A VOCs waste gas catalytic combustion treatment device with a built-in heat exchange structure

Abstract

The present application relates to the technical field of VOCs waste gas treatment, and discloses a VOCs waste gas catalytic combustion treatment device with a built-in heat exchange structure, including a catalytic combustion unit and a plurality of adsorption units. The adsorption unit is provided with an activated carbon adsorption assembly for adsorbing organic compounds in the waste gas. In the same period, a part of the adsorption unit is used to absorb organic compounds in the gas discharged from the filter device, and the other part of the adsorption unit is standby. When the absorption is saturated, the desorption steam enters the saturated adsorption unit after being heated by the catalytic combustion unit to perform the desorption step, and the standby adsorption unit replaces it to participate in the absorption of organic compounds. By setting up a backflush tank, the heat of the steam is used to heat the gas in the backflush tank, so that the air inside the backflush tank expands due to the heat, and a high-pressure airflow is generated to reversely purge the filter, which achieves the effect of cleaning the filter on the one hand, and on the other hand, realizes the further effective utilization of the heat generated by the catalytic combustion.

Description

Technical Field

[0001] The present invention relates to the technical field of VOCs waste gas treatment, and in particular to a VOCs waste gas catalytic combustion treatment device with a built-in heat exchange structure. Background Art

[0002] The current mainstream process for treating large volumes of low-concentration organic waste gas is "adsorption concentration plus desorption." Adsorption concentration involves adsorbing pollutants through porous media such as zeolite molecular sieves and activated carbon. Common post-desorption treatment methods include catalytic combustion, incineration, and condensation recovery. Activated carbon has a large adsorption capacity and low price, and catalytic combustion is low-temperature and efficient. Therefore, activated carbon adsorption and desorption plus catalytic combustion technology is relatively common in treating large volumes of low-concentration organic waste gas.

[0003] Catalytic combustion VOCs waste gas treatment equipment is a highly efficient and environmentally friendly technology specifically designed to treat volatile organic compounds (VOCs) generated during industrial production processes. It purifies waste gas by converting organic matter in the waste gas into harmless carbon dioxide and water through a catalytic oxidation reaction. The catalytic combustion process generates a significant amount of heat, which, if allowed to dissipate naturally, would undoubtedly result in a significant waste of resources. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the present invention provides a VOCs waste gas catalytic combustion treatment device with a built-in heat exchange structure, which solves the problem of waste of heat generated by catalytic combustion.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: a VOCs waste gas catalytic combustion treatment device with a built-in heat exchange structure, including a catalytic combustion unit and a plurality of adsorption units, wherein the adsorption unit is provided with an activated carbon adsorption component for adsorbing organic compounds in the waste gas, and in the same period, a part of the adsorption unit is used to absorb the organic compounds in the gas discharged from the filter device, and the other part of the adsorption unit is used as a standby. When the absorption is saturated, the desorption steam is heated by the catalytic combustion unit and enters the saturated adsorption unit for the desorption step, and the standby adsorption unit replaces it to participate in the absorption of organic compounds, and the desorbed organic compounds are used as a standby adsorption unit. The mixture of the desorbed matter and the steam enters the catalytic combustion unit for catalytic combustion treatment. The filtering device includes a filter. The input end of the filter is connected to the exhaust gas pipe. The filter has two output ends, one of which is connected to the adsorption unit, and the other is connected to the back-blowing tank, with a pressure detection valve provided between the two. A spiral heat dissipation pipe is provided in the back-blowing tank. Part of the desorbed steam heated by the catalytic combustion unit flows in the spiral heat dissipation pipe and heats the gas in the back-blowing tank. When the air pressure in the back-blowing tank exceeds the set value of the pressure detection valve, the gas in the back-blowing tank is ejected to reversely purge the inside of the filter.

[0006] Preferably, the adsorption unit has two air inlets and two air outlets, and valves are provided at the air inlets and air outlets. One of the air inlets is connected to the filter device through the air inlet pipe, and the corresponding air outlet is connected to the emission mechanism through the exhaust pipe 1. The exhaust gas is filtered by the filter device to remove particulate impurities, enters the adsorption unit through the air inlet pipe to remove organic compound components, and is finally transported to the emission mechanism through the exhaust pipe 1 for discharge.

[0007] Preferably, the discharge mechanism includes a discharge fan, the air inlet end of the discharge fan is connected to the exhaust pipe, and the exhaust end is connected to the chimney.

[0008] Preferably, the catalytic combustion unit is divided into a catalytic combustion zone and a heat exchange zone, the two are isolated from each other, and a heat exchanger is arranged between the two. The heat exchanger exchanges the heat energy generated in the catalytic combustion zone and transports it to the heat exchange zone. A desorption airflow output pipe runs through the heat exchange zone, one end of the desorption airflow output pipe is connected to the steam generating equipment, and the other end is connected to another air inlet of the adsorption unit. The other air outlet of the adsorption unit is connected to the heat exchange zone through a desorption airflow return pipe. A desorption fan is also arranged between the heat exchange zone and the catalytic combustion zone. The desorbed organic compounds are mixed with steam and preheated in the heat exchange zone and then transported to the catalytic combustion zone by the desorption fan.

[0009] Preferably, the catalytic combustion zone is connected to the chimney through the second exhaust pipe, and the desorbed organic compounds are converted into carbon dioxide and water through catalytic combustion and discharged to the outside through the chimney.

[0010] Preferably, both ends of the spiral heat dissipation tube respectively pass through the back-blowing tank body and are respectively connected to the desorption airflow output pipe and the desorption airflow return pipe. Part of the desorbed steam enters the spiral heat dissipation tube from the desorption airflow output pipe and then directly enters the desorption airflow return pipe.

[0011] Preferably, a flow regulating valve is provided between the spiral heat dissipation tube and the desorption airflow output tube, for regulating the flow of the desorption steam entering the spiral heat dissipation tube.

[0012] The present invention provides a VOCs waste gas catalytic combustion treatment device with a built-in heat exchange structure. It has the following beneficial effects:

[0013] The present invention utilizes the heat generated by the catalytic combustion of the catalytic combustion unit to heat the steam used for desorption, so that the steam temperature is increased to meet the desorption requirements, thereby realizing the reuse of the heat generated by the catalytic combustion, thereby avoiding the problem of resource waste. At the same time, through the setting of the back-blowing tank, the heat of the steam is used to heat the gas in the back-blowing tank, so that the air inside the tank is heated and expanded, generating a high-pressure airflow to reversely purge the filter. On the one hand, the filter cleaning effect is achieved, the service life of the filter is increased, and the maintenance cost of the filter is reduced. On the other hand, the heat generated by the catalytic combustion is further effectively utilized. At the same time, the flow regulating valve is set so that it can cooperate with the desorption fan to perform real-time regulation on the flow of the desorption steam and the concentration of organic compounds in the gas after desorption, thereby achieving the optimal concentration ratio of the catalytic combustion and ensuring the efficiency and effect of the catalytic combustion. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a rear perspective view of a VOCs waste gas catalytic combustion treatment device with a built-in heat exchange structure according to the present invention;

[0015] Figure 2 This is a front perspective view of a VOCs waste gas catalytic combustion treatment device with a built-in heat exchange structure according to the present invention;

[0016] Figure 3 This is a front view of a VOCs waste gas catalytic combustion treatment device with a built-in heat exchange structure according to the present invention;

[0017] Figure 4 is a three-dimensional schematic diagram of the catalytic combustion unit of the present invention;

[0018] Figure 5 It is a schematic diagram of part of the internal structure of the catalytic combustion unit of the present invention;

[0019] Figure 6 Schematic diagram of the structure of the filtering device of the present invention;

[0020] Figure 7 Schematic diagram of the internal structure of the back-blowing tank in the present invention.

[0021] Among them, 1. catalytic combustion unit; 101. catalytic combustion zone; 102. heat exchange zone; 103. heat exchanger; 104. desorption fan; 105. exhaust pipe 2; 2. adsorption unit; 3. filter; 4. air inlet pipe; 5. exhaust pipe 1; 6. exhaust fan; 7. chimney; 8. desorption airflow output pipe; 9. desorption airflow return pipe; 10. valve; 11. backflush tank; 12. pressure detection valve; 13. flow control valve; 14. spiral heat pipe. DETAILED DESCRIPTION

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] Please see the attached Figure 1 -Attached Figure 7 The embodiment of the present invention provides a VOCs waste gas catalytic combustion treatment device with a built-in heat exchange structure, including a catalytic combustion unit 1 and a plurality of adsorption units 2. The adsorption unit 2 is provided with an activated carbon adsorption component for adsorbing organic compounds in the exhaust gas. In the same period, a part of the adsorption unit 2 is used to absorb the organic compounds in the gas discharged from the filter device, and the other part of the adsorption unit 2 is on standby. When the absorption is saturated, the desorption steam is heated by the catalytic combustion unit 1 and enters the saturated adsorption unit 2 for the desorption step. The standby adsorption unit 2 replaces it to participate in the absorption of organic compounds. The desorbed organic compounds are mixed with the steam and enter the catalytic combustion unit Catalytic combustion treatment is carried out in element 1, and the filtering device includes a filter 3. The input end of the filter 3 is connected to the exhaust gas pipe. The filter 3 has two output ends, one of which is connected to the adsorption unit 2, and the other is connected to the back-blowing tank 11, and a pressure detection valve 12 is provided between the two. A spiral heat dissipation pipe 14 is provided in the back-blowing tank 11. Part of the desorbed steam heated by the catalytic combustion unit 1 flows in the spiral heat dissipation pipe 14 and heats the gas in the back-blowing tank 11. When the air pressure in the back-blowing tank 11 exceeds the set value of the pressure detection valve 12, the gas in the back-blowing tank 11 is ejected to reversely purge the inside of the filter 3.

[0024] By setting up the catalytic combustion unit 1, the heat generated by the catalytic combustion of the catalytic combustion unit 1 is used to heat the steam used for desorption, so that the steam temperature is increased to meet the desorption requirements, thereby realizing the reuse of the heat generated by the catalytic combustion, thereby avoiding the problem of waste of resources. At the same time, by setting up the back-blowing tank 11, the heat of the steam is used to heat the gas in the back-blowing tank 11, so that the air inside the back-blowing tank 11 expands due to the heat, generating a high-pressure airflow to reversely blow the filter 3, on the one hand achieving the effect of cleaning the filter 3, increasing the service life of the filter 3, and reducing the maintenance cost of the filter 3, and on the other hand, realizing further effective utilization of the heat generated by the catalytic combustion.

[0025] The adsorption unit 2 has two air inlets and two air outlets, and valves 10 are provided at the air inlets and air outlets. One of the air inlets is connected to the filter device through the air inlet pipe 4, and the corresponding air outlet is connected to the emission mechanism through the exhaust pipe 5. The exhaust gas is filtered by the filter device to remove particulate impurities, enters the adsorption unit 2 through the air inlet pipe 4 to remove organic compound components, and is finally transported to the emission mechanism through the exhaust pipe 5 for discharge.

[0026] Industrial waste gas is filtered by the filter device to remove particulate impurities, and then enters the adsorption unit 2 with the valve 10 open through the intake pipe 4. Through the intermolecular van der Waals force, the activated carbon adsorption component adsorbs the organic compound components in the waste gas in the pores, thereby achieving the purpose of purifying the waste gas.

[0027] It should be noted that, in the adsorption unit 2 used for the step of adsorbing organic compounds, the valves 10 connected to the air inlet pipe 4 and the exhaust pipe 5 are in an open state, and the other set of valves 10 at the air inlet and outlet are in a closed state.

[0028] The discharge mechanism includes a discharge fan 6, the air inlet end of the discharge fan 6 is connected to the exhaust pipe 5, and the exhaust end is connected to the chimney 7.

[0029] By utilizing the suction force generated by the operation of the exhaust fan 6, the exhaust gas flows sequentially through the filter 3, the air inlet pipe 4, the adsorption unit 2, and the exhaust pipe 5, and is finally discharged through the chimney 7.

[0030] The catalytic combustion unit 1 is divided into a catalytic combustion zone 101 and a heat exchange zone 102, which are isolated from each other and a heat exchanger 103 is provided between the two. The heat exchanger 103 exchanges the heat energy generated in the catalytic combustion zone 101 and transfers it to the heat exchange zone 102. A desorption airflow output pipe 8 runs through the heat exchange zone 102. One end of the desorption airflow output pipe 8 is connected to the steam generating device, and the other end is connected to another air inlet of the adsorption unit 2. The other air outlet of the adsorption unit 2 is connected to the heat exchange zone 102 through the desorption airflow return pipe 9. A desorption fan 104 is also provided between the heat exchange zone 102 and the catalytic combustion zone 101. The desorbed organic compounds are mixed with steam and preheated in the heat exchange zone 102, and then transported to the catalytic combustion zone 101 by the desorption fan 104. The catalytic combustion zone 101 is connected to the chimney 7 through the exhaust pipe 2 105. The desorbed organic compounds are converted into carbon dioxide and water through catalytic combustion and discharged to the outside through the chimney 7.

[0031] Catalytic combustion utilizes active sites on the catalyst surface to allow oxygen molecules and pollutants to react on the catalyst surface, reducing the activation energy and increasing reaction efficiency. This allows oxidation reactions, which typically require temperatures above 600°C, to proceed at temperatures between 250 and 300°C, with purification efficiencies generally exceeding 95%. Organic pollutants are oxidized and decomposed to produce CO2 and H2O, releasing significant amounts of heat, thereby purifying exhaust gases. Catalysts typically use precious metals such as Pd and Pt as active components, supported by transition metal oxides or molecular sieves. The final products of catalytic combustion treatment of pollutants are pollution-free CO2 and H2O.

[0032] When the activated carbon adsorption component in a part of the adsorption unit 2 is saturated with organic compounds, it will lose the ability to continue to adsorb organic compounds, but this ability is reversible. The catalytic combustion zone 101 continues to catalytically combust the organic compounds, and the heat generated is transported to the heat exchange zone 102 through the heat exchanger 103, so that the temperature in the heat exchange zone 102 increases, and part of the desorption airflow output pipe 8 is located in the heat exchange zone 102. Of course, in order to improve efficiency, part of the circulation pipe of the heat exchanger 103 can be used to wrap the desorption airflow output pipe 8, or part of the circulation pipe of the heat exchanger 103 can be directly located in the desorption airflow output pipe 8, so that the steam in the desorption airflow output pipe 8 is fully heated to meet the desorption conditions. At the same time, the mixed airflow after desorption also enters the heat exchange zone 102, and is preheated by the heat therein to approach the temperature of catalytic combustion, and then enters the catalytic combustion zone 101, thereby reducing the operating pressure of the catalytic combustion bed in the catalytic combustion zone 101, and further realizing the rational use of thermal energy.

[0033] Both ends of the spiral heat dissipation tube 14 respectively pass through the tank body of the back-blowing tank 11 and are respectively connected to the desorption airflow output pipe 8 and the desorption airflow return pipe 9. Part of the desorbed steam enters the spiral heat dissipation tube 14 from the desorption airflow output pipe 8 and directly enters the desorption airflow return pipe 9.

[0034] When the desorption step is carried out, the desorption steam flows in the desorption airflow output pipe 8, the saturated adsorption unit 2 and the desorption airflow return pipe 9, and also flows in the spiral heat dissipation tube 14, so that the high-temperature desorption steam heats the gas in the back-blowing tank 11, causing the temperature in the back-blowing tank 11 to rise, and the air pressure also rises accordingly. When the air pressure exceeds the set value of the pressure detection valve 12, the pressure detection valve 12 opens, and the gas in the back-blowing tank 11 forms a high-pressure airflow and is ejected to reversely purge the inside of the filter 3. On the one hand, this design achieves the effect of cleaning the filter 3, increases the service life of the filter 3, and reduces the maintenance cost of the filter 3. On the other hand, it achieves further effective utilization of the heat generated by catalytic combustion.

[0035] A flow regulating valve 13 is provided between the spiral heat dissipation tube 14 and the desorption air flow output pipe 8 for regulating the flow of the desorption steam entering the spiral heat dissipation tube 14 .

[0036] Affected by various uncontrollable factors, the desorption effect of the desorption steam on the activated carbon adsorption component in the adsorption unit 2 may change, resulting in a change in the concentration of the organic compound that finally enters the catalytic combustion zone 101. When the concentration of the organic compound is too low, the efficiency of the catalytic combustion will be reduced, and when the concentration of the organic compound is too high, the catalytic combustion will be insufficient. In order to achieve the most ideal catalytic combustion effect, it is necessary to regulate the ratio of the organic compound concentration. The desorption fan 104 can achieve a part of the flow control effect, but relying solely on this control method will have the problem of low control progress and poor effect. The flow regulating valve 13 is used to regulate the flow of desorption steam entering the spiral heat dissipation tube 14 to achieve an auxiliary control effect on the final organic compound concentration. The combination of the two improves the control effect.

[0037] The flow control valve 13, in conjunction with the desorption blower 104, provides real-time control over the flow of desorbed steam and the concentration of organic compounds in the desorbed gas, thereby achieving the optimal concentration ratio for catalytic combustion and ensuring the efficiency and effectiveness of catalytic combustion. Furthermore, by regulating the flow of desorbed steam entering the spiral heat pipe 14 through the flow control valve 13, rapid heat dissipation from the spiral heat pipe 14 is achieved, thereby increasing the total amount of gas entering the blowback tank 11, thereby increasing the subsequent blowback flow rate and improving the blowback effect.

[0038] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A VOCs waste gas catalytic combustion treatment device with a built-in heat exchange structure, comprising a catalytic combustion unit (1) and a plurality of adsorption units (2), characterized in that: The adsorption unit (2) is provided with an activated carbon adsorption component for adsorbing organic compounds in the exhaust gas. During the same period, a portion of the adsorption unit (2) is used to absorb the organic compounds in the gas discharged from the filter device, and the other portion of the adsorption unit (2) is on standby. When the absorption is saturated, the desorption steam is heated by the catalytic combustion unit (1) and enters the saturated adsorption unit (2) for the desorption step. The standby adsorption unit (2) replaces it to participate in the absorption of organic compounds. The desorbed organic compounds are mixed with the steam and enter the catalytic combustion unit (1) for catalytic combustion treatment. The filtering device includes a filter (3). The filter (3) The input end is connected to the exhaust gas pipeline, and the filter (3) has two output ends, one of which is connected to the adsorption unit (2), and the other is connected to the back-blowing tank (11), and a pressure detection valve (12) is provided between the two. A spiral heat dissipation pipe (14) is provided in the back-blowing tank (11), and part of the desorbed steam heated by the catalytic combustion unit (1) flows in the spiral heat dissipation pipe (14) and heats the gas in the back-blowing tank (11). When the gas pressure in the back-blowing tank (11) exceeds the set value of the pressure detection valve (12), the gas in the back-blowing tank (11) is ejected to reversely purge the inside of the filter (3); The catalytic combustion unit (1) is divided into a catalytic combustion zone (101) and a heat exchange zone (102), which are isolated from each other, and a heat exchanger (103) is provided between the two. The heat exchanger (103) exchanges the heat energy generated in the catalytic combustion zone (101) and transports it to the heat exchange zone (102). A desorption airflow output pipe (8) runs through the heat exchange zone (102). One end of the desorption airflow output pipe (8) is connected to the steam generating device, and the other end is connected to another air inlet of the adsorption unit (2). The other air outlet of the adsorption unit (2) is connected to the heat exchange zone (102) through the desorption airflow return pipe (9). A desorption fan (104) is also provided between the heat exchange zone (102) and the catalytic combustion zone (101). The desorbed organic compound is mixed with steam, preheated in the heat exchange zone (102), and then transported to the catalytic combustion zone (101) by the desorption fan (104); Both ends of the spiral heat dissipation pipe (14) respectively penetrate the back-blowing tank (11) and are respectively connected to the desorption airflow output pipe (8) and the desorption airflow return pipe (9); part of the desorption steam enters the spiral heat dissipation pipe (14) from the desorption airflow output pipe (8) and then directly enters the desorption airflow return pipe (9); A flow regulating valve (13) is provided between the spiral heat dissipation tube (14) and the desorption airflow output tube (8) for regulating the flow of the desorption steam entering the spiral heat dissipation tube (14).

2. The VOCs waste gas catalytic combustion treatment equipment with a built-in heat exchange structure according to claim 1 is characterized in that: The adsorption unit (2) is provided with two air inlets and two air outlets, and valves (10) are provided at the air inlets and the air outlets. One of the air inlets is connected to the filter device through the air inlet pipe (4), and the corresponding air outlet is connected to the discharge mechanism through the exhaust pipe (5). The exhaust gas is filtered by the filter device to remove particulate matter impurities, enters the adsorption unit (2) through the air inlet pipe (4) to remove organic compound components, and is finally transported to the discharge mechanism through the exhaust pipe (5) for discharge.

3. The VOCs waste gas catalytic combustion treatment equipment with a built-in heat exchange structure according to claim 2 is characterized in that: The discharge mechanism comprises a discharge fan (6), the air inlet end of the discharge fan (6) is connected to the exhaust pipe (5), and the exhaust end is connected to the chimney (7).

4. The VOCs waste gas catalytic combustion treatment equipment with a built-in heat exchange structure according to claim 3 is characterized in that: The catalytic combustion zone (101) is connected to the chimney (7) through the second exhaust pipe (105), and the desorbed organic compounds are converted into carbon dioxide and water through catalytic combustion and discharged to the outside through the chimney (7).

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