CN111795383A - Single gas staged burner - Google Patents
Single gas staged burner Download PDFInfo
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- CN111795383A CN111795383A CN202010766833.4A CN202010766833A CN111795383A CN 111795383 A CN111795383 A CN 111795383A CN 202010766833 A CN202010766833 A CN 202010766833A CN 111795383 A CN111795383 A CN 111795383A
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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, e.g. noise reduction means
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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, e.g. noise reduction means
- F23D14/70—Baffles or like flow-disturbing devices
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
Abstract
The invention belongs to the field of kiln thermal equipment manufacturing, and particularly relates to a single-gas staged burner. The staged burner is of a multi-cylinder structure and comprises an axial flow air cylinder arranged on the outermost layer, a gas cylinder arranged in the axial flow air cylinder, a central rotational flow air cylinder arranged in the gas cylinder and a central direct flow air cylinder arranged in the central rotational flow air cylinder; the outer rotational flow air cylinder is arranged on the outer side of the front end of the gas cylinder and positioned between the axial flow air cylinder and the gas cylinder; swirl air guide plates are respectively arranged between the outer swirl air cylinder and the gas cylinder and between the central swirl air cylinder and the central direct-current air cylinder; according to the single-gas staged burner, the die handles in different combustion areas are constructed to reasonably control the flow and the combustion environment in the combustion areas, so that the most common CO and NOx harmful wind is fully combusted or the generation of the harmful wind is inhibited, the combustion efficiency is ensured, meanwhile, the burner is utilized to realize the treatment of harmful substances at the source, the waste gas emission is reduced, the product effect performance is improved, and the environmental protection pressure of industries such as kilns and the like is favorably reduced.
Description
Technical Field
The invention belongs to the field of kiln thermal equipment manufacturing, and particularly relates to a single-gas staged burner.
Background
Since the birth of 1980 s, the fuel staged combustion technology is mostly applied to power plant boilers and rotary cement kilns and is mainly applied to pulverized coal fuel. However, with the stricter national policy on energy conservation and environmental protection, the technology is gradually expanded to various industrial kilns. The existing staged combustion equipment focuses on means such as controlling the interval air flow direction and mixing mode, so that the purposes of improving the combustion efficiency, improving the performance of equipment such as a kiln and the like, increasing the output capacity of a combustor and the like are achieved, but correspondingly, harmful substances such as NOx, CO and the like generated in the combustion process are accumulated along with the continuous development of production work, and the waste gas pollution is caused. Not only increases the enterprise cost, but also brings potential environmental pollution burden to the society and the country.
Disclosure of Invention
The invention aims to provide a single gas staged burner which can effectively improve the combustion efficiency of single gas, realize staged mixed combustion of the gas and combustion-supporting air, control the air flow ratio, realize full combustion of the gas, inhibit the generation of harmful substances such as NOx, CO and the like by utilizing the stock ratio of the gas and the combustion-supporting air, further improve the combustion efficiency and prevent the generation of harmful air.
In order to achieve the purpose, the invention adopts the following technical scheme.
A single gas staged burner with multi-tube structure comprises
The device comprises an outermost layer axial flow air duct 1, a gas cylinder 3 arranged in the axial flow air duct 1, a central rotational flow air duct 4 arranged in the gas cylinder 3, and a central direct flow air duct 5 arranged in the central rotational flow air duct 4; the outer cyclone air cylinder 2 is arranged on the outer side of the front end of the gas cylinder 3 and is positioned between the axial flow air cylinder 1 and the gas cylinder 3;
swirl air guide sheets are respectively arranged between the outer swirl air cylinder 2 and the gas cylinder 3 and between the central swirl air cylinder 4 and the central direct-current air cylinder 5;
a peripheral air channel 10 is formed in the space between the axial flow wind barrel 1 and the gas barrel 3, and the front end of the peripheral air channel 10 is divided by the outer cyclone wind barrel 2 to form an outer axial flow air channel 10a and an inner cyclone air channel 10 b;
a gas channel 11 is formed in the space between the gas cylinder 3 and the central cyclone air cylinder 4, a dispersion plate 11a is arranged at the outlet of the front end of the gas channel 11, and dispersion holes 91 are uniformly formed in the dispersion plate 11 a;
the space between the central rotational flow wind cylinder 4 and the central direct current wind cylinder 5 forms a central rotational flow wind channel 12, and the middle pore passage of the central direct current wind cylinder 5 forms a central direct current wind channel 13.
The single gas staged burner is further improved, the flow ratio of wind flowing through the axial flow wind channel 10a, the rotational flow wind channel 10b, the central rotational flow wind channel 12 and the central direct flow wind channel 13 is 30%: 20%: 40%: 15 percent.
The further improvement of the single gas staged burner is that the sectional area ratio of the axial flow air channel 10a, the rotational flow air channel 10b, the central rotational flow air channel 12 and the central direct flow air channel 13 is 3: 2: 5: 2.
in a further improvement of the single gas staged burner, the ratio of the total flow of the combustion-supporting air flowing through the axial flow air passage 10a, the rotational flow air passage 10b, the central rotational flow air passage 12 and the central direct flow air passage 13 to the total flow of the gas flowing through the gas passage 11 is 15: 10.
in the further improvement of the single gas staged burner, the velocity ratio of the air flow sprayed out of the outlets of the axial air channel 10a, the rotational air channel 10b, the gas channel 11, the central rotational air channel 12 and the central direct-current air channel 13 is 5: 5: 3: 5: 1.
the further improvement of the single gas staged burner is that the air outlet directions of the dispersion holes 91 on each dispersion plate 11a and the vortex air guide sheet on the central vortex air duct 4 are mutually staggered, so that the small gas flows are mutually staggered with the vortex air flows.
The single gas staged burner is further improved, the front end of the axial flow wind barrel 1 firstly approaches to the outer rotational flow wind barrel 2 to form a conical convergent part 1a, and then extends forwards to form a nozzle part 1 b.
In a further improvement of the single gas staged burner, the swirl air guide plates are respectively arranged at the rear side of the swirl air channel 10b and the front side of the swirl air channel 12.
In a further improvement of the single gas staged burner, the swirl flow guide plate comprises a plurality of inclined thin plates 90 which are arranged in a central array to form a propeller shape.
The beneficial effects are that:
on the basis of the single gas staged burner, on one hand, the kinetic energy of a gas outlet is reduced by dispersing the single gas through small holes, the single gas is mutually staggered and mixed with central cyclone wind and central direct current wind in a cyclone manner, so that the central wind and the single gas are fully mixed, the single gas is combusted by about 70 percent by utilizing the central wind, the relative concentration of the single gas is high in the interval, simultaneously, CO rich is generated, a primary combustion area is formed in the primary combustion area,the high-temperature flue gas generated by the combustion reaction can inhibit the formation of NOx; after the coal gas is combusted for the first time, the outside cyclone air and the generated high-temperature flue gas contain CO to be rapidly mixed to form a secondary combustion area, the concentration of the diluted CO is reduced in the secondary combustion area, the combustion reaction can be stably carried out and can be sufficiently combusted, and the CO is combusted to be changed into CO2The harmful wind is avoided, then the peripheral axial flow wind is merged to enable the combustion-supporting wind to be excessive, the combustion-supporting wind reacts with CO which is not completely reacted in a secondary combustion zone to form an excessive combustion zone, the temperature of the airflow of the nozzle is reduced, in the zone, the temperature condition for generating the NOx disappears, the NOx cannot be formed, and then the flow and the combustion environment in the combustion zone are reasonably controlled by constructing die handles in different combustion zones, so that the most common CO and NOx harmful wind can be fully combusted or the generation of the harmful wind is inhibited, the combustion efficiency is ensured, meanwhile, the treatment of harmful substances is realized at the source by using a combustor, the exhaust emission is reduced, the product effect performance is improved, the environmental protection pressure of industries such as a kiln furnace and the like is favorably reduced, and the environment is protected.
Drawings
FIG. 1 is a schematic view of a single gas staged burner configuration;
fig. 2 is a schematic view of the nozzle structure of the single gas staged burner.
Detailed Description
The invention is described in detail below with reference to specific embodiments.
As shown in fig. 1 and 2, the present invention relates to a single gas staged burner, wherein the staged burner is of a multi-cylinder structure, and in order to ensure uniform and stable airflow in each direction and balanced combustion efficiency in each direction, a standard circular structure is preferably adopted in general, and the multi-cylinder structure comprises: the device comprises an outermost layer axial flow air duct 1, a gas cylinder 3 arranged in the axial flow air duct 1, a central rotational flow air duct 4 arranged in the gas cylinder 3, and a central direct flow air duct 5 arranged in the central rotational flow air duct 4; the outer cyclone air cylinder 2 is arranged on the outer side of the front end of the gas cylinder 3 and is positioned between the axial flow air cylinder 1 and the gas cylinder 3;
swirl air guide sheets are respectively arranged between the outer swirl air cylinder 2 and the gas cylinder 3 and between the central swirl air cylinder 4 and the central direct-current air cylinder 5; a peripheral air channel 10 is formed in the space between the axial flow wind barrel 1 and the gas barrel 3, and the front end of the peripheral air channel 10 is divided by the outer cyclone wind barrel 2 to form an outer axial flow air channel 10a and an inner cyclone air channel 10 b; a gas channel 11 is formed in the space between the gas cylinder 3 and the central cyclone air cylinder 4, a dispersion plate 11a is arranged at the outlet of the front end of the gas channel 11, and dispersion holes 91 are uniformly formed in the dispersion plate 11 a; the space between the central rotational flow wind cylinder 4 and the central direct current wind cylinder 5 forms a central rotational flow wind channel 12, and the middle pore passage of the central direct current wind cylinder 5 forms a central direct current wind channel 13.
The cyclone air duct is used for forming the effect that the combustion-supporting air flow impacts the coal gas or the mixed air at a certain angle and speed, the mixing efficiency is improved, the combustion-supporting air can be fully and uniformly mixed with the coal gas, and in order to improve the impact mixing efficiency, in the embodiment, the air outlet directions of the dispersion holes 91 on the dispersion plates 11a and the air outlet directions of the cyclone air guide sheets on the central cyclone air duct 4 are mutually staggered, so that the small coal gas flows impact the cyclone air flows in a staggered manner. The swirl flow guide plates are respectively arranged at the rear side of the swirl air channel 10b and the front side of the swirl air channel 12. The swirl flow guide plate for realizing swirl flow comprises a plurality of inclined thin sheets 90 which are arranged in a central array to form a propeller shape.
As shown in fig. 1 and 2, in order to ensure that the shape of the flame ejected from the nozzle meets the requirements, reduce divergence and control the convergence of the axial flow wind to the central burner cluster, the front end of the axial flow wind barrel 1 firstly approaches the outward rotational flow wind barrel 2 to form a conical convergence part 1a, and then extends forwards to form a nozzle part 1 b.
In order to control the mixing ratio of the combustion-supporting gas and the coal gas and ensure the combustion efficiency, the flow of the air flowing through the axial flow air channel 10a, the rotational flow air channel 10b, the central rotational flow air channel 12 and the central direct flow air channel 13 is limited and set to be 30 percent according to the supplement and the limitation of the combustion air in different combustion stages: 20%: 40%: 15% proportion, based on this, through the restriction to the apoplexy flow of getting into the combustor, can improve combustion-supporting wind utilization ratio when effectively improving coal gas combustion efficiency, reduce the exhaust emission.
In general, although a plurality of combustion-supporting channels are adopted, the combustion-supporting air is generally supplemented by the same air supply pipe, in order to improve the structural parameters of the burner and ensure that the control of the flow and the flow velocity can be ensured under the condition of the same air source, in this embodiment, the cross-sectional area ratio of the axial flow air channel 10a, the rotational flow air channel 10b, the central rotational flow air channel 12 and the core direct flow air channel 13 is 3: 2: 5: 2.
the ratio of the total flow of the combustion-supporting air flowing through the axial flow air passage 10a, the swirling flow air passage 10b, the central swirling flow air passage 12 and the central direct flow air passage 13 to the total flow of the coal gas flowing through the coal gas passage 11 is 15: 10.
further, in order to improve the cut-in speed of the combustion-supporting air, the coal gas and the mixed air, improve the mixing rate, reduce the turbulence of the required vortex, and ensure that the airflows in different layers can be continuously kept relatively stable, so that the combustor can continuously and stably work, in the specific implementation process, the speed ratio of the airflows sprayed out of the outlets of the axial flow air channel 10a, the rotational flow air channel 10b, the coal gas channel 11, the central rotational flow air channel 12 and the central direct flow air channel 13 is controlled to be 5: 5: 3: 5: 1. in the specific implementation process, after the channel section or the flow parameter is fixed, the air outlet size of each channel can be controlled, or the air pressure in different channels can be controlled to realize the purpose.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (9)
1. A single gas staged burner is characterized in that the staged burner is of a multi-barrel structure and comprises an outermost axial flow air barrel (1), a gas barrel (3) arranged in the axial flow air barrel (1), a central rotational flow air barrel (4) arranged in the gas barrel (3), and a central direct flow air barrel (5) arranged in the central rotational flow air barrel (4); the outer cyclone air cylinder (2) is arranged outside the front end of the gas cylinder (3) and is positioned between the axial flow air cylinder (1) and the gas cylinder (3); swirl air guide sheets are respectively arranged between the outer swirl air cylinder (2) and the gas cylinder (3) and between the central swirl air cylinder (4) and the central direct-current air cylinder (5);
a peripheral air channel (10) is formed in the space between the axial flow wind barrel (1) and the gas barrel (3), and the front end of the peripheral air channel (10) is divided by the outer cyclone wind barrel (2) to form an outer axial flow air channel (10a) and an inner cyclone air channel (10 b);
a gas channel (11) is formed in the space between the gas cylinder (3) and the central cyclone air cylinder (4), a dispersion plate (11a) is arranged at the outlet of the front end of the gas channel (11), and dispersion holes are uniformly formed in the dispersion plate (11 a);
the space between the central rotational flow wind cylinder (4) and the central direct current wind cylinder (5) forms a central rotational flow wind channel (12), and the middle pore passage of the central direct current wind cylinder (5) forms a central direct current wind channel (13).
2. The single-gas staged burner according to claim 1, wherein the gas flow ratio through the axial flow air passage (10a), the swirling air passage (10b), the central swirling air passage (12) and the central straight flow air passage (13) is 30%: 20%: 40%: 15 percent.
3. The single gas staged burner according to claim 1, wherein the cross-sectional area ratio of the axial flow air passage (10a), the swirling flow air passage (10b), the central swirling flow air passage (12) and the central straight flow air passage (13) is 3: 2: 5: 2.
4. a single gas staged burner as in claim 1, wherein the ratio of the total flow of combustion supporting gas through the axial flow air passage (10a), the swirling air passage (10b), the central swirling air passage (12), the central straight air passage (13) to the total flow of gas through the gas passage (11) is 15: 10.
5. the single gas staged burner as defined in claim 1, wherein the velocity ratio of the gas flow from the outlets of the axial flow wind channel (10a), the swirling wind channel (10b), the gas channel (11), the central swirling wind channel (12) and the central straight wind channel (13) is 5: 5: 3: 5: 1.
6. the single-gas staged burner as defined in claim 1, wherein the dispersing holes of each dispersing plate (11a) are staggered with the air outlet direction of the air guide plate of the central cyclone air duct (4).
7. The single-gas staged burner as defined in claim 1, wherein the front end of said axial flow wind barrel (1) is first closed to the outer cyclone wind barrel (2) to form a cone-shaped convergent part (1a), and then is extended forward to form a nozzle part (1 b).
8. The single gas staged burner as defined in claim 1, wherein the swirl flow guide vanes are respectively provided at the rear side of the swirl air passage (10b) and the front side of the swirl air passage (12).
9. The single-gas staged burner of claim 1, wherein the swirl flow-inducing fins comprise a plurality of slanted fins arranged in a central array to form a propeller shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010766833.4A CN111795383A (en) | 2020-08-03 | 2020-08-03 | Single gas staged burner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010766833.4A CN111795383A (en) | 2020-08-03 | 2020-08-03 | Single gas staged burner |
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| Publication Number | Publication Date |
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| CN111795383A true CN111795383A (en) | 2020-10-20 |
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| CN202010766833.4A Pending CN111795383A (en) | 2020-08-03 | 2020-08-03 | Single gas staged burner |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113188121A (en) * | 2021-04-01 | 2021-07-30 | 东方电气集团东方锅炉股份有限公司 | Ultralow nitrogen combustor spout, combustor and boiler |
-
2020
- 2020-08-03 CN CN202010766833.4A patent/CN111795383A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113188121A (en) * | 2021-04-01 | 2021-07-30 | 东方电气集团东方锅炉股份有限公司 | Ultralow nitrogen combustor spout, combustor and boiler |
| CN113188121B (en) * | 2021-04-01 | 2022-11-04 | 东方电气集团东方锅炉股份有限公司 | Ultralow nitrogen combustor spout, combustor and boiler |
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