power of aerator 1, to keep the oxygen flow being supplied to heating furnace constant simultaneously.And for example, when medium temperature is higher than setting value in radiating furnace tube 15 exit is managed, it should turn the aperture of oil refinery dry gas sluice valve 12 down, reduce gas supply amount, reduce the power of the aperture of oxygen-enriched air pipe butterfly valve 4 and aerator 1 simultaneously, with maintain that flame profile is stable and in flue gas oxygen content not too high.Air is sent into static mixer 6 by air channel 2 by aerator 1.When in radiating furnace tube 15 exit is managed, medium temperature is lower than setting value, the aperture of oil refinery dry gas sluice valve 12 should be increased, increase gas supply amount, increase aperture and aerator 1 power of oxygen-enriched air pipe butterfly valve simultaneously, with maintain that flame profile is stable and in flue gas oxygen content not too low, it is ensured that the burning completely of oil refinery dry gas.For another example, when the oxygen concentration that zirconium oxide oxygen concentration sensor records is too high, the aperture of oxygen-enriched air pipe butterfly valve 4 and the power of aerator 1 should be reduced, check whether high efficency low NOx oxygen rich fuel gas burner 13 and tubular heater 14 exist simultaneously and leak out, and mending-leakage in time.
In the present embodiment, the component of oil refinery dry gas is as shown in table 1 below.The load of high efficency low NOx oxygen rich fuel gas burner 13 is 1.4MW, the flow of oil refinery dry gas is 107.6kg/h, excessive oxygen coefficient 1.05, oxygen purity 21% during air, flow 1800kg/h, oxygen purity 25% during low concentration oxygen enrichment, flow 1512kg/h, minimizing 16% compared with during with air.Oil refinery dry gas pressure before high efficency low NOx oxygen rich fuel gas burner 13 is 120kPa (gauge pressure), air or combustion-supporting oxidant pressure before high efficency low NOx oxygen rich fuel gas burner 13 are 100Pa (gauge pressure), air or the combustion-supporting oxidant preheating temperature 373K before high efficency low NOx oxygen rich fuel gas burner 13.
Table 1
Burn results shows, when using air as combustion-supporting oxidant, air velocity in the tube bank of average rate speedup array is 21m/s, containing the nitrogen of 72.45% in flue gas, the oxygen of 1.05%, the water of 16.84%, the carbon dioxide of 9.73%, in flue gas, carbon monoxide content is less than 50ppm, and the concentration of nitrogen oxides in effluent is 67.0mg/Nm3(3%O2Dry flue gas).
Burn results shows, when combustion-supporting oxidant contains the oxygen of 25% volume fraction, flow velocity in the tube bank of average rate speedup array is 17m/s, containing the nitrogen of 67.69% in flue gas, the oxygen of 1.11%, the water of 19.80%, the carbon dioxide of 11.4%, in flue gas, carbon monoxide content is less than 50ppm, and the concentration of nitrogen oxides in effluent is 172.9mg/Nm3(3%O2Dry flue gas), lower than standard value 240mg/Nm3(GB16297 1996 discharge standard of air pollutants).
Burn results shows, high efficency low NOx tubular heater low concentration oxygen-enriched combustion system of the present invention and burner, ensure that oil refinery dry gas burning completely, pollutant emission is lower than national standard, combustion-supporting oxidant is made compared with air with oxygen-enriched air, improve carbon dioxide in flue gas concentration, be conducive to subsequent captured and the separation of carbon dioxide.
Fig. 4 represents when doing combustion gas with the present embodiment oil refinery dry gas, under combustion-supporting oxidant difference oxygen concentration, and the flue gas volume amount that unit volume oil refinery dry gas produces.Along with the increase of oxygen purity in combustion-supporting oxidant, exhaust gas volumn reduces, aerator, air-introduced machine load reduce, power consumption reduces.
The air of the present invention and oxygen-enriched air are sufficiently mixed in static mixer, air preheater is heated, jointly radiation chamber is injected by burner with combustion gas, burn in mixing limit, limit, medium in heating radiation boiler tube and convection coil, flue-gas temperature reduces through air preheater, air-introduced machine enter chimney；High efficency low NOx oxygen-enriched burner adopts the mixed effect of average rate speed increaser and the strengthening combustion gas of combustion gas classification technique and air, dispersed flame, reduction flame temperature, it is suppressed that the growing amount of NOx during oxygen-enriched combusting.The present invention reduces the combustion-supporting oxidant quantity delivered of tubular heater and flue gas volume, reduce aerator and air-introduced machine power consumption, improve CO in flue gas2Concentration, reduces CO2The cost caught and separate, effectively inhibits massive discharge of pollutant in combustion process.
The above is only the preferred embodiment of the present invention; it should be pointed out that, for those skilled in the art, without departing from the inventive concept of the premise; can also making some improvements and modifications, these improvements and modifications also should be regarded as in protection scope of the present invention.
Claims (10)
1. a high efficency low NOx tubular heater low concentration oxygen-enriched combustion system, it is characterised in that oxygen-enriched air and air are sufficiently mixed in static mixer, forms the mixing gas being called combustion-supporting oxidant；Combustion-supporting oxidant preheats through air preheater, enters burner by air inlet；From the oil refinery dry gas of refinery's pipe network, inject the radiation chamber of tubular heater through burner；Oil refinery dry gas burns on radiation chamber inner edge mixing limit with combustion-supporting oxidant, and the medium in the heat radiating furnace tube of burning release and convection coil, flue gas cools down through air preheater, air-introduced machine send into chimney, and NOx is nitrogen oxides.
2. a kind of high efficency low NOx tubular heater low concentration oxygen-enriched combustion system as claimed in claim 1, it is characterised in that described oxygen-enriched air is provided by film oxygen enriching device, Oxygen-Rich Gas by PSA or cryogenic air separation unit oxygenerator；
Described air preheater is the one in heat pipe preheater, tubular air preheater or plate air preheater.
3. a kind of high efficency low NOx tubular heater low concentration oxygen-enriched combustion system as claimed in claim 1, it is characterised in that the described oxygen purity in combustion-supporting oxidant is 21～35%.
4. a kind of high efficency low NOx tubular heater low concentration oxygen-enriched combustion system as claimed in claim 1, it is characterised in that described tubular heater radiation chamber exit is equipped with zirconium oxide oxygen concentration sensor.
5. a kind of high efficency low NOx tubular heater low concentration oxygen-enriched combustion system as claimed in claim 1, it is characterised in that all install ultrasound wave oxygen concentration sensor before and after described static mixer.
6. the high efficency low NOx oxygen rich fuel gas burner for the high efficency low NOx tubular heater low concentration oxygen-enriched combustion system described in claim 1, it is by cylinder, air inlet, and average rate speed increaser, center gas gun, classification gas gun, stable flame cover, brazier brick, altar lamp, fire hole, flame-observing hole, metal hose and silencer wall are constituted；It is characterized in that, described average rate speed increaser includes the average rate speedup array tube bank being welded between upper perforated plate and lower perforated plate；Air inlet is welded on cylinder side, average rate speed increaser is fixed on inner barrel by the mode of welding or rivet interlacement, silencer wall is tightly riveted on cylinder inboard wall, cylinder bottom plate has fire hole and flame-observing hole, altar lamp, center gas gun and classification gas gun are bolted on cylinder bottom plate, stable flame cover is bolted on the upper end of center gas gun, and brazier brick relies on self gravitation to be arranged on cylinder top, the hole that classification gas gun is opened on brazier brick.
7. a kind of high efficency low NOx oxygen rich fuel gas burner as claimed in claim 6, it is characterised in that high efficency low NOx oxygen rich fuel gas burner classification gas gun gas flow accounts for the 65～80% of the total gas flow of burner, and classification gas gun is 4～12.
8. a kind of high efficency low NOx oxygen rich fuel gas burner as claimed in claim 6, it is characterised in that on high efficency low NOx oxygen rich fuel gas burner centre gas gun, position of opening is corresponding with classification gas gun.
9. a kind of high efficency low NOx oxygen rich fuel gas burner as claimed in claim 6, it is characterised in that high efficency low NOx oxygen rich fuel gas burner brazier brick is monoblock type or sectional type, and leaves the installing hole of classification gas gun on brazier brick.
10. a kind of high efficency low NOx oxygen rich fuel gas burner as claimed in claim 6, it is characterized in that, oxidant flow velocity in the tube bank of high efficency low NOx oxygen rich fuel gas burner combustion-supporting oxidant average rate speedup array is 10～40m/s, average rate speedup array tube bank two ends are welded with lower perforated plate, upper lower perforated plate has lamp hole kept burning day and night in identical position, and upper lower perforated plate is fixed on burner cylinder by the mode of welding or rivet interlacement.
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