Comprehensive performance evaluation system for pressure coupling device

Abstract

The invention belongs to the technical field of mine cooling, and discloses a comprehensive performance evaluation system for a pressure coupling device, a high-pressure loop and a low-pressure loop are constructed around the to-be-evaluated pressure coupling device, the circulation process of a high-pressure process fluid and the circulation process of a low-pressure process fluid are realized, and the pressure and temperature of the two loops can be independently adjusted. The operation condition in an actual mine cooling system is met, and ground simulation of the real environment of the deep mine is achieved; besides, two auxiliary fluids of a heat source required by a heat exchanger in a low-pressure loop and a cold source required by a condenser in a refrigerating unit are combined into one, an auxiliary loop is ingeniously constructed between the heat exchanger and the condenser, and an air cooling tower is arranged to timely discharge a small amount of heat additionally accumulated in the whole system. Efficient energy utilization in the comprehensive performance evaluation system of the pressure coupling device is realized, the operation energy consumption of the evaluation system is effectively reduced, and a considerable energy-saving effect is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of mine cooling, and in particular relates to a comprehensive performance evaluation system for a pressure coupling device. Background Art

[0002] As the depth of coal mining continues to increase, the problem of heat damage in mines has become more and more serious. As a mainstream heat damage prevention and control technology, the ground centralized refrigeration and cooling system has the advantages of convenient condensation heat discharge, high refrigeration and cooling efficiency, and simple and reliable equipment. It is widely used in the mining of large deep coal mines. The system involves fluids of different pressures and temperatures, and needs to complete the pressure conversion process of converting high-pressure cold water (generally about 3°C) into low-pressure cold water, and low-pressure hot water (generally about 18°C) into high-pressure hot water. The pressure coupling device can meet the pressure conversion requirements of the above-mentioned high and low pressure fluids, and is one of the core equipment in the ground centralized refrigeration and cooling system.

[0003] Before being put into actual engineering application in coal mines, the developed pressure coupling device needs to be evaluated for all fluid dynamics parameters, including flow, pressure, and temperature, to examine and evaluate the device's overall performance. Therefore, it is essential to construct a comprehensive performance evaluation system for pressure coupling devices on the ground to evaluate the comprehensive performance of the pressure coupling device. Among them, how to simulate the pressure, temperature, and other working conditions of the real mine environment while fully considering its own energy conservation and consumption reduction is the core issue in building this evaluation system. Summary of the Invention

[0004] Based on the goal of effectively evaluating parameters such as flow, pressure and temperature of the pressure coupling device on the ground, the present invention constructs a comprehensive performance evaluation system for the pressure coupling device, and fully considers the needs of energy saving and consumption reduction of the system.

[0005] In order to achieve the above-mentioned object of the invention, the present invention is implemented through the following technical solutions:

[0006] The present invention provides a comprehensive performance evaluation system for a pressure coupling device, wherein the pressure coupling device used for evaluation includes a high-pressure cold water inlet, a low-pressure cold water outlet, a low-pressure hot water inlet, and a high-pressure hot water outlet; and comprises:

[0007] A refrigeration unit using a refrigerant cycle, comprising a compressor, a condenser, an expansion valve, and an evaporator; the outlet of the compressor is connected to the refrigerant inlet of the condenser, the refrigerant outlet of the condenser is connected to the inlet of the expansion valve, the outlet of the expansion valve is connected to the refrigerant inlet of the evaporator, and the refrigerant outlet of the evaporator is connected to the inlet of the compressor;

[0008] The high-pressure hot water outlet of the pressure coupling device is connected to the process fluid inlet of the evaporator, and the process fluid outlet of the evaporator is connected to the high-pressure cold water inlet of the pressure coupling device through a high-pressure circulation pump; the low-pressure cold water outlet of the pressure coupling device is connected to the process fluid inlet of the heat exchanger, and the process fluid outlet of the heat exchanger is connected to the low-pressure hot water inlet of the pressure coupling device through a low-pressure circulation pump;

[0009] A high-pressure branch is provided between the evaporator and the high-pressure circulation pump, the high-pressure branch including a first water tank and a first pressure pump; a high-pressure stabilizing valve is provided between the first pressure pump and the high-pressure circulation pump;

[0010] A low-pressure branch is set between the low-pressure cold water outlet of the pressure coupling device and the heat exchanger, and the low-pressure branch includes a second water tank and a second boosting pump; a low-pressure stabilizing valve is set between the second boosting pump and the heat exchanger.

[0011] Furthermore, the auxiliary fluid outlet of the heat exchanger is connected to the auxiliary fluid inlet of the condenser through the auxiliary circulation pump, and the auxiliary fluid outlet of the condenser is connected to the auxiliary fluid inlet of the heat exchanger through the air cooling tower.

[0012] Furthermore, the inlet of the first booster pump is connected to the first water tank, and the outlet of the first booster pump is connected to the connecting pipeline between the evaporator and the high-pressure circulation pump.

[0013] Furthermore, a high-pressure accumulator is provided on the connecting pipeline between the high-pressure pressure stabilizing valve and the high-pressure circulation pump.

[0014] Furthermore, the inlet of the second booster pump is connected to the second water tank, and the outlet of the second booster pump is connected to the connecting pipeline between the low-pressure cold water outlet of the pressure coupling device and the heat exchanger.

[0015] Furthermore, a low-pressure accumulator is provided on the connecting pipeline between the low-pressure stabilizing valve and the heat exchanger.

[0016] Further, it is used to monitor: the pressure P at the high pressure cold water inlet hi , temperature T hi and flow Q hi ; The pressure P at the low-pressure cold water outlet lo , temperature T lo and flow Q lo ; The pressure P at the low-pressure hot water inlet li , temperature T li and flow Q li The pressure P at the high-pressure hot water outlet ho , temperature T ho and flow Qho ; Thus, the high pressure resistance loss ΔP of the pressure coupling device is obtained h and low pressure resistance loss ΔP l , Maximum temperature rise of cold water outlet T r , internal leakage ΔQ h and the device theoretical efficiency η.

[0017] The beneficial effects of the present invention are:

[0018] (1) The comprehensive performance evaluation system for a pressure coupling device of the present invention constructs a high-pressure circuit and a low-pressure circuit around the pressure coupling device to be evaluated, realizing the circulation process of the high-pressure process fluid and the circulation process of the low-pressure process fluid. The pressure and temperature of the two circuits can be adjusted independently, which conforms to the operating conditions of the actual mine cooling system and realizes the ground simulation of the real environment of deep mines.

[0019] (2) The comprehensive performance evaluation system of the pressure coupling device of the present invention combines the two auxiliary fluids, namely the heat source required by the heat exchanger in the low-pressure circuit and the cold source required by the condenser in the refrigeration unit, into one, cleverly constructs an auxiliary circuit between the heat exchanger and the condenser, and provides an air-cooling tower to promptly discharge the small amount of extra heat accumulated in the entire system, thereby achieving efficient energy utilization within the comprehensive performance evaluation system of the pressure coupling device, effectively reducing the operating energy consumption of the evaluation system, and having considerable energy-saving effects.

[0020] (3) The comprehensive performance evaluation system for the pressure coupling device of the present invention can experimentally evaluate the full-factor fluid mechanics parameters of the pressure coupling device, such as pressure, temperature and flow. By calculating and processing these operating data, the main performance indicators of the pressure coupling device can be obtained, especially key data such as the device's flow resistance loss, cold water outlet temperature rise, leakage volume and the device's theoretical efficiency, which has a high reference value for practical engineering applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a flow chart of a comprehensive performance evaluation system for a pressure coupling device provided by an embodiment of the present invention.

[0022] In the above figure: 1- compressor; 2- condenser; 3- expansion valve; 4- evaporator; 5- first water tank; 6- first booster pump; 7- high-pressure stabilizing valve; 8- high-pressure accumulator; 9- high-pressure circulating pump; 10- pressure coupling device; 101- high-pressure cold water inlet; 102- low-pressure cold water outlet; 103- low-pressure hot water inlet; 104- high-pressure hot water outlet; 11- second water tank; 12- second booster pump; 13- low-pressure stabilizing valve; 14- low-pressure accumulator; 15- heat exchanger; 16- low-pressure circulating pump; 17- air cooling tower; 18- auxiliary circulating pump. DETAILED DESCRIPTION

[0023] In order to further understand the content, features and effects of the present invention, the following embodiments are given as examples and described in detail with reference to the accompanying drawings:

[0024] like Figure 1 As shown, the comprehensive performance evaluation system for the pressure coupling device provided in this embodiment is composed of a refrigeration unit, a heat exchanger, a circulation pump, a booster pump, etc.

[0025] The pressure coupling device 10 to be evaluated is generally provided with four external interfaces, namely a high-pressure cold water inlet 101 , a low-pressure cold water outlet 102 , a low-pressure hot water inlet 103 and a high-pressure hot water outlet 104 .

[0026] The refrigeration unit mainly includes a compressor 1, a condenser 2, an expansion valve 3, and an evaporator 4, and uses a refrigerant cycle. The condenser 2 is equipped with a refrigerant inlet and outlet, as well as an auxiliary fluid inlet and outlet, while the evaporator 4 is equipped with a refrigerant inlet and outlet, as well as a process fluid inlet and outlet.

[0027] The outlet of the compressor 1 is connected to the refrigerant inlet of the condenser 2 , the refrigerant outlet of the condenser 2 is connected to the inlet of the expansion valve 3 , the outlet of the expansion valve 3 is connected to the refrigerant inlet of the evaporator 4 , and the refrigerant outlet of the evaporator 4 is connected to the inlet of the compressor 1 .

[0028] Compressor 1 compresses low-temperature, low-pressure refrigerant vapor into high-temperature, high-pressure gas by consuming mechanical energy, and transports it to condenser 2; in condenser 2, high-temperature, high-pressure gaseous refrigerant is condensed into medium-temperature, high-pressure liquid by heat dissipation, and flows to expansion valve 3; expansion valve 3 throttles and reduces pressure, and the high-pressure liquid refrigerant is converted into a low-temperature, low-pressure gas-liquid two-phase mixture, which flows to evaporator 4; in evaporator 4, the liquid refrigerant evaporates at low pressure, absorbs heat, cools the surrounding medium, and is converted into low-temperature, low-pressure steam, which then flows into compressor 1, and the above processes are circulated.

[0029] The high-pressure hot water outlet 104 of the pressure coupling device 10 is connected to the process fluid inlet of the evaporator 4. The process fluid outlet of the evaporator 4 is connected to the high-pressure cold water inlet 101 of the pressure coupling device 10 via the high-pressure circulation pump 9. The heat exchanger 15 is equipped with a process fluid inlet and outlet as well as an auxiliary fluid inlet and outlet. The low-pressure cold water outlet 102 of the pressure coupling device 10 is connected to the process fluid inlet of the heat exchanger 15. The process fluid outlet of the heat exchanger 15 is connected to the low-pressure hot water inlet 103 of the pressure coupling device 10 via the low-pressure circulation pump 16.

[0030] The evaporator 4 in the refrigeration unit receives the high-pressure hot water outlet 104 (the fluid pressure at this location is denoted as P) from the pressure coupling device 10. ho , temperature is recorded as T ho , the flow is recorded as Q ho) is cooled to high-pressure cold water, which is then delivered to the high-pressure cold water inlet 101 of the pressure coupling device 10 (the fluid pressure there is denoted as P hi , temperature is recorded as T hi , the flow is recorded as Q hi ), and then flows into the pressure coupling device 10 for the boost stroke, and then flows out from the high-pressure hot water outlet 104 of the pressure coupling device 10, completing the circulation process of the high-pressure process fluid, thereby forming a high-pressure circuit. The low-pressure cold water outlet 102 of the pressure coupling device 10 (the fluid pressure there is recorded as P lo , temperature is recorded as T lo , the flow is recorded as Q lo ) flows into the process fluid inlet of the heat exchanger 15, is heated to low-pressure hot water through heat exchange, and is then transported to the low-pressure hot water inlet 103 of the pressure coupling device 10 through the low-pressure circulation pump 16 (the fluid pressure at this location is recorded as P li , temperature is recorded as T li , the flow is recorded as Q li ), and then flows into the pressure coupling device 10 for a pressure relief stroke, and then flows out from the low-pressure cold water outlet 102 of the pressure coupling device 10, realizing the circulation process of the low-pressure process fluid, thereby forming a low-pressure circuit.

[0031] The above-mentioned high-pressure circuit and low-pressure circuit constructed by the comprehensive performance evaluation system of the pressure coupling device realize the circulation process of high-pressure process fluid and the circulation process of low-pressure process fluid, and can experimentally evaluate the boost stroke and pressure relief stroke performed simultaneously by the pressure coupling device 10, which is in line with the actual operating conditions in the mine cooling system and realizes the ground simulation of the real environment of the mine.

[0032] A high-pressure branch is provided on the connecting pipeline between the process fluid outlet of the evaporator 4 and the inlet of the high-pressure circulating pump 9. The high-pressure branch is used to provide high pressure to the high-pressure circuit and is composed of a first water tank 5 and a first booster pump 6. The inlet of the first booster pump 6 is connected to the first water tank 5, and the outlet of the first booster pump 6 is connected to the connecting pipeline between the evaporator 4 and the high-pressure circulating pump 9.

[0033] The connecting pipeline between the outlet of the first booster pump 6 and the high-pressure circulation pump 9 is connected to the inlet of the high-pressure stabilizing valve 7, and the outlet of the high-pressure stabilizing valve 7 is vented. The high-pressure stabilizing valve 7 is used to release pressure in time to prevent the high-pressure circuit pressure from continuing to rise, thereby maintaining the pressure stable.

[0034] As a preferred embodiment, a high-pressure accumulator 8 is provided on the connecting pipeline between the high-pressure pressure stabilizing valve 7 and the high-pressure circulation pump 9. The high-pressure accumulator 8 can further reduce the pressure fluctuation of the high-pressure circuit.

[0035] The high-pressure circuit uses a high-pressure circulation pump 9 as a power circulation pump, and can adjust the flow rate of the circuit by variable frequency to achieve variable flow load operation of the comprehensive performance evaluation system of the pressure coupling device. The water in the first water tank 5 is pressurized by the first booster pump 6 and replenished into the high-pressure circuit to achieve the high pressure value of the high-pressure circuit. The high pressure value of the high-pressure circuit in an actual mine depends on the depth of the mine. Generally, the operating pressure of a thousand-meter deep well is above 10MPa. The first booster pump 6 is always in a working state. When the target high pressure value is reached, the pressure of the high-pressure circuit is maintained stable by adjusting the high-pressure stabilizing valve 7 to avoid large fluctuations in the pressure of the high-pressure circuit. In addition, the high-pressure circuit has a pressure pre-balancing process for pressurizing the low-pressure process fluid of the pressure coupling device 10, which will cause the pressure of the high-pressure circuit to fluctuate periodically downward. Therefore, in addition to the first booster pump 6 being constantly working, a high-pressure accumulator 8 can also be set to further stabilize the pressure of the high-pressure circuit and reduce the pressure fluctuation amplitude of the high-pressure circuit to ensure the normal and stable operation of the evaluation system.

[0036] A low-pressure branch is provided on the connecting pipeline between the low-pressure cold water outlet 102 and the process fluid inlet of the heat exchanger 15. The low-pressure branch is used to provide low pressure to the low-pressure circuit and is composed of a second water tank 11 and a second booster pump 12. The inlet of the second booster pump 12 is connected to the second water tank 11, and the outlet of the second booster pump 12 is connected to the connecting pipeline between the low-pressure cold water outlet 102 and the heat exchanger 15.

[0037] The connecting pipeline between the outlet of the second booster pump 12 and the process fluid inlet of the heat exchanger 15 is connected to the inlet of the low-pressure stabilizing valve 13, and the outlet of the low-pressure stabilizing valve 13 is exhausted. The low-pressure stabilizing valve 13 is used to timely release pressure to prevent the low-pressure circuit pressure from continuing to rise, thereby maintaining the pressure stable.

[0038] As a preferred embodiment, a low-pressure accumulator 14 is provided on the connecting pipeline between the low-pressure stabilizing valve 13 and the heat exchanger 15 . The low-pressure accumulator 14 can further reduce the pressure fluctuation of the low-pressure circuit.

[0039] The low-pressure circuit uses a low-pressure circulation pump 16 as its power circulation pump, which can adjust the circuit flow rate with variable frequency to achieve variable flow load operation of the pressure coupling device comprehensive performance evaluation system. Water in the second water tank 11 is pressurized by the second booster pump 12 and fed into the low-pressure circuit to achieve the low-pressure value of the low-pressure circuit. In actual mines, the low-pressure value of the low-pressure circuit depends on the operating pressure of the air cooler, generally about 4 MPa. When the target low-pressure value is reached, the second booster pump 12 is turned off, and the low-pressure regulating valve 13 is used to maintain the pressure of the low-pressure circuit stable, avoiding large fluctuations in the low-pressure circuit pressure. In addition, the low-pressure circuit has a pressure pre-balancing process to relieve the high-pressure process fluid of the pressure coupling device 10, which can cause the pressure of the low-pressure circuit to fluctuate periodically. Therefore, after normal operation, the second booster pump 12 does not need to operate continuously to maintain the pressure of the low-pressure circuit. In addition, a low-pressure accumulator 14 can be provided to further stabilize the pressure of the low-pressure circuit and reduce the amplitude of pressure fluctuations in the low-pressure circuit, ensuring the normal and stable operation of the evaluation system.

[0040] In addition to constructing high-pressure and low-pressure circuits for process fluid circulation, this comprehensive performance evaluation system for a pressure-coupled device also features an auxiliary circuit for auxiliary fluid circulation. The auxiliary fluid outlet of heat exchanger 15 is connected to the auxiliary fluid inlet of condenser 2 via an auxiliary circulation pump 18, and the auxiliary fluid outlet of condenser 2 is connected to the auxiliary fluid inlet of heat exchanger 15 via an air-cooling tower 17. This way, after absorbing heat and heating in condenser 2, the auxiliary fluid enters heat exchanger 15 to cool down before recirculating in condenser 2, forming an auxiliary circuit. This auxiliary circuit is equipped with an auxiliary circulation pump 18, serving as a power circulation pump. Furthermore, an air-cooling tower 17 is installed in the pipeline where the auxiliary fluid flows from condenser 2 to heat exchanger 15. This air-cooling tower 17 can promptly remove any excess heat accumulated throughout the system through air cooling, thereby ensuring energy conservation throughout the system and enabling continuous, stable, and reliable comprehensive performance evaluation of the pressure-coupled device 10. This auxiliary circuit combines the two auxiliary fluids, the heat source required by the heat exchanger 15 (used to heat the low-pressure cold water from the low-pressure cold water outlet 102 to low-pressure hot water) and the cold source required by the condenser 2 (used to condense and cool the refrigerant), into one, thereby achieving efficient energy utilization within the comprehensive performance evaluation system of the pressure coupling device, effectively reducing the operating energy consumption of the evaluation system, and having considerable energy-saving effects.

[0041] The comprehensive performance evaluation system of the pressure coupling device is equipped with various valves, instruments and transmitters required for evaluation, which can record and save operating data such as pressure, temperature and flow. It mainly monitors the data at the four external interfaces of the pressure coupling device 10, namely: the pressure P at the high-pressure cold water inlet 101; hi , temperature T hi and flow Q hi ; Pressure P at low pressure cold water outlet 102 lo , temperature Tlo and flow Q lo ; Pressure P at low-pressure hot water inlet 103 li , temperature T li and flow Q li ; Pressure P at the high-pressure hot water outlet 104 ho , temperature T ho and flow Q ho .

[0042] The acquired operating data is the instantaneous value at each moment. The data over an operating cycle or longer period can be averaged and the following calculation can be performed to obtain the performance evaluation data of the pressure coupling device 10:

[0043] (1) Pressure data

[0044] Calculate the average pressure at the high-pressure cold water inlet 101, low-pressure cold water outlet 102, low-pressure hot water inlet 103 and high-pressure hot water outlet 104 of the pressure coupling device 10, and record them as high-pressure cold water inlet pressure (P hi ) avg , low pressure cold water outlet pressure (P lo ) avg , low pressure hot water inlet pressure (P li ) avg and high pressure hot water outlet pressure (P ho ) avg .

[0045] The upward and downward fluctuation range of high-pressure cold water inlet pressure: (P hi ) max -(P hi ) avg 、(P hi ) avg -(P hi ) min .

[0046] The upward and downward fluctuation range of high-pressure hot water outlet pressure: (P ho ) max -(P ho ) avg 、(P ho ) avg -(P ho ) min .

[0047] The maximum amplitude of the high-pressure circuit pressure fluctuation is the maximum value among the above four fluctuation amplitudes, which is recorded as P hm .

[0048] High pressure resistance loss of the pressure coupling device 10: ΔP h =(P hi ) avg-(P ho ) avg .

[0049] Low-pressure hot water inlet pressure upward and downward fluctuation range: (P li ) max -(P li ) avg 、(P li ) avg -(P li ) min .

[0050] Low pressure cold water outlet pressure upward and downward fluctuation range: (P lo ) max -(P lo ) avg 、(P lo ) avg -(P lo ) min .

[0051] The maximum amplitude of the low-pressure circuit pressure fluctuation is the maximum value among the above four fluctuation amplitudes, which is recorded as P lm .

[0052] Low-pressure resistance loss of the pressure coupling device 10: ΔP l =(P li ) avg -(P lo ) avg .

[0053] (2) Temperature data

[0054] Calculate the average temperature of the high-pressure cold water inlet 101, low-pressure cold water outlet 102, low-pressure hot water inlet 103 and high-pressure hot water outlet 104 of the pressure coupling device 10, and record them as high-pressure cold water inlet temperature (T hi ) avg , low pressure cold water outlet temperature (T lo ) avg , low pressure hot water inlet temperature (T li ) avg and high pressure hot water outlet temperature (T ho ) avg .

[0055] Maximum temperature rise of cold water outlet of pressure coupling device 10: T r =(T lo –T hi ) max .

[0056] Maximum temperature drop of hot water outlet of pressure coupling device 10: T d =(T li –Tho ) max .

[0057] (3) Traffic data

[0058] Calculate the average flow rate at the high-pressure cold water inlet 101, low-pressure cold water outlet 102, low-pressure hot water inlet 103 and high-pressure hot water outlet 104 of the pressure coupling device 10, and record them as high-pressure cold water inlet flow rate (Q hi ) avg , low pressure cold water outlet flow (Q lo ) avg , low pressure hot water inlet flow (Q li ) avg and high pressure hot water outlet flow (Q ho ) avg .

[0059] The upward and downward fluctuation range of the high-pressure cold water inlet flow rate: (Q hi ) max -(Q hi ) avg 、(Q hi ) avg -(Q hi ) min .

[0060] The upward and downward fluctuation range of high-pressure hot water outlet flow: (Q ho ) max -(Q ho ) avg 、(Q ho ) avg -(Q ho ) min .

[0061] The maximum fluctuation amplitude of the high-pressure circuit flow is the maximum value among the above four fluctuation amplitudes, which is recorded as Q hm .

[0062] Internal leakage of the pressure coupling device 10 (i.e. leakage from the high-pressure circuit to the low-pressure circuit): ΔQ h =(Q hi ) avg -(Q ho ) avg .

[0063] Low-pressure hot water inlet flow rate upward and downward fluctuation range: (Q li ) max -(Q li ) avg 、(Q li ) avg -(Q li ) min .

[0064] Low pressure cold water outlet flow rate upward and downward fluctuation range: (Q lo ) max -(Q lo ) avg 、(Q lo ) avg -(Q lo ) min .

[0065] The maximum fluctuation amplitude of the low-pressure circuit flow is the maximum value among the above four fluctuation amplitudes, which is recorded as Q lm .

[0066] (4) Theoretical efficiency of the device

[0067] The theoretical efficiency of the device refers to the pressure conversion efficiency of the pressure coupling device 10, which is generally calculated based on the inlet and outlet pressures and flow rates of the pressure coupling device 10. The calculation formula is as follows:

[0068] Theoretical efficiency of the device: η=((P ho)avg ×(Q ho ) avg +(P lo ) avg ×(Q lo ) avg ) / ((P hi ) avg ×(Q hi ) avg +(P li ) avg ×(Q li ) avg )×100%.

[0069] By calculating and processing the operating data, the main performance indicators of the pressure coupling device 10 to be evaluated can be obtained, especially its high-pressure resistance loss ΔP h , low pressure resistance loss ΔP l , Maximum temperature rise of cold water outlet T r , internal leakage ΔQ h And parameter data such as the device theoretical efficiency η.

[0070] The working process of the above-mentioned pressure coupling device comprehensive performance evaluation system is as follows:

[0071] After completing the charging and exhaust of refrigerant, process fluid, and auxiliary fluid in the corresponding circuits of the entire system, the pressure coupling device 10 to be evaluated is first operated to switch in an orderly manner according to the set control strategy. Then, the high-pressure circulation pump 9 and the low-pressure circulation pump 16 are turned on and adjusted to the set flow rate. The first booster pump 6 and the second booster pump 12 are turned on to pressurize the high-pressure circuit and the low-pressure circuit respectively. When the high-pressure circuit reaches the target high pressure value (e.g., 10 MPa) and the low-pressure circuit reaches the target low pressure value (e.g., 4 MPa), the high-pressure regulating valve 7 and the low-pressure regulating valve 13 are opened to maintain the pressure stability of the two circuits, while the high-pressure accumulator 8 and the low-pressure accumulator 14 are in normal working condition. Then, the refrigeration unit, auxiliary circulation pump 18, air cooling tower 17 and other equipment are operated to ensure that the high-pressure cold water inlet 101 of the pressure coupling device 10 to be evaluated reaches the target low temperature value (e.g., 3°C) and the low-pressure hot water inlet 103 reaches the target high temperature value (e.g., 18°C). After that, the system enters the normal operation stage, monitoring and recording the pressure, flow and temperature data at the four interfaces of the pressure coupling device 10 to be evaluated. After running for several cycles, the above data are calculated and processed to evaluate the comprehensive performance of the pressure coupling device 10 to be evaluated.

[0072] Although the preferred embodiments of the present invention have been described above in conjunction with the accompanying drawings, the present invention is not limited to the above-mentioned specific embodiments. The above-mentioned specific embodiments are merely illustrative and not restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms of specific changes without departing from the scope of protection of the present invention and the claims. These all fall within the scope of protection of the present invention.

Claims

1. A comprehensive performance evaluation system for a pressure coupling device, wherein the pressure coupling device used for evaluation comprises a high-pressure cold water inlet, a low-pressure cold water outlet, a low-pressure hot water inlet, and a high-pressure hot water outlet; characterized in that: include: A refrigeration unit using a refrigerant cycle, comprising a compressor, a condenser, an expansion valve, and an evaporator; the outlet of the compressor is connected to the refrigerant inlet of the condenser, the refrigerant outlet of the condenser is connected to the inlet of the expansion valve, the outlet of the expansion valve is connected to the refrigerant inlet of the evaporator, and the refrigerant outlet of the evaporator is connected to the inlet of the compressor; The high-pressure hot water outlet of the pressure coupling device is connected to the process fluid inlet of the evaporator, and the process fluid outlet of the evaporator is connected to the high-pressure cold water inlet of the pressure coupling device through a high-pressure circulation pump; The low-pressure cold water outlet of the pressure coupling device is connected to the process fluid inlet of the heat exchanger, and the process fluid outlet of the heat exchanger is connected to the low-pressure hot water inlet of the pressure coupling device through a low-pressure circulation pump; A high-pressure branch is provided between the evaporator and the high-pressure circulation pump, the high-pressure branch including a first water tank and a first pressure pump; a high-pressure stabilizing valve is provided between the first pressure pump and the high-pressure circulation pump; A low-pressure branch is set between the low-pressure cold water outlet of the pressure coupling device and the heat exchanger, and the low-pressure branch includes a second water tank and a second boosting pump; a low-pressure stabilizing valve is set between the second boosting pump and the heat exchanger.

2. A comprehensive performance evaluation system for a pressure coupling device according to claim 1, characterized in that: The auxiliary fluid outlet of the heat exchanger is connected to the auxiliary fluid inlet of the condenser through the auxiliary circulation pump, and the auxiliary fluid outlet of the condenser is connected to the auxiliary fluid inlet of the heat exchanger through the air cooling tower.

3. A comprehensive performance evaluation system for a pressure coupling device according to claim 1 or 2, characterized in that: The inlet of the first pressure pump is connected to the first water tank, and the outlet of the first pressure pump is connected to the connecting pipeline between the evaporator and the high-pressure circulation pump.

4. A comprehensive performance evaluation system for a pressure coupling device according to claim 1 or 2, characterized in that: A high-pressure accumulator is provided on the connecting pipeline between the high-pressure pressure stabilizing valve and the high-pressure circulation pump.

5. A comprehensive performance evaluation system for a pressure coupling device according to claim 1 or 2, characterized in that: The inlet of the second booster pump is connected to the second water tank, and the outlet of the second booster pump is connected to the connecting pipeline between the low-pressure cold water outlet of the pressure coupling device and the heat exchanger.

6. A comprehensive performance evaluation system for a pressure coupling device according to claim 1 or 2, characterized in that: A low-pressure accumulator is provided on the connecting pipeline between the low-pressure stabilizing valve and the heat exchanger.

7. A comprehensive performance evaluation system for a pressure coupling device according to claim 1 or 2, characterized in that: Used to monitor: the pressure P at the high-pressure cold water inlet hi , temperature T hi and flow Q hi ; The pressure P at the low-pressure cold water outlet lo , temperature T lo and flow Q lo The low-pressure hot water inlet pressure P li , temperature T li and flow Q li The pressure P at the high-pressure hot water outlet ho , temperature T ho and flow Q ho ; Thus, the high pressure resistance loss ΔP of the pressure coupling device is obtained h and low pressure resistance loss ΔP l , Maximum temperature rise of cold water outlet T r , internal leakage ΔQ h and the device theoretical efficiency η.

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