A system and process flow capable of independent mechanical operation experiment

Abstract

The present invention relates to the technical field of heat pump systems, and in particular to a system and process flow capable of independent mechanical operation experiments, wherein the system comprises a tower top condenser evaporator, the tower top condenser evaporator is connected to a compressor unit through a pipeline, the compressor unit is connected to a tower bottom reboiler through a pipeline, the tower bottom reboiler is connected to a working fluid reservoir through a pipeline; the working fluid reservoir is connected to pipeline one through pipeline two, and a hot gas bypass valve is provided on pipeline two; the working fluid reservoir is connected to a working fluid cooler through pipeline three, the working fluid cooler is connected to the tower top condenser evaporator through pipeline four, and a cooler valve and a main throttle valve are provided on pipeline four, and the cooler valve is located on a side of the main throttle valve away from the tower top condenser evaporator; pipeline three and pipeline four are connected through pipeline five, and pipeline five is located between the cooler valve and the main throttle valve, and a cooler bypass valve is provided on pipeline five. The present invention can realize a mechanical operation experiment before formal start-up by adding several small-diameter pipelines and valves.

Description

Technical Field

[0001] The present invention relates to the technical field of heat pump systems, and in particular to a system and a process flow for independent mechanical operation experiments in a heat pump distillation device. Background Art

[0002] The basic process of heat pump distillation is: using Freon-like working fluid as the compressor circulation medium, evaporating in the tower top condenser evaporator and condensing in the tower bottom reboiler, recovering the condensation heat of the tower top gas, and inputting it into the tower bottom for heating after the grade is improved by the compressor unit, so as to achieve energy-saving effect.

[0003] Before the heat pump distillation unit is officially started, the compressor unit used must be subjected to a mechanical operation test on site. During the test, the temperature and pressure of each point of the compressor unit must be as close as possible to the design point of the formal operation. The traditional method is to set a dedicated bypass pipeline, water-cooled cooler and expansion tank on the compressor unit or system, disconnect the compressor unit from the distillation tower through a valve on site, and use nitrogen as the circulating working fluid to conduct the experiment.

[0004] Conventional mechanical operation experiments can only use nitrogen as a circulating working fluid because there is no process gas because the machine is not started. Nitrogen is difficult to liquefy. During the experiment, the system's original water-cooled coolers were all set in front of the main throttle valve, so that only highly superheated gas can be obtained after throttling. If the compressor inlet and outlet temperatures are to be guaranteed to meet the design values, another cooler can only be added after the main throttle valve to continue cooling. At the same time, because nitrogen is difficult to liquefy, in order to adjust the system pressure, only a large-volume container can be found as an expansion tank, such as a reboiler, liquid storage tank, etc., and an outlet pipeline and a throttle valve are added to store and release nitrogen according to the pressure. The overall system pipeline is complex, the operation volume is large, and the cost is very high. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a system and a process flow for an independent mechanical operation experiment in a heat pump distillation device.

[0006] The technical solution of the present invention to solve the above technical problems is as follows:

[0007] The first object of the present invention is to provide a system capable of independent mechanical operation experiment, comprising a distillation tower, wherein the top of the distillation tower is connected to a tower top condenser evaporator through a pipeline, the distillation tower is connected to a tower bottom reboiler through inlet and outlet pipelines respectively, the tower top condenser evaporator is connected to a reflux tank through a pipeline, and the reflux tank is connected to the top of the distillation tower through a pipeline; the tower top condenser evaporator is connected to a compressor unit through a pipeline, the compressor unit is connected to the tower bottom reboiler through a pipeline, and the tower bottom reboiler is connected to a working The working fluid reservoir is connected to the pipeline one through the pipeline two, and the pipeline two is provided with a hot gas bypass valve; the working fluid reservoir is connected to the working fluid cooler through the pipeline three, and the working fluid cooler is connected to the tower top condenser evaporator through the pipeline four, and the pipeline four is provided with a cooler valve and a main throttle valve, and the cooler valve is located on the side of the main throttle valve away from the tower top condenser evaporator; the pipeline three and the pipeline four are connected through the pipeline five, and the pipeline five is located between the cooler valve and the main throttle valve, and the pipeline five is provided with a cooler bypass valve.

[0008] By adopting the above technical scheme, compared with the pipeline equipment required for normal operation, a hot gas bypass valve and pipeline 2, as well as a cooler bypass valve and pipeline 5 are added, the added equipment pipelines are few and the cost is low; the tower top condenser evaporator is directly used as the expansion tank for the mechanical operation experiment, and there is no need to set up an additional expansion tank; the pressure of the system loop of the mechanical operation experiment is proportional to the amount of heat, and the pressure of the mechanical operation system loop can be controlled at will by adjusting the opening of the cooler valve and the cooler bypass valve; adding a hot gas bypass valve can ensure that the gas entering the compressor unit is in a slightly superheated state and will not cause liquid hammer; the present invention makes the most of the existing heat pump distillation system, adds several small-diameter pipelines and valves, and realizes the mechanical operation experiment before formal start-up, and at the same time will not have any impact on the equipment construction on the user's process side.

[0009] Furthermore, a temperature sensor is provided on the pipeline one.

[0010] Furthermore, the temperature sensor is located between the tower top condenser evaporator and pipeline two.

[0011] By adopting the above technical solution, in order to prevent the gas at the compressor unit inlet from carrying liquid and causing liquid hammer, it is convenient to observe the temperature at the compressor unit inlet through a temperature sensor.

[0012] Furthermore, a pressure sensor is provided on the pipeline one.

[0013] Furthermore, the pressure sensor is located between the tower top condenser evaporator and pipeline two.

[0014] By adopting the above technical solution, in order to prevent the gas at the compressor unit inlet from carrying liquid and causing liquid hammer, it is convenient to observe the pressure at the compressor unit inlet through a pressure sensor.

[0015] The second object of the present invention is to provide a process flow for an independent mechanical operation experiment, using the system for an independent mechanical operation experiment as described above, comprising the following steps:

[0016] Add Freon working fluid to the tower top condenser evaporator. The working mass is calculated according to the pressure to be tested and the volume of the system pipeline, and the tower top condenser evaporator can be filled to a liquid level greater than 1 / 3; the hot gas bypass valve is fully opened, the working fluid cooler is passed with water, the cooler valve is closed, the cooler bypass valve is opened, and the main throttle valve is opened by 20~50%;

[0017] The compressor unit is turned on, and the load is increased to 10-30%. After being compressed by the compressor unit, the Freon working medium passes through the tower kettle reboiler, the Freon working medium liquid reservoir, the cooler bypass valve, the main throttle valve, the tower top condenser evaporator in sequence, and then returns to the compressor unit; a small part of the working medium enters the Freon working medium liquid reservoir and directly returns to the compressor unit through the hot gas bypass valve; the working medium is pressurized by the compressor unit and becomes a high-temperature and high-pressure gas, which is throttled and reduced in pressure by the main throttle valve to become a high-temperature and low-pressure superheated gas. After entering the liquid working medium of the tower top condenser evaporator, part of the liquid is evaporated using the heat of the high-temperature superheated gas;

[0018] Through the above cycle, the liquid working fluid in the tower top condenser evaporator is continuously transformed into gaseous working fluid, and the pressure in the system loop is continuously rising; in the process, the load position is gradually and slowly increased to 50~65% and the main throttle valve is opened; when the exhaust pressure of the compressor unit rises to 65~80% of the maximum target pressure, the cooler valve is opened and the cooler bypass valve is closed; at this time, part of the high-temperature and high-pressure gas enters the working fluid cooler for cooling and liquefaction, and mixes with the high-temperature and high-pressure gas from another route that has not entered the working fluid cooler, and becomes a low-temperature and low-pressure gas after passing through the main throttle valve; continue to increase the load position to 100%, the pressure reaches the maximum target pressure, and then stably runs for the specified time, and the mechanical operation experiment is completed.

[0019] By adopting the above technical solution, in the mechanical operation experiment, the work done by the main motor power is the heat input of the system circuit, and the working fluid cooler is the heat output of the system circuit.

[0020] Furthermore, the process flow of the independent mechanical operation experiment also includes the following steps: after the mechanical operation experiment is completed, the valves are not moved first, the load of the compressor unit is reduced to the minimum, and the system loop pressure is reduced to a level that no longer decreases, and then the unit is shut down. At the same time, the main throttle valve is closed, and then the water supply to the working fluid cooler is cut off.

[0021] Furthermore, during the adjustment period, if the system pressure is too high or rises too quickly, the amount of gas entering the working fluid cooler can be increased by opening the cooler valve and closing the cooler bypass valve, which is equivalent to more heat in the system loop being taken away by the circulating cooling water, more gas becoming liquid, and occupying less pipeline volume, so that the system pressure rise is slowed down or even decreased; if the pressure is low or continues to decrease, the amount of gas entering the working fluid cooler can be reduced by closing the cooler valve and opening the cooler bypass valve, which is equivalent to less heat in the system loop being taken away by the circulating cooling water, less gas becoming liquid, and occupying a large pipeline volume, so that the system pressure rise is accelerated.

[0022] Furthermore, during the adjustment period, in order to prevent liquid hammer caused by liquid in the gas at the compressor unit inlet, observe the temperature and pressure at the compressor unit inlet. If the temperature is lower than the saturation temperature of the working fluid corresponding to the pressure, open the hot gas bypass valve and close the main throttle valve to allow more high-temperature gas to mix into the intake air; if the temperature is more than 10°C higher than the saturation temperature of the working fluid corresponding to the pressure, close the hot gas bypass valve and open the main throttle valve to allow less high-temperature gas to mix into the intake air.

[0023] In summary, compared with the prior art, the above technical solution has the following beneficial effects:

[0024] (1) Compared with the pipeline equipment required for normal operation, the present invention adds a hot gas bypass valve and pipeline 2, as well as a cooler bypass valve and pipeline 5, which increases the number of equipment pipelines and has low cost. Among them, the diameter of the hot gas bypass valve and pipeline 2 can be 1 / 4 of that of pipeline 1, and the diameter of the cooler bypass valve and pipeline 5 is based on the diameter of the cooler valve;

[0025] (2) The present invention directly uses the tower top condenser evaporator as the expansion tank for the mechanical operation experiment, and there is no need to set up an additional expansion tank. The mechanical operation experiment requires an expansion tank to store the working fluid to adjust the pressure of the system loop, and the expansion tank requires a pipeline for the liquid working fluid to be discharged and recovered; the tower top condenser evaporator is a full liquid evaporator. This type of evaporator has a bottom-in and top-out structure. The high-temperature gas enters from the bottom, is washed by the liquid stored inside, evaporates and carries out part of the liquid, and the gas is just saturated at the outlet; as long as the gas at the bottom inlet is superheated gas, the liquid stored in the evaporator can be evaporated and taken away without adding a discharge pipeline; as long as the gas at the bottom inlet is a saturated gas containing liquid droplets, the liquid droplets can be left in the evaporator without adding a recovery pipeline;

[0026] (3) In the present invention, the pressure of the system loop of the mechanical operation experiment is proportional to the amount of heat. By adjusting the opening of the cooler valve and the cooler bypass valve, the pressure of the mechanical operation system loop can be arbitrarily controlled; when the system pressure needs to be increased, the cooler valve is closed, the cooler bypass valve is opened, and the gas flow through the working fluid cooler is reduced, thereby reducing the heat taken away; when the system pressure needs to be reduced, the cooler valve is opened, the cooler bypass valve is closed, and the gas flow through the working fluid cooler is increased, thereby increasing the heat taken away;

[0027] (4) The hot gas bypass valve added in the present invention can ensure that the gas entering the compressor unit is in a slightly superheated state and will not cause liquid hammer;

[0028] (5) The mechanical operation test system of the present invention is directly built on the normal operating system. During the test, all equipment operations including the compressor unit and system pipelines, pipeline cleanliness, on-site cooling water, instrument air, and control logic of automatic valve instruments can be tested. Because the same pipeline is used as in the future formal operation, the pipeline pressure drop can be directly introduced to adjust the inlet and outlet pressures of the compressor unit, so that the top condenser evaporator and the tower kettle reboiler that affect the process in the tower can truly operate at the design point.

[0029] (6) The mechanical operation experimental process of the present invention is completely separated from the distillation process side and does not affect each other. Even if the facilities in the distillation tower are still under construction, the experiment will not affect the construction of personnel;

[0030] (7) The system of the present invention is directly tested on site, using only the original circulating fluid, and can adjust the operating conditions according to actual conditions;

[0031] (8) In the distillation process, flammable and explosive media are very common. For safety reasons, the media will not be allowed to be stored in the equipment for a long time, so the time between feeding and starting is very short. Once the distillation tower is fed, the equipment area will be designated as a production area. Any personnel entry and exit and construction fire must face a complicated application process, which greatly increases the time cost and expenses. The present invention can conduct experiments before feeding the distillation tower, which can leave enough time to deal with the exposed problems and will not delay the official start-up. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0033] Explanation of the reference numerals in the drawings: 1. Top condenser evaporator; 2. Bottom reboiler; 3. Hot gas bypass valve; 4. Working fluid liquid storage tank; 5. Compressor unit; 6. Working fluid cooler; 7. Cooler valve; 8. Cooler bypass valve; 9. Main throttle valve; 10. Temperature sensor; 11. Pressure sensor; 12. Distillation tower; 13. Reflux tank; 100. Pipeline one; 200. Pipeline two; 300. Pipeline three; 400. Pipeline four; 500. Pipeline five. DETAILED DESCRIPTION

[0034] The following is combined with Figure 1 The principles and features of the present invention are described, and the examples given are only used to explain the present invention, rather than to limit the scope of the present invention.

[0035] The embodiment of the present invention discloses a system capable of independently performing mechanical operation experiments.

[0036] Reference Figure 1 A system capable of independent mechanical operation experiment comprises a distillation tower 12, the top of the distillation tower 12 is connected to a tower top condenser evaporator 1 through a pipeline, the distillation tower 12 is connected to a tower bottom reboiler 2 through inlet and outlet pipelines respectively, the tower top condenser evaporator 1 is connected to a reflux tank 13 through a pipeline, and the reflux tank 13 is connected to the top of the distillation tower 12 through a pipeline.

[0037] Distillation feed 1 and distillation feed 2 are alkane liquids of different components. After entering the distillation tower 12, they fall and mix, and transfer mass and heat with the rising hot gas in the bottom of the distillation tower 12. The light component in the liquid is first vaporized and then rises with the rising gas until it is extracted from the top of the distillation tower 12. The component with medium specific gravity is extracted at the middle height of the distillation tower 12, and the heavy component is not vaporized at all and continues to fall to the bottom of the distillation tower 12 before being extracted.

[0038] The tower top condenser evaporator 1 is connected to a compressor unit 5 through a pipeline 100, and the compressor unit 5 is connected to a tower bottom reboiler 2 through a pipeline, and the tower bottom reboiler 2 is connected to a working fluid reservoir 4 through a pipeline. The working fluid reservoir 4 is connected to the pipeline 100 through a pipeline 200, and a hot gas bypass valve 3 is installed on the pipeline 200.

[0039] In order to prevent liquid hammer caused by liquid in the inlet gas of the compressor unit 5, a temperature sensor 10 is installed on the pipeline 100, and the temperature sensor 10 is located between the top condenser evaporator 1 and the pipeline 2 200, so that the temperature of the inlet of the compressor unit 5 can be observed through the temperature sensor 10; a pressure sensor 11 is installed on the pipeline 100, and the pressure sensor 11 is located between the top condenser evaporator 1 and the pipeline 2 200, so that the pressure of the inlet of the compressor unit 5 can be observed through the pressure sensor 11.

[0040] The working fluid liquid storage tank 4 is connected to the working fluid cooler 6 via pipeline three 300, and the working fluid cooler 6 is connected to the tower top condenser evaporator 1 via pipeline four 400, and the pipeline four 400 is provided with a cooler valve 7 and a main throttle valve 9, and the cooler valve 7 is located on the side of the main throttle valve 9 away from the tower top condenser evaporator 1; the pipeline three 300 and the pipeline four 400 are connected via pipeline five 500, and the pipeline five 500 is located between the cooler valve 7 and the main throttle valve 9, and the pipeline five 500 is provided with a cooler bypass valve 8.

[0041] Compared with the pipeline equipment required for normal operation, the present invention adds a hot gas bypass valve 3 and a pipeline 200, as well as a cooler bypass valve 8 and a pipeline 500, with fewer added equipment pipelines and low cost; the tower top condenser evaporator 1 is directly used as an expansion tank for the mechanical operation experiment, and there is no need to set up an additional expansion tank; the pressure of the system loop of the mechanical operation experiment is proportional to the amount of heat, and the pressure of the mechanical operation system loop can be controlled at will by adjusting the opening of the cooler valve 7 and the cooler bypass valve 8; adding the hot gas bypass valve 3 can ensure that the gas entering the compressor unit 5 is in a slightly superheated state and will not cause liquid hammer.

[0042] The embodiment of the present invention also discloses a process flow capable of conducting an independent mechanical operation experiment.

[0043] Reference Figure 1 A process flow of an independent mechanical operation experiment using the system for independent mechanical operation experiment as described above includes the following steps:

[0044] Add Freon working medium to the tower top condenser evaporator 1. The working mass is calculated according to the pressure to be tested and the volume of the system pipeline, and the tower top condenser evaporator 1 can be filled to a liquid level greater than 1 / 3; the hot gas bypass valve 3 is fully opened, the working medium cooler 6 is passed with water, the cooler valve 7 is closed, the cooler bypass valve 8 is opened, and the main throttle valve 9 is opened by 20-50%, specifically 30%;

[0045] The compressor unit 5 is started, and the load is increased to 10-30%, specifically 20%. After being compressed by the compressor unit 5, the Freon working medium passes through the tower bottom reboiler 2, the Freon working medium liquid reservoir 4, the cooler bypass valve 8, the main throttle valve 9, the tower top condenser evaporator 1 in sequence, and then returns to the compressor unit 5; after a small part of the working medium enters the Freon working medium liquid reservoir 4, it directly returns to the compressor unit 5 through the hot gas bypass valve 3; the working medium is pressurized by the compressor unit 5 and becomes a high-temperature and high-pressure gas, and after being throttled and reduced in pressure by the main throttle valve 9, it becomes a high-temperature and low-pressure superheated gas. After entering the liquid working medium of the tower top condenser evaporator 1, part of the liquid is evaporated by the heat of the high-temperature superheated gas;

[0046] Through the above cycle, the liquid working medium in the tower top condenser evaporator 1 is continuously transformed into gaseous working medium, and the pressure in the system loop is continuously rising; in the process, the load position is gradually and slowly increased to 50-65%, specifically 60%, and the main throttle valve 9 is opened; when the exhaust pressure of the compressor unit 5 rises to 65-80%, specifically 70% of the maximum target pressure, the cooler valve 7 is opened and the cooler bypass valve 8 is closed; at this time, part of the high-temperature and high-pressure gas enters the working medium cooler 6 for cooling and liquefaction, and mixes with the other high-temperature and high-pressure gas that has not entered the working medium cooler 6, and becomes a low-temperature and low-pressure gas after passing through the main throttle valve 9; continue to increase the load position to 100%, the pressure reaches the maximum target pressure, and then stably runs to the specified time, and the mechanical operation experiment is completed.

[0047] The process flow of the independent mechanical operation experiment also includes the following steps: after the mechanical operation experiment is completed, the valves are not moved first, the load of the compressor unit 5 is reduced to the minimum, and the system loop pressure is reduced to a level that no longer decreases, and then the machine is shut down. At the same time, the main throttle valve 9 is closed, and then the water supply to the working fluid cooler 6 is cut off.

[0048] In the mechanical operation experiment, the work done by the main motor power is the heat input of the system loop, and the working fluid cooler 6 is the heat output of the system loop. During the adjustment period, if the system pressure is too high or rises too fast, by opening the cooler valve 7 and closing the cooler bypass valve 8, the amount of gas entering the working fluid cooler 6 is increased, which is equivalent to more heat in the system loop being taken away by the circulating cooling water, more gas becomes liquid, and occupies less pipeline volume, so that the system pressure rise is slowed down or even decreased; if the pressure is low or continues to drop, by closing the cooler valve 7 and opening the cooler bypass valve 8, the amount of gas entering the working fluid cooler 6 is reduced, which is equivalent to less heat in the system loop being taken away by the circulating cooling water, less gas becomes liquid, and occupies a large pipeline volume, so that the system pressure rise is accelerated.

[0049] During the adjustment period, in order to prevent liquid hammer caused by liquid in the gas at the inlet of the compressor unit 5, observe the temperature and pressure at the inlet of the compressor unit 5. If the temperature is lower than the saturation temperature of the working fluid corresponding to the pressure, open the hot gas bypass valve 3 and close the main throttle valve 9 to allow more high-temperature gas to mix into the intake air; if the temperature is more than 10°C higher than the saturation temperature of the working fluid corresponding to the pressure, close the hot gas bypass valve 3 and open the main throttle valve 9 to allow less high-temperature gas to mix into the intake air.

[0050] The mechanical operation experimental process of the present invention is completely separated from the distillation process side and does not affect each other. Even if the facilities in the distillation tower 12 are still under construction, the experiment does not affect the construction of personnel. The system of the present invention conducts experiments directly on site, only uses the original circulating working fluid, and can adjust the operating conditions according to actual conditions.

[0051] For example:

[0052] A refinery light hydrocarbon separation tower heat pump distillation project added a DN250 cooler bypass valve pipeline on site, including DN250 stop valve cooler bypass valve 8 1, length 11 meters; DN100 hot gas bypass valve pipeline, including DN100 stop valve hot gas bypass valve 3 1, length 19 meters;

[0053] The actual operating exhaust pressure of compressor unit 5 is 20.2 barG, which is 0.6 barG higher than the original design value. Two heat pump compressor units 5 are connected in parallel in the system. The pipeline from compressor unit 5 to the tower kettle reboiler 2 is more than 80 meters long and 32 meters high. The pipeline is first collected and then separated.

[0054] The mechanical operation experiment was completed one month before the official start-up. At the same time, the remote automatic control system of the user control center was tested, including the automatic start and shutdown logic of the compressor unit 5, the interlocking of the liquid level height of the system heat exchanger and the main throttle valve 9, the interlocking of various alarm points, the alarm automatic emergency shutdown interlocking, the automatic switching interlocking of the standby oil pump in case of an emergency, etc., and the problems found were rectified; the subsequent feeding of the distillation tower 12 and the official start-up were successfully completed within 4 days.

[0055] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A system capable of independent mechanical operation experiments, comprising a distillation tower (12), characterized in that: The top of the distillation tower (12) is connected to a top condenser evaporator (1) via a pipeline; the distillation tower (12) is connected to a bottom reboiler (2) via inlet and outlet pipelines respectively; the top condenser evaporator (1) is connected to a reflux tank (13) via a pipeline; the reflux tank (13) is connected to the top of the distillation tower (12) via a pipeline; the top condenser evaporator (1) is connected to a compressor unit (5) via a pipeline 1 (100); the compressor unit (5) is connected to the bottom reboiler (2) via a pipeline; the bottom reboiler (2) is connected to a working fluid liquid reservoir (4) via a pipeline; the working fluid liquid reservoir (4) is connected to the pipeline 1 (100) via a pipeline 2 (200); the pipeline 2 (200) is connected to the pipeline 1 (1 ... working fluid liquid reservoir (4); the working fluid liquid reservoir (4) is connected to the pipeline 1 (100) via a pipeline 2 (200); the pipeline 2 (200) is connected to the pipeline 1 (100); the pipeline 2 (200) is connected to the working fluid liquid reservoir (4); the working fluid liquid reservoir (4 A hot gas bypass valve (3) is provided on the second pipeline (200); the working fluid storage device (4) is connected to a working fluid cooler (6) via a third pipeline (300); the working fluid cooler (6) is connected to a tower top condenser evaporator (1) via a fourth pipeline (400); a cooler valve (7) and a main throttle valve (9) are provided on the fourth pipeline (400); the cooler valve (7) is located on a side of the main throttle valve (9) away from the tower top condenser evaporator (1); the third pipeline (300) and the fourth pipeline (400) are connected via a fifth pipeline (500); the fifth pipeline (500) is located between the cooler valve (7) and the main throttle valve (9); the fifth pipeline (500) is provided with a cooler bypass valve (8).

2. The system capable of independent mechanical operation experiment according to claim 1, characterized in that: The pipeline one (100) is provided with a temperature sensor (10).

3. The system capable of independent mechanical operation experiment according to claim 2, characterized in that: The temperature sensor (10) is located between the tower top condenser evaporator (1) and pipeline 2 (200).

4. The system capable of independent mechanical operation experiment according to any one of claims 1 to 3, characterized in that: The pipeline one (100) is provided with a pressure sensor (11).

5. The system capable of independent mechanical operation experiment according to claim 4, characterized in that: The pressure sensor (11) is located between the tower top condenser evaporator (1) and pipeline 2 (200).

6. A process flow capable of independent mechanical operation experiment, characterized in that: The system for independent mechanical operation experiment as claimed in any one of claims 1 to 5 comprises the following steps: The freon working medium is added to the tower top condenser evaporator (1). The working mass is calculated according to the pressure to be tested and the volume of the system pipeline, and the tower top condenser evaporator (1) can be filled to a liquid level greater than 1 / 3; the hot gas bypass valve (3) is fully opened, the working medium cooler (6) is passed with water, the cooler valve (7) is closed, the cooler bypass valve (8) is opened, and the main throttle valve (9) is opened by 20-50%; The compressor unit (5) is started, and the load is increased to 10-30%. After being compressed by the compressor unit (5), the freon working medium passes through the tower bottom reboiler (2), the freon working medium liquid storage tank (4), the cooler bypass valve (8), the main throttle valve (9), the tower top condenser evaporator (1), and then returns to the compressor unit (5). A small amount of the working medium enters the freon working medium liquid storage tank (4) and then directly returns to the compressor unit (5) through the hot gas bypass valve (3). Through the above cycle, the liquid working medium in the tower top condenser evaporator (1) is continuously converted into gaseous working medium, and the pressure in the system loop is continuously increased; during the process, the load position is gradually increased to 50-65% and the main throttle valve (9) is opened; when the exhaust pressure of the compressor unit (5) increases to 65-80% of the maximum target pressure, the cooler valve (7) is opened and the cooler bypass valve (8) is closed; at this time, part of the high-temperature and high-pressure gas enters the working medium cooler (6) for cooling and liquefaction, and is mixed with the high-temperature and high-pressure gas of another route that has not entered the working medium cooler (6), and becomes low-temperature and low-pressure gas after passing through the main throttle valve (9); the load position is continuously increased to 100%, the pressure reaches the maximum target pressure, and then the machine is operated stably for a specified time, and the mechanical operation experiment is completed.

7. The process flow of the independent mechanical operation experiment according to claim 6 is characterized in that: The following steps are also included: after the mechanical operation experiment is completed, the valves are not moved first, the load position of the compressor unit (5) is reduced to the minimum, and the system loop pressure is reduced to a level that no longer decreases, and then the machine is shut down. At the same time, the main throttle valve (9) is closed, and then the water supply to the working fluid cooler (6) is cut off.

8. The process flow of the independent mechanical operation experiment according to claim 6 is characterized in that: During the adjustment period, the amount of gas entering the working fluid cooler (6) is increased by opening the cooler valve (7) and closing the cooler bypass valve (8), so that the rise in system pressure is slowed down or even reduced; the amount of gas entering the working fluid cooler (6) is reduced by closing the cooler valve (7) and opening the cooler bypass valve (8), so that the rise in system pressure is accelerated.

9. The process flow of the independent mechanical operation experiment according to claim 6 is characterized in that: During the adjustment period, the temperature and pressure at the inlet of the compressor unit (5) are observed. If the temperature is lower than the saturation temperature of the working fluid corresponding to the pressure, the hot gas bypass valve (3) is opened and the main throttle valve (9) is closed to allow more high-temperature gas to mix into the intake air.

10. The process flow of the independent mechanical operation experiment according to claim 9 is characterized in that: If the temperature is higher than the saturation temperature of the working fluid corresponding to the pressure by more than 10°C, the hot gas bypass valve (3) is closed and the main throttle valve (9) is opened to allow less high-temperature gas to mix into the intake air.

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