Catalytic oxidation furnace for purifying waste gas

Abstract

The catalytic oxidation furnace comprises a catalytic furnace body, a middle catalytic box is arranged in the middle of the catalytic furnace body, a pretreatment unit is arranged on the right side of the middle catalytic box, and a strengthening treatment unit is arranged on the left side of the middle catalytic box; a first flow equalizing plate, an upper-layer catalyst, a second flow equalizing plate and a lower-layer catalyst are sequentially arranged in the middle catalysis box from top to bottom and are used for filtering and adsorbing. According to the invention, through the arrangement of an active carbon adsorption layer, a medium-efficiency filter and a primary-efficiency filter in the middle catalysis box and the pre-treatment unit, impurities and toxicants in waste gas are effectively removed, and the poisoning risk of a catalyst is reduced; the working environment of the catalyst is optimized, the deactivation possibility of the catalyst is reduced, the activity of the deactivated catalyst can be recovered in time in cooperation with a catalyst regeneration system, and the service life of the catalyst is further prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of waste gas purification and emission, and more specifically, to a catalytic oxidation furnace for purifying waste gas. Background Art

[0002] In the process of industrial production, a large amount of waste gas containing harmful substances will be generated, such as volatile organic compounds (VOCs), nitrogen oxides (NOx), sulfur oxides (SOx), etc. If these waste gases are directly discharged without effective treatment, they will cause serious pollution to the atmospheric environment and endanger human health and ecological balance. As an important waste gas treatment equipment, the catalytic oxidation furnace works on the principle that under the action of the catalyst, the harmful substances in the waste gas undergo oxidation reaction with oxygen at a lower temperature and are converted into harmless substances such as carbon dioxide and water.

[0003] However, there are many problems with existing catalytic oxidation furnaces. On the one hand, during long-term operation, the catalyst is easily deactivated by factors such as high temperature shock and deposition of poisons (such as heavy metals, particulate matter, etc.). Once the catalyst is deactivated, the exhaust gas treatment efficiency will be significantly reduced and cannot meet environmental emission standards. For example, in some chemical industries, trace heavy metal impurities contained in the exhaust gas will gradually deposit on the surface of the catalyst, occupying the active sites of the catalyst and reducing its activity. On the other hand, for exhaust gases with certain complex components, existing catalytic oxidation furnaces may not be able to completely oxidize the harmful substances therein, resulting in some pollutants remaining in the exhausted exhaust gas, posing a risk of secondary pollution. Secondly, the equipment has a high energy consumption, which is mainly reflected in the energy consumption required to heat the exhaust gas to the reaction temperature. This not only increases the operating costs of the enterprise, but also does not conform to the development trend of energy conservation and emission reduction.

[0004] Therefore, in view of this, the inventor, based on his many years of rich experience in design, development and actual production in the relevant industry, has studied and improved the existing structure and deficiencies, and provided a catalytic oxidation furnace for purifying exhaust gas, in order to achieve a more practical purpose. Summary of the invention

[0005] 1. In order to overcome the above-mentioned defects of the prior art, the embodiment of the present invention provides a method for purifying waste gas.

[0006] The catalytic oxidation furnace effectively removes impurities and poisons in the exhaust gas and reduces the risk of catalyst poisoning by setting up an activated carbon adsorption layer, a medium-efficiency filter and a primary-efficiency filter in the middle catalytic box and the pre-treatment unit. The use of the first flow equalizing plate and the second flow equalizing plate in this layered catalyst bed design optimizes the working environment of the catalyst and reduces the possibility of catalyst deactivation. The catalyst regeneration system can promptly restore the activity of the deactivated catalyst, further extend the service life of the catalyst, and reduce the frequency and cost of catalyst replacement for enterprises. The exhaust gas is deeply treated by coordinating with the secondary catalytic oxidation device and the exhaust gas washing tower to ensure the thorough removal of harmful substances in the exhaust gas, greatly improve the exhaust gas purification effect, and effectively avoid secondary pollution. At the same time, the catalyst regeneration system uses reducing gas to re-wash the catalyst inside the middle catalytic box to restore its activity, improve the catalytic effect of the equipment in the later stage, and further enhance the practicability of the device to solve the problems raised in the above-mentioned background technology.

[0007] To achieve the above-mentioned object, the present invention provides the following technical solutions: a catalytic oxidation furnace for purifying exhaust gas, comprising a catalytic furnace body, a middle catalytic box is provided in the middle of the catalytic furnace body, a pretreatment unit is provided on the right side of the middle catalytic box, an enhanced treatment unit is provided on the left side of the middle catalytic box, a first flow balancing plate, an upper catalyst, a second flow balancing plate and a lower catalyst are provided in the middle catalytic box from top to bottom for filtering and adsorption, and a catalyst regeneration system is provided on one side of the middle catalytic box;

[0008] The pretreatment unit includes an activated carbon adsorption layer, a medium-efficiency filter and a primary-efficiency filter connected from left to right between the middle catalytic box and the air inlet end of the catalytic furnace body;

[0009] The enhanced treatment unit includes a connecting pipe connected to the interior of the middle catalytic box, the other end of the connecting pipe is equipped with a secondary catalytic oxidation device, the output end of the secondary catalytic oxidation device is equipped with an exhaust pipe, and the other end of the exhaust pipe is connected to a tail gas washing tower filled with alkaline absorbent;

[0010] The catalyst regeneration system includes a storage tank storing reducing gas, which is heated up to re-flush the inside of the catalyst to restore its activity.

[0011] Preferably, the interior of the activated carbon adsorption layer has a rich microporous structure and stronger adsorption capacity, the interior of the medium-efficiency filter is folded filter paper or synthetic fiber filter material, and the primary filter is made of glass fiber filter paper or non-woven fabric and other materials.

[0012] Preferably, the first flow equalizing plate, the upper catalyst, the second flow equalizing plate and the lower catalyst are sequentially installed from top to bottom inside the middle catalyst box. The first flow equalizing plate and the second flow equalizing plate are used to evenly connect the exhaust gas with the interior of the upper catalyst and the second flow equalizing plate. The upper catalyst adopts a precious metal catalyst with high anti-poisoning performance, the lower catalyst adopts a transition metal oxide catalyst, and the internal catalyst of the secondary catalytic oxidation device is made of photocatalyst titanium dioxide.

[0013] Preferably, the catalyst regeneration system also includes a first multi-way valve, which is installed on a connecting pipe. The first multi-way valve and the storage tank are connected to each other through a fixed pipe. An input pipe is installed on one side of the storage tank, and a heating device with an air pump inside is installed on the other end of the input pipe. A circulation pipe is installed on the output end of the heating device.

[0014] Preferably, a second multi-way valve is installed at the other end of the circulation pipe, a delivery pipe is installed on the second multi-way valve, one end of the delivery pipe passes through the middle catalyst box and extends into the interior thereof, and the other end of the delivery pipe is connected to the interior of the activated carbon adsorption layer.

[0015] Preferably, an emission pipe is installed on the top of the tail gas washing tower, an emission concentration detector is provided on one side of the emission pipe, and the emission concentration detector is installed on the catalytic furnace body.

[0016] Preferably, a unit controller is installed on one side of the catalytic furnace body, and the unit controller is used to control internal electrical components. A guide plate is installed at the top opening of the middle catalytic box, and a plurality of guide ports are opened inside the guide plate to evenly distribute the exhaust gas intake. A sealed door for maintenance is provided on the left side of the catalytic furnace body.

[0017] Preferably, a heat exchanger is installed at the other end of the exhaust pipe, an air supply pipe is installed at one end of the heat exchanger, a third multi-way valve is installed on one side of the air supply pipe, the other end of the air supply pipe is through-connected to the interior of the exhaust gas washing tower, and a medium output pipe is installed at the output end of the heat exchanger.

[0018] Preferably, a circulation pipe is installed at the other output end of the secondary catalytic oxidation device, and a preheater with a fan inside is installed at the other end of the circulation pipe. The delivery pipe is arranged in a serpentine shape inside the preheater for preheating and heating. A return pipe is installed at the output end of the preheater, and the other end of the return pipe is connected to the interior of the third multi-way valve.

[0019] Preferably, the raw gas inside the storage tank is hydrogen, and the alkaline absorbent filled inside the tail gas scrubbing tower is sodium hydroxide solution.

[0020] Technical effects and advantages of the present invention:

[0021] 2. The present invention effectively removes impurities and poisons in the exhaust gas and reduces the risk of catalyst poisoning by setting the activated carbon adsorption layer, medium-efficiency filter and primary-efficiency filter inside the middle catalyst box and the pre-treatment unit. The use of the first flow equalizing plate and the second flow equalizing plate in the layered catalyst bed design optimizes the working environment of the catalyst and reduces the possibility of catalyst deactivation. The catalyst regeneration system can promptly restore the activity of the deactivated catalyst, further prolong the service life of the catalyst, and reduce the frequency and cost of catalyst replacement for enterprises;

[0022] 3. The present invention deeply treats the exhaust gas by coordinating the secondary catalytic oxidation device and the tail gas washing tower, ensuring the thorough removal of harmful substances in the exhaust gas, greatly improving the exhaust gas purification effect, and effectively avoiding secondary pollution. At the same time, through the catalyst regeneration system, the catalyst inside the middle catalyst box is re-washed with reducing gas to restore its activity, thereby improving the catalytic effect of the equipment in the later stage and facilitating long-term use;

[0023] 4. The present invention arranges a preheater so that the purified high-temperature gas is re-transported to the interior of the preheater through a circulation pipe, so that the exhaust gas transported in the delivery pipe is heated to a suitable reaction temperature, so that the exhaust gas is fully pretreated before entering the catalytic oxidation reaction, and can react efficiently under suitable conditions after entering the catalytic oxidation zone. The high-temperature gas generated after the catalysis is used in conjunction with a heat exchanger to exchange heat with the medium that needs heat exchange, thereby improving energy utilization efficiency and further saving energy costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the internal structure of the present invention;

[0025] Figure 2 It is a schematic diagram of the cross-sectional structure of the present invention;

[0026] Figure 3 It is a partial cross-sectional structural schematic diagram of the present invention;

[0027] Figure 4 It is a schematic diagram of the internal structure of the medium efficiency filter 4 of the present invention;

[0028] Figure 5 It is a schematic diagram of the three-dimensional structure of the present invention.

[0029] The accompanying drawings are marked as follows: 1. Catalytic furnace body; 2. Middle catalytic box; 3. Activated carbon adsorption layer; 4. Medium efficiency filter; 5. Primary efficiency filter; 6. First equalizing plate; 7. Upper catalyst; 8. Second equalizing plate; 9. Lower catalyst; 10. Connecting pipe; 101. Secondary catalytic oxidation device; 102. Exhaust pipe; 11. Tail gas washing tower; 12. Discharge pipe; 13. Storage tank; 14. Fixed pipe; 15. First multi-way valve; 16. Input pipe; 17. Heating device; 18. Circulation pipe; 19. Second multi-way valve; 20. Delivery pipe; 21. Emission concentration detector; 22. Unit controller; 23. Heat exchanger; 24. Medium output pipe; 25. Air supply pipe; 26. Third multi-way valve; 27. Circulation pipe; 28. Preheater; 29. ​​Reflux pipe; 30. Guide plate; 31. Guide port; 32. Sealing door. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0031] As attached Figure 1 To Attachment Figure 5 A catalytic oxidation furnace for purifying exhaust gas shown in the figure comprises a catalytic furnace body 1, a middle catalytic box 2 is arranged in the middle of the catalytic furnace body 1, a pretreatment unit is arranged on the right side of the middle catalytic box 2, and an enhanced treatment unit is arranged on the left side of the middle catalytic box 2. The interior of the middle catalytic box 2 is provided with a first flow balancing plate 6, an upper catalyst 7, a second flow balancing plate 8 and a lower catalyst 9 from top to bottom for filtering and adsorption, a catalyst regeneration system is arranged on one side of the middle catalytic box 2, and the pretreatment unit comprises an activated carbon adsorption layer connected from left to right between the middle catalytic box 2 and the air inlet end of the catalytic furnace body 1 3 and medium-efficiency filter 4 and primary filter 5, through the middle catalytic box 2 and the internal activated carbon adsorption layer 3 of the pretreatment unit and the medium-efficiency filter 4 and primary filter 5, impurities and poisons in the exhaust gas are effectively removed to reduce the risk of catalyst poisoning. The use of the first flow equalizing plate 6 and the second flow equalizing plate 8 in this layered catalyst bed design optimizes the working environment of the catalyst and reduces the possibility of catalyst deactivation. The catalyst regeneration system can promptly restore the activity of the deactivated catalyst, further prolong the service life of the catalyst, and reduce the frequency and cost of catalyst replacement by the enterprise;

[0032] The catalyst regeneration system includes a storage tank 13 storing reducing gas to increase the temperature and re-flush the inside of the catalyst to restore its activity. The regeneration system is used to remove the catalyst poisoning impurities inside the catalyst box 2;

[0033] The enhanced treatment unit includes a connecting pipe 10 connected to the inside of the middle catalytic box 2, a secondary catalytic oxidation device 101 is installed at the other end of the connecting pipe 10, an exhaust pipe 102 is installed at the output end of the secondary catalytic oxidation device 101, and the other end of the exhaust pipe 102 is connected to a tail gas washing tower 11 filled with an alkaline absorbent. The internal catalyst of the secondary catalytic oxidation device 101 is made of photocatalyst titanium dioxide, so that under ultraviolet irradiation, trace harmful substances that may remain after the initial catalytic oxidation are further oxidized and decomposed, ensuring that the exhaust gas emissions meet more stringent environmental protection standards and completely eliminating the risk of secondary pollution. At the same time, the tail gas washing tower 11 is used to absorb acidic gases such as sulfur dioxide and nitrogen oxides that may remain in the exhaust gas;

[0034] Secondly, the interior of the activated carbon adsorption layer 3 has a rich microporous structure. Through the rich microporous structure, it can effectively adsorb organic poisons in the exhaust gas, such as volatile organic compounds such as benzene, toluene, and xylene, acidic gases such as sulfur dioxide, nitrogen oxides, and alkaline gases such as ammonia, etc., reduce the concentration of harmful substances in the exhaust gas, reduce the toxic effect on subsequent catalysts, and have stronger adsorption. The interior of the medium-efficiency filter 4 is a folded filter paper or a synthetic fiber filter material. The folded filter paper or the synthetic fiber filter material is used to further filter smaller particle impurities. The primary filter 5 is made of glass fiber filter paper or non-woven fabrics and other materials to remove large particles of dust, particulate matter and other impurities in the exhaust gas.

[0035] Secondly, the first flow balancing plate 6, the upper catalyst 7, the second flow balancing plate 8 and the lower catalyst 9 are sequentially installed from top to bottom inside the middle catalyst box 2. The first flow balancing plate 6 and the second flow balancing plate 8 are used to evenly connect the exhaust gas with the upper catalyst 7 and the second flow balancing plate 8. The flow balancing plate allows the pre-treated exhaust gas to evenly enter the catalytic oxidation zone, ensuring uniform reaction everywhere in the catalyst bed and improving the exhaust gas treatment efficiency. The upper catalyst 7 uses a noble metal catalyst with high anti-poisoning performance, and its active components are loaded on a high temperature resistant alumina or zeolite carrier, which can effectively resist the interference of poisons that may exist in the exhaust gas, and at the same time has good catalytic activity for low concentrations of harmful substances. The lower catalyst 9 uses a transition metal oxide catalyst, which has a relatively low cost and has a high catalytic activity for some specific harmful substances such as some difficult-to-oxidize organic compounds. The two layers of catalysts work synergistically to improve the oxidation effect of various harmful substances in the exhaust gas.

[0036] Secondly, the catalyst regeneration system also includes a first multi-way valve 15, which is installed on the connecting pipe 10. The first multi-way valve 15 and the storage tank 13 are connected to each other through a fixed pipe 14. An input pipe 16 is installed on one side of the storage tank 13, and a heating device 17 with an air pump inside is installed on the other end of the input pipe 16. A circulation pipe 18 is installed on the output end of the heating device 17. The internal gas of the storage tank 13 is transported to the inside through the input pipe 16 by the heating device 17 for heating to a temperature of 300-500°C, and then the reducing gas is circulated in the catalyst bed inside the middle catalyst box 2 through the circulation pipe 18, the second multi-way valve 19 and the fixed pipe 14, and a reduction reaction occurs with the poison on the surface of the deactivated catalyst to remove the poison and restore the activity of the catalyst. The regeneration process can be carried out without stopping the operation of the equipment, reducing the impact on production;

[0037] At the same time, a second multi-way valve 19 is installed at the other end of the circulation pipe 18, and a delivery pipe 20 is installed on the second multi-way valve 19. One end of the delivery pipe 20 passes through the middle catalytic box 2 and extends into the interior thereof, and the other end of the delivery pipe 20 is connected to the interior of the activated carbon adsorption layer 3. The heated gas is delivered to the middle catalytic box 2 through the circulation pipe 18 and the second multi-way valve 19, and the purified gas is re-delivered to the interior of the storage tank 13 through the bottom connecting pipe 10, the first multi-way valve 15 and the fixed pipe 14.

[0038] An exhaust pipe 12 is installed on the top of the exhaust washing tower 11, and an emission concentration detector 21 is provided on one side of the exhaust pipe 12. The emission concentration detector 21 is installed on the catalytic furnace body 1. The pollutant emission concentration detector 21 is set on the exhaust gas emission pipe 12 to monitor the pollutant concentration in the exhaust gas in real time. If it is found that the emission exceeds the standard, an alarm is issued in time and the equipment operation parameters are adjusted to ensure that the exhaust gas is stably discharged and meets the standard.

[0039] A unit controller 22 is installed on one side of the catalytic furnace body 1. The unit controller 22 is used to control the internal electrical components. A guide plate 30 is installed at the top opening of the middle catalytic box 2. The guide plate 30 is provided with a plurality of guide ports 31 for evenly distributing the exhaust gas intake. A sealed door 32 for maintenance is provided on the left side of the catalytic furnace body 1. The unit controller 22 is used for the stable operation of the internal components, such as real-time control of the exhaust gas inside the delivery pipe 20 to reach a preset temperature and enter the middle catalytic box 2.

[0040] Secondly, a heat exchanger 23 is installed at the other end of the discharge pipe 102, an air supply pipe 25 is installed at one end of the heat exchanger 23, a third multi-way valve 26 is installed on one side of the air supply pipe 25, the other end of the air supply pipe 25 is connected to the inside of the tail gas washing tower 11, and a medium output pipe 24 is installed at the output end of the heat exchanger 23. The heat exchanger 23 exchanges heat between the output high-temperature purified gas and the external medium that needs to be heated, thereby improving the utilization rate of energy, and at the same time, the temperature is reduced to a suitable standard before being discharged, and finally purified again through the tail gas washing tower 11.

[0041] Secondly, a circulation pipe 27 is installed at the other output end of the secondary catalytic oxidation device 101, and a preheater 28 with a fan inside is installed at the other end of the circulation pipe 27. The delivery pipe 20 is arranged in a serpentine shape inside the preheater 28 for preheating and heating. A return pipe 29 is installed at the output end of the preheater 28, and the other end of the return pipe 29 is connected to the inside of the third multi-way valve 26. The preheating and cooling degrees are adjusted in real time according to the exhaust gas temperature. The delivery pipe 20 for transporting the exhaust gas inside is preheated to a suitable temperature by transporting the purified gas to the preheater 28, so that the temperature of the exhaust gas entering the catalytic oxidation zone is stabilized within the optimal reaction temperature range.

[0042] The original gas inside the storage tank 13 is hydrogen, and the activity of the catalyst inside the middle catalytic box 2 is restored by hydrogen. The alkaline absorbent filled in the exhaust gas washing tower 11 is sodium hydroxide solution. The purified exhaust gas is transported to the exhaust gas washing tower 11 to fully contact with the sodium hydroxide solution to absorb the acidic gas that may remain in the exhaust gas.

[0043] Working principle of the present invention: The present invention is mainly divided into the following steps in actual operation:

[0044] In the exhaust gas pretreatment stage, the exhaust gas first enters the pretreatment unit, and passes through the primary filter 5, the medium filter 4 and the activated carbon adsorption layer 3 in sequence. The primary filter 5 uses glass fiber filter paper or non-woven fabric and other materials to remove large dust particles, particulate matter and other impurities in the exhaust gas; the interior of the medium filter 4 is a folded filter paper or synthetic fiber filter material to further filter smaller particle impurities; the activated carbon adsorption layer 3, with its rich microporous structure, adsorbs organic poisons such as benzene, toluene, xylene and other volatile organic matter, acidic gases such as sulfur dioxide, nitrogen oxides and alkaline gases such as ammonia in the exhaust gas, reduces the concentration of harmful substances in the exhaust gas, and reduces the poisoning effect on the subsequent catalyst. The exhaust gas after pretreatment enters the middle catalyst box 2 through the guide port 31 of the guide plate 30;

[0045] In the catalytic oxidation stage, the exhaust gas entering the middle catalytic box 2 first passes through the first flow equalizing plate 6 to make the exhaust gas evenly distributed before contacting with the upper catalyst 7. The upper catalyst 7 uses a precious metal catalyst active component with high anti-poisoning performance loaded on a high-temperature resistant alumina or zeolite carrier, which can effectively resist the interference of poisons and has good catalytic activity for low-concentration harmful substances. The incompletely reacted exhaust gas is then evenly distributed through the second flow equalizing plate 8 and then acts on the lower catalyst 9. The lower catalyst 9 uses a transition metal oxide catalyst and has a high catalytic activity for some specific harmful substances. The two layers of catalysts 79 synergistically improve the oxidation effect on a variety of harmful substances. During the catalytic oxidation process, the unit controller 22 can control related operations according to preset parameters to ensure the stable reaction.

[0046] In the enhanced treatment stage, the gas after catalytic oxidation in the middle catalytic box 2 enters the secondary catalytic oxidation device 101 through the connecting pipe 10. The photocatalyst titanium dioxide inside the secondary catalytic oxidation device 101 further oxidizes and decomposes the possible residual trace harmful substances under ultraviolet irradiation. Then the gas enters the heat exchanger 23 through the discharge pipe 102, exchanges heat with the external medium that needs to be heated, realizes energy recovery and utilization, and the gas temperature is reduced. After that, the gas enters the tail gas washing tower 11 through the air supply pipe 25 and the third multi-way valve 26. The sodium hydroxide solution filled in the tail gas washing tower 11 absorbs the residual acidic gases in the exhaust gas such as sulfur dioxide, nitrogen oxides, etc.;

[0047] The catalyst regeneration stage is carried out on demand. When the catalyst needs to be regenerated, the hydrogen in the storage tank 13 is transported to the heating device 17 through the input pipe 16 and heated to 300-500°C under the action of the air pump provided inside the heating device 17. Then, it enters the catalyst bed inside the middle catalyst box 2 through the circulation pipe 18, the second multi-way valve 19 and the fixed pipe 14. The hydrogen circulates under the action of the fan and reacts with the poison on the surface of the deactivated catalyst to remove the poison and restore the activity of the catalyst. The purified gas is re-transported to the storage tank 13 through the bottom connecting pipe 10, the first multi-way valve 15 and the fixed pipe 14. At the same time, during the whole process, the emission concentration detector 21 monitors the pollutant concentration in the exhaust emission pipeline 12 in real time. If it exceeds the standard, it will alarm and prompt the adjustment of the equipment operation parameters to ensure that the exhaust gas is stably discharged and meets the standard.

[0048] Finally, a few points should be explained: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, which may refer to mechanical connection or electrical connection, or internal communication between two components, or direct connection. "upper", "lower", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may change;

[0049] Secondly: In the drawings of the embodiments disclosed in the present invention, only the structures related to the embodiments disclosed in the present invention are involved, and other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of the present invention can be combined with each other;

[0050] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A catalytic oxidation furnace for purifying exhaust gas, comprising a catalytic furnace body (1), characterized in that: A middle catalytic box (2) is provided in the middle of the catalytic furnace body (1), a pretreatment unit is provided on the right side of the middle catalytic box (2), and a strengthening treatment unit is provided on the left side of the middle catalytic box (2). The interior of the middle catalytic box (2) is provided with a first flow balancing plate (6), an upper catalyst (7), a second flow balancing plate (8) and a lower catalyst (9) from top to bottom for filtering and adsorption, and a catalyst regeneration system is provided on one side of the middle catalytic box (2); The pretreatment unit comprises an activated carbon adsorption layer (3), a medium-efficiency filter (4) and a primary-efficiency filter (5) connected sequentially from left to right between the middle catalyst box (2) and the air inlet end of the catalyst furnace body (1); The enhanced treatment unit comprises a connecting pipe (10) which is connected to the inside of the middle catalytic box (2); a secondary catalytic oxidation device (101) is installed at the other end of the connecting pipe (10); an exhaust pipe (102) is installed at the output end of the secondary catalytic oxidation device (101); and the other end of the exhaust pipe (102) is connected to a tail gas scrubber (11) filled with an alkaline absorbent; The catalyst regeneration system comprises a storage tank (13) storing reducing gas, which is heated to re-flush the inside of the catalyst to restore its activity.

2. A catalytic oxidation furnace for purifying exhaust gas according to claim 1, characterized in that: The interior of the activated carbon adsorption layer (3) has a rich microporous structure and stronger adsorption capacity. The interior of the medium-efficiency filter (4) is made of folded filter paper or synthetic fiber filter material. The primary filter (5) is made of glass fiber filter paper or non-woven fabric and other materials.

3. A catalytic oxidation furnace for purifying exhaust gas according to claim 1, characterized in that: The first flow equalizing plate (6), the upper catalyst (7), the second flow equalizing plate (8) and the lower catalyst (9) are sequentially installed from top to bottom inside the middle catalyst box (2); the first flow equalizing plate (6) and the second flow equalizing plate (8) are used to evenly connect the exhaust gas with the upper catalyst (7) and the interior of the second flow equalizing plate (8); the upper catalyst (7) uses a precious metal catalyst with high anti-poisoning performance; the lower catalyst (9) uses a transition metal oxide catalyst; and the internal catalyst of the secondary catalytic oxidation device (101) is made of a photocatalyst titanium dioxide.

4. A catalytic oxidation furnace for purifying exhaust gas according to claim 1, characterized in that: The catalyst regeneration system further comprises a first multi-way valve (15), the first multi-way valve (15) being mounted on the connecting pipe (10), the first multi-way valve (15) and the storage tank (13) being connected to each other via a fixed pipe (14), an input pipe (16) being mounted on one side of the storage tank (13), a heating device (17) having an air pump disposed therein being mounted on the other end of the input pipe (16), and a circulation pipe (18) being mounted on the output end of the heating device (17).

5. A catalytic oxidation furnace for purifying exhaust gas according to claim 4, characterized in that: A second multi-way valve (19) is installed at the other end of the circulation pipe (18), and a delivery pipe (20) is installed on the second multi-way valve (19). One end of the delivery pipe (20) passes through the middle catalyst box (2) and extends into the interior thereof, and the other end of the delivery pipe (20) is connected to the interior of the activated carbon adsorption layer (3).

6. A catalytic oxidation furnace for purifying exhaust gas according to claim 1, characterized in that: An exhaust pipe (12) is installed on the top of the exhaust gas washing tower (11), and an exhaust concentration detector (21) is provided on one side of the exhaust pipe (12). The exhaust concentration detector (21) is installed on the catalytic furnace body (1).

7. A catalytic oxidation furnace for purifying exhaust gas according to claims 1-6, characterized in that: A unit controller (22) is installed on one side of the catalytic furnace body (1), and the unit controller (22) is used to control internal electrical components. A guide plate (30) is installed at the top opening of the middle catalytic box (2), and a plurality of guide ports (31) are opened inside the guide plate (30) for evenly distributing the exhaust gas intake. A sealed door (32) for maintenance is provided on the left side of the catalytic furnace body (1).

8. The catalytic oxidation furnace for purifying exhaust gas according to claim 1, characterized in that: A heat exchanger (23) is installed at the other end of the discharge pipe (102), an air supply pipe (25) is installed at one end of the heat exchanger (23), a third multi-way valve (26) is installed on one side of the air supply pipe (25), the other end of the air supply pipe (25) is connected to the inside of the tail gas washing tower (11), and a medium output pipe (24) is installed at the output end of the heat exchanger (23).

9. A catalytic oxidation furnace for purifying exhaust gas according to claim 8, characterized in that: A circulation pipe (27) is installed at the other output end of the secondary catalytic oxidation device (101), and a preheater (28) with a fan inside is installed at the other end of the circulation pipe (27). The delivery pipe (20) is arranged in a serpentine shape inside the preheater (28) for preheating and temperature raising. A return pipe (29) is installed at the output end of the preheater (28), and the other end of the return pipe (29) is connected to the inside of the third multi-way valve (26).

10. A catalytic oxidation furnace for purifying exhaust gas according to claim 6, characterized in that: The raw gas inside the storage tank (13) is hydrogen, and the alkaline absorbent filled inside the tail gas washing tower (11) is sodium hydroxide solution.

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