A waste gas treatment device for a tower crane structural component painting line

Abstract

This utility model discloses a waste gas treatment device for a tower crane structural component painting line, specifically relating to the field of painting waste gas treatment technology. It includes a painting waste gas source, an adsorption unit, a desorption unit, and safety devices. The filtration unit includes a pressure transmitter, a fire damper, a temperature sensor, and a pressure-dry filter. The adsorption unit includes an activated carbon adsorption bed, an adsorption fan, and a chimney. The desorption unit includes an activated carbon adsorption bed, a desorption fan, a catalytic combustion device, and a cooling fan. The safety devices include a fire-fighting water supply and a nitrogen generator. This utility model, through a honeycomb activated carbon adsorption and catalytic combustion desorption regeneration process, combined with comprehensive safety devices, can efficiently purify waste gas, save energy and reduce consumption, and ensure operational safety. It has advantages such as strong adaptability and economic practicality, effectively solving the problem of tower crane painting waste gas treatment and achieving compliant emissions.

Description

Technical Field

[0001] This utility model relates to the field of coating exhaust gas treatment technology, and more specifically, to an exhaust gas treatment device for a tower crane structural component coating line. Background Technology

[0002] Volatile organic compounds (VOCs) generated during tower crane painting mainly include aromatic hydrocarbons, alcohols, esters, and ketones. These are important precursors to urban haze and photochemical smog, participating in the formation of ozone and secondary aerosols in the atmosphere, causing regional ozone pollution and PM2.5 pollution. Long-term exposure to VOC environments can seriously affect human health.

[0003] Currently, the main methods for treating exhaust gases from tower crane painting include adsorption, combustion, condensation, biological methods, and combinations of these methods. For tower crane manufacturing, environmental protection and ensuring employee health are of paramount importance. Therefore, by applying appropriate exhaust gas treatment technologies and equipment, ensuring that exhaust gases from tower crane painting meet emission standards, resource recycling can be achieved, production costs reduced, and economic benefits brought to the enterprise.

[0004] Therefore, a waste gas treatment device for tower crane structural component painting line is proposed. Utility Model Content

[0005] To overcome the aforementioned deficiencies of the prior art, this utility model provides a waste gas treatment device for a tower crane structural component painting line. It effectively treats the organic waste gas emitted from the tower crane painting production line using a honeycomb activated carbon adsorption + catalytic combustion desorption regeneration process. The device is equipped with safety devices to prevent overheating and other safety issues. It is easy to install, has low investment costs, and boasts advantages such as high treatment efficiency, energy saving, stability and reliability, no secondary pollution, strong adaptability, and economic practicality. This achieves compliant waste gas emissions, ensures safe production, and solves the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a waste gas treatment device for a tower crane structural component painting line, comprising:

[0007] Waste gas source, adsorption unit, desorption unit, safety devices, and multiple activated carbon adsorption beds that work alternately;

[0008] The exhaust gas source is connected to a fire damper and a dry filter in sequence through a pipeline. The dry filter is configured as a two-stage filtration structure consisting of a primary G4 filter bag and a medium-efficiency F5 filter bag.

[0009] The adsorption unit includes multiple parallel activated carbon adsorption beds. Each activated carbon adsorption bed is filled with honeycomb activated carbon and equipped with an airflow distributor. The outlet of the dry filter is connected to the inlet of the activated carbon adsorption bed through a first waste gas on / off valve. The outlet of the activated carbon adsorption bed is connected to the chimney through an adsorption fan.

[0010] The desorption unit includes a desorption fan, a catalytic combustion device, and a first supplementary cooling fan. The desorption outlet of the activated carbon adsorption bed is connected to the desorption fan through a first desorption valve. The outlet of the desorption fan is connected to the inlet of the catalytic combustion device. The catalytic combustion device is equipped with a heat exchanger, a preheater, and a catalyst layer. The desorption fan is connected to a direct discharge valve and a second desorption valve. The second desorption valve is connected to the activated carbon adsorption bed.

[0011] The safety device includes a first temperature sensor, a second temperature sensor, a third temperature sensor, a spray cooling module, and a nitrogen generator. The spray cooling module is connected to the activated carbon adsorption bed and the catalytic combustion device through a fire hydrant water supply and a water valve. The nitrogen generator is connected to the desorption unit through a nitrogen replenishment valve.

[0012] The multiple activated carbon adsorption beds are controlled by switching valve groups to alternate between adsorption and desorption states, with at least one adsorption bed in the adsorption state and the other in the desorption and regeneration state.

[0013] Preferably, the inlet of the catalytic combustion device is equipped with a flame arrestor and dust collector, and its shell is equipped with a pressure relief port and an over-temperature alarm device. The preheater is connected to an electric heater.

[0014] Preferably, the first supplementary cooling fan is connected to the inlet of the catalytic combustion device through an emergency supplementary cooling valve. When the first temperature sensor detects that the temperature of the desorbed gas exceeds 90°C, the first supplementary cooling fan is started and the emergency supplementary cooling valve is opened to cool down the gas.

[0015] Preferably, the spray cooling module is linked with the nitrogen generator. When the third temperature sensor detects that the desorption temperature of the activated carbon adsorption bed exceeds the set threshold, it automatically triggers the water valve to spray or the nitrogen generator to inject nitrogen to suppress combustion.

[0016] Preferably, the switching valve group of the plurality of activated carbon adsorption beds includes a first desorption valve, a second desorption valve, a third desorption valve, a first waste gas on / off valve, and a second waste gas on / off valve.

[0017] Preferably, the heat exchanger of the catalytic combustion device is connected to the second supplementary cooling fan, and a controlled cooling and supplementary cooling valve is provided between the second supplementary cooling fan and the catalytic combustion device.

[0018] Preferably, a pressure transmitter is installed on the pipeline connecting the exhaust gas source and the dry filter.

[0019] The technical effects and advantages of this utility model are as follows:

[0020] 1. The honeycomb activated carbon adsorption and catalytic combustion desorption and regeneration process can effectively treat the organic waste gas emitted from the tower crane painting production line. The two-stage filtration structure of the dry filter can remove paint mist and dust, reduce the activated carbon replacement cycle, and the multiple activated carbon adsorption beds work alternately to improve adsorption efficiency, making the waste gas purification more thorough and achieving emission standards.

[0021] 2. Heat can be recovered through the heat exchanger in the catalytic combustion device. When the concentration of exhaust gas is low, it can automatically and intermittently compensate for heating, reduce energy consumption, and lower production costs.

[0022] 3. Equipped with comprehensive safety devices, including multiple temperature sensors, a spray cooling module, and a nitrogen generator, when the desorbed gas temperature is too high, it can be cooled and extinguished by means of supplemental cooling fans, spray cooling, and nitrogen injection. The catalytic combustion device is also equipped with a flame arrestor dust collector, a pressure relief port, and an over-temperature alarm device to ensure safe operation of the equipment and prevent safety accidents such as fires. Moreover, it does not require dedicated personnel to monitor the operating temperature, thus reducing the overall operating cost of the device.

[0023] 4. The adsorption and desorption states can be flexibly controlled by switching valve groups through multiple activated carbon adsorption beds, which can adapt to the waste gas treatment needs under different working conditions and has good adaptability to the treatment of waste gas from tower crane painting. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0025] Figure 2 This is a schematic diagram of the principle structure of this utility model.

[0026] The attached diagram is labeled as follows: 1. First supplementary cooling fan; 2. Emergency supplementary cooling valve; 3. First temperature sensor; 4. Fire hydrant water supply; 5. Exhaust gas source; 6. Pressure transmitter; 7. Fire damper; 8. Second temperature sensor; 9. Dry filter; 10. First desorption valve; 11. First exhaust gas on / off valve; 12. Water valve; 13. Catalytic combustion device; 14. Desorption fan; 15. Second desorption valve; 16. Third temperature sensor; 17. Activated carbon adsorption bed; 18. Direct discharge valve; 19. Controlled cooling supplementary cooling valve; 20. Second supplementary cooling fan; 21. Nitrogen generator; 22. Third desorption valve; 23. Second exhaust gas on / off valve; 24. Nitrogen supplementary cooling valve; 25. Adsorption fan. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] As attached Figure 1 and Figure 2 The exhaust gas treatment device shown is for a tower crane structural component painting line, comprising:

[0029] 5. Waste gas source, adsorption unit, desorption unit, safety device and multiple activated carbon adsorption beds 17 working alternately;

[0030] The exhaust gas source 5 is connected in sequence to the fire damper 7 and the dry filter 9 through a pipeline. The dry filter 9 is configured as a two-stage filtration structure consisting of a primary G4 filter bag and a medium-efficiency F5 filter bag.

[0031] The adsorption unit includes multiple parallel activated carbon adsorption beds 17, each activated carbon adsorption bed 17 is filled with honeycomb activated carbon and equipped with an airflow distributor, the outlet of the dry filter 9 is connected to the inlet of the activated carbon adsorption bed 17 through a first waste gas on / off valve 11, and the outlet of the activated carbon adsorption bed 17 is connected to the chimney through an adsorption fan 25.

[0032] The desorption unit includes a desorption fan 14, a catalytic combustion device 13, and a first supplementary cooling fan 1. The desorption outlet of the activated carbon adsorption bed 17 is connected to the desorption fan 14 through a first desorption valve 10. The outlet of the desorption fan 14 is connected to the inlet of the catalytic combustion device 13. The catalytic combustion device 13 is equipped with a heat exchanger, a preheater, and a catalyst layer. The desorption fan 14 is connected to a direct discharge valve 18 and a second desorption valve 15. The second desorption valve 15 is connected to the activated carbon adsorption bed 17.

[0033] The safety device includes a first temperature sensor 3, a second temperature sensor 8, a third temperature sensor 16, a spray cooling module and a nitrogen generator 21. The spray cooling module is connected to the activated carbon adsorption bed 17 and the catalytic combustion device 13 through a fire hydrant water supply 4 and a water valve 12. The nitrogen generator 21 is connected to the desorption unit through a nitrogen replenishment valve 24.

[0034] The multiple activated carbon adsorption beds 17 are controlled by switching valve groups to alternate between adsorption and desorption states, with at least one adsorption bed in the adsorption state and the other in the desorption and regeneration state.

[0035] The catalytic combustion device 13 is equipped with a flame arrestor and dust collector at its inlet, and a pressure relief port and an over-temperature alarm device are provided on its shell. The preheater is connected to an electric heater.

[0036] The first supplementary cooling fan 1 is connected to the inlet of the catalytic combustion device 13 through the emergency supplementary cooling valve 2. When the first temperature sensor 3 detects that the temperature of the desorbed gas exceeds 90°C, the first supplementary cooling fan 1 is started and the emergency supplementary cooling valve 2 is opened to cool down the gas.

[0037] The spray cooling module is linked with the nitrogen generator 21. When the third temperature sensor 16 detects that the desorption temperature of the activated carbon adsorption bed 17 exceeds the set threshold, it automatically triggers the water valve 12 to spray or the nitrogen generator 21 to inject nitrogen to suppress combustion.

[0038] The switching valve group of the plurality of activated carbon adsorption beds 17 includes a first desorption valve 10, a second desorption valve 15, a third desorption valve 22, a first waste gas on / off valve 11, and a second waste gas on / off valve 23.

[0039] The heat exchanger of the catalytic combustion device 13 is connected to the second supplementary cooling fan 20, and a controlled cooling supplementary cooling valve 19 is provided between the second supplementary cooling fan 20 and the catalytic combustion device 13.

[0040] A pressure transmitter 6 is installed on the pipeline connecting the exhaust gas source 5 and the dry filter 9.

[0041] In practice, the coating exhaust gas, after primary adsorption by the dry filter 9, enters the activated carbon adsorption bed 17. Part of the gas adsorbed by the adsorption bed meets the standards and can be directly discharged. Then, the desorption fan 14 starts working, and the desorbed gas enters the catalytic combustion device 13. After catalytic combustion, the gas is divided into two parts: one part is directly discharged into the air; the other part enters the activated carbon adsorption bed 17 for desorption. This cycle continues until the gas meets the standards and is then discharged through the chimney.

[0042] Specifically, the paint exhaust gas adsorption process is as follows: Exhaust gas source 5 passes through fire damper 7 and then through dry filter 9 to adsorb paint mist and dust in the exhaust gas, preventing them from entering the purification system such as activated carbon adsorption bed 17. Dry filter 9 adopts two-stage filtration to reduce the activated carbon replacement cycle and reduce operating costs. There are six activated carbon adsorption beds 17, each with a processing air volume of 32,000 Nm³. 3 The unit is equipped with a high-performance activated carbon layer and various airflow distributors to concentrate and purify organic gases. The activated carbon is filled in a brick-built stack. After the gas enters the adsorption bed, the organic matter in the gas is adsorbed on the surface of the activated carbon, thereby purifying the gas. After the purified gas meets the standards, it is discharged into the atmosphere through the adsorption fan 25. The adsorption and desorption functions of the six activated carbon adsorption beds 17 are alternately activated, which can simultaneously adsorb and desorb the waste gas, greatly improving the treatment efficiency.

[0043] Desorption process of coating exhaust gas: When the activated carbon adsorption bed 17 is saturated, the desorption fan 14 starts to desorb the activated carbon adsorption bed 17. After the desorbed gas is detected by the first temperature sensor 3 and there is no overheating abnormality, it enters the catalytic combustion device 13. When the desorption temperature is too high, the cooling valve can be activated for supplemental cooling. The first cooling fan 1 is opened through the emergency cooling valve 2 to stabilize the temperature of the desorbed gas in the range of 70-90℃. The gas entering the catalytic combustion device 13 first passes through the heat exchanger in the catalytic bed, and then enters the preheater in the catalytic bed. Under the action of the electric heater, the gas temperature is raised to the range of 180-250℃. Then, it passes through the catalyst. The organic matter is burned under the action of the catalyst and decomposed into CO2 and H2O, releasing a large amount of heat at the same time, and the gas temperature is further increased. This high-temperature gas passes through the heat exchanger again to exchange heat with the incoming cold air. A portion of the heat is recovered, and the gas exiting the heat exchanger is divided into two parts: one part is directly discharged into the adsorption fan 25 pipeline through the direct discharge valve 18; the other part enters the activated carbon adsorption bed 17 for desorption again through the second desorption valve 15. The catalytic combustion device 13 is equipped with a flame arrestor dust collector, pressure relief port, over-temperature alarm and other protection facilities. When the waste gas concentration is low, automatic intermittent compensation heating is performed to effectively save energy. When the desorption temperature is too high, the second supplementary cooling fan 20 is started and the controlled cooling supplementary cooling valve 19 is opened to supplement cooling, so that the desorbed gas temperature is stabilized in the range of 70-90℃. When the third temperature sensor 16 detects that the desorption temperature of the activated carbon adsorption bed 17 is too high, the catalytic combustion device 13 is shut down. If the temperature still rises and there is smoke, the emergency plan should be activated. The water valve 12 of the fire hydrant water supply 4 is used for spraying and cooling, and the nitrogen generator 21 is used for cooling and fire extinguishing to ensure system safety.

[0044] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A waste gas treatment device for a tower crane structural component painting line, characterized in that, include: Waste gas source (5), adsorption unit, desorption unit, safety device and multiple activated carbon adsorption beds (17) working alternately. The exhaust gas source (5) is connected in sequence to a fire damper (7) and a dry filter (9) through a pipeline. The dry filter (9) is configured as a two-stage filtration structure consisting of a primary G4 filter bag and a medium-efficiency F5 filter bag. The adsorption unit includes multiple parallel activated carbon adsorption beds (17), each activated carbon adsorption bed (17) is filled with honeycomb activated carbon and equipped with an airflow distributor, the outlet of the dry filter (9) is connected to the inlet of the activated carbon adsorption bed (17) through the first waste gas shut-off valve (11), and the outlet of the activated carbon adsorption bed (17) is connected to the chimney through the adsorption fan (25). The desorption unit includes a desorption fan (14), a catalytic combustion device (13), and a first supplementary cooling fan (1). The desorption outlet of the activated carbon adsorption bed (17) is connected to the desorption fan (14) through a first desorption valve (10). The outlet of the desorption fan (14) is connected to the inlet of the catalytic combustion device (13). The catalytic combustion device (13) is equipped with a heat exchanger, a preheater, and a catalyst layer. The desorption fan (14) is connected to a direct discharge valve (18) and a second desorption valve (15). The second desorption valve (15) is connected to the activated carbon adsorption bed (17). The safety device includes a first temperature sensor (3), a second temperature sensor (8), a third temperature sensor (16), a spray cooling module and a nitrogen generator (21). The spray cooling module is connected to the activated carbon adsorption bed (17) and the catalytic combustion device (13) through a fire hydrant water supply (4) and a water valve (12). The nitrogen generator (21) is connected to the desorption unit through a nitrogen replenishment valve (24). Multiple activated carbon adsorption beds (17) are controlled by switching valve groups to alternate between adsorption and desorption states, with at least one adsorption bed in the adsorption state and the other in the desorption and regeneration state.

2. The exhaust gas treatment device for a tower crane structural component painting line according to claim 1, characterized in that, The catalytic combustion device (13) is equipped with a flame arrestor and dust collector at its inlet, and a pressure relief port and an over-temperature alarm device are provided on its shell. The preheater is connected to an electric heater.

3. The exhaust gas treatment device for a tower crane structural component painting line according to claim 1, characterized in that, The first supplementary cooling fan (1) is connected to the inlet of the catalytic combustion device (13) through the emergency supplementary cooling valve (2). When the first temperature sensor (3) detects that the temperature of the desorbed gas exceeds 90°C, the first supplementary cooling fan (1) is started and the emergency supplementary cooling valve (2) is opened to cool down the gas.

4. The exhaust gas treatment device for a tower crane structural component painting line according to claim 1, characterized in that, The spray cooling module is linked with the nitrogen generator (21). When the third temperature sensor (16) detects that the desorption temperature of the activated carbon adsorption bed (17) exceeds the set threshold, the water valve (12) is automatically triggered to spray or the nitrogen generator (21) injects nitrogen to suppress combustion.

5. The exhaust gas treatment device for a tower crane structural component painting line according to claim 1, characterized in that, The switching valve group of the multiple activated carbon adsorption beds (17) includes a first desorption valve (10), a second desorption valve (15), a third desorption valve (22), a first waste gas on / off valve (11), and a second waste gas on / off valve (23).

6. The exhaust gas treatment device for a tower crane structural component painting line according to claim 1, characterized in that, The heat exchanger of the catalytic combustion device (13) is connected to the second supplementary cooling fan (20), and a cooling control and supplementary cooling valve (19) is provided between the second supplementary cooling fan (20) and the catalytic combustion device (13).

7. The exhaust gas treatment device for a tower crane structural component painting line according to claim 1, characterized in that, A pressure transmitter (6) is installed on the pipeline connecting the exhaust gas source (5) and the dry filter (9).

Images