Electric heating type heat accumulating type catalytic furnace
By designing an electric-thermal regenerative catalytic furnace, using purge and heating technology, the problem of the RCO furnace being discharged without combustion during pipeline switching is solved, and efficient treatment of waste gas and reduction of emission indicators is achieved.
Patent Information
- Application Number
- CN202510327498.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-19
- Publication Date
- 2025-05-13
AI Technical Summary
During the pipeline switching process of the RCO furnace, the exhaust gas in the heat storage chamber near the inlet of the to-be-treated exhaust gas is directly discharged without combustion, affecting the emission indicators.
An electric-thermal heat storage catalytic furnace is designed, including an upper air duct layer, a lower air duct layer, an upper heat storage layer, an upper catalytic layer, a heat replenishment layer, a lower catalytic layer and a lower heat storage layer. The purge and heating of exhaust gas is achieved through the purge pipe and the conveying pipe to ensure that the exhaust gas is fully burned in the catalytic layer.
It effectively avoids uncombustible exhaust gas emissions during pipeline switching, ensures continuous treatment efficiency of exhaust gas, reduces the impact of emission indicators, and has a compact structure and small space.
Smart Images
Figure CN119983296A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of RCO waste gas treatment, and in particular to an electric heating type heat storage catalytic furnace. Background Art
[0002] RCO (Regenerative Catalytic Oxidation) technology is a highly efficient waste gas treatment technology, which is widely used to treat medium and high concentrations of volatile organic compounds (VOCs). This technology combines the advantages of regenerative thermal oxidation (RTO) and catalytic combustion (CO), reduces the reaction temperature through the catalyst, and achieves efficient and energy-saving waste gas treatment.
[0003] The working principle of RCO technology is as follows: the exhaust gas first passes through pre-treatment equipment (such as filters) to remove dust and other particulate matter to prevent impurities from entering the subsequent system; the pre-treated exhaust gas enters a heat storage chamber for preheating and absorbs heat in the heat storage chamber; the preheated exhaust gas enters the catalytic layer and undergoes an oxidation reaction at a lower temperature (usually 200°C to 400°C) to be converted into carbon dioxide and water vapor; the high-temperature gas after the reaction passes through another heat storage chamber, transfers heat to the ceramic material in the heat storage chamber, and then is discharged; by switching the valve, the inlet and outlet directions are changed, so that the untreated exhaust gas and the treated high-temperature gas alternately pass through different heat storage chambers to achieve heat recovery and utilization.
[0004] When the RCO furnace switches the pipeline, the exhaust gas in the heat storage chamber close to the inlet of the exhaust gas to be treated will be discharged directly without being burned, resulting in the discharge of a portion of unburned gas each time the switch is made, affecting the emission indicators. Summary of the invention
[0005] In order to reduce the impact of the pipeline switching process on emission indicators, the present application provides an electric heating type heat storage catalytic furnace.
[0006] The present application provides an electric heating type heat storage catalytic furnace adopts the following technical solution: An electric heating type heat storage catalytic furnace comprises a furnace body, wherein an upper air duct layer and a lower air duct layer are arranged in the furnace body, an upper heat storage layer, an upper catalytic layer, a heat supplement layer, a lower catalytic layer and a lower heat storage layer are arranged in sequence between the upper air duct layer and the lower air duct layer, an air inlet and an air outlet are arranged in the upper air duct layer and the lower air duct layer, an air inlet cavity connected with two air inlets and an air outlet cavity connected with two air outlets are arranged in the furnace body, an input port connected with the air inlet cavity and an output port connected with the air outlet cavity are arranged on the furnace body, and a first fan is arranged at the input port and the output port; The first switching assembly is provided with two groups, which are respectively located in the air inlet cavity and the air outlet cavity, and are used to control the opening and closing of the air inlet or the air outlet, so that the air inlet of the upper air duct layer and the air outlet of the lower air duct layer are opened at the same time, or the air inlet of the lower air duct layer and the air outlet of the upper air duct layer are opened at the same time; A purge pipe is arranged on the furnace body, one end of the purge pipe is connected to the air inlet cavity, and the other end of the purge pipe is connected to the air supply source; A delivery pipe is arranged on the furnace body, one end of the delivery pipe is provided with a valve body and is connected with the air inlet cavity, the other end of the delivery pipe is located in the supplementary heating layer, and one end of the delivery pipe located in the supplementary heating layer is provided with a discharge port; The second switching component is arranged in the air intake cavity, and includes a first linear driving member and a branch pipe. The branch pipe is arranged at the movable end of the first linear driving member. When one end of the branch pipe is connected to the input port, the other end of the branch pipe is connected to the delivery pipe, so that the untreated exhaust gas entering the air intake cavity can flow into the heating supplement layer through the delivery pipe.
[0007] By adopting the above technical scheme, on the one hand, air can be blown into the corresponding air duct layer, and the waste gas that has not been burned inside can be blown into the subsequent part for combustion, so as to avoid affecting the subsequent emission indicators; on the other hand, while blowing, new waste gas can continuously flow into the supplementary heat layer, and the new waste gas is heated and then burned in the catalytic layer, so this part of the waste gas can also be treated, and the waste gas can be continuously treated, which helps to ensure the treatment efficiency of the waste gas; in addition, while the purge process is in progress, the waste gas can be continuously introduced and burned. During the purge process, the new waste gas introduced into the furnace body is not easy to flow into the purge area, that is, the introduced new waste gas will not affect the purge process, which helps to ensure the purge effect, thereby avoiding the instantaneous emission value of the waste gas exceeding the standard; in addition, since the upper heat storage layer, the upper catalytic layer, the supplementary heat layer, the lower catalytic layer and the lower heat storage layer are stacked in the vertical direction, the overall structure is more compact and occupies less space.
[0008] Optionally, the first switching component includes a second linear drive member and a baffle, the second linear drive member is arranged on the furnace body, the baffle is arranged at the movable end of the second linear drive member, the baffle is located in the air inlet cavity or the air outlet cavity, and the baffle is used to block the air inlet or the air outlet.
[0009] By adopting the above technical solution, one driving member can realize the switching of the air inlet and the air outlet states, and the structure is simple, stable and reliable.
[0010] Optionally, the conveying pipe includes a connecting portion, a curved portion and a straight portion, the curved portion and the straight portion are both located in the heat supplement layer, the connecting portion is communicated with the air inlet cavity, the curved portion is connected between the connecting portion and the straight portion, the discharge port is arranged on the straight portion, and there are multiple discharge ports arranged at intervals.
[0011] By adopting the above technical solution, the setting of the curved portion extends the flow path of the exhaust gas, so that during the purge process, the newly flowing exhaust gas can be more fully heated in the heating layer, so that the subsequent exhaust gas can be more fully burned, thereby ensuring the exhaust gas treatment effect.
[0012] Optionally, a plurality of straight line portions are provided and are evenly spaced apart.
[0013] By adopting the above technical solution, the exhaust gas can be discharged more evenly, avoiding the situation where uneven exhaust gas concentration in various parts of the heating layer causes local overheating of the catalyst layer, which is conducive to the normal operation of the catalyst layer.
[0014] Optionally, a connecting pipe connected to the discharge port is provided on the straight portion, and the connecting pipe and the discharge port are rotatably connected. A turntable is fixedly provided on the connecting pipe, and a cavity connected to the connecting pipe is provided inside the turntable. An exhaust port is provided on the circumferential side of the turntable along its own tangential direction, and the exhaust port is connected to the cavity inside the turntable.
[0015] By adopting the above technical scheme, the exhaust gas in the straight part can enter the turntable through the connecting pipe, and then be discharged through the exhaust port on the turntable, so that the turntable can rotate, and the exhaust gas inside can be discharged while rotating. On the one hand, the unburned exhaust gas in the supplementary heating layer and the exhaust gas that has been burned can be mixed, and the gas concentration is more uniform, so that the subsequent combustion is more complete. On the other hand, it can prevent the exhaust gas in the turntable from flowing directly into the subsequent catalytic layer, and the residence time of the untreated exhaust gas in the supplementary heating layer can be extended, so that this part of the exhaust gas can be more fully heated, thereby ensuring the subsequent catalytic combustion effect; in addition, the gas flow rate can be slowed down when the gas in the supplementary heating layer is mixed, so that the gas in the supplementary heating layer can have more sufficient time for catalytic combustion in the subsequent catalytic layer, which helps to ensure the combustion effect.
[0016] Optionally, the turntable is provided with fan blades, and the fan blades are provided in plurality and arranged in a circular array.
[0017] The adoption of the above technical solution helps to enhance the gas mixing effect in the heating layer.
[0018] Optionally, one end of the purge pipe away from the air inlet cavity is connected to the output port, and a three-way valve is provided between the purge pipe and the output port.
[0019] By adopting the above technical solution, the wind used for blowing is hot air, which can realize heat recovery and utilization.
[0020] Optionally, a heat exchange element is provided between the purge pipe and the delivery pipe.
[0021] By adopting the above technical solution, the burned gas in the purge pipe can exchange heat with the newly flowing exhaust gas in the delivery pipe, and the newly flowing exhaust gas can be preheated, so that the exhaust gas in the delivery pipe can be burned more fully in the subsequent process; the heat exchange component can recover the heat in the exhaust gas, which helps to improve the utilization rate of energy.
[0022] Optionally, a valve and a second fan are provided on the delivery pipe.
[0023] By adopting the above technical solution, when the catalytic furnace is just turned on, the fan starts to accelerate the air flow inside the furnace body, which helps to accelerate the heating rate inside the furnace body; after the catalytic furnace is shut down, the fan can be turned on again to introduce fresh air, which helps to accelerate the cooling of the catalytic furnace.
[0024] Optionally, a heat-insulating layer is provided in the furnace body, and the heat-insulating layer is arranged around the outer sides of the upper heat storage layer, the upper catalytic layer, the heat supplement layer, the lower catalytic layer and the lower heat storage layer.
[0025] By adopting the above technical solution, the heat preservation effect inside the furnace body can be enhanced, thereby reducing the heat dissipated to the outside, which helps to reduce energy consumption.
[0026] In summary, this application includes the following beneficial technical effects: 1. Before the exhaust gas flow direction is switched, the residual exhaust gas in the air duct layer originally close to the exhaust gas inlet side can be purged, and this part of the residual exhaust gas can be blown into the subsequent part for combustion treatment; while the purging process is in progress, new exhaust gas can be continuously introduced, and the new exhaust gas flows into the supplementary heating layer through the branch pipe and the conveying pipe, and is burned in the subsequent catalytic layer after heating; during the purging process, new exhaust gas can be introduced into the furnace body at the same time, so the purging process is not easy to affect the exhaust gas introduction process, which helps to ensure the continuous treatment efficiency of the exhaust gas; the newly introduced exhaust gas is not easy to flow into the purging area, so the exhaust gas introduction process is not easy to affect the purging process, which helps to ensure the purging effect.
[0027] 2. The exhaust gas in the conveying pipe can flow into the turntable through the connecting pipe, and then be discharged into the supplementary heating layer through the exhaust port on the turntable. The turntable exhausts air while rotating, so that the gas in the supplementary heating layer can be mixed and the gas distribution is more even, which is conducive to subsequent full combustion. In addition, it can also slow down the gas flow rate in the supplementary heating layer and prolong the residence time of the exhaust gas in the supplementary heating layer, so as to better heat the exhaust gas.
[0028] 3. The combustion-treated gas refluxed in the purge pipe and the new exhaust gas in the delivery pipe can exchange heat, heating the new exhaust gas in the delivery pipe so that this part of the newly introduced exhaust gas can be more fully burned later. BRIEF DESCRIPTION OF THE DRAWINGS
[0029] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application; Figure 2 is a cross-sectional view of the branch pipes in the embodiment of the present application in a staggered arrangement with the input port and the delivery pipe; Figure 3 is a cross-sectional view of a branch pipe in an embodiment of the present application in a state of being connected with an input port and a delivery pipe respectively; Figure 4 yes Figure 3 The enlarged schematic diagram of point A in the middle; Figure 5 This is a schematic diagram of the structure of the delivery pipe used to illustrate the embodiment of the present application; Figure 6 yes Figure 3 A magnified schematic diagram of point B in the middle.
[0030] Figure numerals: 1, furnace body; 11, upper air duct layer; 12, lower air duct layer; 13, upper heat storage layer; 14, upper catalytic layer; 15, supplementary heat layer; 151, heating wire; 16, lower catalytic layer; 17, lower heat storage layer; 2, air inlet; 3, air outlet; 4, air inlet cavity; 41, input port; 5, air outlet cavity; 51, output port; 6, first fan; 7, first switching assembly; 71, second linear drive member; 72, baffle; 8, Purge pipe; 9, delivery pipe; 91, connection part; 92, bend part; 93, straight part; 931, discharge port; 10, second switching assembly; 101, first linear drive member; 102, branch pipe; 18, connecting pipe; 19, turntable; 191, exhaust port; 192, fan blade; 20, valve body; 21, three-way valve; 22, heat exchange member; 23, insulation layer; 24, air inlet pipe; 241, valve; 242, second fan. DETAILED DESCRIPTION
[0031] The following combination Figure 1-Figure 6 This application is described in further detail.
[0032] The present application discloses an electric heating type heat storage catalytic furnace. Figure 1 and Figure 2The electric heating type heat storage catalytic furnace includes a furnace body 1, an upper air duct layer 11 is arranged on the top of the furnace body 1, and a lower air duct layer 12 is arranged on the bottom of the furnace body 1. Both the upper air duct layer 11 and the lower air duct layer 12 can be used for exhaust gas to flow. An upper heat storage layer 13, an upper catalytic layer 14, a supplementary heat layer 15, a lower catalytic layer 16 and a lower heat storage layer 17 are arranged in sequence from top to bottom between the upper air duct layer 11 and the lower air duct layer 12 in the furnace body 1. The upper heat storage layer 13 and the lower heat storage layer 17 are both honeycomb ceramic carriers; the upper catalytic layer 14 and the lower catalytic layer 16 are also honeycomb ceramic carrier structures, and a catalyst is arranged inside. The catalyst can be a precious metal catalyst or a metal oxide catalyst, which is used to reduce the activation energy of the reaction so that the exhaust gas can undergo a catalytic combustion reaction at 200-400°C. A heating wire 151 is arranged in the supplementary heat layer 15, which is used to heat the inside of the furnace body 1 so that the exhaust gas reaches the required temperature for the combustion reaction.
[0033] Reference Figure 2 The lower heat storage layer 17 is laid on one side near the bottom of the furnace body 1, the lower catalytic layer 16 is laid on the upper part of the lower heat storage layer 17, the supplementary heat layer 15 is located above the lower catalytic layer 16, a support grid is arranged above the supplementary heat layer 15, the support grid is fixedly connected to the side wall of the furnace body 1, the upper catalytic layer 14 is laid on the support grid, and the upper heat storage layer 13 is laid on the upper catalytic layer 14. Therefore, the support grid can support the upper catalytic layer 14 and the upper heat storage layer 13, thereby ensuring the normal operation of the heating wire 151 in the supplementary heat layer 15.
[0034] The furnace body 1 is also provided with a heat-insulating layer 23, which surrounds the outer sides of the upper heat storage layer 13, the upper catalytic layer 14, the heat supplement layer 15, the lower catalytic layer 16 and the lower heat storage layer 17, thereby enhancing the heat-insulating effect of the furnace body 1 and helping to reduce energy consumption.
[0035] An air inlet 2 and an air outlet 3 are provided on the side where the upper air duct layer 11 and the lower air duct layer 12 are close to each other. An air inlet cavity 4 and an air outlet cavity 5 are provided in the furnace body 1, and the air inlet cavity 4 and the air outlet cavity 5 are separated. The air inlet cavity 4 is connected with the upper and lower air inlets 2 at the same time, and the air outlet cavity 5 is connected with the upper and lower air outlets 3 at the same time. An input port 41 is provided on the furnace body 1, and the input port 41 is connected with the air inlet cavity 4. A first fan 6 is provided at the input port 41, and untreated exhaust gas can flow into the air inlet cavity 4 through the input port 41; an output port 51 is also provided on the furnace body 1, and the output port 51 is connected with the air outlet cavity 5. A first fan 6 is also provided at the output port 51, and the gas in the air outlet cavity 5 that has been treated by catalytic combustion can be discharged to the outside atmosphere through the output port 51.
[0036] The furnace body 1 is provided with a first switching assembly 7, and the first switching assembly 7 is provided with two groups, one of which is located in the air inlet cavity 4, and the other is located in the air outlet cavity 5. The first switching assembly 7 includes a second linear drive member 71 and a baffle 72. The second linear drive member 71 is fixedly provided on the furnace body 1. The second linear drive member 71 is an electric push rod. In other embodiments, the second linear drive member 71 can also be a cylinder or an oil cylinder. The baffle 72 is fixedly connected to the movable end of the second linear drive member 71, so that the baffle 72 can slide in the vertical direction. Taking the first switching component 7 in the air inlet chamber 4 as an example, when the baffle 72 blocks the air inlet 2 below the air inlet chamber 4, the air inlet 2 above the air inlet chamber 4 is in an open state, so the exhaust gas flowing into the air inlet chamber 4 through the input port 41 can flow into the upper air duct layer 11 through the upper air inlet 2; conversely, when the baffle 72 blocks the air inlet 2 above the air inlet chamber 4, the air inlet 2 below the air inlet chamber 4 is in an open state, so the exhaust gas flowing into the air inlet chamber 4 through the input port 41 can flow into the lower air duct layer 12 through the lower air inlet 2. Therefore, the switching of the exhaust gas flow direction in the furnace body 1 can be achieved by controlling the action of the second linear drive member 71.
[0037] It should be noted that the air inlet 2 and the air outlet 3 of the upper air duct layer 11 are not opened at the same time, and the air inlet 2 and the air outlet 3 of the lower air duct layer 12 are not opened at the same time. When the air inlet 2 of the upper air duct layer 11 is opened, the air outlet 3 of the lower air duct layer 12 is in an open state, and the exhaust gas in the furnace body 1 flows from top to bottom; when the air inlet 2 of the lower air duct layer 12 is opened, the air outlet 3 of the upper air duct layer 11 is in an open state, and the exhaust gas in the furnace body 1 flows from bottom to top.
[0038] Reference Figure 1 and Figure 2 When the exhaust gas flow direction is switched, some unburned exhaust gas will remain in the upper air duct layer 11 or the lower air duct layer 12. In order to facilitate the treatment of the remaining unburned exhaust gas and avoid the instantaneous emission concentration exceeding the standard, a purge pipe 8 is provided on the furnace body 1. One end of the purge pipe 8 is connected to the output port 51, and the other end of the purge pipe 8 is connected to the air inlet cavity 4; a three-way valve 21 is provided at the connection between the purge pipe 8 and the output port 51. Therefore, when the exhaust gas in the furnace body 1 is burned, the exhaust gas in the air outlet chamber 5 can be discharged into the outside atmosphere through the output port 51; when it is necessary to switch the exhaust gas flow direction, the state of the three-way valve 21 can be changed first, so that the burned gas in the air outlet chamber 5 can flow into the air inlet chamber 4 through the purge pipe 8, and this part of the gas then flows into the upper air duct layer 11 or the lower air duct layer 12 through the air inlet 2, and the unburned exhaust gas inside is blown into the corresponding heat storage layer, thereby achieving the purge of the air duct layer; after the purge is completed, the exhaust gas flow direction in the furnace body 1 can be switched.
[0039] In order to ensure that untreated exhaust gas can be continuously introduced into the furnace body 1 for combustion treatment during the purging process and to ensure continuous treatment of the exhaust gas, a delivery pipe 9 is also provided on the furnace body 1. One end of the delivery pipe 9 is connected to the air inlet chamber 4, and a valve body 20 is provided at the connection between the delivery pipe 9 and the air inlet chamber 4; the other end of the delivery pipe 9 is located in the supplementary heat layer 15, and a discharge port 931 is provided in the portion of the delivery pipe 9 located in the supplementary heat layer 15. A second switching component 10 that cooperates with the delivery pipe 9 is also provided in the furnace body 1, and the second switching component 10 includes a first linear drive member 101 and a branch pipe 102. The first linear drive member 101 is an electric push rod. In other embodiments, the first linear drive member 101 can also be a cylinder or an oil cylinder. The branch pipe 102 is fixedly connected to the movable end of the first linear drive member 101, and the branch pipe 102 is located in the air inlet chamber 4; one end of the branch pipe 102 is used to communicate with the input port 41, and the other end of the branch pipe 102 is used to communicate with the delivery pipe 9. When one end of the branch pipe 102 is connected to the input port 41 , the other end of the branch pipe 102 is connected to the delivery pipe 9 ; when one end of the branch pipe 102 is staggered with the input port 41 , the other end of the branch pipe 102 is staggered with the delivery pipe 9 .
[0040] Reference Figure 2 When the furnace body 1 performs combustion treatment of the waste gas, the two ends of the branch pipe 102 are staggered with the input port 41 and the delivery pipe 9, respectively, and the untreated waste gas flows into the air inlet cavity 4 and then flows into the corresponding air duct layer, and then performs subsequent combustion treatment. Figure 3 and Figure 4 When the residual waste gas in the air duct layer is purged, the two ends of the branch pipe 102 are connected to the input port 41 and the delivery pipe 9 respectively. At this time, the new waste gas flowing in through the input port 41 can directly flow into the delivery pipe 9 through the branch pipe 102, and then flow into the supplementary heating layer 15. After the heating layer 15 is heated, this part of the new waste gas can be discharged to the supplementary heating layer 15 through the discharge port 931, and then flow into the next catalytic layer for combustion reaction. The gas after combustion treatment flows into the outlet cavity 5 again, and then flows into the inlet cavity 4 again through the purge pipe 8, and then the air duct layer is purged again. That is, during the purging process, the newly entered waste gas and the gas after combustion treatment will not be mixed in the inlet cavity 4, and the newly entered waste gas will not flow into the air duct layer that needs to be purged, so the newly entered waste gas is not easy to affect the purging effect.
[0041] Reference Figure 5The delivery pipe 9 includes a connecting portion 91, a curved portion 92 and a straight portion 93. The connecting portion 91 is provided on the furnace body 1, and the curved portion 92 and the straight portion 93 are both located in the supplementary heat layer 15 inside the furnace body 1. The end of the connecting portion 91 located outside the furnace body 1 is connected to the air inlet cavity 4, and the end of the connecting portion 91 located inside the furnace body 1 is connected to the curved portion 92; the curved portion 92 is connected to the straight portion 93, and the discharge port 931 is provided on the straight portion 93. There are multiple discharge ports 931 and they are evenly spaced along the length direction of the straight portion 93. The curved portion 92 is provided in a serpentine tubular shape, so that the residence time of the new exhaust gas in the curved portion 92 can be extended, so that the new exhaust gas in the curved portion 92 is heated more fully, thereby ensuring the subsequent combustion effect.
[0042] There are multiple straight portions 93 , which are evenly spaced apart. Each straight portion 93 is connected to the curved portion 92 , so that the exhaust gas in the conveying pipe 9 can be discharged into the heating supplement layer 15 more evenly.
[0043] Reference Figure 2 , Figure 5 and Figure 6 , a connecting pipe 18 is provided at each discharge port 931 on the straight portion 93, and the connecting pipe 18 and the discharge port 931 are rotatably connected. The end of the connecting pipe 18 is fixedly connected to a turntable 19, and a cavity is provided inside the turntable 19. The peripheral side of the turntable 19 is provided with exhaust ports 191 along its own tangential direction, and the exhaust ports 191 are provided in multiple numbers and arranged in a circumferential array. Therefore, the exhaust gas in the straight portion 93 can flow into the turntable 19 through the discharge port 931 and the connecting pipe 18, and then be discharged through the exhaust port 191 on the turntable 19. Since the exhaust gas is discharged along the tangential direction of the turntable 19, the turntable 19 can rotate around its own axis during the process of the exhaust gas being discharged into the supplementary heating layer 15, so that the exhausted exhaust gas can be mixed with the purged exhaust gas, and then flow into the next catalytic layer for combustion reaction, and the reaction is more complete.
[0044] Furthermore, fan blades 192 are fixedly connected to the outer wall of the turntable 19. The fan blades 192 are provided in plurality and arranged in a circular array. Therefore, when the turntable 19 rotates, the fan blades 192 can be driven to rotate, thereby enhancing the mixing effect on the gas.
[0045] Reference Figure 1 In addition, a heat exchanger 22 is provided between one end of the delivery pipe 9 outside the furnace body 1 and the purge pipe 8. The heat exchanger 22 is a heat pipe heat exchanger. In other embodiments, the heat exchanger 22 can also be a shell-and-tube heat exchanger. Therefore, during the purge process, the gas refluxed in the purge pipe 8 can exchange heat with the new exhaust gas in the delivery pipe 9, preheating the new exhaust gas, thereby facilitating a more complete combustion inside the furnace body 1 later.
[0046] An air inlet pipe 24 is also provided at one end of the delivery pipe 9 located outside the furnace body 1. The air inlet pipe 24 is connected to the delivery pipe 9. A valve 241 and a second fan 242 are provided at the air inlet pipe 24. The end of the air inlet pipe 24 away from the delivery pipe 9 is connected to the outside. The air inlet pipe 24 is mainly used to introduce fresh air to accelerate the air flow in the furnace body 1, so that the furnace body 1 can be heated to the required temperature more quickly when it is started.
[0047] The implementation principle of an electric heating type heat storage catalytic furnace in an embodiment of the present application is: in the initial state, the air inlet 2 of the upper air duct layer 11 is opened, and the air outlet 3 of the lower air duct layer 12 is opened; the two ends of the branch pipe 102 are staggered with the input port 41 and the delivery pipe 9 respectively; the valve body 20 at the end of the delivery pipe 9 is in a closed state. The exhaust gas flows into the air inlet cavity 4 through the input port 41, then flows into the upper air duct layer 11, and then flows into the upper heat storage layer 13. The exhaust gas absorbs the heat in the upper heat storage layer 13 and heats up, thereby preheating the exhaust gas; then the preheated exhaust gas flows downward into the upper catalytic layer 14 and the supplementary heat layer 15, and the exhaust gas is further heated in the supplementary heat layer 15, so that the exhaust gas reaches the temperature for starting the catalytic combustion reaction; then the exhaust gas flows into the lower catalytic layer 16 for catalytic combustion, and the exhaust gas after combustion flows into the lower heat storage layer 17, and the lower heat storage layer 17 absorbs the heat in the exhaust gas to achieve heat recovery; then the exhaust gas after heat exchange with the lower heat storage layer 17 flows into the lower air duct layer 12, and then flows into the air outlet cavity 5, and then is discharged from the output port 51 to the outside atmosphere, completing the catalytic combustion treatment of the exhaust gas, and the discharged exhaust gas can meet the emission standards.
[0048] After a period of time, the flow direction of the exhaust gas needs to be switched. Before the switch, the state of the three-way valve 21 is changed so that the output port 51 is connected to the purge pipe 8; the first linear drive member 101 drives the branch pipe 102 to slide so that the two ends of the branch pipe 102 are respectively connected to the input port 41 and the delivery pipe 9; the valve body 20 at the end of the delivery pipe 9 is opened. At this time, the gas that meets the emission standards in the air outlet cavity 5 can flow back to the air inlet cavity 4 through the purge pipe 8, and then this part of the gas flows into the upper air duct layer 11, and the unburned exhaust gas remaining in the upper air duct layer 11 is purged into the upper heat storage layer 13, and then flows downward to perform catalytic combustion on the remaining exhaust gas. At the same time, new exhaust gas continues to flow in through the input port 41, and the exhaust gas then flows into the connecting part 91 through the branch pipe 102. The new exhaust gas in the connecting part 91 exchanges heat with the burned gas in the purge pipe 8 to preheat the new exhaust gas; the preheated exhaust gas then flows into the curved part 92 to further heat up, and then flows out to the supplementary heating layer 15 through the discharge port 931; the exhaust gas after heat exchange by the heat exchange element 22 and heating by the supplementary heating layer 15 flows into the lower catalytic layer 16 for catalytic combustion, and then flows into the lower air duct layer 12, and then flows into the purge pipe 8 for cyclic purge.
[0049] The arrangement of the conveying pipe 9 allows the new exhaust gas to flow directly into the supplementary heating layer 15 when the residual exhaust gas in the upper air duct layer 11 and the upper catalytic layer 14 is purged, and then the gas in the supplementary heating layer 15 flows into the lower catalytic layer 16 for catalytic combustion. The new exhaust gas is not easy to flow into the upper air duct layer 11 and the upper catalytic layer 14, so the newly introduced exhaust gas is not easy to affect the purging process, which helps to ensure the purging effect.
[0050] After a period of purging, the movable ends of the two second linear drive members 71 slide in the opposite direction, so that the air inlet 2 of the lower air duct layer 12 is opened, and the air outlet 3 of the upper air duct layer 11 is opened. At this time, the three-way valve 21 is switched to a state where the air outlet cavity 5 is connected to the output port 51, and the branch pipe 102 slides to a state where it is staggered with the input port 41 and the delivery pipe 9, and the valve body 20 at the end of the delivery pipe 9 is closed. Then the exhaust gas flows into the air inlet cavity 4, then into the lower air duct layer 12, and then into the lower heat storage layer 17 for preheating, and then flows upward into the lower catalytic layer 16 and the supplementary heat layer 15 for further heating. The heated exhaust gas flows into the upper catalytic layer 14 for catalytic combustion, and the exhaust gas after combustion flows into the upper heat storage layer 13 for heat exchange to achieve heat recovery; the gas after heat exchange flows into the upper air duct layer 11, then into the air outlet cavity 5, and then discharged to the outside atmosphere through the output port 51.
[0051] The above are optional embodiments of the present application, and are not intended to limit the protection scope of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.
Claims
1. An electric heating type heat storage catalytic furnace, characterized in that: include: A furnace body (1), wherein an upper air duct layer (11) and a lower air duct layer (12) are provided in the furnace body (1), an upper heat storage layer (13), an upper catalytic layer (14), a heat supplement layer (15), a lower catalytic layer (16) and a lower heat storage layer (17) are provided in sequence between the upper air duct layer (11) and the lower air duct layer (12), an air inlet (2) and an air outlet (3) are provided in the upper air duct layer (11) and the lower air duct layer (12), an air inlet cavity (4) connected to the two air inlets (2) and an air outlet cavity (5) connected to the two air outlets (3) are provided in the furnace body (1), an input port (41) connected to the air inlet cavity (4) and an output port (51) connected to the air outlet cavity (5) are provided on the furnace body (1), and a first fan (6) is provided at the input port (41) and the output port (51); The first switching assembly (7) is provided with two groups, which are respectively located in the air inlet cavity (4) and the air outlet cavity (5), and are used to control the opening and closing of the air inlet (2) or the air outlet (3), so that the air inlet (2) of the upper air duct layer (11) and the air outlet (3) of the lower air duct layer (12) are opened at the same time, or the air inlet (2) of the lower air duct layer (12) and the air outlet (3) of the upper air duct layer (11) are opened at the same time; A purge pipe (8) is arranged on the furnace body (1), one end of the purge pipe (8) is connected to the air inlet cavity (4), and the other end of the purge pipe (8) is connected to an air supply source; A delivery pipe (9) is arranged on the furnace body (1); one end of the delivery pipe (9) is provided with a valve body (20) and is in communication with the air inlet chamber (4); the other end of the delivery pipe (9) is located in the supplementary heating layer (15); and one end of the delivery pipe (9) located in the supplementary heating layer (15) is provided with a discharge port (931); The second switching assembly (10) is arranged in the air intake chamber (4), and comprises a first linear drive member (101) and a branch pipe (102), wherein the branch pipe (102) is arranged at the movable end of the first linear drive member (101); when one end of the branch pipe (102) is connected to the input port (41), the other end of the branch pipe (102) is connected to the delivery pipe (9), so that untreated exhaust gas entering the air intake chamber (4) can flow into the heating supplement layer (15) through the delivery pipe (9).
2. The electric heating type regenerative catalytic furnace according to claim 1, characterized in that: The first switching assembly (7) comprises a second linear drive member (71) and a baffle (72), wherein the second linear drive member (71) is arranged on the furnace body (1), and the baffle (72) is arranged at a movable end of the second linear drive member (71), and the baffle (72) is located in the air inlet cavity (4) or the air outlet cavity (5), and the baffle (72) is used to block the air inlet (2) or the air outlet (3).
3. The electric heating type regenerative catalytic furnace according to claim 1, characterized in that: The delivery pipe (9) comprises a connecting portion (91), a curved portion (92) and a straight portion (93); the curved portion (92) and the straight portion (93) are both located in the heat supplement layer (15); the connecting portion (91) is in communication with the air inlet cavity (4); the curved portion (92) is connected between the connecting portion (91) and the straight portion (93); the discharge port (931) is arranged on the straight portion (93); a plurality of discharge ports (931) are provided and are arranged at intervals.
4. The electric heating type regenerative catalytic furnace according to claim 3 is characterized in that: The straight line portions (93) are provided in plurality and are evenly spaced and arranged.
5. The electric heating type regenerative catalytic furnace according to claim 3 is characterized in that: The straight portion (93) is provided with a connecting pipe (18) connected to the discharge port (931); the connecting pipe (18) and the discharge port (931) are rotatably connected; a rotating disk (19) is fixedly provided on the connecting pipe (18); a cavity connected to the connecting pipe (18) is provided inside the rotating disk (19); an exhaust port (191) is provided on the circumferential side of the rotating disk (19) along its own tangential direction; the exhaust port (191) is connected to the cavity inside the rotating disk (19).
6. The electric heating type regenerative catalytic furnace according to claim 5, characterized in that: The rotating disk (19) is provided with fan blades (192), and a plurality of the fan blades (192) are provided and arranged in a circular array.
7. The electric heating type regenerative catalytic furnace according to claim 1, characterized in that: One end of the purge pipe (8) away from the air inlet chamber (4) is in communication with the output port (51), and a three-way valve (21) is provided between the purge pipe (8) and the output port (51).
8. The electric heating type regenerative catalytic furnace according to claim 7, characterized in that: A heat exchange component (22) is provided between the purge pipe (8) and the delivery pipe (9).
9. The electric heating type regenerative catalytic furnace according to claim 1, characterized in that: The delivery pipe (9) is provided with a valve (241) and a second fan (242).
10. The electric heating type regenerative catalytic furnace according to claim 1, characterized in that: A heat-insulating layer (23) is provided in the furnace body (1), and the heat-insulating layer (23) is arranged around the outer sides of the upper heat storage layer (13), the upper catalytic layer (14), the heat supplement layer (15), the lower catalytic layer (16), and the lower heat storage layer (17).