Heat accumulating type rotating bed adsorption recovery device

Abstract

The utility model discloses a heat accumulating type rotating bed adsorption recovery device, which comprises an adsorption rotating wheel, a heat accumulating type rotating bed, a heat accumulating type rotating bed, a heat accumulating type rotating bed, a heat accumulating type rotating bed, a heat accumulating type rotating bed and a heat accumulating type heat accumulating type rotating bed, and is characterized in that the adsorption rotating wheel comprises an adsorption area, a desorption area and a cooling area; an outlet of the waste gas inlet system is communicated with an inlet of the adsorption area, and an outlet of the adsorption area is communicated with an inlet of the waste gas outlet system; an outlet of the desorption area is communicated with an inlet of the condensation system, and an outlet of the condensation system is communicated with an inlet of the cooling area; an outlet of the cooling area is communicated with an inlet of the heating system, and an outlet of the heating system is communicated with an inlet of the desorption area. The system can meet the emission standard of VOCs, effectively utilizes energy consumption in the desorption process, has higher heat utilization efficiency, has obvious energy-saving advantages, and meanwhile, is lower in equipment investment.

Description

Technical Field

[0001] This application belongs to the technical field of waste gas treatment. Specifically, it relates to a regenerative rotating bed adsorption and recovery device. Background Art

[0002] In the prior art, volatile organic compounds (VOCs) are a general term for a series of volatile, flammable, and toxic organic compounds. VOCs not only cause a great waste of resources but also serious air pollution. The main sources of VOCs are emissions during the drying and coating processes in fields such as painting, printing, fibers, resins, and the chemical industry. The purification treatment technical principles of VOCs include condensation, absorption, adsorption, combustion, catalytic hydrogenation, etc. Among them, condensation and absorption purify VOCs through resource recovery, but the purification efficiency is not high, and it is difficult to meet the requirements of national or local ultra-clean emissions of VOCs. Combustion and catalytic oxidation convert organic substances into harmless carbon dioxide and water through the reaction with oxygen. Although the efficiency is high, it will cause waste of resources. The waste gas adsorption and recovery technology is becoming more and more popular. The adsorption and recovery process is a more environmentally friendly solvent recovery technology, and the adsorption and desorption recovery process with nitrogen as the desorption medium has been widely used in the market due to its advantages such as no production of wastewater, no secondary pollution, lower water content in the recovered solvent, higher quality of the recovered solvent, and wider application range.

[0003] Although the existing fixed bed adsorption and recovery system solves the problem of meeting the waste gas emission standards to a certain extent, the existing fixed bed adsorption and recovery system has a long desorption time and a complex process route. The fixed bed adsorption and recovery system only has adsorption performance and cannot effectively utilize the energy consumption during the desorption process. The energy consumption loss is as high as 50% - 80%, and additional heating equipment is added, resulting in a corresponding increase in investment costs. Therefore, how to protect the environment, reduce energy consumption, and meet the VOCs emission standards is a technical problem that needs to be urgently solved by those skilled in the art.

[0004] In view of this, the present application is specifically proposed. Utility Model Content

[0005] The technical problem to be solved by this application is to overcome the deficiencies of the prior art and provide a regenerative rotating bed adsorption and recovery device, which can meet the VOCs emission standards, effectively utilize the energy consumption during the desorption process, has a higher heat utilization efficiency, has obvious energy-saving advantages, and at the same time has a lower equipment investment.

[0006] To solve the above technical problems, the basic concept of the technical solution adopted in this application is:

[0007] A regenerative rotating bed adsorption and recovery device, comprising:

[0008] An adsorption rotor, the adsorption rotor including an adsorption zone, a desorption zone, and a cooling zone;

[0009] An exhaust gas inlet system, the outlet of the exhaust gas inlet system being communicated with the inlet of the adsorption zone;

[0010] An exhaust gas outlet system, the outlet of the adsorption zone being communicated with the inlet of the exhaust gas outlet system;

[0011] A condensation system, the outlet of the desorption zone being communicated with the inlet of the condensation system, and the outlet of the condensation system being communicated with the inlet of the cooling zone;

[0012] A heating system, the outlet of the cooling zone being communicated with the inlet of the heating system, and the outlet of the heating system being communicated with the inlet of the desorption zone.

[0013] Furthermore: The adsorption rotor is filled with a heat storage material.

[0014] In some alternative embodiments: It further includes:

[0015] A nitrogen supply pipeline, the outlet of the nitrogen supply pipeline being communicated with the condensation system;

[0016] A purge exhaust gas pipeline, the inlet of the purge exhaust gas pipeline being communicated with the heating system, and the outlet of the purge exhaust gas pipeline being communicated with the exhaust gas inlet system.

[0017] Furthermore: The exhaust gas inlet system includes an exhaust gas inlet pipeline. Along the gas flow direction, a temperature and humidity adjustment device, a filter, an adsorption fan, and a first control valve are sequentially arranged on the exhaust gas inlet pipeline. The outlet of the exhaust gas inlet pipeline is communicated with the inlet of the adsorption zone.

[0018] In some alternative embodiments: The exhaust gas outlet system includes an exhaust gas outlet pipeline. The outlet of the adsorption zone is communicated with the inlet of the exhaust gas outlet pipeline, and a second control valve is arranged on the exhaust gas outlet pipeline.

[0019] Furthermore: The condensation system includes a condensation pipeline. The outlet of the desorption zone is communicated with the inlet of the condensation pipeline, and the outlet of the condensation pipeline is communicated with the inlet of the cooling zone. Along the gas flow direction, a desorption fan, a third control valve, an oxygen concentration detection unit, a condenser, a gas-liquid separator, and a fourth control valve are sequentially arranged on the condensation pipeline. The gas-liquid separator is communicated with a waste liquid storage tank.

[0020] Furthermore: A sixth control valve is arranged on the nitrogen supply pipeline, and the outlet of the nitrogen supply pipeline is communicated with the condensation pipeline between the inlet of the condensation pipeline and the desorption fan.

[0021] Further: The heating system includes a heating pipeline. The outlet of the cooling zone is communicated with the inlet of the heating pipeline. The outlet of the heating pipeline is communicated with the inlet of the desorption zone. A heater is provided on the heating pipeline.

[0022] Further: A fifth control valve is provided on the purge waste gas pipeline. The inlet of the purge waste gas pipeline is communicated with the heating pipeline between the inlet of the heating pipeline and the heater. The outlet of the purge waste gas pipeline is communicated with the waste gas inlet pipeline between the temperature and humidity adjustment device and the filter.

[0023] The present application also provides a heat storage rotary bed adsorption and recovery method based on the above-mentioned device. The heat storage material in the desorption zone absorbs and stores the heat released during the desorption process. When the adsorption wheel rotates into the cooling zone, the cooling gas purges and cools the cooling zone. The heat stored by the heat storage material in the cooling zone is released. The cooling gas at the outlet of the cooling zone absorbs heat and then purges and desorbs the desorption zone.

[0024] After adopting the above technical solution, the present application has the following beneficial effects compared with the prior art.

[0025] The present application provides a heat storage rotary bed adsorption and recovery device and method. The outlet of the desorption zone of the heat storage rotary bed adsorption and recovery device is communicated with the inlet of the condensation system. The outlet of the condensation system is communicated with the inlet of the cooling zone. The outlet of the cooling zone is communicated with the inlet of the heating system. The outlet of the heating system is communicated with the inlet of the desorption zone. The condensation system, the heating system, the desorption zone, and the cooling zone form a closed pipeline channel. The desorption zone of the adsorption wheel utilizes desorption endotherm. When the adsorption wheel rotates into the cooling zone, the cooling gas purges and cools the cooling zone. The heat in the cooling zone is released. The temperature of the cooling gas at the outlet of the cooling zone rises. After heating, it purges and desorbs the desorption zone. By circulating in this way, the energy consumption during the desorption process can be effectively utilized, with higher heat utilization efficiency, obvious energy-saving advantages, and lower equipment investment.

[0026] The following further describes in detail the specific embodiments of the present application with reference to the accompanying drawings. Description of the Drawings

[0027] The accompanying drawings, as part of the present application, are used to provide a further understanding of the present application. The schematic embodiments and descriptions thereof of the present application are used to explain the present application, but do not constitute an improper limitation to the present application. Obviously, the accompanying drawings in the following description are only some embodiments. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts. In the accompanying drawings:

[0028] Figure 1 This is a schematic structural diagram of a regenerative rotating bed adsorption recovery device provided by the present application.

[0029] In the figure: 1. Waste gas inlet pipeline; 2. Temperature and humidity adjustment device; 3. Filter; 4. Adsorption fan; 5. First control valve; 6. Waste gas outlet pipeline; 7. Second control valve; 8. Desorption fan; 9. Third control valve; 10. Oxygen concentration detection unit; 11. Condenser; 12. Condensation pipeline; 13. Gas-liquid separator; 14. Fourth control valve; 15. Waste liquid storage tank; 16. Sixth control valve; 17. Nitrogen supply pipeline; 18. Purge waste gas pipeline; 19. Fifth control valve; 20. Heating pipeline; 21. Heater; 22. Adsorption zone; 23. Desorption zone; 24. Cooling zone.

[0030] It should be noted that these drawings and text descriptions are not intended to limit the scope of the concept of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. Detailed implementation manners

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. The following embodiments are used to illustrate the present application but are not used to limit the scope of the present application.

[0032] In the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0033] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0034] As Figure 1 shown, the present application provides a regenerative rotating bed adsorption recovery device, and the regenerative rotating bed adsorption recovery device includes:

[0035] An adsorption rotor, which includes an adsorption zone 22, a desorption zone 23, and a cooling zone 24;

[0036] An exhaust gas inlet system, the outlet of which is communicated with the inlet of the adsorption zone 22;

[0037] An exhaust gas outlet system, the outlet of the adsorption zone 22 is communicated with the inlet of the exhaust gas outlet system;

[0038] A condensation system, the outlet of the desorption zone 23 is communicated with the inlet of the condensation system, and the outlet of the condensation system is communicated with the inlet of the cooling zone 24;

[0039] A heating system, the outlet of the cooling zone 24 is communicated with the inlet of the heating system, and the outlet of the heating system is communicated with the inlet of the desorption zone 23.

[0040] Specifically:

[0041] The adsorption wheel includes an adsorption zone 22, a desorption zone 23, and a cooling zone 24. The exhaust gas is low to medium concentration exhaust gas from different industries, and the VOCs concentration range in the exhaust gas is generally 1 - 10 g / m 3 , after the exhaust gas is pretreated by the exhaust gas inlet system, it passes through the outlet of the exhaust gas inlet system, and then enters the adsorption zone 22 of the adsorption wheel through the inlet of the adsorption zone 22. The adsorption zone 22 adsorbs VOCs in the exhaust gas, and the VOCs concentration in the adsorbed exhaust gas < 50 mg / m 3 , the exhaust gas reaches the emission standard, passes through the outlet of the adsorption zone 22, then enters the inlet of the exhaust gas outlet system, and is discharged to the atmosphere from the outlet of the exhaust gas outlet system.

[0042] The adsorption wheel with adsorbed VOCs continuously rotates into the desorption zone 23. When the adsorption wheel rotates to the desorption zone 23, the VOCs adsorbed on the adsorption wheel are desorbed by the high-temperature desorption gas. The desorbed VOCs are carried by the high-temperature desorption gas and leave the desorption zone 23. Through the outlet of the desorption zone 23, they enter the condensation system through the inlet of the condensation system. The condensation system cools the incoming desorption gas, and the condensed waste liquid containing VOCs is discharged from the condensation system. The cooled gas after condensation passes through the outlet of the condensation system, then enters the cooling zone 24 through the inlet of the cooling zone 24 to cool and regenerate the adsorption wheel.

[0043] The desorption zone 23 of the adsorption wheel utilizes desorption endotherm. When the adsorption wheel rotates into the cooling zone 24, the cooling gas purges and cools the cooling zone 24, and the heat in the cooling zone 24 is released. The temperature of the cooling gas at the outlet of the cooling zone 24 rises. The cooling gas with increased temperature passes through the outlet of the cooling zone 24, then enters the heating system through the inlet of the heating system for heating. After heating, high-temperature desorption gas is generated. The high-temperature desorption gas passes through the outlet of the heating system, then enters the desorption zone 23 through the inlet of the desorption zone 23 to perform high-temperature desorption gas desorption on the desorption zone 23.

[0044] The condensation system, the heating system, the desorption zone 23, and the cooling zone 24 form a closed-loop pipeline channel. The desorption zone 23 of the adsorption wheel utilizes desorption endotherm. When the adsorption wheel rotates into the cooling zone 24, the cooling gas purges and cools the cooling zone 24, and the heat in the cooling zone 24 is released. The temperature of the cooling gas at the outlet of the cooling zone 24 rises, and after heating, it purges and desorbs the desorption zone 23. By cycling in this way, the energy consumption in the desorption process can be effectively utilized, with higher heat utilization efficiency, obvious energy-saving advantages, and lower equipment investment.

[0045] Furthermore, the adsorption wheel is filled with heat storage material. Filling the heat storage material in the adsorption wheel can better absorb and store the heat released during the desorption process, can make the temperature of the cooling gas at the outlet of the cooling zone 24 rise higher, reduce the consumption of the heating system, have higher heat utilization efficiency, and have obvious energy-saving advantages.

[0046] In some alternative embodiments, as Figure 1 shown, the present application provides a regenerative rotating bed adsorption recovery device, and the regenerative rotating bed adsorption recovery device further includes:

[0047] A nitrogen supply pipeline 17, and the outlet of the nitrogen supply pipeline 17 is communicated with the condensation system.

[0048] A purge waste gas pipeline 18, the inlet of the purge waste gas pipeline 18 is communicated with the heating system, and the outlet of the purge waste gas pipeline 18 is communicated with the waste gas inlet system.

[0049] Specifically:

[0050] When the adsorption zone 22 reaches adsorption saturation, the adsorption wheel rotates into the desorption zone 23. First, nitrogen is introduced. Nitrogen enters the nitrogen supply pipeline 17 through the inlet of the nitrogen supply pipeline 17, and then enters the condensation system through the outlet of the nitrogen supply pipeline 17. Nitrogen purges in the condensation system, the heating system, the desorption zone 23, and the cooling zone 24, displacing the purge waste gas containing oxygen and VOCs. Since the inlet of the purge waste gas pipeline 18 is communicated with the heating system, the purge waste gas enters the purge waste gas pipeline 18 through the inlet of the purge waste gas pipeline 18, and then enters the waste gas inlet system through the outlet of the purge waste gas pipeline 18. Through the outlet of the waste gas inlet system, and then through the inlet of the adsorption zone 22, it enters the adsorption zone 22 of the adsorption wheel. The adsorption zone 22 adsorbs the VOCs in the purge waste gas, and the concentration of VOCs in the adsorbed purge waste gas < 50 mg / m 3 , and the purge waste gas reaches the emission standard, passes through the outlet of the adsorption zone 22, and then through the inlet of the waste gas outlet system, and is discharged to the atmosphere from the outlet of the waste gas outlet system.

[0051] The above structure can not only purge the regenerative rotating bed adsorption recovery device with nitrogen, reduce the oxygen concentration in the regenerative rotating bed adsorption recovery device, and ensure the safe operation of the regenerative rotating bed adsorption recovery device, but also adsorb and treat the purged waste gas in the adsorption zone 22, and discharge it to the atmosphere from the outlet of the waste gas outlet system after reaching the emission standard, which is safe and environmentally friendly.

[0052] In some alternative embodiments, such as Figure 1 As shown, the present application provides a regenerative rotating bed adsorption recovery device. The waste gas inlet system of the regenerative rotating bed adsorption recovery device includes a waste gas inlet pipeline 1. Along the gas flow direction, a temperature and humidity adjustment device 2, a filter 3, an adsorption fan 4, and a first control valve 5 are sequentially arranged on the waste gas inlet pipeline 1. The outlet of the waste gas inlet pipeline 1 is communicated with the inlet of the adsorption zone 22.

[0053] Specifically: The waste gas comes from low and medium concentration waste gas in different industries. The concentration range of VOCs in the waste gas is generally 1-10 g / m 3 , and the waste gas enters the waste gas inlet pipeline 1 through the inlet of the waste gas inlet pipeline 1. First, it enters the temperature and humidity adjustment device 2 to adjust the temperature of the waste gas to 30-40 °C, and then enters the filter 3 to remove the particulate matter existing in the waste gas. The filtered waste gas is provided with air flow power by the adsorption fan 4, and the waste gas sequentially passes through the first control valve 5, the outlet of the waste gas inlet pipeline 1, and the inlet of the adsorption zone 22 to enter the adsorption zone 22 of the adsorption wheel, and the waste gas is adsorbed and treated. The first control valve 5 can control the on-off of the waste gas inlet pipeline 1 and control the air flow rate of the waste gas entering the adsorption zone 22 of the adsorption wheel.

[0054] Optionally, the waste gas outlet system includes a waste gas outlet pipeline 6. The outlet of the adsorption zone 22 is communicated with the inlet of the waste gas outlet pipeline 6, and a second control valve 7 is arranged on the waste gas outlet pipeline 6.

[0055] When the adsorption zone 22 adsorbs VOCs in the waste gas and the concentration of VOCs in the adsorbed waste gas < 50 mg / m 3 , the waste gas reaches the emission standard, passes through the outlet of the adsorption zone 22, enters the waste gas outlet pipeline 6 through the inlet of the waste gas outlet pipeline 6, and is then discharged to the atmosphere through the outlet of the waste gas outlet pipeline 6. A second control valve 7 is arranged on the waste gas outlet pipeline 6. The second control valve 7 can control the on-off of the waste gas outlet pipeline 6 and control the air flow rate of the purified waste gas discharged to the atmosphere.

[0056] In some alternative embodiments, such as Figure 1As shown in the figure, the present application provides a regenerative rotary bed adsorption recovery device. The condensation system of the regenerative rotary bed adsorption recovery device includes a condensation pipeline 12. The outlet of the desorption zone 23 is communicated with the inlet of the condensation pipeline 12, and the outlet of the condensation pipeline 12 is communicated with the inlet of the cooling zone 24. Along the gas flow direction, a desorption fan 8, a third control valve 9, an oxygen concentration detection unit 10, a condenser 11, a gas-liquid separator 13, and a fourth control valve 14 are sequentially arranged on the condensation pipeline 12. The gas-liquid separator 13 is communicated with a waste liquid storage tank 15.

[0057] The adsorption wheel adsorbed with VOCs continuously rotates into the desorption zone 23. When the adsorption wheel rotates to the desorption zone 23, the VOCs adsorbed on the adsorption wheel are desorbed by high-temperature desorption gas. The temperature of the high-temperature desorption gas is usually 200 °C, and the specific temperature can be selected according to needs. The desorbed VOCs are carried by the high-temperature desorption gas and leave the desorption zone 23. Through the outlet of the desorption zone 23, they enter the condensation pipeline 12 through the inlet of the condensation pipeline 12. The desorption gas at the outlet of the desorption zone 23 contains a large amount of VOCs and a small amount of moisture. The desorption fan 8 provides the gas flow power, and it passes through the third control valve 9 and the oxygen concentration detection unit 10 in sequence and is sent into the condenser 11. The third control valve 9 can control the on-off of the condensation pipeline 12 and control the gas flow rate entering the condenser 11 in the condensation pipeline 12.

[0058] The condenser 11 uses circulating water for condensation, and the outlet temperature of the condenser 11 is 10 - 20 °C. The condensed desorption gas becomes a cooling gas and enters the gas-liquid separator 13 for gas-liquid separation operation, and the condensed waste liquid is discharged into the waste liquid storage tank 15. The condensed cooling gas passes through the fourth control valve 14, passes through the outlet of the condensation pipeline 12 and then enters the cooling zone 24 through the inlet of the cooling zone 24 to cool and regenerate the adsorption wheel.

[0059] The fourth control valve 14 can control the on-off of the condensation pipeline 12 and control the gas flow rate of the condensed cooling gas in the condensation pipeline 12 entering the cooling zone 24.

[0060] Optionally, the heating system includes a heating pipeline 20. The outlet of the cooling zone 24 is communicated with the inlet of the heating pipeline 20, and the outlet of the heating pipeline 20 is communicated with the inlet of the desorption zone 23. A heater 21 is arranged on the heating pipeline 20.

[0061] In the desorption zone 23 of the adsorption wheel, desorption endotherm is utilized. When the adsorption wheel rotates and enters the cooling zone 24, the cooling gas purges and cools the cooling zone 24, and the heat in the cooling zone 24 is released, so that the temperature of the cooling gas at the outlet of the cooling zone 24 increases. The cooling gas with increased temperature passes through the outlet of the cooling zone 24 and then enters the heating pipeline 20 through the inlet of the heating pipeline 20. A heater 21 is arranged on the heating pipeline 20. The cooling gas with increased temperature is heated by the heater 21 to generate high-temperature desorption gas. The high-temperature desorption gas passes through the outlet of the heating pipeline 20 and then enters the desorption zone 23 through the inlet of the desorption zone 23 to perform high-temperature desorption gas desorption on the desorption zone 23.

[0062] In some optional embodiments, as Figure 1 shown, the present application provides a regenerative rotating bed adsorption and recovery device. A sixth control valve 16 is arranged on the nitrogen supply pipeline 17 of the regenerative rotating bed adsorption and recovery device, and the outlet of the nitrogen supply pipeline 17 is communicated with the condensation pipeline 12 between the inlet of the condensation pipeline 12 and the desorption fan 8.

[0063] Optionally, a fifth control valve 19 is arranged on the purge waste gas pipeline 18. The inlet of the purge waste gas pipeline 18 is communicated with the heating pipeline 20 between the inlet of the heating pipeline 20 and the heater 21, and the outlet of the purge waste gas pipeline 18 is communicated with the waste gas inlet pipeline 1 between the humidity and temperature adjustment device 2 and the filter 3.

[0064] When the adsorption zone 22 reaches adsorption saturation, the adsorption wheel rotates into the desorption zone 23. First, nitrogen is introduced. The nitrogen enters the nitrogen supply pipeline 17 through the inlet of the nitrogen supply pipeline 17. A sixth control valve 16 is arranged on the nitrogen supply pipeline 17. The sixth control valve 16 can control the on-off of the nitrogen supply pipeline 17 and control the gas flow rate in the nitrogen supply pipeline 17.

[0065] The nitrogen enters the condensation pipeline 12 through the outlet of the nitrogen supply pipeline 17. The desorption fan 8 and the adsorption fan 4 are turned on simultaneously. The nitrogen sequentially passes through the desorption fan 8, the third control valve 9, the oxygen concentration detection unit 10, the condenser 11, the gas-liquid separator 13, the fourth control valve 14, the cooling zone 24, the heating pipeline 20, the heater 21, and the desorption zone 23 for cyclic purging, displacing the purge waste gas containing oxygen and VOCs. Since a fifth control valve 19 is arranged on the purge waste gas pipeline 18, the inlet of the purge waste gas pipeline 18 is communicated with the heating pipeline 20 between the inlet of the heating pipeline 20 and the heater 21, and the outlet of the purge waste gas pipeline 18 is communicated with the waste gas inlet pipeline 1 between the humidity and temperature adjustment device 2 and the filter 3. The fifth control valve 19 can control the on-off of the purge waste gas pipeline 18 and control the gas flow rate in the purge waste gas pipeline 18.

[0066] The purging waste gas enters the purging waste gas pipeline 18 through the inlet of the waste gas pipeline, and then enters the waste gas inlet pipeline 1 through the outlet of the purging waste gas pipeline 18. The purging waste gas then passes through the filter 3, and the air flow power is provided by the adsorption fan 4. The purging waste gas sequentially passes through the first control valve 5, the outlet of the waste gas inlet pipeline 1, and the inlet of the adsorption zone 22 of the adsorption wheel to enter the adsorption zone 22 of the adsorption wheel, and the purging waste gas is subjected to adsorption treatment. The adsorption zone 22 adsorbs VOCs in the purging waste gas, and the concentration of VOCs in the purged waste gas after adsorption < 50mg / m 3 , and the purging waste gas reaches the emission standard and passes through the outlet of the adsorption zone 22, enters the waste gas outlet pipeline 6 through the inlet of the waste gas outlet pipeline 6, and is then discharged to the atmosphere through the outlet of the waste gas outlet pipeline 6.

[0067] Optionally, the oxygen concentration detection unit 10 is an oxygen concentration detector for monitoring the oxygen concentration in the regenerative rotating bed adsorption recovery device. After the oxygen concentration reaches the target safety value, the nitrogen protection is turned off. The target safety value is preferably an oxygen content < 5%.

[0068] Optionally, nitrogen is replenished in real time according to the change of the oxygen concentration, and the oxygen content is strictly controlled to ensure the safe and stable operation of the regenerative rotating bed adsorption recovery device.

[0069] Optionally, two oxygen concentration detectors are set, and the one-out-of-two form can prevent one of the oxygen concentration detectors from malfunctioning, resulting in inaccurate monitoring and affecting the safe production of the regenerative rotating bed adsorption recovery device.

[0070] The above structure can not only purge the regenerative rotating bed adsorption recovery device, reduce the oxygen concentration in the regenerative rotating bed adsorption recovery device, ensure the safe operation of the regenerative rotating bed adsorption recovery device, but also perform adsorption treatment on the purging waste gas in the adsorption zone 22, and discharge it to the atmosphere through the outlet of the waste gas outlet system after reaching the emission standard, which is safe and environmentally friendly.

[0071] It should be noted that the emission standard is the industry standard.

[0072] It should be noted that the main components of the regenerative material mentioned in this application are regenerative materials such as Al2O3, SiC, and SiO2, or materials with high adsorption efficiency and regenerative performance, or a combination of multiple regenerative materials.

[0073] This application also provides a regenerative rotating bed adsorption recovery method, which is implemented based on any one of the above regenerative rotating bed adsorption recovery devices.

[0074] The heat storage material in the desorption zone 23 absorbs and stores the heat released during the desorption process. When the adsorption wheel rotates into the cooling zone 24, the cooling gas purges and cools the cooling zone 24, and the heat stored in the heat storage material in the cooling zone 24 is released. The cooling gas at the outlet of the cooling zone 24 absorbs heat and then purges and desorbs the desorption zone 23.

[0075] Specifically:

[0076] When the adsorption wheel reaches the desorption zone 23, the VOCs adsorbed on the adsorption wheel are desorbed by the high-temperature desorption gas. The heat storage material in the desorption zone 23 absorbs and stores the heat released during the desorption process, and the heat storage material conducts heat storage and heat exchange in the desorption zone 23. When the adsorption wheel rotates into the cooling zone 24, the cooling gas purges and cools the cooling zone 24, and the heat stored in the heat storage material in the cooling zone 24 is released. After the cooling gas in the cooling zone 24 absorbs heat, the temperature of the cooling gas at the outlet of the cooling zone 24 rises to 100 - 180 °C.

[0077] To improve the desorption efficiency, the cooling gas with increased temperature is heated by the heater 21 to generate high-temperature desorption gas. The high-temperature desorption gas is heated to 200 °C and then enters the desorption zone 23 again to purge and desorb the desorption zone 23.

[0078] A heat storage rotary bed adsorption and recovery method provided by this application has the function of heat storage and heat exchange. The desorption zone 23 and the cooling zone 24 can achieve efficient heat exchange inside the adsorption wheel. Through continuous rotation, the exchange of low-temperature and high-temperature heat is realized, the temperature of the cooling zone 24 is reduced, the adsorption of VOCs in the cooling zone 24 is reduced, the cooling efficiency is improved, and at the same time, heat is provided for the desorption zone 23, further improving the desorption efficiency, making the heat utilization efficiency of the heat storage rotary bed adsorption and recovery device high and the overall energy consumption of the heat storage rotary bed adsorption and recovery device saved. For multiple cycles to meet the exhaust gas emission standards, this heat storage rotary bed adsorption and recovery device can adjust the areas of the adsorption zone 22, the desorption zone 23, and the cooling zone 24 according to the different components and concentrations of the exhaust gas, and set multiple desorption zones 23 and cooling zones 24, so as to achieve the purpose of adjusting the desorption concentration multiple and the cooling temperature.

[0079] As Figure 1 shown, this application provides a heat storage rotary bed adsorption and recovery device and method, which will be explained below with a specific embodiment.

[0080] The exhaust gas from a certain coating production and drying process has an exhaust gas volume of 50000 Nm 3 / h, the solvent components are ethyl acetate, butyl acetate, and xylene, the total exhaust gas concentration is 3000 mg / m 3 , the exhaust gas emission temperature is 60 °C, the relative humidity is 20%, and it is required that the exhaust gas emission concentration after treatment < 30 mg / m 3 .

[0081] The waste gas enters the waste gas inlet pipeline 1 through the inlet of the waste gas inlet pipeline 1. First, it enters the temperature and humidity adjustment device 2 to adjust the temperature of the waste gas to 40 °C, and then enters the filter 3 to remove the particulate matter existing in the waste gas. The filtered waste gas is provided with air flow power by the adsorption fan 4. The waste gas successively passes through the first control valve 5, the outlet of the waste gas inlet pipeline 1, and the inlet of the adsorption zone 22 of the adsorption wheel to enter the adsorption zone 22 of the adsorption wheel for adsorption treatment of the waste gas. The emission concentration of the adsorbed waste gas < 30 mg / m 3 , and the waste gas reaches the emission standard. It passes through the outlet of the adsorption zone 22, enters the waste gas outlet pipeline 6 through the inlet of the waste gas outlet pipeline 6, and is then discharged to the atmosphere through the outlet of the waste gas outlet pipeline 6. An on-line monitoring system is set at the outlet of the adsorption zone 22 to detect the emission concentration in real time. When the emission concentration reaches the design target, the adsorption zone 22 of the adsorption wheel is transferred to the desorption zone 23. First, nitrogen is introduced, and the desorption fan 8 and the adsorption fan 4 are started simultaneously. Nitrogen enters the nitrogen supply pipeline 17 through the inlet of the nitrogen supply pipeline 17, and then enters the condensation system through the outlet of the nitrogen supply pipeline 17. Nitrogen is purged in the condensation system, heating system, desorption zone 23, and cooling zone 24. The purged waste gas containing oxygen and VOCs is discharged. Since the inlet of the purge waste gas pipeline 18 is connected to the heating system, the purge waste gas enters the purge waste gas pipeline 18 through the inlet of the purge waste gas pipeline 18, and then enters the waste gas inlet system through the outlet of the purge waste gas pipeline 18. Through the outlet of the waste gas inlet system, and then enters the adsorption zone 22 of the adsorption wheel through the inlet of the adsorption zone 22 for adsorption treatment of the purge waste gas. The emission concentration of the adsorbed purge waste gas < 30 mg / m 3 , and the purge waste gas reaches the emission standard. It passes through the outlet of the adsorption zone 22, enters the waste gas outlet pipeline 6 through the inlet of the waste gas outlet pipeline 6, and is then discharged to the atmosphere through the outlet of the waste gas outlet pipeline 6. Two oxygen concentration detectors are set, and an either / or oxygen concentration detector is set to monitor the oxygen concentration in the regenerative rotating bed adsorption recovery device. When the oxygen content < 5%, stop nitrogen filling protection and close the sixth control valve 16 and the fifth control valve 19.

[0082] During the desorption process, the heat storage material in the desorption zone 23 absorbs and stores the heat released during the desorption process, and the heat storage material performs heat storage and heat exchange in the desorption zone 23. The desorption air volume is 5000 Nm 3 / h, the desorption outlet concentration is 230 g / m 3 , and the desorbed gas enters the condenser 11 by the desorption fan 8. The temperature after condensation is 10 °C, and the waste gas concentration of the cooled gas after condensation is 220 g / m 3, the condensed cooling gas enters the gas-liquid separator 13, and the condensed waste liquid is discharged into the waste liquid storage tank 15. The condensed cooling gas passes through the outlet of the condensation pipeline 12 and then enters the cooling zone 24 through the inlet of the cooling zone 24 to cool and regenerate the adsorption wheel. The cooling gas purges and cools the cooling zone 24, and the heat stored in the heat storage material in the cooling zone 24 is released. After the cooling gas in the cooling zone 24 absorbs heat, the temperature of the cooling gas at the outlet of the cooling zone 24 rises to 100-180 °C. To improve the desorption efficiency, the cooling gas with increased temperature is heated by the heater 21 to generate high-temperature desorption gas, and the high-temperature desorption gas is heated to 200 °C and then enters the desorption zone 23 again to purge and desorb the desorption zone 23.

[0083] The desorption zone 23 and the cooling zone 24 of the adsorption wheel have a heat storage and heat exchange function, and the exchange of low-temperature and high-temperature heat is realized through continuous rotation, reducing the temperature of the cooling zone 24, reducing the adsorption of waste gas in the cooling zone 24, improving the cooling efficiency, and at the same time providing heat for the desorption zone 23 to further improve the desorption efficiency. After heat exchange, the temperature of the cooling gas at the outlet of the cooling zone 24 rises to 100-180 °C, and then enters the heater 21 to be heated to 200 °C and enters the desorption zone 23 again. The desorption time is shortened to 30 minutes. The heat storage and heat exchange function of the adsorption wheel of the regenerative rotating bed adsorption and recovery device enables the heat exchange efficiency of the regenerative rotating bed adsorption and recovery device to be as high as 95%, and the overall energy consumption of the regenerative rotating bed adsorption and recovery device is saved by 55%. According to the process requirements designed according to the waste gas concentration, multiple cycle processes are carried out until the industry waste gas emission standard is reached. Moreover, this regenerative rotating bed adsorption and recovery device can adjust the areas of the adsorption zone 22, the desorption zone 23, and the cooling zone 24 according to the different waste gas components and concentrations, and set multiple desorption zones 23 and cooling zones 24, so as to achieve the purpose of adjusting the desorption concentration multiple and the cooling temperature.

[0084] In summary, the present application provides a regenerative rotating bed adsorption recovery device and method. Compared with the existing fixed bed adsorption recovery process, the adsorption rotor can operate continuously in rotation, ensuring the stable outlet concentration of the adsorption zone 22, ensuring that the purification efficiency is above 95%, ensuring compliance with the designed industry emission standards, reducing the desorption time from more than 2 hours to 10 - 30 minutes, and greatly shortening the operation time. This regenerative rotating bed adsorption recovery device has the performance of regenerative heat exchange. The desorption zone 23 and the cooling zone 24 can achieve efficient heat exchange, realizing the exchange of low-temperature and high-temperature heat through continuous rotation, reducing the adsorption of waste gas in the cooling zone 24, and ensuring the high efficiency of cooling regeneration. The thermal utilization rate of the regenerative rotating bed adsorption recovery device is improved, with the heat exchange efficiency being as high as more than 90%, and the overall energy consumption of the regenerative rotating bed adsorption recovery device is saved by more than 50%. An oxygen content concentration detector that selects one of two is adopted to supplement nitrogen in real time according to the change of oxygen concentration, strictly controlling the oxygen content to ensure the safety and stability of the high regenerative rotating bed adsorption recovery device. This regenerative rotating bed adsorption recovery device has a simple structure and can meet the requirement that the outlet concentration after adsorption reaches <50 mg / m 3 of the emission standard. This regenerative rotating bed adsorption recovery device has a small floor area, a compact structure, and a low operating cost.

[0085] The above are only the preferred embodiments of the present application and do not impose any form of limitation on the present application. Although the present application has been disclosed above with the preferred embodiments, it is not intended to limit the present application. Any person skilled in the art of this patent, without departing from the scope of the technical solution of the present application, may make some changes or modifications using the technical content prompted above into equivalent embodiments with equivalent changes. However, as long as it does not depart from the content of the technical solution of the present application, any simple modification, equivalent change, and modification made to the above embodiments according to the technical essence of the present application still fall within the scope of the present application.

Claims

1. A regenerative rotary bed adsorption recovery device, characterized in that: Comprising: An adsorption wheel, which includes an adsorption zone, a desorption zone, and a cooling zone; An exhaust gas inlet system, the outlet of which is communicated with the inlet of the adsorption zone; An exhaust gas outlet system, the outlet of the adsorption zone is communicated with the inlet of the exhaust gas outlet system; A condensation system, the outlet of the desorption zone is communicated with the inlet of the condensation system, and the outlet of the condensation system is communicated with the inlet of the cooling zone; A heating system, the outlet of the cooling zone is communicated with the inlet of the heating system, and the outlet of the heating system is communicated with the inlet of the desorption zone.

2. The regenerative rotary bed adsorption recovery device according to claim 1, wherein: The adsorption wheel is filled with heat storage material.

3. The regenerative rotary bed adsorption recovery device according to claim 1, wherein: It further comprises: A nitrogen supply pipeline, the outlet of which is communicated with the condensation system; A purge exhaust gas pipeline, the inlet of which is communicated with the heating system, and the outlet of which is communicated with the exhaust gas inlet system.

4. The regenerative rotary bed adsorption recovery device according to claim 3, characterized in that: The exhaust gas inlet system includes an exhaust gas inlet pipeline. Along the gas flow direction, a temperature and humidity adjustment device, a filter, an adsorption fan, and a first control valve are sequentially arranged on the exhaust gas inlet pipeline. The outlet of the exhaust gas inlet pipeline is communicated with the inlet of the adsorption zone.

5. The regenerative rotary bed adsorption recovery device according to claim 1, characterized in that: The exhaust gas outlet system includes an exhaust gas outlet pipeline. The outlet of the adsorption zone is communicated with the inlet of the exhaust gas outlet pipeline, and a second control valve is arranged on the exhaust gas outlet pipeline.

6. The regenerative rotary bed adsorption recovery device according to claim 3, characterized in that: The condensation system includes a condensation pipeline. The outlet of the desorption zone is communicated with the inlet of the condensation pipeline, and the outlet of the condensation pipeline is communicated with the inlet of the cooling zone. Along the gas flow direction, a desorption fan, a third control valve, an oxygen concentration detection unit, a condenser, a gas-liquid separator, and a fourth control valve are sequentially arranged on the condensation pipeline. The gas-liquid separator is communicated with a waste liquid storage tank.

7. The regenerative rotary bed adsorption recovery device according to claim 6, characterized in that: A sixth control valve is arranged on the nitrogen supply pipeline, and the outlet of the nitrogen supply pipeline is communicated with the condensation pipeline between the inlet of the condensation pipeline and the desorption fan.

8. The regenerative rotary bed adsorption recovery device according to claim 4, characterized in that: The heating system includes a heating pipeline. The outlet of the cooling zone is communicated with the inlet of the heating pipeline, and the outlet of the heating pipeline is communicated with the inlet of the desorption zone. A heater is arranged on the heating pipeline.

9. The regenerative rotary bed adsorption recovery device according to claim 8, wherein: A fifth control valve is arranged on the purge exhaust gas pipeline. The inlet of the purge exhaust gas pipeline is communicated with the heating pipeline between the inlet of the heating pipeline and the heater, and the outlet of the purge exhaust gas pipeline is communicated with the exhaust gas inlet pipeline between the temperature and humidity adjustment device and the filter.

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