Composite heat storage rotating bed molecular sieve rotating wheel adsorption recovery device

Abstract

The utility model provides a combined type heat storage rotating bed molecular sieve rotating wheel adsorption recovery device, desorption gas discharged from a first desorption area of the device is cooled and then enters a second adsorption area to be adsorbed, and adsorbed cooling gas discharged from the second adsorption area respectively enters a first cooling area and a second cooling area to be purged and cooled. The cooling gas entering the first cooling area and the second cooling area is effectively prevented from being easily adsorbed in the first cooling area and the second cooling area due to high waste gas concentration, the effective cooling regeneration area of the first cooling area and the second cooling area is increased, and the regeneration efficiency of the first cooling area and the second cooling area is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of waste gas treatment, and particularly relates to a composite heat storage rotary bed molecular sieve wheel adsorption and recovery device. Background Art

[0002] In recent years, the treatment of volatile organic compounds (VOCs) waste gas has always been the focus of attention of the government, enterprises and the public. VOCs have a wide range of sources, covering many industries such as fine chemical industry, electronic manufacturing, petroleum refining, industrial painting, packaging and printing, etc. They have a wide variety of types and different characteristics, which brings challenges to treatment. China has put forward higher requirements for the prevention and control of VOCs, aiming to achieve a comprehensive prevention and control strategy combining source reduction, process control and end treatment. At present, the main VOCs waste gas treatment technologies include condensation method, absorption method, adsorption method, biological method, high-temperature oxidation method, low-temperature plasma method, etc. Among them, the adsorption + catalytic oxidation method is widely used because of its high maturity, but there are also problems such as poor carbon reduction effect, low safety factor, high operation cost, etc., and combustion treatment will cause a large amount of waste of resources. Therefore, a fixed bed adsorption and recovery process has emerged on the market to solve this problem, but this process has a long desorption time, increases the operation cycle, especially at a lower concentration, the utilization rate of the fixed bed is low and the investment is large. Therefore, the development of a rotary continuous operation adsorption and recovery device is particularly important. For a rotary wheel recovery device, when treating medium and high concentration VOCs waste gas, when the saturated vapor pressure of the treated substance is relatively large, the waste gas concentration in the cooling zone is relatively high and is easily adsorbed in the cooling zone, reducing the effective cooling and regeneration area of the cooling zone and affecting the cooling and regeneration efficiency of the rotary molecular sieve wheel. And when meeting the VOCs waste gas emission standard, it further leads to an increase in the process design cost and burdens the enterprise.

[0003] In view of this, the present utility model is specifically proposed. Summary of the Utility Model

[0004] The purpose of the present utility model is to provide a composite heat storage rotary bed molecular sieve wheel adsorption and recovery device to solve the above problems.

[0005] To achieve the above purpose, the present utility model specifically adopts the following technical solutions:

[0006] A composite heat storage rotary bed molecular sieve wheel adsorption and recovery device, comprising:

[0007] A first adsorption wheel, the first adsorption wheel comprising a first adsorption zone, a first desorption zone and a first cooling zone;

[0008] A second adsorption wheel, the second adsorption wheel comprising a second adsorption zone, a second desorption zone and a second cooling zone;

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

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

[0011] A condensation system, the outlet of the first desorption zone is communicated with the inlet of the condensation system, the outlet of the condensation system is communicated with the inlet of the second adsorption zone, the outlet of the second adsorption zone is respectively communicated with the exhaust gas inlet system, the inlet of the first cooling zone, and the inlet of the second cooling zone, and the outlet of the second desorption zone is communicated with the condensation system;

[0012] A heating system, the outlet of the first cooling zone is communicated with the inlet of the heating system, the outlet of the second cooling zone is communicated with the inlet of the heating system, and the outlet of the heating system is respectively communicated with the inlet of the first desorption zone and the inlet of the second desorption zone.

[0013] In some alternative embodiments: the first adsorption rotor is filled with heat storage material and / or the second adsorption rotor is filled with heat storage material.

[0014] In some alternative embodiments: further includes a nitrogen supply pipeline, the outlet of which is communicated with the heating system.

[0015] In some alternative embodiments: the condensation system includes a condensation pipeline, the outlet of the first desorption zone is communicated with the inlet of the condensation pipeline, the outlet of the condensation pipeline is communicated with the inlet of the second adsorption zone, along the gas flow direction, a first desorption fan, a fourth control valve, a condenser, an oxygen concentration detection unit, and a gas-liquid separator are sequentially arranged on the condensation pipeline, and the gas-liquid separator is communicated with a waste liquid storage tank through an eighth control valve.

[0016] Further: the outlet of the second desorption zone is sequentially communicated with the condensation pipeline between the fourth control valve and the condenser through a second desorption fan and a ninth control valve.

[0017] In some alternative embodiments: the heating system includes a heating pipeline, the outlet of the first cooling zone is communicated with the inlet of the heating pipeline, the outlet of the second cooling zone is communicated with the inlet of the heating pipeline, the outlet of the heating pipeline is respectively communicated with the inlet of the first desorption zone and the inlet of the second desorption zone, and a heater is arranged on the heating pipeline.

[0018] Further: the outlet of the heater is communicated with the inlet of the first desorption zone through a fifth control valve;

[0019] The outlet of the heater is communicated with the inlet of the second desorption zone through an eleventh control valve.

[0020] In some alternative embodiments: 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 first adsorption zone.

[0021] Furthermore:

[0022] The outlet of the second adsorption zone is communicated with the inlet of the second cooling zone through a tenth control valve;

[0023] The outlet of the second adsorption zone is communicated with the inlet of the first cooling zone through a third control valve;

[0024] The outlet of the second adsorption zone is communicated with the exhaust gas inlet pipeline between the filter and the adsorption fan through a seventh control valve.

[0025] The present application also provides a composite heat storage rotary bed molecular sieve rotor adsorption and recovery method based on the above-mentioned device. The desorption gas discharged from the first desorption zone enters the second adsorption zone for adsorption after being cooled. The cooled gas after adsorption discharged from the second adsorption zone enters the first cooling zone and the second cooling zone respectively for purging and cooling. The cooled gas discharged from the first cooling zone and the second cooling zone adsorbs heat and then purges and desorbs the first desorption zone and the second desorption zone.

[0026] Advantages of the present utility model:

[0027] A composite heat storage rotary bed molecular sieve rotor adsorption and recovery device and method provided by the present utility model. The desorption gas discharged from the first desorption zone of the device enters the second adsorption zone for adsorption after being cooled. The cooled gas after adsorption discharged from the second adsorption zone enters the first cooling zone and the second cooling zone respectively for purging and cooling. It effectively prevents the cooled gas entering the first cooling zone and the second cooling zone from being easily adsorbed in the first cooling zone and the second cooling zone due to the high exhaust gas concentration, increases the effective cooling and regeneration area of the first cooling zone and the second cooling zone, and improves the regeneration efficiency of the first cooling zone and the second cooling zone. Description of the Drawings

[0028] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0029] Figure 1Schematic structural diagram of a composite heat storage rotary bed molecular sieve rotor adsorption and recovery device provided by this application.

[0030] In the figure: 1, waste gas inlet pipeline; 2, temperature and humidity adjustment device; 3, filter; 4, adsorption fan; 5, first control valve; 6, second control valve; 7, waste gas outlet pipeline; 8, first adsorption zone; 9, first cooling zone; 10, first desorption zone; 11, fifth control valve; 12, heating pipeline; 13, heater; 14, nitrogen supply pipeline; 15, sixth control valve; 16, third control valve; 17, first desorption fan; 18, seventh control valve; 19, fourth control valve; 20, condensation pipeline; 21, condenser; 22, oxygen concentration detection unit; 23, gas-liquid separator; 24, eighth control valve; 25, waste liquid storage tank; 26, eleventh control valve; 27, second adsorption zone; 28, second cooling zone; 29, second desorption zone; 30, second desorption fan; 31, tenth control valve; 32, ninth control valve. Detailed implementation manners

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0032] As Figure 1 shown, the present utility model provides a composite heat storage rotary bed molecular sieve rotor adsorption and recovery device, and the composite heat storage rotary bed molecular sieve rotor adsorption and recovery device includes:

[0033] A first adsorption rotor, the first adsorption rotor includes a first adsorption zone 8, a first desorption zone 10, and a first cooling zone 9;

[0034] A second adsorption rotor, the second adsorption rotor includes a second adsorption zone 27, a second desorption zone 29, and a second cooling zone 28;

[0035] A waste gas inlet system, and the outlet of the waste gas inlet system is communicated with the inlet of the first adsorption zone 8;

[0036] A waste gas outlet system, and the outlet of the first adsorption zone 8 is communicated with the inlet of the waste gas outlet system;

[0037] Condensation system, the outlet of the first desorption zone 10 is communicated with the inlet of the condensation system, the outlet of the condensation system is communicated with the inlet of the second adsorption zone 27, the outlet of the second adsorption zone 27 is respectively communicated with the waste gas inlet system, the inlet of the first cooling zone 9, and the inlet of the second cooling zone 28, and the outlet of the second desorption zone 29 is communicated with the condensation system;

[0038] Heating system, the outlet of the first cooling zone 9 is communicated with the inlet of the heating system, the outlet of the second cooling zone 28 is communicated with the inlet of the heating system, and the outlet of the heating system is respectively communicated with the inlet of the first desorption zone 10 and the inlet of the second desorption zone 29.

[0039] Specifically:

[0040] The first adsorption wheel includes a first adsorption zone 8, a first desorption zone 10, and a first cooling zone 9;

[0041] The second adsorption wheel includes a second adsorption zone 27, a second desorption zone 29, and a second cooling zone 28;

[0042] The waste gas first enters the waste gas inlet system. After being pretreated by the waste gas inlet system, it passes through the outlet of the waste gas inlet system, then enters the first adsorption zone 8 of the first adsorption wheel through the inlet of the first adsorption zone 8. The first adsorption zone 8 adsorbs VOCs in the waste gas. The waste gas reaches the emission standard and passes through the outlet of the first adsorption zone 8, then passes through the inlet of the waste gas outlet system and is discharged to the atmosphere from the outlet of the waste gas outlet system.

[0043] The first adsorption zone 8 of the first adsorption wheel that has adsorbed VOCs continuously rotates into the first desorption zone 10. When the first adsorption zone 8 rotates to the first desorption zone 10, nitrogen is introduced into the nitrogen supply pipeline 14. The nitrogen passes through the outlet of the nitrogen supply pipeline 14 and enters the heating system to purge the entire composite heat storage rotary bed molecular sieve wheel adsorption recovery device with nitrogen, and the gas containing oxygen and VOCs is displaced. When the oxygen concentration reaches the target safety value, the nitrogen protection is closed.

[0044] The VOCs adsorbed on the first adsorption wheel are desorbed by the high-temperature desorption gas. The desorbed VOCs are carried away from the first desorption zone 10 by the high-temperature desorption gas, pass through the outlet of the first desorption zone 10, and then enter the condensation system through the inlet of the condensation system. The condensation system cools the incoming desorption gas. The condensed waste liquid containing VOCs is discharged from the condensation system, and the cooled gas after condensation passes through the outlet of the condensation system and the inlet of the second adsorption zone 27 to enter the second adsorption zone 27 for adsorption. Since the outlet of the second adsorption zone 27 is respectively communicated with the inlet of the first cooling zone 9 and the inlet of the second cooling zone 28, the adsorbed and cooled gas discharged from the second adsorption zone 27 respectively enters the first cooling zone 9 and the second cooling zone 28 for purging and cooling to cool and regenerate the first adsorption wheel and the second adsorption wheel.

[0045] The cooling gas at the outlets of the first cooling zone 9 and the second cooling zone 28 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 and then enters the inlets of the first desorption zone 10 and the second desorption zone 29 respectively through the inlets of the first desorption zone 10 and the second desorption zone 29 to perform high-temperature desorption gas desorption in the first desorption zone 10 and the second desorption zone 29. And so on in a cycle. The desorption gas discharged from the first desorption zone 10 of the device enters the second adsorption zone 27 for adsorption after cooling. The cooled gas after adsorption discharged from the second adsorption zone 27 enters the first cooling zone 9 and the second cooling zone 28 respectively for purging and cooling. It effectively prevents the cooling gas entering the first cooling zone 9 and the second cooling zone 28 from being easily adsorbed in the first cooling zone 9 and the second cooling zone 28 due to the high waste gas concentration, increases the effective cooling and regeneration area of the first cooling zone 9 and the second cooling zone 28, and improves the regeneration efficiency of the first cooling zone 9 and the second cooling zone 28.

[0046] As Figure 1 shown, in some alternative embodiments, the present utility model provides a composite regenerative rotary bed molecular sieve wheel adsorption and recovery device. The waste gas inlet system 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 first adsorption zone 8.

[0047] The waste gas is medium- and high-concentration waste gas from 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 35-40 °C, and then enters the filter 3 to remove the particulate matter existing in the waste gas. The filtered waste gas is provided with gas flow power by the adsorption fan 4. 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 first adsorption zone 8 of the first adsorption wheel to enter the first adsorption zone 8 of the first adsorption wheel for adsorption treatment of the waste gas. The first control valve 5 can control the on-off of the waste gas inlet pipeline 1 and control the gas flow rate of the waste gas entering the first adsorption zone 8.

[0048] The waste gas outlet system includes a waste gas outlet pipeline 7. The outlet of the first adsorption zone 8 is communicated with the inlet of the waste gas outlet pipeline 7, and a second control valve 6 is arranged on the waste gas outlet pipeline 7.

[0049] When the first adsorption zone 8 adsorbs VOCs in the waste gas, the concentration of VOCs in the adsorbed waste gas < 50 mg / m 3, The exhaust gas reaches the emission standard and passes through the outlet of the first adsorption zone 8, enters the exhaust gas outlet pipeline 7 through the inlet of the exhaust gas outlet pipeline 7, and is then discharged into the atmosphere through the outlet of the exhaust gas outlet pipeline 7. A second control valve 6 is provided on the exhaust gas outlet pipeline 7. The second control valve 6 can control the on-off of the exhaust gas outlet pipeline 7 and control the air flow rate of the purified exhaust gas discharged into the atmosphere.

[0050] When the first adsorption zone 8 reaches adsorption saturation, the first adsorption rotor rotates into the first desorption zone 10. First, nitrogen is introduced. The nitrogen enters the nitrogen supply pipeline 14 through the inlet of the nitrogen supply pipeline 14, and then enters the heating system through the outlet of the nitrogen supply pipeline 14. A sixth control valve 15 is provided on the nitrogen supply pipeline 14, and the sixth control valve 15 controls the on-off and air flow rate of the nitrogen supply pipeline 14.

[0051] The nitrogen is purged in the condensation system, heating system, first adsorption rotor, and second adsorption rotor. The entire composite regenerative rotating bed molecular sieve rotor adsorption recovery device is purged with nitrogen, and the gas containing oxygen and VOCs is displaced. Since the outlet of the second adsorption zone 27 is connected to the exhaust gas inlet pipeline 1 between the filter 3 and the adsorption fan 4 through the seventh control valve 18. The seventh control valve 18 controls the on-off and air flow rate of the nitrogen entering the exhaust gas inlet pipeline 1.

[0052] The purging exhaust gas enters the exhaust gas inlet pipeline 1, and then enters the first adsorption zone 8 of the first adsorption rotor through the inlet of the first adsorption zone 8. The first adsorption zone 8 adsorbs the VOCs in the purging exhaust gas, and the concentration of VOCs in the purged exhaust gas after adsorption < 50mg / m 3 , The purging exhaust gas reaches the emission standard and enters the exhaust gas outlet pipeline 7 through the outlet of the first adsorption zone 8, and is then discharged into the atmosphere through the outlet of the exhaust gas outlet pipeline 7.

[0053] The above structure can not only purge the composite regenerative rotating bed molecular sieve rotor adsorption recovery device with nitrogen, reduce the oxygen concentration in the composite regenerative rotating bed molecular sieve rotor adsorption recovery device, and ensure the safe operation of the composite regenerative rotating bed molecular sieve rotor adsorption recovery device, but also perform adsorption treatment of the purging exhaust gas in the first adsorption zone 8, and discharge it into the atmosphere through the outlet of the exhaust gas outlet system after reaching the emission standard, which is safe and environmentally friendly.

[0054] The condensation system includes a condensation pipeline 20. The outlet of the first desorption zone 10 is communicated with the inlet of the condensation pipeline 20, and the outlet of the condensation pipeline 20 is communicated with the inlet of the second adsorption zone 27. Along the air flow direction, a first desorption fan 17, a fourth control valve 19, a condenser 21, an oxygen concentration detection unit 22, and a gas-liquid separator 23 are sequentially arranged on the condensation pipeline 20. The gas-liquid separator 23 is communicated with a waste liquid storage tank 25 through an eighth control valve 24. The fourth control valve 19 is used to control the on-off and air flow rate of the condensation pipeline 20, and the eighth control valve 24 is used to control the on-off and waste liquid flow rate of the waste liquid entering the waste liquid storage tank 25.

[0055] The oxygen concentration detection unit 22 is an oxygen concentration detector, which is used to monitor the oxygen concentration in the composite regenerative rotary bed molecular sieve rotor adsorption and 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%.

[0056] 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 composite regenerative rotary bed molecular sieve rotor adsorption and recovery device.

[0057] Optionally, two oxygen concentration detectors are set. 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 composite regenerative rotary bed molecular sieve rotor adsorption and recovery device.

[0058] After the nitrogen protection is turned off, the VOCs adsorbed on the first adsorption rotor are desorbed by the high-temperature desorption gas. The desorbed VOCs are carried away from the first desorption zone 10 by the 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.

[0059] Optionally, the first adsorption rotor is filled with a heat storage material and / or the second adsorption rotor is filled with a heat storage material.

[0060] Both the first adsorption rotor and the second adsorption rotor can be filled with a heat storage material, or only one of them is filled with a heat storage material. In this embodiment, the case where both the first adsorption rotor and the second adsorption rotor are filled with a heat storage material is taken as an example for illustration.

[0061] The heat storage material in the first desorption zone 10 absorbs and stores the heat released during the desorption process. Then the first adsorption rotor rotates from the first desorption zone 10 into the first cooling zone 9.

[0062] The heat storage material in the second desorption zone 29 absorbs and stores the heat released during the desorption process. Then the second adsorption rotor rotates from the second desorption zone 29 into the second cooling zone 28.

[0063] After desorption, the VOCs are carried away from the first desorption zone 10 by the high-temperature desorption gas, pass through the outlet of the first desorption zone 10, and then enter the condensation pipeline 20 through the inlet of the condensation pipeline 20. The desorption gas at the outlet of the first desorption zone 10 contains a large amount of VOCs and a small amount of moisture, and the air flow power is provided by the first desorption fan 17, and it passes through the fourth control valve 19, the condenser 21, the oxygen concentration detection unit 22 in sequence, and enters the gas-liquid separator 23. The fourth control valve 19 can control the on-off of the condensation pipeline 20 and control the air flow rate entering the condenser 21 in the condensation pipeline 20.

[0064] The condenser 21 uses circulating water for condensation, and the outlet temperature of the condenser 21 is 10 - 20 °C. The desorption gas after condensation becomes a cooling gas and enters the gas-liquid separator 23 for gas-liquid separation operation. The gas-liquid separator 23 is connected to the waste liquid storage tank 25 through the eighth control valve 24. The condensed waste liquid is discharged into the waste liquid storage tank 25. The eighth control valve 24 can control the on-off and flow rate of the condensed waste liquid discharged into the waste liquid storage tank 25.

[0065] The cooled gas after condensation enters the second adsorption zone 27 through the outlet of the condensation system and the inlet of the second adsorption zone 27 for adsorption. After passing through the adsorption zone of the second adsorption zone 27, the concentration of the waste gas of the cooled gas after adsorption discharged from the second adsorption zone 27 is 1 - 10 g / m 3 .

[0066] The outlet of the second adsorption zone 27 is connected to the inlet of the second cooling zone 28 through the tenth control valve 31;

[0067] The outlet of the second adsorption zone 27 is connected to the inlet of the first cooling zone 9 through the third control valve 16;

[0068] The cooled gas after adsorption discharged from the second adsorption zone 27 enters the second cooling zone 28 through the tenth control valve 31 and the inlet of the second cooling zone 28 for cooling regeneration. The tenth control valve 31 controls the on-off and flow rate of the cooling gas entering the second cooling zone 28.

[0069] The heat stored in the heat storage material in the second cooling zone 28 is released. After the cooling gas in the second cooling zone 28 absorbs heat, the temperature of the cooling gas at the outlet of the second cooling zone 28 rises to 100 - 180 °C.

[0070] The cooled gas after adsorption discharged from the second adsorption zone 27 enters the first cooling zone 9 through the third control valve 16 and the inlet of the first cooling zone 9 for cooling regeneration. The third control valve 16 controls the on-off and flow rate of the cooling gas entering the first cooling zone 9.

[0071] The heat stored in the heat storage material in the first cooling zone 9 is released. After the cooling gas in the first cooling zone 9 absorbs heat, the temperature of the cooling gas at the outlet of the first cooling zone 9 rises to 100 - 180 °C.

[0072] To improve the desorption efficiency, the heating system includes a heating pipeline 12. The outlet of the first cooling zone 9 is communicated with the inlet of the heating pipeline 12, and the outlet of the second cooling zone 28 is communicated with the inlet of the heating pipeline 12. The outlet of the heating pipeline 12 is respectively communicated with the inlet of the first desorption zone 10 and the inlet of the second desorption zone 29. A heater 13 is provided on the heating pipeline 12.

[0073] The temperature - raised cooling gas discharged from the outlets of the first cooling zone 9 and the second cooling zone 28 is heated by the heater 13 to generate high - temperature desorption gas, and the high - temperature desorption gas is heated to 200 °C.

[0074] The outlet of the heater 13 is communicated with the inlet of the first desorption zone 10 through the fifth control valve 11.

[0075] The outlet of the heater 13 is communicated with the inlet of the second desorption zone 29 through the eleventh control valve 26.

[0076] The high - temperature desorption gas generated after being heated by the heater 13 enters the first desorption zone 10 through the outlet of the heater 13, the fifth control valve 11, and the inlet of the first desorption zone 10 to perform purge desorption on the first desorption zone 10. The fifth control valve 11 controls the on - off and flow rate of the high - temperature desorption gas entering the first desorption zone 10.

[0077] The high - temperature desorption gas generated after being heated by the heater 13 enters the second desorption zone 29 through the outlet of the heater 13, the eleventh control valve 26, and the inlet of the second desorption zone 29 to perform purge desorption on the second desorption zone 29. The eleventh control valve 26 controls the on - off and flow rate of the high - temperature desorption gas entering the second desorption zone 29.

[0078] The outlet of the second desorption zone 29 is successively communicated with the condensation pipeline 20 between the fourth control valve 19 and the condenser 21 through the second desorption fan 30 and the ninth control valve 32.

[0079] The desorbed VOCs discharged from the second desorption zone 29 are carried away by the high - temperature desorption gas and leave the second desorption zone 29. Through the outlet of the second desorption zone 29, the ninth control valve 32, they enter the condensation pipeline 20 between the fourth control valve 19 and the condenser 21, then pass through the condenser 21, the oxygen concentration detection unit 22, and enter the gas - liquid separator 23. This cycle can effectively utilize the energy consumption in the desorption process, has a higher heat utilization efficiency, has obvious energy - saving advantages, and at the same time has lower equipment investment.

[0080] The first adsorption rotor and the second adsorption rotor are filled with heat storage materials. Filling heat storage materials in the first adsorption rotor and the second adsorption rotor can better absorb and store the heat released during the desorption process, which can make the cooling gas temperature at the outlet of the first cooling zone 9 and the outlet of the second cooling zone 28 rise higher. In this way, the consumption of the heating system for heating can be reduced, with higher heat utilization efficiency and obvious energy-saving advantages. Through continuous rotation, the exchange of low-temperature and high-temperature heat is realized, the temperatures of the first cooling zone 9 and the second cooling zone 28 are reduced, the adsorption of waste gas in the first cooling zone 9 and the second cooling zone 28 is reduced, the cooling efficiency is improved, and at the same time, heat is provided for the first desorption zone 10 and the second desorption zone 29, further improving the desorption efficiency, so that the heat utilization efficiency of the composite heat storage rotary bed molecular sieve rotor adsorption recovery device reaches more than 90%, and the overall energy consumption is saved by more than 50%.

[0081] When performing multiple cycle processes to meet the exhaust gas emission standards, according to the different components and concentrations of the exhaust gas, the areas of the first adsorption zone 8, the first desorption zone 10 and the first cooling zone 9 can be adjusted, and multiple sections of the first desorption zone 10 and the first cooling zone 9 can be set, so as to achieve the purpose of adjusting the desorption concentration multiple and the cooling temperature.

[0082] Adjust the areas of the second adsorption zone 27, the second desorption zone 29 and the second cooling zone 28, and set multiple sections of the second desorption zone 29 and the second cooling zone 28, so as to achieve the purpose of adjusting the desorption concentration multiple and the cooling temperature.

[0083] It should be noted that the emission standards mentioned in this application are industry standards.

[0084] When the first adsorption rotor mentioned in this application works, it rotates continuously in the order of the first adsorption zone 8, the first desorption zone 10, and the first cooling zone 9.

[0085] When the second adsorption rotor mentioned in this application works, it rotates continuously in the order of the second adsorption zone 27, the second desorption zone 29, and the second cooling zone 28.

[0086] The heat storage materials mentioned in this application mainly consist of heat storage materials such as Al2O3, SiC, SiO2, etc., or materials with high adsorption efficiency and heat storage performance, or a combination of multiple heat storage materials.

[0087] This application also provides a composite heat storage rotary bed molecular sieve rotor adsorption recovery method, which is realized based on any one of the above composite heat storage rotary bed molecular sieve rotor adsorption recovery devices.

[0088] The desorbed gas discharged from the first desorption zone 10 is cooled and then enters the second adsorption zone 27 for adsorption. The cooled gas after adsorption discharged from the second adsorption zone 27 enters the first cooling zone 9 and the second cooling zone 28 respectively for purging and cooling. The cooled gas discharged from the first cooling zone 9 and the second cooling zone 28 absorbs heat and then purges and desorbs the first desorption zone 10 and the second desorption zone 29.

[0089] The desorbed gas discharged from the first desorption zone 10 of the method is cooled and then enters the second adsorption zone 27 for adsorption. The cooled gas after adsorption discharged from the second adsorption zone 27 enters the first cooling zone 9 and the second cooling zone 28 respectively for purging and cooling. It effectively prevents the cooled gas entering the first cooling zone 9 and the second cooling zone 28 from being easily adsorbed in the first cooling zone 9 and the second cooling zone 28 due to the high waste gas concentration, increases the effective cooling and regeneration area of the first cooling zone 9 and the second cooling zone 28, and improves the regeneration efficiency of the first cooling zone 9 and the second cooling zone 28.

[0090] Such as Figure 1 As shown, the present application provides a composite regenerative rotating bed molecular sieve wheel adsorption and recovery device and method, which will be explained below with a specific embodiment.

[0091] For the coating waste gas in a coating workshop, the exhaust air volume is 50000 N m 3 / h air volume, the solvent components are xylene and butyl acetate, the total waste gas concentration is 3000 mg / m 3 , the waste gas discharge temperature is 60 °C, the relative humidity is 20%, and it is required that the waste gas discharge concentration after treatment < 25 mg / m 3 . An on-line monitoring system is set at the outlet of the first adsorption zone 8 to detect the chimney discharge concentration in real time. When the discharge concentration reaches the design target, the tail gas is discharged into the atmosphere from the outlet of the waste gas outlet system.

[0092] The waste gas first enters the waste gas inlet system. After the waste gas is pretreated by the waste gas inlet system, it passes through the outlet of the waste gas inlet system, and then enters the first adsorption zone 8 of the first adsorption wheel through the inlet of the first adsorption zone 8. The first adsorption zone 8 adsorbs VOCs in the waste gas. When the waste gas reaches the emission standard, it passes through the outlet of the first adsorption zone 8, and then enters the inlet of the waste gas outlet system and is discharged to the atmosphere from the outlet of the waste gas outlet system.

[0093] When the first adsorption zone 8 reaches saturation, the first adsorption zone 8 of the first adsorption wheel adsorbing VOCs continuously rotates into the first desorption zone 10. Before the first adsorption zone 8 rotates to the first desorption zone 10 for desorption. First, nitrogen protection is carried out on the composite regenerative rotating bed molecular sieve wheel adsorption and recovery device, and nitrogen purging is carried out on the entire composite regenerative rotating bed molecular sieve wheel adsorption and recovery device to displace the gas containing oxygen and VOCs. When the oxygen content < 5%, the nitrogen protection is closed and the nitrogen filling is stopped.

[0094] During the desorption process in the first desorption zone 10 of the first adsorption rotor, the desorption air velocity is 5000 Nm 3 / h, and the outlet concentration of the first desorption zone 10 is 60 g / m 3 . Then it enters the condenser 21, where circulating water is used for condensation, and the condensation temperature is 10°C. The outlet cooling gas of the condenser 21 enters the gas-liquid separator 23 for gas-liquid separation operation, and the condensed waste liquid enters the waste liquid storage tank 25.

[0095] The concentration of the waste gas after condensation is 30 g / m 3 . Since the high-concentration workshop waste gas directly entering the first cooling zone 9 will be adsorbed in the first cooling zone 9, reducing the cooling efficiency, to reduce the adsorption of waste gas in the first cooling zone 9 and ensure the high efficiency of cooling regeneration, the cooling gas enters the second adsorption zone 27 of the second adsorption rotor for secondary adsorption, and the outlet concentration of the second adsorption zone 27 is 1 g / m 3 . They respectively enter the first cooling zone 9 and the second cooling zone 28 for purging and cooling. The first cooling zone 9 and the second cooling zone 28 perform cooling regeneration.

[0096] Both the first adsorption rotor and the second adsorption rotor of the composite regenerative rotating bed molecular sieve rotor adsorption and recovery device can be filled with regenerative materials, and both the first adsorption rotor and the second adsorption rotor have the function of regenerative heat exchange.

[0097] Efficient heat exchange can be achieved between the first desorption zone 10 and the first cooling zone 9 inside the first adsorption rotor. Through continuous rotation, the exchange of low-temperature and high-temperature heat is realized, reducing the temperature of the first cooling zone 9, reducing the adsorption of waste gas in the first cooling zone 9, improving the cooling efficiency, and at the same time providing heat for the first desorption zone 10 to further improve the desorption efficiency. After heat exchange, the temperature of the cooling gas at the outlet of the first cooling zone 9 reaches 160°C and then enters the heater 13 to be heated to 200°C.

[0098] Efficient heat exchange can be achieved between the second desorption zone 29 and the second cooling zone 28 inside the second adsorption rotor. Through continuous rotation, the exchange of low-temperature and high-temperature heat is realized, reducing the temperature of the second cooling zone 28, reducing the adsorption of waste gas in the second cooling zone 28, improving the cooling efficiency, and at the same time providing heat for the second desorption zone 29 to further improve the desorption efficiency. After heat exchange, the temperature of the cooling gas at the outlet of the second cooling zone 28 reaches 160°C and then enters the heater 13 to be heated to 200°C.

[0099] After being heated by the heater 13, high-temperature desorption gas at 200°C is generated. It enters the first desorption zone 10 through the outlet of the heater 13, the fifth control valve 11, and the inlet of the first desorption zone 10 to perform purge desorption on the first desorption zone 10.

[0100] After being heated by the heater 13, high-temperature desorption gas at 200 °C is generated and enters the second desorption zone 29 through the outlet of the heater 13, the eleventh control valve 26, and the inlet of the second desorption zone 29 to perform purge desorption on the second desorption zone 29.

[0101] The desorption time of the first desorption zone 10 and the second desorption zone 29 is shortened to 30 min.

[0102] The heat storage and heat exchange functions of the first adsorption rotor and the second adsorption rotor enable the heat exchange efficiency of the composite heat storage rotary bed molecular sieve rotor adsorption and recovery device to be as high as 92%, and the overall energy consumption of the composite heat storage rotary bed molecular sieve rotor adsorption and recovery device is saved by 50%. According to the process requirements designed based on the waste gas concentration, multiple cycle processes are carried out until the waste gas discharge standard is reached.

[0103] In summary, compared with the existing fixed bed molecular sieve rotor adsorption and recovery process, the composite heat storage rotary bed molecular sieve rotor adsorption and recovery device can operate continuously in rotation, ensure the stable outlet concentration of the first adsorption zone 8, ensure that the purification efficiency is above 95%, and ensure that the designed discharge standard is met.

[0104] Compared with the existing fixed bed molecular sieve rotor adsorption and recovery process, the desorption time of the composite heat storage rotary bed molecular sieve rotor adsorption and recovery device is reduced from more than 2 h to less than 30 min, greatly shortening the operation time.

[0105] The composite heat storage rotary bed molecular sieve rotor adsorption and recovery device increases secondary adsorption to reduce the micro adsorption of waste gas or even avoid adsorption in the first cooling zone 9, ensuring the cooling and regeneration efficiency of the first cooling zone 9.

[0106] The heat storage and heat exchange functions of the first adsorption rotor and the second adsorption rotor of the composite heat storage rotary bed molecular sieve rotor adsorption and recovery device enable the heat exchange efficiency of the composite heat storage rotary bed molecular sieve rotor adsorption and recovery device to be as high as 92%, and the overall energy consumption of the composite heat storage rotary bed molecular sieve rotor adsorption and recovery device is saved by more than 50%.

[0107] The composite heat storage rotary bed molecular sieve rotor adsorption and recovery device can adjust the areas of the first adsorption zone 8, the first desorption zone 10, and the first cooling zone 9 according to the different waste gases and components to be treated, and can also set multiple sections of the first desorption zone 10 and the first cooling zone 9, so as to achieve the purpose of adjusting the desorption concentration multiple and the cooling temperature.

[0108] Adjust the areas of the second adsorption zone 27, the second desorption zone 29, and the second cooling zone 28, and set multiple sections of the second desorption zone 29 and the second cooling zone 28, so as to achieve the purpose of adjusting the desorption concentration multiple and the cooling temperature.

[0109] The composite regenerative rotating bed molecular sieve rotor adsorption and recovery device adopts an oxygen content concentration detector with a one-out-of-two selection method, supplements nitrogen in real time according to the change of oxygen concentration, strictly controls the oxygen content, and ensures safety and stability.

[0110] The second adsorption rotor of the composite regenerative rotating bed molecular sieve rotor adsorption and recovery device is smaller than the first adsorption rotor. The addition of the second adsorption rotor is beneficial to reducing the design standard and cost of the first adsorption rotor.

[0111] Please note that the technical features of the above embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification. The above embodiments only express several implementation manners of the present application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the utility model patent. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.

Claims

1. A composite heat storage rotary bed molecular sieve rotor adsorption and recovery device, characterized in that: Comprising: A first adsorption rotor, the first adsorption rotor including a first adsorption zone, a first desorption zone, and a first cooling zone; A second adsorption rotor, the second adsorption rotor including a second adsorption zone, a second desorption zone, and a second cooling zone; An exhaust gas inlet system, the outlet of the exhaust gas inlet system being communicated with the inlet of the first adsorption zone; An exhaust gas outlet system, the outlet of the first adsorption zone being communicated with the inlet of the exhaust gas outlet system; A condensation system, the outlet of the first desorption zone being communicated with the inlet of the condensation system, the outlet of the condensation system being communicated with the inlet of the second adsorption zone, the outlet of the second adsorption zone being respectively communicated with the exhaust gas inlet system, the inlet of the first cooling zone, and the inlet of the second cooling zone, the outlet of the second desorption zone being communicated with the condensation system; A heating system, the outlet of the first cooling zone being communicated with the inlet of the heating system, the outlet of the second cooling zone being communicated with the inlet of the heating system, the outlet of the heating system being respectively communicated with the inlet of the first desorption zone and the inlet of the second desorption zone.

2. The composite heat storage rotary bed molecular sieve rotor adsorption and recovery device according to claim 1, wherein: The first adsorption rotor is filled with a heat storage material and / or the second adsorption rotor is filled with a heat storage material.

3. The composite heat storage rotary bed molecular sieve rotor adsorption and recovery device according to claim 1, characterized in that: It further includes a nitrogen supply pipeline, the outlet of the nitrogen supply pipeline being communicated with the heating system.

4. The composite heat storage rotary bed molecular sieve rotor adsorption and recovery device according to claim 1, characterized in that: The condensation system includes a condensation pipeline, the outlet of the first desorption zone being communicated with the inlet of the condensation pipeline, the outlet of the condensation pipeline being communicated with the inlet of the second adsorption zone, along the air flow direction, a first desorption fan, a fourth control valve, a condenser, an oxygen concentration detection unit, and a gas-liquid separator are sequentially arranged on the condensation pipeline, and the gas-liquid separator is communicated with a waste liquid storage tank through an eighth control valve.

5. The composite heat storage rotary bed molecular sieve rotor adsorption and recovery device according to claim 4, characterized in that: The outlet of the second desorption zone is sequentially communicated with the condensation pipeline between the fourth control valve and the condenser through a second desorption fan and a ninth control valve.

6. The composite heat storage rotary bed molecular sieve rotor adsorption and recovery device according to claim 1, wherein: The heating system includes a heating pipeline, the outlet of the first cooling zone being communicated with the inlet of the heating pipeline, the outlet of the second cooling zone being communicated with the inlet of the heating pipeline, the outlet of the heating pipeline being respectively communicated with the inlet of the first desorption zone and the inlet of the second desorption zone, and a heater is arranged on the heating pipeline.

7. The composite heat storage rotary bed molecular sieve rotor adsorption and recovery device according to claim 6, characterized in that: The outlet of the heater is communicated with the inlet of the first desorption zone through a fifth control valve; The outlet of the heater is communicated with the inlet of the second desorption zone through an eleventh control valve.

8. The composite heat storage rotary bed molecular sieve rotor adsorption and recovery device according to claim 1, wherein: The exhaust gas inlet system includes an exhaust gas inlet pipeline, along the air 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, and the outlet of the exhaust gas inlet pipeline is communicated with the inlet of the first adsorption zone.

9. The composite heat storage rotary bed molecular sieve rotor adsorption and recovery device according to claim 8, wherein: The outlet of the second adsorption zone is communicated with the inlet of the second cooling zone through a tenth control valve; The outlet of the second adsorption zone is communicated with the inlet of the first cooling zone through a third control valve; The outlet of the second adsorption zone is communicated with the exhaust gas inlet pipeline between the filter and the adsorption fan through a seventh control valve.

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