Phosphorus trichloride condensing system

Abstract

This utility model discloses a phosphorus trichloride condensation system, including a primary heat exchanger, a secondary heat exchanger, a feed pipe, a discharge pipe, a medium inlet pipe, a medium outlet pipe, and connecting pipes. The primary and secondary heat exchangers each have an inlet for receiving phosphorus trichloride gas, a drain outlet for discharging liquid phosphorus trichloride, an exhaust outlet for discharging phosphorus trichloride gas, a medium inlet for receiving cooling medium, and a medium outlet for discharging cooling medium. The feed pipe is connected to the feed outlet of the primary heat exchanger, and the exhaust outlet of the primary heat exchanger is connected to the feed outlet of the secondary heat exchanger via the connecting pipes. The drain outlets of the primary and secondary heat exchangers are respectively connected to the discharge pipes. This utility model can improve the condensation effect of phosphorus trichloride gas and avoid the problem of a large amount of phosphorus trichloride gas not being condensed and liquefied.

Description

Technical Field

[0001] This utility model relates to a phosphorus trichloride condensation system. Background Technology

[0002] Currently, in the production of phosphorus trichloride, the phosphorus trichloride gas exiting the scrubbing tower typically reaches a temperature of 74-76°C and a slightly positive pressure of 0.01 MPa, appearing colorless and transparent. The phosphorus trichloride gas exiting the scrubbing tower requires condensation and liquefaction. For example, Chinese patent CN213475425U discloses a high-efficiency phosphorus trichloride production device with recoverable heat, in which the phosphorus trichloride gas, after scrubbing in the scrubbing tower, enters a heat exchanger for condensation and liquefaction. However, most existing technologies use a single heat exchanger for condensation and liquefaction of the phosphorus trichloride gas, often resulting in unsatisfactory condensation effects. This leads to a significant amount of phosphorus trichloride gas failing to be condensed and liquefied, thus affecting the normal production of phosphorus trichloride. Summary of the Invention

[0003] The technical problem to be solved by this utility model is to overcome the defects of the prior art and provide a phosphorus trichloride condensation system that can improve the condensation effect of phosphorus trichloride gas and avoid the problem of a large amount of phosphorus trichloride gas not being condensed and liquefied.

[0004] To solve the above-mentioned technical problems, the technical solution of this utility model is: a phosphorus trichloride condensation system, including a primary heat exchanger, a secondary heat exchanger, a feed pipeline, a discharge pipeline, a medium inlet pipeline, a medium outlet pipeline, and connecting pipelines;

[0005] The primary heat exchanger and the secondary heat exchanger each have an inlet for receiving phosphorus trichloride gas, a drain outlet for discharging phosphorus trichloride liquid, an exhaust outlet for discharging phosphorus trichloride gas, a medium inlet for receiving cooling medium, and a medium outlet for discharging cooling medium.

[0006] The feed pipeline is connected to the feed inlet of the first-stage heat exchanger;

[0007] The exhaust port of the primary heat exchanger is connected to the inlet of the secondary heat exchanger via the connecting pipe.

[0008] The drain outlet of the primary heat exchanger and the drain outlet of the secondary heat exchanger are respectively connected to the discharge pipeline;

[0009] The inlet medium pipeline is connected to the medium inlet of the first-stage heat exchanger and the medium inlet of the second-stage heat exchanger, respectively.

[0010] The outlet medium pipeline is connected to the medium outlet of the first-stage heat exchanger and the medium outlet of the second-stage heat exchanger, respectively.

[0011] Furthermore, the phosphorus trichloride condensation system also includes a gas-liquid separator, and the exhaust port of the secondary heat exchanger is connected to the gas-liquid separator.

[0012] Furthermore, both the primary heat exchanger and the secondary heat exchanger are vertical shell-and-tube heat exchangers.

[0013] Furthermore, the primary heat exchanger and the secondary heat exchanger each include a shell, an upper partition, a lower partition, and multiple heat exchange tubes;

[0014] The upper partition and the lower partition are respectively installed inside the housing, and the upper partition and the lower partition divide the housing to form an upper chamber above the upper partition, a material chamber between the upper partition and the lower partition, and a lower chamber below the lower partition;

[0015] The heat exchange tube is installed in the material chamber. The upper end of the heat exchange tube is connected to the upper partition and communicates with the upper chamber. The lower end of the heat exchange tube is connected to the lower partition and communicates with the lower chamber.

[0016] The feed inlet, drain outlet, vent outlet, medium inlet, and medium outlet are all located on the outer casing. The feed inlet is connected to the lower end of the material chamber, the drain outlet is connected to the lower end of the material chamber, the vent outlet is connected to the upper end of the material chamber, the medium inlet is connected to the upper chamber, and the medium outlet is connected to the lower chamber.

[0017] Furthermore, the outer wall of the heat exchange tube is provided with a plurality of outer fins arranged sequentially from top to bottom at intervals.

[0018] Furthermore, the inner wall of the heat exchange tube is provided with inner fins.

[0019] Furthermore, the inner fins extend axially along the heat exchange tube, and at least two inner fins are arranged sequentially at intervals along the circumference of the heat exchange tube.

[0020] Furthermore, the primary heat exchanger and the secondary heat exchanger also include a sealing plate and a floating component, respectively;

[0021] The sealing plate is slidably connected to the outer shell and fits against the inner wall of the outer shell. The sealing plate has a closed position that slides down to block the drain port and an open position that slides up to open the drain port.

[0022] The floating component is connected to the sealing plate and is used to float up and down with the rise and fall of the phosphorus trichloride liquid in the material chamber, thereby driving the sealing plate to slide up and down.

[0023] Furthermore, the inner wall of the outer shell is provided with an upper limit block and a lower limit block;

[0024] The lower limit block is located below the sealing plate and is used to abut against the sealing plate when the sealing plate slides down to the closed position to limit the sealing plate from moving further downward;

[0025] The upper limit block is located above the sealing plate and is used to abut against the sealing plate when the sealing plate slides upward to the open position, thereby limiting the sealing plate from moving further upward.

[0026] Furthermore, a left guide rail and a right guide rail are connected to the inner wall of the outer casing. A left sliding groove is provided between the right end of the left guide rail and the outer casing, and a right sliding groove is provided between the left end of the right guide rail and the outer casing. The left side of the sealing plate slides up and down in the left sliding groove, and the right side of the sealing plate slides up and down in the right sliding groove.

[0027] With the above technical solution, in both the primary and secondary heat exchangers, the cooling medium in the inlet pipe flows in from the medium inlet and then exits from the medium outlet to the outlet pipe. The phosphorus trichloride gas entering the primary heat exchanger exchanges heat with the cooling medium. After heat exchange, a large amount of the phosphorus trichloride gas condenses and liquefies into liquid phosphorus trichloride, which is then discharged from the liquid outlet of the primary heat exchanger into the outlet pipe and subsequently discharged. Uncondensed phosphorus trichloride gas in the primary heat exchanger flows from the exhaust port of the primary heat exchanger through the connecting pipe and then enters the secondary heat exchanger from the inlet. The phosphorus trichloride gas entering the secondary heat exchanger exchanges heat with the cooling medium. After heat exchange, the phosphorus trichloride gas further condenses and liquefies into liquid phosphorus trichloride, which is then discharged from the liquid outlet of the secondary heat exchanger into the outlet pipe and subsequently discharged. At this point, only a very small amount of unliquefied phosphorus trichloride gas remains in the secondary heat exchanger, and this unliquefied phosphorus trichloride gas is discharged from the exhaust port of the secondary heat exchanger. After two condensation and liquefaction processes in the primary and secondary heat exchangers, most of the phosphorus trichloride gas is condensed and liquefied into phosphorus trichloride liquid, thereby improving the condensation effect of phosphorus trichloride gas and avoiding the problem of a large amount of phosphorus trichloride gas failing to be condensed and liquefied, thus ensuring the normal production of phosphorus trichloride. Attached Figure Description

[0028] Figure 1 This is a process flow diagram of the phosphorus trichloride condensation system of this utility model;

[0029] Figure 2 This is a schematic diagram of the structure of the primary heat exchanger and the secondary heat exchanger of this utility model;

[0030] Figure 3 This is a schematic diagram of the heat exchange tube of this utility model. Figure 1 ;

[0031] Figure 4 This is a schematic diagram of the heat exchange tube of this utility model. Figure 2 ;

[0032] Figure 5 This is a structural schematic diagram of the sealing plate and floating component of this utility model;

[0033] In the diagram: 1. Primary heat exchanger; 2. Secondary heat exchanger; 3. Feed pipe; 4. Discharge pipe; 5. Medium inlet pipe; 6. Medium outlet pipe; 7. Connecting pipe; 8. Feed inlet; 9. Drain outlet; 10. Exhaust outlet; 11. Medium inlet; 12. Medium outlet; 13. Shell; 14. Upper baffle; 15. Lower baffle; 16. Heat exchange tube; 17. Upper chamber; 18. Material chamber; 19. Lower chamber; 20. Outer fins; 21. Inner fins; 22. Sealing plate; 23. Floating component; 24. Upper limit block; 25. Lower limit block; 26. Left guide rail; 27. Right guide rail; 28. Left chute; 29. ​​Right chute. Detailed Implementation

[0034] To make the contents of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0035] like Figure 1 As shown, a phosphorus trichloride condensation system includes a primary heat exchanger 1, a secondary heat exchanger 2, a feed pipe 3, a discharge pipe 4, a medium inlet pipe 5, a medium outlet pipe 6, and a connecting pipe 7.

[0036] The primary heat exchanger 1 and the secondary heat exchanger 2 each have an inlet 8 for receiving phosphorus trichloride gas, a drain 9 for discharging phosphorus trichloride liquid, an exhaust 10 for discharging phosphorus trichloride gas, a medium inlet 11 for receiving cooling medium, and a medium outlet 12 for discharging cooling medium.

[0037] The feed pipeline 3 is connected to the feed inlet 8 of the first-stage heat exchanger 1;

[0038] The exhaust port 10 of the primary heat exchanger 1 is connected to the feed port 8 of the secondary heat exchanger 2 through the connecting pipe 7.

[0039] The drain port 9 of the primary heat exchanger 1 and the drain port 9 of the secondary heat exchanger 2 are respectively connected to the discharge pipeline 4.

[0040] The inlet medium pipeline 5 is connected to the medium inlet 11 of the first-stage heat exchanger 1 and the medium inlet 11 of the second-stage heat exchanger 2, respectively.

[0041] The outlet medium pipeline 6 is connected to the medium outlet 12 of the first-stage heat exchanger 1 and the medium outlet 12 of the second-stage heat exchanger 2, respectively.

[0042] Specifically, in the primary heat exchanger 1 and the secondary heat exchanger 2, the cooling medium in the inlet medium pipeline 5 flows in from the medium inlet 11 and then exits from the medium outlet 12 into the outlet medium pipeline 6. The phosphorus trichloride gas entering the primary heat exchanger 1 will exchange heat with the cooling medium entering the primary heat exchanger 1. After heat exchange, a large amount of the phosphorus trichloride gas will condense and liquefy into phosphorus trichloride liquid and be discharged from the liquid outlet 9 of the primary heat exchanger 1 into the discharge pipeline 4 and then discharged. The uncondensed phosphorus trichloride gas in the primary heat exchanger 1 will flow from the exhaust port 10 of the primary heat exchanger 1 through the connecting pipeline 7 and then enter the secondary heat exchanger 2 from the feed inlet 8. The phosphorus trichloride gas entering the secondary heat exchanger 2 exchanges heat with the cooling medium entering the secondary heat exchanger 2. After heat exchange, the phosphorus trichloride gas is further condensed and liquefied into phosphorus trichloride liquid, which is discharged from the drain port 9 of the secondary heat exchanger 2 into the discharge pipe 4 and then discharged. At this time, only a very small amount of phosphorus trichloride gas in the secondary heat exchanger 2 remains unliquefied, and the unliquefied phosphorus trichloride gas is discharged from the exhaust port 10 of the secondary heat exchanger 2. After two condensation and liquefaction processes in the primary heat exchanger 1 and the secondary heat exchanger 2, most of the phosphorus trichloride gas is condensed and liquefied into phosphorus trichloride liquid, thereby improving the condensation effect of phosphorus trichloride gas and avoiding the problem of a large amount of phosphorus trichloride gas failing to be condensed and liquefied, thus ensuring the normal production of phosphorus trichloride. Among them, a small portion of the phosphorus trichloride liquid in the discharge pipe 4 goes to the phosphorus trichloride tank, while most of it goes to the phosphorus washing tower. The cooling medium in the outlet medium pipe 6 flows back to the cooling water tower, and the cooling medium can be cooling water.

[0043] In this embodiment, the phosphorus trichloride condensation system may further include a gas-liquid separator, and the exhaust port 10 of the secondary heat exchanger 2 is connected to the gas-liquid separator so that a small amount of uncondensed phosphorus trichloride gas in the secondary heat exchanger 2 is discharged from the exhaust port 10 of the secondary heat exchanger 2 to the gas-liquid separator.

[0044] In this embodiment, both the primary heat exchanger 1 and the secondary heat exchanger 2 can be vertical shell-and-tube heat exchangers.

[0045] like Figure 2 As shown, the primary heat exchanger 1 and the secondary heat exchanger 2 may each include a shell 13, an upper partition 14, a lower partition 15, and a plurality of heat exchange tubes 16;

[0046] The upper partition 14 and the lower partition 15 are respectively installed inside the outer shell 13. The upper partition 14 and the lower partition 15 divide the outer shell 13 to form an upper chamber 17 located above the upper partition 14, a material chamber 18 located between the upper partition 14 and the lower partition 15, and a lower chamber 19 located below the lower partition 15.

[0047] The heat exchange tube 16 is installed in the material chamber 18. The upper end of the heat exchange tube 16 is connected to the upper partition 14 and communicates with the upper chamber 17. The lower end of the heat exchange tube 16 is connected to the lower partition 15 and communicates with the lower chamber 19.

[0048] The feed inlet 8, the drain outlet 9, the vent 10, the medium inlet 11, and the medium outlet 12 are all located on the outer shell 13. The feed inlet 8 is connected to the lower end of the material chamber 18, the drain outlet 9 is connected to the lower end of the material chamber 18, the vent 10 is connected to the upper end of the material chamber 18, the medium inlet 11 is connected to the upper chamber 17, and the medium outlet 12 is connected to the lower chamber 19.

[0049] like Figures 2-4As shown, the outer wall of the heat exchange tube 16 is provided with a plurality of outer fins 20 arranged sequentially from top to bottom at intervals, and the inner wall of the heat exchange tube 16 is provided with inner fins 21. The inner fins 21 extend along the axial direction of the heat exchange tube 16, and at least two inner fins 21 are arranged sequentially at intervals along the circumference of the heat exchange tube 16. Specifically, in the primary heat exchanger 1 and the secondary heat exchanger 2, the cooling medium in the inlet medium pipeline 5 flows from the medium inlet 11 into the upper chamber 17, then into the plurality of heat exchange tubes 16, then downward into the lower chamber 19, and finally into the outlet medium pipeline 6 from the medium outlet 12. Phosphorus trichloride gas first enters the material chamber 18 of the first-stage heat exchanger 1 from the feed port 8. After exchanging heat with the cooling medium in the heat exchange tube 16, the phosphorus trichloride gas in the material chamber 18 of the first-stage heat exchanger 1 condenses and liquefies into phosphorus trichloride liquid. The condensed and liquefied phosphorus trichloride liquid in the first-stage heat exchanger 1 is discharged from the drain port 9 of the first-stage heat exchanger 1 into the discharge pipe 4. The uncondensed phosphorus trichloride gas in the material chamber 18 of the first-stage heat exchanger 1 flows from the exhaust port 10 of the first-stage heat exchanger 1 through the connecting pipe 7 and then enters the material chamber 18 of the second-stage heat exchanger 2 from the feed port 8. The phosphorus trichloride gas in the material chamber 18 of the secondary heat exchanger 2 will exchange heat with the cooling medium in the heat exchange tube 16 of the secondary heat exchanger 2, and then be further condensed and liquefied into phosphorus trichloride liquid. It will be discharged from the drain port 9 of the secondary heat exchanger 2 into the discharge pipe 4 and then discharged. A very small amount of uncondensed and liquefied phosphorus trichloride gas in the material chamber 18 of the secondary heat exchanger 2 will be discharged from the exhaust port 10 of the secondary heat exchanger 2 into the gas-liquid separator. More specifically, phosphorus trichloride gas exchanges heat with the cooling medium through the heat exchange tube 16. By setting the outer fins 20, the contact area between the phosphorus trichloride gas in the material chamber 18 and the heat exchange tube 16 is increased, thereby enabling the heat of the phosphorus trichloride gas to be rapidly conducted to the heat exchange tube 16. The inner fins 21 increase the contact area between the cooling medium in the heat exchange tube 16 and the heat exchange tube 16, thereby enabling the heat of the heat exchange tube 16 to be rapidly transferred to the cooling medium. This improves the efficiency of indirect heat exchange between the phosphorus trichloride gas and the cooling medium, and further enhances the condensation and liquefaction effect of the phosphorus trichloride gas.

[0050] like Figure 2 , 5 As shown, the primary heat exchanger 1 and the secondary heat exchanger 2 may also include a sealing plate 22 and a floating component 23, respectively;

[0051] The sealing plate 22 is slidably connected to the outer shell 13 and fits against the inner wall of the outer shell 13. The sealing plate 22 has a closed position that slides down to block the drain port 9 and an open position that slides up to open the drain port 9.

[0052] The floating component 23 is connected to the sealing plate 22. The floating component 23 is used to float up and down as the liquid level of phosphorus trichloride liquid in the material chamber 18 rises and falls, thereby driving the sealing plate 22 to slide up and down.

[0053] Specifically, in the initial stage when phosphorus trichloride gas enters the material chamber 18, before the bottom of the material chamber 18 has accumulated condensed and liquefied phosphorus trichloride liquid, the sealing plate 22 slides downward to the closed position under the action of gravity, thereby blocking the drain port 9 and preventing the phosphorus trichloride gas in the material chamber 18 from being discharged from the drain port 9. As the condensation reaction proceeds, the phosphorus trichloride gas is continuously liquefied and accumulates at the bottom of the material chamber 18. As the liquid level of the phosphorus trichloride liquid rises, the floating component 23 floats on the liquid surface and moves upward, thereby driving the sealing plate 22 upward toward the open position, thus opening the drain port 9. Then, the phosphorus trichloride liquid at the bottom of the material chamber 18 can be discharged from the drain port 9 into the discharge pipe 4. As the phosphorus trichloride liquid is discharged from the drain port 9, the liquid level decreases. At this time, the floating component 23 moves downwards with the decreasing liquid level, thereby causing the sealing plate 22 to move downwards towards the closed position. This allows the sealing plate 22 to re-seal the drain port 9, preventing phosphorus trichloride gas from escaping from the drain port 9. In this embodiment, the floating component 23 can be a hollow structure.

[0054] like Figure 2 , 5 As shown, the inner wall of the outer casing 13 may be provided with an upper limit block 24 and a lower limit block 25;

[0055] The lower limit block 25 is located below the sealing plate 22 and is used to abut against the sealing plate 22 when the sealing plate 22 slides down to the closed position to limit the sealing plate 22 from continuing to move downward;

[0056] The upper limit block 24 is located above the sealing plate 22 and is used to abut against the sealing plate 22 when the sealing plate 22 slides upward to the open position to limit the sealing plate 22 from moving further upward.

[0057] like Figure 2 , 5 As shown, a left guide rail 26 and a right guide rail 27 can be connected to the inner wall of the outer casing 13. A left sliding groove 28 is provided between the right end of the left guide rail 26 and the outer casing 13, and a right sliding groove 29 is provided between the left end of the right guide rail 27 and the outer casing 13. The left side of the sealing plate 22 slides up and down in the left sliding groove 28, and the right side of the sealing plate 22 slides up and down in the right sliding groove 29.

[0058] In summary, in both the primary heat exchanger 1 and the secondary heat exchanger 2, the cooling medium in the inlet medium pipeline 5 flows in from the medium inlet 11 and then exits from the medium outlet 12 into the outlet medium pipeline 6. The phosphorus trichloride gas entering the primary heat exchanger 1 exchanges heat with the cooling medium entering the primary heat exchanger 1. After heat exchange, a large amount of the phosphorus trichloride gas condenses and liquefies into phosphorus trichloride liquid, which is then discharged from the liquid outlet 9 of the primary heat exchanger 1 into the discharge pipeline 4 and subsequently discharged. The uncondensed phosphorus trichloride gas in the primary heat exchanger 1 flows from the exhaust port 10 of the primary heat exchanger 1 through the connecting pipeline 7 and then enters the secondary heat exchanger 2 from the feed inlet 8. The phosphorus trichloride gas entering the secondary heat exchanger 2 exchanges heat with the cooling medium entering the secondary heat exchanger 2. After heat exchange, the phosphorus trichloride gas is further condensed and liquefied into phosphorus trichloride liquid, which is discharged from the drain port 9 of the secondary heat exchanger 2 into the discharge pipe 4 and then discharged. At this time, only a very small amount of phosphorus trichloride gas in the secondary heat exchanger 2 remains unliquefied, and the unliquefied phosphorus trichloride gas is discharged from the exhaust port 10 of the secondary heat exchanger 2. After two condensation and liquefaction processes in the primary heat exchanger 1 and the secondary heat exchanger 2, most of the phosphorus trichloride gas is condensed and liquefied into phosphorus trichloride liquid, thereby improving the condensation effect of phosphorus trichloride gas and avoiding the problem of a large amount of phosphorus trichloride gas failing to be condensed and liquefied, thus ensuring the normal production of phosphorus trichloride.

[0059] The specific embodiments described above further illustrate the technical problems, technical solutions, and beneficial effects of this utility model. It should be understood that the above descriptions are merely specific embodiments of this utility model and are not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A phosphorus trichloride condensing system characterized by, It includes a primary heat exchanger (1), a secondary heat exchanger (2), a feed pipe (3), a discharge pipe (4), a medium inlet pipe (5), a medium outlet pipe (6), and a connecting pipe (7). The primary heat exchanger (1) and the secondary heat exchanger (2) are respectively provided with a feed port (8) for receiving phosphorus trichloride gas, a drain port (9) for discharging phosphorus trichloride liquid, an exhaust port (10) for discharging phosphorus trichloride gas, a medium inlet (11) for receiving cooling medium, and a medium outlet (12) for discharging cooling medium. The feed pipe (3) is connected to the feed inlet (8) of the first-stage heat exchanger (1); The exhaust port (10) of the primary heat exchanger (1) is connected to the feed port (8) of the secondary heat exchanger (2) through the connecting pipe (7); The drain port (9) of the primary heat exchanger (1) and the drain port (9) of the secondary heat exchanger (2) are respectively connected to the discharge pipeline (4); The inlet medium pipeline (5) is connected to the medium inlet (11) of the first-stage heat exchanger (1) and the medium inlet (11) of the second-stage heat exchanger (2), respectively. The outlet medium pipeline (6) is connected to the medium outlet (12) of the first-stage heat exchanger (1) and the medium outlet (12) of the second-stage heat exchanger (2), respectively.

2. The phosphorus trichloride condensing system of claim 1, wherein, It also includes a gas-liquid separator, and the exhaust port (10) of the secondary heat exchanger (2) is connected to the gas-liquid separator.

3. The phosphorus trichloride condensing system of claim 1, wherein, Both the primary heat exchanger (1) and the secondary heat exchanger (2) are vertical shell-and-tube heat exchangers.

4. The phosphorus trichloride condensing system of claim 1, wherein, The primary heat exchanger (1) and the secondary heat exchanger (2) each include a shell (13), an upper partition (14), a lower partition (15), and a plurality of heat exchange tubes (16). The upper partition (14) and the lower partition (15) are respectively installed inside the outer shell (13). The upper partition (14) and the lower partition (15) divide the outer shell (13) to form an upper chamber (17) above the upper partition (14), a material chamber (18) between the upper partition (14) and the lower partition (15), and a lower chamber (19) below the lower partition (15). The heat exchange tube (16) is installed in the material chamber (18). The upper end of the heat exchange tube (16) is connected to the upper partition (14) and communicates with the upper chamber (17). The lower end of the heat exchange tube (16) is connected to the lower partition (15) and communicates with the lower chamber (19). The feed inlet (8), the drain outlet (9), the exhaust outlet (10), the medium inlet (11), and the medium outlet (12) are all located on the outer shell (13). The feed inlet (8) is connected to the lower end of the material chamber (18), the drain outlet (9) is connected to the lower end of the material chamber (18), the exhaust outlet (10) is connected to the upper end of the material chamber (18), the medium inlet (11) is connected to the upper chamber (17), and the medium outlet (12) is connected to the lower chamber (19).

5. The phosphorus trichloride condensing system of claim 4, wherein, The heat exchange tube (16) has multiple outer fins (20) arranged sequentially from top to bottom on its outer wall.

6. The phosphorus trichloride condensing system of claim 4, wherein, The heat exchange tube (16) has inner fins (21) on its inner wall.

7. The phosphorus trichloride condensing system of claim 6, wherein, The inner fins (21) extend along the axial direction of the heat exchange tube (16), and at least two inner fins (21) are arranged sequentially at intervals along the circumference of the heat exchange tube (16).

8. The phosphorus trichloride condensing system of claim 4, wherein, The primary heat exchanger (1) and the secondary heat exchanger (2) also include a sealing plate (22) and a floating component (23), respectively. The sealing plate (22) is slidably connected to the outer shell (13) and fits against the inner wall of the outer shell (13). The sealing plate (22) has a closed position that slides down to block the drain port (9) and an open position that slides up to open the drain port (9). The floating component (23) is connected to the sealing plate (22). The floating component (23) is used to float up and down as the liquid level of phosphorus trichloride liquid in the material chamber (18) rises and falls, thereby driving the sealing plate (22) to slide up and down.

9. The phosphorus trichloride condensing system of claim 8, wherein, The inner wall of the outer shell (13) is provided with an upper limit block (24) and a lower limit block (25). The lower limit block (25) is located below the sealing plate (22) and is used to abut against the sealing plate (22) when the sealing plate (22) slides down to the closed position to limit the sealing plate (22) from continuing to move downward; The upper limit block (24) is located above the sealing plate (22) and is used to abut against the sealing plate (22) when the sealing plate (22) slides upward to the open position to limit the sealing plate (22) from moving further upward.

10. The phosphorus trichloride condensing system of claim 8, wherein, The inner wall of the outer shell (13) is connected to a left guide rail (26) and a right guide rail (27). A left sliding groove (28) is provided between the right end of the left guide rail (26) and the outer shell (13), and a right sliding groove (29) is provided between the left end of the right guide rail (27) and the outer shell (13). The left side of the sealing plate (22) slides up and down in the left sliding groove (28), and the right side of the sealing plate (22) slides up and down in the right sliding groove (29).

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