Activated carbon adsorption and desorption catalytic combustion device

Abstract

The utility model discloses an activated carbon adsorption and desorption catalytic combustion device, and belongs to the field of activated carbon adsorption and desorption catalytic combustion. An activated carbon adsorption and desorption catalytic combustion device comprises a combustion chamber provided with a catalytic assembly, a waste gas pipe fixedly connected to the combustion chamber and a heat accumulator fixedly connected to the inner wall of the combustion chamber, and a heat exchange pipe is attached to the inner wall of a groove; the buffer tank is fixedly connected to the outer wall of the combustion chamber, the input end of the buffer tank is communicated with the gas outlet connector of the heat exchange pipe, and the waste gas pipe is communicated with the gas inlet connector of the heat exchange pipe; on one hand, desorbed high-concentration waste gas can be conveyed into the heat exchange pipe, heat generated by the desorbed high-concentration waste gas can be effectively utilized, the phenomenon of heat energy loss is reduced, on the other hand, efficient heat exchange can be achieved through the stainless steel heat exchange pipe and the ceramic heat accumulator, and the heat exchange efficiency is improved. The temperature in the combustion chamber can quickly reach the lowest working temperature, the waiting time of cold start is shortened, and the catalytic combustion efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of activated carbon adsorption-desorption catalytic combustion technology, and in particular to an activated carbon adsorption-desorption catalytic combustion device. Background Technology

[0002] Activated carbon adsorption-desorption catalytic combustion is a thermal destruction method and an environmental protection device widely used in industrial waste gas treatment. It is mainly used to treat low-concentration, high-volume organic waste gas. This technology uses activated carbon to adsorb and enrich the organic matter in the waste gas, and then desorbs and concentrates it before entering the catalytic combustion system for efficient purification, ultimately achieving emission standards.

[0003] In the existing technology, this technology combines the advantages of adsorption enrichment and catalytic combustion. In the adsorption stage, the high specific surface area of ​​activated carbon (such as honeycomb activated carbon) is used to adsorb organic matter in the waste gas. In the desorption stage, when the activated carbon is saturated, it is desorbed by hot air or inert gas (such as nitrogen) to concentrate the organic matter into a high-concentration gas. In the catalytic combustion stage, the concentrated organic waste gas is oxidized into carbon dioxide and water under the action of a catalyst, while releasing heat.

[0004] However, in actual use, it was found that, firstly, the heat generated by the exhaust gas during the desorption process was not effectively utilized, resulting in energy loss; secondly, the cold start time of the catalytic combustion chamber was too long, reducing the catalytic combustion efficiency. Utility Model Content

[0005] The purpose of this invention is to solve the problems in the prior art where the heat generated by the exhaust gas during the desorption process is not effectively utilized and the cold start time of the catalytic combustion chamber is too long, and to propose an activated carbon adsorption-desorption catalytic combustion device.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] An activated carbon adsorption-desorption catalytic combustion device includes a combustion chamber equipped with a catalytic component, an exhaust gas pipe fixedly connected to the combustion chamber, and further includes: a heat storage body fixedly connected to the inner wall of the combustion chamber, wherein the heat storage body has a groove, and a heat exchange tube is disposed in the groove, the heat exchange tube being in contact with the inner wall of the groove; and a buffer tank fixedly connected to the outer wall of the combustion chamber, wherein the input end of the buffer tank is connected to the exhaust port of the heat exchange tube, and the exhaust gas pipe is connected to the inlet port of the heat exchange tube.

[0008] To improve the heat exchange efficiency of the heat exchange tube, the groove is preferably S-shaped.

[0009] To further improve the heat resistance of the heat exchange tube, the heat exchange tube is made of stainless steel.

[0010] In order to store or release heat, the heat storage body is preferably honeycomb in cross-section.

[0011] To facilitate the transport and circulation of exhaust gas and purified gas, preferably, a heat exchange box is also included. The heat exchange box is divided into a first cavity and a second cavity by a partition plate. A connecting pipe connected to the second cavity is provided on the partition plate. The exhaust gas pipe is connected to the first cavity. The first cavity is connected to the combustion cavity of the combustion chamber through an air inlet pipe. The second cavity is connected to the purification cavity of the combustion chamber through an air outlet pipe.

[0012] To facilitate the supply or discharge of gas to the buffer tank, preferably, the exhaust gas pipe is fixedly connected to the inlet of the heat exchange tube via a first pipe, the outlet of the heat exchange tube is fixedly connected to the buffer tank via a second pipe, and the output end of the buffer tank is connected to the inlet pipe via a delivery pipe.

[0013] To facilitate control of the pipeline's flow, preferably, control valves are installed on the exhaust pipe, the first pipeline, the conveying pipe, the inlet pipe, and the outlet pipe.

[0014] To facilitate the catalytic combustion of exhaust gas, preferably, the catalytic assembly includes a catalytic plate fixedly connected in the combustion chamber cavity, and the catalytic plate is disposed between the intake pipe and the exhaust pipe.

[0015] Compared with the prior art, this utility model provides an activated carbon adsorption-desorption catalytic combustion device, which has the following beneficial effects:

[0016] 1. This activated carbon adsorption-desorption catalytic combustion device connects the exhaust gas pipe to the inlet of the heat exchange tube, allowing the high-concentration exhaust gas after desorption to be transported into the heat exchange tube, thereby enabling the utilization of thermal energy from the high-concentration exhaust gas after desorption and reducing heat loss.

[0017] 2. This activated carbon adsorption-desorption catalytic combustion device transfers heat from the exhaust gas pipe to the ceramic heat storage body. Combined with the high-temperature characteristics of the ceramic heat storage body, it can achieve efficient heat exchange, enabling the temperature in the combustion chamber to quickly reach the minimum operating temperature, reducing the waiting time for cold start, improving the combustion efficiency of the exhaust gas in the combustion chamber, and also enabling the ceramic heat storage body to absorb heat.

[0018] The parts of this device not described herein are the same as or can be implemented using existing technologies. On the one hand, this utility model can transport the desorbed high-concentration waste gas into the heat exchange tube, thereby effectively utilizing the heat generated by the desorbed high-concentration waste gas and reducing heat loss. On the other hand, it can also utilize stainless steel heat exchange tubes and ceramic heat storage bodies to achieve efficient heat exchange, enabling the temperature in the combustion chamber to quickly reach the minimum operating temperature, reducing the waiting time for cold starts, and improving catalytic combustion efficiency. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the planar structure of an activated carbon adsorption-desorption catalytic combustion device proposed in this utility model;

[0020] Figure 2 This is a partial structural schematic diagram of an activated carbon adsorption-desorption catalytic combustion device proposed in this utility model;

[0021] Figure 3 This utility model proposes an activated carbon adsorption-desorption catalytic combustion device. Figure 2 A schematic diagram of the structure of part A;

[0022] Figure 4 This is a schematic diagram of the structure of the heat storage body of an activated carbon adsorption-desorption catalytic combustion device proposed in this utility model.

[0023] In the diagram: 1. Combustion chamber; 101. Heater; 2. Heat storage body; 3. Groove; 4. Heat exchange tube; 5. Snap-fit; 6. Catalytic plate; 7. Heat exchange box; 701. Inlet pipe; 702. Outlet pipe; 8. Exhaust pipe; 9. Buffer tank; 10. Pressure gauge; 11. Delivery pipe; 12. First pipeline; 13. Second pipeline. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0025] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0026] In the adsorption stage, activated carbon with its high specific surface area is typically used to adsorb organic matter in the waste gas. In the desorption stage, once the activated carbon is saturated, it is desorbed by hot air or an inert gas (such as nitrogen) to concentrate the organic matter into a high-concentration gas. The high-concentration gas (usually with a temperature between 80-100℃) is then transported through the waste gas pipe 8 to the heat exchange box 7 for heat recovery and utilization, preheating the high-concentration gas. In the catalytic combustion stage, the concentrated organic waste gas is oxidized into carbon dioxide and water under the action of a catalyst, and then discharged into the outside air through the exhaust pipe.

[0027] Example:

[0028] Reference Figures 1-4 An activated carbon adsorption-desorption catalytic combustion device includes a combustion chamber 1 equipped with a catalytic assembly. A temperature sensor is also installed within the combustion chamber 1 to monitor the internal temperature and ensure that the minimum operating temperature of the combustion chamber 1 (typically 250°C) is met. The combustion chamber 1 is used for catalytic combustion of the desorbed high-concentration waste gas. The catalytic assembly includes a catalytic plate 6 fixedly connected within the cavity of the combustion chamber 1, which can be filled with a Pt / Pd catalyst for catalytic reaction of the desorbed high-concentration waste gas. A heater 101 is also installed on the combustion chamber 1, which can be electrically heated. The combustion chamber 1 is ignited by means of ignition or other methods, and the temperature inside the combustion chamber 1 is preheated to a suitable temperature. A ceramic heat storage body 2 is installed on the inner wall of the combustion chamber 1, and the cross-section of the heat storage body 2 is honeycomb. The honeycomb structure can increase the contact area between the ceramic heat storage body 2 and the gas, thereby improving the heat transfer efficiency and making the temperature inside the combustion chamber 1 more uniform. At the same time, an S-shaped groove 3 is opened on the heat storage body 2, and a stainless steel heat exchange tube 4 is installed in the groove 3 by means of a buckle 5. The exhaust pipe 8 is connected to the air inlet of the heat exchange tube 4.

[0029] In the above scheme, the high-concentration exhaust gas after desorption can be transported into the heat exchange tube 4, thereby effectively utilizing the heat generated by the high-concentration exhaust gas after desorption, reducing heat loss. Furthermore, through the stainless steel heat exchange tube 4 with good thermal conductivity, combined with the high-temperature characteristics of the ceramic heat storage body 2, efficient heat exchange can be achieved, allowing the temperature in the combustion chamber 1 to quickly reach the minimum operating temperature, reducing the waiting time for cold start, improving catalytic combustion efficiency, and enabling the ceramic heat storage body 2 to absorb heat from the combustion chamber 1 for subsequent heating.

[0030] The S-shaped groove 3 helps to change the direction of exhaust gas flow and increase the contact time with the inner wall of the heat exchange tube 4, thereby improving the heat exchange effect of the heat exchange tube 4. During this process, the heat from the exhaust pipe 8 will be transferred to the ceramic heat storage body 2. The stainless steel heat exchange tube 4 has good thermal conductivity. Combined with the high temperature characteristics of the ceramic heat storage body 2, efficient heat exchange can be achieved, so that the temperature in the combustion chamber 1 can quickly reach the minimum operating temperature, reduce the waiting time for cold start, improve the catalytic combustion efficiency, and at the same time, the ceramic heat storage body 2 can absorb heat from the combustion chamber 1.

[0031] The heat exchange box 7 is located below the combustion chamber 1. The heat exchange box 7 is divided into a first cavity and a second cavity by a partition plate. A connecting pipe connected to the second cavity is provided on the partition plate. The exhaust pipe 8 is connected to the first cavity. The first cavity is connected to the combustion cavity of the combustion chamber 1 by an inlet pipe 701. The second cavity is connected to the purification cavity of the combustion chamber 1 by an outlet pipe 702. When the high-concentration exhaust gas is catalytically combusted, it can enter the second cavity through the outlet pipe 702, then enter the connecting pipe, and then be discharged through the connecting pipe to reduce environmental pollution. At this time, when the desorbed high-concentration exhaust gas enters the first cavity through the exhaust pipe 8, the connecting pipe can preheat the desorbed high-concentration exhaust gas, reduce the production cost of the enterprise, and allow the desorbed exhaust gas to enter the combustion chamber 1, which is already at the working temperature, for complete combustion.

[0032] A buffer tank 9 is installed on the outer wall of the combustion chamber 1 to temporarily store the gas in the exhaust pipe 8. The internal safety pressure of the buffer tank 9 is 0.1-0.2 MPa, and a pressure gauge 10 is installed on the top of the buffer tank 9 for real-time monitoring of the internal pressure. The distance between the buffer tank 9 and the combustion chamber 1 is less than or equal to five meters to reduce heat loss. The combustion chamber 1 typically requires the heater 101 to heat up for twenty minutes after a cold start to reach the 250°C standard. During this process, the gas transported by the exhaust pipe 8 can be temporarily stored in the cavity of the buffer tank 9. The system maintains a stationary state. For example, when the waste gas treatment capacity is 10,000 m³ / h, the buffer tank 9 can be 40 m³ in volume to temporarily store the waste gas. The waste gas pipe 8 is fixedly connected to the inlet port of the heat exchange pipe 4 through the first pipe 12, and the outlet port of the heat exchange pipe 4 is fixedly connected to the buffer tank 9 through the second pipe 13. The output end of the buffer tank 9 is connected to the inlet pipe 701 through the delivery pipe 11, and the catalytic plate 6 is set between the inlet pipe 701 and the outlet pipe 702 to catalyze the desorbed waste gas.

[0033] Control valves are installed on the exhaust pipe 8, the first pipe 12, the conveying pipe 11, the inlet pipe 701, and the outlet pipe 702 to control the passage of the pipes.

[0034] When the cavity of combustion chamber 1 is cold-started and heated, the valve on the exhaust pipe 8 is closed first, and then the valve on the first pipe 12 is opened. During this process, the heat of the exhaust gas is transferred to the heat exchange pipe 4, and then transferred to the buffer tank 9 through the outlet of the heat exchange pipe 4. Both the first pipe 12 and the second pipe 13 are equipped with one-way valves. At this time, the heat exchange pipe 4 will generate heat to heat the combustion chamber 1, while storing gas in the buffer tank 9.

[0035] When the cavity of combustion chamber 1 is heated to the working temperature, the temperature sensor can monitor it in real time. At this time, the valve of exhaust pipe 8 is opened and the valve of the first pipe 12 is closed, and the exhaust gas enters the heat exchange box 7. Then, the valves of the inlet pipe 701, outlet pipe 702 and delivery pipe 11 are opened. An air pump is also installed on the delivery pipe 11. The air pump can deliver the exhaust gas stored in the buffer tank 9 to the inlet pipe 701 to improve the combustion efficiency of the exhaust gas.

[0036] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. An activated carbon adsorption-desorption catalytic combustion device, comprising a combustion chamber (1) equipped with a catalytic component, wherein an exhaust gas pipe (8) is fixedly connected to the combustion chamber (1), characterized in that, Also includes: A heat storage body (2) is fixedly connected to the inner wall of the combustion chamber (1). The heat storage body (2) has a groove (3) and a heat exchange tube (4) is provided in the groove (3). The heat exchange tube (4) is in contact with the inner wall of the groove (3). A buffer tank (9) is fixedly connected to the outer wall of the combustion chamber (1). The input end of the buffer tank (9) is connected to the outlet of the heat exchange tube (4), and the exhaust pipe (8) is connected to the inlet of the heat exchange tube (4).

2. The activated carbon adsorption-desorption catalytic combustion device according to claim 1, characterized in that, The groove (3) has an S-shaped structure.

3. The activated carbon adsorption-desorption catalytic combustion device according to claim 2, characterized in that, The heat exchange tube (4) is made of stainless steel.

4. The activated carbon adsorption-desorption catalytic combustion device according to claim 1, characterized in that, The heat storage body (2) has a honeycomb cross-section.

5. The activated carbon adsorption-desorption catalytic combustion device according to claim 1, characterized in that, It also includes a heat exchange box (7), in which a first cavity and a second cavity are formed by a partition plate. A connecting pipe connected to the second cavity is provided on the partition plate. The exhaust pipe (8) is connected to the first cavity. The first cavity is connected to the combustion cavity of the combustion chamber (1) through an air inlet pipe (701). The second cavity is connected to the purification cavity of the combustion chamber (1) through an exhaust pipe (702).

6. The activated carbon adsorption-desorption catalytic combustion device according to claim 5, characterized in that, The exhaust pipe (8) is fixedly connected to the air inlet of the heat exchange pipe (4) via the first pipe (12), the air outlet of the heat exchange pipe (4) is fixedly connected to the buffer tank (9) via the second pipe (13), and the output end of the buffer tank (9) is connected to the air inlet pipe (701) via the delivery pipe (11).

7. An activated carbon adsorption-desorption catalytic combustion device according to claim 5 or 6, characterized in that, Control valves are installed on the exhaust pipe (8), the first pipe (12), the conveying pipe (11), the inlet pipe (701), and the outlet pipe (702).

8. The activated carbon adsorption-desorption catalytic combustion device according to claim 1, characterized in that, The catalytic assembly includes a catalytic plate (6) fixedly connected in the cavity of the combustion chamber (1), and the catalytic plate (6) is disposed between the intake pipe (701) and the exhaust pipe (702).

Images