CN210601608U - Gas uniform distribution type premixing burner - Google Patents
Gas uniform distribution type premixing burner Download PDFInfo
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- CN210601608U CN210601608U CN201920812738.6U CN201920812738U CN210601608U CN 210601608 U CN210601608 U CN 210601608U CN 201920812738 U CN201920812738 U CN 201920812738U CN 210601608 U CN210601608 U CN 210601608U
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Abstract
A gas uniform distribution type premixing burner comprises a diffusion chamber, a mixing chamber, a gas homogenizing plate, a metal fiber surface and a flue, wherein the diffusion chamber, the mixing chamber, the gas homogenizing plate, the metal fiber surface and the flue are sequentially arranged along the gas direction and fixedly connected into a whole; the premixed gas inlet is arranged at a gas inlet end below the diffusion chamber; the outlet of the diffusion chamber is connected with the mixing chamber; the gas homogenizing plate is positioned between the mixing chamber and the surface of the metal fiber; the flue is positioned outside the surface of the metal fiber. The utility model has the advantages of it is following: the mixing uniformity of the premixed gas is enhanced; the gas distribution uniformity of the combustion surface is improved; the combustion efficiency reaches more than 99.99 percent, and the emission of NOx is lower than 15ppmv (calculated by 3 percent of oxygen).
Description
Technical Field
The invention relates to the technical field of full-premixing porous surface combustion, in particular to a gas uniform distribution type premixing burner which is suitable for efficient and clean combustion of organic waste gas.
Background
Because of the poor heat conductivity and radiation performance of gas, the traditional combustion which takes free flame as the characteristic inevitably has the defects of uneven temperature distribution, narrow combustion area, excessive pollutant discharge and the like. The premixed combustion mode in the porous medium is a process of burning a gas mixture in a special porous medium material with high temperature resistance and good heat conduction performance. The full-premixing porous surface combustion in the premixing combustion mode has the characteristics of high combustion speed and short flame, can achieve full combustion under the condition of small excess air coefficient, has small discharge amount of CO and NOx, can uniformly conduct heat transfer in a convection mode and a radiation mode, and has high heat efficiency. However, in practical applications, factors such as insufficient mixing of the low-pressure premixed gas, uneven gas distribution on the combustion surface and the like greatly affect the combustion efficiency and low NOx emission performance of such combustors.
Patent document 1(201711007393.9) discloses a combustion gas mixing furnace with a gas uniform distribution device, wherein an inlet of a combustion chamber is connected with the combustion chamber, the gas uniform distribution device is positioned between the combustion chamber and a gas mixing chamber, and a gas distribution hole is arranged at the periphery of the gas uniform distribution device. The gas uniform distribution device realizes the reformation of high-temperature gas generated by the combustion chamber, adjusts the positions of the gas distribution holes and realizes the intensified mixing of high-temperature and low-temperature gas flows. On the other hand, the gas uniform distribution device can also effectively preserve heat of the combustion chamber, thereby avoiding fire extinguishment.
Patent document 2(201611043074.9) discloses a forced fully premixed three-dimensional air mixing chamber in which a plurality of nozzle holes are uniformly provided in a nozzle, and a connection portion between a gas conduit and the nozzle is formed in a curved structure. The gas and air are uniformly and efficiently mixed through reasonable structural design, and the combustion gas requirement of a fully premixed static surface combustion system is ensured.
However, the inlet of the combustion chamber of patent document 1 is a straight pipe section, and the boundary layer flow caused by the wall effect causes a velocity gradient on the radial section of the inlet of the combustion chamber, and the velocity distribution has a large influence on the performance of the planar surface combustion. Patent document 2 enhances radial mixing of two gases by forming a certain angle between the gas injection direction and the main flow air direction, but this method requires a high gas outflow speed to achieve a good mixing effect, which requires a high gas inlet pressure.
In the field of organic waste gas treatment, the pressure of the fuel gas is often low, and the fuel gas injection method of patent document 2 is not suitable for being adopted, and in addition, if the planar surface combustion device is to realize efficient and clean combustion, the requirements on the consistency of the flow speed and direction of the premixed gas before entering the combustion chamber and the mixing uniformity of the premixed gas are high.
Disclosure of Invention
To the above technical problem, the embodiment of the utility model provides a through providing a gaseous equipartition formula mixes combustor in advance, and gas mixing is not good among the solution prior art, the uneven problem of combustion surface temperature distribution.
The purpose of the utility model is realized through the following technical scheme:
a gas uniform distribution type premixing burner comprises a diffusion chamber, a mixing chamber, a gas homogenizing plate, a metal fiber surface and a flue, wherein the diffusion chamber, the mixing chamber, the gas homogenizing plate, the metal fiber surface and the flue are sequentially arranged along the gas direction and fixedly connected into a whole; the premixed gas inlet is arranged at a gas inlet end below the diffusion chamber; the outlet of the diffusion chamber is connected with the mixing chamber; the gas homogenizing plate is positioned between the mixing chamber and the surface of the metal fiber; the flue is positioned outside the surface of the metal fiber.
Preferably, the diffusion chamber is in the shape of a truncated cone or truncated rectangular pyramid with a cone angle of 5 ° to 21 °.
Preferably, the mixing chamber is cylindrical or quadrangular in shape and is matched with the truncated cone or truncated quadrangular pyramid of the diffusion chamber.
Preferably, the cross-sectional area of the mixing chamber is 1.5 to 2 times the cross-sectional area of the outlet of the diffusion chamber.
Specifically, the surface of the gas homogenizing plate is uniformly distributed with through air holes with the same diameter.
Preferably, the arrangement mode of the penetrating air holes is regular triangle or regular quadrangle, the center distance is 2mm-3mm, and the aperture is 1mm-2 mm.
Furthermore, a refractory material layer is uniformly laid on the inner wall of the flue.
Specifically, diffusion chamber, mixing chamber and flue are equipped with mutual fixed connection's ring flange, bolt and nut connect the through-hole has been seted up on the ring flange, the gas homogenizing plate is fixed in on the mixing chamber upper end along the anchor ring, the metal fiber surface sets up on the gas homogenizing plate.
The utility model has the advantages of it is following: (1) the mixing uniformity of the premixed gas is enhanced; (2) the gas distribution uniformity of the combustion surface is improved; (3) the combustion efficiency reaches more than 99.99 percent, and the emission of NOx is lower than 15ppmv (calculated by 3 percent of oxygen).
Drawings
Fig. 1 is a schematic view of an embodiment of the present invention illustrating a gas-uniform premixing burner.
Fig. 2 is a schematic view of a conical frusta shaped diffusion chamber and a corresponding cylindrical mixing chamber in example 1 of the present invention.
Fig. 3 is a schematic view of a truncated rectangular pyramid and a corresponding rectangular prism-shaped mixing chamber in embodiment 2 of the present invention.
Wherein: 1-premixed gas inlet, 2-diffusion chamber, 3-mixing chamber, 31-mixing chamber upper end edge ring surface, 4-gas homogenizing plate, 41-through air hole, 5-metal fiber surface, 6-flue, 61-refractory material layer, 62-inner wall, 7-flange plate, 71-bolt and nut connecting through hole.
The direction of the arrows in fig. 1 is the gas (fuel gas and air) direction.
Detailed Description
The following describes the present invention with reference to the accompanying drawings. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. Furthermore, the technical features mentioned in the embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.
Example 1:
as shown in fig. 1, the present invention includes a premixed gas inlet, a diffusion chamber, a mixing chamber, a gas-homogenizing plate, a metal fiber surface and a flue.
A gas uniform distribution type premixing burner comprises a diffusion chamber, a mixing chamber, a gas homogenizing plate, a metal fiber surface and a flue, wherein the diffusion chamber, the mixing chamber, the gas homogenizing plate, the metal fiber surface and the flue are sequentially arranged along the gas direction and fixedly connected into a whole; the premixed gas inlet is arranged at a gas inlet end below the diffusion chamber; the outlet of the diffusion chamber is connected with the mixing chamber; the gas homogenizing plate is positioned between the mixing chamber and the surface of the metal fiber; the flue is positioned outside the surface of the metal fiber.
As shown in fig. 2, the diffusion chamber is frusto-conical in shape with a cone angle of 15 °.
The mixing chamber is cylindrical and is matched with the truncated cone of the diffusion chamber.
The cross-sectional area of the mixing chamber is 1.5 times the cross-sectional area of the outlet of the diffusion chamber.
The surface of the gas homogenizing plate is uniformly distributed with through air holes with the same diameter.
The arrangement mode of the through air holes is regular triangle or regular quadrangle, the center distance is 2mm, and the aperture is 1 mm.
And a refractory material layer is uniformly laid on the inner wall of the flue.
Diffusion room, mixing chamber and flue are equipped with mutual fixed connection's ring flange, bolt and nut connect the through-hole has been seted up on the ring flange, the gas board is fixed in on the mixing chamber upper end along the anchor ring, the metal fiber surface sets up on the gas board. The refractory material layer is arranged on the gas homogenizing plate and is fixed on the upper end edge ring surface of the mixing chamber through the gas homogenizing plate, as shown in figure 1.
The fuel gas and the air are mixed and then enter the diffusion chamber from the premixed gas inlet, the cone angle of the diffusion chamber is 15 degrees (in another embodiment, 5 degrees), and the specific cone angle can separate a flow boundary layer, so that a large velocity gradient of the fluid on the axial cross section is avoided, and the velocity distribution of the fluid on the outlet cross section of the diffusion chamber is uniform. The abrupt expansion of the flow passage further enhances the mixing of the fuel gas and air since the cross-sectional area of the outlet of the diffusion chamber is only 1/2 (2/3 in another embodiment) of the cross-sectional area of the mixing chamber. The gas homogenizing plate is arranged between the mixing chamber and the surface of the metal fiber, through holes are distributed on the gas homogenizing plate in a regular triangle or a regular quadrangle, the center distance of the through holes is 2mm (3 mm in another embodiment), the hole diameter is 1mm (2 mm in another embodiment), and after fluid in a turbulent flow state in the mixing chamber passes through the through holes, the flow velocity of the mixer is uniformly distributed, and the fluid is uniformly dispersed to the surface of the metal fiber in the same direction to be combusted. The metal fiber surface is made of high-temperature-resistant metal wires in a weaving or knitting mode, and in the embodiment, the metal fiber surface is made of iron-chromium-aluminum alloy metal wires, so that the high-temperature-resistant effect is good.
Example 2:
the difference from the embodiment 1 is that:
as shown in fig. 3, the diffusion chamber is in the shape of a truncated rectangular pyramid with a cone angle of 21 °.
The mixing chamber is in the shape of a quadrangular prism and is matched with the truncated quadrangular pyramid of the diffusion chamber.
The cross-sectional area of the mixing chamber is 1.5 times the cross-sectional area of the outlet of the diffusion chamber.
The arrangement mode of the through air holes is regular triangle or regular quadrangle, the center distance is 3mm, and the aperture is 2 mm.
The rest is the same as in example 1.
The fuel gas and the air are mixed and then enter the diffusion chamber from the premixed gas inlet, the cone angle of the diffusion chamber is 21 degrees, and the flow boundary layer can be separated through the specific cone angle, so that the large velocity gradient of the fluid on the axial cross section is avoided, and the velocity distribution of the fluid on the outlet section of the diffusion chamber is uniform. The abrupt expansion of the flow passage further enhances the mixing of the fuel gas and air since the cross-sectional area of the outlet of the diffusion chamber is only 2/3 of the cross-sectional area of the mixing chamber. The gas homogenizing plate is arranged between the mixing chamber and the surface of the metal fiber, through holes are distributed on the gas homogenizing plate in a regular triangle or a regular quadrilateral mode, the center distance of the through holes is 3mm, the aperture is 2mm, and after fluid in a turbulent flow state in the mixing chamber passes through the through holes, the mixer is uniformly distributed in flow speed and uniformly dispersed to the surface of the metal fiber to be combusted.
The above description is only for the preferred embodiment of the present invention, but the present invention should not be limited to the disclosure of the embodiment and the accompanying drawings. Therefore, all the equivalents and modifications which are not disclosed in the present invention are within the scope of the present invention.
Claims (9)
1. A gas uniform distribution type premixing burner is characterized by comprising a diffusion chamber, a mixing chamber, a gas homogenizing plate, a metal fiber surface and a flue, wherein the diffusion chamber, the mixing chamber, the gas homogenizing plate, the metal fiber surface and the flue are sequentially arranged along the gas direction and fixedly connected into a whole; the premixed gas inlet is arranged at a gas inlet end below the diffusion chamber; the outlet of the diffusion chamber is connected with the mixing chamber; the gas homogenizing plate is positioned between the mixing chamber and the surface of the metal fiber; the flue is positioned outside the surface of the metal fiber.
2. The gas-distributed premix burner as in claim 1, wherein the diffusion chamber is shaped as a truncated cone or a truncated rectangular pyramid with a cone angle of 5 ° to 21 °.
3. The gas-uniform premixing burner of claim 2 wherein the mixing chamber is cylindrical or quadrangular in shape and fits with the diffusion chamber truncated cone or truncated rectangular pyramid.
4. The gas uniform distribution premix burner of claim 3 wherein the mixing chamber cross-sectional area is 1.5-2 times the diffusion chamber exit cross-sectional area.
5. The gas uniform distribution type premix burner according to any of claims 1 to 4, wherein the surface of the gas uniform plate is uniformly distributed with through holes having the same diameter.
6. The gas uniform distribution type premix burner of claim 5, wherein the arrangement of the through holes is regular triangle or regular quadrangle, the center distance is 2mm-3mm, and the aperture is 1mm-2 mm.
7. The gas uniform distribution type premix burner according to any of claims 1 to 4 and 6, wherein the flue is uniformly coated with a refractory material layer along the inner wall.
8. The gas uniform distribution type premix burner of claim 5, wherein the flue is uniformly coated with a refractory material layer along the inner wall.
9. The gas uniform distribution type premix burner of claim 1, wherein the diffusion chamber, the mixing chamber and the flue are provided with flanges fixedly connected with each other, the flanges are provided with bolt and nut connecting through holes, the gas homogenizing plate is fixed on an annular surface of an upper end edge of the mixing chamber, and the surface of the metal fiber is arranged on the gas homogenizing plate.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920812738.6U CN210601608U (en) | 2019-05-31 | 2019-05-31 | Gas uniform distribution type premixing burner |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920812738.6U CN210601608U (en) | 2019-05-31 | 2019-05-31 | Gas uniform distribution type premixing burner |
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| CN210601608U true CN210601608U (en) | 2020-05-22 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110195865A (en) * | 2019-05-31 | 2019-09-03 | 武汉索克能源科技有限公司 | A kind of even gas distribution formula premix burner |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110195865A (en) * | 2019-05-31 | 2019-09-03 | 武汉索克能源科技有限公司 | A kind of even gas distribution formula premix burner |
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Effective date of registration: 20200925 Address after: 430000 no.509 luojiadun, Qiaokou District, Wuhan City, Hubei Province Patentee after: Zhou Jicheng Address before: 430074 new technology development in East Lake, Wuhan, Hubei, No. 1, 269, 1, Optics Valley Chuang Jie street. Patentee before: WUHAN SUOKE ENERGY TECHNOLOGY Co.,Ltd. |