Resin adsorption VOCs waste gas treatment system with steam desorption and post-cooling system

Abstract

The utility model belongs to waste gas recovery management equipment technical field discloses a kind of resin adsorption VOCs waste gas management system with steam analysis post-cooling system.The system includes VOCs adsorption resin tower, vacuum extraction and VOCs recovery component and combined cooling component, combined cooling component can carry out cooling operation to the analysis gas generated by VOCs adsorption resin tower thermal analysis and recycle condensed organic solvent, analysis gas can be backflow to VOCs adsorption resin tower, vacuum extraction and VOCs recovery component can carry out collection to part of analysis gas after cooling, and backflow delivery to VOCs adsorption resin tower, carry out circulation and re-analysis again.By resin adsorption VOCs waste gas management system with steam analysis post-cooling system, the problem of low efficiency, VOCs dissipation and high energy consumption of existing cooling mode is solved.

Description

Technical Field

[0001] This utility model belongs to the technical field of waste gas recovery and treatment equipment, and in particular, it is a resin adsorption VOCs waste gas treatment system with a steam desorption and cooling system. Background Technology

[0002] Among existing technologies for treating high-concentration VOCs, novel macroporous resin adsorption is widely used due to its advantages such as high adsorption efficiency and resin regeneration. Currently, resin adsorption processes mostly employ steam desorption, which requires cooling the resin after desorption. However, existing cooling methods have significant drawbacks: natural cooling takes as long as 8-12 hours, and residual VOCs are slowly released as the temperature decreases, polluting the environment. Traditional solutions sometimes use water spray cooling. While water spray cooling speeds up the process, the heat exchange efficiency between the cooling water and the tower wall is low, and it also generates a large amount of VOC-containing condensate wastewater. This wastewater requires additional treatment, resulting in significant costs and posing risks of secondary pollution and high regeneration energy consumption. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a resin adsorption VOCs waste gas treatment system with a steam desorption and cooling system.

[0004] The technical solution adopted by this utility model to solve its technical problem is: A resin adsorption VOCs waste gas treatment system with a steam desorption and subsequent cooling system is disclosed. The system includes a VOCs adsorption resin tower, a vacuum and VOCs recovery component, and a combined cooling component. The VOCs adsorption resin tower contains VOCs adsorption resin. The bottom of the VOCs adsorption resin tower has a steam desorption outlet, a vacuum interface, and a waste gas inlet. The top of the VOCs adsorption resin tower has a waste gas outlet and a steam inlet. The waste gas inlet of the VOCs adsorption resin tower is connected to external organic waste gas via a pipeline. The steam inlet of the VOCs adsorption resin tower is connected to external hot steam. The waste gas outlet of the VOCs adsorption resin tower discharges filtered organic waste gas, while steam enters the VOCs adsorption resin tower through the steam inlet. The combined cooling component includes an inlet and an outlet. The outlet of the combined cooling component includes a first outlet and a second outlet. The inlet of the combined cooling component is connected to the steam desorption outlet and the vacuum interface of the VOCs adsorption resin tower, and the first outlet of the combined cooling component is also connected to the waste gas inlet of the VOCs adsorption resin tower. The second outlet of the combined cooling component is connected to the inlet of the vacuum and VOCs recovery component, and the outlet of the vacuum and VOCs recovery component is connected to the vacuum port of the VOCs adsorption resin tower. The combined cooling component can cool the desorption gas generated by the thermal desorption of the VOCs adsorption resin tower and recover the condensed organic solvent, thereby improving the processing efficiency. The desorption gas can be returned to the VOCs adsorption resin tower. The vacuum and VOCs recovery component can collect a portion of the cooled desorption gas and return it to the VOCs adsorption resin tower for recycling and re-desorption.

[0005] Furthermore, the combined cooling assembly includes a condenser recovery unit, a circulating water cooler, a cryogenic water cooler, and a gas-liquid separator. The circulating water cooler, cryogenic water cooler, and gas-liquid separator are connected in sequence. The inlet of the circulating water cooler is connected to the vapor desorption outlet and vacuum port of the VOCs adsorption resin tower. The gas-liquid separator includes an inlet and an outlet, and the outlet of the gas-liquid separator includes a gas outlet and a liquid outlet. The outlet of the cryogenic water cooler is connected to the inlet of the gas-liquid separator. The circulating water cooler and the cryogenic water cooler can perform dual cooling and temperature reduction operations on the thermally desorbed gas. The liquid outlet of the gas-liquid separator is connected to the condenser and recovery unit. The gas outlet of the gas-liquid separator is connected to the exhaust gas inlet of the VOCs adsorption resin tower through a pipe via a shut-off valve and a vacuum regulating valve. The gas outlet of the gas-liquid separator can directly deliver the cooled desorbed gas to the VOCs adsorption resin tower, or it can deliver the cooled desorbed gas to a vacuum buffer tank for storage. The vacuuming and VOCs recovery assembly includes a vacuum pump and a vacuum buffer tank. The inlet of the vacuum buffer tank is connected to the gas-liquid separator and the shut-off valve via a vacuum regulating valve, a pressure sensor, and a check valve. The check valve prevents backflow of gas in the vacuum buffer tank, and the pressure sensor monitors the vacuum level in the pipeline. The vacuum buffer tank stores the desorbed gas from the VOCs adsorption resin tower. The outlet of the vacuum buffer tank is connected to the exhaust gas inlet of the VOCs adsorption resin tower via the vacuum pump. The vacuum pump transports the desorbed gas from the vacuum buffer tank back to the VOCs adsorption resin tower for recirculation and re-desorption.

[0006] Furthermore, the VOCs adsorption resin tower has a resin inspection port on its tower wall, and the VOCs adsorption resin tower is filled with a macroporous high-efficiency resin adsorbent. A multi-point temperature sensor is embedded in the side of the tower wall; or, the flange connections of the VOCs adsorption resin tower body are all equipped with corrosion-resistant high-temperature sealing gaskets; or, the top of the VOCs adsorption resin tower is equipped with a pressure sensor that can monitor the pressure of the resin tower.

[0007] Furthermore, the circulating water cooler and the low-temperature water cooler are double-pass shell-and-tube heat exchangers, with mixed steam flowing through the tubes and cooling water flowing through the shell.

[0008] Furthermore, the inner wall of the condenser tube is provided with a guide plate.

[0009] Furthermore, the vacuum pump outlet is equipped with a temperature sensor and a pressure sensor to monitor the operation of the vacuum pump, and the top of the vacuum buffer tank is equipped with an explosion-proof safety valve that automatically opens to release pressure when the pressure inside the tank exceeds -0.02MPa (gauge pressure).

[0010] Furthermore, the system also includes a PLC controller. The temperature sensor is a multi-point temperature sensor, which facilitates temperature data collection and control. The temperature sensor, pressure sensor, liquid level sensor, vacuum pump, vacuum regulating valve, flow control valve, and condenser are all connected to the PLC controller. The PLC controller can automatically adjust the vacuum pump power, speed, and vacuum regulating valve opening based on the signals fed back from each sensor.

[0011] Furthermore, temperature sensors and pressure sensors are connected and installed between the VOCs adsorption resin tower, the vacuuming and VOCs recovery component, and the combined cooling component in the system.

[0012] The advantages and positive effects of this utility model are as follows: 1. This utility model adopts a vacuum process and uses a resin adsorption VOCs waste gas treatment system with a vapor desorption and cooling system to solve the problems of low efficiency, VOCs emission and high energy consumption of existing cooling methods. It is especially suitable for the purification and resource recovery of high-concentration VOCs waste gas in industries such as chemical, pharmaceutical and pesticide industries.

[0013] 2. This utility model reduces the amount of wastewater generated by spray cooling by more than 90%, further reducing secondary pollution of wastewater. Compared with natural cooling, the time is shortened by more than 50%, and cooling can be completed in 2-3 hours, which indirectly reduces the design scale and construction cost of the adsorption resin tower. Attached Figure Description

[0014] Figure 1 This is a front view schematic diagram of a structural connection according to the present invention. Detailed Implementation

[0015] The present invention will be further described below with reference to the embodiments. The following embodiments are descriptive and not limiting, and should not be used to limit the protection scope of the present invention.

[0016] The various experimental operations involved in the specific embodiments are all conventional techniques in the field. For parts not specifically annotated in this document, those skilled in the art can refer to various commonly used reference books, scientific and technological documents or related instructions and manuals prior to the application date of this utility model to carry out the operations.

[0017] A resin adsorption VOCs waste gas treatment system with a steam desorption and subsequent cooling system, such as Figure 1 As shown, the system includes a VOCs adsorption resin tower 3, a vacuuming and VOCs recovery component, and a combined cooling component. The VOCs adsorption resin tower contains VOCs adsorption resin. The bottom of the VOCs adsorption resin tower has a steam desorption outlet, a vacuum interface 14, and a waste gas inlet 13. The top of the VOCs adsorption resin tower has a waste gas outlet 15 and a steam inlet 16. The waste gas inlet of the VOCs adsorption resin tower is connected to external organic waste gas via a pipeline, and the steam inlet of the VOCs adsorption resin tower is connected to external hot steam. The waste gas outlet of the VOCs adsorption resin tower can discharge filtered organic waste gas, and steam can enter the VOCs adsorption resin tower through the steam inlet. The combined cooling component includes an inlet and an outlet (neither labeled in the figure). The inlet of the combined cooling component is connected to the steam desorption outlet and vacuum interface of the VOCs adsorption resin tower, and the outlet of the combined cooling component is also connected to the waste gas inlet of the VOCs adsorption resin tower. The outlet of the combined cooling component is also connected to the inlet of the vacuum and VOCs recovery component, which in turn is connected to the exhaust gas inlet of the VOCs adsorption resin tower. The combined cooling component can cool the desorption gas generated by the thermal desorption of the VOCs adsorption resin tower and recover the condensed organic solvents, thereby improving the treatment efficiency. The desorption gas can be returned to the VOCs adsorption resin tower. The vacuum and VOCs recovery component can collect a portion of the cooled desorption gas and return it to the VOCs adsorption resin tower for re-desorption and circulation, ensuring the stability of the overall pressure of the desorption gas in the system and improving the treatment efficiency. The cyclic treatment also improves the treatment accuracy.

[0018] In use, the waste gas enters the VOCs adsorption resin tower through the waste gas inlet for adsorption. After adsorption is completed, the waste gas is discharged from the qualified gas outlet. Then, the waste gas inlet is closed, and steam is introduced into the VOCs adsorption resin tower. The steam undergoes thermal desorption in the VOCs adsorption resin tower, and the desorbed gas is discharged from the VOCs adsorption resin tower through the steam desorption outlet. The desorbed gas flows into the combined cooling component for cooling and the organic solvent is precipitated out. Then, the desorbed gas is vacuumed and the organic solvent is recovered by the VOCs recovery component, and the desorbed gas is returned to the VOCs adsorption resin tower for recycling.

[0019] This invention solves the problems of low efficiency, VOCs emission, and high energy consumption in existing cooling methods, and is applicable to the purification and resource recovery of high-concentration VOCs waste gas in industries such as chemical, pharmaceutical, and pesticide manufacturing.

[0020] In this embodiment, the combined cooling assembly includes a condenser recovery unit 5, a circulating water cooler 6, a cryogenic water cooler 7, and a gas-liquid separator 8. The circulating water cooler, cryogenic water cooler, and gas-liquid separator are connected in sequence. The inlet of the circulating water cooler is connected to the vapor desorption outlet and vacuum port of the VOCs adsorption resin tower. The gas-liquid separator includes an inlet and an outlet (not labeled in the figure). The outlet of the gas-liquid separator includes a gas outlet 8-2 and a liquid outlet 8-1. The outlet of the cryogenic water cooler is connected to the inlet of the gas-liquid separator. The circulating water cooler and the cryogenic water cooler can perform dual cooling and temperature reduction operations on the thermally desorbed gas, further improving the cooling effect. The liquid outlet of the gas-liquid separator is connected to the condenser and recovery unit. The gas outlet of the gas-liquid separator is connected to the exhaust gas inlet of the VOCs adsorption resin tower through a pipe via a shut-off valve 12. The gas outlet of the gas-liquid separator can directly deliver the cooled desorbed gas to the VOCs adsorption resin tower, or it can deliver the cooled desorbed gas to a vacuum buffer tank for storage, which is convenient for recycling and can also ensure the stability of the system gas pressure. The vacuuming and VOCs recovery assembly includes a vacuum pump 1 and a vacuum buffer tank 2. The inlet of the vacuum buffer tank is connected to the gas-liquid separator and the shut-off valve via a vacuum regulating valve 4, a check valve 11, and a pipeline. The check valve prevents backflow of gas in the vacuum buffer tank, which could damage the system. A pressure sensor 10 is connected to the vacuum buffer tank to monitor the vacuum level in the pipeline, facilitating the monitoring of the system's operating status. The vacuum buffer tank stores the desorbed gas from the VOCs adsorption resin tower. The outlet of the vacuum buffer tank is connected to the exhaust gas inlet of the VOCs adsorption resin tower via the vacuum pump. The vacuum pump transports the desorbed gas from the vacuum buffer tank back to the VOCs adsorption resin tower for recirculation and re-desorption, improving processing efficiency. This recirculation process also improves processing accuracy and reduces production costs.

[0021] In use, external waste gas enters the VOCs adsorption resin tower for adsorption, and some qualified organic waste gas is discharged. After the resin in the tower is saturated, the discharge channel is disconnected, and steam enters the VOCs adsorption resin tower for thermal desorption and regeneration. The discharged thermal desorption gas enters the circulating water condenser through the steam desorption outlet and vacuum interface, and then enters the low-temperature water condenser. Through the double cooling operation, the organic solvent in the thermal desorption gas is precipitated and separated by the gas-liquid separator. The liquid flows into the condensation recovery unit for recovery. At this time, the gas-liquid separator directly transports the cooled desorption gas to the VOCs adsorption resin tower, forming a closed loop of "mixed steam-condensation-VOCs recovery". Alternatively, the gas-liquid separator transports the cooled desorption gas to the vacuum buffer tank through the pipeline, and the gas flows into the vacuum pump, forming a closed loop of "hot and humid gas-condenser-vacuum pump". During resin regeneration, the mixed steam is liquefied and recovered to the condensate recovery unit after passing through two-stage condensers. When the resin cools down, the hot and humid gas is liquefied through the two-stage condensers, and the remaining gas enters the vacuum pump buffer tank and is finally discharged to the resin tower inlet by the vacuum pump. The outlet of the secondary condenser is equipped with a temperature sensor to ensure the condensation effect.

[0022] This invention reduces wastewater volume by more than 90% compared to spray cooling, further reducing secondary pollution. Compared to natural cooling, the time is shortened by more than 50%, and cooling can be completed in 2-3 hours, which indirectly reduces the design scale and construction cost of the adsorption resin tower.

[0023] Preferably, the VOCs adsorption resin tower has a resin inspection port 17 on its tower wall, and is filled with a macroporous high-efficiency resin adsorbent. A multi-point temperature sensor 9 is embedded in the tower wall side for real-time monitoring of the resin temperature in different areas of the tower. Alternatively, the flange connections of the VOCs adsorption resin tower are equipped with corrosion-resistant high-temperature sealing gaskets to prevent VOCs leakage. Alternatively, a pressure sensor is provided at the top of the VOCs adsorption resin tower to monitor the pressure of the resin tower, facilitating the stability and monitoring of the VOCs adsorption resin tower.

[0024] Preferably, the circulating water cooler and the low-temperature water cooler are double-pass shell-and-tube heat exchangers, with mixed steam flowing through the tubes and cooling water flowing through the shell.

[0025] Preferably, the inner wall of the tube side of the condenser is provided with a guide plate (not shown in the figure) to enhance the turbulence effect of the cooling water in the tube side, improve the condensation efficiency, and ensure that more than 85% of the VOCs in the mixed steam are condensed and recovered.

[0026] Preferably, the outlet of the vacuum pump is equipped with a temperature sensor and a pressure sensor (not shown in the figure) to monitor the operation of the vacuum pump, and the top of the vacuum buffer tank is equipped with an explosion-proof safety valve that automatically opens to release pressure when the pressure inside the tank exceeds -0.02MPa (gauge pressure) to ensure the safe operation of the system.

[0027] In this embodiment, the system also includes a PLC controller (not shown in the figure). The temperature sensor is a multi-point temperature sensor, which facilitates temperature data collection and control. The temperature sensor, pressure sensor, liquid level sensor, vacuum pump, vacuum regulating valve, flow control valve, and condenser are all connected to the PLC controller. The PLC controller can automatically adjust the vacuum pump power, speed, and vacuum regulating valve opening based on the signals fed back from each sensor, thereby improving the operational stability of the device.

[0028] Preferably, temperature sensors and pressure sensors are connected to each other in the system, including the VOCs adsorption resin tower, the vacuum and VOCs recovery components, and the combined cooling components, to facilitate monitoring of the system's operating conditions.

[0029] Although embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will understand that various substitutions, variations, and modifications are possible without departing from the spirit and scope of the present invention and the appended claims. Therefore, the scope of the present invention is not limited to the contents disclosed in the embodiments.

Claims

1. A resin adsorption VOCs waste gas treatment system with a steam desorption and subsequent cooling system, characterized in that: The system includes a VOCs adsorption resin tower, a vacuum and VOCs recovery assembly, and a combined cooling assembly. The VOCs adsorption resin tower contains VOCs adsorption resin. The bottom of the tower has a vapor desorption outlet, a vacuum interface, and a waste gas inlet. The top of the tower has a waste gas outlet and a steam inlet. The waste gas inlet is connected to external organic waste gas via a pipeline, and the steam inlet is connected to external hot steam. The waste gas outlet discharges filtered organic waste gas, while steam enters the tower through the steam inlet. The combined cooling assembly includes an inlet and an outlet. The outlet of the combined cooling assembly includes a first outlet and a second outlet. The inlet of the combined cooling assembly is connected to the vapor desorption outlet and the vacuum interface of the VOCs adsorption resin tower, and the first outlet is also connected to the waste gas inlet of the VOCs adsorption resin tower. The second outlet of the combined cooling component is connected to the inlet of the vacuum and VOCs recovery component, and the outlet of the vacuum and VOCs recovery component is connected to the vacuum port of the VOCs adsorption resin tower. The combined cooling component can cool the desorption gas generated by the thermal desorption of the VOCs adsorption resin tower and recover the condensed organic solvent, thereby improving the processing efficiency. The desorption gas can be returned to the VOCs adsorption resin tower. The vacuum and VOCs recovery component can collect a portion of the cooled desorption gas and return it to the VOCs adsorption resin tower for recycling and re-desorption.

2. The system according to claim 1, characterized in that: The combined cooling assembly includes a condenser recovery unit, a circulating water cooler, a cryogenic water cooler, and a gas-liquid separator. The circulating water cooler, cryogenic water cooler, and gas-liquid separator are connected in sequence. The inlet of the circulating water cooler is connected to the vapor desorption outlet and vacuum port of the VOCs adsorption resin tower. The gas-liquid separator includes an inlet and an outlet, and the outlet of the gas-liquid separator includes a gas outlet and a liquid outlet. The outlet of the cryogenic water cooler is connected to the inlet of the gas-liquid separator. The circulating water cooler and the cryogenic water cooler can perform dual cooling and temperature reduction operations on the thermally desorbed gas. The liquid outlet of the gas-liquid separator is connected to the condenser and recovery unit. The gas outlet of the gas-liquid separator is connected to the exhaust gas inlet of the VOCs adsorption resin tower through a pipe via a shut-off valve and a vacuum regulating valve. The gas outlet of the gas-liquid separator can directly deliver the cooled desorbed gas to the VOCs adsorption resin tower, or it can deliver the cooled desorbed gas to a vacuum buffer tank for storage. The vacuuming and VOCs recovery assembly includes a vacuum pump and a vacuum buffer tank. The inlet of the vacuum buffer tank is connected to the gas-liquid separator and the shut-off valve via a vacuum regulating valve, a pressure sensor, and a check valve. The check valve prevents backflow of gas in the vacuum buffer tank, and the pressure sensor monitors the vacuum level in the pipeline. The vacuum buffer tank stores the desorbed gas from the VOCs adsorption resin tower. The outlet of the vacuum buffer tank is connected to the exhaust gas inlet of the VOCs adsorption resin tower via the vacuum pump. The vacuum pump transports the desorbed gas from the vacuum buffer tank back to the VOCs adsorption resin tower for recirculation and re-desorption.

3. The system according to claim 1, characterized in that: The VOCs adsorption resin tower has a resin inspection port on its tower wall, and is filled with a macroporous high-efficiency resin adsorbent. A multi-point temperature sensor is embedded in the side of the tower wall; or, the flange connections of the VOCs adsorption resin tower are equipped with corrosion-resistant high-temperature sealing gaskets; or, a pressure sensor is installed at the top of the VOCs adsorption resin tower to monitor the pressure of the resin tower.

4. The system according to claim 2, characterized in that: The circulating water cooler and the low-temperature water cooler are double-pass shell-and-tube heat exchangers, with mixed steam introduced into the tubes and cooling water introduced into the shell.

5. The system according to claim 2, characterized in that: The inner wall of the tube side of the condenser recovery unit is provided with a flow guide plate.

6. The system according to claim 2, characterized in that: The vacuum pump outlet is equipped with a temperature sensor and a pressure sensor to monitor the operation of the vacuum pump. The top of the vacuum buffer tank is equipped with an explosion-proof safety valve that automatically opens to release pressure when the pressure inside the tank exceeds -0.02MPa (gauge pressure).

7. The system according to claim 2, characterized in that: The system also includes a PLC controller. The temperature sensor is a multi-point temperature sensor, which facilitates temperature data collection and control. The temperature sensor, pressure sensor, liquid level sensor, vacuum pump, vacuum regulating valve, flow control valve and condenser are all connected to the PLC controller. The PLC controller can automatically adjust the vacuum pump power, speed and vacuum regulating valve opening based on the signals fed back from each sensor.

8. The system according to claim 1, characterized in that: Temperature and pressure sensors are connected to each other in the VOCs adsorption resin tower, vacuum and VOCs recovery components, and combined cooling components in the system.

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