Activation furnace tail gas treatment system
By designing a staged cooling activation furnace tail gas treatment system, the heat of the tail gas is recovered by using a waste heat boiler and preheater, which solves the problems of equipment damage and water consumption in high-temperature tail gas treatment, and achieves the effects of energy saving, consumption reduction and environmental protection.
Patent Information
- Application Number
- CN202520501645.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-21
- Publication Date
- 2026-02-03
- Estimated Expiration
- 2035-03-21
AI Technical Summary
In existing technologies, the treatment of tail gas from activation furnaces has problems such as high-temperature tail gas directly entering the spray tower, causing damage to the equipment and excessive water consumption, and it fails to effectively recover the heat in the tail gas.
Design an activation furnace exhaust gas treatment system, including a primary waste heat treatment device and a secondary waste heat treatment device. The system treats high-temperature exhaust gas by cooling it in stages and purifies it by spraying with a spray tower. The system also recovers heat from the exhaust gas using a waste heat boiler and a preheater to generate steam for power generation or use in the activation furnace.
It effectively avoids damage to the purification device due to high temperature, reduces water consumption, saves operating costs, and realizes heat recovery and utilization, reducing energy waste, and has green environmental protection and energy-saving effects.
Smart Images
Figure CN223869832U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of exhaust gas treatment technology, and in particular to an activation furnace exhaust gas treatment system. Background Technology
[0002] Activation furnaces are key equipment in chemical production used for the pretreatment or regeneration of catalysts. Their core function is to optimize the activity, selectivity, and stability of catalysts by controlling temperature, atmosphere, and heat transfer conditions. With increasingly stringent environmental requirements in the chemical industry, the treatment of activation furnace exhaust gas has become a crucial aspect of technological upgrading. During catalyst pretreatment or regeneration, activation furnaces release complex pollutants due to high-temperature reactions, reduction / oxidation atmosphere control, and organic matter decomposition. Exhaust gas treatment technology must balance efficiency, economy, and environmental friendliness. In actual production, wet scrubbing technology, such as spray towers, is often used to treat exhaust gas. However, directly discharging high-temperature exhaust gas into the spray tower can cause problems such as high-temperature perforation and blade breakage inside the fan, while also requiring a large amount of cooling water for cooling. Utility Model Content
[0003] To address the aforementioned problems, the purpose of this invention is to design an activation furnace exhaust gas treatment system that can effectively treat the high-temperature exhaust gas discharged from the activation furnace.
[0004] The objective of this utility model is achieved through the following technical solution:
[0005] A system for treating exhaust gas from an activation furnace is designed, comprising an activation furnace, a purification device, and a primary waste heat treatment device and a secondary waste heat treatment device disposed between the activation furnace and the purification device. The activation furnace includes a high-temperature exhaust gas outlet, which is connected to both the primary and secondary waste heat treatment devices. The primary waste heat treatment device is connected to the secondary waste heat treatment device, and the secondary waste heat treatment device is connected to the purification device. In a first operating state, the high-temperature exhaust gas emitted from the activation furnace is cooled sequentially by the primary and secondary waste heat treatment devices before entering the purification device. In a second operating state, the high-temperature exhaust gas emitted from the activation furnace is cooled by the secondary waste heat treatment device before entering the purification device.
[0006] In this scheme, the activation furnace generates high-temperature exhaust gas at different temperatures during each heating stage. This high-temperature exhaust gas is cooled by a primary waste heat treatment device and a secondary waste heat treatment device before being discharged into a purification device for decomposition and purification. Finally, the purified exhaust gas is discharged. Specifically, in the first operating state, the temperature of the high-temperature exhaust gas discharged from the activation furnace exceeds 220°C. At this point, the high-temperature exhaust gas undergoes staged cooling through the primary and secondary waste heat treatment devices, eventually reducing the exhaust gas temperature to a preset temperature (e.g., 90°C), before being discharged into the purification device for decomposition and purification. In the second operating state, the temperature of the high-temperature exhaust gas discharged from the activation furnace does not exceed 220°C. In this case, the secondary waste heat treatment device alone can reduce the exhaust gas temperature to the preset temperature (e.g., 90°C). Therefore, the high-temperature exhaust gas discharged from the activation furnace is directly discharged into the secondary waste heat treatment device for cooling before being discharged into the purification device for decomposition and purification. By effectively cooling the high-temperature exhaust gas under different operating conditions, the exhaust gas entering the purification device is reduced to a preset temperature, effectively preventing potential internal damage to the purification device caused by the high-temperature exhaust gas. This also reduces the water consumption for cooling the purification device, saving operating costs. Furthermore, by effectively recovering and utilizing the heat from the high-temperature exhaust gas, heat loss is reduced, energy waste is avoided, and the device exhibits green, environmentally friendly, energy-saving, and consumption-reducing effects.
[0007] Furthermore, the primary waste heat treatment device is a waste heat boiler, which includes a first tail gas inlet, a first tail gas outlet, and a first steam outlet. The first tail gas inlet is connected to the high-temperature tail gas outlet, and the first steam outlet is connected to the steam-using device.
[0008] In this scheme, the primary waste heat treatment unit uses a waste heat boiler to convert the heat in the high-temperature exhaust gas into steam, thereby reducing the exhaust gas temperature. Simultaneously, the first steam outlet of the waste heat boiler is connected to an external gas-using device, such as a steam turbine for power generation. When the activation furnace requires steam to operate, the first steam outlet can also be connected to the steam inlet of the activation furnace to input the generated steam into the furnace. By utilizing the waste heat boiler to generate steam from the waste heat of the high-temperature exhaust gas, energy utilization efficiency is improved, and energy consumption and carbon emissions are reduced.
[0009] Furthermore, the secondary waste heat treatment device includes a preheater for heating water. The preheater includes a second exhaust gas inlet, a third exhaust gas inlet, and a second exhaust gas outlet. The second exhaust gas inlet is connected to the high-temperature exhaust gas outlet, the first exhaust gas outlet is connected to the third exhaust gas inlet, and the second exhaust gas outlet is connected to the purification device.
[0010] In this scheme, the secondary waste heat treatment device adopts a preheater, which is connected to an external water supply device. The heat in the high-temperature exhaust gas is used to heat the cold water to a certain temperature, so as to cool the high-temperature exhaust gas down to the preset temperature. The cooled exhaust gas is discharged into the purification device from the second exhaust gas outlet.
[0011] Furthermore, the preheater also includes a first water outlet, and the primary waste heat treatment device also includes a first water inlet, with the first water outlet and the first water inlet connected together.
[0012] In the first working state, the preheater uses high-temperature exhaust gas to heat water. The heated hot water is sent to the primary waste heat treatment device, namely the waste heat boiler, through the first outlet. The waste heat boiler directly heats the hot water to produce steam, thereby improving the steam production efficiency of the waste heat boiler.
[0013] Furthermore, the secondary waste heat treatment device also includes a steam generator, which includes a second water inlet and a second steam outlet. The preheater also includes a second water outlet, which is connected to the second water inlet, and the second steam outlet is connected to the steam-using device.
[0014] The secondary waste heat treatment unit is also equipped with a steam generator. In the first operating state, the preheater uses high-temperature exhaust gas to heat water. Since the primary waste heat treatment unit, i.e., the waste heat boiler, cannot completely consume the hot water, a portion of the heated hot water is sent to the steam generator through the second outlet. The steam generator then heats the hot water to produce steam. In the second operating state, the high-temperature exhaust gas directly enters the preheater, which uses the high-temperature exhaust gas to heat water. The heated hot water is then sent entirely to the steam generator through the second outlet. The steam generator then heats the hot water to produce steam. The second steam outlet of the steam generator is connected to an external gas-using device, such as a steam turbine for power generation. When the activation furnace requires steam to operate, the second steam outlet can also be connected to the steam inlet of the activation furnace to input the generated steam into the activation furnace.
[0015] Furthermore, the steam generator is an electric steam generator.
[0016] The steam generator is an electric steam generator, which has high steam production efficiency and can achieve precise control, which helps to ensure the stability of steam production.
[0017] Furthermore, the purification device is a spray tower, and the purification device is provided with a packing layer and a spray layer at intervals. The purification device is also provided with a spray water storage unit, and the spray water in the spray water storage unit is transported to the spray layer through a conveying pipeline.
[0018] The cooled exhaust gas enters the spray tower from the bottom. A spray layer is set at the top of the spray tower, and a packing layer with PP plastic Pall rings is set at intervals below the spray layer. The prepared spray water is transported to the spray layer by a water pump. The sprayer atomizes the spray water and sprays it from top to bottom, forming a counter-current flow to maximize the gas-liquid contact area and improve the efficiency of exhaust gas purification.
[0019] Furthermore, the bottom of the purification device is also equipped with a spray wastewater storage unit, and the spray wastewater in the spray wastewater storage unit is transported to an external wastewater collection tank through a conveying pipeline.
[0020] After being collected at the bottom of the purification device, the wastewater from the spraying process is pumped to an external wastewater collection tank for purification treatment, and then recycled or discharged.
[0021] Compared with the prior art, the beneficial effects of this utility model are:
[0022] In this scheme, the activation furnace generates high-temperature exhaust gas at different temperatures during each heating stage. This high-temperature exhaust gas is cooled by a primary waste heat treatment device and a secondary waste heat treatment device before being discharged into a purification device for decomposition and purification. Finally, the purified exhaust gas is discharged. Specifically, in the first operating state, the temperature of the high-temperature exhaust gas discharged from the activation furnace exceeds 220°C. At this point, the high-temperature exhaust gas undergoes staged cooling through the primary and secondary waste heat treatment devices, eventually reducing the exhaust gas temperature to a preset temperature (e.g., 90°C), before being discharged into the purification device for decomposition and purification. In the second operating state, the temperature of the high-temperature exhaust gas discharged from the activation furnace does not exceed 220°C. In this case, the secondary waste heat treatment device alone can reduce the exhaust gas temperature to the preset temperature (e.g., 90°C). Therefore, the high-temperature exhaust gas discharged from the activation furnace is directly discharged into the secondary waste heat treatment device for cooling before being discharged into the purification device for decomposition and purification. By effectively cooling the high-temperature exhaust gas under different operating conditions, the exhaust gas entering the purification device is reduced to a preset temperature, effectively preventing potential internal damage to the purification device caused by the high-temperature exhaust gas. This also reduces the water consumption for cooling the purification device, saving operating costs. Furthermore, by effectively recovering and utilizing the heat from the high-temperature exhaust gas, heat loss is reduced, energy waste is avoided, and the device exhibits green, environmentally friendly, energy-saving, and consumption-reducing effects. Attached Figure Description
[0023] Figure 1 This is a schematic diagram of the structure of an activation furnace tail gas treatment system according to an embodiment of the present invention.
[0024] Diagram Description: 1. Activation furnace; 11. High-temperature exhaust gas outlet; 2. Primary waste heat treatment device; 21. First exhaust gas inlet; 22. First exhaust gas outlet; 23. First water inlet; 24. First steam outlet; 3. Secondary waste heat treatment device; 31. Preheater; 32. Steam generator; 311. First water outlet; 312. Second water outlet; 313. Second exhaust gas inlet; 314. Third exhaust gas inlet; 315. Second exhaust gas outlet; 321. Second water inlet; 322. Second steam outlet; 4. Purification device; 41. Packing layer; 42. Spray layer; 43. Spray water storage unit; 44. Spray wastewater storage unit. Detailed Implementation
[0025] To facilitate understanding of this invention, a more comprehensive description will be provided below with reference to the accompanying drawings. The drawings illustrate preferred embodiments of the invention. However, this invention can be implemented in many different forms and is not limited to the embodiments described herein.
[0026] like Figure 1 As shown, this embodiment provides an activation furnace exhaust gas treatment system, including an activation furnace 1, a purification device 4, and a primary waste heat treatment device 2 and a secondary waste heat treatment device 3 disposed between the activation furnace 1 and the purification device 4. The activation furnace 1 includes a high-temperature exhaust gas outlet 11, which is connected to the primary waste heat treatment device 2 and the secondary waste heat treatment device 3 respectively. The primary waste heat treatment device 2 is connected to the secondary waste heat treatment device 3, and the secondary waste heat treatment device 3 is connected to the purification device 4. In the first working state, the high-temperature exhaust gas emitted from the activation furnace 1 is cooled down by the primary waste heat treatment device 2 and the secondary waste heat treatment device 3 in sequence before entering the purification device 4. In the second working state, the high-temperature exhaust gas emitted from the activation furnace 1 is cooled down by the secondary waste heat treatment device 3 before entering the purification device 4.
[0027] The activation furnace 1 generates high-temperature exhaust gas at different temperatures during each heating stage. This high-temperature exhaust gas is cooled by a primary waste heat treatment device 2 and a secondary waste heat treatment device 3 before being discharged into a purification device 4 for decomposition and purification. Finally, the purified exhaust gas is discharged. Specifically, in the first operating state, the temperature of the high-temperature exhaust gas discharged from the activation furnace 1 exceeds 220°C. At this point, the high-temperature exhaust gas undergoes gradual cooling through the primary waste heat treatment device 2 and the secondary waste heat treatment device 3, ultimately reducing the exhaust gas temperature to a preset temperature (e.g., 90°C), before being discharged into the purification device 4 for decomposition and purification. In the second operating state, the temperature of the high-temperature exhaust gas discharged from the activation furnace does not exceed 220°C. In this case, the secondary waste heat treatment device 3 alone can reduce the exhaust gas temperature to the preset temperature (e.g., 90°C). Therefore, the high-temperature exhaust gas discharged from the activation furnace 1 is directly discharged into the secondary waste heat treatment device 3 for cooling before being discharged into the purification device 4 for decomposition and purification. By effectively cooling the high-temperature exhaust gas under different operating conditions, the exhaust gas entering the purification device 4 is reduced to a preset temperature, effectively preventing potential internal damage to the purification device 4 caused by the high-temperature exhaust gas. This also reduces the water consumption for cooling the purification device 4, saving on operating costs. Furthermore, by effectively recovering and utilizing the heat from the high-temperature exhaust gas, heat loss is reduced, energy waste is avoided, and the device exhibits green, environmentally friendly, energy-saving, and consumption-reducing effects.
[0028] Specifically, the purification device 4 uses a spray tower, the primary waste heat treatment device 2 uses a waste heat boiler, and the secondary waste heat treatment device 3 includes a preheater for heating water and a steam generator, which can be an electric steam generator. The waste heat boiler includes a first tail gas inlet 21, a first tail gas outlet 22, a first water inlet 23, and a first steam outlet 24. The first tail gas inlet 21 is connected to the high-temperature tail gas outlet 11 via a pipeline, and the first steam outlet 24 is connected to the steam-using device via a pipeline. The preheater 31 includes a first water outlet 311, a second water outlet 312, a second tail gas inlet 313, a third tail gas inlet 314, and a second tail gas outlet 315. The second tail gas inlet 313 is connected to the high-temperature tail gas outlet 11 via a pipeline, the first tail gas outlet 22 is connected to the third tail gas inlet 314 via a pipeline, the first water outlet 311 and the first water inlet 23 are connected via a pipeline, and the second tail gas outlet 315 is connected to the spray tower via a pipeline. The steam generator includes a second water inlet 321 and a second steam outlet 322. The second water outlet 312 is connected to the second water inlet 321 through a pipeline, and the second steam outlet 322 is connected to the steam-using device through a pipeline.
[0029] In the first operating state, the temperature of the high-temperature exhaust gas discharged from the activation furnace 1 exceeds 220℃. At this point, the high-temperature exhaust gas first enters the waste heat boiler, which converts the heat in the exhaust gas into steam, thereby reducing the exhaust gas temperature. After initial cooling, the high-temperature exhaust gas enters the preheater, which is connected to an external water supply device. The heat from the high-temperature exhaust gas is used to heat cold water to a certain temperature to cool the exhaust gas down to a preset temperature (e.g., 90℃). The cooled exhaust gas is then discharged into the spray tower from the second exhaust gas outlet. During this process, the first steam outlet 24 of the waste heat boiler is connected to an external gas-using device, such as a steam turbine for power generation. When the activation furnace 1 needs steam to operate, the first steam outlet 24 can also be connected to the steam inlet of the activation furnace 1 to input the generated steam into the activation furnace. By utilizing the waste heat of the high-temperature exhaust gas to generate steam through the waste heat boiler, energy utilization efficiency is improved, and energy consumption and carbon emissions are reduced. The preheater uses high-temperature exhaust gas to heat water. The heated water is then sent to the waste heat boiler through the first outlet 311. The waste heat boiler directly heats the water to produce steam, thus improving the steam production efficiency of the waste heat boiler. Since the waste heat boiler cannot completely consume the hot water, a portion of the heated water is sent to the steam generator through the second outlet 312. The steam generator then heats the water to produce steam. The second steam outlet 322 of the steam generator can also be connected to an external gas-using device, such as a steam turbine for power generation. When the activation furnace requires steam to operate, the second steam outlet 322 can also be connected to the steam inlet of the activation furnace 1 to input the generated steam into the activation furnace 1.
[0030] In the second operating state, the temperature of the high-temperature exhaust gas discharged from the activation furnace 1 does not exceed 220℃. At this time, the high-temperature exhaust gas directly enters the preheater. The preheater is connected to an external water supply device, which uses the heat in the high-temperature exhaust gas to heat the cold water to a certain temperature, thereby cooling the high-temperature exhaust gas to a preset temperature (e.g., 90℃). The cooled exhaust gas is then discharged into the spray tower from the second exhaust gas outlet 315. During this process, the preheater uses the high-temperature exhaust gas to heat the water. The heated hot water is then sent to the steam generator through the second outlet 312, where it is heated to produce steam.
[0031] The cooled exhaust gas enters the spray tower from the bottom. A spray layer 42 is installed at the top of the spray tower, and a packing layer 41 filled with PP plastic Pall rings is installed below the spray layer 42 at intervals. The spray tower also has a spray water storage unit 43. The prepared spray water is pumped to the spray layer 42, and the sprayers atomize the spray water and spray it from top to bottom, forming a counter-current flow to maximize the gas-liquid contact area and improve the purification efficiency of the exhaust gas. A spray wastewater storage unit 44 is also installed at the bottom of the spray tower. The spray wastewater is collected at the bottom of the spray tower and pumped to an external wastewater collection tank for purification treatment, and then recycled or discharged.
[0032] In this embodiment, the activation furnace 1, waste heat boiler, preheater, steam generator and spray tower all adopt existing technologies. Although the specific structure and installation position of the activation furnace 1, waste heat boiler, preheater, steam generator and spray tower are not described in detail, those skilled in the art can fully understand and implement the above technical solutions through the description in this article, and there are no obstacles to understanding and implementation.
[0033] In the description of this utility model, it should be understood that terms such as "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" 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.
[0034] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, the inclusion of "first," "second," etc., in a feature may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.
[0035] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. An activated furnace tail gas treatment system, characterized by, The system comprises an activation furnace, a purification device, a first waste heat treatment device and a second waste heat treatment device arranged between the activation furnace and the purification device, the activation furnace comprises a high-temperature tail gas outlet, the high-temperature tail gas outlet is connected with the first waste heat treatment device and the second waste heat treatment device respectively, the first waste heat treatment device is connected with the second waste heat treatment device, and the second waste heat treatment device is connected with the purification device, in a first working state, the high-temperature tail gas discharged by the activation furnace enters the purification device after being cooled by the first waste heat treatment device and the second waste heat treatment device in turn, and in a second working state, the high-temperature tail gas discharged by the activation furnace enters the purification device after being cooled by the second waste heat treatment device.
2. The activation furnace off-gas treatment system of claim 1, wherein, The first waste heat treatment device is a waste heat boiler, the first waste heat treatment device comprises a first tail gas inlet, a first tail gas outlet and a first steam outlet, the first tail gas inlet is connected with the high-temperature tail gas outlet, and the first steam outlet is connected with a steam user.
3. The activation furnace off-gas treatment system of claim 2, wherein, The second waste heat treatment device comprises a preheater for heating water, the preheater comprises a second tail gas inlet, a third tail gas inlet and a second tail gas outlet, the second tail gas inlet is connected with the high-temperature tail gas outlet, the first tail gas outlet is connected with the third tail gas inlet, and the second tail gas outlet is connected with the purification device.
4. The activation furnace off-gas treatment system of claim 3, wherein, The preheater further comprises a first water outlet, and the first waste heat treatment device further comprises a first water inlet, the first water outlet and the first water inlet are connected.
5. The activation furnace off-gas treatment system of claim 3, wherein, The second waste heat treatment device further comprises a steam generator, the steam generator comprises a second water inlet and a second steam outlet, the preheater further comprises a second water outlet, the second water outlet is connected with the second water inlet, and the second steam outlet is connected with a steam user.
6. The activation furnace off-gas treatment system of claim 5, wherein, The steam generator is an electric steam generator.
7. The activation furnace off-gas treatment system of claim 1, wherein The purification device is a spray tower, a filler layer and a spray layer are arranged in the purification device at intervals, the purification device further comprises a spray water storage unit, and spray water in the spray water storage unit is delivered to the spray layer through a delivery pipeline.
8. The activation furnace off-gas treatment system of claim 7, wherein, The bottom of the purification device further comprises a spray sewage storage unit, and spray sewage in the spray sewage storage unit is delivered to an external sewage collection tank through a delivery pipeline.