A heat exchanger for VOCs recovery and treatment

Abstract

This utility model discloses a heat exchanger for VOCs recovery and treatment, comprising two heat exchange tubes, each with an open end and sealed connection to a distribution pipe. The upper and lower parts of the distribution pipes are respectively connected to a refrigerant outlet pipe and a refrigerant inlet pipe. The upper and lower parts of the heat exchange tubes are also respectively connected to an exhaust gas inlet pipe and an exhaust gas outlet pipe, with the exhaust gas outlet pipe of the upper heat exchange tube connected to the exhaust gas inlet pipe of the lower heat exchange tube. A heat exchange component is located in the middle of each heat exchange tube, with its inner cavity connected to the distribution pipe. The outer surface of the heat exchange component is located within the inner cavity of the heat exchange tube, for heat exchange with the exhaust gas. A condensate outlet pipe is connected to the lower part of each heat exchange tube. The refrigerant can continuously flow in this system, entering the distribution pipe from the refrigerant inlet pipe, then entering the heat exchange component, and finally flowing out through the refrigerant outlet pipe. This circulation design allows the refrigerant to fully exchange heat with the exhaust gas, improving the refrigerant utilization rate.

Description

Technical Field

[0001] This utility model belongs to the field of heat exchanger technology, and specifically relates to a heat exchanger for VOCs recovery and treatment. Background Technology

[0002] A heat exchanger is a device that transfers part of the heat from a hot fluid to a cold fluid. It is widely used in industrial production such as chemical, petroleum, power, and food industries. Its main function is to transfer heat from one fluid to another through a heat transfer medium, thereby realizing the exchange of heat energy. When a large amount of organic waste gas with a high concentration is generated in a factory, the organic waste gas is generally condensed by a low-temperature heat exchanger. By cooling the waste gas to below the dew point of the organic matter, the organic matter is condensed into liquid and recovered. This can treat organic chemical waste gas and effectively prevent the organic waste gas from spreading into the air and causing environmental pollution.

[0003] Current low-temperature heat exchangers for treating organic waste gas generally use shell-and-tube heat exchangers, using substances with low boiling points and high cooling effects, such as liquid ammonia and liquid oxygen, as heat exchange media. The heat exchange media circulates in the tubes, while the high-temperature organic chemical waste gas circulates in the heat exchanger. When the waste gas comes into contact with the tubes, it is cooled to below the dew point of the organic matter, causing the organic matter to condense into liquid and be recovered.

[0004] However, existing low-temperature heat exchangers have low efficiency in utilizing refrigerant temperature when cooling organic waste gas. Therefore, this application provides a heat exchanger for VOCs recovery and treatment to solve the above problems. Utility Model Content

[0005] This invention provides a heat exchanger for VOCs recovery and treatment, aiming to solve the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] A heat exchanger for VOCs recovery and treatment includes: two heat exchange tubes arranged vertically, each heat exchange tube having an open end and being sealed to a branch pipe; the upper and lower parts of the branch pipes are respectively connected to a refrigerant outlet pipe and a refrigerant inlet pipe, and adjacent refrigerant outlet pipes and refrigerant inlet pipes of the two branch pipes are connected; the upper and lower parts of the heat exchange tubes are respectively connected to a waste gas inlet pipe and a waste gas outlet pipe, and the waste gas outlet pipe of the upper heat exchange tube is connected to the waste gas inlet pipe of the lower heat exchange tube.

[0008] Each heat exchange tube is provided with a heat exchange component in the middle. The inner cavity of the heat exchange component is connected to the distribution tube for transporting refrigerant. The outer surface of the heat exchange component is located in the inner cavity of the heat exchange tube for heat exchange with the exhaust gas.

[0009] A condensate outlet pipe is connected to the lower part of the heat exchange tube.

[0010] Furthermore, the heat exchange assembly includes: a mounting plate, several U-shaped tubes, a partition plate, and several baffles;

[0011] The mounting plate mates with the inner wall of the heat exchange tube. The partition plate is fixedly connected to the mounting plate and mates with the inner wall of the diversion tube. The mounting plate, partition plate, and the inner cavity of the diversion tube form two non-communicating chambers. The upper chamber is connected to the refrigerant outlet pipe, and the lower chamber is connected to the refrigerant inlet pipe. Several U-shaped tubes are provided on the side of the mounting plate away from the partition plate. The two ends of the U-shaped tubes are connected to the upper chamber and the lower chamber, respectively. Several baffles are vertically sleeved on the U-shaped tubes at intervals, and adjacent baffles are symmetrically arranged vertically.

[0012] Furthermore, the inside of the diversion pipe is provided with a sealing assembly for cooperating with the partition plate;

[0013] The sealing assembly includes two snap-fit ​​plates that are fixedly connected to the inner wall of the diversion pipe and spaced apart. A sealing groove is formed between the two snap-fit ​​plates, and a sealing strip is provided inside the sealing groove.

[0014] Furthermore, the waste gas inlet pipe and the waste gas outlet pipe are located at both ends of the heat exchange tube, respectively.

[0015] Furthermore, a collection groove is provided at the bottom of the heat exchange tube, and the collection groove cooperates with the condensate outlet pipe.

[0016] Furthermore, a liquid level sensor is installed inside the condensate outlet pipe, and a control valve is connected to the lower part of the pipe.

[0017] Furthermore, a support is provided on the outer wall of the heat exchange tube.

[0018] Compared with the prior art, the present invention has the following technical effects:

[0019] 1. The heat exchanger for VOCs recovery and treatment described in this utility model has two heat exchange tubes connected to a refrigerant outlet pipe and a refrigerant inlet pipe via a branch pipe, and adjacent refrigerant outlet pipes and refrigerant inlet pipes are connected to form a continuous refrigerant circulation system. The refrigerant can continuously flow in this system, entering the branch pipe from the refrigerant inlet pipe, then entering the heat exchange component, and finally flowing out through the refrigerant outlet pipe. This circulation design allows the refrigerant to fully exchange heat with the exhaust gas, improving the refrigerant utilization rate and thus enhancing the overall heat exchange efficiency of the heat exchanger. The exhaust gas outlet pipe of the upper heat exchange tube is connected to the exhaust gas inlet pipe of the lower heat exchange tube, and the exhaust gas sequentially passes through the two heat exchange tubes for heat exchange. In this process, the exhaust gas undergoes multi-stage heat exchange with the refrigerant, which can more fully release heat, further reducing the temperature of the exhaust gas and effectively improving the heat exchange effect.

[0020] 2. The heat exchanger for VOCs recovery and treatment described in this utility model allows VOCs-containing waste gas to enter the heat exchange tubes and come into contact with the low-temperature outer surface of the heat exchange components. Due to the temperature decrease, the VOCs in the waste gas condense, forming a liquid condensate. The condensate flows downward under gravity and is eventually discharged through the condensate outlet pipe connected to the lower part of the heat exchange tubes. This achieves the transformation of VOCs from a gaseous state to a liquid state, facilitating their recovery and treatment, reducing VOCs emissions into the atmosphere, and achieving the dual goals of environmental protection and resource recovery. Attached Figure Description

[0021] Figure 1 This is an overall isometric view of a heat exchanger for VOCs recovery and treatment as described in this utility model;

[0022] Figure 2 This is a cross-sectional view of a heat exchanger for VOCs recovery and treatment according to the present invention;

[0023] Figure 3 This is a schematic diagram of a heat exchange component for a heat exchanger used in VOCs recovery and treatment according to this utility model;

[0024] Figure 4 This is a schematic diagram of a distribution pipe for a heat exchanger used for VOCs recovery and treatment according to this utility model;

[0025] Figure 5 This is a cross-sectional view of the branch pipe of a heat exchanger for VOCs recovery and treatment according to this utility model;

[0026] Figure 6 This is a schematic diagram of the interior of the condensate outlet pipe of a heat exchanger for VOCs recovery and treatment according to this utility model.

[0027] In the picture:

[0028] 1. Heat exchanger tubes;

[0029] 2. Diverter pipe; 201. Clip-on plate; 202. Sealing strip;

[0030] 3. Refrigerant inlet pipe; 4. Refrigerant outlet pipe; 5. Exhaust gas inlet pipe; 6. Exhaust gas outlet pipe;

[0031] 7. Heat exchanger assembly; 701. Mounting plate; 702. U-tube; 703. Divider plate; 704. Baffle plate;

[0032] 8. Condensate outlet pipe; 801. Liquid level sensor; 802. Collection tank;

[0033] 9. Support; 10. Control valve. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to specific embodiments of this application and the accompanying drawings.

[0035] like Figure 1-2 As shown, a heat exchanger for VOCs recovery and treatment includes: two heat exchange tubes 1 arranged vertically, one end of each heat exchange tube 1 being open and sealed to a branch pipe 2; the upper and lower parts of the branch pipe 2 are respectively connected to a refrigerant outlet pipe 4 and a refrigerant inlet pipe 3, and adjacent refrigerant outlet pipes 4 and refrigerant inlet pipes 3 of the two branch pipes 2 are connected; the upper and lower parts of the heat exchange tube 1 are respectively connected to a waste gas inlet pipe 5 and a waste gas outlet pipe 6, and the waste gas outlet pipe 6 of the upper heat exchange tube 1 is connected to the waste gas inlet pipe 5 of the lower heat exchange tube 1.

[0036] Each heat exchange tube 1 is provided with a heat exchange component 7 in the middle. The inner cavity of the heat exchange component 7 is connected to the diversion tube 2 for transporting refrigerant. The outer surface of the heat exchange component 7 is located in the inner cavity of the heat exchange tube 1 for heat exchange with the exhaust gas.

[0037] The lower part of the heat exchange tube 1 is connected to a condensate outlet pipe 8.

[0038] The two heat exchange tubes 1 of the heat exchanger are connected to the refrigerant outlet pipe 4 and the refrigerant inlet pipe 3 via a branch pipe 2, and adjacent refrigerant outlet pipes 4 and refrigerant inlet pipes 3 are connected to form a continuous refrigerant circulation system. The refrigerant can flow continuously in this system, entering the branch pipe 2 from the refrigerant inlet pipe 3, then entering the heat exchange component 7, and finally flowing out through the refrigerant outlet pipe 4. This circulation design allows the refrigerant to fully exchange heat with the exhaust gas, improving the refrigerant utilization rate and thus enhancing the overall heat exchange efficiency of the heat exchanger. The exhaust gas outlet pipe 6 of the upper heat exchange tube 1 is connected to the exhaust gas inlet pipe 5 of the lower heat exchange tube 1, and the exhaust gas passes through the two heat exchange tubes 1 sequentially for heat exchange. In this process, the exhaust gas undergoes multi-stage heat exchange with the refrigerant, releasing heat more fully and further reducing the temperature of the exhaust gas, effectively improving the heat exchange effect.

[0039] When VOCs-containing exhaust gas enters heat exchange tube 1, it comes into contact with the low-temperature heat exchange component 7. Due to the temperature drop, the VOCs in the exhaust gas condense, forming a liquid condensate. The condensate flows downward under gravity and is eventually discharged through the condensate outlet pipe 8 connected to the lower part of heat exchange tube 1. This process realizes the transformation of VOCs from a gaseous to a liquid state, facilitating their recovery and treatment, reducing VOC emissions into the atmosphere, and achieving the dual goals of environmental protection and resource recycling.

[0040] like Figure 2-3 As shown, the heat exchange assembly 7 includes: a mounting plate 701, a plurality of U-shaped tubes 702, a partition plate 703, and a plurality of baffles 704;

[0041] The mounting plate 701 mates with the inner wall of the heat exchange tube 1. The partition plate 703 is fixedly connected to the mounting plate 701 and mates with the inner wall of the diversion pipe 2. The mounting plate 701, the partition plate 703, and the inner cavity of the diversion pipe 2 form two non-communicating chambers. The upper chamber is connected to the refrigerant outlet pipe 4, and the lower chamber is connected to the refrigerant inlet pipe 3. Several U-shaped tubes 702 are provided on the side of the mounting plate 701 away from the partition plate 703. The two ends of the U-shaped tubes 702 are connected to the upper chamber and the lower chamber, respectively. Several baffles 704 are vertically sleeved on the U-shaped tubes 702 at intervals, and adjacent baffles 704 are arranged symmetrically.

[0042] The mounting plate 701, partition plate 703, and the inner cavity of the diversion pipe 2 form two separate chambers. The upper chamber is connected to the refrigerant outlet pipe 4, and the lower chamber is connected to the refrigerant inlet pipe 3. This design allows the refrigerant to flow orderly from the lower chamber into the U-shaped pipe 702, then into the upper chamber, and finally out through the refrigerant outlet pipe 4. The clear refrigerant flow path ensures sufficient refrigerant flow within the heat exchange assembly 7, avoiding short-circuiting or mixing and improving heat exchange efficiency. When the refrigerant flows within the U-shaped pipe 702, it has more contact time and area with the surrounding exhaust gas, thus more effectively absorbing heat from the exhaust gas and improving heat exchange efficiency.

[0043] Several baffles 704 are vertically mounted at intervals on the U-shaped tube 702, with adjacent baffles 704 arranged symmetrically vertically. This design forces the exhaust gas to continuously change its flow direction as it flows within the heat exchange tube 1, forming a tortuous flow path. On the one hand, this prolongs the residence time of the exhaust gas within the heat exchange tube 1, allowing it more time to exchange heat with the refrigerant within the U-shaped tube 702; on the other hand, it increases the contact area between the exhaust gas and the outer surface of the U-shaped tube 702, further improving heat exchange efficiency. Through this enhanced heat exchange effect, the temperature of the exhaust gas can be reduced more effectively. When the exhaust gas temperature drops below the dew point temperature of VOCs, the VOCs will rapidly condense into a liquid state. The efficient heat exchange allows more VOCs to complete the condensation process within the heat exchange tube 1, and then be discharged through the condensate outlet pipe, improving the VOCs recovery efficiency.

[0044] like Figure 4-5 As shown, the inside of the diversion pipe 2 is provided with a sealing assembly for cooperating with the partition plate 703;

[0045] The sealing assembly includes two snap-fit ​​plates 201 fixedly connected to the inner wall of the diversion pipe 2 and spaced apart. A sealing groove is formed between the two snap-fit ​​plates 201, and a sealing strip 202 is provided inside the sealing groove. The interior of the diversion pipe 2 is divided into two non-communicating chambers by a mounting plate 701, a partition plate 703, and the inner cavity of the diversion pipe 2, for refrigerant inflow and outflow, respectively. The sealing assembly, through the snap-fit ​​plates 201 forming the sealing groove and the installation of the sealing strip 202, can tightly fit the partition plate 703, effectively preventing refrigerant leakage and mixing between the two chambers. This ensures that the low-temperature refrigerant entering the lower chamber from the refrigerant inflow pipe can only flow to the upper chamber through the U-shaped pipe 702 and then exit from the refrigerant outflow pipe 4, avoiding short-circuiting of the refrigerant and ensuring that the refrigerant flows along a predetermined path, maintaining good heat exchange efficiency. Good sealing helps stabilize the refrigerant pressure and flow rate, enabling the entire heat exchange system to operate more stably. If the seal is not good, the refrigerant may flow abnormally in the manifold 2, resulting in insufficient heat exchange in some areas and affecting the VOCs recovery and treatment effect. The sealing component can prevent this from happening and improve the performance of the entire VOCs recovery and treatment heat exchanger system.

[0046] like Figure 1-2 As shown, the exhaust gas inlet pipe 5 and exhaust gas outlet pipe 6 are located at opposite ends of the heat exchange tube 1. This arrangement maximizes the flow path of the exhaust gas within the heat exchange tube 1. When the exhaust gas enters the heat exchange tube from one end via the exhaust gas inlet pipe 5, it needs to flow through the entire length of the heat exchange tube 1 before exiting through the exhaust gas outlet pipe 6 at the other end. During this process, the exhaust gas has more time to contact the heat exchange components 7, thus enabling more thorough heat exchange and more effectively transferring heat from the exhaust gas to the refrigerant, reducing the exhaust gas temperature and improving the condensation and recovery efficiency of VOCs.

[0047] like Figure 6 As shown, a collection trough 802 is provided at the bottom of the heat exchange tube 1, and the collection trough 802 cooperates with the condensate outlet pipe 8. When the exhaust gas containing VOCs comes into contact with the low-temperature heat exchange component 7 inside the heat exchange tube 1, the VOCs will condense into a liquid state. The collection trough 802 is located at the bottom of the heat exchange tube 1, and can effectively collect the condensate by utilizing gravity. Compared with the case without the collection trough 802, the condensate can flow to the collection trough 802 more quickly, avoiding accumulation at other positions at the bottom of the heat exchange tube 1, thus improving the efficiency of condensate collection. Furthermore, the setting of the collection trough 802 avoids the obstruction of the condensate by the lower baffle 704. Preferably, the bottom surface of the collection trough 802 is inclined, so that the condensate flows to the condensate outlet pipe 8.

[0048] In one specific embodiment, the waste gas outlet pipe 6 extends upward at one end of the inner cavity of the heat exchange tube 1 to form a flange for blocking the condensate, thereby preventing the condensate in the upper heat exchange tube 1 from flowing into the lower heat exchange tube 1 and enabling better graded recovery of the condensate.

[0049] like Figure 6 As shown, a liquid level sensor 801 is installed inside the condensate outlet pipe 8, and a control valve 10 is connected to its lower part. The liquid level sensor 801 can accurately monitor the liquid level of the condensate outlet pipe 8 and the bottom of the heat exchange tube 1 in real time. When condensate accumulates in the pipe and the liquid level reaches a preset upper limit, the liquid level sensor 801 will quickly detect this situation and transmit the signal to the external control system. The control system will promptly open the control valve 10 according to the received signal to allow the condensate to drain in time, and close the control valve 10 after the condensate level drops to the preset value. This avoids excessive accumulation of condensate in the outlet pipe, which could lead to overflow, and also prevents leakage of exhaust gas from the heat exchange tube 1, thereby ensuring the safety and cleanliness of the surrounding environment.

[0050] like Figure 1-2 As shown, a support 9 is fitted to the outer wall of the heat exchange tube 1. The support 9 provides solid support for the heat exchange tube 1, ensuring that the heat exchange tube 1 maintains a stable position during operation. This prevents the heat exchange tube 1 from shifting, deforming, or even being damaged due to uneven stress, thus ensuring the structural integrity and stability of the entire heat exchange system.

[0051] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several modifications and improvements can be made without departing from the inventive concept of the present utility model, and these all fall within the protection scope of the present utility model.

Claims

1. A heat exchanger for VOCs recovery and treatment, characterized in that, include: Two heat exchange tubes (1) are arranged vertically. One end of each heat exchange tube (1) is open and sealed with a branch pipe (2). The upper and lower parts of the branch pipe (2) are respectively connected to a refrigerant outlet pipe (4) and a refrigerant inlet pipe (3). The adjacent refrigerant outlet pipe (4) and refrigerant inlet pipe (3) of the two branch pipes (2) are connected. The upper and lower parts of the heat exchange tube (1) are respectively connected to a waste gas inlet pipe (5) and a waste gas outlet pipe (6). The waste gas outlet pipe (6) of the upper heat exchange tube (1) is connected to the waste gas inlet pipe (5) of the lower heat exchange tube (1). Each heat exchange tube (1) is provided with a heat exchange component (7) in the middle. The inner cavity of the heat exchange component (7) is connected to the diversion tube (2) for transporting refrigerant. The outer surface of the heat exchange component (7) is located in the inner cavity of the heat exchange tube (1) for heat exchange with the exhaust gas. The lower part of the heat exchange tube (1) is connected to a condensate outlet pipe (8).

2. A heat exchanger for VOCs recovery and treatment according to claim 1, characterized in that, The heat exchange assembly (7) includes: a mounting plate (701), a plurality of U-shaped tubes (702), a partition plate (703), and a plurality of baffles (704); The mounting plate (701) is fitted with the inner wall of the heat exchange tube (1), the partition plate (703) is fixedly connected to the mounting plate (701) and fits with the inner wall of the diversion tube (2). The mounting plate (701), the partition plate (703) and the inner cavity of the diversion tube (2) form two non-communicating chambers. The upper chamber is connected to the refrigerant outlet pipe (4) and the lower chamber is connected to the refrigerant inlet pipe (3). Several U-shaped tubes (702) are provided on the side of the mounting plate (701) away from the partition plate (703). The two ends of the U-shaped tubes (702) are connected to the upper chamber and the lower chamber respectively. Several baffles (704) are vertically sleeved on the U-shaped tubes (702) at intervals, and adjacent baffles (704) are symmetrically arranged vertically.

3. A heat exchanger for VOCs recovery and treatment according to claim 2, characterized in that, The inside of the diversion pipe (2) is provided with a sealing assembly for cooperating with the partition plate (703); The sealing assembly includes two snap-fit ​​plates (201) that are fixedly connected to the inner wall of the diversion pipe (2) and spaced apart. A sealing groove is formed between the two snap-fit ​​plates (201), and a sealing strip (202) is provided inside the sealing groove.

4. A heat exchanger for VOCs recovery and treatment according to claim 3, characterized in that, The waste gas inlet pipe (5) and waste gas outlet pipe (6) are located at the two ends of the heat exchange tube (1), respectively.

5. A heat exchanger for VOCs recovery and treatment according to claim 4, characterized in that, The bottom of the heat exchange tube (1) is provided with a collection groove (802), which is in conjunction with the condensate outlet pipe (8).

6. A heat exchanger for VOCs recovery and treatment according to claim 1, characterized in that, The condensate outlet pipe (8) is equipped with a liquid level sensor (801) inside, and a control valve (10) is connected to the lower part.

7. A heat exchanger for VOCs recovery and treatment according to claim 1, characterized in that, The outer wall of the heat exchange tube (1) is fitted with a support (9).

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