Replacement system

Abstract

The utility model provides a replacement system, and relates to the technical field of refrigerant synthesis heat recovery. The replacement system comprises a heat recovery unit, the heat recovery unit comprises a refrigerant synthesis tower and a first pipeline, the refrigerant synthesis tower is filled with a catalyst, the refrigerant synthesis tower comprises a gas inlet and a gas outlet, the first pipeline is communicated with the gas inlet, and the first pipeline is used for conveying inert gas into the refrigerant synthesis tower; the second pipeline is communicated with the gas outlet, and a synthesis system replacement unit, a refrigeration system replacement unit and a processing unit are sequentially arranged on the second pipeline from the refrigerant synthesis tower as a starting point; wherein the inert gas can enter the refrigerant synthesis tower through the first pipeline, exchanges heat with the catalyst, is discharged from the refrigerant synthesis tower, and sequentially enters the synthesis system replacement unit, the refrigeration system replacement unit and the processing unit through the second pipeline. According to the technical scheme, the refrigerant discharge time can be shortened, and the maintenance time is greatly shortened.

Description

Technical Field

[0001] The present disclosure relates to the technical field of refrigerant synthesis heat recovery, and in particular to a replacement system. Background Art

[0002] During the refrigerant production process, hydrogen and nitrogen react exothermically in a synthesis tower under the influence of a catalyst, producing a gaseous refrigerant. This process involves the synthesis and conversion of the refrigerant, commonly referred to as the synthesis system and the refrigeration system. When a plant requires downtime for maintenance, the refrigerant must be drained from these systems to prevent explosions or fires caused by sparks, static electricity, and other factors during the maintenance process due to the refrigerant's flammable and explosive properties.

[0003] Current technology first reduces the system's internal pressure to near atmospheric pressure by opening the system's pressure reducing valve. Dedicated connecting pipes are then used to connect refrigerant recovery equipment to the system's high- and low-pressure sides. The equipment is then turned on to extract the refrigerant from the system and deposit it into a recovery container. Finally, a vacuum pump is used to evacuate the system to remove air and moisture. However, due to the complex and complex system architecture, this process is inefficient and takes a long time to complete.

[0004] Therefore, a replacement system is needed to at least solve the above problems. Utility Model Content

[0005] The purpose of the embodiments of the present disclosure is to provide a replacement system to solve the problem in the prior art that the refrigerant discharge process is complicated and time-consuming due to the complexity of the system, which in turn leads to a long maintenance time.

[0006] To solve the above technical problems, the present disclosure provides the following technical solutions:

[0007] The present disclosure provides a replacement system, comprising: a heat recovery unit, the heat recovery unit comprising a refrigerant synthesis tower and a first pipeline, the refrigerant synthesis tower is filled with a catalyst, the refrigerant synthesis tower comprises an air inlet and an air outlet, the first pipeline is connected to the air inlet, and the first pipeline is used to transport inert gas into the refrigerant synthesis tower; a second pipeline, the second pipeline is connected to the air outlet, and a synthesis system replacement unit, a refrigeration system replacement unit, and a processing unit are sequentially arranged on the second pipeline starting from the refrigerant synthesis tower; wherein the inert gas can enter the refrigerant synthesis tower through the first pipeline, exchange heat with the catalyst, and be discharged from the refrigerant synthesis tower and enter the synthesis system replacement unit, the refrigeration system replacement unit, and the processing unit in sequence through the second pipeline.

[0008] In some embodiments of the present disclosure, the synthesis system replacement unit includes a heat exchanger, a condenser, and a separator arranged in sequence, and the inert gas enters the heat exchanger, the condenser, and the separator in sequence through the second pipeline.

[0009] In some embodiments of the present disclosure, the refrigeration system replacement unit includes a medium-pressure flash tank, a low-pressure flash tank and a liquid collecting tank arranged in sequence, and the inert gas enters the medium-pressure flash tank, the low-pressure flash tank and the liquid collecting tank in sequence through the second pipeline.

[0010] In some embodiments of the present disclosure, the replacement system further includes: a first valve, which is arranged on the first pipeline and is used to control the on-off of the first pipeline; a second valve, which is arranged on the second pipeline and is located between the separator and the medium-pressure flash tank, and is used to control the on-off between the separator and the medium-pressure flash tank.

[0011] In some embodiments of the present disclosure, the replacement system further includes: a third valve, which is arranged on a third pipeline, and the third pipeline is connected to the second pipeline between the second valve and the medium-pressure flash tank, and the third valve is used to collect the inert gas for measuring the refrigerant content in the inert gas.

[0012] In some embodiments of the present disclosure, the replacement system further includes: a fourth pipeline, the inlet end of the fourth pipeline being connected to the medium-pressure flash tank, and the outlet end of the fourth pipeline being connected to the liquid collecting tank; a refrigeration compressor system replacement unit, the refrigeration compressor system replacement unit being arranged on the fourth pipeline, and part of the inert gas can enter the refrigeration compressor system replacement unit via the fourth pipeline at the medium-pressure flash tank.

[0013] In some embodiments of the present disclosure, the refrigeration compressor system replacement unit includes a refrigerant flash tank and a refrigeration compressor replacement module arranged in sequence, and part of the inert gas enters the refrigerant flash tank and the refrigeration compressor replacement module in sequence.

[0014] In some embodiments of the present disclosure, the refrigeration compressor replacement module includes a refrigeration compressor having a first section, a second section, and a third section; further including a first-stage separation tank, a second-stage separation tank, a third-stage separation tank, a first-stage heat exchange device, a second-stage heat exchange device, and a third-stage heat exchange device;

[0015] Part of the inert gas can enter the first-stage separation tank, the first section, the first-stage heat exchange device, the second-stage separation tank, the second section, the second-stage heat exchange device, the third-stage separation tank, the third section, the third-stage heat exchange device and the liquid collection tank in sequence from the refrigerant flash tank via the fourth pipeline.

[0016] In some embodiments of the present disclosure, the replacement system further comprises a control unit electrically connected with the first valve, the second valve and the third valve respectively, for remotely controlling the opening and closing of the first valve, the second valve and the third valve; the control unit is in communication connection with the heat exchanger, the one-stage heat exchange device, the two-stage heat exchange device and the three-stage heat exchange device respectively, for remotely controlling the temperature of the heat exchanger, the one-stage heat exchange device, the two-stage heat exchange device and the three-stage heat exchange device.

[0017] In some embodiments of the present disclosure, the processing unit is a torch system.

[0018] Compared with the prior art, the replacement system provided by the present disclosure forms an orderly replacement process by setting a heat recovery unit, a synthesis system replacement unit, a refrigeration system replacement unit and a processing unit. The synthesis system and the refrigeration system are orderly replaced by using inert gas as the replacement medium. The flow path of the inert gas is clear, starting from the refrigerant synthesis column and passing through each unit in turn, so that the discharge process is clearer and more efficient. The efficient replacement process shortens the time required for refrigerant discharge, providing more time for maintenance personnel to perform system maintenance. The problem of chaotic and time-consuming discharge process caused by complex system in the traditional method is solved. BRIEF DESCRIPTION OF DRAWINGS

[0019] The above and other objects, features and advantages of the exemplary embodiments of the present disclosure will be more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which several embodiments of the present disclosure are shown by way of example, and wherein like or corresponding elements refer to like or corresponding parts throughout the several figures, in which:

[0020] Figure 1 The structural schematic diagram of the replacement system of the embodiment of the present disclosure is schematically shown.

[0021] BRIEF DESCRIPTION OF DRAWINGS

[0022] 1, refrigerant synthesis column; 2, first pipeline; 3, second pipeline; 4, heat exchanger; 5, condenser; 6, separator; 7, medium-pressure flash tank; 8, low-pressure flash tank; 9, liquid collection tank; 10, first valve; 11, second valve; 12, third valve; 13, fourth pipeline; 14, refrigerant flash tank; 15, refrigeration compressor; 1501, first stage; 1502, second stage; 1503, third stage; 16, one-stage separation tank; 17, two-stage separation tank; 18, three-stage separation tank; 19, one-stage heat exchange device; 20, two-stage heat exchange device; 21, three-stage heat exchange device; 22, processing unit. DETAILED DESCRIPTION

[0023] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. Rather, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0024] It should be noted that, unless otherwise specified, the technical or scientific terms used in the present disclosure should have the common meanings understood by those skilled in the art to which the present disclosure belongs.

[0025] Example 1

[0026] In order to solve the problems existing in the prior art, the present disclosure provides a replacement system, such as Figure 1 As shown, it includes: a heat recovery unit, the heat recovery unit includes a refrigerant synthesis tower 1 and a first pipeline 2, the refrigerant synthesis tower 1 is filled with a catalyst, the refrigerant synthesis tower 1 includes an air inlet and an air outlet, the first pipeline 2 is connected to the air inlet, and the first pipeline 2 is used to transport inert gas into the refrigerant synthesis tower 1; a second pipeline 3, the second pipeline 3 is connected to the air outlet, and the second pipeline 3 is sequentially provided with a synthesis system replacement unit, a refrigeration system replacement unit, and a processing unit 22 starting from the refrigerant synthesis tower 1; wherein, the inert gas can enter the refrigerant synthesis tower 1 through the first pipeline 2, exchange heat with the catalyst, and be discharged from the refrigerant synthesis tower 1 through the second pipeline 3 to enter the synthesis system replacement unit, the refrigeration system replacement unit and the processing unit 22 in sequence.

[0027] The refrigerant synthesis tower 1 in the heat recovery unit is filled with a catalyst. An inert gas is delivered to the tower via a first pipeline 2. Due to its chemical stability, the inert gas does not react with the substances within the tower, but it can serve as a heat transfer medium. Once inside the tower, the inert gas exchanges heat with the catalyst, absorbing the catalyst's heat. The refrigerant synthesis tower 1 can utilize conventional equipment.

[0028] The synthesis system replacement unit is connected to the outlet of the refrigerant synthesis tower 1 via a second pipeline 3. After the inert gas is discharged from the refrigerant synthesis tower 1, it first enters the synthesis system replacement unit. Here, the high-temperature inert gas enters the synthesis system replacement unit, where its fluidity and high temperature propel residual refrigerant and other substances (such as unreacted raw materials and byproducts) out of the synthesis system, preparing for system maintenance.

[0029] The refrigeration system displacement unit is located after the synthesis system displacement unit and is also connected via a second pipeline 3. The inert gas displaced by the synthesis system continues to enter the refrigeration system displacement unit to displace the refrigerant and other substances in the refrigeration system. The processing unit 22 is located at the end of the second pipeline 3. The inert gas and displaced substances carried by the refrigeration system displacement unit enter the processing unit 22 for processing, such as filtration and separation, to ensure that the discharged gas meets environmental requirements.

[0030] By setting up a heat recovery unit, a synthesis system replacement unit, a refrigeration system replacement unit and a processing unit 22, an orderly replacement process is formed. The inert gas relies on its chemical stability to prevent unnecessary chemical reactions, and uses its physical fluidity to achieve dilution and removal of the original gas, thereby providing a safe and controllable environment for subsequent operations or maintenance. The inert gas passes through each unit in turn, gradually replacing the refrigerant and other substances in the complex system, avoiding the problem of chaotic and time-consuming discharge process caused by the complexity of the system in traditional methods. Because the refrigerant discharge process is more efficient, maintenance personnel can inspect and repair the system more quickly, greatly shortening the maintenance time. The inert gas exchanges heat with the catalyst in the refrigerant synthesis tower 1, recovers the heat of the catalyst, and improves energy utilization efficiency.

[0031] The disclosed embodiment of the present invention utilizes an inert gas as a replacement medium by setting up a special replacement system to replace the synthesis system and the refrigeration system in an orderly manner. The flow path of the inert gas is clear, starting from the refrigerant synthesis tower 1 and passing through each unit in sequence, making the discharge process clearer and more efficient. The efficient replacement process shortens the time required for refrigerant discharge, providing maintenance personnel with more time to perform system maintenance. At the same time, the simplified process also reduces the difficulty of maintenance and further reduces maintenance time.

[0032] In some embodiments, the replacement unit also includes a gas source device for providing a high-flow, high-pressure inert gas, such as nitrogen or argon. These gases are non-flammable and chemically stable, making them suitable as replacement gases. Due to their high flow rate and pressure, high-pressure inert gas can more effectively propel gas into every corner of the equipment, including hard-to-reach corners. Furthermore, the use of high-flow, high-pressure gas can accelerate the movement of gas molecules, thereby increasing the replacement speed, shortening the replacement time, reducing incomplete replacement caused by slow gas diffusion, and improving overall maintenance efficiency.

[0033] In some embodiments, the replacement unit of the synthesis system includes a heat exchanger 4 , a condenser 5 , and a separator 6 arranged in sequence, and the inert gas enters the heat exchanger 4 , the condenser 5 , and the separator 6 in sequence through the second pipeline 3 .

[0034] In the synthetic system replacement unit, the inert gas flows through each device in the following order: after being discharged from the refrigerant synthesis tower 1, the inert gas first enters the heat exchanger 4. In the heat exchanger 4, the inert gas can exchange heat with other fluids to adjust its temperature, making it more suitable for subsequent processing. For example, if the inert gas temperature is high, it can pass through the heat exchanger 4 to transfer heat to other fluids that need to be heated, thereby reducing its own temperature. After passing through the heat exchanger 4, the inert gas enters the condenser 5. In the condenser 5, some condensable components in the inert gas can be condensed into liquid. For example, if there are some substances in the synthesis system that can be condensed under certain conditions, the condenser 5 will condense them for subsequent separation processing. The inert gas carrying the condensed liquid and other impurities that may exist from the condenser 5 enters the separator 6. The separator 6 separates the liquid and gas by physical methods such as centrifugal force, gravity, etc., so that the inert gas is more pure to continue to flow to the refrigeration system replacement unit. The heat exchanger 4, condenser 5 and separator 6 can use devices in the prior art.

[0035] By sequentially arranging the heat exchanger 4, condenser 5 and separator 6, the inert gas is gradually processed to effectively remove impurities and condensable components, improving the replacement effect of the inert gas on the synthetic system replacement unit. Ensure that the refrigerant and other substances in the synthesis system are more thoroughly replaced, providing better conditions for subsequent maintenance and maintenance. The arrangement of the heat exchanger 4 can realize energy recovery and utilization, improving the energy efficiency of the system. The synergistic effect of the condenser 5 and the separator 6 can ensure that the inert gas entering the refrigeration system replacement unit is more pure, reducing the adverse effects on the refrigeration system replacement unit, thereby optimizing the performance of the entire replacement system. The cooperative work of each device in the synthetic system replacement unit can reduce the risk of system failure and improve the reliability and stability of the system.

[0036] In some embodiments, the refrigeration system replacement unit includes a medium-pressure flash tank 7, a low-pressure flash tank 8 and a liquid collection tank 9 arranged in sequence, and the inert gas enters the medium-pressure flash tank 7, the low-pressure flash tank 8 and the liquid collection tank 9 in sequence via the second pipeline 3.

[0037] The inert gas from the synthetic system displacement unit first enters the medium-pressure flash tank 7 in the refrigeration system displacement unit via the second pipeline 3. In the medium-pressure flash tank 7, due to the change in pressure, the substances in the inert gas are preliminarily separated. Some components that are easily volatile under medium-pressure conditions will escape from the liquid and mix with the inert gas. For example, part of the refrigerant in the refrigeration system displacement unit may vaporize in the medium-pressure flash tank 7 due to the change in pressure and continue to flow with the inert gas. The gas and possibly entrained liquid from the medium-pressure flash tank 7 then enter the low-pressure flash tank 8. In the low-pressure flash tank 8, further reduced pressure causes more volatile components to separate from the liquid. For example, the remaining small amount of refrigerant is more easily vaporized under low-pressure conditions, thereby fully mixing with the inert gas and being carried out of the refrigeration system displacement unit by the inert gas. The gas and liquid mixture from the low-pressure flash tank 8 finally enters the liquid collection tank 9. The liquid collection tank 9 is used to collect possible residual liquid, ensuring that the gas medium entering the subsequent processing unit 22 is mainly gas. For example, the liquid collection tank 9 can separate the liquid from the gas as much as possible through gravity settling or other separation methods, so that the gas can continue to flow, and the separated liquid can be processed or recovered subsequently. The medium-pressure flash tank 7, the low-pressure flash tank 8, and the liquid collection tank 9 can use devices in the prior art.

[0038] By sequentially arranging the medium-pressure flash tank 7, the low-pressure flash tank 8, and the liquid collection tank 9, the volatile characteristics of substances under different pressure conditions are utilized to gradually displace the refrigerant and other substances in the refrigeration system displacement unit. This multi-stage displacement method can ensure that the residual substances in the refrigeration system are removed to the maximum extent, improving the efficiency and thoroughness of displacement. The arrangement of the medium-pressure and low-pressure flash tanks 8 can achieve gradual adjustment of the pressure in the refrigeration system, avoiding adverse effects of sudden pressure changes on the system. The presence of the liquid collection tank 9 ensures that the gas entering the subsequent processing unit 22 is relatively pure, reducing the burden on the processing unit 22 and optimizing the operation of the entire displacement system. By effectively displacing the refrigerant and other substances in the refrigeration system, the risk of accidental leakage or explosion during maintenance can be reduced. At the same time, it ensures that the residual substances in the system are properly handled, improving the safety and reliability of the entire system.

[0039] In some embodiments, the displacement system further comprises: a first valve 10 arranged on the first pipeline 2 for controlling the opening and closing of the first pipeline 2; and a second valve 11 arranged on the second pipeline 3 between the separator 6 and the medium-pressure flash tank 7 for controlling the opening and closing between the separator 6 and the medium-pressure flash tank 7.

[0040] The first valve 10 is installed on the first pipeline 2, i.e. on the pipeline between the inert gas source device and the inlet of the refrigerant synthesis tower 1. When it is needed to deliver inert gas to the refrigerant synthesis tower 1 for replacement operation, the first valve 10 is opened to allow the inert gas to flow through the first pipeline 2 into the refrigerant synthesis tower 1. When the replacement operation is completed or needs to be paused, the first valve 10 is closed to cut off the supply of inert gas and prevent the inert gas from continuously entering the synthesis tower.

[0041] The second valve 11 is located on the second pipeline 3 between the separator 6 and the medium-pressure flash tank 7. After the replacement of the synthesis system unit is completed, if it is needed to introduce inert gas into the refrigeration system unit, the second valve 11 is opened to allow the inert gas treated by the separator 6 to flow through the second pipeline 3 into the medium-pressure flash tank 7, and the replacement operation of the refrigeration system is started. When the replacement of the refrigeration system needs to be paused or stopped, the second valve 11 is closed to cut off the connection between the synthesis system unit and the refrigeration system unit, and to prevent the inert gas from flowing from the synthesis system unit to the refrigeration system unit.

[0042] The first valve 10 and the second valve 11 are arranged to allow the operator to accurately control the flow of inert gas in the replacement system. The valves can be opened or closed at any time according to actual needs, and the start, pause and stop of the replacement operation can be flexibly controlled. For example, when the synthesis system is replaced, the second valve 11 can be closed first to ensure that the inert gas only flows in the synthesis system unit, and after the replacement of the synthesis system is completed, the second valve 11 is opened to introduce the inert gas to replace the refrigeration system.

[0043] In some embodiments, the replacement system further comprises a third valve 12, which is arranged on a third pipeline that communicates with the second pipeline 3 between the second valve 11 and the medium-pressure flash tank 7, and is used to collect inert gas for measuring the content of refrigerant in the inert gas.

[0044] The third pipeline communicates with the second pipeline 3 between the second valve 11 and the medium-pressure flash tank 7. The third valve 12 is installed on the third pipeline. When it is needed to collect inert gas to measure the content of refrigerant therein, the third valve 12 is opened to allow part of the inert gas to flow from the second pipeline 3 into the third pipeline. The flow of inert gas into the third pipeline is controlled by the third valve 12. The collected inert gas is delivered to a specific detection device that can analyze the components in the inert gas to determine the content of refrigerant therein. For example, a gas chromatograph or other instrument can be used to analyze the collected inert gas to measure the concentration of refrigerant therein.

[0045] By collecting the inert gas and measuring the refrigerant content therein, the progress of the displacement process can be understood in real time. If the measurement result shows a high refrigerant content, it indicates that the displacement is not complete and needs to continue; if the refrigerant content is low, it indicates that the displacement effect is good and the displacement process can be considered to end. In this way, the displacement operation can achieve the expected effect and improve the reliability of the system. According to the measured refrigerant content data, the operating parameters of the displacement system can be adjusted, such as the flow rate, pressure, etc. of the inert gas. For example, if the refrigerant content is found to decrease slowly, the flow rate of the inert gas can be appropriately increased to improve the displacement efficiency. By monitoring the refrigerant content in the inert gas, safety hazards caused by excessive residual refrigerant during the displacement process can be avoided. For example, if the refrigerant content is too high, leakage or explosion may occur during subsequent maintenance or operation. By monitoring the refrigerant content, measures can be taken in advance to ensure the safe operation of the system.

[0046] In some embodiments, the displacement system further comprises: a fourth pipeline 13, the inlet end of the fourth pipeline 13 being in communication with the medium-pressure flash tank 7, and the outlet end of the fourth pipeline 13 being in communication with the liquid collection tank 9; a refrigeration compressor system displacement unit, the refrigeration compressor system displacement unit being arranged on the fourth pipeline 13, and part of the inert gas being able to enter the refrigeration compressor system displacement unit via the fourth pipeline 13 at the medium-pressure flash tank 7.

[0047] The inlet end of the fourth pipeline 13 is in communication with the medium-pressure flash tank 7, and the outlet end is in communication with the liquid collection tank 9. When the inert gas in the medium-pressure flash tank 7 reaches a certain pressure or meets certain conditions, part of the inert gas can flow out through the fourth pipeline 13. The refrigeration compressor system displacement unit is arranged on the fourth pipeline 13. Part of the inert gas flowing out from the medium-pressure flash tank 7 enters the refrigeration compressor system displacement unit via the fourth pipeline 13. In this unit, the inert gas performs displacement operation on the refrigeration compressor 15 system. Specifically, the inert gas expels residual refrigerant and other substances in the refrigeration compressor 15 system, achieving cleaning of the system.

[0048] The fourth pipeline 13 and the refrigeration compressor system replacement unit are added to enable the replacement system to replace more parts of the refrigeration system, including the refrigeration compressor 15 system. This ensures that the entire refrigeration system is thoroughly cleaned, improving the integrity and effectiveness of the replacement. It reduces the risk of failure caused by residual refrigerant and other substances in the refrigeration compressor 15 system, improving the stability and efficiency of the entire refrigeration system. The addition of the fourth pipeline 13 provides more flexibility for the replacement process. The flow rate and time of inert gas entering the refrigeration compressor system replacement unit can be adjusted according to actual needs to meet different replacement requirements. At the same time, the refrigeration compressor 15 system can be replaced independently without affecting the replacement operation of other parts, improving the operability of the replacement system.

[0049] In some embodiments, the refrigeration compressor system replacement unit includes a refrigerant flash tank 14 and a refrigeration compressor replacement module arranged in sequence, and part of the inert gas enters the refrigerant flash tank 14 and the refrigeration compressor replacement module in sequence.

[0050] In the medium-pressure flash tank 7, part of the inert gas enters the refrigerant flash tank 14 through the fourth pipeline 13. In the refrigerant flash tank 14, due to changes in pressure and temperature, some residual refrigerant may be further flashed out of the inert gas. For example, when the inert gas enters the refrigerant flash tank 14, the pressure decreases, causing a small amount of refrigerant originally dissolved in the inert gas to volatilize, forming a gas-liquid mixture. The gas-liquid mixture from the refrigerant flash tank 14 then enters the refrigeration compressor replacement module. In this module, the inert gas performs targeted replacement operations on the refrigeration compressor 15. Specifically, the inert gas flows through various parts of the refrigeration compressor 15, expelling residual refrigerant and other substances therein. For example, the inert gas can enter through the air inlet of the refrigeration compressor 15, then flow inside the compressor, flushing the refrigerant adhering to the compressor components and flowing out with the inert gas. The refrigerant flash tank 14 can use devices in existing technology.

[0051] By using inert gas and gradually reducing the pressure in the multi-stage flash tank, the possibility of air mixing with refrigerant can be reduced, thereby reducing the risk of explosion caused by mixed gas. The gas-liquid mixture from the refrigerant flash tank 14 then enters the refrigeration compressor replacement module. In this module, the inert gas continues to perform its role and replacement operations on the refrigeration compressor 15. In this way, the refrigerant and other substances remaining inside the refrigeration compressor 15 can be thoroughly removed.

[0052] In some embodiments, the refrigeration compressor replacement module includes a refrigeration compressor 15, which has a first section 1501, a second section 1502 and a third section 1503; it also includes a first-stage separation tank 16, a second-stage separation tank 17, a third-stage separation tank 18, a first-stage heat exchange device 19, a second-stage heat exchange device 20, and a third-stage heat exchange device 21; part of the inert gas can enter the first-stage separation tank 16, the first section 1501, the first-stage heat exchange device 19, the second-stage separation tank 17, the second section 1502, the second-stage heat exchange device 20, the third-stage separation tank 18, the third section 1503, the third-stage heat exchange device 21 and the liquid collecting tank 9 in sequence from the refrigerant flash tank 14 via the fourth pipeline 13.

[0053] After part of the inert gas leaves the refrigerant flash tank 14 from the fourth pipeline 13, it first enters the first separation tank 16. In the first separation tank 16, preliminary gas-liquid separation may be performed to separate some larger particles of liquid droplets or impurities. Then, the inert gas enters the first section 1501 of the refrigeration compressor 15. In the first section 1501, the inert gas replaces this part and discharges the residual refrigerant and other substances therein. Next, the inert gas enters the first heat exchange device 19. In the first heat exchange device 19, heat exchange may be performed to adjust the temperature of the inert gas in order to better carry out the subsequent replacement process. Afterwards, the inert gas enters the second separation tank 17, where gas-liquid separation is performed again to remove impurities such as liquid droplets that may be carried. The inert gas continues to enter the second section 1502 of the refrigeration compressor 15, where the replacement operation of the second section 1502 is performed, and then the temperature is adjusted through the second heat exchange device 20. The inert gas then enters the third-stage separation tank 18 for a third gas-liquid separation, then enters the third stage 1503 of the refrigeration compressor 15 for replacement, and then passes through the third-stage heat exchange device 21. Finally, the inert gas enters the liquid collection tank 9, completing the replacement process. The refrigeration compressor 15, the first-stage separation tank 16, the second-stage separation tank 17, the third-stage separation tank 18, the first-stage heat exchange device 19, the second-stage heat exchange device 20, and the third-stage heat exchange device 21 can all be conventional devices.

[0054] The separator is used to separate liquid droplets and impurities from the inert gas, ensuring that the inert gas entering subsequent equipment is relatively pure. Different sections of the refrigeration compressor 15 are replaced with inert gas, ensuring that residual refrigerant and other substances are removed from each section. The heat exchanger adjusts the temperature of the inert gas to ensure that the replacement operation occurs within the appropriate temperature range, improving replacement efficiency.

[0055] In some embodiments, processing unit 22 is a flare system.

[0056] In the displacement system, the processing unit 22 adopts a torch system. The inert gas with the displaced substances from the refrigeration system displacement unit, the synthetic system displacement unit, and the refrigeration compressor system displacement unit finally enters the torch system for processing. The torch system can be composed of a torch head, a torch cylinder body, an ignition device, etc. When the inert gas enters the torch system, it is discharged into the atmosphere through the torch head under certain pressure and flow. If the gas contains combustible components, the torch system will ignite them through the ignition device, allowing them to burn safely and avoiding harm to the environment and personnel.

[0057] The torch system can effectively process the inert gas containing various substances generated during the displacement process. For the combustible components that may exist, they are converted into harmless substances by burning, reducing the safety risk.

[0058] In some embodiments, the displacement system further comprises a control unit electrically connected with the first valve 10, the second valve 11, and the third valve 12, respectively, for remotely controlling the opening and closing of the first valve 10, the second valve 11, and the third valve 12; and the control unit is in communication connection with the heat exchanger 4, the first-stage heat exchange device 19, the second-stage heat exchange device 20, and the third-stage heat exchange device 21, respectively, for remotely controlling the temperature of the heat exchanger 4, the first-stage heat exchange device 19, the second-stage heat exchange device 20, and the third-stage heat exchange device 21.

[0059] The control unit is electrically connected with the first valve 10, the second valve 11, and the third valve 12, respectively. Through electrical signal transmission, the control unit can remotely send instructions to control the opening and closing of these valves. For example, when the displacement system needs to be started, the control unit can remotely open the first valve 10 to allow the inert gas to enter the refrigerant synthesis tower 1. In different displacement stages, the second valve 11 and the third valve 12 are controlled to open and close as needed to achieve precise control of gas flow direction and collection operations.

[0060] The control unit is in communication connection with the heat exchanger 4, the first-stage heat exchange device 19, the second-stage heat exchange device 20, and the third-stage heat exchange device 21, respectively. This communication connection can be achieved through wired or wireless means. The control unit can remotely send instructions to adjust the temperature of these heat exchange devices. For example, according to different displacement links and gas states, the control unit can adjust the temperature of the heat exchanger 4 to allow the inert gas to reach the appropriate temperature when entering the synthetic system displacement unit. For the heat exchange devices in each stage of the refrigeration compressor 15 system, their temperatures can also be precisely controlled according to the displacement needs of different stages of the refrigeration compressor 15 to improve displacement efficiency and quality.

[0061] The remote control function enables the operator to operate and monitor the replacement system from a location away from the site. This greatly improves the convenience of operation and reduces the exposure time of the operator in a dangerous environment. Remote control also reduces the possibility of human error and reduces the risk of safety accidents. At the same time, through remote control, the state of the valve and the heat exchange device can be quickly and accurately adjusted, improving the operation efficiency of the replacement system. Remote control can realize real-time monitoring and adjustment of the replacement system.

[0062] The replacement system provided by the embodiments of the present disclosure can effectively improve the replacement effect of the refrigerant by using the waste heat of the refrigerant synthesis tower 1 to increase the temperature of the refrigerant, and can ensure the full removal of the refrigerant in the system, thereby significantly shortening the replacement time and speeding up the preparation work before maintenance. At the same time, the heat energy recovery function maximizes the use of the heat energy of the catalyst, realizing efficient use of energy. By adopting the multi-post joint replacement mode, the handover time is further shortened, and the maintenance efficiency is improved. The replacement system supports multiple replacement modes, and can replace the synthesis system, the refrigeration system and the refrigeration compressor 15 system simultaneously or individually, meeting different needs.

[0063] The above is only a specific embodiment of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present disclosure, which should be covered within the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be subject to the protection scope of the claims.

Claims

1. A replacement system, characterized in that: include: a heat recovery unit comprising a refrigerant synthesis tower and a first pipeline, wherein the refrigerant synthesis tower is filled with a catalyst, the refrigerant synthesis tower comprises an air inlet and an air outlet, the first pipeline is connected to the air inlet, and the first pipeline is used to transport an inert gas into the refrigerant synthesis tower; a second pipeline, the second pipeline being connected to the gas outlet, and the second pipeline being provided with a synthesis system replacement unit, a refrigeration system replacement unit, and a processing unit in sequence starting from the refrigerant synthesis tower; Among them, the inert gas can enter the refrigerant synthesis tower through the first pipeline, exchange heat with the catalyst, and be discharged from the refrigerant synthesis tower through the second pipeline to enter the synthesis system replacement unit, the refrigeration system replacement unit and the processing unit in sequence.

2. The replacement system according to claim 1, characterized in that The synthetic system replacement unit includes a heat exchanger, a condenser, and a separator which are arranged in sequence. The inert gas enters the heat exchanger, the condenser, and the separator in sequence through the second pipeline.

3. The replacement system according to claim 2, characterized in that The refrigeration system replacement unit includes a medium-pressure flash tank, a low-pressure flash tank and a liquid collecting tank arranged in sequence, and the inert gas enters the medium-pressure flash tank, the low-pressure flash tank and the liquid collecting tank in sequence through the second pipeline.

4. The replacement system according to claim 3, characterized in that Also includes: a first valve, which is provided on the first pipeline and is used to control the on / off of the first pipeline; The second valve is provided on the second pipeline, located between the separator and the medium-pressure flash tank, and is used to control the on-off between the separator and the medium-pressure flash tank.

5. The replacement system according to claim 4, characterized in that Also includes: a third valve, the third valve being arranged on a third pipeline, the third pipeline being connected to the second pipeline between the second valve and the medium-pressure flash tank, the third valve being used to collect the inert gas for measuring the refrigerant content in the inert gas.

6. The replacement system according to claim 5, characterized in that Also includes: a fourth pipeline, wherein an inlet end of the fourth pipeline is connected to the medium-pressure flash tank, and an outlet end of the fourth pipeline is connected to the liquid collecting tank; A refrigeration compressor system replacement unit is provided on the fourth pipeline, and part of the inert gas can enter the refrigeration compressor system replacement unit at the medium-pressure flash tank via the fourth pipeline.

7. The replacement system according to claim 6, characterized in that The refrigeration compressor system replacement unit includes a refrigerant flash tank and a refrigeration compressor replacement module arranged in sequence, and part of the inert gas enters the refrigerant flash tank and the refrigeration compressor replacement module in sequence.

8. The replacement system according to claim 7, characterized in that The refrigeration compressor replacement module includes a refrigeration compressor having a first section, a second section, and a third section; It also includes a first-stage separation tank, a second-stage separation tank, a third-stage separation tank, a first-stage heat exchange device, a second-stage heat exchange device, and a third-stage heat exchange device; Part of the inert gas can enter the first-stage separation tank, the first section, the first-stage heat exchange device, the second-stage separation tank, the second section, the second-stage heat exchange device, the third-stage separation tank, the third section, the third-stage heat exchange device and the liquid collection tank in sequence from the refrigerant flash tank via the fourth pipeline.

9. The replacement system according to claim 8, characterized in that Also includes: a control unit, the control unit being electrically connected to the first valve, the second valve, and the third valve, respectively, and configured to remotely control the opening and closing of the first valve, the second valve, and the third valve; The control unit is respectively connected to the heat exchanger, the first stage heat exchange device, the second stage heat exchange device and the third stage heat exchange device for remotely controlling the temperature of the heat exchanger, the first stage heat exchange device, the second stage heat exchange device and the third stage heat exchange device.

10. The replacement system according to claim 1, wherein: The processing unit is a flare system.

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