Zeolite adsorption-catalytic combustion device

Abstract

The utility model discloses a zeolite adsorption-catalytic combustion device, which belongs to the technical field of volatile organic compound waste gas treatment and comprises a waste gas source, a desorption gas source, a fixed zeolite adsorption device, a catalytic combustion device, a first electromagnetic heater, a second electromagnetic heater and an exhaust passage. The fixed zeolite adsorption device is provided with a first gas inlet, a first gas outlet, a second gas inlet and a second gas outlet, and the waste gas source, the first gas inlet, the fixed zeolite adsorption device, the first gas outlet and the exhaust channel are sequentially communicated to form an adsorption purification channel; the desorption gas source, the second gas inlet, the fixed zeolite adsorption device, the second gas outlet, the catalytic combustion device and the exhaust channel are sequentially communicated to form a zeolite desorption channel, a first electromagnetic heater is arranged between the second gas inlet and the desorption gas source, and a second electromagnetic heater is arranged between the second gas outlet and the catalytic combustion device; through the electromagnetic heater, the gas heating speed is increased, energy consumption is reduced, and the effect of efficiently purifying volatile organic compound waste gas with low consumption is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of volatile organic compound waste gas treatment, in particular to a zeolite adsorption-catalytic combustion device. Background Art

[0002] Zeolite adsorption-catalytic combustion is an effective purification technology for waste gas with large air volume and low concentration of volatile organic compounds, which has the advantages of high purification efficiency and stable operation of the device, and is widely used in domestic industrial sources and domestic pollution sources.

[0003] The zeolite adsorption-catalytic combustion device usually uses an electric heating method to heat the high-concentration volatile organic compound waste gas desorbed. This heating method has a slow heating rate, poor temperature control effect, and low energy utilization rate, relatively increasing the energy consumption of the device, and there are potential problems of incomplete combustion and non-compliant emissions.

[0004] Therefore, how to design a zeolite adsorption-catalytic combustion device to achieve efficient and low-consumption purification of volatile organic compound waste gas is a technical problem that needs to be urgently solved by those skilled in the art. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a zeolite adsorption-catalytic combustion device aiming at the defects and deficiencies in the prior art. By setting a first electromagnetic heater and a second electromagnetic heater, the heating rate of the gas is increased, the energy consumption is reduced, the temperature control effect is improved, and the technical effect of efficiently and low-consumptionly purifying volatile organic compound waste gas is achieved.

[0006] To achieve the above purpose, the technical solution adopted by the utility model is:

[0007] The utility model provides a zeolite adsorption-catalytic combustion device, which includes a waste gas source, a desorption gas source, a fixed zeolite adsorption device for adsorbing and purifying waste gas, a catalytic combustion device for catalytically treating waste gas, a first electromagnetic heater and a second electromagnetic heater for heating waste gas, and an exhaust passage for the treated gas to flow out;

[0008] The fixed zeolite adsorption device has a first air inlet for waste gas to enter, a first air outlet for the adsorbed and purified gas to be discharged, a second air inlet for desorption gas to enter, and a second air outlet for the desorbed gas to be discharged. The waste gas source, the first air inlet, the fixed zeolite adsorption device, the first air outlet, and the exhaust passage are sequentially connected to form an adsorption purification passage. The desorption gas source, the second air inlet, the fixed zeolite adsorption device, the second air outlet, the catalytic combustion device, and the exhaust passage are sequentially connected to form a zeolite desorption passage. A first electromagnetic heater is provided between the second air inlet and the desorption gas source, and a second electromagnetic heater is provided between the second air outlet and the catalytic combustion device.

[0009] Preferably, a first heat exchanger is provided on the zeolite desorption passage. The first heat exchanger is located between the catalytic combustion device and the exhaust passage. The first heat exchanger has a first air flow passage for delivering gas to the catalytic combustion device and a second air flow passage for discharging the gas processed by the catalytic combustion device. The first air flow passage and the second air flow passage are not connected to each other and can conduct heat transfer.

[0010] Preferably, a second heat exchanger is further provided on the zeolite desorption passage. The second heat exchanger is located between the first heat exchanger and the exhaust passage. The second heat exchanger has a third air flow passage for delivering desorption gas to the fixed zeolite adsorption device and a fourth air flow passage for discharging the gas processed by the catalytic combustion device. The third air flow passage and the fourth air flow passage are not connected to each other and can conduct heat transfer.

[0011] Preferably, both the first electromagnetic heater and the second electromagnetic heater include a housing and a heating component disposed inside the housing. The heating component includes a metal heating tube and a coil wound around the outer periphery of the metal heating tube. A fifth air flow passage for the desorption gas to flow through is provided inside the metal heating tube.

[0012] Preferably, at least two groups of the heating components are arranged side by side inside the housing, and a flow equalizing plate is provided at the gas inlet of the housing.

[0013] Preferably, a shunt flow channel is further provided, which is arranged in parallel with the second heat exchanger. One end of the shunt flow channel is connected to the zeolite desorption passage, and the other end is connected to the first electromagnetic heater. The interface where the shunt flow channel is connected to the zeolite desorption passage is located between the first heat exchanger and the second heat exchanger.

[0014] Preferably, a flow regulating device is provided on the shunt flow channel, and the flow regulating device is in signal connection with the control component.

[0015] Preferably, a filtering device for pre-treating the waste gas is provided between the fixed zeolite adsorption device and the waste gas source.

[0016] Preferably, a first fan is provided between the filtering device and the first air inlet, and a second fan is provided between the second air outlet and the catalytic combustion device.

[0017] Preferably, a first solenoid valve is provided at the first air inlet, a second solenoid valve is provided at the first air outlet, a third solenoid valve is provided at the second air inlet, and a fourth solenoid valve is provided at the second air outlet. The first solenoid valve, the second solenoid valve, the third solenoid valve and the fourth solenoid valve are all in signal connection with the control component.

[0018] The utility model has achieved the following technical effects compared with the prior art:

[0019] 1. The utility model heats the desorption gas introduced into the fixed zeolite adsorption device through the first electromagnetic heater, and heats the desorbed gas introduced into the catalytic combustion device through the second electromagnetic heater. Compared with the electric heating method in the prior art, the electromagnetic heater adopted by the utility model can accelerate the heating speed of the gas, reduce the energy consumption, improve the temperature control effect, solve the problems of incomplete combustion and non-compliant emissions existing in the prior art, and improve the safety performance.

[0020] Other technical solutions of the utility model have achieved the following technical effects compared with the prior art:

[0021] 2. The utility model realizes the heat exchange between the high-temperature gas discharged from the catalytic combustion device and the waste gas to be treated flowing into the catalytic combustion device through the first heat exchanger, and realizes the heat exchange between the high-temperature gas after the first heat exchange and the gas flowing in from the desorption gas source through the second heat exchanger, realizing the full recovery and utilization of heat, reducing the temperature that the first electromagnetic heater and the second electromagnetic heater need to heat, improving the heating speed, and reducing the energy consumption;

[0022] In addition, through the flow regulating device, most of the gas after the first heat exchange is introduced into the first electromagnetic heater. Compared with the setting form of discharging all the waste gas discharged from the catalytic combustion device after secondary heat exchange, or introducing it into the first electromagnetic heater after secondary heat exchange, the utility model improves the temperature of the mixed gas introduced into the first electromagnetic heater, and further reduces the energy consumption of the first electromagnetic heater. Description of the Drawings

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required for the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0024] Figure 1 It is a schematic structural diagram of a zeolite adsorption-catalytic combustion device.

[0025] Among them, 1. Waste gas source; 2. Desorption gas source; 3. Fixed zeolite adsorption device; 4. Catalytic combustion device; 5. First electromagnetic heater; 6. Second electromagnetic heater; 7. Exhaust passage; 8. First air inlet; 9. First air outlet; 10. Second air inlet; 11. Second air outlet; 12. First heat exchanger; 13. Second heat exchanger; 14. Housing; 15. Metal heating tube; 16. Coil; 17. Flow regulating device; 18. Filter device; 19. First fan; 20. Second fan; 21. First solenoid valve; 22. Second solenoid valve; 23. Third solenoid valve; 24. Fourth solenoid valve; 25. Control component. Detailed implementation manners

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0027] To make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the drawings and specific implementation manners.

[0028] As Figure 1 shown, the present invention provides a zeolite adsorption-catalytic combustion device, which can also be called a zeolite adsorption catalytic combustion device, including a waste gas source 1, a desorption gas source 2, a fixed zeolite adsorption device 3 for adsorbing and purifying waste gas, a catalytic combustion device 4 for catalytically treating waste gas, a first electromagnetic heater 5 and a second electromagnetic heater 6 for heating waste gas, and an exhaust passage 7 for discharging the treated gas;

[0029] The fixed zeolite adsorption device 3 has a first air inlet 8 for the waste gas to enter, a first air outlet 9 for the adsorbed and purified waste gas to be discharged, a second air inlet 10 for the desorption gas to enter, and a second air outlet 11 for the desorbed gas to be discharged. The waste gas source 1, the first air inlet 8, the fixed zeolite adsorption device 3, the first air outlet 9, and the exhaust passage 7 are connected in sequence to form an adsorption and purification passage. The desorption gas source 2, the second air inlet 10, the fixed zeolite adsorption device 3, the second air outlet 11, the catalytic combustion device 4, and the exhaust passage 7 are connected in sequence to form a zeolite desorption passage. A first electromagnetic heater 5 is provided between the second air inlet 10 and the desorption gas source 2, and a second electromagnetic heater 6 is provided between the second air outlet 11 and the catalytic combustion device 4.

[0030] In this application, by using the first electromagnetic heater 5 to heat the desorption gas introduced into the fixed zeolite adsorption device 3 and using the second electromagnetic heater 6 to heat the desorbed gas introduced into the catalytic combustion device 4, the heating speed of the gas is accelerated, the temperature control effect is improved, and the energy consumption is reduced. The problems of potential incomplete combustion and non-compliant emissions are solved, and the safety performance is improved. The desorption gas source 2 provides clean gas.

[0031] The temperature of the gas discharged from the catalytic combustion device 4 is usually between 200°C and 400°C, and the temperature is relatively high. To make full use of the heat energy in this part of the gas, a first heat exchanger 12 is provided on the zeolite desorption passage. The first heat exchanger 12 is located between the catalytic combustion device 4 and the exhaust passage 7. The first heat exchanger 12 has a first air flow passage for delivering the waste gas to be treated to the catalytic combustion device 4 and a second air flow passage for discharging the gas treated by the catalytic combustion device 4. The first air flow passage and the second air flow passage are not connected to each other and can conduct heat transfer, so that the high-temperature gas discharged from the catalytic combustion device 4 exchanges heat with the waste gas to be treated flowing towards the catalytic combustion device 4, increasing the temperature of the waste gas to be treated, achieving full utilization of the heat, and reducing the energy consumption of the second electromagnetic heater 6.

[0032] A second heat exchanger 13 is also provided on the zeolite desorption channel. The second heat exchanger 13 is located between the first heat exchanger 12 and the exhaust channel 7. The second heat exchanger 13 has a third air flow channel for delivering desorption gas to the fixed zeolite adsorption device 3 and a fourth air flow channel for discharging the gas processed by the catalytic combustion device 4. Moreover, the third air flow channel and the fourth air flow channel are not connected to each other and can conduct heat transfer. The high-temperature gas discharged from the catalytic combustion device 4 is subjected to secondary heat exchange through the second heat exchanger 13 and then discharged through the exhaust channel 7, realizing the full recovery and utilization of the heat in the discharged high-temperature gas; the desorption gas is preheated through the second heat exchanger 13 and then flows into the first electromagnetic heater 5 for heating, reducing the energy consumption of the first electromagnetic heater 5. In some embodiments, the gas heated by the first electromagnetic heater 5 is heated to 180 to 200 degrees Celsius, and the gas heated by the second electromagnetic heater 6 is heated to above 300 degrees Celsius.

[0033] Both the first electromagnetic heater 5 and the second electromagnetic heater 6 include a housing 14 and a heating component disposed inside the housing 14. The heating component includes a metal heating tube 15 and a coil 16 wound around the outer periphery of the metal heating tube 15. A fifth air flow channel for the desorption gas to flow through is provided inside the metal heating tube 15. The coil 16 is in signal connection with the control component 25. Whether the coil 16 is energized is adjusted through the control component 25. In some embodiments, the control component 25 is a PLC control unit. By conducting electricity to the coil 16 through the PLC control unit, the metal heating tube 15 can be heated to above 400 degrees Celsius in about 2 minutes.

[0034] At least two groups of heating components arranged side by side are provided inside the housing 14. A flow equalizing plate is provided at the air inlet of the housing 14. The number and arrangement positions of the flow equalizing holes on the flow equalizing plate correspond to the number and arrangement positions of the heating components arranged side by side, so that the air flow can uniformly flow into each heating component. Compared with the method of only arranging one set of heating devices, the heating efficiency of the desorption gas can be improved; in addition, to further improve the heating efficiency, in some embodiments, eddy currents can be generated between the coils 16 of adjacent heating components, thereby further improving the heating efficiency of the desorption gas and reducing the energy consumption. In some embodiments, two rows and four columns of heating components are provided inside the housing 14.

[0035] The utility model further includes a shunt flow channel arranged in parallel with the second heat exchanger 13. One end of the shunt flow channel is communicated with the zeolite desorption channel, and the other end is communicated with the first electromagnetic heater 5. Moreover, the interface where the shunt flow channel is connected to the zeolite desorption channel is located between the first heat exchanger 12 and the second heat exchanger 13. In some embodiments, the high-temperature gas input through the shunt flow channel is mixed with the gas introduced from the desorption gas source 2 and then introduced into the first electromagnetic heater 5. Since the high-temperature gas input through the shunt flow channel has a higher temperature than the gas introduced from the desorption gas source 2, such a setting can increase the temperature of the mixed gas introduced into the first electromagnetic heater 5 and further reduce the energy consumption of the first electromagnetic heater 5. A flow rate regulating device 17 is provided on the shunt flow channel, and the flow rate regulating device 17 is in signal connection with the control assembly 25. In some embodiments, the flow rate regulating device 17 is a flow rate regulating valve.

[0036] Furthermore, a filtering device 18 for pre-treating the waste gas is provided between the fixed zeolite adsorption device 3 and the waste gas source 1. By providing the filtering device 18, the particulate matter in the waste gas can be filtered out, and the adsorption efficiency of the fixed zeolite adsorption device 3 can be improved.

[0037] Furthermore, a first blower 19 is provided between the filtering device 18 and the first air inlet 8, and a second blower 20 is provided between the second air outlet 11 and the catalytic combustion device 4.

[0038] The zeolite adsorption-catalytic combustion device of the utility model is an intermittent desorption device, which is applicable to small and medium-sized enterprises with intermittent emissions of volatile organic compounds. Therefore, a first solenoid valve 21 is provided at the first air inlet 8, a second solenoid valve 22 is provided at the first air outlet 9, a third solenoid valve 23 is provided at the second air inlet 10, and a fourth solenoid valve 24 is provided at the second air outlet 11. The first solenoid valve 21, the second solenoid valve 22, the third solenoid valve 23, and the fourth solenoid valve 24 are all in signal connection with the control assembly 25.

[0039] Working principle: During the enterprise production stage (i.e., the adsorption stage of the fixed zeolite adsorption device 3), under the control of the control assembly 25, the first solenoid valve 21 and the second solenoid valve 22 are opened, and the third solenoid valve 23 and the fourth solenoid valve 24 are closed. The waste gas in the waste gas source 1, under the guidance of the first blower 19, enters the fixed zeolite adsorption device 3 after the particulate matter in the waste gas is removed by the filtering device 18, and the waste gas is discharged from the exhaust passage 7 after adsorption treatment;

[0040] After being processed for a period of time, when the enterprise is not in production, under the control of the control assembly 25, the first solenoid valve 21 and the second solenoid valve 22 are closed, the third solenoid valve 23 and the fourth solenoid valve 24 are opened, and the second blower 20 is turned on to perform hot air desorption on the fixed zeolite adsorption device 3. The desorbed waste gas enters the catalytic combustion device 4 for preheating, heating, and catalytic oxidation reaction, and finally pollution-free carbon dioxide and water vapor are discharged.

[0041] In the initial heating-up stage, the flow regulating device 17 is controlled so that the desorbed gas is mainly clean gas from the desorption gas source 2. This part of the gas first undergoes indirect heat exchange in the second heat exchanger 13, and then is heated by the first electromagnetic heater 5 and heated up to 180 to 200 degrees Celsius, and then is introduced into the fixed zeolite adsorption device 3 to desorb the volatile organic compounds adsorbed on the fixed zeolite adsorption device 3. The desorbed waste gas passes through the fourth solenoid valve 24 and the second fan 20 and enters the first heat exchanger 12. After indirect heat exchange in the first heat exchanger 12, it is heated by the second electromagnetic heater 6 and heated up to above 300 degrees Celsius. Then, the heated gas enters the catalytic combustion device 4 for reaction. After the reaction, the waste gas is divided into two streams after passing through the first heat exchanger 12. By controlling the flow regulating device 17, a small amount of desorbed waste gas enters the second heat exchanger 13 and is discharged to the exhaust passage 7 after secondary indirect heat exchange. Most of the desorbed waste gas passes through the flow regulating device 17 and is mixed with the clean gas (from the desorption gas source 2) after passing through the second heat exchanger 13. After mixing, it enters the first electromagnetic heater 5 for heating, and after heating, it is desorbed again. The entire desorption stage is controlled within 1 hour.

[0042] It should be noted that for those skilled in the art, it is obvious that the present utility model is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present utility model, and any reference signs in the claims should not be regarded as limiting the claims involved.

Claims

1. A zeolite adsorption-catalytic combustion device, characterized in that: It includes an exhaust gas source, a desorption gas source, a fixed zeolite adsorption device for adsorbing and purifying the exhaust gas, a catalytic combustion device for catalytically treating the exhaust gas, a first electromagnetic heater and a second electromagnetic heater for heating the exhaust gas, and an exhaust passage for the treated gas to flow out; The fixed zeolite adsorption device comprises a first air inlet for exhaust gas, a first air outlet for exhaust gas after adsorption and purification, a second air inlet for exhaust gas for desorption, and a second air outlet for exhaust gas after desorption. The exhaust gas source, the first air inlet, the fixed zeolite adsorption device, the first air outlet and the exhaust channel are connected in sequence to form an adsorption purification channel. The desorption gas source, the second air inlet, the fixed zeolite adsorption device, the second air outlet, the catalytic combustion device and the exhaust channel are connected in sequence to form a zeolite desorption channel. The first electromagnetic heater is provided between the second air inlet and the desorption gas source, and the second electromagnetic heater is provided between the second air outlet and the catalytic combustion device.

2. The zeolite adsorption-catalytic combustion device according to claim 1, characterized in that: A first heat exchanger is provided on the zeolite desorption channel, and the first heat exchanger is located between the catalytic combustion device and the exhaust channel. The first heat exchanger has a first airflow channel for transporting gas to the catalytic combustion device and a second airflow channel for discharging gas processed by the catalytic combustion device. The first airflow channel and the second airflow channel are not connected to each other and can perform heat transfer.

3. The zeolite adsorption-catalytic combustion device according to claim 2, characterized in that: A second heat exchanger is also provided on the zeolite desorption channel, and the second heat exchanger is located between the first heat exchanger and the exhaust channel. The second heat exchanger has a third air flow channel for conveying desorption gas to the fixed zeolite adsorption device and a fourth air flow channel for discharging the gas processed by the catalytic combustion device, and the third air flow channel and the fourth air flow channel are not connected to each other and can carry out heat transfer.

4. The zeolite adsorption-catalytic combustion device according to claim 3, characterized in that: The first electromagnetic heater and the second electromagnetic heater both include a shell and a heating component disposed in the shell, the heating component includes a metal heating tube and a coil wound around the outer circumference of the metal heating tube, and a fifth airflow channel for the desorption gas to flow is provided inside the metal heating tube.

5. The zeolite adsorption-catalytic combustion device according to claim 4, characterized in that: At least two groups of the heating components arranged side by side are arranged in the shell, and a flow equalizing plate is arranged at the gas inlet of the shell.

6. The zeolite adsorption-catalytic combustion device according to any one of claims 3 to 5, characterized in that: It also includes a diverter channel arranged in parallel with the second heat exchanger, one end of the diverter channel is connected to the zeolite desorption channel, and the other end is connected to the first electromagnetic heater, and the interface connecting the diverter channel and the zeolite desorption channel is located between the first heat exchanger and the second heat exchanger.

7. The zeolite adsorption-catalytic combustion device according to claim 6, characterized in that: The branch flow channel is provided with a flow regulating device, and the flow regulating device is connected to the control component signal.

8. The zeolite adsorption-catalytic combustion device according to claim 1, characterized in that: A filtering device for pre-treating the exhaust gas is provided between the fixed zeolite adsorption device and the exhaust gas source.

9. The zeolite adsorption-catalytic combustion device according to claim 8, characterized in that: A first fan is provided between the filtering device and the first air inlet, and a second fan is provided between the second air outlet and the catalytic combustion device.

10. The zeolite adsorption-catalytic combustion device according to claim 1, characterized in that: A first solenoid valve is provided at the first air inlet, a second solenoid valve is provided at the first air outlet, a third solenoid valve is provided at the second air inlet, and a fourth solenoid valve is provided at the second air outlet. The first solenoid valve, the second solenoid valve, the third solenoid valve and the fourth solenoid valve are all connected to the control component signal.

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