Exhaust gas combustion device with diversion structure

Abstract

The present invention discloses an exhaust gas combustion device with a diversion structure, comprising a burner having an air inlet end and a flame ejection end, wherein air and gas are introduced into the air inlet end, and the gas forms a burning flame after being ignited at the flame ejection end. An exhaust gas diversion chamber is provided on one side of the flame ejection end of the burner, surrounding the flame. The exhaust gas diversion chamber has an exhaust gas diversion wall and an exhaust gas diversion pipe. The exhaust gas diversion wall is provided with a plurality of exhaust gas introduction holes, wherein the exhaust gas introduced by the exhaust gas introduction holes directly contacts and burns with the outer layer of the flame outer flame. The exhaust gas diversion pipe extends from the exhaust gas diversion wall into the flame, and the exhaust gas outlet end extends to the inner layer of the flame outer flame, so that the exhaust gas flows out from the exhaust gas diversion pipe outlet end and directly contacts and burns with the inner layer of the outer flame. The present invention improves combustion efficiency, helps reduce the amount of gas used, and reduces the energy consumption and treatment cost of exhaust gas combustion.

Description

Technical Field

[0001] The invention belongs to the technical field of waste gas treatment. Background Art

[0002] An RTO (Regenerative Thermal Oxidizer) is a highly efficient waste gas treatment device for VOCs (volatile organic compounds). Its basic principle is to decompose organic waste gases into carbon dioxide and water through high-temperature heating, thereby achieving waste gas purification and discharge. However, high-temperature heating requires very high temperatures (typically between 760 and 1000 degrees Celsius) to decompose organic waste gases into carbon dioxide and water, resulting in high energy consumption.

[0003] To reduce energy consumption, the applicant filed a prior patent application in China with publication number CN118391693A, which discloses an energy-saving and environmentally friendly combustion treatment device for waste gas containing combustibles. The device includes a burner having an air inlet and a flame ejection end. Air is introduced into the air inlet of the burner. A guide wall for guiding the flame ejection is provided on one side of the flame ejection end of the burner. The guide wall is provided with a plurality of exhaust gas inlet holes. The exhaust gas inlet holes introduce exhaust gas containing combustibles, which is ignited by the flame ejected from the flame ejection end of the burner. The exhaust gas introduced through the exhaust gas inlet holes directly contacts the outer layer of the flame to be burned, but the inner layer of the flame is not effectively utilized, resulting in low combustion efficiency. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a waste gas combustion device with a diversion structure, which allows the inner and outer layers of the flame to burn waste gas at the same time, greatly improving the combustion efficiency and reducing the energy consumption and treatment cost of waste gas combustion.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A waste gas combustion device with a diversion structure includes a burner with an air inlet end and a flame injection end, wherein air and gas are introduced into the air inlet end, and the gas forms a burning flame after being ignited at the flame injection end. An exhaust gas diversion chamber is arranged around the flame on one side of the flame injection end of the burner, and the exhaust gas diversion chamber has an exhaust gas diversion wall and an exhaust gas diversion pipe. A plurality of exhaust gas inlet holes are opened on the exhaust gas diversion wall, wherein the exhaust gas introduced by the exhaust gas inlet holes directly contacts the outer layer of the flame outer flame and burns, and the exhaust gas diversion pipe extends from the exhaust gas diversion wall into the flame and the exhaust gas outlet end extends to the inner layer of the flame outer flame, so that the exhaust gas directly contacts the inner layer of the outer flame and burns after flowing out from the exhaust gas outlet end of the exhaust gas diversion pipe.

[0007] Preferably, the exhaust gas drainage cavity is a bell-mouth structure, and the exhaust gas drainage pipe is provided with a middle extension section which extends from the exhaust gas drainage wall to the radial middle position of the bell-mouth structure.

[0008] Preferably, the exhaust gas drainage pipe is further provided with an outer extension section extending from the middle extension section to the inner layer of the outer flame of the flame, and the end of the outer extension section is a gas outlet end.

[0009] Preferably, the exhaust gas drainage pipe includes a forward drainage exhaust gas drainage pipe whose gas outlet end extends to the front side of the outer flame of the flame.

[0010] Preferably, the exhaust gas drainage pipe further includes a lateral drainage exhaust gas drainage pipe whose gas outlet end extends to the side of the outer flame of the flame.

[0011] Preferably, the gas outlet ends of the forward drainage exhaust gas drainage pipe and the side drainage exhaust gas drainage pipe are staggered in the axial direction of the exhaust gas drainage cavity.

[0012] Preferably, the ratio of the exhaust gas introduced by the exhaust gas introduction hole to the exhaust gas introduced by the exhaust gas drainage pipe is 1-5:5-9.

[0013] Further preferably, the ratio of the exhaust gas introduced by the exhaust gas inlet hole to the exhaust gas introduced by the exhaust gas drainage pipe is 1:1.5.

[0014] Preferably, the inner end of the exhaust gas introduction hole protrudes from the inner side of the exhaust gas guide wall.

[0015] Preferably, a flame baffle is provided at the front end of the exhaust gas diversion chamber.

[0016] The present invention adopts the above technical solution and has the following beneficial effects:

[0017] 1. Exhaust gas enters from behind the flame. In order to make the exhaust gas fully contact with the outer flame of the flame, an exhaust gas diversion chamber arranged around the flame is provided on one side of the flame injection end of the burner, wherein the exhaust gas diversion chamber has an exhaust gas diversion wall and an exhaust gas diversion pipe, and a number of exhaust gas inlet holes are opened on the exhaust gas diversion wall, wherein the exhaust gas introduced by the exhaust gas inlet holes directly contacts the outer layer of the outer flame of the flame and burns instantaneously, and the exhaust gas diversion pipe extends into the flame from the exhaust gas diversion wall. Since the outlet end of the exhaust gas diversion pipe extends to the inner layer of the outer flame of the flame, the exhaust gas can be directly contacted with the inner layer of the outer flame after flowing out from the outlet end of the exhaust gas diversion pipe and burn instantly. Therefore, the outer layer and the inner layer of the outer flame of the flame are in contact with the exhaust gas, and the exhaust gas is more evenly contacted with the outer flame of the flame, which is conducive to achieving instantaneous combustion of the exhaust gas and sufficient combustion without residue, thereby improving combustion efficiency, helping to reduce the use of gas, and reducing the energy consumption and treatment cost of exhaust gas combustion.

[0018] The flame is divided into three parts: the outer flame, the inner flame, and the flame core. The outer flame has the highest temperature, followed by the inner flame, and the flame core has the lowest temperature. Since the exhaust gas is instantly ignited by the outer flame (including the outer and inner layers of the outer flame), the inner flame and the flame core do not participate in the combustion of the exhaust gas. The temperature in the exhaust gas drainage cavity (which serves as the combustion chamber) does not need to be set too high, usually between 100 and 300 degrees Celsius, that is, low-temperature combustion. Low-temperature combustion can completely burn the exhaust gas. Compared with the high temperature of 760 to 1000 degrees Celsius required for RTO, low-temperature combustion has a significantly lower temperature, and the corresponding energy consumption is also greatly reduced. In addition, after the exhaust gas is burned by the outer flame, it is mixed with the high-temperature gas generated by the flame combustion. Because the impurities have been completely burned, the hot gas generated is clean and can be directly reused in the heating cavity, such as to heat the oven.

[0019] 2. The exhaust gas drainage cavity has a bell-mouth structure, and the corresponding exhaust gas drainage wall is also adapted to the shape of the flame. Its length, diameter, and taper can be designed according to the flame shape, and the outer flame increases in diameter from the rear to the front along the axial direction. Because the exhaust gas drainage pipe has a central extension section that extends from the exhaust gas inlet hole to the radial center of the bell-mouth structure, the central extension section extends into the flame. In addition, the exhaust gas drainage pipe also has an outer extension section that extends from the central extension section to the inner layer of the outer flame. The outer extension section terminates at the outlet end, allowing the exhaust gas flowing out of the outlet end of the exhaust gas drainage pipe to directly contact the inner layer of the outer flame and burn.

[0020] 3. The outer flame can be divided into the outer flame front and the outer flame side. The outer flame front is located axially forward, while the outer flame side is located radially outward. The outer flame side preferentially burns the exhaust gas introduced by the exhaust gas inlet hole. However, in the existing technical solution, the outer flame front almost does not participate in the exhaust gas combustion. Therefore, the outer flame front can be used to burn the exhaust gas introduced by the exhaust gas drainage pipe. Accordingly, the structure of the exhaust gas inlet pipe is designed so that the outlet end of the forward drainage exhaust gas drainage pipe extends to the inner layer of the flame front of the outer flame.

[0021] 4. A lateral exhaust gas drainage pipe can also be provided. Since the outlet of the lateral exhaust gas drainage pipe extends to the inner layer of the outer flame, a portion of the exhaust gas can be burned in the inner layer of the outer flame. At the same time, the outlet ends of the forward exhaust gas drainage pipe and the lateral exhaust gas drainage pipe are staggered in the axial direction of the exhaust gas drainage cavity to evenly distribute the exhaust gas to different locations in the inner layer of the outer flame for combustion.

[0022] 5. The ratio of the exhaust gas introduced by the exhaust gas inlet hole to the exhaust gas introduced by the exhaust gas drainage pipe is 1 to 5:5 to 9. The specific ratio of the exhaust gas introduced by the two can be designed according to the exhaust gas flow rate and flame size.

[0023] 6. The inner end of the exhaust gas inlet hole protrudes from the inner side of the exhaust gas guide wall. The protrusion height is related to the flow rate of the exhaust gas passing through. By setting a certain protrusion height, the exhaust gas flow rate can be increased to a certain extent.

[0024] 7. Since a flame baffle is provided at the front end of the exhaust gas diversion chamber, it can block the external flame, especially when the flame is large, so that the exhaust gas can fully contact the external flame.

[0025] The specific technical solutions and beneficial effects of the present invention will be described in detail in the following specific embodiments with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0027] Figure 1 This is a schematic diagram of a first embodiment of an exhaust gas combustion device with a diversion structure according to the present invention;

[0028] Figure 2 yes Figure 1 Schematic diagram of the relative position structure of the exhaust gas diversion cavity and the flame;

[0029] Figure 3 This is an axial view of the flame baffle disposed at the front end of the exhaust gas diversion chamber;

[0030] Figure 4 This is a schematic structural diagram of the multi-layer arrangement of the exhaust gas drainage pipe in the second embodiment;

[0031] Figure 5 This is a schematic structural diagram of the relative positions of the exhaust gas guide chamber and the flame in Example 3;

[0032] In the figure: burner 1, exhaust gas drainage chamber 2, exhaust gas drainage wall 21, exhaust gas inlet hole 22, exhaust gas drainage pipe 23, forward drainage exhaust gas drainage pipe 231, side drainage exhaust gas drainage pipe 232, flame baffle 24, flame 3, flame core 31, inner flame 32, outer flame 33, inner layer 331. DETAILED DESCRIPTION

[0033] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0034] Those skilled in the art will appreciate that, unless there is any conflict, the features in the following embodiments and implementations may be combined with each other.

[0035] The terms used in this disclosure are for the purpose of describing specific embodiments only and are not intended to limit the disclosure. For example, terms such as "front" and "rear" that indicate orientation or positional relationships are based solely on the orientation or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the disclosure. They do not indicate or imply that the device or component referred to must have a specific orientation or be constructed or operated in a specific orientation. Therefore, they should not be construed as limiting the disclosure.

[0036] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," and "fixed" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; and direct or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of these terms in the present invention based on specific circumstances.

[0037] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0038] A flame consists of three parts: the outer flame, the inner flame, and the core. The outer flame has the highest temperature, followed by the inner flame, and the core has the lowest. Therefore, exhaust gas combustion is best achieved by igniting the outer flame. The patent application mentioned in the background art employs a method of directing exhaust gas from an exhaust gas inlet port to the outer flame, resulting in instantaneous and complete combustion of the exhaust gas.

[0039] Example 1

[0040] like Figures 1 to 3As shown, this embodiment provides an exhaust gas combustion device with a diversion structure, which can directly use the outer and inner layers of the outer flame to burn the exhaust gas. The figure only illustrates a partial structure. The exhaust gas combustion device includes a burner 1 with an air inlet end and a flame ejection end, wherein air and gas are introduced into the air inlet end, and the gas is ignited at the flame ejection end to form a burning flame 3. An exhaust gas diversion chamber 2 is provided on one side of the flame ejection end of the burner surrounding the flame 3. The exhaust gas diversion chamber 2 has an exhaust gas diversion wall 21 and an exhaust gas diversion pipe 23. The exhaust gas diversion wall 21 is provided with a plurality of exhaust gas introduction holes 22. The exhaust gas to be burned can be divided into two parts, wherein the first part of the exhaust gas is introduced through the exhaust gas introduction hole 22, directly contacts the outer layer of the outer flame and burns, and the second part of the exhaust gas is introduced through the exhaust gas diversion pipe 23. The exhaust gas guide pipe 23 extends into the flame and the outlet end extends to the inner layer 331 of the outer flame, so that the exhaust gas flows out from the outlet end of the exhaust gas guide pipe and directly contacts the inner layer of the outer flame and burns.

[0041] It can be understood that the outer layer and inner layer of the flame outer flame are relative concepts, wherein the outer layer of the flame outer flame is the area near the outermost side of the flame outer flame, and the inner layer 331 of the flame outer flame refers to the area between the outer layer and the inner flame of the flame.

[0042] The exhaust gas enters from behind the flame. In order to make the exhaust gas fully contact with the outer flame of the flame, an exhaust gas diversion chamber arranged around the flame is provided on one side of the flame injection end of the burner, wherein the exhaust gas diversion chamber has an exhaust gas diversion wall and an exhaust gas diversion pipe, and a plurality of exhaust gas inlet holes are opened on the exhaust gas diversion wall. The exhaust gas introduced by the exhaust gas inlet holes directly contacts the outer layer of the outer flame of the flame and burns instantaneously. The exhaust gas diversion pipe is connected and fixed to the exhaust gas diversion wall, and the exhaust gas diversion pipe extends into the flame from the exhaust gas diversion wall. Since the exhaust gas outlet end of the exhaust gas diversion pipe extends to the inner layer of the outer flame of the flame, the exhaust gas can be directly contacted with the inner layer of the outer flame after flowing out from the exhaust gas outlet end of the exhaust gas diversion pipe and burn instantly. Therefore, the outer layer and the inner layer of the outer flame of the flame are in contact with the exhaust gas, and the exhaust gas is more evenly contacted with the outer flame of the flame, which is conducive to achieving instantaneous combustion of the exhaust gas, and the combustion is sufficient and residue-free, thereby improving the combustion efficiency, helping to reduce the use of gas, and reducing the energy consumption and treatment cost of exhaust gas combustion.

[0043] The flame is divided into three parts: the outer flame, the inner flame, and the flame core. The outer flame has the highest temperature, followed by the inner flame, and the flame core has the lowest temperature. Since the exhaust gas is instantly ignited by the outer flame (including the outer and inner layers of the outer flame), the inner flame and the flame core do not participate in the combustion of the exhaust gas. The temperature in the exhaust gas drainage cavity (which serves as the combustion chamber) does not need to be set too high, usually between 100 and 300 degrees Celsius, that is, low-temperature combustion. Low-temperature combustion can completely burn the exhaust gas. Compared with the high temperature of 760 to 1000 degrees Celsius required for RTO, low-temperature combustion has a significantly lower temperature, and the corresponding energy consumption is also greatly reduced. In addition, after the exhaust gas is burned by the outer flame, it is mixed with the high-temperature gas generated by the flame combustion. Because the impurities have been completely burned, the hot gas generated is clean and can be directly reused in the heating cavity, such as to heat the oven.

[0044] In this embodiment, the exhaust gas drainage chamber 2 has a bell-mouth structure, and the exhaust gas drainage pipe 23 includes a central extension section extending from the exhaust gas inlet to the radially central portion of the bell-mouth structure. The bell-mouth structure of the exhaust gas drainage chamber also creates a corresponding exhaust gas drainage wall adapted to the shape of the flame. Its length, diameter, and taper can be designed based on the flame shape, with the outer flame increasing in diameter axially from rear to front.

[0045] Furthermore, the exhaust gas guide tube 23 is further provided with an outer extension section extending from the middle extension section to the inner layer of the outer flame, and the end of the outer extension section is a gas outlet end. Thus, the exhaust gas flowing out of the gas outlet end of the exhaust gas guide tube directly contacts the inner layer of the outer flame and burns.

[0046] The exhaust gas drainage pipe 23 is generally curved in shape and is installed inside the exhaust gas drainage cavity. One end of the exhaust gas drainage pipe 23 is connected to the through hole on the exhaust gas drainage wall 21 , and together with the exhaust gas drainage hole 22 , introduces exhaust gas from outside the exhaust gas drainage cavity.

[0047] The outer flame can be divided into the front and side of the outer flame. The front of the outer flame is located axially forward, while the side of the outer flame is located radially outward. The side of the outer flame preferentially burns the exhaust gas introduced by the exhaust gas inlet hole. However, in the existing technical solution, the front of the outer flame hardly participates in exhaust gas combustion. Therefore, the front of the outer flame can be used to burn the exhaust gas introduced by the exhaust gas drainage pipe. Accordingly, the structure of the exhaust gas inlet pipe is designed accordingly. The exhaust gas drainage pipe 23 includes a forward-flow exhaust gas drainage pipe 231 with the gas outlet end extending to the front of the outer flame.

[0048] To fully utilize the exhaust gas from the external flame combustion, the ratio of exhaust gas introduced by the exhaust gas introduction hole 22 to exhaust gas introduced by the exhaust gas drainage pipe 23 is 1-5:5-9. Specifically, the ratio of exhaust gas introduced by the exhaust gas introduction hole and exhaust gas drainage pipe can be designed based on the exhaust gas flow rate and flame size. Preferably, the ratio of exhaust gas introduced by the exhaust gas introduction hole to exhaust gas introduced by the exhaust gas drainage pipe is 1:1.5.

[0049] Preferably, the inner end of the exhaust gas introduction hole 22 protrudes from the inner side of the exhaust gas guide wall 21. The height of the protrusion is related to the flow rate of the exhaust gas passing through. By setting a certain protrusion height, the flow rate of the exhaust gas can be increased to a certain extent.

[0050] In addition, a flame baffle 24 is provided at the front end of the exhaust gas guide chamber 2. The flame baffle 24 can block the outer flame, especially when the flame is large, so that the exhaust gas can fully contact the outer flame.

[0051] Example 2

[0052] like Figure 4 As shown, based on the first embodiment, a lateral exhaust gas drainage pipe 232 is further provided.

[0053] In this embodiment, the outlet end of the lateral exhaust gas drainage pipe 232 extends to the side of the outer flame, so that a portion of the exhaust gas can be burned using the inner layer of the outer flame.

[0054] Furthermore, the outlet ends of the forward exhaust gas drainage pipe 231 and the lateral exhaust gas drainage pipe 232 are staggered axially within the exhaust gas drainage chamber, forming a multi-layer structure. The staggered axial distance in the figure is L. This allows the exhaust gas to be evenly dispersed to the inner layers of the outer flame at different locations for combustion. It will be appreciated that the specific number and relative number of the forward exhaust gas drainage pipe 231 and the lateral exhaust gas drainage pipe 232 can be designed as needed, and the number of layers in the axial multi-layer structure can also vary.

[0055] Depending on the type of exhaust gas being burned, the amount of gas used, the temperature of the flame, and the shape of the flame will vary. It is understood that the exhaust gas drainage pipe outlet end is designed based on the shape of the outer and inner layers of the flame, including diameter, position, and orientation.

[0056] Example 3

[0057] like Figure 5 As shown, compared with the first embodiment, the flame shield may not be provided.

[0058] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Those skilled in the art will understand that the present invention includes, but is not limited to, the contents described in the above specific embodiment. Any modifications that do not deviate from the functional and structural principles of the present invention are intended to be included within the scope of the claims.

Claims

1. An exhaust gas combustion device with a diversion structure, comprising a burner having an air inlet end and a flame ejection end, wherein air and fuel gas are introduced into the air inlet end, and the fuel gas is ignited at the flame ejection end to form a combustion flame, characterized in that: An exhaust gas drainage chamber is provided around the flame on one side of the flame ejection end of the burner, and the exhaust gas drainage chamber has an exhaust gas drainage wall and an exhaust gas drainage pipe. A plurality of exhaust gas introduction holes are provided on the exhaust gas drainage wall. The exhaust gas introduced by the exhaust gas introduction holes directly contacts the outer layer of the flame outer flame and burns. The exhaust gas drainage pipe extends from the exhaust gas drainage wall into the flame and the gas outlet end extends to the inner layer of the flame outer flame, so that the exhaust gas flows out from the gas outlet end of the exhaust gas drainage pipe and directly contacts the inner layer of the outer flame and burns; the exhaust gas drainage chamber is a bell-mouth structure, and the exhaust gas drainage pipe is provided with an exhaust gas drainage pipe. The exhaust gas drainage pipe is provided with a middle extension section extending to the radial middle position of the bell-mouth structure after the drainage wall is led out. The exhaust gas drainage pipe is also provided with an outer extension section extending from the middle extension section to the inner layer of the outer flame of the flame. The end of the outer extension section is the exhaust outlet end. The exhaust gas drainage pipe includes a forward drainage exhaust gas drainage pipe whose outlet end extends to the front side of the outer flame of the flame. The exhaust gas drainage pipe also includes a lateral drainage exhaust gas drainage pipe whose outlet end extends to the side of the outer flame of the flame. The outlet ends of the forward drainage exhaust gas drainage pipe and the lateral drainage exhaust gas drainage pipe are staggered in the axial direction of the exhaust gas drainage cavity.

2. The exhaust gas combustion device with a diversion structure according to claim 1, characterized in that: The ratio of the exhaust gas introduced by the exhaust gas inlet hole to the exhaust gas introduced by the exhaust gas drainage pipe is 1~5:5~9.

3. The exhaust gas combustion device with a diversion structure according to claim 2, characterized in that: The ratio of the exhaust gas introduced by the exhaust gas inlet hole to the exhaust gas introduced by the exhaust gas drainage pipe is 1:1.

5.

4. The exhaust gas combustion device with a diversion structure according to claim 1, characterized in that: The inner end of the exhaust gas introduction hole protrudes from the inner side of the exhaust gas guide wall.

5. The exhaust gas combustion device with a diversion structure according to claim 1, characterized in that: A flame baffle is provided at the front end of the exhaust gas diversion chamber.

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