CN214406048U - Low oxygen type water-cooling ultralow nitrogen water-cooling combustor - Google Patents
Low oxygen type water-cooling ultralow nitrogen water-cooling combustor Download PDFInfo
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- CN214406048U CN214406048U CN202120554284.4U CN202120554284U CN214406048U CN 214406048 U CN214406048 U CN 214406048U CN 202120554284 U CN202120554284 U CN 202120554284U CN 214406048 U CN214406048 U CN 214406048U
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Abstract
The utility model discloses a low-oxygen water-cooling ultra-low nitrogen water-cooling burner, which comprises a blower, a gas mixing device and a water-cooling burning head;the water-cooled combustion head comprises a shell, an upper collecting box and a lower collecting box, wherein an air distribution cavity is arranged in the shell and is communicated with an outlet of a blower, and a porous air distribution plate is arranged in the air distribution cavity; the upper collecting box and the lower collecting box are respectively arranged at the upper end and the lower end of the shell, and the fire grate and the flame stabilizing pipe which are vertically arranged side by side are arranged between the upper collecting box and the lower collecting box; meanwhile, the flame is stable in combustion, and the phenomena of backfire, deflagration, blockage, flameout and the like can not occur. Especially under the condition of low excess air coefficient (for example, the oxygen content in the smoke is less than 2.5 percent), the discharge amount of nitrogen oxide reaches 30mg/m3And the emission of NOx is greatly reduced while the combustion efficiency is improved.
Description
Technical Field
The utility model relates to a combustor field technique especially indicates a hypoxemia type water-cooling ultra-low nitrogen water-cooling combustor.
Background
The nitrogen oxide is generated by the combustion of a gas boiler, the nitrogen oxide harms the atmospheric environment and generates haze, and the new standard requires that the emission of the nitrogen oxide of the boiler does not exceed 30mg/m3. The discharge of nitrogen oxides is mainly determined by the burner matched with the boiler. The low-nitrogen burners which can meet the requirements in the current market are two types, the first type is a flue gas recirculation low-nitrogen burner, the burners are mainly produced by European and American burner manufacturers and are expensive, and the heat efficiency of a boiler is reduced because non-combustible flue gas is increased in the boiler and a larger hearth combustion space is needed; the other is a low-nitrogen burner burning on the surface of a metal net, the metal net of the burner has a plurality of tiny pores, and after the burner is used for a period of time, impurities in the air block the pores and need to be cleaned regularly.
For the combustion proposed by patent CN201720848220 'A Water-cooled finned tube fire-discharging full-premix low-nitrogen burner', the problem of tempering is solved by the water-cooled finned tube, because the flame is not fully cooled, the overall temperature of the flame is higher, local high temperature is difficult to avoid, and only when the oxygen content in the flue gas reaches more than 6%, the NOx in the tail flue gas can be ensured to be lower than 30mg/m3。
Patent CN201720848220 discloses a water-cooled finned tube fire grate full premix low-nitrogen burner, which solves the problems of flame extinguishing and tempering prevention by absorbing heat through water cooling and reducing the flame temperature only through water cooling during flame tempering. But does not address the problem of ultra-low nitrogen combustion of natural gas under low oxygen conditions. The integral temperature of the flame is higher only by cooling water at the root of the flame, local high temperature is difficult to avoid, and NOx in tail smoke can be ensured to be lower than 30mg/m only when the oxygen content in the smoke reaches more than 6 percent3。
Therefore, there is a need to develop a solution to the above problems.
SUMMERY OF THE UTILITY MODEL
In view of the above, the present invention is directed to a low-oxygen water-cooled ultra-low-nitrogen water-cooled burner, which can effectively solve the problem of NOx emission below 30mg/m after natural gas combustion3And solves the problem that the NOx of a part of water-cooled combustors can be lower than 30mg/m only when the air is high in excess (the air content in tail flue gas is higher than 6 percent)3To a problem of (a).
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a low-oxygen water-cooling ultra-low nitrogen water-cooling burner comprises a blower, a gas mixing device and a water-cooling burner head; the gas mixing device is arranged at the inlet of the blower and is provided with an air inlet and a fuel gas inlet; the water-cooled combustion head comprises a shell, an upper collecting box and a lower collecting box, wherein an air distribution cavity is arranged in the shell and is communicated with an outlet of a blower, and a porous air distribution plate is arranged in the air distribution cavity; this go up collection case and lower collection case and set up respectively in the upper and lower both ends of shell, go up vertical fire grate and steady flame pipe that sets up side by side about being equipped with between collection case and the lower collection case, the both sides of fire grate and steady flame pipe are equipped with communicating pipe, and the fire grate is located between porous grid plate and the steady flame pipe, the inside cavity of fire grate, steady flame pipe, communicating pipe just with last collection case and lower collection case intercommunication.
Preferably, the communicating pipe is provided with an ignition device, a fire observation hole and a flame detector.
Preferably, a water inlet is formed in the lower header, and a water outlet is formed in the upper header.
Preferably, the fire grate is composed of vertically arranged special-shaped spiral finned tubes, and gaps are formed between the adjacent special-shaped spiral finned tubes.
Preferably, the flame stabilizing pipes are vertically arranged in parallel, the flame stabilizing pipes are arranged in parallel with the fire grate and are arranged in front of the fire grate, and the flame stabilizing pipes are aligned with the top end of the special-shaped spiral finned tube.
Preferably, the fire row is provided with one row, the flame stabilizing pipes are provided with one row, and a space for flame combustion is enclosed between the flame stabilizing pipes and the communicating pipes.
Preferably, the air blower is a variable frequency fan.
Preferably, an air filter is arranged at the air inlet, and a gas valve group is arranged at the gas inlet.
Compared with the prior art, the utility model obvious advantage and beneficial effect have, particularly, can know by above-mentioned technical scheme:
the product adopts a full premix combustion mode, and cooling water in the fire grate and the flame stabilizing pipe can quickly take away heat, so that the flame temperature is effectively reduced, and the generation of harmful gas is reduced; meanwhile, the flame is stable in combustion, and the phenomena of backfire, deflagration, blockage, flameout and the like can not occur. Especially under the condition of low excess air coefficient (for example, the oxygen content in the smoke is less than 2.5 percent), the discharge amount of nitrogen oxide reaches 30mg/m3And the emission of NOx is greatly reduced while the combustion efficiency is improved.
To more clearly illustrate the structural features and functions of the present invention, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments:
drawings
FIG. 1 is a front view of a preferred embodiment of the present invention;
FIG. 2 is a top view of the preferred embodiment of the present invention;
fig. 3 is a side view of the preferred embodiment of the present invention;
FIG. 4 is a partial cross-sectional view of a water-cooled burner head in accordance with a preferred embodiment of the present invention;
fig. 5 is a partially enlarged view of the porous air distribution plate according to the preferred embodiment of the present invention.
The attached drawings indicate the following:
10. blower 20 and gas mixing device
21. Air inlet 22 and gas inlet
30. Water-cooled burner head 31, shell
32. Upper header 33 and lower header
34. Porous gas distribution plate 35 and fire grate
351. Special-shaped spiral finned tube 352 and T-shaped plate
36. Flame stabilizing pipe 37 and communicating pipe
301. Air distribution cavity 302 and water inlet
303. Water outlet 304, channel
305. Ignition device 306, fire observation hole
307. Flame detector 41 and air filter
42. Gas valve group
Detailed Description
Referring to fig. 1 to 5, the detailed structure of the preferred embodiment of the present invention is shown, which includes a blower 10, a gas mixing device 20 and a water-cooled burner head 30.
The gas mixing device 20 is arranged at the inlet of the blower 10, the gas mixing device 20 is provided with an air inlet 21 and a gas inlet 22, the gas mixing device 20 is used for mixing air and gas, in the embodiment, an air filter 41 is arranged at the air inlet 21, and a gas valve group 42 is arranged at the gas inlet 22; this air-blower 10 is the frequency conversion fan, through the gas flow with every burning load of matching of gas valves 42 can the accurate control to reach the purpose that improves combustion efficiency, and, this gas mixing device 20 sets up in the import department of air-blower 10, can satisfy at the full load work of combustor under lower air feed pressure, and because the secondary stirring mixed action of air-blower 10, the mixture of gas and air will be more even, and the burning is more abundant.
The water-cooled burner head 30 comprises a shell 31, an upper header 32 and a lower header 33, wherein an air distribution cavity 301 is arranged in the shell 31, the air distribution cavity 301 is communicated with an outlet of the air blower 10, and a porous air distribution plate 34 is arranged in the air distribution cavity 301; this go up collection case 32 and lower collection case 33 and set up respectively in the upper and lower both ends of shell 31, go up collection case 32 and be equipped with vertical fire row 35 and the flame stabilizing pipe 36 that set up side by side about being equipped with between collection case 33, the both sides of fire row 35 and flame stabilizing pipe 36 are equipped with communicating pipe 37, and fire row 35 is located between porous grid plate 34 and the flame stabilizing pipe 36, the inside cavity of fire row 35, flame stabilizing pipe 36, communicating pipe 37 just communicates with last collection case 32 and lower collection case 33.
In this embodiment, the lower header 33 has a water inlet 302 therein, and the upper header 32 has a water outlet 303 therein. The fire grate 35 is composed of vertically arranged special-shaped spiral finned tubes 351, gaps are formed between the adjacent special-shaped spiral finned tubes 351, T-shaped plates 352 are arranged between the special-shaped spiral finned tubes 351, the special-shaped spiral finned tubes 351 are octagonal inverted fin-shaped tubes, a plurality of narrow channels 304 are formed between the inverted fins and the adjacent fins and between the adjacent fins and the tube walls, wherein the edges close to the porous gas distribution plate 34 and the edges corresponding to the edges are arc-shaped; the flame stabilizing pipes 36 are vertically arranged in parallel, the flame stabilizing pipes 36 are arranged in parallel with the fire grate 35, the flame stabilizing pipes 36 are arranged in front of the fire grate 35, and the flame stabilizing pipes 36 are aligned with the top ends of the special-shaped spiral finned tubes 351; moreover, the fire row 35 is provided with a row, the flame stabilizing pipes 36 are provided with a row, and a space for flame combustion is enclosed between the flame stabilizing pipes 36 and the communicating pipe 37; the communicating pipe 37 is provided with an ignition device 305, a fire observation hole 306 and a flame detector 307, the communicating pipe 37 plays a role of supporting and fixing on one hand, and plays a role of preventing flame from radiating and transferring heat to two sides on the other hand, and cooling water is introduced into the communicating pipe 37 for reducing the temperature of the flame.
Detailed description the working principle of the present embodiment is as follows:
during operation, this air-blower 10 is used for carrying the mist, and in entering water-cooling combustion head 30 after the even benefit of gas distribution chamber 301, in the combustion process, the cooling water in fire row 35 and the flame stabilizing pipe 36 can take away the temperature, reduces the flame temperature, effectively reduces nitrogen oxide's production. When the flame stabilizing pipe 36 works, the flame stabilizing pipe is equivalent to a blunt body for gas flowing, so that after combustion gas passes through a round pipe, negative pressure is formed on the back surface of the round pipe, new unburned gas is re-combusted, and the combustion can be continuously carried out. Due to the resistance of the narrow slit in the fire grate 35, the pressure of the gas after the gas exits the narrow slit is reduced, so that the pressure of a combustion area is lower than that of the constant-pressure cavity, and the tempering is not easy to generate; the premixed gas has fast burning speed, blue color and short flame length, generally not more than 150 mm.
The utility modelThe novel design key points are as follows: the product adopts a full premix combustion mode, and cooling water in the fire grate and the flame stabilizing pipe can quickly take away heat, so that the flame temperature is effectively reduced, and the generation of harmful gas is reduced; meanwhile, the flame is stable in combustion, and the phenomena of backfire, deflagration, blockage, flameout and the like can not occur. Especially under the condition of low excess air coefficient (for example, the oxygen content in the smoke is less than 2.5 percent), the discharge amount of nitrogen oxide reaches 30mg/m3And the emission of NOx is greatly reduced while the combustion efficiency is improved.
The technical principle of the present invention is described above with reference to specific embodiments. The description is made for the purpose of illustrating the principles of the invention and should not be construed in any way as limiting the scope of the invention. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without any inventive effort, which would fall within the scope of the present invention.
Claims (8)
1. The utility model provides a low oxygen type water-cooling ultralow nitrogen water-cooling combustor which characterized in that: comprises a blower, a gas mixing device and a water-cooled combustion head; the gas mixing device is arranged at the inlet of the blower and is provided with an air inlet and a fuel gas inlet; the water-cooled combustion head comprises a shell, an upper collecting box and a lower collecting box, wherein an air distribution cavity is arranged in the shell and is communicated with an outlet of a blower, and a porous air distribution plate is arranged in the air distribution cavity; this go up collection case and lower collection case and set up respectively in the upper and lower both ends of shell, go up vertical fire grate and steady flame pipe that sets up side by side about being equipped with between collection case and the lower collection case, the both sides of fire grate and steady flame pipe are equipped with communicating pipe, and the fire grate is located between porous grid plate and the steady flame pipe, the inside cavity of fire grate, steady flame pipe, communicating pipe just with last collection case and lower collection case intercommunication.
2. The low oxygen type water-cooled ultra-low nitrogen water-cooled burner of claim 1, wherein: the communicating pipe is provided with an ignition device, a fire observation hole and a flame detector.
3. The low oxygen type water-cooled ultra-low nitrogen water-cooled burner of claim 1, wherein: the lower header is provided with a water inlet, and the upper header is provided with a water outlet.
4. The low oxygen type water-cooled ultra-low nitrogen water-cooled burner of claim 1, wherein: the fire row is composed of vertically arranged special-shaped spiral finned tubes, and gaps are formed between the adjacent special-shaped spiral finned tubes.
5. The low oxygen type water-cooled ultra-low nitrogen water-cooled burner of claim 4, wherein: the flame stabilizing pipes are vertically arranged in parallel, the flame stabilizing pipes are arranged in parallel with the fire grate and are arranged in front of the fire grate, and the flame stabilizing pipes are aligned with the top end of the special-shaped spiral finned tube.
6. A low oxygen type water-cooled ultra-low nitrogen water-cooled burner as claimed in claim 4 or 5, wherein: the fire row is provided with one row, the flame stabilizing pipe is provided with one row, and a space for flame combustion is enclosed between the flame stabilizing pipe and the communicating pipe.
7. The low oxygen type water-cooled ultra-low nitrogen water-cooled burner of claim 1, wherein: the air blower is a variable frequency fan.
8. The low oxygen type water-cooled ultra-low nitrogen water-cooled burner of claim 1, wherein: an air filter is arranged at the air inlet, and a gas valve group is arranged at the gas inlet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120554284.4U CN214406048U (en) | 2021-03-18 | 2021-03-18 | Low oxygen type water-cooling ultralow nitrogen water-cooling combustor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120554284.4U CN214406048U (en) | 2021-03-18 | 2021-03-18 | Low oxygen type water-cooling ultralow nitrogen water-cooling combustor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214406048U true CN214406048U (en) | 2021-10-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120554284.4U Active CN214406048U (en) | 2021-03-18 | 2021-03-18 | Low oxygen type water-cooling ultralow nitrogen water-cooling combustor |
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| Country | Link |
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| CN (1) | CN214406048U (en) |
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2021
- 2021-03-18 CN CN202120554284.4U patent/CN214406048U/en active Active
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