A gas catalytic combustion treatment device equipped with a catalyst
By introducing a preheating catalytic box, a ceramic catalytic preheating plate, and a reverse blowing cleaning system into the gas catalytic combustion treatment device, the problems of low combustion efficiency and easy catalyst contamination in the existing device have been solved, achieving efficient gas utilization and heat recovery.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- LIUPANSHUI NORMAL UNIV
- Filing Date
- 2023-08-21
- Publication Date
- 2026-05-29
AI Technical Summary
Existing gas catalytic combustion treatment devices have low combustion efficiency, require frequent catalyst replenishment, and lack effective cleaning devices, resulting in low utilization of low-concentration gas and waste of resources.
A gas catalytic combustion treatment device with a catalyst was designed, including a preheating catalytic box, a catalytic preheating plate, and heat exchange tubes. The preheating catalytic box is connected to the combustion chamber, and the heat of the combustion chamber is used to preheat the catalyst. The catalyst is fixed by a ceramic catalytic preheating plate and an attachment net, and dust is removed by a reverse blowing ash removal pipe. Multiple heat exchange tubes are set to improve efficiency.
It improves the combustion rate and catalytic efficiency of gas, ensures the stability and uniform preheating of the catalyst, reduces dust adhesion to the catalyst, and enhances the operational stability and heat recovery efficiency of the unit.
Smart Images
Figure CN117029016B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of gas treatment devices, specifically a gas catalytic combustion treatment device containing a catalyst. Background Technology
[0002] Coal mine gas is generally classified into three types based on its extraction method: surface-extracted coalbed methane, underground-exhausted coalbed methane, and coal mine exhaust gas. Surface-extracted coalbed methane has a higher concentration and is generally transported and utilized through compression (CNG) or liquefaction (LNG). Underground-exhausted coalbed methane contains a portion with a high concentration, exceeding 30% methane content, which can be used directly as fuel or purified. However, a significant portion is low-concentration methane with a methane concentration below 30%, close to the methane explosion limit (5-15%), making it highly explosive and unstable, resulting in very low utilization. Furthermore, mining areas also have a large amount of exhaust gas with a concentration below 0.75%, which is generally discharged directly into the atmosphere without treatment, causing significant resource waste.
[0003] Furthermore, methane's greenhouse effect is 21 times that of carbon dioxide, and emissions from coal mine exhaust gas and low-concentration methane also significantly exacerbate the atmospheric greenhouse effect. Developing safe and efficient technologies for utilizing low-concentration methane and coal mine exhaust gas can not only achieve resource recycling but also reduce greenhouse gas emissions in mining areas, possessing significant social and economic benefits. While low-concentration methane cannot be directly burned, it can be catalyzed using catalysts. This catalytic process generates a large amount of heat energy, which can be recovered and utilized.
[0004] Currently, most existing gas catalytic combustion treatment devices still suffer from low combustion efficiency and the need for frequent catalyst replenishment. For example, Chinese patent application number 201810152039.3 discloses a device for utilizing the thermal energy of catalytic combustion of low-concentration coal mine gas. This device incorporates a catalytic combustion exhaust heat recovery heat exchanger to preheat the low-concentration gas and recover the high-temperature heat energy from the catalytic flue gas. However, due to the low residual heat in the exhaust, the heat recovered by the heat recovery heat exchanger is often insufficient to preheat the low-concentration catalyst and gas to the ideal temperature, resulting in low catalytic efficiency and a relatively low final gas combustion rate. Furthermore, this patent lacks a catalyst cleaning device, leading to a large amount of dust adhering to the catalyst surface after prolonged use, which affects the gas catalytic efficiency.
[0005] Therefore, there is an urgent need for a new type of gas catalytic combustion treatment device equipped with a catalyst, which can provide a good solution to the shortcomings of existing technologies. Summary of the Invention
[0006] The purpose of this invention is to provide a gas catalytic combustion treatment device containing a catalyst to solve the problems mentioned in the background art.
[0007] To achieve the above objectives, the present invention provides the following technical solution:
[0008] A gas catalytic combustion treatment device containing a catalyst includes a combustion chamber. A heat exchange tube is installed on the top of the combustion chamber. The left and right ends of the heat exchange tube are respectively connected to an outlet pipe and an inlet pipe. Multiple preheating catalytic boxes are installed on the front side of the combustion chamber. A catalytic preheating plate is installed inside the preheating catalytic box. Multiple vertically penetrating vents are distributed on the catalytic preheating plate. A catalyst is placed in each vent. The lower end of each vent is connected to a gas inlet pipe. The end of the gas inlet pipe away from the preheating catalytic box is connected to a gas main inlet pipe. The upper end of each vent is connected to a gas supply pipe. The end of the gas supply pipe away from the preheating catalytic box is connected to the combustion chamber. An air inlet is installed on the right end of the combustion chamber, and an exhaust port is installed on the left end of the combustion chamber.
[0009] Furthermore, the preheating catalytic box has a catalytic box opening at one end facing the combustion chamber, and multiple combustion chamber openings are provided on the front side wall of the combustion chamber. The combustion chamber openings are connected to the catalytic box openings, and a "U"-shaped preheating channel is formed between the outer walls of the catalytic preheating plate and the side walls of the preheating catalytic box.
[0010] Furthermore, the upper end of the vent is connected to the gas supply pipe via a gas cover, and the lower end of the vent is connected to the gas inlet pipe via a gas cover.
[0011] Furthermore, an attachment mesh is fixedly installed in the pores, and the catalyst is fixed on the attachment mesh.
[0012] Furthermore, the catalytic preheating plate is made of ceramic material.
[0013] Furthermore, a reverse blowing cleaning pipe is connected to the connection end of the gas supply pipe and the preheating catalytic box. The port of the reverse blowing cleaning pipe is vertically downward. A first solenoid valve is installed on the reverse blowing cleaning pipe, and a second solenoid valve is installed on the gas supply pipe.
[0014] Furthermore, the end of the reverse blowing cleaning pipe away from the preheating catalytic box is connected to the cleaning blowing main pipe.
[0015] Furthermore, the heat exchange tubes are configured as multiple tubes, and the ends of the multiple heat exchange tubes are connected to the liquid outlet pipe or the liquid inlet pipe.
[0016] Furthermore, the heat exchange tube has an S-shaped structure.
[0017] Compared with the prior art, the beneficial effects of the present invention are:
[0018] 1. In this invention, the preheating catalytic box is connected to the combustion chamber. The heat generated by combustion in the combustion chamber is absorbed by the heat exchange tube on the one hand, and preheats the preheating catalytic box on the other hand. The catalytic efficiency of the catalyst after high-temperature preheating is improved, and the gas combustion rate is improved accordingly.
[0019] 2. In this invention, multiple preheating catalytic boxes are set up so that the normal operation of the device is not affected when a single preheating catalytic box is under maintenance.
[0020] 3. In this invention, a U-shaped preheating channel is formed between the outer walls of the catalytic preheating plate and the side walls of the preheating catalytic box, so that the catalytic preheating plate is preheated evenly and the catalytic efficiency is stable.
[0021] 4. In this invention, the catalyst is fixed on the attachment mesh, which greatly improves the dispersion of the catalyst in the pores, increases the probability of the catalyst coming into contact with the gas, and thus improves the catalytic effect.
[0022] 5. In this invention, the catalytic preheating plate is made of ceramic material, which has a large heat storage capacity, which is conducive to maintaining a stable temperature and ensuring that the catalyst works close to the optimal temperature; in addition, the ceramic material catalytic preheating plate is also easier to clean.
[0023] 6. In this invention, the first solenoid valve and the second solenoid valve are used to control the opening and closing of the reverse blowing cleaning pipe and the gas supply pipe, respectively. When the preheating catalytic box needs to be cleaned, the reverse blowing cleaning pipe connected to the box is opened and the gas supply pipe is closed. The dust attached to the catalyst surface is removed by the high-speed reverse blowing airflow through the air hole.
[0024] 7. In this invention, multiple heat exchange tubes pass through the heat exchange medium simultaneously, which can improve the heat exchange efficiency; the S-shaped heat exchange tubes have a large heat conduction area, which can further improve the heat exchange efficiency. Attached Figure Description
[0025] Figure 1 This is a schematic diagram of a gas catalytic combustion treatment device containing a catalyst;
[0026] Figure 2 This is a schematic diagram of the piping connection structure for multiple preheating catalytic converters;
[0027] Figure 3 This is a schematic diagram of the structure of a single preheating catalytic converter;
[0028] Figure 4 This is an exploded structural diagram of a single preheating catalytic converter.
[0029] Figure 5 This is a schematic diagram of the top structure of the preheating catalytic converter;
[0030] Figure 6 This is a schematic diagram of the catalytic preheating plate.
[0031] Figure 7 for Figure 6 A partial single-point diagram at point K in the middle;
[0032] Figure 8 This is a schematic diagram of the combustion chamber structure;
[0033] Figure 9 This is a schematic diagram of the heat exchange tube structure.
[0034] In the diagram: 1. Combustion chamber; 2. Air inlet; 3. Exhaust outlet; 4. Heat exchanger tube; 5. Liquid inlet pipe; 6. Liquid outlet pipe; 7. Combustion chamber opening; 8. Preheating catalytic converter; 9. Catalytic converter opening; 10. Preheating channel; 11. Catalytic preheating plate; 12. Vent; 13. Attachment mesh; 14. Gas hood; 15. Gas supply pipe; 16. Second solenoid valve; 17. Reverse blowing cleaning pipe; 18. First solenoid valve; 19. Cleaning blowing main pipe; 20. Gas inlet main pipe; 21. Gas inlet pipe. Detailed Implementation
[0035] Example 1: Please refer to Figures 1-9 A gas catalytic combustion treatment device containing a catalyst includes a combustion chamber 1. A heat exchange tube 4 is installed on the top of the combustion chamber 1. The left and right ends of the heat exchange tube 4 are respectively connected to an outlet pipe 6 and an inlet pipe 5. Multiple preheating catalytic boxes 8 are installed on the front side of the combustion chamber 1. A catalytic preheating plate 11 is installed inside the preheating catalytic box 8. Multiple vertically penetrating vents 12 are distributed on the catalytic preheating plate 11. A catalyst is placed inside the vents 12. The lower end of the vents 12 is connected to a gas inlet pipe 21. The end of the gas inlet pipe 21 away from the preheating catalytic box 8 is connected to a gas inlet main pipe 20. The upper end of the vents 12 is connected to a gas supply pipe 15. The end of the gas supply pipe 15 away from the preheating catalytic box 8 is connected to the combustion chamber 1. An air inlet 2 is installed on the right end of the combustion chamber 1, and an exhaust port 3 is installed on the left end of the combustion chamber 1.
[0036] Working principle of this embodiment:
[0037] During operation, low-concentration methane gas is fed into the preheating catalytic converter 8 through the methane inlet pipe 21. After being catalyzed by the catalyst, it is sent to the combustion chamber 1 through the methane supply pipe 15 for combustion. The heat generated by the methane combustion is absorbed by the medium in the heat exchange pipe 4, achieving effective utilization of the low-concentration methane gas. The air inlet 2 is used to introduce air into the combustion chamber 1, and the exhaust port 3 is used to discharge the combusted gas. The catalyst in the preheating catalytic converter 8 is distributed in the pores 12 in the preheating plate 11. When the methane gas passes through, it is catalyzed by the catalyst, promoting the combustion reaction. The preheating catalytic converter 8 is connected to the combustion chamber 1. The heat generated by the combustion in the combustion chamber 1 is absorbed by the heat exchange pipe 4 on the one hand, and preheats the preheating catalytic converter 8 on the other hand. The catalytic efficiency of the catalyst is improved after high-temperature preheating, and the methane combustion rate is improved accordingly. In this embodiment, the catalyst used for the methane gas can be of various types, such as supported catalysts, platinum group metal catalysts, transition metal oxide catalysts, noble metal membrane catalysts, etc. In this embodiment, multiple preheating catalytic converters 8 are set up. When a single preheating catalytic converter 8 is under maintenance, it will not affect the normal operation of the device.
[0038] Example 2: Please refer to Figure 4 and 8 A gas catalytic combustion treatment device containing a catalyst, which differs from Example 1 in that the preheating catalytic box 8 is provided with a catalytic box opening 9 at one end facing the combustion chamber 1, and multiple combustion chamber openings 7 are provided on the front side wall of the combustion chamber 1. The combustion chamber openings 7 are connected to the catalytic box openings 9, and a "U"-shaped preheating channel 10 is formed between the outer walls of the catalytic preheating plate 11 and the side walls of the preheating catalytic box 8.
[0039] In this embodiment, a U-shaped preheating channel 10 is formed between the outer walls of the catalytic preheating plate 11 and the side walls of the preheating catalytic box 8, so that the catalytic preheating plate 11 is preheated evenly and the catalytic efficiency is stable.
[0040] Example 3: Please refer to Figure 4 A gas catalytic combustion treatment device containing a catalyst, which differs from Example 1 in that the upper end of the vent 12 is connected to the gas supply pipe 15 through the gas cover 14, and the lower end of the vent 12 is connected to the gas inlet pipe 21 through the gas cover 14.
[0041] In this embodiment, the gas hood 14 is used to concentrate or disperse the gas, so that the gas passes evenly through each gas hole 12 in the catalytic preheating plate 11.
[0042] Example 4: Please refer to Figure 6 A gas catalytic combustion treatment device containing a catalyst, which differs from Example 1 in that an attachment net 13 is fixedly installed in the pore 12, and the catalyst is fixed on the attachment net 13.
[0043] In this embodiment, the catalyst is fixed on the attachment mesh 13, which greatly improves the dispersion of the catalyst in the pores 12, increases the probability of the catalyst coming into contact with the gas, and thus improves the catalytic effect.
[0044] Example 5: Please refer to Figure 4 A gas catalytic combustion treatment device containing a catalyst, which differs from Example 1 in that the catalytic preheating plate 11 is made of ceramic material.
[0045] In this embodiment, the catalytic preheating plate 11 is made of ceramic material, which has a large heat storage capacity, which is conducive to maintaining a stable temperature and ensuring that the catalyst works close to the optimal temperature; in addition, the ceramic material catalytic preheating plate 11 is also easier to clean.
[0046] Example 6: Please refer to Figures 3-5 A gas catalytic combustion treatment device containing a catalyst differs from Embodiment 1 in that the gas supply pipe 15 is connected to the preheating catalytic box 8 by a reverse blowing cleaning pipe 17. The reverse blowing cleaning pipe 17 has its port pointing vertically downward. A first solenoid valve 18 is installed on the reverse blowing cleaning pipe 17, and a second solenoid valve 16 is installed on the gas supply pipe 15.
[0047] In this embodiment, the first solenoid valve 18 and the second solenoid valve 16 are used to control the opening and closing of the reverse blowing cleaning pipe 17 and the gas supply pipe 15, respectively. When the preheating catalytic box 8 needs to be cleaned, the reverse blowing cleaning pipe 17 connected to the box is opened and the gas supply pipe 15 is closed. The dust attached to the catalyst surface is removed by the high-speed back-blowing airflow in the air hole 12.
[0048] Example 7: Please refer to Figure 1 A gas catalytic combustion treatment device containing a catalyst, which differs from Example 6 in that the reverse blowing ash removal pipe 17 is connected to the ash removal blowing main pipe 19 at the end away from the preheating catalytic box 8.
[0049] In this embodiment, the main cleaning air pipe 19 is connected to a compressor pump, which supplies high-pressure gas into the reverse air cleaning pipe 17.
[0050] Example 8: Please refer to Figure 9 A gas catalytic combustion treatment device containing a catalyst, which differs from Example 1 in that multiple heat exchange tubes 4 are provided, and the ends of the multiple heat exchange tubes 4 are connected to the liquid outlet pipe 6 or the liquid inlet pipe 5.
[0051] In this embodiment, multiple heat exchange tubes 4 pass through the heat exchange medium simultaneously, which can improve the heat exchange efficiency.
[0052] Example 9: Please refer to Figure 9 A gas catalytic combustion treatment device containing a catalyst, which differs from Example 1 in that the heat exchange tube 4 has an S-shaped structure.
[0053] In this embodiment, the S-shaped heat exchange tube 4 has a large heat conduction area, which can further improve the heat exchange efficiency.
Claims
1. A gas catalytic combustion treatment device containing a catalyst, comprising a combustion chamber (1), characterized in that: A heat exchange tube (4) is installed on the top of the combustion chamber (1). The left and right ends of the heat exchange tube (4) are connected to a liquid outlet pipe (6) and a liquid inlet pipe (5), respectively. Multiple preheating catalytic boxes (8) are installed on the front side of the combustion chamber (1). A catalytic preheating plate (11) is installed inside the preheating catalytic box (8). Multiple vertically penetrating vents (12) are distributed on the catalytic preheating plate (11). A catalyst is placed inside the vents (12). The lower end of the gas inlet pipe (21) is connected to the gas inlet pipe (21). The gas inlet pipe (21) is connected to the gas inlet main pipe (20) at one end away from the preheating catalytic box (8). The upper end of the gas inlet (12) is connected to the gas supply pipe (15). The gas supply pipe (15) is connected to the combustion chamber (1) at one end away from the preheating catalytic box (8). The right end of the combustion chamber (1) is equipped with an air inlet (2), and the left end of the combustion chamber (1) is equipped with an exhaust port (3). The gas supply pipe (15) is connected to the preheating catalytic box (8) by a reverse blowing cleaning pipe (17). The reverse blowing cleaning pipe (17) has its port pointing vertically downwards and is equipped with a first solenoid valve (18).
2. The gas catalytic combustion treatment device containing a catalyst according to claim 1, characterized in that: The preheating catalytic box (8) is provided with a catalytic box opening (9) at one end facing the combustion chamber (1). Multiple combustion chamber openings (7) are provided on the front side wall of the combustion chamber (1). The combustion chamber openings (7) are connected to the catalytic box openings (9). A "U"-shaped preheating channel (10) is formed between the outer wall of the catalytic preheating plate (11) and the side wall of the preheating catalytic box (8).
3. The gas catalytic combustion treatment device containing a catalyst according to claim 1, characterized in that: The upper end of the vent (12) is connected to the gas supply pipe (15) through the vent cover (14), and the lower end of the vent (12) is connected to the gas inlet pipe (21) through the vent cover (14).
4. A gas catalytic combustion treatment device containing a catalyst according to claim 1, characterized in that: An attachment net (13) is fixedly installed in the pores (12), and the catalyst is fixed on the attachment net (13).
5. A gas catalytic combustion treatment device containing a catalyst according to claim 1, characterized in that: The catalytic preheating plate (11) is made of ceramic.
6. A gas catalytic combustion treatment device containing a catalyst according to claim 1, characterized in that: A second solenoid valve (16) is installed on the gas supply pipe (15).
7. A gas catalytic combustion treatment device containing a catalyst according to claim 6, characterized in that: The reverse blowing cleaning pipe (17) is connected to the cleaning blowing main pipe (19) at the end away from the preheating catalytic box (8).
8. A gas catalytic combustion treatment device containing a catalyst according to claim 1, characterized in that: The heat exchange tubes (4) are configured as multiple, and the ends of the multiple heat exchange tubes (4) are connected to the liquid outlet pipe (6) or the liquid inlet pipe (5).
9. A gas catalytic combustion treatment device containing a catalyst according to claim 1, characterized in that: The heat exchange tube (4) has an S-shaped structure.