CN211694881U - Low-nitrogen gas burner - Google Patents
Low-nitrogen gas burner Download PDFInfo
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- CN211694881U CN211694881U CN202020139987.6U CN202020139987U CN211694881U CN 211694881 U CN211694881 U CN 211694881U CN 202020139987 U CN202020139987 U CN 202020139987U CN 211694881 U CN211694881 U CN 211694881U
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Abstract
The utility model provides a can reduce NOx's low-nitrogen gas burner who produces by a wide margin, it adopts technologies such as burning classification, subregion air feed to make the nitrogen oxide concentration in the exhaust flue gas lower, simple structure, convenient operation, low energy-conservation consume. The air conditioner comprises a shell with an air channel inside and an air outlet pipe; the front part in the air outlet pipe is provided with a tapered air guide ring with a small front part and a big back part, and an annular baffle is arranged between the inner periphery of the air outlet pipe and the outer periphery of the air guide ring; the front ends of the inner ring air pipes positioned on the same circumference are provided with inner ring air nozzles and are positioned in the air guide ring; a plurality of combustion cylinders positioned on the same circumference penetrate through the baffle; the front end of each outer annular air pipe is provided with an outer annular air nozzle and penetrates through a combustion cylinder; the rear end of the inner ring air pipe is communicated with an inner ring air distribution cavity in the inner ring air distribution disc, the rear end of the outer ring air pipe is communicated with an outer ring air distribution cavity in the outer ring air distribution disc, the inner ring air distribution cavity and the outer ring air distribution cavity are communicated with a gas source through gas supply pipelines, and each gas supply pipeline is provided with a gas regulating valve.
Description
Technical Field
This patent relates to a low nitrogen gas burner.
Background
6 and 7 days in 2018, the environmental protection agency of Shanghai City and the quality and technology supervision agency of Shanghai City printed the emission standard DB31/387 2018 boiler atmospheric pollutant emission standard of local pollutants of Shanghai City, and the emission of nitrogen oxides is controlled below 50 mg/cubic meter when a natural gas boiler is newly built, and the standard is implemented from 6 and 7 days in 2018. At present, the scale distribution condition of the Shanghai boiler is as follows: there are 1887 boilers of 1 ton, 2465 boilers of 1 ton-4 ton (inclusive), 780 boilers of 4 ton or more, most of which NOXThe discharge mass concentration is 120mg/m3－200mg/m3And the standard of nitrogen oxide emission control below 50 mg/cubic meter is greatly different.
Currently, the low-nitrogen technology is commonly used for reducing the emission of nitrogen oxides by using a flue gas external circulation technology.
When the smoke circulation function is adopted to reduce the Nox value in the smoke, a certain proportion of smoke needs to be supplied for the combustion process, so that the flame temperature is reduced, and the Nox value is reduced. Therefore, the flue gas at the tail part of the boiler is usually introduced into the whole air inlet path through a fan, and the heavy sample is put into a combustor for combustion, so that the maximum power of the combustor is limited. That is, the maximum amount of combustion air that can be supplied is reduced. The fuel supply in the rated load range must therefore be reduced in order to obtain the correct combustion value. If the power of the burner is not reduced, the main burner, the blower and the air blowing duct are increased, so that the power of the blower is increased. Meanwhile, the surface temperature of the flame is reduced by adding the flue gas, and the increased flue gas can absorb the temperature of the flame, so that the heat efficiency of the boiler is influenced.
Disclosure of Invention
The low-nitrogen gas burner can greatly reduce NOx generation, adopts technologies of combustion classification, zone air supply and the like to enable the concentration of nitrogen oxides in discharged flue gas to be low, has a simple structure, is convenient to operate, has low consumption and energy conservation, and is particularly suitable for small boilers of 4 tons or below.
The low-nitrogen gas burner comprises a shell with an air channel inside, wherein an inlet of the air channel is communicated with an outlet of an air blower, and an air outlet pipe is communicated with the air channel; the front part in the air outlet pipe is provided with a tapered air guide ring with a small front part and a big back part, and an annular baffle is arranged between the inner periphery of the air outlet pipe and the outer periphery of the air guide ring; the front ends of the inner ring air pipes positioned on the same circumference are provided with inner ring air nozzles and are positioned in the air guide ring; a plurality of combustion cylinders positioned on the same circumference penetrate through the baffle; the front end of each outer annular air pipe is provided with an outer annular air nozzle and penetrates through a combustion cylinder; the rear end of the inner ring air pipe is communicated with an inner ring air distribution cavity in the inner ring air distribution disc, the rear end of the outer ring air pipe is communicated with an outer ring air distribution cavity in the outer ring air distribution disc, the inner ring air distribution cavity and the outer ring air distribution cavity are communicated with a gas source through gas supply pipelines, and each gas supply pipeline is provided with a gas regulating valve.
The low-nitrogen gas burner also comprises a flame stabilizing disc with a through hole, each inner annular gas pipe penetrates through the flame stabilizing disc, an inner annular gas nozzle is positioned at the front part of the flame stabilizing disc in the axial direction of the gas outlet pipe, and the outer periphery of the flame stabilizing disc is provided with an inner cylinder positioned in the air guide ring.
In the low-nitrogen gas burner, the air distribution cylinder is arranged in the air outlet pipe, and the annular space in the air distribution cylinder is divided into the front inner annular air distribution cavity and the rear outer annular air distribution cavity.
In the low-nitrogen gas burner, the cross section of the combustion cylinder is u-shaped.
In the low-nitrogen gas burner, the front end surface of the outer annular gas pipe is an inclined surface facing the axis of the air outlet pipe, and the inclined surface is provided with a plurality of outer annular gas pipe air outlets serving as outer annular gas nozzles.
In the low-nitrogen gas burner, the front end of the inner ring gas pipe is circumferentially provided with a plurality of inner ring gas pipe gas outlets serving as inner ring gas nozzles.
The air faucet comprises an inner ring air faucet and an outer ring air faucet which are arranged in an air outlet pipe, a flame stabilizing disc is arranged at the front end of the inner ring air faucet, a combustion cylinder is arranged around the outer ring air faucet, an air guide ring is arranged between the combustion cylinder and the inner ring air faucet, a conical flow guide channel is arranged in the air guide ring, and combustion-supporting air is ejected out from the conical flow guide channel at a high speed to separate the flame into inner ring flame and outer ring flame. Because the inner ring flame is generated by combustion after the inner ring fuel is mixed with air, the inner ring air flow is small, so that the fuel cannot be combusted, the flame temperature is low, and NOx is rarely generated; the outer ring gas ejected by the outer ring gas nozzle of the outer flame is combusted in a self-jet diffusion mode, so that a large amount of free flame is generated in a furnace chamber (a boiler) at the front part of the low-nitrogen gas combustor, the flame is yellow, weak and weak, and the temperature is low; the combustion cylinder uses the gas jet velocity to suck and roll the cooling smoke around to reduce the temperature of the hydrocarbon compounds burnt at the outer ring, thereby greatly reducing the generation of NOx and CO.
The inner ring air distribution plate and the outer ring air distribution plate are combined into a whole and arranged in the air outlet pipe, so that the structure is further simplified.
The front end face of the outer ring air pipe is an inclined plane facing the axis of the air outlet pipe and matched with the conical air guide ring with a small front part and a large rear part, so that the effect of sucking and rolling the outer ring gas burning flame sprayed from the outer ring air nozzle to cool the smoke around is better.
The gas regulating valve is divided into an inner ring gas regulating valve and an outer ring gas regulating valve, the inner ring gas regulating valve is controlled by an inner ring gas servo motor, the outer ring gas regulating valve is controlled by an outer ring gas servo motor, the inner ring gas is sprayed out to the inner ring gas distribution cavity, the inner ring gas pipe and the inner ring gas nozzle through the inner ring gas regulating valve, and the outer ring gas is sprayed out to the outer ring gas distribution cavity, the outer ring gas pipe and the outer ring gas nozzle through the outer ring gas regulating valve and finally mixed with oxygen to be combusted. An air adjusting valve is arranged at the inlet of the air channel and is controlled by an air servo motor.
The air regulating valve controls the opening degree of the air regulating valve through an air servo motor, and the air servo motor is provided with air servo motor feedback; the inner ring gas servo motor is provided with gas servo motor feedback; and the outer ring gas servo motor is provided with outer ring gas servo motor feedback. The air servo motor, the air servo motor feedback, the inner ring gas servo motor feedback, the outer ring gas servo motor and the outer ring gas servo motor feedback are all connected with the controller. The controller controls the inner ring gas servo motor, the outer ring gas servo motor and the air servo motor to act, and the opening of the inner ring gas regulating valve, the outer ring gas regulating valve and the air regulating valve is regulated, so that automatic control is realized.
The low-nitrogen gas burner also comprises an ignition device and the like.
In a word, this patent provides an integral type low nitrogen gas combustor that nitrogen oxide emission concentration is ultralow, adopts technologies such as strong burning classification, subregion air feed to make the nitrogen oxide in the exhaust flue gas reach 50mg/m3The device adjusts the air and gas quantity in real time through the air adjusting valve and the gas adjusting valve, and has the advantages of convenience in installation, intelligent control, simplicity in operation, convenience in maintenance, long service life of parts, low energy consumption, energy conservation and low nitrogen emission.
Drawings
FIG. 1 is an overall view of a low-nitrogen gas burner;
FIG. 2 is an internal structural view of the low-nitrogen gas burner;
FIG. 3 is a structural view of a conical air guide ring, an air distribution cylinder and the like;
FIG. 4 is a structural view of an air outlet pipe, a combustion cylinder, etc.;
fig. 5 is a structural view of the inner ring air nozzle, the outer ring air nozzle, and the like.
Detailed Description
Referring to fig. 1, the low-nitrogen gas burner comprises a shell 2 with an air channel 1 inside, wherein the inlet of the air channel is communicated with the outlet of a blower 3, and an air outlet pipe 4 is communicated with the air channel; a conical air guide ring 5 with a small front part and a big back part is arranged at the front part in the air outlet pipe, and an annular baffle 6 is arranged between the inner periphery of the air outlet pipe and the outer periphery of the air guide ring; the front end of the 4 inner ring air pipes 7 positioned on the same circumference is provided with a plurality of inner ring air pipe air outlets as inner ring air nozzles 8 in the circumferential direction. Each inner ring air pipe passes through a flame stabilizing disc 9 with a through hole, an inner ring air nozzle is positioned at the front part of the flame stabilizing disc in the axial direction of the air outlet pipe, and the periphery of the flame stabilizing disc is arranged in an inner cylinder 10 positioned in the air guide ring.
6 combustion cylinders 11 with u-shaped cross sections and located on the same circumference penetrate the baffle. The front end faces of the 6 outer air pipes 12 are inclined planes 121 facing the axis of the air outlet pipe, and the inclined planes are provided with a plurality of outer air pipe air outlets serving as outer air nozzles 122. Each outer annular air pipe passes through one combustion cylinder.
An air distribution cylinder 13 is provided in the air outlet pipe, and an annular space in the air distribution cylinder is partitioned into a front inner annular air distribution chamber 131 and a rear outer annular air distribution chamber 132. The rear end of the inner ring air pipe 7 is communicated with an inner ring air distribution chamber 131, the rear end of the outer ring air pipe 12 is communicated with an outer ring air distribution chamber 132, the inner ring air distribution chamber and the outer ring air distribution chamber are respectively communicated with a gas source through gas supply pipelines 141 and 142, and each gas supply pipeline is provided with a gas regulating valve.
The low nitrogen nozzle comprises an inner ring air nozzle and an outer ring air nozzle which are arranged in the shell, the front end of the inner ring air nozzle is provided with a flame stabilizing disc, each outer ring air nozzle is provided with a semicircular combustion cylinder at the periphery, a conical flow guide channel is arranged between the combustion cylinder and the inner ring air nozzle, combustion-supporting air is ejected from the conical flow guide channel at a high speed to separate the flame into inner ring flame and outer ring flame, and the inner ring flame is generated by combustion after inner ring fuel is mixed with air, so that the inner ring air flow is small, the fuel is not combusted, the flame temperature is low, and NOx is rarely generated; the outer flame is ejected from the outer ring air nozzle and is combusted in a self-jet diffusion mode, so that a large amount of free flame is generated in a boiler hearth, the flame is yellow, weak and low in temperature, and finally the semicircular combustion cylinder absorbs and winds cooling smoke around by utilizing the jet velocity of mixed gas to reduce the temperature of hydrocarbon compounds combusted in the outer ring, and the generation of NOx and CO is greatly reduced.
Claims (6)
1. The low-nitrogen gas burner comprises a shell with an air channel inside, wherein the inlet of the air channel is communicated with the outlet of the blower, and the air outlet pipe is communicated with the air channel; the method is characterized in that: the front part in the air outlet pipe is provided with a tapered air guide ring with a small front part and a big back part, and an annular baffle is arranged between the inner periphery of the air outlet pipe and the outer periphery of the air guide ring; the front ends of the inner ring air pipes positioned on the same circumference are provided with inner ring air nozzles and are positioned in the air guide ring; a plurality of combustion cylinders positioned on the same circumference penetrate through the baffle; the front end of each outer annular air pipe is provided with an outer annular air nozzle and penetrates through a combustion cylinder; the rear end of the inner ring air pipe is communicated with an inner ring air distribution cavity in the inner ring air distribution disc, the rear end of the outer ring air pipe is communicated with an outer ring air distribution cavity in the outer ring air distribution disc,
the inner ring air distribution cavity and the outer ring air distribution cavity are communicated with a gas source through gas supply pipelines, and each gas supply pipeline is provided with a gas regulating valve.
2. The low-nitrogen gas burner as set forth in claim 1, wherein: the flame stabilizing disc is provided with a through hole, each inner annular air pipe penetrates through the flame stabilizing disc, an inner annular air nozzle is positioned at the front part of the flame stabilizing disc in the axial direction of the air outlet pipe, and an inner cylinder positioned in the air guide ring is arranged on the periphery of the flame stabilizing disc.
3. The low-nitrogen gas burner as set forth in claim 1, wherein: an air distribution cylinder is arranged in the air outlet pipe, and an annular space in the air distribution cylinder is divided into an inner annular air distribution cavity at the front part and an outer annular air distribution cavity at the rear part.
4. The low-nitrogen gas burner as set forth in claim 1, wherein: the cross section of the combustion cylinder is u-shaped.
5. The low-nitrogen gas burner as set forth in claim 1, wherein: the front end surface of the outer air pipe is an inclined surface facing the axis of the air outlet pipe, and a plurality of outer air pipe air outlets serving as outer air nozzles are formed in the inclined surface.
6. The low-nitrogen gas burner as set forth in claim 1, wherein: the front end of the inner ring air pipe is provided with a plurality of inner ring air pipe air outlets as inner ring air nozzles in the circumferential direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020139987.6U CN211694881U (en) | 2020-01-21 | 2020-01-21 | Low-nitrogen gas burner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020139987.6U CN211694881U (en) | 2020-01-21 | 2020-01-21 | Low-nitrogen gas burner |
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| Publication Number | Publication Date |
|---|---|
| CN211694881U true CN211694881U (en) | 2020-10-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020139987.6U Active CN211694881U (en) | 2020-01-21 | 2020-01-21 | Low-nitrogen gas burner |
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| CN (1) | CN211694881U (en) |
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