CN113432121A - Reducing ring rib water-cooling type surface combustion gas device - Google Patents
Reducing ring rib water-cooling type surface combustion gas device Download PDFInfo
- Publication number
- CN113432121A CN113432121A CN202110641872.6A CN202110641872A CN113432121A CN 113432121 A CN113432121 A CN 113432121A CN 202110641872 A CN202110641872 A CN 202110641872A CN 113432121 A CN113432121 A CN 113432121A
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- cooling water
- reducing ring
- annular cooling
- stage annular
- air inlet
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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
-
- 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
-
- 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
- F23D14/72—Safety devices, e.g. operative in case of failure of gas supply
- F23D14/78—Cooling burner parts
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L9/00—Passages or apertures for delivering secondary air for completing combustion of fuel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D2207/00—Ignition devices associated with burner
Abstract
The invention discloses a water-cooled surface combustion gas device with reducing ring ribs, which comprises the reducing ring ribs, a first-stage annular cooling water pipe and a second-stage annular cooling water pipe, wherein the first-stage annular cooling water pipe and the second-stage annular cooling water pipe are arranged on the reducing ring ribs; the multiple groups of reducing ring ribs and the axis of the combustor form a certain angle theta to form a step-shaped air inlet surface to form isobaric air inlet; the circulation area of the anti-backfire air inlet micro-channel formed by the reducing ring ribs and the ring-arranged cooling water pipes is along the air inlet directionTapering and the outlet forming a continuous "stepped" combustion plane. The invention can realize isobaric gas inlet, uniform fuel gas, low temperature and low NOxSurface combustion, and simultaneously can effectively prevent tempering, and ensure the stability, high efficiency, cleanness and safety of gas fuel during combustion; meanwhile, the structure is simple, the manufacture is convenient, and the device is suitable for batch production.
Description
Technical Field
The invention relates to the technical field of burners, in particular to a reducing ring rib water-cooling type surface combustion gas device.
Background
Although coal resources are still the main energy of energy consumption in China, a large amount of environmental pollutants such as nitrogen oxides, dust and the like can be generated in the combustion process of coal, and various post-treatment technologies also bring extremely high economic cost. Compared with the prior art, the natural gas serving as clean energy has the advantages of high combustion efficiency, low pollutant control cost, less pollutant emission and the like, and meets the development requirement of low-carbon economy better. However, natural gas still produces some atmospheric pollutants such as nitrogen oxides during the combustion process, and is mainly classified into a thermal type, a rapid type and a fuel type according to the source, wherein the generation of the fuel type and the rapid type is almost negligible, and the thermal type NO is almost negligiblexOccupying more than 90% of the total nitrogen oxide emissions. The method has very strict pollutant emission standards in various regions of China, and the emission standard of nitrogen oxides in partial regions is as low as 30mg/m3. At present, the low-nitrogen combustion technology of a gas boiler mainly comprises staged combustion, lean combustion premixing, flue gas recirculation, flameless combustion MILD, cyclone combustion and the like, however, most of low-nitrogen combustion technologies have the defects of high cost, complex structure or poor low-nitrogen combustion effect and the like, so that a gas device with high combustion efficiency, simple structure and good low-nitrogen combustion effect needs to be developed urgently.
Thermal NOxThe main factors influencing the formation are the combustion temperature, the oxygen concentration and the residence time of the reactants, etc., since the calorific value of the gaseous fuel is high, the combustion temperature can usually be as high as 2000K without any cooling measures. When the combustion temperature is higher than 1300 ℃, the reaction rate is increased by 6-7 times, and the generation amount of nitrogen oxides is exponentially increased. The invention can ensure that the mixed gas forms surface combustion on the surface of the combustor, reduces the flame combustion temperature by virtue of the cooling water pipes which are circumferentially arranged at equal intervals, and effectively increases the heat exchange amount and the heat exchange efficiency by virtue of the reducing ring ribs; simultaneously arranging a central secondary air pipe to avoid burning NO by gas fuelxThe excess air factor at which the discharge is highest.
Disclosure of Invention
To is directed atThe invention aims to provide a reducing ring rib water-cooling type surface combustion gas device which can realize isobaric gas inlet, uniform gas, low temperature and low NOxSurface combustion, and simultaneously can effectively prevent tempering, and ensure the stability, high efficiency, cleanness and safety of gas fuel during combustion; meanwhile, the structure is simple, the manufacture is convenient, and the device is suitable for batch production.
In order to achieve the purpose, the invention adopts the technical scheme that:
a water-cooled surface combustion gas device with reducing ring ribs comprises the reducing ring ribs 2, and a plurality of first-stage annular cooling water pipes 4 and second-stage annular cooling water pipes 3 which are arranged on the reducing ring ribs 2, wherein the first-stage annular cooling water pipes 4 are arranged on the outer side, the second-stage annular cooling water pipes 3 are arranged on the inner side, the first-stage annular cooling water pipes 4 and the second-stage annular cooling water pipes 3 are arranged in a staggered manner, an air inlet cylinder 1 is arranged on the outer side of the largest-diameter ring rib of the reducing ring ribs 2, and an ignition gun hole/central secondary air pipeline 5 is arranged on the inner side of the smallest-diameter ring rib of the reducing ring ribs 2;
the multiple groups of reducing ring ribs 2 and the axis of the combustor are arranged at a certain angle theta (0< theta <90 degrees) to form a step-shaped air inlet surface to form isobaric air inlet; the flow area of the anti-backfire air inlet micro-channel 6 formed by the reducing ring ribs 2 and the annular cooling water pipes is gradually reduced along the air inlet direction, the outlet forms a continuous 'step' -shaped combustion plane, and the reducing ring ribs 2 with different diameters are in a laminated relation.
The first-stage annular cooling water pipes 4 and the second-stage annular cooling water pipes 3 are obliquely arranged on the multiple groups of reducing annular ribs 2 at equal intervals along the circumferential direction, and the adjacent first-stage annular cooling water pipes 4, the adjacent second-stage annular cooling water pipes 3 and the reducing annular ribs 2 which are arranged in a staggered mode form the anti-backfire air inlet micro-channel 6.
The first-stage annular cooling water pipe 4 is inclined at an angle theta1The second stage is annularly arranged at the cooling water pipe 3 at an inclination angle theta2＜θ1＝θ。
When the ignition gun hole/the central secondary air pipe 5 is used as a central secondary air pipe, oxygen-deficient part premixed low-temperature surface combustion and oxygen-enriched afterburning are formed; when used as a hole of a firing gun, complete premixed surface combustion is formed.
The first-stage annular cooling water pipe 4, the second-stage annular cooling water pipe 3 and the reducing annular ribs 2 are connected in a welding mode to form a plurality of groups of connected ribbed cooling water pipes.
The invention has the beneficial effects that:
in the invention, a plurality of groups of reducing ring ribs 2 which are arranged at an angle theta with the axis of the combustor present an airflow inlet with a step-shaped structure, when mixed air flows through a step-shaped air inlet surface and enters the anti-backfire air inlet micro-channel 6, isobaric air inlet is formed, the mixed air is ensured to be uniformly fed in the flowing direction, and further uniform surface combustion is formed at an outlet.
The first-stage annular cooling water pipe 4, the second-stage annular cooling water pipe 3 and the reducing annular ribs 2 are connected in a welding mode, and a plurality of groups of connected ribbed cooling water pipes are formed. When the gas forms uniform surface combustion at the outlet of the combustor, due to the heat absorption effect of the ribbed cooling water pipe, low-temperature, clean and uniform surface combustion of the premixed gas can be realized; meanwhile, the optimal heat exchange efficiency and heat exchange amount are realized by reasonably arranging the fins.
The multiple groups of reducing annular ribs 2 arranged at an angle theta with the axis of the combustor present airflow outlets of a step-shaped structure, mixed gas forms a continuous step-shaped combustion plane on the surface of the reducing annular ribs 2, and high-turbulence outlet airflow further enhances the low-temperature combustion effect; meanwhile, the first-stage annular cooling water pipe 4, the second-stage annular cooling water pipe and the multiple groups of reducing annular ribs 2 form an anti-backfire air inlet micro-channel 6, the flow cross section area is gradually reduced along the air inlet direction, backfire in premixed combustion is effectively prevented, and safety of premixed combustion is guaranteed.
The ignition gun hole/central secondary air pipe 5 is welded on the inner side of the annular rib with the smallest diameter, and when the ignition gun hole is used as an ignition gun hole, complete premixing surface low-temperature uniform combustion is formed; when the air is used as a central secondary air pipe, oxygen-deficient part is formed to be premixed with low-temperature surface combustion and oxygen-enriched afterburning, so that NO is not combusted by gas fuelxThe excess air factor at which the discharge is highest.
Drawings
Fig. 1 is an overall structure of the present invention.
FIG. 2 is a front sectional view of the present invention.
Fig. 3 shows a cooling water pipe arrangement in a ring.
Wherein: the air inlet device comprises an air inlet cylinder 1, reducing ring ribs 2, a second-stage annular cooling water pipe 3, a first-stage annular cooling water pipe 4, an ignition gun hole/central secondary air pipe 5 and a tempering-preventing air inlet micro-channel 6.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1-3: the water-cooled surface combustion gas device with the reducing annular ribs is mainly structurally characterized in that mixed gas flows through a step-shaped mixed gas inlet formed by a plurality of groups of reducing annular ribs 2 of an air inlet cylinder 1 to enter, and the air inlet cylinder 1 is arranged on the outer side of the annular ribs with the largest diameter; the first-stage annular cooling water pipe 4 and the second-stage annular cooling water pipe 3 are connected with a plurality of groups of reducing annular ribs 2 in a welding mode to form a ribbed cooling water pipe, and the plurality of groups of reducing annular ribs 2 and the axis of the combustor are arranged at an angle theta; the first-stage annular cooling water pipe 4 is obliquely arranged at equal intervals along the circumferential direction, and the installation angle of the first-stage annular cooling water pipe and the axis of the combustor form theta1Angle theta1θ; the second stage of annularly arranged cooling water pipes 3 are obliquely arranged at equal intervals along the circumferential direction, and the installation angle and the axis of the burner form a theta2Angle theta2＜θ1θ; the multiple groups of reducing ring ribs 4 and the annular cooling water pipes form an anti-backfire air inlet micro-channel 6, the size of the section of the anti-backfire air inlet micro-channel 6 is gradually reduced along the airflow flowing direction, and the outlet forms a step-shaped combustion plane; the igniter bore/central secondary air duct 5 is mounted by welding inside the smallest diameter annular rib.
The working principle of the invention is as follows:
the multiple groups of reducing ring ribs 2 are arranged at an angle theta (0< theta <90 degrees) with the axis of the combustor to form a continuous step-shaped airflow inlet, so that the uniform isobaric air intake of mixed airflow is ensured. The multiple groups of reducing ring ribs 2, the first-stage annular cooling water pipes 4 and the second-stage annular cooling water pipes 3 form the anti-backfire air inlet micro-channel 6, when mixed air flows through the air inlet cylinder 1 and enters the anti-backfire air inlet micro-channel 6 from a continuous step-shaped air inlet, the flow cross section area of the anti-backfire air inlet micro-channel 6 is gradually reduced along the air flow direction, so that premixed flame cannot diffuse into a combustor from a combustion chamber, the combustion safety potential hazard that the premixed flame is easy to backfire is effectively prevented, and the combustion safety is ensured. The invention has simple structure by arranging a plurality of groups of reducing ring ribs 2, the first-stage annular cooling water pipes 4 and the second-stage annular cooling water pipes 3, and the mixed gas flow is uniformly admitted with equal pressure, thereby ensuring the combustion safety and realizing the uniform combustion of the premixed gas on the combustion plane.
The invention is provided with a plurality of stages of annular cooling water pipes, the first stage of annular cooling water pipes 4 are obliquely arranged along the circumferential direction at equal intervals, and the installation angle and the axis of a burner form a theta1Angle theta1θ; the second stage of annularly arranged cooling water pipes 3 are obliquely arranged at equal intervals along the circumferential direction, and the installation angle and the axis of the burner form a theta2Angle theta2＜θ1θ. The annular cooling water pipe is connected with a plurality of groups of reducing annular ribs 2 to form the ribbed cooling water pipe. The inside cooling water that is of ribbed condenser tube realizes the heat transfer of cooling water and burning flame, reduces flame combustion temperature, increases heat transfer area when the ring rib cuts thermal boundary layer, improves heat exchange efficiency, further realizes the low temperature clean burning of gas. The arrangement of the annular cooling water pipes can ensure sufficient heat exchange, and simultaneously, the airflow outlet of the anti-backfire air inlet micro-channel 6 formed by the multiple groups of reducing annular ribs 2 and the annular cooling water pipes is a step-shaped combustion plane, so that the turbulence degree of mixed airflow is further increased, and clean, efficient, uniform, low-temperature and low-NO combustion gas is formed on the combustion planexSurface combustion.
The invention provides two structural schemes aiming at the combustor:
scheme I, a central secondary air pipe 5 is arranged at the center of the combustor to avoid burning NO by gas fuelxThe excess air coefficient when the emission is highest forms the oxygen-poor part for premixing low-temperature surface combustion and oxygen-enriched afterburning, and the low-nitrogen combustion effect is better.
In the second scheme, the ignition hole 5 is arranged in the center of the combustor to form full-premixing low-temperature surface combustion, so that the combustion efficiency is higher.
The specific operation mode of the invention is as follows:
before the mixed gas enters the combustion device, cooling water is firstly introduced into the first-stage annular cooling water pipe 4 and the second-stage annular cooling water pipe 3, then the mixed gas flow is introduced into the anti-backfire air inlet micro-channel 6, and finally ignition is carried out. The temperature of the combustion flame is adjusted according to the amount of cooling water in the adjusting and arranging cooling water pipe in the actual condition in the specific operation process, so that the low temperature and low NO of the fuel gas in the combustion device are ensuredxAnd (4) uniformly burning.
The above contents are only for explaining the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modifications made on the basis of the technical solution according to the technical idea of the present invention, such as the number of stages of the conversion ring cooling water pipe, the shape of the reducing ring rib, etc., fall within the protection scope of the claims of the present invention.
Claims (5)
1. A water-cooled surface combustion gas device with a reducing ring rib is characterized by comprising the reducing ring rib (2), and a plurality of first-stage annular cooling water pipes (4) and second-stage annular cooling water pipes (3) which are arranged on the reducing ring rib (2), wherein the first-stage annular cooling water pipes (4) are arranged on the outer side, the second-stage annular cooling water pipes (3) are arranged on the inner side, the first-stage annular cooling water pipes (4) and the second-stage annular cooling water pipes (3) are arranged in a staggered manner, an air inlet cylinder (1) is arranged on the outer side of the largest diameter ring rib of the reducing ring rib (2), and an ignition gun hole/central secondary air pipeline (5) is arranged on the inner side of the smallest diameter ring rib of the reducing ring rib (2);
the multiple groups of reducing ring ribs (2) are arranged at a certain angle theta with the axis of the combustor to form a step-shaped air inlet surface to form isobaric air inlet; the flow area of the anti-backfire air inlet micro-channel (6) formed by the reducing ring ribs (2) and the annularly-arranged cooling water pipes is gradually reduced along the air inlet direction, the outlet forms a continuous step-shaped combustion plane, and the reducing ring ribs (2) with different diameters are in a laminated relation.
2. The reducing ring rib water-cooling type surface combustion gas device according to claim 1, characterized in that the first stage annular cooling water pipes (4) and the second stage annular cooling water pipes (3) are circumferentially and uniformly and obliquely arranged on a plurality of groups of reducing ring ribs (2) at equal intervals, and the adjacent first stage annular cooling water pipes (4) and the adjacent second stage annular cooling water pipes (3) which are staggered form the anti-backfire air inlet micro-channel (6) together with the reducing ring ribs (2).
3. The reducing ring rib water-cooling type surface combustion gas device according to claim 1, wherein the first-stage ring cooling water pipe (4) is inclined at an angle θ1The second stage ring is arranged at the cooling water pipe (3) with an inclination angle theta2＜θ1＝θ。
4. The reducing ring rib water-cooling type surface combustion gas device according to claim 1, wherein when the ignition gun hole/central secondary air pipe (5) is used as a central secondary air pipe, oxygen-deficient part premixed low-temperature surface combustion and oxygen-enriched afterburning are formed; when used as a hole of a firing gun, complete premixed surface combustion is formed.
5. The reducing ring rib water-cooling type surface combustion gas device according to claim 1, characterized in that the first stage annular cooling water pipe (4), the second stage annular cooling water pipe (3) and the reducing ring rib (2) are connected by welding to form a plurality of groups of connected ribbed cooling water pipes.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110641872.6A CN113432121B (en) | 2021-06-09 | 2021-06-09 | Reducing ring rib water-cooling type surface combustion gas device |
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|---|---|---|---|
| CN202110641872.6A CN113432121B (en) | 2021-06-09 | 2021-06-09 | Reducing ring rib water-cooling type surface combustion gas device |
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| CN113432121A true CN113432121A (en) | 2021-09-24 |
| CN113432121B CN113432121B (en) | 2022-06-21 |
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2021
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|---|---|
| CN113432121B (en) | 2022-06-21 |
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