Organic waste gas catalytic combustion furnace

Abstract

This utility model discloses an organic waste gas catalytic combustion furnace, relating to the field of waste gas treatment technology. It includes a furnace body with an air inlet at the bottom and an air outlet at the top. A primary heating device and a compensating heating device are sequentially arranged within the furnace body along the gas flow direction. Catalyst layers are respectively arranged downstream of the primary and compensating heating devices on the furnace body. A flow equalizer is arranged on the furnace body upstream of the primary heating device, with the primary heating devices evenly distributed at the air outlet of the flow equalizer. This utility model improves the combustion rate and reduces treatment energy consumption.

Description

Technical Field

[0001] This utility model relates to the field of waste gas treatment technology, and in particular to a catalytic combustion furnace for organic waste gas. Background Technology

[0002] Industries such as metallurgy, chemical engineering, petroleum, waste incineration, and vehicle exhaust treatment generate organic waste gas. Direct emission of this organic waste gas pollutes the environment and harms human health, necessitating harmless treatment. Traditional methods for treating organic waste gas mainly fall into two categories. One is adsorption, which uses adsorption materials to directly adsorb VOCs and other pollutants from the waste gas, achieving removal. However, this method is inefficient, consumes a lot of resources, and poses secondary pollution problems. The other is combustion, which involves secondary combustion of the organic components in the waste gas, converting them into CO2 and H2O while generating secondary combustion heat. However, this method is primarily designed for high-concentration organic waste gas. When treating low-concentration organic waste gas, it requires a large amount of auxiliary fuel, has a high start-up temperature, and consumes a lot of energy.

[0003] Based on the above situation, catalytic combustion technology gradually emerged. Its core method is to utilize the catalytic effect of catalysts such as platinum and palladium to enhance the activity of organic components and reduce the combustion temperature. While this technology achieves good economic efficiency, the catalytic combustion process requires high precision in temperature control and catalytic contact area. Currently common catalytic combustion furnaces primarily involve heating the waste gas to the catalytic temperature, such as 200℃~400℃, and then passing the high-temperature waste gas through a catalyst layer for catalytic combustion. Although this equipment has a simple structure and low cost, the actual heating process results in significant heat loss, leading to high energy costs over long-term use. Furthermore, the small catalytic contact area results in incomplete reactions, leaving hazardous waste components in the exhaust gas. Therefore, the inventors designed an organic waste gas catalytic combustion furnace to improve the combustion rate and reduce energy consumption, thereby addressing the aforementioned issues. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide an organic waste gas catalytic combustion furnace that improves combustion rate and reduces energy consumption.

[0005] To solve the above-mentioned technical problems, the technical solution of this utility model is: an organic waste gas catalytic combustion furnace, including a furnace body, wherein the furnace body is provided with an air inlet at the lower part and an air outlet at the upper part, a primary heating device and a compensation heating device are arranged sequentially along the gas flow direction in the furnace body, and a catalyst layer is respectively provided downstream of the primary heating device and the compensation heating device in the furnace body; a flow equalizer is provided on the furnace body upstream of the primary heating device, and the primary heating devices are evenly distributed at the air outlet position of the flow equalizer.

[0006] As a preferred technical solution, the flow equalizer includes a flow equalization plate, and the flow equalization plate has a plurality of air passage holes.

[0007] As a preferred technical solution, the air inlet is located on the side wall of the furnace body, and the diameter of the air passage holes on the flow equalization plate gradually increases in the direction away from the air inlet.

[0008] As a preferred technical solution, the primary heating device includes a plurality of primary heating tubes arranged in parallel within the furnace body.

[0009] As a preferred technical solution, a heat exchange structure is also provided in the furnace body upstream of the primary heating tube.

[0010] As a preferred technical solution, the compensating heating device includes a compensating heating tube.

[0011] As a preferred technical solution, a temperature detection device is provided inside the furnace body at the location of the compensating heating device.

[0012] Due to the adoption of the above technical solution, the organic waste gas catalytic combustion furnace includes a furnace body. The furnace body has an inlet at the bottom and an outlet at the top. A primary heating device and a compensating heating device are sequentially arranged within the furnace body along the gas flow direction. Catalyst layers are respectively arranged downstream of the primary heating device and the compensating heating device. A flow equalizer is arranged on the furnace body upstream of the primary heating device, and the primary heating devices are evenly distributed at the outlet positions of the flow equalizer. In this invention, the waste gas entering from the inlet first achieves airflow uniformity through the flow equalizer. The uniformly distributed airflow then passes through the primary heating device and is uniformly heated, reaching a low-order temperature for catalytic combustion, such as 200°C. Then, the airflow passes through the catalyst layer for the first time, undergoing combustion under catalytic action. The waste gas undergoes a temperature change due to the combined effects of combustion heat release and heat loss. The compensating heating device then provides compensating heating, raising the airflow to a high-order temperature for catalytic combustion, such as 320°C. The airflow then passes through the catalyst layer a second time for secondary catalytic combustion. Therefore, by using progressive heating, the heat loss caused by one-time high-temperature heating can be reduced, and the heat from the first combustion can be used for subsequent complete catalytic combustion, which reduces the energy consumption of the process. In addition, the catalytic contact area is large, and the required catalytic combustion temperature can be maintained at each catalyst layer, thereby improving the combustion rate. Attached Figure Description

[0013] The following figures are intended only to illustrate and explain the present invention and do not limit the scope of the present invention. Wherein:

[0014] Figure 1 This is a cross-sectional structural schematic diagram of an embodiment of the present utility model;

[0015] Figure 2 yes Figure 1 A schematic diagram of the AA structure;

[0016] Figure 3 yes Figure 1 A schematic diagram of the BB structure.

[0017] In the diagram: 1-furnace body; 11-air inlet; 12-air outlet; 2-flow equalizer; 21-flow equalizer plate; 22-air vent; 3-primary heating device; 31-primary heating tube; 32-heat exchange structure; 4-compensation heating device; 5-catalyst layer; 6-temperature detection device. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the following detailed description, only certain exemplary embodiments of the present invention are described by way of illustration. Undoubtedly, those skilled in the art will recognize that various modifications can be made to the described embodiments without departing from the spirit and scope of the present invention. Therefore, the drawings and description are illustrative in nature and not intended to limit the scope of the claims.

[0019] like Figure 1 , Figure 2 and Figure 3 As shown, the catalytic combustion furnace for organic waste gas includes a furnace body 1. The furnace body 1 has an air inlet 11 at its lower part and an air outlet 12 at its upper part. A primary heating device 3 and a compensating heating device 4 are sequentially arranged inside the furnace body 1 along the gas flow direction. A catalyst layer 5 is respectively provided downstream of the primary heating device 3 and the compensating heating device 4 on the furnace body 1. Conventionally, the catalyst layer 5 is a honeycomb structure made of commonly used platinum, palladium, etc. A flow equalizer 2 is provided on the furnace body 1 upstream of the primary heating device 3, and the primary heating devices 3 are evenly distributed at the air outlet positions of the flow equalizer 2.

[0020] The exhaust gas entering through the inlet 11 first undergoes airflow equalization via the flow equalizer 2. This equalized airflow is then uniformly heated by the primary heating device 3, reaching a low-order temperature for catalytic combustion, such as 200°C. The airflow then passes through the catalyst layer 5 for the first time, undergoing combustion under catalytic action. This combustion process involves the oxidation and combustion of some organic components into CO2 and H2O, and the decomposition of others into smaller organic molecules. The exhaust gas undergoes a temperature change due to the combined effects of combustion heat release and heat loss. The compensating heating device 4 then provides compensating heating, raising the airflow to a high-order temperature for catalytic combustion, such as 320°C. The airflow then passes through the catalyst layer 5 a second time for secondary catalytic combustion, where all remaining organic components are completely oxidized and burned. This progressive heating reduces heat loss from the initial high-temperature heating and utilizes the heat from the first combustion for subsequent complete catalytic combustion, reducing energy consumption. Furthermore, the large catalytic contact area ensures that each catalyst layer 5 maintains the required catalytic combustion temperature, improving the combustion rate.

[0021] The flow equalizer 2 includes a flow equalizer plate 21 with several air passage holes 22 to disperse the input airflow into a uniform flow, facilitating uniform and rapid heating. In this embodiment, the air inlet 11 is located on the side wall of the furnace body 1, and the diameter of the air passage holes 22 on the flow equalizer plate 21 gradually increases in the direction away from the air inlet 11. The flow equalizer plate 21 mainly serves to obstruct the airflow and limit the airflow in a certain area. By setting different hole diameters, the airflow near the air inlet 11 can be limited, while the airflow away from the air inlet 11 can be increased, thus achieving uniform airflow to the primary heating device 3 and other locations. Of course, when the air outlet 12 is also located on the side wall of the furnace body 1, a similar flow equalizer 2 is also provided downstream of the last catalyst layer 5 to cooperate with the upstream flow equalizer 2, ensuring that the airflow passing through each heating device and catalyst layer 5 remains uniform, promoting improved combustion rate.

[0022] The primary heating device 3 includes several primary heating tubes 31 arranged in parallel within the furnace body 1. That is, the primary heating device 3 uses electric heating tubes for heating, which is a well-known technology in the field, and the structural principle will not be described in detail here. By arranging them in parallel, uniform distribution at the air outlet of the flow equalizer 2 is achieved; if necessary, multiple layers of primary heating tubes 31 can be arranged in parallel to improve the rapid heating effect.

[0023] Preferably, a heat exchange structure 32 is provided inside the furnace body 1 upstream of the primary heating tube 31 to preheat the waste gas using the heat from other high-heat media, thereby improving the thermal energy utilization rate. This heat exchange structure 32 can be a heat exchange tube installed inside the furnace body 1, through which airflow, such as that output from the outlet 12 in this embodiment, can flow, achieving waste heat utilization.

[0024] The compensating heating device 4 includes compensating heating tubes. Based on the gas flow temperature after primary catalytic combustion, it further heats the gas flow to the required higher temperature, fully utilizing the catalytic exothermic effect and reducing power input. Therefore, the number of compensating heating tubes can be relatively small. Preferably, a temperature detection device 6 is provided inside the furnace body 1 at the location of the compensating heating device 4. The detected temperature serves as the basis for determining the input power of the compensating heating device 4. More specifically, if the temperature at the compensating heating device 4 is high, the input power of the compensating heating device 4 is reduced; conversely, the input power is increased. Based on the simple compensating heating function of the compensating heating device 4, in actual installation, the compensating heating device 4 can be configured with two or more stages to extend the gas flow path, further increase the catalytic contact area, and improve the combustion rate without significantly increasing energy consumption.

[0025] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. An organic waste gas catalytic combustion furnace, comprising a furnace body, a gas inlet being arranged at the lower part of the furnace body and a gas outlet being arranged at the upper part of the furnace body, characterized in that: The furnace body is provided with a primary heating device and a compensation heating device in sequence along the gas flow direction. The furnace body is provided with a catalyst layer downstream of the primary heating device and the compensation heating device. The furnace body is provided with a flow equalizer upstream of the primary heating device. The primary heating devices are evenly distributed at the air outlet of the flow equalizer.

2. The organic waste gas catalytic combustion furnace according to claim 1, wherein: The flow equalizer includes a flow equalization plate, and the flow equalization plate has a plurality of air passage holes.

3. The catalytic combustion furnace for organic waste gas as described in claim 2, characterized in that: The air inlet is located on the side wall of the furnace body, and the diameter of the air passage holes on the flow equalization plate gradually increases in the direction away from the air inlet.

4. The catalytic combustion furnace for organic waste gas as described in claim 1, characterized in that: The primary heating device includes several primary heating tubes arranged in parallel within the furnace body.

5. The catalytic combustion furnace for organic waste gas as described in claim 4, characterized in that: A heat exchange structure is also provided in the furnace body upstream of the primary heating tube.

6. The catalytic combustion furnace for organic waste gas as described in claim 1, characterized in that: The compensating heating device includes a compensating heating tube.

7. The catalytic combustion furnace for organic waste gas as described in any one of claims 1 to 6, characterized in that: A temperature detection device is installed inside the furnace at the location of the compensation heating device.

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