Cooling cascade plate heat exchanger structure for polymer exhaust

Abstract

This utility model relates to a series plate heat exchanger structure for cooling polymer exhaust gas, belonging to the field of polymer exhaust gas heat recovery technology. It includes a tube-and-shell heat exchanger and a liquid seal tank. An exhaust pipe is provided between the liquid seal tank and the tube-and-shell heat exchanger. An inlet pipe is provided at the upper end of the liquid seal tank. A circulating return gas pipe and a makeup gas pipe, connected to the tube-and-shell heat exchanger, are provided on the side of the tube-and-shell heat exchanger. A plate heat exchanger, connected in parallel with the tube-and-shell heat exchanger, is located below the side of the tube-and-shell heat exchanger. A plate inlet pipe I is provided between the plate heat exchanger and the circulating return gas pipe. A plate outlet pipe II is provided between the plate heat exchanger and the makeup gas pipe. A plate inlet pipe II, connected to the plate outlet pipe II, is provided between the exhaust pipe and the plate heat exchanger. A plate outlet pipe I, connected to the plate inlet pipe I, is provided between the exhaust pipe and the plate heat exchanger. It features a simple structure, good performance, and good operational stability. A plate heat exchanger is connected in series below the tube-and-shell heat exchanger to achieve precise adjustment of exhaust gas cooling.

Description

Technical Field

[0001] This utility model relates to the field of heat recovery technology for polymer exhaust gas, specifically to a cooling series plate heat exchange structure for polymer exhaust gas. Background Technology

[0002] In summer, when the cooling water temperature is high, the tube condenser of the polymerization exhaust often has insufficient cooling effect, which leads to increased polymerization pressure, or bubbling and overflow of liquid seal tank. It may even cause scalding accidents due to excessively high water temperature. Summary of the Invention

[0003] This invention addresses the shortcomings of existing technologies by providing a series plate heat exchanger structure for cooling polymerized exhaust gas. This structure is characterized by its simple structure, high efficiency, and stable operation. A plate heat exchanger is connected in series below the shell-and-tube heat exchanger to achieve precise regulation of exhaust gas cooling. In summer, when the cooling water temperature is high, the plate heat exchanger is activated to more effectively cool the polymerized exhaust gas, thus preventing flooding in the liquid seal tank and the risk of scalding due to excessively high water temperature. In winter, when the cooling water temperature is low, the plate heat exchanger can be deactivated, and the shell-and-tube condenser can be used alone to save energy and facilitate cleaning and maintenance.

[0004] The above-mentioned technical problems of this utility model are mainly solved by the following technical solutions:

[0005] A cooling series plate heat exchanger structure for agglomerated exhaust includes a tube heat exchanger and a liquid seal tank. An exhaust pipe is provided between the liquid seal tank and the tube heat exchanger. An inlet pipe is provided at the upper end of the liquid seal tank. A circulation return pipe and a make-up air pipe connected to the tube heat exchanger are provided on the side of the tube heat exchanger. A plate heat exchanger is provided below the side of the tube heat exchanger in parallel with the tube heat exchanger. A plate inlet pipe I is provided between the plate heat exchanger and the circulation return pipe. A plate outlet pipe II is provided between the plate heat exchanger and the make-up air pipe. A plate inlet pipe II is provided between the exhaust pipe and the plate heat exchanger and is connected to the plate outlet pipe II. A plate outlet pipe I is provided between the exhaust pipe and the plate heat exchanger and is connected to the plate inlet pipe I.

[0006] Preferably, the circulating air return pipe is provided with valves I and II located on both sides of the plate-type air inlet pipe I, the air replenishment pipe is provided with valve III located outside the plate-type air outlet pipe II, and the exhaust pipe is provided with valve VII located between the plate-type air outlet pipe I and the plate-type air inlet pipe II.

[0007] Preferably, the plate-type air inlet pipe I is equipped with valve IV, the plate-type air outlet pipe II is equipped with valve V, the plate-type air outlet pipe I is equipped with valve VI, and the plate-type air inlet pipe II is equipped with valve VIII.

[0008] Preferably, the tube heat exchanger includes a heat exchange tank, wherein the upper end of the heat exchange tank is provided with an inlet flange pipe I that is flange-bolted to the inlet pipe, the lower end of the heat exchange tank is provided with an outlet flange pipe II that is flange-bolted to the exhaust pipe, the upper side of the heat exchange tank is provided with an outlet flange pipe I that is flange-bolted to the circulating return gas pipe, and the lower side of the heat exchange tank is provided with an inlet flange pipe II that is flange-bolted to the make-up gas pipe.

[0009] Preferably, the inlet flange I and outlet flange I, and the outlet flange II and inlet flange II are each provided with a partition that separates the heat exchange tank into mutually connected chambers. Between the two partitions, there are several guide pipes arranged in an array and connected to the inlet flange I and outlet flange II. Between the outlet flange I and inlet flange II, there are several diverter plates arranged in an alternating pattern and connected to the guide pipes.

[0010] Preferably, the plate heat exchanger includes a fixed clamping plate and a movable clamping plate. A plurality of heat exchange plates are provided between the fixed clamping plate and the movable clamping plate. Each heat exchange plate has a guide rod at its upper and lower ends that is inserted into the heat exchange plate. The two ends of the guide rod are threadedly fixed to the fixed clamping plate and the movable clamping plate. A plurality of clamping screws are provided on both sides of the fixed clamping plate and the movable clamping plate and are locked by nuts.

[0011] Preferably, the heat exchange plate end face is provided with a sealing gasket, the sealing gasket faces the movable clamping plate, and the inner end face of the fixed clamping plate is provided with a rubber plate.

[0012] This invention can achieve the following effects:

[0013] This invention provides a series plate heat exchanger structure for cooling polymerized exhaust gas. Compared with existing technologies, it features a simple structure, good performance, and stable operation. A plate heat exchanger is connected in series below the shell-and-tube heat exchanger to achieve precise regulation of exhaust gas cooling. In summer, when the cooling water temperature is high, the plate heat exchanger is activated to more effectively cool the polymerized exhaust gas, thereby preventing flooding in the liquid seal tank and the risk of scalding due to excessively high water temperature. In winter, when the cooling water temperature is low, the plate heat exchanger can be deactivated, and the shell-and-tube condenser can be used alone to save energy and facilitate cleaning and maintenance.

[0014] High-efficiency composite heat exchange: It combines the advantages of shell and tube heat exchangers (high pressure resistance, large capacity) and plate heat exchangers (high heat exchange efficiency, compact structure).

[0015] Flexible operation modes: Through the precise control of 8 valves, multiple modes such as single-machine operation, series enhancement, and parallel diversion can be realized to adapt to different production loads and maintenance needs, greatly improving the availability and reliability of the system.

[0016] Internal Optimized Circulation: An internal circulation path was designed where gas is drawn from the top of the tube-and-shell heat exchanger, cooled by a plate heat exchanger, and then returned to the bottom. This not only utilizes the high efficiency of the plate heat exchanger but also optimizes the temperature field inside the tube-and-shell heat exchanger, avoiding localized overheating and improving overall heat exchange efficiency.

[0017] Safe and reliable: The liquid seal tank design at the inlet effectively prevents gas backfire and pressure fluctuations, ensuring system safety. Flange connections and modular plate design also facilitate installation, maintenance, and replacement. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model.

[0019] Figure 2 This is a structural cross-sectional view of the tube heat exchanger in this utility model.

[0020] Figure 3 This is an exploded view of the plate heat exchanger in this utility model.

[0021] In the diagram: 1. Shell and tube heat exchanger; 2. Inlet pipe; 3. Circulating return pipe; 4. Valve I; 5. Valve II; 6. Make-up air pipe; 7. Valve III; 8. Plate inlet pipe I; 9. Plate outlet pipe II; 10. Valve IV; 11. Plate heat exchanger; 12. Liquid seal tank; 13. Plate outlet pipe I; 14. Valve VI; 15. Valve VII; 16. Valve VIII; 17. Plate inlet pipe II; 18. Exhaust pipe; 19. Heat exchange tank; 20. Inlet flange pipe I; 21. Baffle plate; 22. Outlet flange pipe I; 23. Inlet flange pipe II; 24. Outlet flange pipe II; 25. Diverter plate; 26. Guide pipe; 27. Fixed clamping plate; 28. Guide rod; 29. ​​Heat exchange plate; 30. Movable clamping plate; 31. Sealing gasket; 32. Clamping screw; 33. Rubber plate; 34. Detailed Implementation

[0022] The technical solution of this utility model will be further described in detail below through embodiments and in conjunction with the accompanying drawings.

[0023] Example: Figure 1 , Figure 2 and Figure 3As shown, a cooling series plate heat exchanger structure for polymer exhaust includes a tube heat exchanger 1 and a liquid seal tank 13. An exhaust pipe 19 is provided between the liquid seal tank 13 and the tube heat exchanger 1. A valve VII 16 is provided on the exhaust pipe 19 between the plate outlet pipe I 14 and the plate inlet pipe II 18. An inlet pipe 2 is provided at the upper end of the liquid seal tank 13. A circulating return pipe 3 and a makeup pipe 6 connected to the tube heat exchanger 1 are provided on the side of the tube heat exchanger 1. Valves I 4 and II 5 are provided on the circulating return pipe 3 on both sides of the plate inlet pipe I 8. A valve III 7 is provided on the makeup pipe 6 outside the plate outlet pipe II 9. A plate heat exchanger 12 is provided below the side of the tube heat exchanger 1, connected in parallel with the tube heat exchanger 1. A plate inlet pipe I8 is provided between the plate heat exchanger 12 and the circulating return gas pipe 3. A valve IV10 is provided on the plate inlet pipe I8. A plate outlet pipe II9 is ​​provided between the plate heat exchanger 12 and the make-up gas pipe 6. A valve V11 is provided on the plate outlet pipe II9. A plate inlet pipe II18 is provided between the exhaust pipe 19 and the plate heat exchanger 12, connected to the plate outlet pipe II9. A valve VIII17 is provided on the plate inlet pipe II18. A plate outlet pipe I14 is provided between the exhaust pipe 19 and the plate heat exchanger 12, connected to the plate inlet pipe I8. A valve VI15 is provided on the plate outlet pipe I14.

[0024] The shell and tube heat exchanger 1 includes a heat exchange tank 20. The upper end of the heat exchange tank 20 is provided with an inlet flange pipe I 21 that is fixed to the inlet pipe 2 by flange bolts. The lower end of the heat exchange tank 20 is provided with an outlet flange pipe II 25 that is fixed to the exhaust pipe 19 by flange bolts. The upper side of the heat exchange tank 20 is provided with an outlet flange pipe I 23 that is fixed to the circulating return gas pipe 3 by flange bolts. The lower side of the heat exchange tank 20 is provided with an inlet flange pipe II 24 that is fixed to the make-up gas pipe 6 by flange bolts. A partition plate 22 is provided between the inlet flange pipe I 21 and the outlet flange pipe I 23, and between the outlet flange pipe II 25 and the inlet flange pipe II 24, which separates the heat exchange tank 20 into interconnected chambers. Between the two partition plates 22, there are 24 guide pipes 27 arranged in an array and connected to the inlet flange pipe I 21 and the outlet flange pipe II 25. Between the outlet flange pipe I 23 and the inlet flange pipe II 24, there are 7 diverter plates 26 arranged in an alternating pattern and connected to the guide pipes 27.

[0025] The plate heat exchanger 12 includes a fixed clamping plate 28 and a movable clamping plate 31. The inner end face of the fixed clamping plate 28 is provided with a rubber plate 34. Five heat exchange plates 30 are provided between the fixed clamping plate 28 and the movable clamping plate 31. The end face of the heat exchange plates 30 is provided with a sealing gasket 32, which faces the movable clamping plate 31. The upper and lower ends of the heat exchange plates 30 are provided with guide rods 29 that are inserted into the heat exchange plates 30. The two ends of the guide rods 29 are threadedly fixed to the fixed clamping plate 28 and the movable clamping plate 31. Three clamping screws 33 are provided on both sides of the fixed clamping plate 28 and the movable clamping plate 31, which penetrate the fixed clamping plate 28 and the movable clamping plate 31 and are locked with nuts.

[0026] When the base cooling or plate heat exchanger needs maintenance, the shell and tube heat exchanger is used in single-unit operation mode.

[0027] Valve status:

[0028] Open: Valve I4, Valve II5, Valve III7, Valve VII16.

[0029] Close: Valves IV10, V11, VI15, and VIII17.

[0030] Airflow path:

[0031] The original thermal polymerization exhaust gas flows directly downwards through the liquid seal tank 13, then through the inlet pipe 2, and finally to the top of the tube-and-shell heat exchanger 1. Inside the tube-and-shell heat exchanger, most of the gas flows directly downwards through 24 guide pipes 27 and is cooled by the cooling medium outside the pipes. A small portion of the gas or circulating gas enters the circulating return pipe 3 from the upper chamber through the outlet flange pipe I 23. Because valve IV 10 is closed, this portion of the gas cannot enter the plate heat exchanger. It flows directly to the circulating return pipe 3 after passing through the open valves I 4 and II 5. In the lower chamber, it mixes with the main gas flow from the guide pipes 27, undergoes secondary mixing and cooling, and then is discharged through the outlet flange pipe II 25. The mixed gas then flows through the exhaust pipe 19, valve VII 16, and is discharged downstream for treatment or emission.

[0032] The series-enhanced cooling mode maximizes cooling efficiency for handling high-temperature or high-load gases.

[0033] Valve status:

[0034] Open: Valve I4, Valve II5, Valve III7, Valve IV10, Valve V11, Valve VI15, Valve VII16, Valve VIII17.

[0035] This forms a composite system of "main hot gas series cooling" and "internal cold gas circulation". The shell and tube heat exchanger provides primary cooling, the plate heat exchanger provides secondary cooling, and the internal circulation further optimizes the temperature distribution within the shell and tube heat exchanger, resulting in the highest cooling efficiency.

[0036] In summary, this series plate heat exchanger structure for cooling the polymerized exhaust gas features simple structure, good performance, and stable operation. A plate heat exchanger is connected in series below the shell-and-tube heat exchanger to achieve precise regulation of exhaust gas cooling. In summer, when the cooling water temperature is high, the plate heat exchanger is activated to more effectively cool the polymerized exhaust gas, thus preventing flooding in the liquid seal tank and the risk of scalding due to excessively high water temperature. In winter, when the cooling water temperature is low, the plate heat exchanger can be deactivated, and the shell-and-tube condenser can be used alone to save energy and facilitate cleaning and maintenance.

[0037] It will be apparent to those skilled in the art that this invention is not limited to the details of the above exemplary embodiments, and that it can be implemented in other specific forms without departing from the essential characteristics of the invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0038] In summary, the above description is only a specific embodiment of the present utility model, but the structural features of the present utility model are not limited thereto. Any changes or modifications made by those skilled in the art within the scope of the present utility model are covered by the patent scope of the present utility model.

Claims

1. A series plate heat exchanger structure for cooling aggregated exhaust gas, characterized in that: It includes a shell and tube heat exchanger (1) and a liquid seal tank (13). An exhaust pipe (19) is provided between the liquid seal tank (13) and the shell and tube heat exchanger (1). An air inlet pipe (2) is provided at the upper end of the liquid seal tank (13). A circulating return air pipe (3) and a make-up air pipe (6) connected to the shell and tube heat exchanger (1) are provided on the side. A plate heat exchanger (12) connected in parallel with the shell and tube heat exchanger (1) is provided below the side of the shell and tube heat exchanger (1). A plate inlet pipe I (8) is provided between the plate heat exchanger (12) and the circulating return pipe (3), a plate outlet pipe II (9) is provided between the plate heat exchanger (12) and the make-up air pipe (6), a plate inlet pipe II (18) connected to the plate outlet pipe II (9) is provided between the exhaust pipe (19) and the plate heat exchanger (12), and a plate outlet pipe I (14) connected to the plate inlet pipe I (8) is provided between the exhaust pipe (19) and the plate heat exchanger (12).

2. The cooling series plate heat exchange structure for polymer exhaust gas according to claim 1, characterized in that: The circulating air return pipe (3) is provided with valves I (4) and II (5) located on both sides of the plate-type air inlet pipe I (8), the air replenishment pipe (6) is provided with valve III (7) located outside the plate-type air outlet pipe II (9), and the exhaust pipe (19) is provided with valve VII (16) located between the plate-type air outlet pipe I (14) and the plate-type air inlet pipe II (18).

3. The cooling series plate heat exchange structure for polymer exhaust gas according to claim 1, characterized in that: The plate-type air inlet pipe I (8) is equipped with valve IV (10), the plate-type air outlet pipe II (9) is equipped with valve V (11), the plate-type air outlet pipe I (14) is equipped with valve VI (15), and the plate-type air inlet pipe II (18) is equipped with valve VIII (17).

4. The cooling series plate heat exchange structure for polymer exhaust gas according to claim 1, characterized in that: The tube heat exchanger (1) includes a heat exchange tank (20). The upper end of the heat exchange tank (20) is provided with an inlet flange pipe I (21) which is fixed to the inlet pipe (2) by flange bolts. The lower end of the heat exchange tank (20) is provided with an outlet flange pipe II (25) which is fixed to the exhaust pipe (19) by flange bolts. The upper side of the heat exchange tank (20) is provided with an outlet flange pipe I (23) which is fixed to the circulating return gas pipe (3) by flange bolts. The lower side of the heat exchange tank (20) is provided with an inlet flange pipe II (24) which is fixed to the make-up gas pipe (6) by flange bolts.

5. The cooling series plate heat exchanger structure for polymer exhaust gas according to claim 4, characterized in that: The inlet flange pipe I (21) and outlet flange pipe I (23), and the outlet flange pipe II (25) and inlet flange pipe II (24) are provided with partitions (22) that separate the heat exchange tank (20) into interconnected chambers. Between the two partitions (22) are several guide pipes (27) arranged in an array and connected to the inlet flange pipe I (21) and outlet flange pipe II (25). Between the outlet flange pipe I (23) and inlet flange pipe II (24) are several diverter plates (26) arranged in an alternating manner and connected to the guide pipes (27).

6. The cooling series plate heat exchanger structure for polymer exhaust gas according to claim 1, characterized in that: The plate heat exchanger (12) includes a fixed clamping plate (28) and a movable clamping plate (31). A plurality of heat exchange plates (30) are provided between the fixed clamping plate (28) and the movable clamping plate (31). The upper and lower ends of the heat exchange plates (30) are provided with guide rods (29) that are inserted into the heat exchange plates (30). The two ends of the guide rods (29) are threadedly fixed to the fixed clamping plate (28) and the movable clamping plate (31). A plurality of clamping screws (33) are provided on both sides of the fixed clamping plate (28) and the movable clamping plate (31) and are locked with nuts.

7. The cooling series plate heat exchanger structure for polymer exhaust gas according to claim 6, characterized in that: The heat exchange plate (30) is provided with a sealing gasket (32) on its end face, the sealing gasket (32) faces the movable clamping plate (31), and the inner end face of the fixed clamping plate (28) is provided with a rubber plate (34).

Images