A tail gas treatment system for lost foam casting

Abstract

The present application relates to an exhaust gas treatment system for lost foam casting, which belongs to the technical field of exhaust gas treatment, and includes an air collection module, a pretreatment module and a catalytic combustion module arranged in sequence, the pretreatment module includes an adsorption box, the adsorption box is arranged from top to bottom as an upper box chamber, a middle box chamber and a lower box chamber, the upper box chamber is provided with an air inlet port connected to the air collection module, a first valve port that can be opened and closed is provided between the upper box chamber and the middle box chamber, a second valve port that can be opened and closed is provided between the middle box chamber and the lower box chamber, the lower box chamber is connected to a main blower, an adsorption mechanism is provided in the middle box chamber, the middle box chamber is divided into a cold air room and a hot air room from top to bottom by the adsorption mechanism, the cold air room is connected to an upper air duct, the hot air room is connected to a lower air duct, the input end of the catalytic combustion module is connected to the upper air duct, and the output end is connected to the lower air duct. The present application is conducive to improving the pretreatment effect of the exhaust gas, improving the efficiency of catalytic combustion, and reducing production costs.

Description

Technical Field

[0001] The present application relates to the field of tail gas treatment, and in particular to a tail gas treatment system for lost foam casting. Background Art

[0002] Lost foam casting is a solid casting method that uses dry sand without binder and vacuum technology to make foam plastic molds. It is a new casting method that combines foam models with similar size and shape to the casting into a model cluster, brushes refractory coating and dries it, buries it in dry quartz sand and vibrates it to shape it, and pours it under negative pressure to vaporize the model, so that liquid metal occupies the model position and forms a casting after solidification and cooling.

[0003] When lost foam casting is being poured, it is necessary to burn the white mold, which is polystyrene foam. After the white mold is burned, the waste gas containing benzene organic matter is discharged into the atmosphere by the vacuum pump, causing pollution to the surrounding environment. In the related technology, the exhaust gas of the lost foam is treated by the combustion method, and the exhaust gas generates water and carbon dioxide after combustion. Therefore, at present, many lost foam waste gas treatment devices directly discharge the waste gas into the combustion device through a vacuum pump for combustion. However, the particulate matter and carbon black generated during the lost foam casting process can easily cover the catalyst or react with the catalyst, causing the catalyst to lose its activity, thereby requiring the replacement of a new catalyst, which increases the production cost. Summary of the invention

[0004] In order to improve the pretreatment effect of exhaust gas and reduce production costs, the present application provides an exhaust gas treatment system for lost foam casting.

[0005] The present application provides an exhaust gas treatment system for lost foam casting, which adopts the following technical solution:

[0006] A tail gas treatment system for lost foam casting comprises an air collection module, a pretreatment module and a catalytic combustion module which are arranged in sequence, the pretreatment module comprising an adsorption box, the adsorption box being arranged from top to bottom as an upper box chamber, a middle box chamber and a lower box chamber, the upper box chamber being provided with an air inlet port which is connected to the air collection module, a first valve port which can be opened and closed is provided between the upper box chamber and the middle box chamber, a second valve port which can be opened and closed is provided between the middle box chamber and the lower box chamber, the lower box chamber is connected to a main fan, an adsorption mechanism is provided in the middle box chamber, the middle box chamber is divided into a cold air room and a hot air room from top to bottom by the adsorption mechanism, the cold air room is connected to an upper air duct, the hot air room is connected to a lower air duct, the input end of the catalytic combustion module is connected to the upper air duct, and the output end is connected to the lower air duct.

[0007] By adopting the above technical solution, when using the system, the main fan is started, and the tail gas in the lost foam casting workshop is collected through the gas collection module. When the first valve port is opened, the tail gas enters the middle box chamber from the upper box chamber, and the tail gas is adsorbed and treated by the adsorption mechanism in the middle box chamber, and the particulate matter and other solid impurities in the tail gas can be adsorbed. The tail gas after adsorption enters the catalytic combustion module through the upper air duct for catalytic combustion of the tail gas. Before the catalytic combustion is carried out, the present application first adsorbs and removes the particulate matter in the tail gas, improves the pretreatment effect of the tail gas, and reduces the possibility of the catalyst in the catalytic combustion module being contaminated and covered, thereby ensuring the activity of the catalyst and the efficiency of the catalytic combustion, and reducing the production cost. In addition, the gas product after the catalytic combustion can enter the hot air room through the lower air duct, and can exchange heat with the tail gas in the cold air room, so that the tail gas in the cold air room is preheated while cooling itself, realizing the utilization of waste heat, which is conducive to improving the catalytic combustion efficiency of the system.

[0008] Optionally, the catalytic combustion module includes a bottom box and a catalytic box and a heat exchange box arranged on the bottom box, the catalytic box being provided with a catalytic combustion mechanism, the catalytic box being provided with an upper opening and a lower opening, and the upper opening being provided above the catalytic combustion mechanism, and the lower opening being provided below the catalytic combustion mechanism, the heat exchange box being provided with a cold inlet and a cold outlet, the cold inlet being connected to an upper air duct, and the cold outlet being connected to a lower opening, the upper end of the heat exchange box being provided with a hot inlet, and the lower end being provided with a hot outlet, the hot inlet being connected to the upper opening, the hot outlet being connected to the bottom box, and the bottom box being connected to the lower air duct.

[0009] By adopting the above technical scheme, the exhaust gas before catalytic combustion enters the heat exchange box through the cold inlet. At the same time, the gas product after catalytic combustion of the exhaust gas enters the heat exchange box from the upper opening through the hot inlet. The gases before and after catalytic combustion are heat exchanged in the heat exchange box, so that the exhaust gas is preheated twice before passing through the catalytic combustion mechanism, which further improves the thermal energy utilization efficiency, thereby further improving the catalytic combustion efficiency of the system.

[0010] Optionally, the catalytic combustion mechanism includes a catalytic component and a placement plate for placing the catalytic component, a heating component is provided under the placement plate, the placement plate and the heating component are both fixed in the catalytic box, and the catalytic combustion mechanism is provided in multiple groups.

[0011] Optionally, a first valve plate is provided at the first valve port, a second valve plate is provided at the second valve port, an intermediate rod is connected between the first valve plate and the second valve plate, a lifting mechanism is provided in the upper box chamber, and an output end of the lifting mechanism is connected to the first valve plate.

[0012] Optionally, the lifting mechanism includes an electromagnet and a magnetic block arranged in the upper box chamber, a guide rod is vertically arranged at the upper end of the first valve plate, the magnetic block is arranged at the upper end of the guide rod, a guide sleeve is sleeved on the outer side of the guide rod, the guide sleeve is fixed to the lower side of the electromagnet and the active end of the electromagnet extends into the guide sleeve.

[0013] Optionally, the middle box chamber is provided with a plurality of them, the upper air duct is provided with an upper exhaust box, the upper exhaust box is arranged one-to-one with the middle box chamber, the upper end of the upper exhaust box is provided with an upper box opening, the upper box opening is located in the corresponding cold air room, and one side of the middle rod is connected with an upper cover plate for closing the upper box opening;

[0014] The lower air duct is provided with a lower exhaust box, and the lower exhaust box is arranged one-to-one with the middle box chamber. The upper end of the lower exhaust box is provided with a lower box opening, and the lower box opening is located in the corresponding hot air room. One side of the middle rod is connected with a lower cover plate for closing the lower box opening;

[0015] When the intermediate rod is at the upper limit position, the first valve port and the second valve port are in a closed state, and the upper box port and the lower box port are in an open state;

[0016] When the intermediate rod is at the lower limit position, the first valve port and the second valve port are in an open state, and the upper box port and the lower box port are in a closed state.

[0017] Optionally, the adsorption mechanism includes a partition arranged in the middle box chamber and an adsorption filter cartridge arranged on the lower side of the partition, the partition is provided with a through hole for the middle rod to pass through, a plurality of connecting pipes are passed through the lower side of the partition, the connecting pipes are detachably connected to the adsorption filter cartridge, and the connecting pipes are connected to the inner cavity of the adsorption filter cartridge, and a closed bottom plate is provided at the lower end of the adsorption filter cartridge.

[0018] Optionally, a connecting frame is provided on the inner side of the adsorption filter cartridge, the lower end of the connecting frame is fixed to the closed bottom plate, the upper end is provided with an outer sleeve, the upper end of the side wall of the outer sleeve is provided with an L-shaped groove, and the outer side of the connecting pipe is provided with a clamping rod matching the L-shaped groove.

[0019] Optionally, the bottom box is provided with a first exhaust pipe and a first on-off piece for controlling the on-off of the first exhaust pipe, the end of the first exhaust pipe away from the bottom box is provided with a front connecting air box, the front connecting air box is connected to a radiator, the output end of the radiator is provided with a rear connecting air box, the rear connecting air box is connected to a hot air blower, and the output end of the hot air blower is connected to the downwind duct.

[0020] Optionally, the rear connecting gas box and the front connecting gas box are connected via a gas mixing box, a second exhaust pipe and a second on-off piece for controlling the on-off of the second exhaust pipe are provided on the bottom box, and the end of the second exhaust pipe away from the bottom box is connected to the gas mixing box.

[0021] In summary, the present application includes at least one of the following beneficial technical effects:

[0022] 1. Through the setting of the adsorption box, the present application first adsorbs and removes the particulate matter in the tail gas before catalytic combustion, improves the pretreatment effect of the tail gas, and reduces the possibility of the catalyst in the catalytic combustion module being contaminated and covered, thereby ensuring the activity of the catalyst and the efficiency of catalytic combustion, and reducing production costs. In addition, the gas product after catalytic combustion can enter the hot air room through the downwind duct, and can exchange heat with the tail gas in the cold air room, so that the tail gas in the cold air room can be preheated while cooling itself, realizing the utilization of waste heat, which is beneficial to improving the catalytic combustion efficiency of the system.

[0023] 2. Through the setting of the catalytic box, the heat exchange box and the bottom box, the exhaust gas before catalytic combustion enters the heat exchange box through the cold inlet. At the same time, the gas product after catalytic combustion of the exhaust gas enters the heat exchange box from the upper opening through the hot inlet. The gas before and after catalytic combustion is heat exchanged in the heat exchange box, so that the exhaust gas is preheated twice before passing through the catalytic combustion mechanism, which further improves the thermal energy utilization efficiency, thereby further improving the catalytic combustion efficiency of the system.

[0024] 3. Through the arrangement of the electromagnet, the magnetic block, the guide rod and the guide cylinder, when the electromagnet is excited to generate magnetism, the magnetic block is subjected to an upward magnetic attraction, driving the guide rod to move upward, and then driving the first valve plate to move upward; when the electromagnet is powered off and loses magnetism, the magnetic block and the components connected thereto fall downward under the action of gravity, and then driving the first valve plate to move downward, thereby achieving the purpose of driving the first valve plate to rise and fall. The guide cylinder can guide the lifting and falling movement of the guide rod. In addition, since the exhaust gas in the upper chamber contains some iron powder and iron filings, the guide cylinder can cover and protect the active end of the electromagnet to prevent the electromagnet from being exposed to the iron powder and iron filings adsorbed in the exhaust gas in the upper chamber when it is excited to generate magnetism, thereby affecting the magnetic attraction of the magnetic block.

[0025] 4. Through the arrangement of the partition, adsorption filter cartridge and closed bottom plate, the upper side of the partition and the inner cavity of the adsorption filter cartridge form a cold air room, and the lower side of the partition and the outer side of the adsorption filter cartridge form a hot air room. The clean gas products in the hot air room can exchange heat with the tail gas in the cold air room, thereby preheating the tail gas. Moreover, the density of the gas products in the hot air room is lower than that of the tail gas in the cold air room. The gas products are subject to the floating force and can quickly move to the outside of the adsorption filter cartridge and exchange heat with the tail gas that passes through the adsorption filter cartridge and reaches the outside of the adsorption filter cartridge. The original tail gas gradually floats up as the temperature rises after heat transfer, so that the tail gas in the cold air room passes through the adsorption filter cartridge twice, first from the inside to the outside and then from the outside to the inside, achieving two adsorption filtrations, which improves the adsorption effect of the system on the tail gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1It is a schematic diagram of the overall structure of an exhaust gas treatment system for lost foam casting according to an embodiment of the present application.

[0027] Figure 2 It is a schematic diagram of the overall structure of the adsorption box in the embodiment of the present application.

[0028] Figure 3 It is a structural schematic diagram reflecting the internal structure of the adsorption box in the embodiment of the present application.

[0029] Figure 4 It is a schematic diagram of the overall structure of the catalytic combustion module in the embodiment of the present application.

[0030] Figure 5 It is a cross-sectional view showing the internal structure of the catalyst box in the embodiment of the present application.

[0031] Figure 6 It is a structural schematic diagram reflecting the connection relationship between the heat exchange box and the catalyst box in the embodiment of the present application.

[0032] Figure 7 It is a structural schematic diagram that embodies the connection relationship between the first valve plate and the second valve plate in the embodiment of the present application.

[0033] Figure 8 It is a cross-sectional view of the lifting mechanism in the embodiment of the present application.

[0034] Fig. 9 It is a schematic diagram of the structure of the adsorption mechanism in the embodiment of the present application, wherein for the convenience of display, only one of the adsorption filter cartridges is drawn.

[0035] Fig.10 It is an exploded view showing the connection relationship between the outer sleeve and the connecting pipe in the embodiment of the present application.

[0036] Explanation of reference numerals: 1. gas collection module; 2. pretreatment module; 21. filter box; 22. adsorption box; 221. upper box chamber; 2211. air inlet port; 2212. first valve port; 222. middle box chamber; 2221. cold air room; 2222. hot air room; 223. lower box chamber; 2231. second valve port; 224. first valve plate; 2241. guide rod; 225. second valve plate; 226. intermediate rod; 2261. upper cover plate; 2262. lower cover plate; 227. lifting mechanism; 2271. electromagnet; 2272. magnetic guide block; 2273. guide cylinder; 23. upper air duct; 231. upper exhaust box; 2311. upper box port; 24. lower air duct; 241. lower exhaust box; 2411. lower box port; 3. catalytic combustion module; 31. bottom box; 311 , first exhaust pipe; 3111, front connecting gas box; 312, first switch; 313, second exhaust pipe; 314, second switch; 32, catalyst box; 321, upper opening; 322, lower opening; 33, heat exchange box; 331, cold inlet; 332, cold outlet; 333, hot inlet; 334, hot outlet; 34, catalytic combustion mechanism; 341, catalytic element; 342, placement plate; 343, heating element; 4, main fan; 41, exhaust chimney; 5, adsorption mechanism; 51, partition; 511, perforation; 512, connecting pipe; 513, clamping rod; 52, adsorption filter cartridge; 53, closed bottom plate; 54, connecting frame; 55, outer sleeve; 551, L-shaped slot; 6, radiator; 61, rear connecting gas box; 611, hot air blower; 612, gas mixing box. DETAILED DESCRIPTION

[0037] The following is combined with Figure 1-10 , further details of this application are given.

[0038] Example:

[0039] The present application discloses an exhaust gas treatment system for lost foam casting. Figure 1 A tail gas treatment system for lost foam casting comprises a gas collection module 1, a pretreatment module 2 and a catalytic combustion module 3 which are arranged in sequence, wherein the gas collection module 1 is used to collect the tail gas in the lost foam casting workshop, the pretreatment module 2 is used to pretreat the tail gas to remove particulate matter and other solid impurities in the tail gas, and the catalytic combustion module 3 is used to catalytically burn the organic waste gas in the tail gas to achieve purification of the tail gas and reduce the pollution caused by the tail gas emission to the environment.

[0040] Reference Figure 1The gas collection module 1 is a common tail gas collection pipeline, and the pretreatment module 2 includes a filter box 21 and an adsorption box 22 which are connected in sequence. The filter box 21 is a conventional mesh filter box 21, which is used to filter large-sized solid impurities, and the adsorption box 22 is used to adsorb small-sized particles. In this way, before catalytic combustion, large-sized solid impurities and small-sized particles in the tail gas are first removed, which improves the pretreatment effect of the tail gas and reduces the possibility of the catalyst in the catalytic combustion module 3 being contaminated or covered, thereby ensuring the activity of the catalyst and the efficiency of catalytic combustion, and reducing production costs.

[0041] Reference Figure 1-3 The adsorption box 22 is arranged from top to bottom as an upper box chamber 221, a middle box chamber 222 and a lower box chamber 223. An air inlet port 2211 is provided on the upper box chamber 221, and the air inlet port 2211 is connected to the output end of the filter box 21. A first valve port 2212 that can be opened and closed is provided between the upper box chamber 221 and the middle box chamber 222. A second valve port 2231 that can be opened and closed is provided between the middle box chamber 222 and the lower box chamber 223. The lower box chamber 223 is connected to the main fan 4. An adsorption mechanism 5 is provided in the middle box chamber 222. The middle box chamber 222 is divided into a cold air room 2221 and a hot air room 2222 from top to bottom by the adsorption mechanism 5. The cold air room 2221 is connected to the upper air duct 23, and the hot air room 2222 is connected to the lower air duct 24. The input end of the catalytic combustion module 3 is connected to the upper air duct 23, and the output end is connected to the lower air duct 24.

[0042] When using the system, the main fan 4 is started, and the tail gas in the lost foam casting workshop is collected through the gas collecting module 1. When the first valve port 2212 is opened, the tail gas enters the middle box chamber 222 from the upper box chamber 221, and the tail gas is adsorbed by the adsorption mechanism 5 in the middle box chamber 222, and the particulate matter and other solid impurities in the tail gas can be adsorbed. The tail gas after adsorption enters the catalytic combustion module 3 through the upper air duct 23 for catalytic combustion of the tail gas. Before the catalytic combustion, the present application first adsorbs and removes the particulate matter in the tail gas, improves the pretreatment effect of the tail gas, and reduces the possibility of the catalyst in the catalytic combustion module 3 being contaminated and covered, thereby ensuring the activity of the catalyst and the efficiency of catalytic combustion, and reducing production costs. In addition, the gas product after catalytic combustion can enter the hot air room 2222 through the lower air duct 24, and can exchange heat with the tail gas in the cold air room 2221, so that the tail gas in the cold air room 2221 is preheated while cooling itself, realizing the utilization of waste heat, which is conducive to improving the catalytic combustion efficiency of the system.

[0043] Reference Figure 2 and Figure 4-6The catalytic combustion module 3 includes a bottom box 31, a catalytic box 32 and a heat exchange box 33 fixed on the bottom box 31. A catalytic combustion mechanism 34 is arranged in the catalytic box 32. An upper opening 321 and a lower opening 322 are provided on the side of the catalytic box 32 close to the heat exchange box 33. The upper opening 321 is arranged above the catalytic combustion mechanism 34, and the lower opening 322 is arranged below the catalytic combustion mechanism 34. A cold inlet 331 and a cold outlet 332 are provided on the side wall of the heat exchange box 33. The cold inlet 331 is connected to the upper air duct 23, and the cold outlet 332 is connected to the lower opening 322. A hot inlet 333 is provided at the upper end of the heat exchange box 33, and a hot outlet 334 is provided at the lower end. The hot inlet 333 is connected to the upper opening 321, and the hot outlet 334 is connected to the bottom box 31. The bottom box 31 is connected to the lower air duct 24. In this way, the exhaust gas before catalytic combustion enters the heat exchange box 33 through the cold inlet 331. At the same time, the gas product after catalytic combustion of the exhaust gas enters the heat exchange box 33 from the upper opening 321 through the hot inlet 333. The gases before and after catalytic combustion are heat exchanged in the heat exchange box 33, so that the exhaust gas is preheated twice before passing through the catalytic combustion mechanism 34, further improving the thermal energy utilization efficiency, thereby further improving the catalytic combustion efficiency of the system.

[0044] Reference Figure 1 and Figure 5-6 The catalytic combustion mechanism 34 includes a catalytic element 341 and a placement plate 342 for placing the catalytic element 341. A heating element 343 is arranged below the placement plate 342. The placement plate 342 and the heating element 343 are both fixed in the catalytic box 32. The catalytic combustion mechanism 34 is provided with multiple groups. In this embodiment, the catalytic element 341 is a catalytic plate with a porous structure, the placement plate 342 is a grate plate, and the heating element 343 is one of an electric heating tube and an electric heating wire or a combination thereof. After the secondary preheating, the exhaust gas enters the catalytic box 32 from the cold outlet 332, and the heating element 343 heats and raises the temperature. The exhaust gas gradually rises in the catalytic box 32. When passing through the catalytic element 341, with the help of the catalytic effect of the catalytic element 341, the exhaust gas is flamelessly burned at a lower ignition temperature, so that the organic waste gas in the exhaust gas is decomposed into carbon dioxide and water vapor, thereby achieving exhaust gas purification. The gas product after catalytic combustion passes through the heat exchange box 33, the bottom box 31, the lower air duct 24, and the hot air room 2222 in sequence. In this process, the tail gas to be catalytically combusted at the rear is preheated twice. Finally, when the second valve port 2231 is opened, the gas product enters the lower box chamber 223 and is exhausted to the tail gas chimney 41 by the main fan 4 to achieve discharge.

[0045] Reference Figure 3 and Figure 7, a first valve plate 224 is provided at the first valve port 2212, a second valve plate 225 is provided at the second valve port 2231, an intermediate rod 226 is fixedly connected between the first valve plate 224 and the second valve plate 225, a lifting mechanism 227 is provided in the upper chamber 221, and the output end of the lifting mechanism 227 is connected to the first valve plate 224. In this way, the lifting mechanism 227 can drive the first valve plate 224 to rise and fall, thereby achieving the purpose of controlling the opening and closing of the first valve port 2212, and at the same time, the intermediate rod 226 drives the second valve plate 225 to move synchronously, thereby achieving the purpose of synchronously controlling the opening and closing of the second valve port 2231. In this way, the opening and closing states of the first valve port 2212 and the second valve port 2231 can always remain consistent, which is conducive to maintaining the air pressure balance in the system.

[0046] Reference Figure 3 and Figure 7-8 The lifting mechanism 227 includes an electromagnet 2271 and a magnetic block 2272. The electromagnet 2271 is fixed in the upper chamber 221. A guide rod 2241 is vertically fixed in the center of the upper end of the first valve plate 224. The magnetic block 2272 is fixed to the upper end of the guide rod 2241. A guide cylinder 2273 is sleeved on the outer side of the guide rod 2241. The guide cylinder 2273 is fixed to the lower side of the electromagnet 2271 and the active end of the electromagnet 2271 extends into the guide cylinder 2273. When the electromagnet 2271 is excited and magnetized, the magnetic block 2272 is subjected to an upward magnetic attraction force, driving the guide rod 2241 to move upward, thereby driving the first valve plate 224 to move upward; when the electromagnet 2271 is powered off and loses magnetism, the magnetic block 2272 and the components connected thereto fall downward under the action of gravity, thereby driving the first valve plate 224 to move downward, thereby achieving the purpose of driving the first valve plate 224 to move up and down. The guide cylinder 2273 can guide the lifting and lowering movement of the guide rod 2241. In addition, since the exhaust gas in the upper box chamber 221 contains some iron powder and iron filings, the guide cylinder 2273 can cover and protect the active end of the electromagnet 2271 to prevent the electromagnet 2271 from being exposed to the iron powder and iron filings in the exhaust gas in the upper box chamber 221 when being energized and magnetized, thereby affecting the magnetic attraction of the magnetic conductive block 2272.

[0047] Reference Figure 2-3 and Figure 7 The middle box chamber 222 is provided with a plurality of upper exhaust boxes 231 connected to the side wall of the upper air duct 23. The upper exhaust boxes 231 are arranged one by one with the middle box chamber 222. An upper box opening 2311 is opened at the upper end of the upper exhaust box 231. The upper box opening 2311 is located in the corresponding cold air room 2221. An upper cover plate 2261 for closing the upper box opening 2311 is fixedly connected to one side of the middle rod 226.

[0048] The side wall of the lower air duct 24 is connected with a lower exhaust box 241, which is arranged one-to-one with the middle box chamber 222. The upper end of the lower exhaust box 241 is provided with a lower box opening 2411, which is located in the corresponding hot air room 2222. A lower cover plate 2262 for closing the lower box opening 2411 is fixedly connected to one side of the middle rod 226.

[0049] When the middle rod 226 is in the upper limit position, the first valve port 2212 and the second valve port 2231 are in a closed state, and the upper box port 2311 and the lower box port 2411 are in an open state; when the middle rod 226 is in the lower limit position, the first valve port 2212 and the second valve port 2231 are in an open state, and the upper box port 2311 and the lower box port 2411 are in a closed state.

[0050] When the main fan 4 is started, the first valve port 2212 and the second valve port 2231 are opened, and the exhaust gas originally in the upper box chamber 221 enters into the cold air room 2221, and the gas products originally in the hot air room 2222 enter into the lower box chamber 223. At this time, the upper box port 2311 and the lower box port 2411 are closed, and a certain time is set to allow the exhaust gas in the cold air room 2221 to fully contact with the adsorption mechanism 5, thereby ensuring the adsorption effect of the exhaust gas. When the set time is reached, the main fan 4 is turned off, the first valve port 2212 and the second valve port 2231 are closed, the upper box port 2311 and the lower box port 2411 are opened, and the exhaust gas that has completed adsorption in the cold air room 2221 can enter the upper air duct 23 through the upper exhaust box 231, and supply exhaust gas to the catalytic combustion module 3; at the same time, the gas products that have completed catalytic combustion can enter the hot air room 2222 from the lower air duct 24 through the lower exhaust box 241, thereby ensuring the balance of the inlet and outlet of the catalytic combustion module 3, and thus ensuring the long-term operation of the catalytic combustion module 3.

[0051] Reference Figure 2-3 and Fig. 9The adsorption mechanism 5 includes a partition 51 fixed in the middle box chamber 222 and a plurality of adsorption filter cartridges 52 installed on the lower side of the partition 51. The partition 51 is provided with a through hole 511 for the intermediate rod 226 to pass through. A plurality of connecting pipes 512 are fixedly provided on the lower side of the partition 51. The connecting pipes 512 are detachably connected to the adsorption filter cartridge 52, and the connecting pipes 512 are communicated with the inner cavity of the adsorption filter cartridge 52. The lower end of the adsorption filter cartridge 52 is provided with a closed bottom plate 53 for closing the bottom opening of the inner cavity. In this way, the upper side of the partition 51 and the inner cavity of the adsorption filter cartridge 52 form a cold air room 2221, and the lower side of the partition 51 and the outer side of the adsorption filter cartridge 52 form a hot air room 2222. The clean gas product in the hot air room 2222 can exchange heat with the exhaust gas in the cold air room 2221, thereby preheating the exhaust gas. Moreover, the density of the gas products in the hot air room 2222 is lower than the density of the exhaust gas in the cold air room 2221. Due to the upward force, the gas products can quickly move to the outside of the adsorption filter cartridge 52 and exchange heat with the exhaust gas that passes through the adsorption filter cartridge 52 and reaches the outside of the adsorption filter cartridge 52. The original exhaust gas rises in temperature after heat transfer and gradually floats up, so that the exhaust gas in the cold air room 2221 passes through the adsorption filter cartridge 52 twice, first from the inside to the outside and then from the outside to the inside, achieving two adsorption filtrations, thereby improving the adsorption effect of the system on the exhaust gas.

[0052] Reference Figure 9-10 A connecting frame 54 is provided on the inner side of the adsorption filter cartridge 52. The lower end of the connecting frame 54 is fixed to the closed bottom plate 53, and the upper end is fixedly connected to an outer sleeve 55. An L-shaped slot 551 is provided on the upper end of the side wall of the outer sleeve 55. A clamping rod 513 matching the L-shaped slot 551 is fixed on the outer side of the connecting pipe 512. Through the setting of the L-shaped slot 551 and the clamping rod 513, the outer sleeve 55 is "turned first and then pulled out" to achieve the separation of the clamping rod 513 from the L-shaped slot 551; the L-shaped slot 551 is aligned with the clamping rod 513, "inserted first and then turned", so that the clamping rod 513 and the L-shaped slot 551 can be clamped, thereby realizing the detachable connection between the adsorption filter cartridge 52 and the connecting pipe 512, facilitating the replacement of the adsorption filter cartridge 52 and ensuring the adsorption effect of the adsorption mechanism 5.

[0053] Reference Figure 2 and Figure 4-6, one side of the bottom box 31 is connected to a first exhaust pipe 311, a first on-off member 312 for controlling the on-off of the first exhaust pipe 311 is installed in the bottom box 31, one end of the first exhaust pipe 311 away from the bottom box 31 is connected to a front connecting air box 3111, the front connecting air box 3111 is connected to a radiator 6, the output end of the radiator 6 is connected to a rear connecting air box 61, the rear connecting air box 61 is connected to a hot air blower 611, and the output end of the hot air blower 611 is connected to the lower air duct 24. Since the optimum use temperature of the filter material of the adsorption filter cartridge 52 is lower than the temperature of the gas product in the bottom box 31, in order to ensure the adsorption effect and service life of the adsorption filter cartridge 52, it is necessary to first cool the gas product in the bottom box 31, and then discharge the gas product into the lower air duct 24 through the hot air blower 611. When the gas product in the bottom box 31 is extracted, the first extraction pipe 311 is turned on, the hot air blower 611 is started, and the gas product enters the radiator 6 through the front connection gas box 3111. The gas product can be quickly cooled by the radiator 6, and then discharged into the lower air duct 24 through the rear connection gas box 61 and the hot air blower 611. When the upper box opening 2311 and the lower box opening 2411 are closed, the first on-off member 312 controls the first extraction pipe 311 to be closed, which can reduce heat leakage and effectively ensure the catalytic combustion efficiency of the catalytic module.

[0054] Reference Figure 4-6 The rear connecting gas box 61 and the front connecting gas box 3111 are connected through the gas mixing box 612, one side of the bottom box 31 is connected with the second pumping pipe 313, and the bottom box 31 is equipped with a second on-off member 314 for controlling the on-off of the second pumping pipe 313, and the end of the second pumping pipe 313 away from the bottom box 31 is connected with the gas mixing box 612. In this embodiment, the first on-off member 312 and the second on-off member 314 are both pneumatic valve plates.

[0055] When using the system, in addition to the fully closed state of the first exhaust pipe 311 and the second exhaust pipe 313 to ensure the efficiency of catalytic combustion, there are three exhaust modes for the gas products in the bottom box 31: among them, the first gear is a fully open state, which can ensure the maximum exhaust volume and improve the exhaust efficiency of the gas products in the bottom box 31 to the hot air room 2222; the second gear is a state in which the first exhaust pipe 311 is closed and the second exhaust pipe 313 is connected. When the temperature of the hot air room 2222 is lower than the set optimal use temperature, the temperature of the hot air room 2222 can be quickly heated up by adjusting the second gear; the third gear is a state in which the first exhaust pipe 311 is connected and the first exhaust pipe 311 is closed. When the temperature of the hot air room 2222 is higher than the set optimal use temperature, the temperature of the hot air room 2222 can be quickly cooled down by adjusting the third gear. When in the first gear extraction mode, a part of the gas product reaches the mixing box 612 after passing through the radiator 6, and the other part of the gas product directly enters the mixing box 612 without passing through the radiator 6. The two parts of the gas product are mixed in the mixing box 612, and the temperature of the gas product finally output is between the corresponding output temperatures of the second gear and the third gear.

[0056] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An exhaust gas treatment system for lost foam casting, characterized in that: The invention comprises a gas collection module (1), a pretreatment module (2) and a catalytic combustion module (3) which are arranged in sequence, wherein the pretreatment module (2) comprises an adsorption box (22), and the adsorption box (22) is arranged from top to bottom as an upper box chamber (221), a middle box chamber (222) and a lower box chamber (223), wherein the upper box chamber (221) is provided with an air inlet port (2211) which is connected to the gas collection module (1), and an openable and closable first valve port (2212) is provided between the upper box chamber (221) and the middle box chamber (222), and the middle box chamber (222) and the lower box chamber (223) are provided with a first valve port (2212) which is openable and closable. A second valve port (2231) that can be opened and closed is provided between the lower chamber (223), the lower chamber (223) is connected to a main fan (4), an adsorption mechanism (5) is provided in the middle chamber (222), the middle chamber (222) is divided into a cold air chamber (2221) and a hot air chamber (2222) from top to bottom by the adsorption mechanism (5), the cold air chamber (2221) is connected to an upper air duct (23), the hot air chamber (2222) is connected to a lower air duct (24), the input end of the catalytic combustion module (3) is connected to the upper air duct (23), and the output end is connected to the lower air duct (24); A first valve plate (224) is provided at the first valve port (2212), a second valve plate (225) is provided at the second valve port (2231), an intermediate rod (226) is connected between the first valve plate (224) and the second valve plate (225), a lifting mechanism (227) is provided in the upper chamber (221), and an output end of the lifting mechanism (227) is connected to the first valve plate (224); The lifting mechanism (227) comprises an electromagnet (2271) and a magnetic conductive block (2272) arranged in the upper box chamber (221); a guide rod (2241) is vertically arranged on the upper end of the first valve plate (224); the magnetic conductive block (2272) is arranged on the upper end of the guide rod (2241); a guide sleeve (2273) is sleeved on the outer side of the guide rod (2241); the guide sleeve (2273) is fixed to the lower side of the electromagnet (2271) and the active end of the electromagnet (2271) extends into the guide sleeve (2273); The middle box chamber (222) is provided with a plurality of them, the upper air duct (23) is provided with an upper exhaust box (231), the upper exhaust box (231) is arranged one-to-one with the middle box chamber (222), an upper box opening (2311) is provided at the upper end of the upper exhaust box (231), the upper box opening (2311) is located in the corresponding cold air room (2221), and an upper cover plate (2261) for closing the upper box opening (2311) is connected to one side of the middle rod (226); The lower air duct (24) is provided with a lower exhaust box (241), the lower exhaust box (241) is arranged in one-to-one correspondence with the middle box chamber (222), the upper end of the lower exhaust box (241) is provided with a lower box opening (2411), the lower box opening (2411) is located in the corresponding hot air room (2222), and one side of the intermediate rod (226) is connected with a lower cover plate (2262) for closing the lower box opening (2411); When the intermediate rod (226) is at the upper limit position, the first valve port (2212) and the second valve port (2231) are in a closed state, and the upper box port (2311) and the lower box port (2411) are in an open state; When the intermediate rod (226) is at the lower limit position, the first valve port (2212) and the second valve port (2231) are in an open state, and the upper box port (2311) and the lower box port (2411) are in a closed state.

2. The exhaust gas treatment system for lost foam casting according to claim 1, characterized in that: The catalytic combustion module (3) comprises a bottom box (31), a catalytic box (32) and a heat exchange box (33) arranged on the bottom box (31), a catalytic combustion mechanism (34) being arranged in the catalytic box (32), an upper opening (321) and a lower opening (322) being arranged on the catalytic box (32), and the upper opening (321) being arranged above the catalytic combustion mechanism (34), and the lower opening (322) being arranged below the catalytic combustion mechanism (34), and the upper opening (321) and the lower opening (322) being arranged on the heat exchange box (33). A cold inlet (331) and a cold outlet (332) are provided, the cold inlet (331) is connected to the upper air duct (23), the cold outlet (332) is connected to the lower opening (322), a hot inlet (333) is provided at the upper end of the heat exchange box (33), and a hot outlet (334) is provided at the lower end, the hot inlet (333) is connected to the upper opening (321), the hot outlet (334) is connected to the bottom box (31), and the bottom box (31) is connected to the lower air duct (24).

3. The exhaust gas treatment system for lost foam casting according to claim 2, characterized in that: The catalytic combustion mechanism (34) comprises a catalytic element (341) and a placement plate (342) for placing the catalytic element (341); a heating element (343) is provided below the placement plate (342); the placement plate (342) and the heating element (343) are both fixed in the catalytic box (32); and the catalytic combustion mechanism (34) is provided in multiple groups.

4. The exhaust gas treatment system for lost foam casting according to claim 1, characterized in that: The adsorption mechanism (5) comprises a partition (51) arranged in the middle box chamber (222) and an adsorption filter cartridge (52) arranged on the lower side of the partition (51); the partition (51) is provided with a through hole (511) for the intermediate rod (226) to pass through; a plurality of connecting pipes (512) are passed through the lower side of the partition (51); the connecting pipes (512) are detachably connected to the adsorption filter cartridge (52), and the connecting pipes (512) are in communication with the inner cavity of the adsorption filter cartridge (52); and a closed bottom plate (53) is provided at the lower end of the adsorption filter cartridge (52).

5. The exhaust gas treatment system for lost foam casting according to claim 4, characterized in that: A connecting frame (54) is provided on the inner side of the adsorption filter cartridge (52); the lower end of the connecting frame (54) is fixed to the closed bottom plate (53); the upper end of the connecting frame (54) is provided with an outer sleeve (55); the upper end of the side wall of the outer sleeve (55) is provided with an L-shaped groove (551); and the outer side of the connecting pipe (512) is provided with a clamping rod (513) matching the L-shaped groove (551).

6. The exhaust gas treatment system for lost foam casting according to claim 2, characterized in that: The bottom box (31) is provided with a first exhaust pipe (311) and a first on-off member (312) for controlling the on-off of the first exhaust pipe (311); a front connecting air box (3111) is provided at one end of the first exhaust pipe (311) away from the bottom box (31); the front connecting air box (3111) is connected to a radiator (6); a rear connecting air box (61) is provided at an output end of the radiator (6); the rear connecting air box (61) is connected to a hot air blower (611); and the output end of the hot air blower (611) is connected to a lower air duct (24).

7. The exhaust gas treatment system for lost foam casting according to claim 6, characterized in that: The rear connecting gas box (61) and the front connecting gas box (3111) are connected via a gas mixing box (612); a second exhaust pipe (313) and a second on-off member (314) for controlling the on-off of the second exhaust pipe (313) are provided on the bottom box (31); an end of the second exhaust pipe (313) away from the bottom box (31) is connected to the gas mixing box (612).

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