CN110469848B - Flue gas circulation ultralow nitrogen combustion device - Google Patents
Flue gas circulation ultralow nitrogen combustion device Download PDFInfo
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- CN110469848B CN110469848B CN201910856512.0A CN201910856512A CN110469848B CN 110469848 B CN110469848 B CN 110469848B CN 201910856512 A CN201910856512 A CN 201910856512A CN 110469848 B CN110469848 B CN 110469848B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/02—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details
- F23D14/60—Devices for simultaneous control of gas and combustion air
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details
- F23D14/62—Mixing devices; Mixing tubes
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
Abstract
The invention provides a smoke circulation ultralow nitrogen combustion device which can burn combustible gas in industrial waste gas with low nitrogen oxides and effectively utilize generated heat, and the smoke circulation ultralow nitrogen combustion device comprises a shell and a flame tube, wherein a gas inlet, a circulating smoke inlet and an air inlet are arranged on the shell, a gas pipe and a circulating smoke pipe are arranged in the shell, the gas pipe is arranged at the outer side of the circulating smoke pipe, a gas channel is formed between the gas pipe and the circulating smoke pipe, an inner cavity of the circulating smoke pipe forms a smoke channel, a cavity between the shell, the flame pipe and the gas pipe forms an air channel, the gas pipe forms a gas cavity at the tail end and is connected with an internal combustion gas spray pipe, the circulating smoke pipe forms a smoke cavity at the tail end and is connected with an external smoke spray pipe, the internal combustion gas spray pipe is arranged in an external smoke spray pipe, the tail end of the internal combustion gas spray pipe is provided with a diffuser, the airflow sprayed from the flame pipe comprises an internal annular airflow, an annular airflow and an external annular airflow, and an ignition device is arranged in the shell.
Description
Technical Field
The invention belongs to the technical field of combustors, and particularly relates to a flue gas circulation ultralow nitrogen combustion device.
Background
At present, industrial waste gas discharged by many petrochemical enterprises contains combustible gas, and the industrial waste gas is directly discharged into the atmosphere, so that the environment is seriously polluted. Because these industrial waste gases contain combustible gases and a large amount of nitrogen, ammonia and the like, the combustible components of these gases are mostly hydrogen, carbon monoxide and the like, which are extremely easy to burn and extremely fast in burning speed, short in burning process, extremely concentrated in burning heat, and when a large amount of heat is generated by using a normal burning mode, nitrogen and the like are oxidized at high temperature in the burning process, a large amount of nitrogen oxides are contained in the flue gas, and the flue gas is directly discharged to cause serious pollution to the atmosphere. Therefore, a large amount of combustion technology of low nitrogen oxides in the furnace is adopted.
At present, most of the burners using such waste gas in the market adopt low-nitrogen burners for combusting natural gas, the nitrogen oxides far exceed the emission standard, many users are called out to stop or are modified for a limited period by the environmental protection department, if no new scientific combustion device or reasonable and more economical treatment method is adopted to realize the standard emission, the industrial waste gas containing the combustible gas is directly discharged or burnt, the environment is polluted, a large amount of available heat is wasted, and a large amount of flue gas and air are needed to be premixed for the used natural gas ultra-low nitrogen burner, so that the output and the efficiency of heat utilization equipment are greatly reduced.
Disclosure of Invention
Aiming at the problems, the invention provides the flue gas circulation ultralow nitrogen combustion device which can burn the combustible gas in the industrial waste gas with low nitrogen oxides, effectively utilize the generated heat, effectively realize comprehensive utilization of the industrial waste gas, and is more suitable for ultralow nitrogen oxide emission of standard-state fuel gases such as natural gas, city gas and the like, and has better effect.
The technical scheme is as follows: the utility model provides a flue gas circulation ultralow nitrogen burner, includes casing and flame tube, be provided with gas inlet, circulation flue gas inlet, air inlet on the casing respectively, its characterized in that: the gas pipe is coaxial with the circulating flue gas pipe and is arranged outside the circulating flue gas pipe, a cavity between the gas pipe and the circulating flue gas pipe forms a gas channel, an inner cavity of the circulating flue gas pipe forms a flue gas channel, the cavity between the shell, the flame pipe and the gas pipe forms an air channel, the gas pipe forms a gas cavity at the tail end and the circulating flue gas pipe forms a flue gas cavity at the tail end, the flue gas cavity is connected with a plurality of outer flue gas spray pipes, inner gas spray pipes which are coaxial with the outer flue gas spray pipes are respectively arranged in the outer flue gas spray pipes, the inner gas spray pipes are respectively communicated with the gas cavity, a diffuser is arranged at the extreme end of the inner gas spray pipes, the gas flow sprayed from the flame pipe outwards comprises an inner annular gas flow, an annular flue gas flow and an outer annular air flow respectively, and an ignition device is arranged in the shell.
Further, the tail end of the outer flue gas spray pipe is provided with a horn mouth.
Further, the length of the inner gas nozzle is longer than the outer gas nozzle such that the end of the inner gas nozzle and the diffuser extend beyond the outer gas nozzle.
Further, the diffuser is umbrella-shaped.
Further, air swirl teeth are arranged on the inner wall of the flame tube.
Further, the ignition device comprises an ignition tube arranged in the shell, one end of the ignition tube is communicated with the ignition gas inlet, the other end of the ignition tube extends into the flame tube and is provided with an ignition and pilot flame nozzle, and an automatic electronic ignition element is arranged at the position of the ignition and pilot flame nozzle.
Further, the gas pipe is connected with the gas inlet through a gas inlet pipe, the air inlet is connected with the air channel through an air inlet pipe, and the circulating smoke pipe is connected with the circulating smoke inlet through a circulating smoke inlet pipe.
Further, the circulating flue gas air inlet pipeline is provided with a circulating flue gas electric regulating valve, the air inlet pipeline is provided with an electric regulating air door, the fuel gas air inlet pipeline is provided with a fuel gas electric regulating valve, and the circulating flue gas electric regulating valve, the fuel gas electric regulating valve and the electric regulating air door are provided with any one of an electric actuator or a servo motor.
Further, the shell is provided with a mounting connection flange.
Further, an inspection door is arranged on the shell.
The smoke circulation ultralow-nitrogen combustion device disclosed by the invention can realize diffusion type lag extension of the combustion process by utilizing a small amount of circulation smoke to separate and diffuse and dilute the fuel gas and then mixing and combusting the fuel gas and air, reduce the temperature of a combustion center of the combustion, prevent nitrogen oxides from being generated, realize low-nitrogen environment-friendly emission, effectively utilize generated heat, comprehensively utilize a large amount of industrial waste gas, not only can reduce the production cost for enterprises, but also can respond to the national energy-saving emission-reducing circular economy requirements, can create great social and economic benefits, and is also more suitable for ultralow nitrogen oxide emission of standard fuel gases such as natural gas, urban gas and the like, and the effect is better.
Drawings
FIG. 1 is a schematic front view of a flue gas recirculation ultra-low nitrogen combustion device of the present invention;
FIG. 2 is a schematic side view of the flue gas recirculation ultra-low nitrogen combustion device of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
Referring to fig. 1 and 2, the invention relates to a smoke circulation ultralow nitrogen combustion device, which comprises a shell 1 and a flame tube 2, wherein a gas inlet 3, a circulation smoke inlet 4 and an air inlet 5 are respectively arranged on the shell 1, a gas pipe 6 and a circulation smoke pipe 7 which are communicated with the gas inlet 3 and the circulation smoke inlet 4 are respectively arranged in the shell, the gas pipe 6 and the circulation smoke pipe 7 are coaxially arranged, the gas pipe 6 is arranged outside the circulation smoke pipe 7, the diameter of the gas pipe 6 is larger than that of the circulation smoke pipe 7, a cavity between the gas pipe 6 and the circulation smoke pipe 7 forms a gas channel 8, an inner cavity of the circulation smoke pipe 7 forms a smoke channel 9, a cavity between the shell 1, the flame tube 2 and the gas pipe 6 forms an air channel 10, the gas pipe 7 forms a gas cavity 11 at the tail end and the circulation smoke pipe 7 forms a smoke cavity 12 at the tail end, the smoke cavity 12 is connected with a plurality of outer smoke spray pipes 13, the outer flue gas spray pipes 13 are respectively provided with an inner flue gas spray pipe 29 which is coaxially arranged with the outer flue gas spray pipes, the inner flue gas spray pipes 29 are respectively communicated with the flue gas cavity 11, the outer flue gas spray pipes 13 are respectively communicated with the flue gas cavity 12, the outer flue gas spray pipes 13 and the inner flue gas spray pipes 29 form one or more circles in the circumferential direction, in the embodiment, the outer flue gas spray pipes 13 and the inner flue gas spray pipes 29 are provided with 2 circles, the outer flue gas spray pipes 13 and the inner flue gas spray pipes 29 which are positioned at the inner circles are longer than the outer flue gas spray pipes 13 and the inner flue gas spray pipes 29 positioned at the outer circles, the extreme end of the inner flue gas spray pipes 12 is provided with a diffuser 14, the extreme end of the outer flue gas spray pipes 13 is umbrella-shaped, the extreme end of the inner flue gas spray pipes 12 is provided with a horn mouth 15, the length of the inner flue gas spray pipes 12 is longer than that of the outer flue gas spray pipes 13, so that the extreme ends of the inner flue gas spray pipes 12 and the diffuser 14 extend out of the outer flue gas spray pipes 13, the gas flow sprayed from the flame tube 2 comprises an inner annular gas flow, an intermediate annular smoke flow and an outer annular air flow from inside to outside, and an ignition device is arranged in the shell 1.
In addition, in the embodiment, the inner wall of the flame tube 2 is provided with air swirling teeth 15, which can generate swirling flow of air and introduce partial smoke circulation, and the swirling flow gas can regulate flame shape and overcome hearth resistance by matching with the flame tube.
The ignition device in this embodiment comprises an ignition tube 16 arranged in a housing, one end of the ignition tube 16 is communicated with an ignition gas inlet 17, the other end of the ignition tube 16 extends into the flame tube 2 and is provided with an ignition and pilot flame nozzle 18, and an automatic electronic ignition element 19 is arranged at the position of the ignition and pilot flame nozzle 18.
In this embodiment, the gas pipe 6 is connected to the gas inlet 3 via a gas inlet duct 20, the air inlet 5 is connected to the air channel 10 via an air inlet duct 21, and the circulating flue gas pipe 7 is connected to the circulating flue gas inlet 4 via a circulating flue gas inlet duct 22.
Further, in the present embodiment, the gas intake duct 20 is provided with a circulating smoke electric control valve 23, which can be used for the intake air amount of the circulating smoke; an electric damper 24 is provided on the air inlet duct 21, and can be used to control the amount of air taken in; the gas inlet pipeline 22 is provided with a gas electric regulating valve 25 which can be used for controlling the gas inlet amount of the gas; the electric control valve 23, the gas electric control valve 25 and the electric control damper 24 are all provided with servo motors 26.
In addition, the shell is also provided with an installation connecting flange 27 and an inspection door 28, and the inspection door 28 can be convenient for maintenance and inspection.
The working process of the flue gas circulation ultralow nitrogen combustion device is as follows: after the fuel gas is introduced from the fuel gas inlet, the fuel gas is firstly diffused through the diffuser to form a hollow area, meanwhile, the circulating flue gas is discharged after entering from the circulating flue gas inlet through the circulating flue gas pipe, is diffused under the action of the horn mouth and the fuel gas at the inner side, the circulating flue gas is used for blocking the fuel gas from air and then is mixed with the fuel gas for dilution, and then is mixed with the combustion-supporting air at the outermost side, and the combustion-supporting air is ignited through the ignition device to burn and output a plurality of flames. The method can realize the diffusion type lag extension combustion process, reduce the temperature of a combustion center, prevent nitrogen oxides from generating, realize low-nitrogen combustion and low-nitrogen environment-friendly emission, and through detection, the NOx emission is reduced to different degrees under different loads and is less than 50 mg/cubic meter, which is far lower than 150 mg/cubic meter required by national standards, the emission meets the special emission limit requirement of atmospheric pollutants in the national atmospheric pollutant emission standard GB13271-2014, and also meets the emission standard of severe NOx of gas boilers in various national provinces.
At present, the traditional flue gas introducing mode realizes the mixing with flue gas in a furnace through the gas diffusion and turbulence action in a combustion area, and has the problems of small mixing space of the introduced flue gas, air and fuel gas, short contact time, difficulty in realizing full mixing and easiness in causing uneven oxygen concentration distribution at an outlet of a combustor; the local oxygen concentration in the combustion area is easy to be too high, so that the local high temperature of the hearth is caused, the formation of NOx is promoted, and the emission reduction of the NOx is not facilitated. Therefore, the flue gas circulation ultralow-nitrogen combustion device provided by the invention has the advantages that the outer circulation low-temperature flue gas taken at the flue gas outlet outside the boiler is provided with a layer of flue gas outside the flammable gas exhausted by the mechanism of the combustion device, so that the effects of flame retardance and cooling combustion are achieved, the oxygen concentration and the temperature of a combustion area can be effectively reduced, the generation of NOx in the gas combustion process is inhibited, the ultralow emission of the NOx of the gas boiler is realized, the environmental protection emission cost can be reduced for enterprises, the requirements of national energy conservation and emission reduction recycling economy can be responded, and huge social and economic benefits can be created; meanwhile, the heat generated by combustion can be effectively utilized, and no heat loss exists.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (6)
1. The utility model provides a flue gas circulation ultralow nitrogen burner, includes casing and flame tube, be provided with gas inlet, circulation flue gas inlet, air inlet on the casing respectively, its characterized in that: the gas pipe and the circulating flue gas pipe are coaxially arranged, the gas pipe is arranged outside the circulating flue gas pipe, a cavity between the gas pipe and the circulating flue gas pipe forms a gas channel, an inner cavity of the circulating flue gas pipe forms a flue gas channel, a cavity between the shell, a flame pipe and the gas pipe forms an air channel, the gas pipe forms a gas cavity at the tail end and the circulating flue gas pipe forms a flue gas cavity at the tail end, the flue gas cavity is connected with a plurality of outer flue gas spray pipes, inner gas spray pipes which are coaxially arranged with the outer flue gas spray pipes are respectively arranged in the outer flue gas spray pipes, the inner gas spray pipes are respectively communicated with the gas cavity, the gas pipes and the circulating flue gas pipes form a plurality of inner gas spray pipes and outer flue gas spray pipes which are coaxially arranged at the tail end, the inner gas spray pipes are respectively communicated with the gas pipe, the inner gas spray pipes and the outer flue gas spray pipes are respectively communicated with the inner ring-shaped flue gas spray pipes, and the inner ring-shaped flue gas spray pipes are respectively arranged at the tail ends of the inner ring-shaped flue gas spray pipes and the outer ring-shaped flue gas spray pipes are respectively arranged from the outer ring-shaped flue gas spray pipes;
The tail end of the outer flue gas spraying pipe is provided with a horn mouth;
the length of the inner gas spray pipe is longer than that of the outer gas spray pipe, so that the tail end of the inner gas spray pipe and the diffuser extend out of the outer gas spray pipe;
The diffuser is umbrella-shaped;
air swirl teeth are arranged on the inner wall of the flame tube.
2. A flue gas recirculation ultra-low nitrogen combustion device according to claim 1, wherein: the ignition device comprises an ignition tube arranged in the shell, one end of the ignition tube is communicated with the ignition gas inlet, the other end of the ignition tube extends into the flame tube and is provided with an ignition and pilot flame nozzle, and an automatic electronic ignition element is arranged at the position of the ignition and pilot flame nozzle.
3. A flue gas recirculation ultra-low nitrogen combustion device according to claim 1, wherein: the gas pipe is connected with the gas inlet through a gas inlet pipe, the air inlet is connected with the air channel through an air inlet pipe, and the circulating flue gas pipe is connected with the circulating flue gas inlet through a circulating flue gas inlet pipe.
4. A flue gas recirculation ultra-low nitrogen combustion device according to claim 3, wherein: the gas inlet pipeline is provided with a gas electric regulating valve, the air inlet pipeline is provided with an electric regulating air door, the gas inlet pipeline is provided with a gas electric regulating valve, and the gas electric regulating valve and the electric regulating air door are respectively provided with any one of an electric actuator or a servo motor.
5. A flue gas recirculation ultra-low nitrogen combustion device according to claim 1, wherein: and the shell is provided with a mounting connection flange.
6. A flue gas recirculation ultra-low nitrogen combustion device according to claim 1, wherein: an inspection door is arranged on the shell.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910856512.0A CN110469848B (en) | 2019-09-11 | 2019-09-11 | Flue gas circulation ultralow nitrogen combustion device |
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| CN201910856512.0A CN110469848B (en) | 2019-09-11 | 2019-09-11 | Flue gas circulation ultralow nitrogen combustion device |
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| CN110469848A CN110469848A (en) | 2019-11-19 |
| CN110469848B true CN110469848B (en) | 2024-08-02 |
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| CN111043598B (en) * | 2019-12-24 | 2024-11-26 | 宁夏吉元冶金集团有限公司 | A high combustion efficiency and low nitrogen burner |
| CN112377901A (en) * | 2020-10-30 | 2021-02-19 | 太原绿威环境能源科技工程有限公司 | Combustion head of air and gas premixing combustor of condensing boiler and premixing combustion method thereof |
Citations (2)
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| CN109539250A (en) * | 2018-10-30 | 2019-03-29 | 西安交通大学 | A kind of low NO and its built-in flue gas recycled introducing device |
| CN210831978U (en) * | 2019-09-11 | 2020-06-23 | 江阴德尔热能机械有限公司 | Flue gas circulation ultra-low nitrogen combustion device |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2028504A6 (en) * | 1989-04-07 | 1992-07-01 | Balsiger Benno | Apparatus for flue gas recirculation in oil and gas burners. |
| DE4215763C2 (en) * | 1992-05-13 | 1996-01-11 | Ppv Verwaltungs Ag | burner |
| CN205655295U (en) * | 2016-05-12 | 2016-10-19 | 徐州科融环境资源股份有限公司 | Fractional combustion gas low NOx burner |
| CN110107898B (en) * | 2019-05-30 | 2024-03-26 | 唐山金沙燃烧热能股份有限公司 | Coke oven gas low-nitrogen burner |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109539250A (en) * | 2018-10-30 | 2019-03-29 | 西安交通大学 | A kind of low NO and its built-in flue gas recycled introducing device |
| CN210831978U (en) * | 2019-09-11 | 2020-06-23 | 江阴德尔热能机械有限公司 | Flue gas circulation ultra-low nitrogen combustion device |
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