A catalyst-enhanced waste gas combustion device

Abstract

The present invention provides a catalyst-enhanced waste gas combustion device, comprising a burner and a flame guiding wall. The burner is provided with an air inlet end and a flame jet end. The flame guiding wall is arranged on one side of the flame jet end of the burner. The flame guiding wall is arranged along the circumferential direction of the burner. An exhaust gas inlet hole is arranged at one end of the flame guiding wall close to the burner. The device further comprises a catalyst metal mesh, which is fixedly installed inside the end of the flame guiding wall far from the burner. The catalyst metal mesh is located in the outer flame region of the burner. By adopting such a scheme, the combustion and oxidative decomposition process of VOCs is optimized by introducing a catalyst mesh structure during the combustion process and combining with the mesh structure design, which not only significantly improves the waste gas treatment efficiency, but also effectively reduces the energy consumption. Different from the traditional technology, the device combines high-temperature direct combustion with catalytic combustion for use.

Description

Technical Field

[0001] The present invention belongs to the technical field of waste gas combustion devices, and particularly relates to a catalyst-enhanced waste gas combustion device. Background Art

[0002] The removal of volatile organic compounds has always been a key issue in the field of waste gas treatment. Traditional waste gas treatment methods, such as regenerative thermal oxidation (RTO) equipment, decompose waste gas into carbon dioxide and water by heating it at high temperatures to achieve a purification effect. Although RTO technology has high efficiency in treating volatile organic compound (VOCs) waste gas, its operating temperature usually needs to be maintained between 760°C and 1000°C. Such a high-temperature environment not only results in significant energy consumption but also restricts the further development of the technology in terms of energy conservation and environmental protection. Therefore, how to reduce energy consumption and optimize the treatment process while ensuring the waste gas purification effect has become a research hotspot in the industry.

[0003] Currently, traditional waste gas combustion devices usually treat waste gas through the high-temperature flame and hot gas flow generated by a burner. However, in traditional devices, the inner layer area of the outer flame of the flame is often not fully utilized. Specifically, although the waste gas can contact the outer layer of the outer flame of the flame to complete partial combustion, the high-temperature heat energy in the inner layer area is not fully stimulated and utilized due to the lack of an effective guiding or catalytic mechanism. This deficiency directly limits the overall combustion efficiency. In addition, waste gas often contains particulate matter, especially colloids. If these particles are not effectively treated, they are likely to cause blockage of the regenerator, thus affecting the stable operation and efficiency of the entire system.

[0004] To address this problem, prior art has attempted to improve combustion efficiency by optimizing the flow guiding structure. For example, the applicant proposed a waste gas combustion device with a flow guiding cavity and a flow guiding pipe in a previous patent (patent application number: 2024114136299). By reasonably designing the flow guiding structure, this device enables the waste gas to contact the outer layer of the flame more evenly, improving the waste gas combustion efficiency. However, this technology still has limitations when dealing with complex and diverse waste gas components and the demand for efficient combustion. For example, when treating VOCs waste gas with different chemical properties or concentrations, the existing methods are not sufficient to respond flexibly, especially in terms of energy consumption optimization and adaptability to multi-component waste gas.

[0005] Therefore, in view of the above deficiencies, the present invention proposes a catalyst-enhanced waste gas combustion device. Summary of the Invention

[0006] The present invention provides a catalyst-enhanced waste gas combustion device. By introducing a catalyst mesh structure during the combustion process and combining it with a mesh structure design, this device optimizes the combustion and oxidative decomposition process of VOCs, not only significantly improving the waste gas treatment efficiency but also effectively reducing energy consumption. Different from traditional technologies, this device combines high-temperature direct combustion with catalytic combustion, achieving a higher degree of combustion completion and adaptability to multiple operating conditions, providing a more environmentally friendly and efficient solution for industrial waste gas treatment.

[0007] To solve the above technical problems, the technical solution of the present invention is as follows:

[0008] A catalyst-enhanced waste gas combustion device includes a burner and a flame guiding wall. The burner is provided with an air inlet end and a flame jet end. The flame guiding wall is arranged on one side of the flame jet end of the burner. The flame guiding wall is arranged along the circumferential direction of the burner. An exhaust gas inlet hole is provided at one end of the flame guiding wall close to the burner. It further includes a catalyst metal mesh, which is fixedly installed inside the end of the flame guiding wall away from the burner. The catalyst metal mesh is located in the outer flame region of the burner. Among them, air and fuel gas are introduced through the air inlet end. The fuel gas is ignited at the flame jet end to form a burning flame. The exhaust gas is guided to the flame area through the exhaust gas inlet hole, contacts the flame during the combustion process, and flows through the catalyst metal mesh. During the waste gas treatment process, by precisely controlling the operating parameters of the burner (such as fuel gas flow rate, air ratio, etc.), the temperature and action range of the flame can be effectively adjusted, making the temperature of the outer flame high-temperature area as high as possible and the coverage range of the high-temperature area as large as possible, so as to ensure that all waste gas can fully pass through the high-temperature area of the outer flame.

[0009] After the catalyst metal mesh is set in the outer flame area of the burner, due to the relatively high temperature in the outer flame area, it helps to accelerate the oxidation reaction of harmful substances in the waste gas and enables the simultaneous progress of high-temperature direct combustion and catalytic combustion processes, thereby improving the waste gas treatment efficiency. At the same time, the high-temperature environment can effectively avoid the risk of traditional catalyst poisoning: under high-temperature conditions, due to the increased kinetic energy of gas molecules, harmful components such as sulfides and chlorides are more difficult to adhere to the catalyst surface through physical adsorption. Even if some harmful components can undergo chemical adsorption, the high temperature also increases the activation energy of chemical adsorption, making it more difficult for these components to form stable chemical bonds with the catalyst surface. Therefore, harmful components are more likely to be carried away by the gas flow or decomposed at high temperature, effectively reducing the possibility of catalyst poisoning and ensuring the long-term stability of the catalyst. Especially for acidic substances (such as SO2, HCl, etc.), high temperature helps to promote their conversion reactions (for example, SO2 will be converted to SO3, and SO3 can further react with water vapor to form sulfuric acid, which is finally removed through a neutralization reaction, while HCl will be converted into harmless salts), avoiding the long-term contact of these acidic substances with the catalyst surface, further reducing the risk of catalyst poisoning, and ensuring the long-term stability and high-efficiency working performance of the catalyst.

[0010] It is worth mentioning that existing waste gas treatment systems usually need to be equipped with pre-filtering devices (such as filters, electrostatic precipitators, and wet scrubbers) to capture large particles in the waste gas to prevent these particles from entering subsequent treatment units (such as regenerators). However, in the solution of the present invention, since the waste gas is directly introduced into the flame of the burner, under the combined action of high-temperature combustion and catalytic combustion, the particles in the waste gas can be effectively decomposed, thereby reducing the chance of their deposition on the surface of the regenerator and avoiding the problem of regenerator blockage. In this way, after using the solution of the present invention, the pre-filtering device can be cancelled, effectively simplifying the waste gas treatment equipment and reducing the cost.

[0011] In order to enable the catalyst metal mesh to adapt to the application directly in a high-temperature flame environment, the present invention proposes the following two preferred solutions:

[0012] The first solution: The catalyst metal mesh includes catalytic metal wires, and the catalyst metal mesh is a mesh structure woven by multiple catalytic metal wires. Different from traditional catalyst devices, traditional catalysts usually rely on ceramic carriers for support, and the catalysts are all sprayed on the ceramic carriers, and the ceramic carriers mostly adopt a honeycomb structure. However, when the ceramic carrier faces thermal shock (in the present invention, it refers to the rapid temperature change caused by the direct combustion of the catalyst metal mesh by the flame), it may easily crack or break due to its inherent brittleness; moreover, the honeycomb ceramic carrier has relatively small and fixed pores, which restricts the airflow more when the air passes through, and such a structure is also prone to accumulate particulate matter and pollutants. Especially when treating waste gas containing more solid particles, this may lead to the blockage of the catalyst layer, so it is not suitable for the use scenario in the present invention. The mesh-structured catalytic metal mesh provides a larger space for the airflow to pass through, and the thermal conductivity of the metal is higher than that of the ceramic. When roasted by the flame, it can ensure that the entire catalyst layer is in a high-temperature state, and then quickly transfer the heat to the harmful substances in the waste gas, which is beneficial to the rapid oxidation and decomposition of particulate matter and other pollutants, effectively avoiding the blockage of the catalyst layer.

[0013] Moreover, compared with the ceramic carrier, the catalyst metal mesh completely woven by catalytic metal wires has higher thermal shock resistance and corrosion resistance, can effectively cope with high temperatures and harsh gas environments, and ensure the durability and catalytic performance of the catalyst during long-term operation; moreover, the catalyst metal mesh is completely made of the catalytic metal itself and is no longer affected by the spraying process, so the catalytic effect is more stable and the service life is longer.

[0014] Preferably, the material of the catalytic metal wire is one or more of platinum (Pt), palladium (Pd), rhodium (Rh), titanium dioxide (TiO2), molybdenum trioxide (MoO3), chromium oxide (Cr2O3), nickel (Ni), copper (Cu), iron (Fe). These materials all have good catalytic performance and can promote the rapid oxidation and decomposition of harmful substances in the waste gas, and can be selected according to the concentration and composition of the waste gas. It should be noted that metals or metal oxides that can be used to treat harmful substances in the waste gas can be used to make the catalyst metal mesh of this device.

[0015] Among them, in order to make the arrangement of the catalytic metal wires adapt to different combustion chamber structures and waste gas types, the present invention further provides the following two preferred solutions:

[0016] Solution A: The catalytic metal wire is made of a single metal material, and the catalyst metal mesh is a one - layer or multi - layer mesh structure woven from the catalytic metal wire. In Solution A, for exhaust gas with relatively simple components, a one - layer or multi - layer catalyst metal mesh woven from catalytic metal wire of a single material can be used, which has a lower cost. The multi - layer distribution method can increase the surface area of the catalyst and improve the catalytic activity. When dealing with exhaust gas with complex components, a multi - layer mesh structure woven from catalytic metal wire of multiple materials can be used, and the material of the catalytic metal wire for each layer will be customized according to the chemical characteristics of VOCs to maximize the catalytic treatment effect.

[0017] It is worth mentioning that since the catalyst metal mesh is woven from catalytic metal wire, the catalyst layer can be adapted to different exhaust gas flow rates and temperature conditions by adjusting the diameter and arrangement spacing of the catalytic metal wire. For example, thinner metal wires and denser arrangement spacing can provide more contact area, increase the contact frequency between pollutants and the catalyst, thereby improving the catalytic conversion efficiency, and are suitable for the treatment of exhaust gas with a small flow rate but a high pollutant concentration; while thicker metal wires and sparser arrangement spacing are suitable for the treatment of exhaust gas with a large flow rate but a low pollutant concentration, which can reduce the pressure loss while ensuring sufficient flow capacity and improve the overall efficiency of the system. Metal wires with a denser arrangement can enhance the heat exchange efficiency and are suitable for the treatment of low - temperature exhaust gas that needs to be heated up quickly; on the contrary, metal wires with a sparser arrangement are suitable for the treatment of high - temperature exhaust gas to reduce the risk of overheating.

[0018] Solution B: The catalytic metal wire is twisted from multiple metal materials, and the catalyst metal mesh is a mesh structure woven from the catalytic metal wire. Solution B enables the catalyst metal mesh to treat exhaust gas with complex components without using a multi - layer structure. This structure can provide diverse catalytic active sites in the same layer, not only improving the overall catalytic efficiency but also being able to treat multiple different types of harmful substances simultaneously, enhancing the broad - spectrum applicability of the catalytic combustion system. Moreover, the twisted structure endows the catalyst layer with higher mechanical strength and thermal shock resistance, enabling it to maintain a stable structure in high - temperature and high - pressure working environments, not easily cracking or deforming. This not only extends the service life of the catalyst but also reduces the risk of blockage caused by structural damage.

[0019] It is worth mentioning that the catalyst metal mesh in Solution B can adjust the wire spacing and twist angle as needed to adapt to more complex exhaust gas components and combustion conditions. The adjustment effect of the wire spacing is the same as that in Solution A; in addition, the feature of this solution is that the catalytic metal wires are composed of multiple metal wires of different materials compounded and twisted. Therefore, the adjustment of the twist angle can change the interaction force between the metal wires, thereby affecting the mechanical strength and thermal stability of the entire catalyst layer. A smaller twist angle can enhance the support between the metal wires and improve the durability of the catalyst layer. This design is particularly suitable for working under high-temperature and high-pressure conditions, ensuring the long-term stability and thermal shock resistance of the catalyst layer; while a larger twist angle helps to increase the elasticity of the catalyst layer, making it more adaptable to temperature changes and mechanical vibrations. In addition, more flow channels formed by a larger twist angle enhance the turbulent effect of the air flow, enabling the exhaust gas to be more evenly distributed in the catalyst layer, increasing the effective contact time between the air flow and the catalyst, and improving the efficiency of the catalytic reaction.

[0020] The second solution: The catalyst metal mesh includes a support metal mesh and a metal catalyst. The support metal mesh is installed inside the flame guiding wall, and the metal catalyst is coated on the support metal mesh. Compared with the first solution, since the metal catalyst is coated on the support metal mesh, when the metal catalyst wears or fails, it is more convenient to replace the metal mesh or re-coat the catalyst, reducing the complexity and cost of maintenance. The support metal mesh can be made of stainless steel or nickel-based alloy.

[0021] Preferably, the material of the metal catalyst is one or more of platinum (Pt), palladium (Pd), rhodium (Rh), titanium dioxide (TiO2), molybdenum trioxide (MoO3), chromium oxide (Cr2O3), nickel (Ni), copper (Cu), iron (Fe). The metal catalyst can use the same material as the catalytic metal wire to promote the rapid oxidation and decomposition of harmful substances in the exhaust gas.

[0022] Preferably, a plurality of exhaust gas inlet holes are provided, and the plurality of exhaust gas inlet holes are arranged in a honeycomb pattern on the flame guiding wall. The honeycomb arrangement of the exhaust gas inlet holes can ensure that the exhaust gas enters the catalyst layer or the combustion chamber more evenly. This design avoids the concentration of air flow in local areas, reduces the phenomenon of air flow short circuit, and ensures the stability and consistency of the air flow in the entire system. At the same time, introducing the exhaust gas in this way can increase its contact area with the flame and improve the catalytic efficiency.

[0023] Among them, the gas outlet end of the exhaust gas inlet hole protrudes from the inner wall of the flame guiding wall. Such a setting reduces the retention and redistribution of the airflow on the inner wall of the guiding wall, which helps to avoid the concentration of the airflow in a local area and ensures the uniform distribution of the airflow throughout the system. Similarly, it also reduces the chance of particulate matter in the exhaust gas adhering to the inner wall of the flame guiding wall and reduces the risk of blockage. It is worth mentioning that the protruding gas outlet end enables the exhaust gas to come into contact with the flame more directly, increases the effective contact area between the exhaust gas and the flame, promotes a more thorough catalytic reaction and combustion process, and improves the overall catalytic efficiency.

[0024] Preferably, it further includes a flame baffle, which is installed inside the flame guiding wall and at one end far from the flame jet end. The flame baffle can block the outer flame, especially when the flame is large, so that the exhaust gas can fully contact the outer flame.

[0025] In summary, such a catalyst-enhanced exhaust gas combustion device optimizes the combustion and oxidative decomposition process of VOCs by introducing a catalyst mesh structure during the combustion process and combining with the mesh structure design. It not only significantly improves the exhaust gas treatment efficiency but also effectively reduces the energy consumption. Different from the traditional technology, this device combines high-temperature direct combustion and catalytic combustion, achieving a higher degree of combustion completion and multi-condition adaptability, providing a more environmentally friendly and efficient solution for industrial exhaust gas treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0027] Figure 1 It is a schematic structural diagram of the catalyst-enhanced exhaust gas combustion device of the present invention;

[0028] Figure 2 It is a schematic structural diagram of a layer of catalyst metal mesh in Embodiment A of the present invention;

[0029] Figure 3 It is a schematic structural diagram of a multi-layer catalyst metal mesh in Embodiment A of the present invention;

[0030] Figure 4 For Figure 3 the cross-sectional view;

[0031] Figure 5 It is a schematic structural diagram of Embodiment B in the present invention;

[0032] Figure 6Schematic structural diagram of Embodiment 2 in the present invention;

[0033] In the figure,

[0034] 1 - Burner;

[0035] 2 - Flame guiding wall;

[0036] 3 - Exhaust gas inlet hole;

[0037] 4 - Catalyst metal mesh; 41 - Catalytic metal wire; 42 - Support metal mesh; 43 - Metal catalyst;

[0038] 5 - Flame baffle;

[0039] 6 - Outer flame. Specific embodiments

[0040] The following further describes the specific embodiments of the present invention in conjunction with the accompanying drawings. It should be noted here that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation to the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0041] Referring to Figure 1 As shown, a catalyst - enhanced exhaust gas combustion device includes a burner 1 and a flame guiding wall 2. The burner 1 is provided with an air inlet end and a flame jet end. The flame guiding wall 2 is arranged on one side of the flame jet end of the burner 1. The flame guiding wall 2 is arranged along the circumferential direction of the burner 1. An exhaust gas inlet hole 3 is provided at one end of the flame guiding wall 2 close to the burner 1. It further includes a catalyst metal mesh 4. The catalyst metal mesh 4 is fixedly installed inside the end of the flame guiding wall 2 away from the burner 1. The catalyst metal mesh 4 is located in the outer flame 6 area of the burner 1. Among them, air and fuel gas are introduced into the air inlet end. The fuel gas is ignited at the flame jet end to form a burning flame. The exhaust gas is guided to the flame area through the exhaust gas inlet hole 3, contacts the flame during the combustion process, and flows through the catalyst metal mesh 4. During the exhaust gas treatment process, by precisely controlling the operating parameters of the burner 1 (such as fuel gas flow rate, air ratio, etc.), the temperature and action range of the flame can be effectively adjusted, so that the temperature of the high - temperature area of the outer flame is as high as possible and the coverage range of the high - temperature area is as large as possible, thereby ensuring that all exhaust gas can fully pass through the high - temperature area of the outer flame 6.

[0042] After the catalyst metal mesh 4 is arranged behind the outer flame 6 area of the burner 1, due to the relatively high temperature in the outer flame 6 area, it helps to accelerate the oxidation reaction of harmful substances in the waste gas, and enables the high-temperature direct combustion and catalytic combustion processes to proceed simultaneously, thereby improving the waste gas treatment efficiency. At the same time, the high-temperature environment can effectively avoid the risk of traditional catalyst poisoning: under high-temperature conditions, due to the increased kinetic energy of gas molecules, harmful components such as sulfides and chlorides are more difficult to adhere to the catalyst surface through physical adsorption. Even if some harmful components can undergo chemical adsorption, the high temperature also increases the activation energy of chemical adsorption, making it more difficult for these components to form stable chemical bonds with the catalyst surface. Therefore, harmful components are more easily carried away or decomposed by the gas flow at high temperature, thus effectively reducing the possibility of catalyst poisoning and ensuring the long-term stability of the catalyst. Especially for acidic substances (such as SO2, HCl, etc.), high temperature helps to promote their conversion reactions (for example, SO2 will be converted to SO3, and SO3 can further react with water vapor to form sulfuric acid, which is finally removed through a neutralization reaction, while HCl will be converted to harmless salts), avoiding the long-term contact of these acidic substances with the catalyst surface, further reducing the risk of catalyst poisoning, and ensuring the long-term stability and high-efficiency working performance of the catalyst.

[0043] It is worth mentioning that existing waste gas treatment systems usually need to be equipped with pre-filtering devices (such as filters, electrostatic precipitators, and wet scrubbers) to capture large particles in the waste gas to prevent these particles from entering subsequent treatment units (such as regenerators). However, in the solution of the present invention, since the waste gas is directly introduced into the flame of the burner 1, under the combined action of high-temperature combustion and catalytic combustion, the particles in the waste gas can be effectively decomposed, thereby reducing the chance of their deposition on the surface of the regenerator and avoiding the problem of regenerator blockage. In this way, after using the solution of the present invention, the pre-filtering device can be cancelled, effectively simplifying the waste gas treatment equipment and reducing the cost.

[0044] In order to enable the catalyst metal mesh 4 to adapt to the application directly in the high-temperature flame environment, the present invention proposes the following two embodiments:

[0045] Embodiment 1: Refer to Figure 2 、 Figure 3 and Figure 4As shown, the catalyst metal mesh 4 includes catalytic metal wires 41, and the catalyst metal mesh 4 is a mesh structure woven by multiple catalytic metal wires 41. Different from traditional catalyst devices, traditional catalysts usually rely on ceramic carriers for support and mostly adopt a honeycomb structure. However, when facing thermal shock (which refers to the rapid temperature change caused by the direct combustion of the catalyst metal mesh 4 by a flame in the present invention), the ceramic carrier may easily crack or break due to its inherent brittleness; moreover, the honeycomb ceramic carrier has relatively small and fixed channels, which restricts the airflow more when the air passes through, and such a structure is also prone to accumulating particulate matter and pollutants. Especially when treating exhaust gas containing more solid particles, this may lead to the blockage of the catalyst layer, so it is not suitable for the use scenario in the present invention. The mesh-structured catalytic metal mesh provides a larger space for the airflow to pass through, and the thermal conductivity of the metal is higher than that of the ceramic. When roasted by the flame, it can ensure that the entire catalyst layer is in a high-temperature state, and then quickly transfer the heat to the harmful substances in the exhaust gas, which is beneficial to the rapid oxidation and decomposition of particulate matter and other pollutants, effectively avoiding the blockage of the catalyst layer.

[0046] Moreover, compared with the ceramic carrier, the catalyst metal mesh 4 completely woven by the catalytic metal wires 41 has higher thermal shock resistance and corrosion resistance, can effectively cope with high temperatures and harsh gas environments, and ensure the durability and catalytic performance of the catalyst during long-term operation; moreover, the catalyst metal mesh is completely made of the catalytic metal itself and is no longer affected by the spraying process, so the catalytic effect is more stable and the service life is longer.

[0047] Among them, the material of the catalytic metal wire 41 is one or more of platinum (Pt), palladium (Pd), rhodium (Rh), titanium dioxide (TiO2), molybdenum trioxide (MoO3), chromium oxide (Cr2O3), nickel (Ni), copper (Cu), iron (Fe). These materials all have good catalytic performance and can promote the rapid oxidation and decomposition of harmful substances in the exhaust gas, and can be selected according to the concentration and composition of the exhaust gas. It should be noted that metals or metal oxides that can be used to treat harmful substances in the exhaust gas can be used to make the catalyst metal mesh 4 of this device.

[0048] Among them, in order to make the arrangement of the catalytic metal wires 41 adapt to different combustion chamber structures and exhaust gas types, the present invention further provides the following two embodiments:

[0049] Embodiment A: Refer to Figure 2 、 Figure 3 and Figure 4As shown, the catalyst metal mesh 4 is a one - layer or multi - layer mesh structure woven from a single catalytic metal wire 41 or a multi - layer mesh structure woven from multiple catalytic metal wires 41. In Solution A, for exhaust gas with relatively single components, a one - layer or multi - layer catalyst metal mesh 4 woven from catalytic metal wires 41 of a single material can be used, which has a lower cost. The multi - layer distribution can increase the surface area of the catalyst and improve the catalytic activity. When dealing with exhaust gas with complex components, a multi - layer mesh structure woven from catalytic metal wires 41 of multiple materials can be used. The material of the catalytic metal wire 41 for each layer will be customized according to the chemical characteristics of VOCs to maximize the catalytic treatment effect.

[0050] It is worth mentioning that since the catalyst metal mesh 4 is woven from catalytic metal wires 41, the catalyst layer can be adapted to different exhaust gas flow rates and temperature conditions by adjusting the diameter and arrangement spacing of the catalytic metal wires 41. For example, thinner metal wires and denser arrangement spacing can provide more contact area, increase the contact frequency between pollutants and the catalyst, and thus improve the catalytic conversion efficiency, which is suitable for the treatment of exhaust gas with a small flow rate but a high pollutant concentration; while thicker metal wires and sparser arrangement spacing are suitable for the treatment of exhaust gas with a large flow rate but a low pollutant concentration, which can reduce the pressure loss while ensuring sufficient flow capacity and improve the overall efficiency of the system. Denser - arranged metal wires can enhance the heat exchange efficiency and are suitable for the treatment of low - temperature exhaust gas that needs to be quickly heated; on the contrary, sparser - arranged metal wires are suitable for the treatment of high - temperature exhaust gas to reduce the risk of overheating.

[0051] The present invention provides a reference scheme for the multi - layer structure woven from multiple catalytic metal wires 41 in Example A to arrange layers based on the difference in the molecular weight of the exhaust gas: The first - layer catalytic metal wire 41 (light - weight VOCs catalyst layer) uses a platinum (Pt) or rhodium (Rh) - based catalyst to specifically treat light - weight VOCs such as formaldehyde and acetaldehyde; the second - layer catalytic metal wire 41 (medium - molecular - weight VOCs catalyst layer) uses a chromium - based (CrO3), titanium - based (TiO2) or molybdenum - based (MoO3) catalyst for medium - molecular - weight VOCs such as toluene and phenol; the third - layer catalytic metal wire 41 (heavy - weight VOCs catalyst layer) uses a nickel (Ni) or copper (Cu) - based catalyst to specifically treat heavy - weight VOCs such as n - hexane and ethyl acetate.

[0052] It should be emphasized that the arrangement method of the catalytic metal wires 41 is not fixed and can be flexibly adjusted according to the specific type and components of the exhaust gas. For example, in some application scenarios, if the content of a certain type of VOCs in the exhaust gas is high, the catalyst layer specifically for this type of component can be increased, or the arrangement order and number of layers of the catalyst layer can be adjusted to optimize the exhaust gas treatment process.

[0053] Example B: Refer to Figure 5 As shown, the catalyst metal mesh 4 is a mesh structure formed by twisting a variety of catalytic metal wires 41. Solution B enables the catalyst metal mesh 4 to treat waste gas with complex components without using a multi-layer structure. This structure can provide diverse catalytic active sites in the same layer, not only improving the overall catalytic efficiency but also simultaneously treating multiple different types of harmful substances, enhancing the broad-spectrum applicability of the catalytic combustion system. Moreover, the twisted structure endows the catalyst layer with higher mechanical strength and thermal shock resistance, enabling it to maintain structural stability in high-temperature and high-pressure working environments, and not easily cracking or deforming. This not only extends the service life of the catalyst but also reduces the risk of blockage caused by structural damage.

[0054] It is worth mentioning that the catalyst metal mesh 4 in Example B can adjust the wire spacing and twist angle as needed to adapt to more complex waste gas components and combustion conditions. The adjustment effect of the wire spacing is the same as that in Example A; in addition, the feature of this embodiment is that the catalytic metal wire 41 is composed of a composite twist of metal wires of multiple different materials. Therefore, the adjustment of the twist angle can change the interaction force between the metal wires, thereby affecting the mechanical strength and thermal stability of the entire catalyst layer. A smaller twist angle can enhance the support between the metal wires and improve the durability of the catalyst layer. This design is particularly suitable for working under high-temperature and high-pressure conditions, ensuring the long-term stability and thermal shock resistance of the catalyst layer; while a larger twist angle helps to increase the elasticity of the catalyst layer, making it more adaptable to temperature changes and mechanical vibrations. In addition, the more flow channels formed by the larger twist angle enhance the turbulent effect of the airflow, enabling the waste gas to be more evenly distributed in the catalyst layer, increasing the effective contact time between the airflow and the catalyst, and improving the efficiency of the catalytic reaction.

[0055] Example 2: Refer to Figure 6 As shown, the catalyst metal mesh 4 includes a support metal mesh 42 and a metal catalyst 43. The support metal mesh 42 is installed inside the flame guiding wall 2, and the metal catalyst 43 is coated on the support metal mesh 42. Compared with the first solution, in the second solution, since the metal catalyst 43 is coated on the support metal mesh 42, when the metal catalyst 43 wears or fails, it is more convenient to replace the metal mesh or re-coat the catalyst, reducing the complexity and cost of maintenance. The support metal mesh 42 can be made of stainless steel or nickel-based alloy.

[0056] Among them, the material of the metal catalyst 43 is one or more of platinum (Pt), palladium (Pd), rhodium (Rh), titanium dioxide (TiO2), molybdenum trioxide (MoO3), chromium oxide (Cr2O3), nickel (Ni), copper (Cu), and iron (Fe). The metal catalyst 43 can use the same material as the catalytic metal wire 41 to promote the rapid oxidation and decomposition of harmful substances in the waste gas.

[0057] Additionally, referring to Figure 1 as shown, there are multiple exhaust gas inlet holes 3, and the multiple exhaust gas inlet holes 3 are arranged in a honeycomb pattern on the flame guiding wall 2. The exhaust gas inlet holes 3 arranged in a honeycomb pattern can ensure that the exhaust gas enters the catalyst layer or the combustion chamber more evenly. This design avoids the concentration of air flow in local areas, reduces the phenomenon of air flow short - circuit, and ensures the stability and consistency of the air flow throughout the system. At the same time, introducing the exhaust gas in this way can increase its contact area with the flame and improve the catalytic efficiency.

[0058] Additionally, the outlet end of the exhaust gas inlet hole 3 protrudes from the inner wall of the flame guiding wall 2. With this setting, the retention and redistribution of the air flow on the inner wall of the guiding wall are reduced, which helps to avoid the concentration of air flow in local areas and ensures the uniform distribution of the air flow throughout the system. Similarly, it also reduces the chance of particulate matter in the exhaust gas adhering to the inner wall of the flame guiding wall 2 and reduces the risk of blockage. It is worth mentioning that the protruding outlet end enables the exhaust gas to come into contact with the flame more directly, increases the effective contact area between the exhaust gas and the flame, promotes a more thorough catalytic reaction and combustion process, and improves the overall catalytic efficiency.

[0059] Additionally, referring to Figure 1 as shown, it further includes a flame baffle 5, and the flame baffle 5 is installed inside the flame guiding wall 2 and at one end away from the flame spraying end. The flame baffle 5 can effectively inhibit the excessive extension of the outer flame 6, especially when the flame is large, so that the exhaust gas can fully contact the outer flame 6.

[0060] In summary, such an exhaust gas combustion device based on catalyst enhancement optimizes the combustion and oxidative decomposition process of VOCs by introducing a catalyst mesh structure during the combustion process and combining with the mesh structure design. It not only significantly improves the exhaust gas treatment efficiency but also effectively reduces the energy consumption. Different from traditional technologies, this device combines high - temperature direct combustion and catalytic combustion, achieving a higher combustion completeness and multi - operating - condition adaptability, providing a more environmentally friendly and efficient solution for industrial exhaust gas treatment. Moreover, the device of the present invention can efficiently catalyze harmful substances in the exhaust gas in a short time, avoiding the catalyst aging problem caused by the long - time high - temperature reaction of traditional RTO equipment, thereby improving the exhaust gas treatment efficiency and reducing the operation cost.

[0061] The above - mentioned embodiments of the present invention have been described in detail in conjunction with the accompanying drawings, but the present invention is not limited to the described embodiments. For those skilled in the art, without departing from the principles and spirit of the present invention, various changes, modifications, substitutions, and variations made to these embodiments still fall within the protection scope of the present invention.

Claims

1. A catalyst-enhanced waste gas combustion device, comprising a burner (1) and a flame guiding wall (2), wherein the burner (1) is provided with an air inlet end and a flame jet end, the flame guiding wall (2) is arranged on one side of the flame jet end of the burner (1), the flame guiding wall (2) is arranged along the circumferential direction of the burner (1), and a waste gas inlet hole (3) is arranged at one end of the flame guiding wall (2) close to the burner (1), and is characterized in that: It further includes a catalyst metal mesh (4), which is fixedly installed inside one end of the flame guiding wall (2) away from the burner (1), and the catalyst metal mesh (4) is located in the outer flame zone of the burner (1).

2. The catalyst-enhanced exhaust gas combustion device according to claim 1, wherein: The catalyst metal mesh (4) includes catalytic metal wires (41), and the catalyst metal mesh (4) is a mesh structure woven by a plurality of catalytic metal wires (41).

3. The catalyst-enhanced exhaust gas combustion device according to claim 2, wherein: The material of the catalytic metal wire (41) is one or more of platinum (Pt), palladium (Pd), rhodium (Rh), titanium dioxide (TiO2), molybdenum trioxide (MoO3), chromium oxide (Cr2O3), nickel (Ni), copper (Cu), and iron (Fe).

4. The catalyst-enhanced waste gas combustion device according to claim 3, wherein: The catalytic metal wire (41) is made of a single metal material, and the catalyst metal mesh (4) is a one-layer or multi-layer mesh structure woven by the catalytic metal wire (41).

5. The catalyst-enhanced exhaust gas combustion device according to claim 3, wherein: The catalytic metal wire (41) is twisted by a variety of metal materials, and the catalyst metal mesh (4) is a mesh structure woven by the catalytic metal wire (41).

6. The catalyst-enhanced exhaust gas combustion device according to claim 1, characterized in that: The catalyst metal mesh (4) includes a support metal mesh (42) and a metal catalyst (43), the support metal mesh (42) is installed inside the flame guiding wall (2), and the metal catalyst (43) is coated on the support metal mesh (42).

7. The catalyst-enhanced exhaust gas combustion device according to claim 6, wherein: The material of the metal catalyst (43) is one or more of platinum (Pt), palladium (Pd), rhodium (Rh), titanium dioxide (TiO2), molybdenum trioxide (MoO3), chromium oxide (Cr2O3), nickel (Ni), copper (Cu), and iron (Fe).

8. The catalyst-enhanced exhaust gas combustion device according to claim 1, wherein: A plurality of waste gas inlet holes (3) are provided, and the plurality of waste gas inlet holes (3) are arranged in a honeycomb shape on the flame guiding wall (2).

9. The catalyst-enhanced exhaust gas combustion device according to claim 8, wherein: The air outlet end of the waste gas inlet hole (3) protrudes from the inner wall of the flame guiding wall (2).

10. The catalyst-enhanced exhaust gas combustion device according to claim 1, wherein: It further includes a flame baffle (5), which is installed inside the flame guiding wall (2) and is located at one end away from the flame jet end.

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