Zeolite drum solvent recovery system

Abstract

The utility model discloses a zeolite drum solvent recovery system which comprises a dry filter and a zeolite drum, the output end of the dry filter is connected with the zeolite drum through a pipeline, at least one desorption area and one adsorption area are arranged in the zeolite drum, the desorption area is connected with a solvent recovery system through an outer pipeline, and the zeolite drum is connected with the solvent recovery system through a pipeline. An outer pipeline of the adsorption area is connected with a gas exhaust system; the gas exhaust system comprises a waste gas combustion system, the waste gas combustion system comprises zeolite fixed beds, a desorption fan and a catalytic combustion unit, the first zeolite fixed bed and the second zeolite fixed bed are arranged between the dry filter and a gas-liquid separator in the solvent recovery system and are connected with the desorption fan through a pipeline, and the catalytic combustion unit is connected with the desorption fan through a pipeline. The desorption fan is in pipeline connection with the catalytic combustion unit, and the catalytic combustion unit is in pipeline connection with the input end of the exhaust funnel.

Description

Technical Field

[0001] The utility model belongs to the technical field of chemical engineering, and in particular relates to a zeolite drum solvent recovery system. Background Art

[0002] In the chemical production process, the zeolite drum solvent recovery system plays a vital role in reducing environmental pollution and resource waste. In the traditional method, the organic solvent adsorbed on the zeolite is volatilized by heating the zeolite drum and recovered through a condensation device. However, this method has low recovery efficiency and high energy consumption. In addition, during the heating process, the organic solvent is prone to decomposition, which affects the recovery quality and limits its effect in practical applications. Summary of the invention

[0003] The utility model aims to provide a zeolite drum solvent recovery system to solve the problems raised in the above background technology.

[0004] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme, including: a dry filter and a zeolite drum, wherein the output end of the dry filter is connected to the zeolite drum pipeline, and the zeolite drum has at least one desorption zone and one adsorption zone, wherein the outer pipeline of the desorption zone is connected to a solvent recovery system, and the outer pipeline of the adsorption zone is connected to a gas exhaust system;

[0005] The gas exhaust system comprises:

[0006] The main fan is connected to the adsorption zone pipeline;

[0007] The exhaust pipe is connected to the output pipeline of the main fan;

[0008] And an exhaust gas combustion system is arranged in parallel between the dry filter and the exhaust pipe, the exhaust gas combustion system includes: a first zeolite fixed bed, a second zeolite fixed bed, a desorption fan and a catalytic combustion unit, the first zeolite fixed bed and the second zeolite fixed bed are both arranged between the dry filter and the gas-liquid separator in the solvent recovery system, for further removing residual solvent molecules in the gas treated by the dry filter, and are connected to the desorption fan pipeline, the desorption fan is connected to the catalytic combustion unit pipeline, and the catalytic combustion unit is connected to the input end pipeline of the exhaust pipe.

[0009] Preferably, the second zeolite fixed bed is connected to an external fresh air system pipeline.

[0010] Preferably, the catalytic combustion unit comprises at least a preheating zone, a combustion zone and a cooling zone, wherein the preheating zone is connected to the desorption fan pipeline, the combustion zone is connected to the input end pipeline of the exhaust pipe, and the cooling zone is connected to the first zeolite fixed bed and the second zeolite fixed bed pipeline.

[0011] Preferably, the solvent recovery system comprises: a heat exchanger, a condenser, a first refrigeration system, a second refrigeration system and a pipeline heating device, the cold source input end of the heat exchanger is connected to the output end pipeline in the first refrigeration system, the heat source input end of the heat exchanger is connected to the output end pipeline in the desorption zone, the cold source output end of the heat exchanger is connected to the input end in the desorption zone through the pipeline heating device, the heat source output end of the heat exchanger is connected to the first input end pipeline in the condenser, the first output end of the condenser is connected to the input end pipeline in the second refrigeration system, the output end of the second refrigeration system is connected to the second input end pipeline in the condenser, and the second output end of the condenser is connected to the gas-liquid separator pipeline.

[0012] Preferably, the dry filter, zeolite drum, main fan, exhaust pipe, exhaust gas combustion system, solvent recovery system, fresh air system, first refrigeration system, second refrigeration system, and pipeline heating device are all electrically connected to a control system and are uniformly controlled by the control system.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] On the one hand, the unique configuration of the dry filter and the zeolite drum significantly reduces the solvent molecules and impurities that enter the subsequent system, thereby improving the separation and recovery efficiency of the solvent in the zeolite drum. This helps to reduce raw material consumption and improve resource utilization. At the same time, the use of the dry filter also reduces the damage of solvent molecules to the zeolite drum and solvent recovery system, effectively extending the service life of the system and reducing maintenance frequency and costs.

[0015] On the other hand, the exhaust gas combustion system is set up to achieve deep removal of residual solvent molecules in the gas treated by the dry filter, thereby enhancing environmental protection performance. In particular, the application of the catalytic combustion unit not only ensures the thorough combustion of solvent molecules, but also improves the energy utilization efficiency of the entire system and reduces energy consumption through heat energy conversion. At the same time, the preheating zone, combustion zone and cooling zone included in the catalytic combustion unit form an efficient synergistic effect, further improving the solvent treatment efficiency, and also helping to reduce the emission of harmful substances. In addition, the effective coordination of the main fan and the exhaust pipe ensures the continuity and smoothness of the gas flow, so that the purified gas can be discharged efficiently.

[0016] In summary, the utility model not only solves the problems of low heating efficiency and insufficient solvent recovery in the prior art, but also shows obvious positive effects in improving processing efficiency, saving energy, reducing maintenance costs, protecting the environment, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation to the present invention.

[0018] Figure 1 It is the piping connection diagram of the zeolite drum solvent recovery system;

[0019] Figure 2 Pipeline connection diagram for the gas exhaust system;

[0020] Figure 3 This is the piping connection diagram for the solvent recovery system;

[0021] Figure 4 This is the piping connection diagram of the exhaust gas combustion system;

[0022] In the figure: 1. dry filter; 2. zeolite drum; 3. desorption zone; 4. adsorption zone; 5. solvent recovery system; 6. gas exhaust system; 7. main fan; 8. exhaust pipe; 9. exhaust gas combustion system; 10. first zeolite fixed bed; 11. second zeolite fixed bed; 12. desorption fan; 13. catalytic combustion unit; 14. fresh air system; 15. preheating zone; 16. combustion zone; 17. cooling zone; 18. heat exchanger; 19. condenser; 20. first refrigeration system; 21. second refrigeration system; 22. pipeline heating device. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0024] Reference Figure 1-Figure 4 The utility model proposes a technical solution of a zeolite drum solvent recovery system, comprising: a dry filter 1 and a zeolite drum 2, wherein the output end of the dry filter 1 is connected to the zeolite drum 2 by a pipeline, and the zeolite drum 2 has at least one desorption zone 3 and one adsorption zone 4, wherein the outer pipeline of the desorption zone 3 is connected to a solvent recovery system 5, and the outer pipeline of the adsorption zone 4 is connected to a gas exhaust system 6;

[0025] The gas exhaust system 6 comprises:

[0026] The main fan 7 is connected to the adsorption zone 4 pipeline;

[0027] The exhaust pipe 8 is connected to the output end pipeline of the main fan 7;

[0028] And an exhaust gas combustion system 9 is arranged in parallel between the dry filter 1 and the exhaust pipe 8, and the exhaust gas combustion system 9 includes: a first zeolite fixed bed 10, a second zeolite fixed bed 11, a desorption fan 12 and a catalytic combustion unit 13. The first zeolite fixed bed 10 and the second zeolite fixed bed 11 are both arranged between the dry filter 1 and the gas-liquid separator 23 in the solvent recovery system 5, and are used to further remove residual solvent molecules in the gas treated by the dry filter 1, and are connected to the desorption fan 12 pipeline, the desorption fan 12 is connected to the catalytic combustion unit 13 pipeline, and the catalytic combustion unit 13 is connected to the input end pipeline of the exhaust pipe 8.

[0029] In this embodiment, the unique integration of the dry filter 1, the zeolite drum 2, the solvent recovery system 5 and the gas exhaust system 6 not only improves the efficiency of solvent recovery and treatment, but also optimizes the energy utilization and environmental protection performance of the entire system.

[0030] First, the use of the dry filter 1 greatly reduces the probability of solvent molecules and other impurities entering the subsequent system, effectively protecting the operating efficiency of the zeolite drum 2 and the solvent recovery system 5, thereby extending the system life and reducing maintenance costs. Secondly, the fine design of the zeolite drum 2, including at least one desorption zone 3 and adsorption zone 4, significantly improves the separation and recovery efficiency of the solvent, allowing the solvent recovery system to further purify the recovered solvent, improve resource utilization, and reduce raw material consumption.

[0031] In addition, the cooperation between the main fan 7 and the exhaust pipe 8 ensures the smooth flow of gas, so that the purified gas can be discharged efficiently. The specially designed exhaust gas combustion system 9 further improves the solvent treatment efficiency and strengthens the overall environmental protection performance through the deep treatment of the first zeolite fixed bed 10 and the second zeolite fixed bed 11.

[0032] Through the synergistic effect of the desorption fan 12 and the catalytic combustion unit 13, the residual solvent molecules in the exhaust gas are effectively transported and harmlessly treated, which not only achieves the complete combustion of the solvent molecules, but also improves the energy utilization efficiency of the entire system and reduces energy consumption through heat energy conversion.

[0033] Specifically, the catalytic combustion unit 13 includes at least a preheating zone 15, a combustion zone 16 and a cooling zone 17, wherein the preheating zone 15 is connected to the desorption fan 12 pipeline, the combustion zone 16 is connected to the input end pipeline of the exhaust pipe 8, and the cooling zone 17 is connected to the first zeolite fixed bed 10 and the second zeolite fixed bed 11 pipeline.

[0034] The preheating zone 15 is connected to the desorption blower 12 to preheat the incoming solvent-containing exhaust gas and raise its temperature to the level required for catalytic combustion. This improves combustion efficiency and reduces energy consumption because the preheated gas is more likely to be effectively catalytically burned in the combustion zone 16.

[0035] The combustion zone 16 is the core part of catalytic combustion, where VOCs (volatile organic compounds) and other solvent molecules are converted into CO2 and water vapor under the action of catalysts. Such a design not only completely eliminates harmful gas emissions, but also generates heat through exothermic reactions, which can be recycled in the system, further enhancing energy efficiency.

[0036] The cooling zone 17 is used to reduce the temperature of the treated gas to a level suitable for subsequent treatment or discharge. By connecting with the first zeolite fixed bed 10 and the second zeolite fixed bed 11, the cooling zone 17 helps to keep these zeolite fixed beds at the optimal operating temperature, thereby ensuring the highest adsorption efficiency and equipment life.

[0037] Furthermore, the switching of the preheating zone 15, the combustion zone 16 and the cooling zone 17 is achieved through an integrated control system. The control system can monitor and adjust the working status of each component by electrically connecting the dry filter 1, the zeolite drum 2, the main fan 7, the exhaust pipe 8, the exhaust gas combustion system 9, the solvent recovery system 5, the fresh air system 14, the first refrigeration system 20, the second refrigeration system 21 and the pipeline heating device 22.

[0038] Specifically, the temperature and gas flow in the catalytic combustion unit 13 are controlled by:

[0039] Temperature and pressure sensors are installed in various areas of the catalytic combustion unit 13 to monitor the temperature and gas flow conditions in the area in real time.

[0040] At the same time, the system is equipped with automatic valves to control the flow of gas to different areas. According to the processing needs, the control system will command these valves to open or close to guide the gas flow to the preheating zone 15, the combustion zone 16 or the cooling zone 17.

[0041] Based on the information fed back by the sensors and the preset processing parameters, the control system uses programmed logic to decide when to switch zones. For example, when the temperature in the combustion zone 16 reaches a certain threshold, the control system will activate the cooling zone 17 to ensure a safe discharge temperature.

[0042] Specifically, the solvent recovery system 5 includes: a heat exchanger 18, a condenser 19, a first refrigeration system 20, a second refrigeration system 21 and a pipeline heating device 22. The cold source input end of the heat exchanger 18 is connected to the output end pipeline of the first refrigeration system 20, the heat source input end of the heat exchanger 18 is connected to the output end pipeline in the desorption zone 3, the cold source output end of the heat exchanger 18 is connected to the input end of the desorption zone 3 through the pipeline heating device 22, the heat source output end of the heat exchanger 18 is connected to the first input end pipeline of the condenser 19, the first output end of the condenser 19 is connected to the input end pipeline of the second refrigeration system 21, the output end of the second refrigeration system 21 is connected to the second input end pipeline of the condenser 19, and the second output end of the condenser 19 is connected to the gas-liquid separator 23 pipeline.

[0043] In this embodiment, the heat exchanger 18 uses the cold source provided by the first refrigeration system 20 to cool the gas containing the solvent output from the desorption zone 3. By lowering the temperature, the solvent gas condenses into a liquid state, making it easier to be recovered. At the same time, the heat released in this process is recovered and can be used to heat the gas before entering the desorption zone 3, thereby improving the energy efficiency of the overall system.

[0044] After the initial heat exchange, the solvent gas enters the condenser 19, wherein the first input end receives the solvent-containing gas from the heat exchanger 18. The first output end sends the colder gas to the second refrigeration system 21 for further cooling to achieve more complete solvent condensation. Then, the colder gas returns to the second input end of the condenser 19 to ensure maximum recovery of the solvent.

[0045] At the same time, the second refrigeration system 21 further enhances the condensation effect, ensuring that the solvent can be effectively separated from the gas even at low temperatures, which is particularly critical for recovering high-boiling-point solvents. Finally, a small amount of uncondensed solvent contained in the gas coming out of the condenser 19 is also separated in the gas-liquid separator 23. This ensures that the gas discharged into the environment is clean and meets environmental protection standards.

[0046] In one embodiment, the second zeolite fixed bed 11 is connected to an external fresh air system 14 through a pipeline.

[0047] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A zeolite drum solvent recovery system, comprising: A dry filter (1) and a zeolite drum (2), wherein the output end of the dry filter (1) is connected to the zeolite drum (2) through a pipeline, and the zeolite drum (2) has at least one desorption zone (3) and one adsorption zone (4), wherein the outer pipeline of the desorption zone (3) is connected to a solvent recovery system (5), and the outer pipeline of the adsorption zone (4) is connected to a gas exhaust system (6); Characterized in that the gas exhaust system (6) comprises: A main fan (7) is connected to a pipeline of the adsorption zone (4); An exhaust pipe (8) connected to an output end pipeline of the main fan (7); and an exhaust gas combustion system (9) arranged in parallel between the dry filter (1) and the exhaust pipe (8), the exhaust gas combustion system (9) comprising: a zeolite fixed bed, a desorption fan (12) and a catalytic combustion unit (13), the first zeolite fixed bed (10) and the second zeolite fixed bed (11) are both arranged between the dry filter (1) and the gas-liquid separator (23) in the solvent recovery system (5), for further removing residual solvent molecules in the gas treated by the dry filter (1), and are connected to the desorption fan (12) pipeline, the desorption fan (12) is connected to the catalytic combustion unit (13) pipeline, and the catalytic combustion unit (13) is connected to the input end pipeline of the exhaust pipe (8).

2. A zeolite drum solvent recovery system according to claim 1, characterized in that: The second zeolite fixed bed (11) is connected to a pipeline of an external fresh air system (14).

3. A zeolite drum solvent recovery system according to claim 1, characterized in that: The catalytic combustion unit (13) comprises at least a preheating zone (15), a combustion zone (16) and a cooling zone (17), wherein the preheating zone (15) is connected to a desorption fan (12) pipeline, the combustion zone (16) is connected to an input end pipeline of an exhaust pipe (8), and the cooling zone (17) is connected to a first zeolite fixed bed (10) and a second zeolite fixed bed (11) pipeline.

4. A zeolite drum solvent recovery system according to claim 1, characterized in that The solvent recovery system (5) comprises: a heat exchanger (18), a condenser (19), a first refrigeration system (20), a second refrigeration system (21) and a pipeline heating device (22), wherein the cold source input end of the heat exchanger (18) is connected to the output end pipeline of the first refrigeration system (20), the heat source input end of the heat exchanger (18) is connected to the output end pipeline of the desorption zone (3), the cold source output end of the heat exchanger (18) is connected to the input end of the desorption zone (3) through the pipeline heating device (22), the heat source output end of the heat exchanger (18) is connected to the first input end pipeline of the condenser (19), the first output end of the condenser (19) is connected to the input end pipeline of the second refrigeration system (21), the output end of the second refrigeration system (21) is connected to the second input end pipeline of the condenser (19), and the second output end of the condenser (19) is connected to the gas-liquid separator (23) pipeline.

5. A zeolite drum solvent recovery system according to claim 1, characterized in that The dry filter (1), zeolite drum (2), main fan (7), exhaust pipe (8), waste gas combustion system (9), solvent recovery system (5), fresh air system (14), first refrigeration system (20), second refrigeration system (21), and pipeline heating device (22) are all electrically connected to a control system and are uniformly controlled by the control system.

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