A device for removing CO from dry quenching tail gas

Abstract

This utility model discloses a device for removing CO from dry quenching coke tail gas, relating to the field of tail gas removal technology. It includes a device body with an air inlet fixedly located on one side. A flow regulating valve is fixedly located on the outer wall of the air inlet, and a partition is fixedly located on the inner wall of the device body. This utility model features an independent temperature control design within a multi-stage reaction chamber. Temperature control units are fixedly located between catalyst carriers and can provide real-time feedback from a temperature sensor on the top of the device body, enabling precise temperature control of each reaction zone. When tail gas flow rate or CO concentration fluctuates, the temperature control unit can quickly adjust the reaction temperature to ensure stable CO catalytic oxidation efficiency and avoid fluctuations in removal efficiency due to temperature deviations.

Description

Technical Field

[0001] This utility model relates to the field of exhaust gas removal technology, specifically to a device for removing CO from dry quenching coke exhaust gas. Background Technology

[0002] Dry quenching technology is a key process for energy conservation and emission reduction in the steel industry. If the CO contained in its exhaust gas is directly emitted, it will not only waste energy, but also exacerbate the greenhouse effect and air pollution.

[0003] Current CO removal devices for dry quenching coke tail gas suffer from the following unresolved technical challenges: The trace amounts of sticky coke powder derivatives carried in the dry quenching tail gas are difficult to remove completely by conventional filtration devices, easily adhering to the catalyst surface and clogging pores, leading to a catalyst deactivation cycle shortening by more than 30%, and cannot be cleaned by simple backflushing. The catalytic reaction relies on overall heating, and existing temperature control structures cannot achieve precise temperature control in specific zones, making it difficult to adapt to dynamic changes in tail gas flow and CO concentration. Furthermore, water vapor in the tail gas readily generates trace amounts of formic acid during the catalytic reaction with CO. Formic acid corrodes traditional ceramic catalyst supports, leading to decreased support strength and catalyst detachment, further shortening the device's lifespan. Utility Model Content

[0004] In view of the problems existing in the current exhaust gas removal, this utility model is proposed.

[0005] Therefore, the purpose of this invention is to provide a device for removing CO from dry quenching coke tail gas, which solves the problem that conventional filtration devices are difficult to completely remove CO and are prone to adhering to the catalyst surface and clogging the pores.

[0006] To achieve the above objectives, this utility model provides the following technical solution: A device for removing CO from dry quenching coke tail gas includes a device body. An air inlet is fixedly located on one side of the device body, and a flow regulating valve is fixedly located on the outer wall of the air inlet. A partition is fixedly located on the inner wall of the device body, and one side of the partition is divided into a first buffer chamber. A filter element is fixedly located within the first buffer chamber, and a hydrophobic polytetrafluoroethylene coating is fixedly located on the outer side of the filter element. A connecting pipe is fixedly located on one side of the partition, and a microwave resonant cavity is fixedly located on the outer wall of the connecting pipe. A microwave generator is fixedly located on the outer wall of the microwave resonant cavity. A temperature probe is fixedly located on the top of the device body. The other side of the partition is divided into multi-stage reaction chambers. An exhaust pipe is fixedly located on one side of the device body, and a heat recovery box is fixedly located on one side of the exhaust pipe. A temperature sensor is fixedly located on one side of the heat recovery box.

[0007] Preferably, multiple catalyst carriers are fixedly arranged inside the multi-stage reaction chamber, and a connecting pipe is fixedly arranged between the multiple catalyst carriers. A gas-liquid separator is fixedly arranged on the wall of the connecting pipe, and a protective net is fixedly arranged on both sides of the catalyst carrier.

[0008] Preferably, a control panel is fixedly provided on one side of the device body, and a display screen is fixedly provided on the top of the control panel.

[0009] Preferably, a temperature control unit is fixedly provided between the catalyst supports.

[0010] Furthermore, the inner wall of the microwave resonant cavity is provided with an alumina ceramic heat insulation layer.

[0011] Preferably, a drain pipe is fixedly provided at the bottom of the catalyst carrier, and a valve body and a liquid sensor are fixedly provided on the outer wall of the drain pipe.

[0012] The technical effects and advantages provided by this utility model in the above technical solution are as follows: 1. This utility model adopts an independent temperature control design in the multi-stage reaction chamber. The temperature control unit is fixed between the catalyst carriers. It can be combined with the temperature probe on the top of the device body for real-time feedback to accurately control the temperature of each reaction area. When the tail gas flow rate and CO concentration fluctuate, the temperature control unit can quickly adjust the reaction temperature to ensure the stability of CO catalytic oxidation efficiency and avoid the removal efficiency fluctuation caused by temperature deviation.

[0013] 2. In this invention, trace amounts of formic acid generated from the reaction of water vapor and CO in the exhaust gas can corrode traditional ceramic catalyst supports, leading to a decrease in support strength and catalyst detachment. This device addresses this problem through two structural features: first, a gas-liquid separator fixed to the wall of the connecting pipe intercepts and condenses formic acid vapor in the exhaust gas; second, a drain pipe at the bottom of the catalyst support, in conjunction with an external liquid sensor and valve. When the liquid sensor detects formic acid accumulation, the valve automatically opens to drain the accumulated liquid. This dual drainage design reduces the concentration of formic acid in contact with the catalyst support, thus lowering the corrosion rate of the support. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0015] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a three-dimensional structural diagram of the drainage pipe of this utility model; Figure 3 For the present utility model Figure 1 Enlarged schematic diagram of part A.

[0016] Explanation of reference numerals in the attached figures: 1. Device body; 2. Air inlet; 3. Flow regulating valve; 4. Baffle; 5. First buffer chamber; 6. Filter element; 7. PTFE hydrophobic coating; 8. Connecting pipe; 9. Microwave resonant cavity; 10. Microwave generator; 11. Temperature probe; 12. Multi-stage reaction chamber; 13. Exhaust pipe; 14. Heat recovery box; 15. Temperature sensor; 16. Catalyst carrier; 17. Connecting pipe; 18. Gas-liquid separator; 19. Protective net; 20. Control panel; 21. Display screen; 22. Temperature control unit; 23. Alumina ceramic insulation layer; 24. Drain pipe; 25. Valve body; 26. Liquid sensor. Detailed Implementation

[0017] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0018] This utility model discloses a device for removing CO from dry quenching coke tail gas.

[0019] This utility model provides, for example Figure 1-3The device for removing CO from dry quenching coke tail gas shown includes a device body 1. An air inlet 2 is fixedly installed on one side of the device body 1. A flow regulating valve 3 is fixedly installed on the outer wall of the air inlet 2. A partition 4 is fixedly installed on the inner wall of the device body 1. One side of the partition 4 is divided into a first buffer chamber 5. A filter element 6 is fixedly installed inside the first buffer chamber 5. A polytetrafluoroethylene hydrophobic coating 7 is fixedly installed on the outer side of the filter element 6. A connecting pipe 8 is fixedly installed on one side of the partition 4. A microwave resonant cavity 9 is fixedly installed on the outer wall of the connecting pipe 8. A microwave generator 10 is fixedly installed on the outer wall of the microwave resonant cavity 9. A temperature probe 11 is fixedly installed on the top of the device body 1. The other side of the partition 4 is divided into multi-stage reaction chambers 12. An exhaust pipe 13 is fixedly installed on one side of the device body 1. A [missing information - likely a device name or design] is fixedly installed on one side of the exhaust pipe 13. The heat recovery box 14 has a temperature sensor 15 fixedly installed on one side. The dry quenching tail gas first enters the device through the air inlet 2 on one side of the device body 1. The flow regulating valve 3 on the outer wall of the air inlet 2 can be set and adjusted according to the actual processing requirements via the control panel 20. When the CO concentration in the tail gas is high or the content of sticky coke powder derivatives exceeds the standard, the flow rate can be appropriately reduced to extend the subsequent processing time. When the tail gas composition is stable, the flow rate can be increased to ensure processing efficiency, achieving dynamic matching between the air intake and processing capacity. The tail gas entering the device first flows into the first buffer chamber 5 formed by the partition 4. The buffer chamber can reduce the tail gas flow velocity, avoid high-speed airflow directly impacting subsequent components and causing damage, and at the same time make the tail gas evenly distributed in the chamber. The filter element 6 fixed inside the first buffer chamber 5 is the core interception component. The polytetrafluoroethylene hydrophobic coating 7 coated on its outer side can prevent water vapor in the exhaust gas from condensing on the surface of the filter element 6, thus avoiding the blockage of the filter element pores by the aggregation of sticky coke powder derivatives due to water. On the other hand, it can enhance the adsorption and interception capacity of the filter element for activated coke powder, initially removing most of the particulate impurities in the exhaust gas. The exhaust gas pretreated by the first buffer chamber 5 flows to the multi-stage reaction chamber 12 through the connecting pipe 8 on one side of the partition 4. The microwave resonant cavity 9 fixed on the outer wall of the connecting pipe 8 works in conjunction with the microwave generator 10 on the outside. The microwave energy is transmitted to the inside of the connecting pipe 8 through the microwave resonant cavity 9 to activate the trace amounts of sticky coke powder derivatives in the exhaust gas inside the pipe. The microwave energy can destroy the sticky molecules of the coke powder derivatives. The structure simultaneously preheats the exhaust gas, creating suitable temperature conditions for subsequent catalytic reactions. The alumina ceramic heat insulation layer 23 on the inner wall of the microwave resonant cavity 9 reduces microwave leakage and heat loss, ensuring activation efficiency and operational safety. The activated exhaust gas enters the multi-stage reaction chamber 12 on the other side of the partition 4. Multiple catalyst carriers 16 fixed inside the chamber are the core units for CO removal. The catalyst carriers 16 are made of cordierite material with Pt-Rh alloy catalyst loaded on their surface. CO and oxygen in the exhaust gas undergo an oxidation reaction under the action of the catalyst to generate harmless CO2. The connecting pipes 17 between the catalyst carriers 16 ensure smooth flow of exhaust gas between the reaction chambers, improving CO removal efficiency. Temperature control units 22 are fixed between the catalyst carriers 16.Combined with the real-time feedback of the reaction temperature from the temperature sensor 11 on the top of the device body 1, the temperature of each reaction chamber can be precisely adjusted. When the CO concentration in the exhaust gas increases, the temperature control unit 22 can raise the temperature of the corresponding reaction chamber to ensure a complete catalytic reaction. When the concentration decreases, the temperature can be appropriately lowered to save energy, achieving precise temperature control in different areas. Water vapor and CO in the exhaust gas will generate trace amounts of formic acid during the catalytic reaction. If it remains, it will corrode the catalyst carrier 16. The gas-liquid separator 18 fixed to the wall of the connecting pipe 8 can intercept the formic acid vapor in the exhaust gas and condense it into liquid in the separator. At the same time, the liquid sensor 26 fixed to the outer wall of the drain pipe 24 at the bottom of the catalyst carrier 16 can monitor the contents of the drain pipe 24 in real time. When the amount of formic acid accumulated reaches a set threshold, the liquid sensor 26 sends a signal to the control panel 20, automatically opening the valve 25 outside the drain pipe 24 to discharge the formic acid condensate from the device, preventing it from contacting the catalyst carrier 16 and causing corrosion. The purified exhaust gas, after multi-stage catalytic oxidation treatment, is discharged through the exhaust pipe 13 on one side of the device body 1. During the discharge process, the waste heat carried by the exhaust gas is recovered by the heat recovery box 14 on one side of the exhaust pipe 13. The temperature sensor 15 on one side of the heat recovery box 14 can monitor the temperature of the recovered heat in real time, ensuring stable recovery of waste heat and realizing energy reuse. Finally, the purified exhaust gas, after removing CO, impurities, and waste heat, is discharged from the rear end of the heat recovery box 14, meeting environmental emission requirements.

[0020] For the convenience of catalysis, such as Figure 1 As shown, multiple catalyst carriers 16 are fixedly installed in the multi-stage reaction chamber 12, and a connecting pipe 17 is fixedly installed between the multiple catalyst carriers 16. A gas-liquid separator 18 is fixedly installed on the wall of the connecting pipe 8, and a protective net 19 is fixedly installed on both sides of the catalyst carrier 16.

[0021] For ease of operation, such as Figure 1 As shown, a control panel 20 is fixedly provided on one side of the device body 1, and a display screen 21 is fixedly provided on the top of the control panel 20.

[0022] To facilitate temperature control, such as Figure 1 As shown, a temperature control unit 22 is fixedly provided between the catalyst carriers 16.

[0023] Finally, for easy drainage, such as Figure 1-3 As shown, the inner wall of the microwave resonant cavity 9 is provided with an alumina ceramic heat insulation layer 23, the bottom of the catalyst carrier 16 is fixedly provided with a drain pipe 24, and the outer wall of the drain pipe 24 is fixedly provided with a valve body 25 and a liquid sensor 26.

[0024] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A device for removing CO from dry quenching coke tail gas, comprising a device body (1), characterized in that, An air inlet (2) is fixedly provided on one side of the device body (1). A flow regulating valve (3) is fixedly provided on the outer wall of the air inlet (2). A partition (4) is fixedly provided on the inner wall of the device body (1). One side of the partition (4) is divided into a first buffer chamber (5). A filter element (6) is fixedly provided in the first buffer chamber (5). A polytetrafluoroethylene hydrophobic coating (7) is fixedly provided on the outer side of the filter element (6). A connecting pipe (8) is fixedly provided on one side of the partition (4). A microwave resonant cavity (9) is fixedly provided on the outer wall of the connecting pipe (8). A microwave generator (10) is fixedly provided on the outer wall of the microwave resonant cavity (9). A temperature probe (11) is fixedly provided on the top of the device body (1). The other side of the partition (4) is divided into a multi-stage reaction chamber (12). An exhaust pipe (13) is fixedly provided on one side of the device body (1). A heat recovery box (14) is fixedly provided on one side of the exhaust pipe (13). A temperature sensor (15) is fixedly provided on one side of the heat recovery box (14).

2. The apparatus for removing CO from dry quenching coke tail gas according to claim 1, characterized in that, Multiple catalyst carriers (16) are fixedly arranged inside the multi-stage reaction chamber (12), and a connecting pipe (17) is fixedly arranged between the multiple catalyst carriers (16). A gas-liquid separator (18) is fixedly arranged on the wall of the connecting pipe (8), and a protective net (19) is fixedly arranged on both sides of the catalyst carrier (16).

3. The apparatus for removing CO from dry quenching coke tail gas according to claim 1, characterized in that, The device body (1) is fixedly provided with a control panel (20) on one side, and a display screen (21) is fixedly provided on the top of the control panel (20).

4. The apparatus for removing CO from dry quenching coke tail gas according to claim 2, characterized in that, Temperature control units (22) are fixedly provided between the catalyst supports (16).

5. The apparatus for removing CO from dry quenching coke tail gas according to claim 1, characterized in that, The inner wall of the microwave resonant cavity (9) is provided with an alumina ceramic heat insulation layer (23).

6. The apparatus for removing CO from dry quenching coke tail gas according to claim 2, characterized in that, The catalyst carrier (16) is fixedly provided with a drain pipe (24) at the bottom, and a valve body (25) and a liquid sensor (26) are fixedly provided on the outer wall of the drain pipe (24).

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