Volatile organic exhaust gas purification apparatus and method thereof

Abstract

The present invention provides a volatile organic exhaust gas purification apparatus and a purification method thereof. [Solution] The volatile organic exhaust gas purification apparatus connects the housing and the heat exchange unit via a pipeline, and has a low-temperature bypass pipe whose one end is connected to the exhaust gas supply pipe and whose other end is connected to the passage between the upstream pipe and the downstream pipe. At least one of the exhaust gas supply pipe and the low-temperature bypass pipe is provided with a valve to control the gas flow rate. Since the point where the organic exhaust gas is introduced into the heat exchange unit from the low-temperature bypass pipe is located in the passage between the upstream pipe and the downstream pipe, the temperature of the organic exhaust gas in the passage is lower than the temperature when it is released from the downstream pipe, resulting in a smaller pressure difference. This allows the opening of the control valve to be stably controlled, ensuring that the organic exhaust gas is stably introduced into the passage from the low-temperature bypass pipe and the upstream pipe and mixed uniformly, thus avoiding structural damage to the structural materials of the downstream pipe due to excessively high airflow temperature.

Description

Technical Field

[0001] The present invention relates to the purification treatment of organic exhaust gas, and particularly to a volatile organic exhaust gas purification treatment device and its purification treatment method.

Background Art

[0002] Volatile organic compounds (VOCs) generated in industrial manufacturing processes, for example, exhaust gas generated by using organic solvents in semiconductor manufacturing processes, must be purified. For example, after concentrating the exhaust gas through a process of adsorbing and desorbing the organic exhaust gas by a concentrator, it is sent to an incinerator and burned to be purified into water and carbon dioxide before being discharged, thereby avoiding environmental pollution.

[0003] Conventional volatile organic exhaust gas purification treatment devices achieve a preheating temperature (between about 500°C and 580°C) by passing the organic exhaust gas through a heat exchanger, and then send it into an incinerator to be burned and purified. However, if the temperature of the organic exhaust gas sent out from the heat exchanger cannot be controlled, the temperature may become too high (for example, the preheating temperature rises above 600°C). In this case, not only the airtight materials and structures of the furnace head of the incinerator are damaged, but also for the structure of the heat exchanger, for example, the fixing bolts used in the assembly of the flange, even if refractory steel that can withstand heat up to 600°C is used, thermal deformation due to overheating and a decrease in yield stress occur, and structural damage to the heat exchanger is likely to occur.

[0004] To solve the above problem, conventional technology involves bypassing the low-temperature side gas by mixing the low-temperature organic exhaust gas with the high-temperature organic exhaust gas after heat exchange to cool it down before sending it to the incinerator for purification. However, in reality, the point where the heat exchanger and the bypass pipe connect is in the section where the organic exhaust gas reaches the preheating temperature and is pre-sent to the incinerator. In this case, the bypass pipe is at the discharge end of the heat exchanger, and because the preheating temperature is high, the pressure difference becomes large, making it difficult to stably control the discharge flow rate of the organic exhaust gas. As a result, the temperature of the organic exhaust gas sent from the heat exchanger to the incinerator cannot be effectively reduced, and the heat exchanger is still prone to the aforementioned structural damage problem.

[0005] Therefore, solving the problems of the prior art described above is a major focus of this invention. [Overview of the project]

[0006] To solve the above problems, the present inventors provide a volatile organic exhaust gas purification apparatus and a purification method thereof that can stably control the organic exhaust gas introduced into the heat exchange unit from the low-temperature bypass pipe so that the organic exhaust gas passing through the heat exchange unit can be effectively cooled before it is released.

[0007] To achieve the above objective, the present invention provides a volatile organic exhaust gas purification apparatus comprising a housing, a heat exchange unit, and a low-temperature bypass pipe, wherein the housing has a heat exchange chamber and has an intake port and an outlet connecting the heat exchange chamber, a heat source is introduced into the heat exchange chamber through the intake port and discharged from the outlet, the heat exchange unit is provided in the housing and located within the heat exchange chamber and includes a case in which a U-shaped pre-stage pipe and a post-stage pipe are arranged, a heat absorption structure is arranged outside the pre-stage pipe and the post-stage pipe, the pre-stage pipe has a first intake end and a first exhaust end at both ends, the post-stage pipe has a second intake end and a second exhaust end at both ends, the first intake end is connected to and communicates with an exhaust gas supply pipe, the first exhaust end and the second intake end communicate with each other in a passage formed in the case, the second exhaust end is connected to an exhaust gas discharge pipe, and the organic exhaust gas is discharged through the exhaust gas supply pipe The present invention provides a volatile organic exhaust gas purification apparatus, wherein the organic exhaust gas passes through the first intake end and enters the upstream pipe, is introduced into the passage via the first exhaust end, then enters the downstream pipe from the second intake end, passes through the second exhaust end, and is discharged from the exhaust gas discharge pipe, the low-temperature side bypass pipe has a first end connected to and communicating with the exhaust gas supply pipe, and a second end connected to the case and communicating directly with the passage, and a control valve is provided in at least one of the low-temperature side bypass pipe and the exhaust gas supply pipe, and when it is detected that the airflow temperature of the organic exhaust gas from the exhaust gas discharge pipe exceeds a set threshold, the control valve is opened, a portion of the organic exhaust gas in the exhaust gas supply pipe is directly introduced into the passage via the low-temperature side bypass pipe and mixed with the organic exhaust gas introduced into the passage from the first exhaust end, thereby pre-cooling the organic exhaust gas as it passes through the downstream pipe, and maintaining the airflow temperature below the set threshold.

[0008] In one embodiment, the system further includes a concentration unit provided with an adsorption region and a desorption region. In the first stage, the organic exhaust gas passes through the adsorption region and is adsorbed onto an adsorbent at room temperature before being purified and discharged. In the second stage, the organic exhaust gas passes through the desorption region and is mixed with preheated air to concentrate and desorb organic matter. The exhaust gas then enters a heat exchange unit from the exhaust gas supply pipe to perform heat exchange.

[0009] In one embodiment, the heat exchange unit further includes a first preheating tube that is U-shaped and has a third intake end and a third exhaust end, a desorption intake tube connected between the third exhaust end and the desorption region of the concentration unit, and the organic exhaust gas enters the first preheating tube from the third intake end and is preheated to a first temperature, after which it is introduced into the desorption intake tube and passes through the desorption region.

[0010] In one embodiment, the heat exchange unit further includes a second preheating tube that is U-shaped and has a fourth intake end and a fourth exhaust end, the fourth intake end and the fourth exhaust end being connected in parallel in the middle of an exhaust gas supply pipe, and when the organic exhaust gas enters the exhaust gas supply pipe, it enters the second preheating tube from the fourth intake end and is preheated to a second temperature, then flows out through the fourth exhaust end and returns to the exhaust gas supply pipe and is introduced to the first intake end.

[0011] In one embodiment, the housing further includes an incineration unit located in a combustion chamber, the exhaust gas discharge pipe and the intake port are in communication with each other within the combustion chamber, the organic exhaust gas enters the combustion chamber from the exhaust gas discharge pipe, the organic matter contained therein is incinerated by the incineration unit and purified as high-temperature gas, and the high-temperature gas is used as the heat source, passing through the intake port and the heat exchange chamber to exchange heat with the heat exchange unit.

[0012] In one embodiment, a flow guide is provided at a point in the low-temperature bypass pipe that leads to the passage, and the organic exhaust gas that enters the passage from the low-temperature bypass pipe is guided by the flow guide to at least one of the first exhaust end and the second intake end, thereby uniformly mixing the low-temperature organic exhaust gas introduced from the low-temperature bypass pipe in the passage with the high-temperature organic exhaust gas introduced from the first exhaust end, effectively cooling it down, and then being discharged from the second intake end to the downstream pipe.

[0013] In one embodiment, the flow guide is a movable member and is provided at the second end of the low-temperature side bypass pipe, and the flow guide selectively directs towards the second intake end.

[0014] In one embodiment, the heat exchange unit has a flow guide wall in the passage that is inclined above the first exhaust end, and the position of the second end of the low-temperature side bypass pipe that is in direct communication with the passage is above the second intake end, and the high-temperature organic exhaust gas introduced into the passage from the first exhaust end is guided by the flow guide wall and flows to the second end of the low-temperature side bypass pipe, where it is uniformly mixed with the lower-temperature organic exhaust gas introduced into the passage from the second end to effectively cool down, and is then introduced into the downstream pipe from the second intake end.

[0015] The present invention includes an exhaust gas preheating step in which the heat source passes through the heat exchange chamber and exchanges heat with the heat absorption structure, preheating the organic exhaust gas flowing through the upstream pipe; an overheat detection step in which the airflow temperature of the organic exhaust gas discharged from the exhaust gas discharge pipe is detected and compared with a set threshold, and if the detected airflow temperature is less than or equal to the set threshold, the control valve is closed, the entire organic exhaust gas is preheated by the upstream pipe, and then introduced from the first exhaust end through the passage to the downstream pipe, and thereafter the organic matter contained is purified; and if the detected airflow temperature is less than or equal to the set threshold The present invention further provides a purification method for the volatile organic exhaust gas purification apparatus, which includes a superheating and cooling step in which, if the temperature exceeds a certain threshold, the control valve is opened and the degree of opening of the control valve is controlled according to the difference between the airflow temperature and the set threshold, the portion of the organic exhaust gas flowing to the first intake end in the exhaust gas supply pipe that has not been preheated by the preceding pipe is directly introduced into the passage from the low-temperature side bypass pipe, mixed with the organic exhaust gas introduced into the passage from the first exhaust end, the organic exhaust gas in the passage is cooled down and then introduced into the subsequent pipe, and thereafter the organic matter contained therein is purified.

[0016] In one embodiment, the opening degree of the control valve is 25% to 75%.

[0017] As a result, according to the volatile organic exhaust gas purification apparatus and purification method of the present invention, by stably introducing the organic exhaust gas that has passed through the upstream pipe and the low-temperature bypass pipe into the passage and mixing it uniformly, it is possible to ensure that thermal deformation and a decrease in yield stress do not occur in the heat exchange unit due to overheating of the organic exhaust gas that has passed through, thereby effectively extending the service life of the purification apparatus and its heat exchange unit. [Brief explanation of the drawing]

[0018] [Figure 1] This is a schematic diagram of the system architecture of the first embodiment of the present invention. [Figure 2] Figure 1 is an enlarged view of the housing, heat exchange unit, and low-temperature side bypass tube. [Figure 3] Figure 1 is a three-dimensional enlarged schematic diagram of the concentration unit. [Figure 4] This is a schematic diagram of the first embodiment of the present invention, in which the low-temperature side bypass pipe is provided with a flow guide section at the second end and communicates with the passage. [Figure 5] This is a flowchart of a volatile organic exhaust gas purification treatment method, a specific embodiment of the present invention. [Figure 6] This is a schematic diagram of the system architecture of a second embodiment of the present invention. [Figure 7] This is a schematic diagram of the system architecture of the third embodiment of the present invention. [Figure 8] This is a schematic diagram of the system architecture of the fourth embodiment of the present invention. [Figure 9] This is a schematic diagram of the system architecture of the fifth embodiment of the present invention. [Figure 10] This is a schematic diagram of the system architecture of the sixth embodiment of the present invention. [Modes for carrying out the invention]

[0019] In order to fully understand the purpose, features, and effects of the present invention, the present invention will be described in detail with reference to the attached drawings, using the following specific examples. The description is as follows.

[0020] Referring to FIGS. 1 to 10, the present invention provides a volatile organic exhaust gas purification treatment device 100. The volatile organic exhaust gas is mainly a gas volatilized from an organic solvent, and is commonly seen in the industrial manufacturing process environments such as the electronics industry, the surface coating industry, the packaging material printing industry, the adhesive tape industry, the copper foil substrate industry, the PU / PVC leather industry, and the petrochemical industry. The volatile organic compounds (VOCs) contained therein are toxic and harmful to the body, so purification treatment is necessary.

[0021] As shown in FIGS. 1 to 4 which are the first embodiment, the volatile organic exhaust gas purification treatment device 100 of the present invention includes a housing 10, a heat exchange unit 20, and a low-temperature side bypass pipe 30.

[0022] As shown in FIGS. 1 and 2, the housing 10 has a heat exchange chamber 11, and an air inlet 111 and an air outlet 112 for communicating with the heat exchange chamber 11. One heat source H is introduced into the heat exchange chamber 11 through the air inlet 111 and discharged from the air outlet 112. In one embodiment, the housing 10 is provided with a combustion chamber 14 near the heat exchange chamber 11.

[0023] As shown in Figures 1 and 2, the heat exchange unit 20 is provided in the housing 10 and located within the heat exchange chamber 11, and includes a case 21. Inside the case 21 are a U-shaped pre-stage pipe 22 and a post-stage pipe 23, and a heat absorption structure 24 is located outside the pre-stage pipe 22 and the post-stage pipe 23. The heat absorption structure 24 here is composed of, for example, a metal plate, a pipe bundle, a finned pipe, or fins, and in this embodiment it is a stainless steel pipe. When the heat source H passes through the heat exchange chamber 11, the thermal energy is conducted to the pre-stage pipe 22 and the post-stage pipe 23 by the heat absorption structure 24, thereby preheating the gas passing through the pre-stage pipe 22 and the post-stage pipe 23. In one embodiment, as shown in Figure 2, the heat source H passes through the intake port 111, the heat exchange chamber 11, and is discharged from the outlet port 112. In this process, it passes through the downstream pipe 23, the upstream pipe 22, and the two first preheating pipes 26 in sequence. That is, the temperature of the heat source H is highest when it passes through the downstream pipe 23, and after heat is absorbed by the upstream pipe 22 and the first first preheating pipe 26, its temperature is lowest when it passes through the second first preheating pipe 26.

[0024] As shown in Figure 2, the front pipe 22 has a first intake end 221 and a first exhaust end 222 at both ends, and the rear pipe 23 has a second intake end 231 and a second exhaust end 232 at both ends. A passage 25 is also formed inside the case 21 (as shown in Figure 2), and the first exhaust end 222 and the second intake end 231 communicate with each other within the passage 25. The first intake end 221 is connected to the exhaust gas supply pipe 12, and the second exhaust end 232 is connected to the exhaust gas discharge pipe 13. The organic exhaust gas enters the front pipe 22 via the exhaust gas supply pipe 12, which is equipped with a fan 121 to assist the airflow, passes through the first intake end 221, and is introduced into the passage 25 via the first exhaust end 222. After that, it enters the rear pipe 23 from the second intake end 231, passes through the second exhaust end 232, and is discharged from the exhaust gas discharge pipe 13.

[0025] As shown in Figure 2, the low-temperature side bypass pipe 30 has a first end 31 that is connected to and communicates with the exhaust gas supply pipe 12, and a second end 32 that is connected to the case 21 and communicates directly with the passage 25. A control valve 40 is provided in at least one of the low-temperature side bypass pipe 30 and the exhaust gas supply pipe 12. In one embodiment, as shown in Figure 2, the control valve 40 is provided in the low-temperature side bypass pipe 30. When the control valve 40 is closed, organic exhaust gas cannot pass through the low-temperature side bypass pipe 30, and when the control valve 40 is open, organic exhaust gas can pass through the low-temperature side bypass pipe 30 depending on the opening degree of the control valve 40. The opening degree of the control valve 40 is, for example, between 25% and 75%, and in one embodiment, it is preferably between 40% and 60% (for example, 50%).

[0026] When it is detected that the airflow temperature of the organic exhaust gas from the exhaust gas discharge pipe 13 exceeds a set threshold, the control valve 40 is opened, and a portion of the organic exhaust gas in the exhaust gas supply pipe 12 (65°C organic exhaust gas as shown in Figure 2) is directly introduced into the passage 25 via the low-temperature bypass pipe 30 and mixed with the organic exhaust gas (approximately 300°C as shown in Figure 2) introduced into the passage 25 from the first exhaust end 222. As a result, the organic exhaust gas is cooled before passing through the downstream pipe 23, and the airflow temperature is maintained below the set threshold. In one embodiment, the setting threshold may be set between 480°C and 580°C. Assuming that 560°C is the default value, if the temperature of the organic exhaust gas when it is introduced from the downstream pipe 23 to the exhaust gas discharge pipe 13 exceeds 560°C, that is, if the temperature of the organic exhaust gas exceeds the default value of the setting threshold and reaches, for example, 580°C, the control valve 40 is opened, and the 65°C organic exhaust gas in the exhaust gas supply pipe 12 is directly introduced into the passage 25 via the low-temperature bypass pipe 30. After mixing with the organic exhaust gas introduced into the passage 25 from the upstream pipe 22 at approximately 300°C, it cools down, and as a result, the temperature when it is introduced into the exhaust gas discharge pipe 13 via the downstream pipe 23 can be stably maintained at 560°C without overheating.

[0027] As described above, assuming the organic exhaust gas is at 65°C, if it enters directly into the second exhaust end 232 or the exhaust gas discharge pipe 13 (see Figure 2) via the low-temperature bypass pipe 30 and mixes with the organic exhaust gas that has reached 580°C, the temperature difference between the cold and hot airflow will be excessive, resulting in uneven mixing and making thermal deformation likely. Furthermore, the temperature of the organic exhaust gas introduced into the exhaust gas discharge pipe 13 via the downstream pipe 23 is likely to exceed 600°C, thus reducing the yield strength. For example, components such as the flange used in the heat exchange unit 20 and the fixing bolts for its assembly (made of fire-resistant steel capable of withstanding up to 600°C, not shown) may have their structural strength weakened, posing a safety risk of structural failure, which is precisely the problem that the present invention aims to avoid.

[0028] In one embodiment, as shown in Figures 1 and 2, an incineration unit 50 is further included, which is located within the combustion chamber 14, and the exhaust gas discharge pipe 13 and the intake port 111 are in communication with each other within the combustion chamber 14. The organic exhaust gas, preheated by the downstream pipe 23, enters the combustion chamber 14 via the exhaust gas discharge pipe 13. At this time, the furnace head 51 of the incineration unit 50 provides a ignition source, incinerating the contained organic matter to purify it as a high-temperature gas (which can reach a temperature of 732°C). This high-temperature gas is then used as a heat source H, passing through the intake port 111 and the heat exchange chamber 11 to perform the heat exchange with the heat exchange unit 20.

[0029] In one embodiment, as shown in Figure 1, the system further includes a concentration unit 60 provided with an adsorption region 61 and a desorption region 62 (as shown in Figure 3). In the first stage, the organic exhaust gas passes through the adsorption region 61 and is adsorbed onto an adsorbent at room temperature before being purified and discharged. In the second stage, the organic exhaust gas passes through the desorption region 62 and is mixed with preheated air to concentrate and desorb organic matter, and then enters a heat exchange unit 20 from the exhaust gas supply pipe 12 to perform heat exchange.

[0030] In one embodiment, as shown in Figure 1, the concentration unit 60 includes a rotating wheel 60A and a rotating wheel 60B, but the present invention is not limited to a double rotating wheel and may also include a single rotating wheel. The concentration unit 60 is provided with a fan 63 and a fan 64. The fan 63 helps the organic exhaust gas return to the adsorption region 61 of the rotating wheel 60A after passing through the desorption region 62 of the rotating wheel 60B, and the fan 64 helps the organic exhaust gas that has passed through the adsorption region 61 of the rotating wheel 60A to further pass through the adsorption region 61 of the rotating wheel 60B.

[0031] In one embodiment, as shown in Figure 2, the heat exchange unit 20 further includes two first preheating tubes 26, each of which is U-shaped and has a third intake end 261 and a third exhaust end 262. Here, the two first preheating tubes 26 each connect the third exhaust end 262 to the decomposition areas 62 of the rotating wheels 60A and 60B via a decomposition intake tube 263. The organic exhaust gas enters the first preheating tube 26 from the third intake end 261, is preheated to a first temperature, is then introduced into the decomposition intake tube 263, and passes through the decomposition areas 62 of the rotating wheels 60A and 60B.

[0032] In one embodiment, as shown in Figure 2, the heat exchange unit 20 has a flow guide wall 251 inclined above the first exhaust end 222 within the passage 25, and the position where the second end 32 of the low-temperature side bypass pipe 30 directly communicates with the passage 25 is above the second intake end 231. The high-temperature organic exhaust gas introduced into the passage 25 from the first exhaust end 222 is guided by the flow guide wall 251 and flows to the second end 32 of the low-temperature side bypass pipe 30, where it is uniformly mixed with the lower-temperature organic exhaust gas introduced into the passage 25 from the second end 32 to effectively cool down, and is then introduced into the downstream pipe 23 from the second intake end 231.

[0033] In one embodiment, as shown in Figure 4, a flow guide 33 is provided at the point where the low-temperature bypass pipe 30 leads to the passage 25, and the organic exhaust gas entering the passage 25 from the low-temperature bypass pipe 30 is guided by the flow guide 33 to at least one of the first exhaust end 222 and the second intake end 231, thereby uniformly mixing the low-temperature organic exhaust gas introduced from the low-temperature bypass pipe 30 in the passage 25 with the high-temperature organic exhaust gas introduced from the first exhaust end 222, effectively cooling it down, and then being discharged to the downstream pipe 23 from the second intake end 231. In one embodiment, the flow guide 33 may be a fixed member or a movable member provided at the second end 32 of the low-temperature bypass pipe 30. If the flow guide 33 is a movable member, the flow direction of the organic exhaust gas introduced into the passage 25 can be adjusted, for example, the flow guide 33 shown in Figure 4 selectively directs towards the second intake end 231.

[0034] According to the volatile organic exhaust gas purification treatment apparatus 100, the present invention further provides a purification treatment method 200 that includes the steps of exhaust gas preheating 201, overheat detection 202, overheat cooling 203, and gas purification 204, as shown in Figure 5 (see Figure 2).

[0035] In the exhaust gas preheating step 201, the heat source H exchanges heat with the heat absorption structure 24 via the heat exchange chamber 11, preheating the organic exhaust gas flowing through the pre-stage pipe 22. In one embodiment, the temperature of the organic exhaust gas flowing through the exhaust gas supply pipe 12 is measured to be 65°C, and the temperature when it is introduced into the passage 25 after being preheated by the pre-stage pipe 22 is measured to be approximately 300°C.

[0036] In the overheat detection step 202, the airflow temperature of the organic exhaust gas discharged from the exhaust gas discharge pipe 13 is detected (for example, by a temperature sensor) and compared with a set threshold of 560°C. If the detected airflow temperature is below the set threshold, the control valve 40 is closed, and the entire organic exhaust gas is preheated by the upstream pipe 22 before being introduced from the first exhaust end 222 through the passage 25 to the downstream pipe 23, after which the contained organic matter is purified.

[0037] In the superheating and cooling step 203, if the detected airflow temperature of the organic exhaust gas discharged from the exhaust gas discharge pipe 13 exceeds the set threshold of 560°C, the control valve 40 is opened, and the opening degree of the control valve 40 is controlled according to the difference between the airflow temperature and the set threshold (50% is used as an example). The portion of the organic exhaust gas flowing to the first intake end 221 in the exhaust gas supply pipe 12 that has not been preheated by the preceding pipe 22 (current temperature is 65°C) is directly introduced into the passage 25 from the low-temperature bypass pipe 30. This mixture is then combined with the organic exhaust gas introduced into the passage 25 from the first exhaust end 222 (current temperature is approximately 300°C), the organic exhaust gas in the passage 25 is cooled, and then introduced into the subsequent pipe 23. After that, the organic matter contained in the mixture is purified. In this embodiment, the organic exhaust gas is preheated to a set threshold of 560°C or less by the downstream pipe 23, introduced into the combustion chamber 14 via the exhaust gas discharge pipe 13, and the contained organic matter is incinerated by the incineration unit 50 to purify it as high-temperature gas (which can reach a temperature of 732°C). This high-temperature gas is then introduced into the heat exchange chamber 11 from the intake port 111 for recovery and reuse. After the superheating and cooling step 203, the gas purification step 204 is performed, for example, the organic exhaust gas is sent to the incineration unit 50, burned to purify it into water and carbon dioxide, and then discharged.

[0038] The following features of the present invention will be easier to discover from the above description.

[0039] 1. In the volatile organic exhaust gas purification apparatus 100 and its purification method 200 of the present invention, the low-temperature side bypass pipe 30 and the heat exchange unit 20 are connected in the passage 25 between the preceding pipe 22 and the subsequent pipe 23. As a result, the organic exhaust gas in the passage 25 is preheated only by the preceding pipe 22, and its temperature is lower than the temperature further preheated by the subsequent pipe 23. Therefore, the pressure difference due to the temperature difference between the low-temperature side bypass pipe 30 and the passage 25 can be made relatively small. This allows the opening degree of the control valve 40 to be stably controlled, and the organic exhaust gas that has passed through the preceding pipe 22 and the low-temperature side bypass pipe 30 can be stably introduced into the passage 25 and mixed uniformly. This avoids the problem of excessive temperature difference in the cold airflow and uneven mixing that can occur if the low-temperature side bypass pipe 30 directly enters the second exhaust end 232 or the exhaust gas discharge pipe 13 side. Furthermore, it is possible to ensure that thermal deformation and a decrease in yield strength do not occur in the heat exchange unit 20 due to overheating of the organic exhaust gas that passes through it, thereby avoiding structural damage to the heat exchanger and effectively extending the service life of the heat exchange unit 20. For example, if the heat exchange unit 20 is assembled with fixing bolts made of fire-resistant steel that can withstand up to 600°C, then by setting the threshold value to 560°C as described above, the flange and fixing bolts will not undergo thermal deformation and a decrease in yield strength due to overheating, thereby avoiding structural safety risks and preventing the problem of high-temperature gas leaking due to the breakdown of airtightness at the flange joint.

[0040] Furthermore, if the organic exhaust gas (65°C) flowing through the low-temperature bypass pipe 30 contains high-boiling point volatile organic substances (VOCs) or any combination thereof that generate droplets of high-boiling point organic solvents, such as N-methylpyrrolidone (NMP), dimethylformamide (DMF), dimethylamine (DMA), and trimethylamine (TMA), monoethanolamine (MEA), dimethyl sulfoxide (DMSO), or propylene glycol methyl ether acetate (PGMEA), or if it contains viscous organic compounds, when it enters directly into the second exhaust end 232 or exhaust gas discharge pipe 13 and mixes with the organic exhaust gas (580°C) there, the 65°C low-temperature organic exhaust gas comes into contact with the 580°C high-temperature organic exhaust gas at the junction of the low-temperature bypass pipe 30 and the second exhaust end 232 or exhaust gas discharge pipe 13 and vaporizes instantaneously. As a result, in mild cases, the airflow stability of the organic exhaust gas passing through the section of the furnace head 51 decreases, and in severe cases, the rapid expansion of the gas volume in a limited area can cause the temperature of the organic exhaust gas to rise above the typical autoignition temperature (where the typical autoignition temperature is between 450°C and 600°C), potentially causing a gas explosion and leading to a serious industrial safety hazard. To solve this problem, in the present invention, the low-temperature side bypass pipe is connected to the case 21 via the second end 32 and communicates directly with the passage 25, so that the temperature of the organic exhaust gas introduced from the upstream pipe 22 into the passage 25 (approximately 300°C) is lower than the temperature of the organic exhaust gas introduced from the downstream pipe 23 into the exhaust gas discharge pipe 13 (580°C), thereby reducing the temperature difference at the confluence of the organic exhaust gases and improving airflow control capability. Furthermore, if the organic exhaust gas flowing out from the low-temperature bypass pipe 30 contains organic droplets or viscous organic compounds, the organic exhaust gas (65°C) enters the passage 25 and mixes with organic exhaust gas (approximately 300°C) whose temperature is lower than the typical autoignition temperature. This significantly reduces the occurrence of the phenomenon where droplets instantly vaporize, thereby mitigating the risk of a gas explosion due to rapid expansion of gas volume.

[0041] 2. The heat exchange unit 20 may have a guide wall 251 provided in the passage 25 at an angle above the first exhaust end 222. The organic exhaust gas introduced into the passage 25 from the first exhaust end 222 can be guided by the guide wall 251 and flow to the second end 32 of the low-temperature bypass pipe 30. This concentrates and thoroughly mixes the organic exhaust gas introduced into the passage 25 from the first exhaust end 222 and the organic exhaust gas introduced into the passage 25 from the second intake end 231. This ensures that the organic exhaust gas in the passage 25 is uniformly mixed and effectively cooled when introduced into the downstream pipe 23. In this way, the organic exhaust gas can avoid the problem of uneven mixing due to excessive temperature differences in the cold and hot airflows, and it is also possible to ensure that thermal deformation and a decrease in yield stress do not occur in the heat exchange unit 20 due to overheating of the organic exhaust gas that has passed through, thereby avoiding structural damage to the heat exchanger.

[0042] 3. The heat exchange unit 20 may have a flow guide section 33 at the second end 32 of the low-temperature side bypass pipe 30. This flow guide section 33 may be fixed or adjustable movable. This allows the organic exhaust gas introduced into the passage 25 from the first exhaust end 222 to be thoroughly mixed with the lower-temperature organic exhaust gas introduced into the passage 25 from the second end 32 before entering the second intake end 231 of the downstream pipe 23, thereby achieving uniform mixing and effective cooling. Furthermore, if the flow guide section 33 is a movable member, the direction of the flow of organic exhaust gas introduced into the passage 25 via the low-temperature side bypass pipe 30 can be adjusted, which is advantageous for more flexible application of the organic exhaust gas in the passage 25 during mixing and cooling.

[0043] Figure 6 shows a purification apparatus 100 according to a second embodiment of the present invention, the main differences from the first embodiment are as follows. This embodiment is a simplified version of the purification apparatus 100 of the first embodiment, the concentration unit 60 of this embodiment has only one rotating wheel, and in this embodiment only one first preheating tube 26 is provided, and the opening / closing of the control valve 40 in this embodiment can be controlled according to the temperature sensed by temperature sensors TE1 and TE2, and the control of the control valve 40 is as described in the first embodiment, so a detailed explanation is omitted here. As a result, in this embodiment the organic exhaust gas introduced into the passage 25 from the first exhaust end 222 is approximately 300°C, and in this embodiment as well, the effect can be obtained that the organic exhaust gas discharged from the exhaust gas discharge pipe 13 at the end is 560°C, which is the set threshold.

[0044] Figure 7 shows a purification treatment apparatus 100 according to a third embodiment of the present invention, the main differences from the first embodiment described above are as follows. The heat exchange unit 20 further includes a second preheating tube 27 which is U-shaped and has a fourth intake end 271 and a fourth exhaust end 272, the fourth intake end 271 and the fourth exhaust end 272 are connected in parallel in the middle of the exhaust gas supply pipe 12, and when the organic exhaust gas enters the exhaust gas supply pipe 12, it enters the second preheating tube 27 from the fourth intake end 271, is preheated to a second temperature, flows out through the fourth exhaust end 272, returns to the exhaust gas supply pipe 12 and is introduced to the first intake end 221. As a result, the organic exhaust gas in the exhaust gas supply pipe 12 can be preheated to 150°C after passing through the second preheating pipe 27. Furthermore, the organic exhaust gas introduced from the first intake end 221 to the preceding pipe 22 and then from the first exhaust end 222 to the passage 25 is at approximately 350°C. Therefore, in this embodiment, the effect can be obtained in that the organic exhaust gas finally released from the exhaust gas discharge pipe 13 is also at the set threshold of 560°C.

[0045] In the heat exchange unit 20, a temperature sensor TE1 is provided between the intake port 111 and the combustion chamber 14, and a temperature sensor TE2 is positioned at the exhaust gas discharge pipe 13. The temperature of the organic exhaust gas introduced from the combustion chamber 14 into the heat exchange chamber 11 is detected by the temperature sensor TE1, and the temperature (TIC) of the organic exhaust gas flowing through the exhaust gas discharge pipe 13 is detected by the temperature sensor TE2. The control valve 40 (similarly provided in the low-temperature bypass pipe 30 in this embodiment) is electrically connected to the temperature sensors TE1 and TE2, respectively, and the temperature sensor TE2 can detect whether the temperature of the organic exhaust gas in the exhaust gas discharge pipe 13 exceeds the limit.

[0046] Figure 8 shows a purification treatment apparatus 100 according to the fourth embodiment of the present invention, and the main differences from the first embodiment are as follows. The heat exchange unit 20 is provided with a second preheating pipe 27, similar to the third embodiment, and in this embodiment, a control valve 40A is provided in the main pipeline of the exhaust gas supply pipe 12, and another control valve 40B is provided in the manifold of the exhaust gas supply pipe 12 that leads to the second preheating pipe 27. In addition, a control valve 40C is provided in the low-temperature side bypass pipe 30, and the opening / closing of the control valves 40A, 40B and 40C in this embodiment can be controlled according to the temperature sensed by temperature sensors TE1 and TE2. Of these, the control of control valve 40C is the same as that of control valve 40 described in the first embodiment, and a detailed explanation is omitted here. In this embodiment, by closing control valve 40A and opening control valve 40B, the organic exhaust gas enters the pre-stage pipe 22 from the first intake end 221 after passing through the second preheating pipe 27. By closing control valve 40B and opening control valve 40A, the organic exhaust gas enters the pre-stage pipe 22 from the first intake end 221 without passing through the second preheating pipe 27. The organic exhaust gas introduced into the passage 25 from the first exhaust end 222 is approximately 325°C. Therefore, in this embodiment as well, the effect of having the organic exhaust gas discharged from the exhaust gas discharge pipe 13 at the set threshold of 560°C can be obtained.

[0047] Figure 9 shows a purification treatment apparatus 100 according to the fifth embodiment of the present invention, and the main differences from the first embodiment are as follows. The heat exchange unit 20 is provided with a second preheating pipe 27, similar to the third and fourth embodiments, and in this embodiment, a control valve 40B is provided in the manifold of the exhaust gas supply pipe 12 that leads to the second preheating pipe 27. In addition, a control valve 40C is provided in the low-temperature side bypass pipe 30, and the opening / closing of the control valves 40B and 40C in this embodiment can be controlled according to the temperature sensed by temperature sensors TE1 and TE2. Of these, the control of the control valve 40C is the same as that of the control valve 40 described in the first embodiment, and a detailed explanation is omitted here. In this embodiment, by controlling the opening of the control valve 40B to 50%, the organic exhaust gas enters the pre-stage pipe 22 from the first intake end 221 via the second preheating pipe 27 at a flow rate of 50%, and the organic exhaust gas can reach 185°C when it enters the first intake end 221. Furthermore, when the control valve 40C is opened, the low-temperature bypass pipe 30 also introduces 65°C organic exhaust gas into the passage 25 at 50% flow rate. The organic exhaust gas introduced into the passage 25 from the first exhaust end 222 is approximately 365°C. Therefore, in this embodiment as well, the effect of having the organic exhaust gas discharged from the exhaust gas discharge pipe 13 at the set threshold of 560°C can be obtained.

[0048] Figure 10 shows a sixth embodiment of the present invention, a purification treatment apparatus 100, which is based on the fifth embodiment, but the control valve 40C in the fifth embodiment is omitted. In this case, by controlling the opening of the control valve 40B to 50%, the organic exhaust gas enters the pre-stage pipe 22 from the first intake end 221 via the second preheating pipe 27 at 50% flow rate, and the organic exhaust gas can reach 185°C when it enters the first intake end 221. In addition, the low-temperature side bypass pipe 30 of this embodiment does not have a control valve 40C, and the organic exhaust gas at 65°C is directly introduced into the passage 25 at 50% flow rate. The organic exhaust gas introduced into the passage 25 from the first exhaust end 222 is at approximately 365°C, and therefore, this embodiment also achieves the effect that the organic exhaust gas discharged from the exhaust gas discharge pipe 13 at the end is at the set threshold of 560°C.

[0049] Although the present invention has been disclosed above by preferred embodiments, those skilled in the art should understand that the embodiments are merely illustrative and should not be interpreted as limiting the scope of the invention. It should be noted that any equivalent modifications and substitutions in the embodiments are included within the scope of the invention. Therefore, the scope of protection of the present invention is limited to that of the claims. [Explanation of Symbols]

[0050] 100 Purification treatment equipment 200 Purification Treatment Methods 201 Exhaust gas preheating 202 Overheating detection 203 Overheating temperature drop 204 Gas purification 10 cabinets 11 Heat exchange room 111 Air intake 112 Discharge port 12 Exhaust gas supply pipe 121 Fans 13 Exhaust gas discharge pipe 14 Combustion chamber 20 Heat exchange unit 21 cases 22 Front pipe 221 First intake end 222 First exhaust end 23 Post-stage pipe 231 Second intake end 232 Second exhaust end 24 Heat absorption structure 25 aisles 251 Direction wall 26 1st preheating pipe 261 Third intake end 262 Third exhaust end 263 Detachable suction pipe 27 2nd preheating pipe 271 Fourth intake end 272 Fourth exhaust end 30 Low-temperature side bypass tube 31 1st end 32 2nd end 33 Direction section 40~40C Control valve 50 Incineration Units 51 Furnace Head 60 Concentration Units 60A, 60B Rotating Wheel 61 Adsorption area 62 Desorption area 63 Fans 64 Fans TE1, TE2 temperature sensors H heat source

Claims

1. A housing having a heat exchange chamber and an intake and discharge port connecting the heat exchange chamber, wherein a heat source is introduced into the heat exchange chamber through the intake port and discharged from the discharge port, A heat exchange unit comprising a case provided in the housing and located within the heat exchange chamber, the case having a U-shaped pre-stage pipe and a post-stage pipe, the heat absorption structure being arranged outside the pre-stage pipe and the post-stage pipe, the pre-stage pipe having a first intake end and a first exhaust end at both ends, the post-stage pipe having a second intake end and a second exhaust end at both ends, the first intake end being connected to and communicating with an exhaust gas supply pipe, the first exhaust end and the second intake end communicating with each other in a passage formed in the case, the second exhaust end being connected to an exhaust gas discharge pipe, and organic exhaust gas entering the pre-stage pipe via the exhaust gas supply pipe and the first intake end, being introduced into the passage via the first exhaust end, further entering the post-stage pipe from the second intake end, passing through the second exhaust end, and then being discharged from the exhaust gas discharge pipe. A low-temperature bypass pipe having a first end connected to and communicating with the exhaust gas supply pipe, and a second end connected to the case and communicating directly with the passage, wherein at least one of the low-temperature bypass pipe and the exhaust gas supply pipe is provided with a control valve, and when it is detected that the airflow temperature of the organic exhaust gas from the exhaust gas discharge pipe exceeds a set threshold, the control valve is opened, a portion of the organic exhaust gas in the exhaust gas supply pipe is directly introduced into the passage via the low-temperature bypass pipe, and mixed with the organic exhaust gas introduced into the passage from the first exhaust end, thereby causing the organic exhaust gas to cool down before passing through the downstream pipe, and maintaining the airflow temperature below the set threshold, A volatile organic exhaust gas purification treatment device, including a volatile organic exhaust gas treatment device.

2. The volatile organic exhaust gas purification apparatus according to claim 1, further comprising a concentration unit provided with an adsorption region and a desorption region, wherein the organic exhaust gas passes through the adsorption region in the first stage, is adsorbed onto an adsorbent at room temperature, and then purified and discharged; the organic exhaust gas passes through the desorption region in the second stage and is mixed with preheated air to concentrate and desorb organic matter; and further enters the heat exchange unit from the exhaust gas supply pipe to perform heat exchange.

3. The volatile organic exhaust gas purification apparatus according to claim 2, wherein the heat exchange unit further includes a first preheating tube that is U-shaped and has a third intake end and a third exhaust end, a desorption intake tube is connected between the third exhaust end and the desorption region of the concentration unit, and the organic exhaust gas enters the first preheating tube from the third intake end and is preheated to a first temperature, and then introduced into the desorption intake tube and passes through the desorption region.

4. The volatile organic exhaust gas purification apparatus according to claim 3, wherein the heat exchange unit further includes a second preheating tube that is U-shaped and has a fourth intake end and a fourth exhaust end, the fourth intake end and the fourth exhaust end being connected in parallel in the middle of the exhaust gas supply pipe, and when the organic exhaust gas enters the exhaust gas supply pipe, it enters the second preheating tube from the fourth intake end and is preheated to a second temperature, flows out through the fourth exhaust end, returns to the exhaust gas supply pipe and is introduced to the first intake end.

5. The volatile organic exhaust gas purification apparatus according to claim 1, further comprising an incineration unit located in a combustion chamber provided in the housing, wherein the exhaust gas discharge pipe and the intake port are in communication with each other within the combustion chamber, the organic exhaust gas enters the combustion chamber from the exhaust gas discharge pipe, the organic matter contained therein is incinerated by the incineration unit and purified as a high-temperature gas, and the high-temperature gas is used as the heat source, passing through the intake port and the heat exchange chamber to perform heat exchange with the heat exchange unit.

6. A volatile organic exhaust gas purification apparatus according to claim 1, wherein a flow guide is provided at a portion of the low-temperature bypass pipe that leads to the passage, and the organic exhaust gas that enters the passage from the low-temperature bypass pipe is guided by the flow guide to at least one of the first exhaust end and the second intake end, thereby uniformly mixing the low-temperature organic exhaust gas introduced from the low-temperature bypass pipe in the passage with the high-temperature organic exhaust gas introduced from the first exhaust end, effectively reducing its temperature, and is then discharged from the second intake end to the downstream pipe.

7. The volatile organic exhaust gas purification apparatus according to claim 6, wherein the flow guide is a movable member and is provided at the second end of the low-temperature side bypass pipe, and the flow guide selectively directs toward the second intake end.

8. The volatile organic exhaust gas purification apparatus according to claim 1, wherein the heat exchange unit has a flow guide wall provided in the passage and inclined above the first exhaust end, the position of the second end of the low-temperature bypass pipe that is in direct communication with the passage is above the second intake end, the high-temperature organic exhaust gas introduced into the passage from the first exhaust end is guided by the flow guide wall and flows to the second end of the low-temperature bypass pipe, where it is uniformly mixed with the low-temperature organic exhaust gas introduced into the passage from the second end to effectively cool down, and is further introduced into the downstream pipe from the second intake end.

9. The heat source passes through the heat exchange chamber and exchanges heat with the heat absorption structure, and preheats the organic exhaust gas flowing through the preceding pipe, in exhaust gas preheating, The airflow temperature of the organic exhaust gas discharged from the exhaust gas discharge pipe is detected and compared with a set threshold. If the detected airflow temperature is less than or equal to the set threshold, the control valve is closed, the entire organic exhaust gas is preheated by the upstream pipe, and then introduced from the first exhaust end through the passage to the downstream pipe. Subsequently, overheat detection is performed to purify the organic matter contained therein. If the detected airflow temperature exceeds the set threshold, the control valve is opened, and the opening degree of the control valve is controlled according to the difference between the airflow temperature and the set threshold, the portion of the organic exhaust gas flowing to the first intake end in the exhaust gas supply pipe that has not been preheated by the preceding pipe is directly introduced into the passage from the low-temperature bypass pipe, mixed with the organic exhaust gas introduced into the passage from the first exhaust end, the organic exhaust gas in the passage is cooled, and then introduced into the subsequent pipe, after which superheating and cooling is performed to purify the contained organic matter. A purification treatment method for a volatile organic exhaust gas purification treatment apparatus according to any one of claims 1 to 8, including the method described above.

10. The purification treatment method according to claim 9, wherein the opening degree of the control valve is 25% to 75%.

Images