CN104121581A - Efficient low-NOx tube type heating furnace low-concentration oxygen-enriched combustion system and combustor - Google Patents

Efficient low-NOx tube type heating furnace low-concentration oxygen-enriched combustion system and combustor Download PDF

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Publication number
CN104121581A
CN104121581A CN201410352992.4A CN201410352992A CN104121581A CN 104121581 A CN104121581 A CN 104121581A CN 201410352992 A CN201410352992 A CN 201410352992A CN 104121581 A CN104121581 A CN 104121581A
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oxygen
air
combustion
gas
enriched
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CN201410352992.4A
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CN104121581B (en
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徐宏
刘波
王元华
吴晓磊
李培俊
罗青
鲍彬彬
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华东理工大学
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00Combustion technologies with mitigation potential
    • Y02E20/34Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery

Abstract

The invention relates to an efficient low-NOx tube type heating furnace low-concentration oxygen-enriched combustion system and a combustor. Air and oxygen-enriched air are fully mixed in a static mixer and heated in an air pre-heater, air, oxygen-enriched and flue gas are injected into a radiation chamber jointly from the combustor and combust while being mixed, media in a radiation furnace tube and a convection furnace tube are heated, the flue gas temperature is lowered through the air pre-heater, and flue gas is exhausted into a chimney through an induced draft fan; the mixing effect of flue gas and air is strengthened by the adoption of a uniform speed increaser and the fuel gas classification technology through the efficient low-NOx oxygen-enriched combustor, flames are scattered, the flame temperature is lowered, and the amount of NOx generated during oxygen-enriched combustion is suppressed. The tube type heating furnace combustion-supporting oxidizing agent supply quantity and the gas fume area are reduced, power consumption of an air blower and the induced draft fan are reduced, the concentration of CO2 in gas fume is increased, CO2 capture and separation cost is lowered, and emission of a great number of contaminants are effectively suppressed in the combustion process.

Description

A kind of high efficency low NOx tubular heater low concentration oxygen-enriched combustion system and burner
[technical field]
The present invention relates to Petrochemical Enterprises tubular heater technical field, specifically, is a kind of high efficency low NOx tubular heater low concentration oxygen-enriched combustion system and burner.
[background technology]
Tubular heater is the Furnace using in Petrochemical Enterprises, and in the combustion chamber surrounding at refractory material, the heat that fuel combustion produces to required temperature, makes it to produce the requirement of reacting or reaching subsequent technique by the dielectric heating in boiler tube.At present, tubular heater is fuel mainly with oil refinery dry gas, using air as oxidant, forms flame through gas burner in radiation chamber, heats successively the medium in radiating furnace tube and convection coil.In air, approximately contain 78% nitrogen (volume fraction), because nitrogen does not participate in combustion reaction, a large amount of nitrogen discharged to atmosphere, causes a large amount of thermal loss with exhaust gas temperature, has reduced the thermal efficiency of heating furnace; On the other hand, airborne a large amount of nitrogen has caused the power consumption waste of the power-equipment such as air blast, air-introduced machine, has reduced 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.Combustion process has been strengthened in the increase of oxygen concentration, has promoted the burning of fuel gas with low heat value, can also increase the treating capacity of stove.Oxygen-enriched combustion technology has been obtained application widely in the field such as ignition trigger, oil field heating furnace of glass, cement, metallurgy, pulverized-coal fired boiler.Owing to mostly being the inflammable and explosive medium such as hydro carbons, hydrogen 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, the in the situation that in combustion-supporting oxidant, carrier of oxygen volume concentrations being less than 95%, flame temperature increases along with the increase of oxygen concentration, causes the concentration of the nitrogen oxide in flue gas sharply to increase, contaminated environment.Only have in the time that oxygen concentration is greater than 95% in oxidant, due to the minimizing of nitrogen gas concn, make nitrogen oxides in effluent concentration lower than the concentration with air oxidant.The oxygen that this purity is higher is expensive, has increased operating cost, makes oxygen-enriched combustion technology no longer economical.
The tubular heater fuel consumption of petrochemical plant is all larger, the oil plant of medium working depth, and the fuel consumption of heating furnace is about 4~8% of crude Treatment ability, and fuel cost accounts for 60~70% of its operating cost.Develop the efficiency that efficient tubular heater oxygen-enriched combustion system can effectively improve refinery heating furnace, reduce entreprise cost.Burner is the nucleus equipment of organizing combustion gas to mix, burn with oxidant, is control combustion process pollutant, the key equipment that especially nitrogen oxide produces.Low-NOx combustor is with after burning compared with denitration device, has efficiently, feature cheaply.Developing low NOx oxygen-enriched burner is to suppress oxygen-enriched combusting to cause the too high effective measures of discharged nitrous oxides.
[summary of the invention]
The object of the invention is to overcome the deficiencies in the prior art, a kind of high efficency low NOx tubular heater low concentration oxygen-enriched combustion system and burner are provided; Can reduce airborne nitrogen ratios, reduce flue gas volume and heat loss due to exhaust gas, reduce the power consumption of the power-equipments such as air blast, air-introduced machine; Adopt low NOx gas burner effectively to suppress the generation of NOx, realize the energy-saving and emission-reduction of refinery tubular heater.NOx is the abbreviation of nitrogen oxide.
The object of the invention is to be achieved through the following technical solutions:
A kind of high efficency low NOx tubular heater low concentration oxygen-enriched combustion system, is characterized in that,
Oxygen-enriched air fully mixes in static mixer with air, through air preheater preheating, with the oil refinery dry gas from refinery's pipe network, inject the radiation chamber of tubular heater through burner, in the burning of radiation chamber inner edge mixing limit, the medium in heat heating radiating furnace tube and convection coil that burning discharges, flue gas is cooling through air preheater, send into chimney by air-introduced machine, NOx is nitrogen oxide.
Described oxygen-enriched air is by film oxygen enriching device, and Oxygen-Rich Gas by PSA or cryogenic air separation unit oxygenerator provide.
Described air preheater is the one in heat pipe preheater, tubular air preheater or plate air preheater.
The mist forming after described oxygen-enriched air fully mixes in static mixer with air is called combustion-supporting oxidant, and the oxygen purity in combustion-supporting oxidant is 21~35%, and system can be under air or low concentration oxygen enrichment operating mode, well operation.
Zirconia oxygen concentration sensor is equipped with in described tubular heater radiation chamber exit, is used for controlling the oxygen content in flue gas.
Before and after described static mixer, ultrasonic wave oxygen concentration sensor is all installed, it has broad quantum, volume feature little, easy for installation.
A kind of high efficency low NOx oxygen rich fuel gas burner, this burner is by cylindrical shell, 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 form; It is characterized in that, air inlet is welded on cylindrical shell side, the mode that average rate speed increaser connects by welding or rivet is fixed on inner barrel, silencer wall is tightly riveted on cylinder inboard wall, has fire hole and flame-observing hole, altar lamp on cylinder bottom plate, 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 cylindrical shell top, and classification gas gun is through the hole of opening on brazier brick.
High efficency low NOx oxygen rich fuel gas burner classification gas gun gas flow accounts for 65~80% of the total gas flow of burner, and classification gas gun is 4~12.
On the gas gun of high efficency low NOx oxygen rich fuel gas burner center, position of opening is corresponding with classification gas gun.
High efficency low NOx oxygen rich fuel gas burner fire pot brick is monoblock type or sectional type, and on brazier brick, leaves the installing hole of classification gas gun.
The intrafascicular oxidant flow velocity of the combustion-supporting oxidant average rate of high efficency low NOx oxygen rich fuel gas burner speedup array tube 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 the mode that upper lower perforated plate connects by welding or rivet is fixed on burner cylindrical shell.
Compared with prior art, good effect of the present invention is:
(1) entering oxygen concentration in the combustion-supporting oxidant of heating furnace, than high in air, on the one hand, has increased flame temperature, has increased the accounting of radiation chamber heat output in total load, is beneficial to the operating load that improves device; On the other hand, impel oil refinery dry gas igniting and after-flame rapidly.
(2) ultrasonic wave oxygen concentration sensor is all installed before and after static mixer, can regulate the air mass flow and the oxygen-enriched air flow that enter blender according to going out oxygen concentration in the combustion-supporting oxidant of blender, oxygen purity is controlled in 21~35% scope.
(3) before static mixer is arranged on air preheater, the steam that may carry secretly in oxygen-enriched air is fully vaporized in air preheater, fully absorb fume afterheat, further reduce exhaust gas temperature.
(4) high efficency low NOx oxygen rich fuel gas burner adopts the form of combustion gas classification to reduce NOx, fractional combustion disperses flame, reduces flame temperature, and the NOx of reduction part center fuel gas buring generation, entrainment inner flue gas of the stove with dilution combustion gas simultaneously, suppress the formation of classification flame temperature and NOx.
(5) high efficency low NOx oxygen rich fuel gas burner adopts average rate speed increaser to increase combustion-supporting oxidant mobile uniformity and flowing velocity in burner cylindrical shell, and the mixed effect between strengthening combustion gas and combustion-supporting oxidant reduces the growing amount of NOx.
[brief description of the drawings]
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.
Fig. 4 is the schematic diagram that under one embodiment of the present of invention, the combustion gas of different oxygen-enriched concentration time unit produces exhaust gas volumn.
Being labeled as in accompanying drawing: 1 air blast, 2 air channels, 3 oxygen-enriched air pipes, 4 oxygen-enriched air pipe butterfly valves, 5 ultrasonic wave oxygen concentration sensor I, 6 static mixers, 7 ultrasonic wave oxygen concentration sensor 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 zirconia 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 flexible pipe of 133 center rifles and classification rifle, 134 air inlet butterfly valves, 135 air inlets, 136 burner cylindrical shells, 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 hole I, 1318 flame-observing hole II, 1391 lamp hole I kept burning day and night, 1392 lamp hole 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 a kind of high efficency low NOx tubular heater of the present invention low concentration oxygen-enriched combustion system and burner is below provided.
Embodiment 1
A kind of high efficency low NOx tubular heater low concentration oxygen-enriched combustion system, oxygen-enriched air fully mixes in static mixer with air, through air preheater preheating, with the oil refinery dry gas from refinery's pipe network, inject the radiation chamber of tubular heater through burner, in the burning of radiation chamber inner edge mixing limit, the medium in heat heating radiating furnace tube and convection coil that burning discharges, flue gas is cooling through air preheater, sends into chimney by air-introduced machine.
A kind of high efficency low NOx oxygen rich fuel gas burner, this burner is made up of cylindrical shell, 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 cylindrical shell side, the mode that average rate speed increaser connects by welding or rivet is fixed on inner barrel, silencer wall is tightly riveted on cylinder inboard wall, on cylinder bottom plate, have 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 cylindrical shell top, and classification gas gun is through the hole of opening on brazier brick.
A kind of high efficency low NOx tubular heater low concentration oxygen-enriched combustion system, as shown in Figure 1, comprise oil refinery dry gas pipe, air blast, oxygen-enriched air pipe, air and oxygen-enriched air static mixer, air preheater, burner, venturi vortex-shedding meter, ultrasonic wave oxygen concentration sensor, tubular heater, air-introduced machine; It is characterized in that mixing static mixer 6 is interior from the oxygen-enriched air of cryogenic air separation unit oxygenerator and air from air blast 1, the oxygen concentration of oxygen-enriched air is measured by ultrasonic wave oxygen concentration sensor I5, 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 ultrasonic wave oxygen concentration sensor II7, in combustion-supporting oxidant, oxygen concentration is controlled 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 preheat temperature is measured by T-shaped armoured thermocouple I8; From the oil refinery dry gas of oil refinery dry gas pipe 9 and combustion-supporting oxidant through high efficency low NOx oxygen rich fuel gas burner 13 the interior formation flame 16 of radiation chamber 17 at tubular heater 14, heat is mainly heated to the interior mobile medium of radiating furnace tube 15 with thermal-radiating form, 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 zirconia oxygen concentration sensor 19 are set in the exit of radiation chamber 17, combustion product gases is the main interior mobile medium of form heated convection boiler tube 20 with convection heat transfer' heat-transfer by convection in convection cell, the exhaust gas volumn of controlling negative pressure in stove and directly entering chimney 22 by gas proportioning damper 21, in the present embodiment, damper complete shut-down; Hot flue gas is at the interior preheated-combustion-supporting oxidant of 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 II24, controls exhaust gas temperature.
High efficency low NOx oxygen rich fuel gas burner 13 comprises connection metal flexible pipe, center gas gun, classification gas gun, flame-observing hole, altar lamp, air inlet, air inlet butterfly valve, cylindrical shell, 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% evenly enter 6 classification gas guns 1316, residue 25% enters center gas gun 1314 by the connection metal flexible pipe 133 of center rifle and classification rifle, combustion-supporting oxidant enters burner cylindrical shell 136 by air inlet 135, in 6 average rate speedup array tubes 1395, completes acceleration, and flow is controlled by air inlet butterfly valve 134, center combustion gas is in brazier brick 1312 center ejections, tentatively mix with combustion-supporting oxidant, form initial combustion district, classification combustion gas is in brazier brick 1312 top ejections, form the second combustion zone with combustion-supporting oxidant, stable flame cover 1315 is bolted on center gas gun 1314, enter altar lamp combustion gas metal hose 132 from a small amount of oil refinery dry gas of oil refinery dry gas pipe network, altar lamp 1313 is through the average rate speedup array tube bank lamp hole II1392 kept burning day and night of lower perforated plate 1394 and the lamp hole I1391 kept burning day and night of upper perforated plate 1393, go out the stable flame of interruption-forming at altar lamp 1313, guarantee can be lighted in time after center gas gun 1314 extinguishes.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 bottom is also provided with flame-observing hole I1317 and flame-observing hole II1318.6 average rate velocity hoosters 1395 are welded between upper perforated plate 1393 and lower perforated plate 1394, and as shown in Figure 3, upper and lower Tube-sheet Welding is on burner cylindrical shell 136.Furnace bottom refractory brick 1311 is set on heating-furnace base plate 1310.In tubular heater system running, there is fluctuation, should regulate in time.As in the time that ultrasonic wave oxygen concentration sensor II7 detects that in combustion-supporting oxidant, oxygen concentration is too high, should turn the aperture of oxygen-enriched air pipe butterfly valve 4 down, increase the power of air blast 1 simultaneously, constant to keep being supplied to the oxygen flow of heating furnace.And for example, in the time that in radiating furnace tube 15 exit pipes, medium temperature is higher than setting value, should turn the aperture of oil refinery dry gas sluice valve 12 down, reduce gas supply amount, reduce the aperture of oxygen-enriched air pipe butterfly valve 4 and the power of air blast 1 simultaneously, not too high to maintain in the stable and flue gas of flame profile oxygen content.Air blast 1 is sent into static mixer 6 by air by air channel 2.In the time that in radiating furnace tube 15 exit pipes, medium temperature is lower than setting value, should increase the aperture of oil refinery dry gas sluice valve 12, increase gas supply amount, increase aperture and air blast 1 power of oxygen-enriched air pipe butterfly valve simultaneously, not too low to maintain in the stable and flue gas of flame profile oxygen content, ensure the completing combustion of oil refinery dry gas.For another example, when the oxygen concentration that records when zirconia oxygen concentration sensor is too high, should reduce the aperture of oxygen-enriched air pipe butterfly valve 4 and the power of air blast 1, check whether high efficency low NOx oxygen rich fuel gas burner 13 and tubular heater 14 exist leaks out simultaneously, 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% when air, flow 1800kg/h, oxygen purity 25% when low concentration oxygen enrichment, flow 1512kg/h, during with air compared with reduce 16%.The pressure of oil refinery dry gas before high efficency low NOx oxygen rich fuel gas burner 13 is 120kPa (gauge pressure), air or the combustion-supporting oxidant pressure before high efficency low NOx oxygen rich fuel gas burner 13 is 100Pa (gauge pressure), air or the combustion-supporting oxidant preheat temperature 373K before high efficency low NOx oxygen rich fuel gas burner 13.
Table 1
Burning result shows, when using air as combustion-supporting oxidant, the intrafascicular air velocity of average rate speedup array tube is 21m/s, in flue gas, contain 72.45% nitrogen, 1.05% oxygen, 16.84% water, 9.73% carbon dioxide, in flue gas, carbon monoxide content is less than 50ppm, and the concentration of nitrogen oxides in effluent is 67.0mg/Nm 3(@3%O 2dry flue gas).
Burning result shows, when in combustion-supporting oxidant, contain 25% volume fraction oxygen time, the intrafascicular flow velocity of average rate speedup array tube is 17m/s, in flue gas, contain 67.69% nitrogen, 1.11% oxygen, 19.80% water, 11.4% carbon dioxide, in flue gas, carbon monoxide content is less than 50ppm, and the concentration of nitrogen oxides in effluent is 172.9mg/Nm 3(@3%O 2dry flue gas), lower than standard value 240mg/Nm 3(GB16297-1996 discharge standard of air pollutants).
Burning result shows, high efficency low NOx tubular heater low concentration oxygen-enriched combustion system of the present invention and burner, ensure oil refinery dry gas burning completely, pollutant emission is lower than national standard, make combustion-supporting oxidant compared with air with oxygen-enriched air, improve carbon dioxide in flue gas concentration, the subsequent captured that is conducive to carbon dioxide with separate.
When Fig. 4 represents to do combustion gas with the present embodiment oil refinery dry gas, under the different oxygen concentrations of combustion-supporting oxidant, 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, and the load of air blast, air-introduced machine reduces, and power consumption reduces.
Air of the present invention fully mixes in static mixer with oxygen-enriched air, heated in air preheater, jointly inject radiation chamber by burner with combustion gas, the burning of mixing limit, limit, medium in heating radiating furnace tube and convection coil, flue-gas temperature reduces through air preheater, enters chimney by air-introduced machine; 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, the growing amount of NOx while suppressing oxygen-enriched combusting.The present invention has reduced the combustion-supporting oxidant quantity delivered of tubular heater and flue gas volume, has reduced air blast and air-introduced machine power consumption, has improved CO in flue gas 2concentration, reduces CO 2catch and the cost separating, effectively suppressed 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 make some improvements and modifications, these improvements and modifications also should be considered within the scope of protection of the present invention.

Claims (10)

1. a high efficency low NOx tubular heater low concentration oxygen-enriched combustion system, it is characterized in that, oxygen-enriched air fully mixes in static mixer with air, through air preheater preheating, with the oil refinery dry gas from refinery's pipe network, inject the radiation chamber of tubular heater through burner, in the burning of radiation chamber inner edge mixing limit, the medium in heat heating radiating furnace tube and convection coil that burning discharges, flue gas is cooling through air preheater, send into chimney by air-introduced machine, NOx is nitrogen oxide.
2. a kind of high efficency low NOx tubular heater low concentration oxygen-enriched combustion system as claimed in claim 1, is characterized in that, described oxygen-enriched air is by film oxygen enriching device, and Oxygen-Rich Gas by PSA or cryogenic air separation unit oxygenerator provide;
Described air preheater is heat pipe preheater, the one in 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 characterized in that, the mist forming after described oxygen-enriched air fully mixes in static mixer with air is called combustion-supporting oxidant, and the 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, is characterized in that, zirconia oxygen concentration sensor is equipped with in described tubular heater radiation chamber exit.
5. a kind of high efficency low NOx tubular heater low concentration oxygen-enriched combustion system as claimed in claim 1, is characterized in that, ultrasonic wave oxygen concentration sensor is all installed before and after described static mixer.
6. a high efficency low NOx oxygen rich fuel gas burner, it is by cylindrical shell, 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 form; It is characterized in that, air inlet is welded on cylindrical shell side, the mode that average rate speed increaser connects by welding or rivet is fixed on inner barrel, silencer wall is tightly riveted on cylinder inboard wall, has fire hole and flame-observing hole, altar lamp on cylinder bottom plate, 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 cylindrical shell top, and classification gas gun is through the hole of opening on brazier brick.
7. a kind of high efficency low NOx oxygen rich fuel gas burner as claimed in claim 6, is characterized in that, high efficency low NOx oxygen rich fuel gas burner classification gas gun gas flow accounts for 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, is characterized in that, on the gas gun of high efficency low NOx oxygen rich fuel gas burner center, 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, is characterized in that, high efficency low NOx oxygen rich fuel gas burner fire pot brick is monoblock type or sectional type, and on brazier brick, leaves the installing hole of classification gas gun.
10. a kind of high efficency low NOx oxygen rich fuel gas burner as claimed in claim 6, it is characterized in that, the intrafascicular oxidant flow velocity of the combustion-supporting oxidant average rate of high efficency low NOx oxygen rich fuel gas burner speedup array tube 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 the mode that upper lower perforated plate connects by welding or rivet is fixed on burner cylindrical shell.
CN201410352992.4A 2014-07-23 2014-07-23 A kind of high efficency low NOx tubular heater low concentration oxygen-enriched combustion system and burner CN104121581B (en)

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CN107620957A (en) * 2017-08-30 2018-01-23 昆明理工大学 A kind of industrial furnace high-efficient atomizing combustion system and its method based on high viscosity biomass fuel

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