A cold deactivation auto-switch auto-activation system and method

Abstract

This invention discloses an automatic switching and activation system and method for cold deactivation, belonging to the field of cold deactivation technology. It includes a feed VDF secondary cold deactivator, a working VDF secondary cold deactivator, a standby VDF secondary cold deactivator, a feed F142b collection tank, a working F142b collection tank, a standby F142b collection tank, and an F142b discharge pump. The feed VDF secondary cold deactivator, working VDF secondary cold deactivator, and standby VDF secondary cold deactivator are respectively connected to the feed F142b collection tank, working F142b collection tank, and standby F142b collection tank. Bottom discharge valves are fixedly installed at the bottom of the feed VDF secondary cold deactivator, working VDF secondary cold deactivator, and standby VDF secondary cold deactivator. Through the above method, this invention can automate most of the process, requiring only one person to operate, saving manpower, time, and speeding up the operation process, thus reducing the impact on the production process.

Description

Technical Field

[0001] This invention relates to the field of cold deactivation technology, specifically to an automatic switching and automatic activation system and method for cold deactivation. Background Technology

[0002] Because the system contains moisture, it can cause ice blockage in subsequent cold stripping processes. When the distillation station detects that the pressure difference in the secondary cold stripping stage has increased to 2 kPa, it notifies the external workshop to begin replacing and activating the secondary cold stripping stage. The activation process involves transferring the used cold stripping material to the standby cold stripping stage, while the existing cold stripping stage is activated and de-iced by introducing hot brine.

[0003] In existing technologies, the operation of cold deactivation systems is basically manual and requires two people to operate, one on the third floor and the other on the second floor.

[0004] Based on this, the present invention designs an automatic switching automatic activation system and method for cold deactivation to solve the above problems. Summary of the Invention

[0005] In view of the above-mentioned shortcomings of the existing technology, the present invention provides an automatic switching automatic activation system and method for cold deactivation.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] An automatic switching and activation system for cold deactivation includes a feed VDF secondary cold deactivator, a working VDF secondary cold deactivator, a standby VDF secondary cold deactivator, a feed F142b collection tank, a working F142b collection tank, a standby F142b collection tank, and an F142b discharge pump. The feed VDF secondary cold deactivator, the working VDF secondary cold deactivator, and the standby VDF secondary cold deactivator are respectively connected to the feed F142b collection tank, the working F142b collection tank, and the standby F142b collection tank. Bottom discharge valves are fixedly installed at the bottom of the feed VDF secondary cold deactivator, the working VDF secondary cold deactivator, and the standby VDF secondary cold deactivator.

[0008] There are multiple VDF secondary cold strippers and multiple F142b collection tanks. The VDF secondary cold strippers are connected to the F142b collection tanks. The feed end of the VDF secondary cold strippers is connected to the feed pipe.

[0009] The working VDF secondary cold stripper and the standby VDF secondary cold stripper are connected in parallel and are both connected to the discharge end of the material passing VDF secondary cold stripper. The air outlets of the working VDF secondary cold stripper and the standby VDF secondary cold stripper are both connected to the gas phase buffer tank.

[0010] Bottom discharge valves are fixedly installed on the bottom discharge pipes of the F142b collection tank, the working F142b collection tank, and the spare F142b collection tank. The bottom discharge pipes are respectively connected to the wastewater buffer tank and the F142b discharge pump. A drain valve is fixedly installed on the connecting pipe between the bottom discharge pipe and the wastewater buffer tank.

[0011] The discharge port of the F142b discharge pump is connected to the return pipes of the VDF recovery tower, the working F142b collection tank, and the standby F142b collection tank, respectively. Each return pipe is equipped with a return balance valve. A pneumatic valve for entering the VDF recovery tower is fixedly installed on the connection pipe between the discharge port of the F142b discharge pump and the VDF recovery tower.

[0012] Both the VDF two-stage cold stripper C and the VDF two-stage cold stripper D are fixedly installed with brine inlet pipes and brine return pipes. The brine inlet pipe is connected to the hot brine inlet pipe and the brine supply pipe, and the brine return pipe is connected to the brine return pipe and the hot brine return pipe. Hot brine activation inlet and return valves are fixedly installed on both the hot brine inlet pipe and the hot brine return pipe. Cold brine inlet and return valves are fixedly installed on both the brine supply pipe and the brine return pipe.

[0013] The F142b discharge pump, D inlet valve, C discharge valve, C inlet valve, D discharge valve, cold brine inlet / outlet valve, hot brine activation inlet / outlet valve, bottom discharge valve, water discharge valve, reflux balancing valve, pneumatic valve for VDF recovery tower, and bottom discharge valve are all electric shut-off valves. The electric shut-off valves are connected to the controller, and the controller is connected to a one-button material transfer button.

[0014] Furthermore, the material handling VDF secondary cold stripper consists of VDF secondary cold stripper A and VDF secondary cold stripper B connected in series; VDF secondary cold stripper A and VDF secondary cold stripper B are respectively connected to F142b collection tank A and F142b collection tank B; the feed end of VDF secondary cold stripper A is connected to the feed pipe.

[0015] Furthermore, the working VDF secondary cold stripper is VDF secondary cold stripper C, and the standby VDF secondary cold stripper is VDF secondary cold stripper D; VDF secondary cold stripper C and VDF secondary cold stripper D are connected to F142b collection tank C and F142b collection tank D respectively.

[0016] Furthermore, the feed end of the VDF secondary cold stripper C is connected to the discharge end of the VDF secondary cold stripper B, and a feed valve C is fixedly installed on the connecting pipeline; the gas outlet end of the VDF secondary cold stripper C is connected to the gas phase buffer tank, and a discharge valve C is fixedly installed on the connecting pipeline.

[0017] The feed end of VDF secondary cold stripper D is connected to the discharge end of VDF secondary cold stripper B, and feed valve D is fixedly installed on the connecting pipeline; the gas outlet end of VDF secondary cold stripper D is connected to the gas phase buffer tank, and discharge valve D is fixedly installed on the connecting pipeline.

[0018] Furthermore, the inlet and outlet of the F142b discharge pump are connected to the cooling water supply pipe and return pipe, respectively.

[0019] Furthermore, the brine inlet pipe is connected to the 60℃ hot brine inlet pipe and the -35℃ brine supply pipe, and the brine return pipe is connected to the -35℃ brine return pipe and the 60℃ hot brine return pipe; hot brine activation inlet and return valves are fixedly installed on both the 60℃ hot brine inlet pipe and the 60℃ hot brine return pipe; cold brine inlet and return valves are fixedly installed on both the -35℃ brine supply pipe and the -35℃ brine return pipe.

[0020] A method for automatic switching and automatic activation during cold deactivation includes the following steps:

[0021] 1. When the secondary cooling pressure difference of VDF secondary cooling desorber C reaches 2kPa, the internal operator presses the one-key transfer button to transfer materials between VDF secondary cooling desorber C and VDF secondary cooling desorber D.

[0022] 2. Open the discharge valve of the VDF secondary cold stripper D to balance the pressure;

[0023] 3. Open the reflux balance valve of F142b collection tank D, open the F142b discharge pump, close the pneumatic valve for entering the VDF recovery tower, and transfer the material from F142b collection tank C to F142b collection tank D; perform the material transfer.

[0024] 4. After the material transfer is completed, open the drain valve of the F142b collection tank C to recover the material to the wastewater buffer tank, and close the drain valve after the pressure is released to 0.15Mpa.

[0025] 5. Next, open the cold brine inlet / outlet valve of VDF secondary cold desorber D, close the cold brine inlet / outlet valve of VDF secondary cold desorber C, open the D feed valve of VDF secondary cold desorber D, close the C feed valve of VDF secondary cold desorber C, open the bottom discharge valve of VDF secondary cold desorber D, close the bottom discharge valve of VDF secondary cold desorber C, and open the pneumatic valve for VDF recovery tower.

[0026] 6. Close the discharge valve of VDF secondary cold desorber C, open the hot brine activation inlet and outlet valve of VDF secondary cold desorber C, turn on the activation pump, and slowly introduce steam to heat the activation tank to 50-60°C. The hot brine enters VDF secondary cold desorber C3 for circulation activation. After activation, close the activation pump and the hot brine activation inlet and outlet valve.

[0027] 7. Open the drain valve of collection tank C of F142b to drain the water. After the pressure drops to 0.15Mpa, it is ready for use.

[0028] 8. Close the drain valve of collection tank C of F142b.

[0029] Furthermore, before transferring the material, it is necessary to observe that the pressure of the F142b collection tank D is 0.15 MPa. If it exceeds 0.15 MPa, the drain valve of the F142b collection tank D should be opened to drain the water so that the pressure of the F142b collection tank D is controlled below 0.15 MPa.

[0030] Furthermore, the material transfer ends when the pressure in the F142b collection tank D reaches 0.3 MPa, the liquid level in the F142b collection tank C is 0, and the liquid level at the outlet is the same as the liquid level at the inlet of the F142b collection tank D.

[0031] Furthermore, in step six, the cooling rate of the VDF secondary cold stripper C is no more than 30-50℃ / h; activation ends after 3-4 hours.

[0032] Beneficial effects

[0033] This invention can automate most processes, requiring only one person to operate, saving manpower, saving time, speeding up the operation process, and helping to reduce the impact on the production process. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0035] Figure 1 This is a diagram of an automatic switching and automatic activation system for cold deactivation according to the present invention.

[0036] The labels in the diagram represent:

[0037] 1. VDF Secondary Cold Desorber A 2. VDF Secondary Cold Desorber B 3. VDF Secondary Cold Desorber C 4. VDF Secondary Cold Desorber D 5. F142b Collection Tank A 6. F142b Collection Tank B 7. F142b Collection Tank C 8. F142b Collection Tank D 9. F142b Discharge Pump 10. D Inlet Valve 11. C Discharge Valve 12. C Inlet Valve 13. D Discharge Valve 14. Cold Brine Inlet / Outlet Valve 15. Hot Brine Activation Inlet / Outlet Valve 16. Bottom Discharge Valve 17. Drain Valve 18. Reflux Balancing Valve 19. Pneumatic Valve for VDF Recovery Tower Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0039] The present invention will be further described below with reference to embodiments.

[0040] Example 1

[0041] Please refer to the instruction manual appendix. Figure 1 An automatic switching and activation system for cold deactivation includes a feed VDF secondary cold deactivator, a working VDF secondary cold deactivator, a standby VDF secondary cold deactivator, a feed F142b collection tank, a working F142b collection tank, a standby F142b collection tank, and an F142b discharge pump; the feed VDF secondary cold deactivator, the working VDF secondary cold deactivator, and the standby VDF secondary cold deactivator are respectively connected to the feed F142b collection tank, the working F142b collection tank, and the standby F142b collection tank;

[0042] The bottom of the feed VDF secondary cold stripper, the working VDF secondary cold stripper, and the standby VDF secondary cold stripper are all fixedly installed with bottom discharge valves;

[0043] There are multiple VDF secondary cold strippers and multiple F142b collection tanks. For example, in this embodiment, the VDF secondary cold strippers are VDF secondary cold strippers A1 and VDF secondary cold strippers 2B connected in series. VDF secondary cold strippers A1 and VDF secondary cold strippers 2B are respectively connected to F142b collection tanks A5 and B6. The feed end of VDF secondary cold stripper A1 is connected to the feed pipe.

[0044] The working VDF secondary cold stripper and the standby VDF secondary cold stripper are connected in parallel and are both connected to the discharge end of the material-passing VDF secondary cold stripper; for example, in this embodiment, the working VDF secondary cold stripper is VDF secondary cold stripper C3 and the standby VDF secondary cold stripper is VDF secondary cold stripper D4; VDF secondary cold stripper C3 and VDF secondary cold stripper D4 are respectively connected to F142b collection tank C7 and F142b collection tank D8;

[0045] The feed end of VDF secondary cold stripper C3 is connected to the discharge end of VDF secondary cold stripper 2B, and feed valve 12 is fixedly installed on the connecting pipeline; the gas outlet end of VDF secondary cold stripper C3 is connected to the gas phase buffer tank, and discharge valve 11 is fixedly installed on the connecting pipeline.

[0046] The feed end of the VDF secondary cold stripper D4 is connected to the discharge end of the VDF secondary cold stripper 2B, and a feed valve 10 is fixedly installed on the connecting pipeline; the gas outlet end of the VDF secondary cold stripper D4 is connected to the gas phase buffer tank, and a discharge valve 13 is fixedly installed on the connecting pipeline.

[0047] The material (gas phase VDF + F142b) enters VDF secondary cold stripper A1 and VDF secondary cold stripper 2B in sequence, and then enters VDF secondary cold stripper C3 or VDF secondary cold stripper D4. After cooling, gas phase VDF enters gas phase buffer tank, and F142b enters F142b collection tank C7 or F142b collection tank D8.

[0048] Bottom discharge valves 16 are fixedly installed on the bottom discharge pipes of the F142b collection tank, the working F142b collection tank, and the spare F142b collection tank. The bottom discharge pipes are respectively connected to the wastewater buffer tank and the F142b discharge pump 9. A drain valve 17 is fixedly installed on the connecting pipe between the bottom discharge pipe and the wastewater buffer tank.

[0049] The discharge port of F142b discharge pump 9 is connected to the return pipes of VDF recovery tower, F142b collection tank C7 and F142b collection tank D8 respectively. Return balance valves 18 are installed on the return pipes of F142b collection tank C7 and F142b collection tank D8. A pneumatic valve 19 for entering VDF recovery tower is fixedly installed on the connection pipe between the discharge port of F142b discharge pump 9 and VDF recovery tower.

[0050] Both the VDF secondary cold stripper C3 and the VDF secondary cold stripper D4 are fixedly equipped with brine inlet pipes and brine return pipes. The brine inlet pipe is connected to the 60℃ hot brine inlet pipe and the -35℃ brine supply pipe, and the brine return pipe is connected to the -35℃ brine return pipe and the 60℃ hot brine return pipe. Hot brine activation inlet and return valves 15 are fixedly installed on both the 60℃ hot brine inlet pipe and the 60℃ hot brine return pipe. Cold brine inlet and return valves 14 are fixedly installed on both the -35℃ brine supply pipe and the -35℃ brine return pipe.

[0051] The inlet and outlet of the F142b discharge pump 9 are connected to the cooling water supply pipe and return pipe, respectively, to achieve the cooling effect of the F142b discharge pump 9.

[0052] The F142b discharge pump 9, D inlet valve 10, C discharge valve 11, C inlet valve 12, D discharge valve 13, cold brine inlet / outlet valve 14, hot brine activation inlet / outlet valve 15, bottom discharge valve 16, water discharge valve 17, reflux balancing valve 18, VDF recovery tower pneumatic valve 19, and bottom discharge valve are all electric shut-off valves. The electric shut-off valves are connected to the controller, which is connected to a one-button material transfer button, which can realize automatic operation and one-button material transfer operation.

[0053] When the secondary cooling pressure difference of VDF secondary cooling stripper C3 reaches 2kPa, the internal operator presses the one-key transfer button to transfer VDF secondary cooling stripper C3 and VDF secondary cooling stripper D4. Before transferring, it is necessary to observe that the pressure of F142b collection tank D8 is 0.15Mpa. If it exceeds 0.15Mpa, the drain valve 17 of F142b collection tank D8 should be opened to drain water so that the pressure of F142b collection tank D8 is controlled below 0.15Mpa.

[0054] Open the discharge valve 13 of the VDF secondary cold stripper D4 to balance the pressure;

[0055] Open the reflux balancing valve 18 of the F142b collection tank D8, start the F142b discharge pump 9, close the pneumatic valve 19 at the VDF recovery tower, and transfer the material from the F142b collection tank C7 to the F142b collection tank D8; when the pressure in the F142b collection tank D8 reaches 0.3 MPa, the liquid level in the F142b collection tank C7 is 0, and the discharge liquid level is the same as the discharge liquid level in the F142b collection tank D8, the material transfer ends.

[0056] After the material transfer is completed, open the drain valve 17 of the F142b collection tank C7 to recover the material to the wastewater buffer tank, and close the drain valve 17 after the pressure is released to 0.15 MPa.

[0057] Next, open the cold brine inlet / outlet valve 14 of VDF secondary cold desorber D4 (open the -35℃ brine return pipe and -35℃ brine return pipe during operation), close the cold brine inlet / outlet valve 14 of VDF secondary cold desorber C3, open the D feed valve 10 of VDF secondary cold desorber D4, close the C feed valve 12 of VDF secondary cold desorber C3, open the bottom discharge valve of VDF secondary cold desorber D4, close the bottom discharge valve of VDF secondary cold desorber C3, and open the pneumatic valve 19 for entering the VDF recovery tower.

[0058] Close the discharge valve 11 of the VDF secondary cold desorber C3, open the hot brine activation inlet and outlet valve 15 of the VDF secondary cold desorber C3 (open the 60℃ hot brine inlet pipe during activation), turn on the activation pump, and slowly introduce steam to heat the activation tank to 50-60℃. The hot brine enters the VDF secondary cold desorber C3 for circulation activation. The cooling rate of the VDF secondary cold desorber C3 should not exceed 30-50℃ / h. After 3-4 hours, the activation is completed. Close the activation pump and the hot brine activation inlet and outlet valve 15.

[0059] Open the drain valve 17 of the F142b collection tank C7 to drain the water. After the pressure drops to 0.15 MPa, it is ready for use.

[0060] Close the drain valve 17 of the F142b collection tank C7;

[0061] This invention can automate most processes, requiring only one person to operate, saving manpower, saving time, speeding up the operation process, and helping to reduce the impact on the production process.

[0062] Example 2

[0063] Please refer to the instruction manual appendix. Figure 1 A method for automatic switching and automatic activation during cold deactivation includes the following steps:

[0064] 1. When the differential pressure of the secondary cold stripper C3 of VDF reaches 2 kPa, press the one-key transfer button in the internal operation to transfer the material between VDF secondary cold stripper C3 and VDF secondary cold stripper D4. Before transferring the material, observe that the pressure of F142b collection tank D8 should be 0.15 MPa. If it exceeds 0.15 MPa, open the drain valve 17 of F142b collection tank D8 to drain the water so that the pressure of F142b collection tank D8 is controlled below 0.15 MPa.

[0065] 2. Open the discharge valve 13 of the D4 of the VDF secondary cold stripper to balance the pressure;

[0066] 3. Open the reflux balancing valve 18 of F142b collection tank D8, open the F142b discharge pump 9, close the pneumatic valve 19 inlet to VDF recovery tower, and transfer the material from F142b collection tank C7 to F142b collection tank D8; when the pressure in F142b collection tank D8 reaches 0.3 MPa, the liquid level in F142b collection tank C7 is 0, and the liquid level at the discharge point is the same as the liquid level at the input point in F142b collection tank D8, the material transfer is complete.

[0067] 4. After the material transfer is completed, open the drain valve 17 of the F142b collection tank C7 to recover the material to the wastewater buffer tank, and close the drain valve 17 after the pressure is released to 0.15Mpa.

[0068] 5. Next, open the cold brine inlet / outlet valve 14 of VDF secondary cold desorber D4 (open the -35℃ brine return pipe and -35℃ brine return pipe during operation), close the cold brine inlet / outlet valve 14 of VDF secondary cold desorber C3, open the D feed valve 10 of VDF secondary cold desorber D4, close the C feed valve 12 of VDF secondary cold desorber C3, open the bottom discharge valve of VDF secondary cold desorber D4, close the bottom discharge valve of VDF secondary cold desorber C3, and open the pneumatic valve 19 for entering the VDF recovery tower.

[0069] 6. Close the discharge valve 11 of the VDF secondary cold desorber C3, open the hot brine activation inlet and outlet valve 15 of the VDF secondary cold desorber C3 (open the 60℃ hot brine inlet pipe during activation), turn on the activation pump, and slowly introduce steam to heat the activation tank to 50-60℃. The hot brine enters the VDF secondary cold desorber C3 for circulation activation (close the original -35℃ brine inlet pipe and switch to 60℃ hot brine). The cooling rate of the VDF secondary cold desorber C3 should not exceed 30-50℃ / h. After 3-4 hours, the activation is complete. Close the activation pump and the hot brine activation inlet and outlet valve 15.

[0070] 7. Open the drain valve 17 of the F142b collection tank C7 to drain the water. After the pressure drops to 0.15 MPa, it is ready for use.

[0071] 8. Close the drain valve 17 of the F142b collection tank C7.

[0072] This invention enables automated operation and one-click material transfer. Only one person is required to operate it, saving manpower and time, accelerating the operation process, and minimizing disruption to the production process.

[0073] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A cold deactivation auto-switch auto-activation system, characterized in that, It includes a feed VDF secondary cold stripper, a working VDF secondary cold stripper, a standby VDF secondary cold stripper, a feed F142b collection tank, a working F142b collection tank, a standby F142b collection tank, and an F142b discharge pump; The feed VDF secondary cold stripper, the working VDF secondary cold stripper, and the standby VDF secondary cold stripper are respectively connected to the feed F142b collection tank, the working F142b collection tank, and the standby F142b collection tank; a bottom discharge valve is fixedly installed at the bottom of the feed VDF secondary cold stripper, the working VDF secondary cold stripper, and the standby VDF secondary cold stripper. There are multiple VDF secondary cold strippers and multiple F142b collection tanks. The VDF secondary cold strippers are connected to the F142b collection tanks. The feed end of the VDF secondary cold strippers is connected to the feed pipe. The working VDF secondary cold stripper and the standby VDF secondary cold stripper are connected in parallel and are both connected to the discharge end of the material passing VDF secondary cold stripper. The air outlets of the working VDF secondary cold stripper and the standby VDF secondary cold stripper are both connected to the gas phase buffer tank. Bottom discharge valves (16) are fixedly installed on the bottom discharge pipes of the F142b collection tank, the working F142b collection tank, and the standby F142b collection tank. The bottom discharge pipes are connected to the wastewater buffer tank and the F142b discharge pump (9) respectively. A drain valve (17) is fixedly installed on the connecting pipe between the bottom discharge pipe and the wastewater buffer tank. The discharge port of the F142b discharge pump (9) is connected to the return pipes of the VDF recovery tower, the working F142b collection tank, and the spare F142b collection tank, respectively. A return balance valve (18) is installed on each of the return pipes. A pneumatic valve (19) for entering the VDF recovery tower is fixedly installed on the connection pipe between the discharge port of the F142b discharge pump (9) and the VDF recovery tower. Both the VDF two-stage cold stripper C (3) and the VDF two-stage cold stripper D (4) are fixedly equipped with brine inlet pipes and brine return pipes. The brine inlet pipe is connected to the hot brine inlet pipe and the brine supply pipe, and the brine return pipe is connected to the brine return pipe and the hot brine return pipe. Both the hot brine inlet pipe and the hot brine return pipe are fixedly equipped with hot brine activation inlet and return valves (15). Both the brine supply pipe and the brine return pipe are fixedly equipped with cold brine inlet and return valves (14). The F142b discharge pump (9), D feed valve (10), C discharge valve (11), C feed valve (12), D discharge valve (13), cold brine inlet / outlet valve (14), hot brine activation inlet / outlet valve (15), bottom discharge valve (16), drain valve (17), reflux balance valve (18), VDF recovery tower pneumatic valve (19), and bottom discharge valve are all electric shut-off valves. The electric shut-off valve is connected to the controller, and the controller is connected to a one-button material transfer button.

2. The cold deactivation auto-switch auto-activation system of claim 1, wherein, The material handling VDF secondary cold stripper consists of VDF secondary cold stripper A (1) and VDF secondary cold stripper B (2) connected in series; VDF secondary cold stripper A (1) and VDF secondary cold stripper B (2) are respectively connected to F142b collection tank A (5) and F142b collection tank B (6); the feed end of VDF secondary cold stripper A (1) is connected to the feed pipe.

3. The cold deactivation auto-switch auto-activation system of claim 2, wherein, The working VDF secondary cold stripper is VDF secondary cold stripper C (3), and the standby VDF secondary cold stripper is VDF secondary cold stripper D (4); VDF secondary cold stripper C (3) and VDF secondary cold stripper D (4) are connected to F142b collection tank C (7) and F142b collection tank D (8) respectively.

4. The cold deactivation auto-switch auto-activation system of claim 3, wherein, The feed end of VDF secondary cold stripper C (3) is connected to the discharge end of VDF secondary cold stripper (2) B, and feed valve C (12) is fixedly installed on the connecting pipe; the gas outlet end of VDF secondary cold stripper C (3) is connected to the gas phase buffer tank, and discharge valve C (11) is fixedly installed on the connecting pipe. The feed end of the VDF secondary cold stripper D (4) is connected to the discharge end of the VDF secondary cold stripper (2) B, and a feed valve (10) D is fixedly installed on the connecting pipeline; the gas outlet end of the VDF secondary cold stripper D (4) is connected to the gas phase buffer tank, and a discharge valve (13) D is fixedly installed on the connecting pipeline.

5. The cold deactivation auto-switch auto-activation system of claim 4, wherein, The inlet and outlet of the F142b discharge pump (9) are connected to the cooling water supply pipe and return pipe, respectively.

6. The automatic switching and automatic activation system for cold deactivation according to claim 5, characterized in that, The brine inlet pipe is connected to the 60℃ hot brine inlet pipe and the -35℃ brine supply pipe, and the brine return pipe is connected to the -35℃ brine return pipe and the 60℃ hot brine return pipe; hot brine activation inlet and return valves (15) are fixedly installed on the 60℃ hot brine inlet pipe and the 60℃ hot brine return pipe; cold brine inlet and return valves (14) are fixedly installed on the -35℃ brine supply pipe and the -35℃ brine return pipe.

7. A cold deactivation auto-switching auto-activation method using the cold deactivation auto-switching auto-activation system according to any one of claims 1 to 6, characterized by, Includes the following steps:

1. When the secondary cold stripping pressure difference of VDF secondary cold stripper C(3) reaches 2kPa, the internal operator presses the one-key transfer button to transfer VDF secondary cold stripper C(3) and VDF secondary cold stripper D(4); 2. Open the D discharge valve (13) of the VDF secondary cold stripper D (4) to balance the pressure; 3. Open the reflux balance valve (18) of the F142b collection tank D (8), open the F142b discharge pump (9), close the pneumatic valve (19) for entering the VDF recovery tower, and transfer the material from the F142b collection tank C (7) to the F142b collection tank D (8); perform the material transfer.

4. After the material transfer is completed, open the drain valve (17) of the F142b collection tank C (7) to recover the material to the wastewater buffer tank, and close the drain valve (17) after the pressure is released to 0.15Mpa.

5. Then, open the cold brine inlet / outlet valve (14) of the VDF secondary cold desorber D (4), close the cold brine inlet / outlet valve (14) of the VDF secondary cold desorber C (3), open the D feed valve (10) of the VDF secondary cold desorber D (4), close the C feed valve (12) of the VDF secondary cold desorber C (3), open the bottom discharge valve of the VDF secondary cold desorber D (4), close the bottom discharge valve of the VDF secondary cold desorber C (3), and open the pneumatic valve (19) for entering the VDF recovery tower.

6. Close the C discharge valve (11) of the VDF secondary cold desorber C (3), open the hot brine activation inlet and outlet valve (15) of the VDF secondary cold desorber C (3), and the hot brine enters the VDF secondary cold desorber C3 for activation; after activation, close the activation pump and the hot brine activation inlet and outlet valve (15).

7. Open the drain valve (17) of the F142b collection tank C (7) to drain the water. After the pressure drops to 0.15Mpa, it is ready for use.

8. Close the drain valve (17) of the F142b collection tank C (7).

8. The cold deactivation auto-switch activation method of claim 7, wherein, Before transferring the material, it is necessary to observe that the pressure of the F142b collection tank D (8) is 0.15 MPa. If it exceeds 0.15 MPa, the drain valve (17) of the F142b collection tank D (8) should be opened to drain the water so that the pressure of the F142b collection tank D (8) is controlled below 0.15 MPa.

9. The cold deactivation auto-switch activation method of claim 8, wherein, When the pressure in the F142b collection tank D (8) reaches 0.3 MPa, the liquid level in the F142b collection tank C (7) is 0, and the liquid level at the outlet is the same as the liquid level at the inlet of the F142b collection tank D (8), the material transfer ends.

10. The cold deactivation auto-switch auto-activation method of claim 9, wherein, In step six, the cooling rate of the VDF secondary cold stripper C(3) is no more than 30~50℃ / h; activation ends after 3~4 hours.

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