J-t valve refrigeration effect evaluation method and j-t valve refrigeration effect evaluation device

Abstract

The application provides a J-T valve refrigeration effect evaluation method and a J-T valve refrigeration effect evaluation device. A heat exchanger and a J-T valve to be evaluated are connected in series to an evaluation pipeline. A pressure gas supply device is connected to the evaluation pipeline to supply pressure gas to the evaluation pipeline. An outlet of the evaluation pipeline is connected to an inlet of a heat exchange pipeline. The J-T valve refrigeration effect evaluation method comprises the following steps: the pressure gas supply device supplies pressure gas to the evaluation pipeline; the pressure gas flows through the heat exchanger and the J-T valve to be evaluated in sequence; a pre-valve temperature meter and a post-valve temperature meter detect the temperatures before and after the J-T valve to be evaluated, respectively; a first pre-valve pressure gauge and a post-valve pressure gauge detect the pressures before and after the J-T valve to be evaluated, respectively; and the pressure gas flowing to the J-T valve to be evaluated is pre-cooled through the heat exchanger, and the pressure gas flowing out of the J-T valve to be evaluated is heated, thereby solving the technical problem that the refrigeration effect of the J-T valve physical refrigeration is difficult to accurately evaluate.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of the shallow cooling process of oil and gas processing, and particularly relates to a J-T valve refrigeration effect evaluation method and a J-T valve refrigeration effect evaluation device. BACKGROUND

[0002] Natural gas often contains various components when it enters the ground surface, and at this time, the gas quality conditions for external transportation cannot be met. In order to make the natural gas meet the gas quality requirements for external transportation, some components with other functions need to be separated and utilized. The natural gas shallow cooling process is one of many separation processes, which separates condensate oil from natural gas by reducing the temperature to several tens of degrees below zero.

[0003] The shallow cooling process mainly includes propane refrigeration and J-T valve refrigeration. Compared with propane refrigeration, the advantage of J-T valve refrigeration lies in simple process, compact structure, low cost, high reliability and the like.

[0004] Chinese patent CN110627609B discloses an ethane recovery method combining mixed refrigerant and propane auxiliary refrigeration. In the conventional ethane recovery process, the mixed refrigerant is used for precooling to below-70 DEG C, and then propane auxiliary refrigeration is used to realize ethane recovery. Chinese patent CN110563540B discloses an ethane recovery method combining pre-pressurization and propane refrigeration. The method is used for low-pressure rich gas, and the ethane recovery rate is improved by using a compressor to pressurize first, then using an expander to precool, and then using conventional propane refrigeration. Chinese patent application CN116481261A discloses a medium-pressure deep cooling light hydrocarbon recovery method for natural gas containing benzene, which can alleviate the problem of freezing and blocking after the J-T valve. Chinese patent application CN115926864A discloses a nitrogen removal system for natural gas containing nitrogen. The system is provided with three J-T valves as a whole, and the recovery rate of the natural gas and the repeated utilization rate of the cold energy are improved.

[0005] However, the refrigeration effect of the J-T valve cannot be predicted on site, and can only be predicted by software simulation or theoretical calculation.

[0006] At present, the main improvement is based on propane refrigeration or some J-T valve refrigeration with special purposes, and the refrigeration effect evaluation, especially the J-T valve refrigeration effect evaluation, cannot be realized. SUMMARY

[0007] The purpose of the present application is to provide a J-T valve refrigeration effect evaluation method and a J-T valve refrigeration effect evaluation device, so as to solve the technical problem that the refrigeration effect of the physical refrigeration of the J-T valve is difficult to accurately evaluate.

[0008] The above object of the present application can be achieved by the following technical solution.

[0009] The present application provides a J-T valve refrigeration effect evaluation method and system.

[0010] A pressure gas supply device;

[0011] An evaluation unit comprising an evaluation pipeline, a heat exchanger, a J-T valve to be evaluated, a pre-valve temperature meter, a post-valve temperature meter, a first pre-valve pressure gauge and a post-valve pressure gauge, the heat exchanger and the J-T valve to be evaluated are connected in series to the evaluation pipeline, the pre-valve temperature meter and the post-valve temperature meter are connected to the evaluation pipeline and are located before and after the J-T valve to be evaluated respectively, the first pre-valve pressure gauge and the post-valve pressure gauge are connected to the evaluation pipeline and are located before and after the J-T valve to be evaluated respectively, and the pre-valve temperature meter is located before the J-T valve to be evaluated and after the heat exchanger;

[0012] The pressure gas supply device is connected to the evaluation pipeline to deliver pressure gas to the evaluation pipeline; the heat exchanger comprises a heat exchange pipeline, and the outlet of the evaluation pipeline is connected to the inlet of the heat exchange pipeline;

[0013] The J-T valve refrigeration effect evaluation method comprises:

[0014] Step S10, the pressure gas supply device delivers pressure gas to the evaluation pipeline;

[0015] Step S20, the pressure gas flows through the heat exchanger and the J-T valve to be evaluated in sequence, the pre-valve temperature meter and the post-valve temperature meter detect the temperatures before and after the J-T valve to be evaluated respectively, and the first pre-valve pressure gauge and the post-valve pressure gauge detect the pressures before and after the J-T valve to be evaluated respectively;

[0016] Step S30, the gas flowing out of the evaluation pipeline flows into the heat exchanger through the heat exchange pipeline and exchanges heat with the pressure gas flowing to the J-T valve to be evaluated.

[0017] In a preferred embodiment, the J-T valve refrigeration effect evaluation system comprises a second pre-valve pressure gauge connected to the evaluation pipeline, the post-valve pressure gauge is located after the post-valve temperature meter, the first pre-valve pressure gauge is located after the pre-valve temperature meter, and the second pre-valve pressure gauge is located before the heat exchanger.

[0018] In a preferred embodiment, the J-T valve refrigeration effect evaluation system comprises a flow meter, which is arranged between the heat exchanger and the pre-valve temperature meter.

[0019] In the preferred embodiment, the J-T valve refrigeration effect evaluation method comprises: calculating the pressure drop through the detection values of the first pre-valve pressure gauge and the post-valve pressure gauge; characterizing the refrigeration effect through the detection values of the pre-valve thermometer and the post-valve thermometer; establishing the relationship among the refrigeration effect, the pressure drop, and the flow value detected by the flow meter.

[0020] In the preferred embodiment, the pressure gas supply device comprises a gas supply pipeline, an intake compressor, a gas tank, an air cooler, a first valve, and a second valve. The intake compressor, the air cooler, and the gas tank are connected in series in the gas supply pipeline. The first valve is arranged before the intake compressor, and the second valve is arranged between the air cooler and the gas tank.

[0021] In the preferred embodiment, the air cooler comprises an air cooling pipeline, a plurality of variable frequency fans, and a plurality of power frequency fans. The variable frequency fans and the power frequency fans are used to blow air into the air cooling pipeline, respectively.

[0022] In the preferred embodiment, the pressure gas supply device comprises a booster compressor connected in series after the gas tank.

[0023] In the preferred embodiment, the compression ratios of the intake compressor and the booster compressor are adjusted to keep the gas pressure inside the gas tank stable.

[0024] The present application provides a J-T valve refrigeration effect evaluation device applied to the J-T valve refrigeration effect evaluation method. The J-T valve refrigeration effect evaluation device comprises a pressure gas supply device and an evaluation module. The evaluation module comprises an evaluation pipeline, a heat exchanger, a pre-valve thermometer, a post-valve thermometer, a first pre-valve pressure gauge, and a post-valve pressure gauge. The heat exchanger, the pre-valve thermometer, and the post-valve thermometer are connected in series to the evaluation pipeline. A detection interface for connecting a J-T valve to be evaluated is arranged between the first pre-valve pressure gauge and the post-valve thermometer. The pre-valve thermometer is located before the detection interface and after the heat exchanger.

[0025] The pressure gas supply device is connected to the evaluation pipeline to deliver pressure gas to the evaluation pipeline. The heat exchanger comprises a heat exchange pipeline. The outlet of the evaluation pipeline is connected to the inlet of the heat exchange pipeline.

[0026] In a preferred embodiment, the pressurized gas supply device includes a gas supply pipeline, an intake compressor, a gas storage tank, an air cooler, a first valve, a second valve, and a booster compressor. The intake compressor, the air cooler, and the gas storage tank are connected in series in the gas supply pipeline. The first valve is located before the intake compressor, and the second valve is located between the air cooler and the gas storage tank. The booster compressor is connected in series after the gas storage tank.

[0027] The features and advantages of this invention are:

[0028] The JT valve cooling effect evaluation system detects the temperature of the gas output from the pressurized gas supply device before and after passing through the JT valve under evaluation, thus evaluating the cooling effect of the JT valve under corresponding operating conditions. Furthermore, a heat exchanger utilizes the temperature difference between the gas cooled by the JT valve and the gas newly entering the evaluation pipeline to pre-cool the gas entering the evaluation pipeline, raising the temperature of the gas cooled by the JT valve. This invention provides a basis for subsequent verification of the rationality of the shallow cooling process and for determining whether freezing blockage is likely to occur in on-site conditions. It facilitates the selection and design of JT valves, reduces the possibility of unreasonable design, and improves the economic efficiency of the process. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 A schematic diagram of the JT valve refrigeration effect evaluation system used in the JT valve refrigeration effect evaluation method provided by the present invention;

[0031] Figure 2 for Figure 1 The diagram shows the structure of the air cooler in the JT valve refrigeration effect evaluation system.

[0032] Figure 3 This is a schematic diagram of the JT valve cooling effect evaluation method provided by the present invention.

[0033] Explanation of icon numbers:

[0034] 100. Pressurized gas supply device;

[0035] 1. Valve No. 1; 4. Valve No. 2;

[0036] 2. Intake compressor; 21. Air supply pipeline;

[0037] 3. Air cooler; 31. Air cooling pipeline; 32. Frequency conversion fan; 33. Industrial frequency fan; 34. Controller; 35. Temperature transmitter;

[0038] 16. Gas storage tank; 17. Gas storage tank supporting pressure gauge; 5. Vent valve; 161. Blowdown valve;

[0039] 600. Evaluation unit;

[0040] 6. No. 3 valve; 60. Evaluation pipeline;

[0041] 7. Booster compressor; 81. First pre-valve pressure gauge; 82. Second pre-valve pressure gauge;

[0042] 15. No. 4 valve;

[0043] 9. Heat exchanger; 91. Heat exchange pipeline; 92. Main pipeline;

[0044] 10. Flow meter;

[0045] 11. Pre-valve temperature gauge;

[0046] 12. To-be-evaluated J-T valve;

[0047] 13. Post-valve temperature gauge; 14. Post-valve pressure gauge. DETAILED DESCRIPTION

[0048] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0049] Scheme one

[0050] The present application provides a J-T valve refrigeration effect evaluation method, which comprises the following steps: Figure 1As shown, the J-T valve refrigeration effect evaluation system used includes: a pressure gas supply device 100 and an evaluation unit 600, the evaluation unit 600 includes an evaluation pipeline 60, a heat exchanger 9, a J-T valve 12 to be evaluated, a pre-valve temperature meter 11, a post-valve temperature meter 13, a first pre-valve pressure gauge 81 and a post-valve pressure gauge 14, the heat exchanger 9 and the J-T valve 12 to be evaluated are connected in series to the evaluation pipeline 60, the pre-valve temperature meter 11 and the post-valve temperature meter 13 are connected to the evaluation pipeline 60 and are located before and after the J-T valve 12 to be evaluated respectively, the first pre-valve pressure gauge 81 and the post-valve pressure gauge 14 are connected to the evaluation pipeline 60 and are located before and after the J-T valve 12 to be evaluated respectively, and the pre-valve temperature meter 11 is located before the J-T valve 12 to be evaluated and after the heat exchanger 9; the pressure gas supply device 100 is connected with the evaluation pipeline 60 to deliver pressure gas to the evaluation pipeline 60; the heat exchanger 9 includes a heat exchange pipeline 91, and an outlet of the evaluation pipeline 60 is connected with an inlet of the heat exchange pipeline 91; as Figure 3 As shown, the J-T valve refrigeration effect evaluation method includes: step S10, the pressure gas supply device 100 delivers pressure gas to the evaluation pipeline 60; step S20, the pressure gas flows through the heat exchanger 9 and the J-T valve 12 to be evaluated in sequence, the pre-valve temperature meter 11 and the post-valve temperature meter 13 detect the temperatures before and after the J-T valve 12 to be evaluated respectively, and the first pre-valve pressure gauge 81 and the post-valve pressure gauge 14 detect the pressures before and after the J-T valve 12 to be evaluated respectively; step S30, the gas flowing out of the evaluation pipeline 60 flows into the heat exchanger 9 through the heat exchange pipeline 91 and exchanges heat with the pressure gas flowing to the J-T valve 12 to be evaluated.

[0051] The J-T valve refrigeration effect evaluation system detects the temperatures before and after the J-T valve 12 to be evaluated through the gas output by the pressure gas supply device 100, so as to evaluate the refrigeration effect of the J-T valve 12 to be evaluated; and the heat exchanger 9 exchanges heat by using the temperature difference between the gas after refrigeration by the J-T valve 12 to be evaluated and the gas newly entering the evaluation pipeline 60, pre-cools the gas newly entering the evaluation pipeline 60, and increases the temperature of the gas after refrigeration, which is beneficial to the actual production condition. Through the present application, the subsequent verification of the rationality of the shallow cooling process and the judgment of whether the freezing blockage is prone to occur in the field working condition can be provided, the J-T valve can be conveniently selected and designed, the possibility of unreasonable design is reduced, and the economic efficiency of the process is improved.

[0052] Specifically, the heat exchanger 9 includes a heat exchange pipeline 91 and a main pipeline 92, and the main pipeline 92 of the heat exchanger 9 is arranged in series in the evaluation pipeline 60, that is, Figure 1As shown, the pressure gas flows into and out of the main pipeline 92 of the heat exchanger 9, and then enters the evaluation pipeline 60 and continues to flow to the J-T valve 12 to be evaluated. During the process of flowing in the main pipeline 92 of the heat exchanger 9, the pressure gas exchanges heat with the gas flowing through the heat exchange pipeline 91. Since the gas in the heat exchange pipeline 91 comes from the outlet of the evaluation pipeline 60 and has a lower temperature, the pressure gas in the main pipeline 92 of the heat exchanger 9 is pre-cooled and the temperature is reduced; and the gas flowing out of the J-T valve 12 to be evaluated increases in temperature after flowing through the evaluation pipeline 60 and then passing through the heat exchanger 9. As shown in Figure 1 As shown, the outlet of the heat exchange pipeline 91 is provided with the fourth valve 15.

[0053] As shown in Figure 1 As shown, along the flow direction of the pressure gas, the upstream of the J-T valve 12 to be evaluated is before the J-T valve 12 to be evaluated, and the downstream of the J-T valve 12 to be evaluated is after the J-T valve 12 to be evaluated.

[0054] In an embodiment, the J-T valve refrigeration effect evaluation system comprises the second valve front pressure gauge 82 connected to the evaluation pipeline 60, the valve rear pressure gauge 14 located after the valve rear thermometer 13, the second valve front pressure gauge 82 located before the heat exchanger 9, and the first valve front pressure gauge 81 located after the valve front thermometer 11, so as to obtain the pressure condition of the gas flowing through the J-T valve 12 to be evaluated, evaluate the relationship between the gas flow pressure and the refrigeration effect of the J-T valve 12 to be evaluated, and calculate the pressure loss through the heat exchanger 9 by the detection values of the valve rear pressure gauge 14, the second valve front pressure gauge 82 and the first valve front pressure gauge 81.

[0055] Further, the J-T valve refrigeration effect evaluation system comprises the flow meter 10 arranged between the heat exchanger 9 and the valve front thermometer 11, which is used to record the gas flow under the experimental working condition, so as to evaluate the relationship between the gas flow and the refrigeration effect of the J-T valve 12 to be evaluated.

[0056] The first valve front pressure gauge 81, the second valve front pressure gauge 82, the valve rear pressure gauge 14 and the flow meter 10 respectively detect the gas pressure and flow of the pressure gas, so as to detect the pressure and flow conditions under the actual working condition; and the valve front thermometer 11 and the valve rear thermometer 13 can be respectively used to observe the temperature values of the gas before and after passing through the J-T valve 12 to be evaluated, so as to realize the quantitative evaluation of the refrigeration effect of different J-T valves 12 to be evaluated under the same working condition.

[0057] In one embodiment, the method for evaluating the cooling effect of the JT valve includes: calculating the pressure drop using the values ​​detected by the first pressure gauge 81 before the valve and the pressure gauge 14 after the valve; characterizing the cooling effect using the values ​​detected by the thermometer 11 before the valve and the thermometer 13 after the valve; and establishing the relationship between the cooling effect, pressure drop, and flow rate detected by the flow meter 10, thereby accurately obtaining the cooling effect of the JT valve 12 under experimental conditions, facilitating the selection and design of the JT valve, and improving the economic efficiency of the process. Specifically, the relationship between the cooling effect, pressure drop, and flow rate detected by the flow meter 10 can be recorded in the form of tables, for example, including the correspondence between pressure drop, flow rate, and cooling effect under actual operating conditions.

[0058] The JT valve 12 to be evaluated utilizes the Joule-Thomson effect to cool gases, and its application scenarios are mostly in natural gas liquefaction processes.

[0059] In one embodiment, the pressurized gas supply device 100 includes a gas supply line 21, an intake compressor 2, a gas storage tank 16, an air cooler 3, a first valve 1, and a second valve 4. The intake compressor 2, air cooler 3, and gas storage tank 16 are connected in series in the gas supply line 21. The first valve 1 is located before the intake compressor 2, and the second valve 4 is located between the air cooler 3 and the gas storage tank 16. The intake compressor 2 can deliver outside gas into the gas storage tank 16 and bring the internal pressure of the gas storage tank 16 to a certain value. The gas used for evaluation is generally air, but a gas consistent with the actual operating conditions can also be used. The air cooler 3 can reduce the temperature of the gas after passing through the intake compressor 2. The gas storage tank 16 acts as a buffer, ensuring a sufficient gas supply for subsequent evaluation processes. Figure 1 As shown, the gas storage tank 16 is connected to a vent valve 5, a drain valve 161, and a pressure gauge 17. The pressure gauge 17 is used to observe the remaining gas level inside the gas storage tank 16. The vent valve 5 releases internal pressure under special circumstances. Considering that water may be generated after passing through the air cooler 3, the drain valve 161 is added to facilitate the evaluation of the system's long-term reliable operation. Specifically, under the action of the intake compressor 2, external gas enters the gas storage tank 16 through valve 1 and valve 4.

[0060] Furthermore, the air cooler 3 includes an air-cooled duct 31, multiple variable frequency fans 32, and multiple fixed frequency fans 33. The variable frequency fans 32 and fixed frequency fans 33 are used to blow air into the air-cooled duct 31, which is connected in series with the air supply line 21. As the gas flows through the air-cooled duct 31, its temperature decreases due to the air-cooling effect. Figure 2As shown, the air cooler 3 adopts frequency conversion and power frequency combination to controllably cool the gas flowing to the gas tank 16. Preferably, the air cooler 3 includes three frequency conversion fans 32 and three power frequency fans 33, which are both intelligently controllable through the controller 34 and the temperature transmitter 35.

[0061] Further, the pressure gas supply device 100 includes a booster compressor 7 connected in series after the gas tank 16. The gas tank 16 provides sufficient gas source for the booster compressor 7, which increases the gas pressure from the gas tank 16 again to reach the corresponding pressure condition, ensures that the gas has sufficient pressure energy to generate the Joule-Thomson effect, and reduces the gas temperature to ensure the smooth implementation of the experiment. The gas pressure entering the evaluation pipeline 60 can also be adjusted through the booster compressor 7 to test the refrigeration effect of the J-T valve 12 to be evaluated under different pressure conditions.

[0062] Specifically, the gas passing through the booster compressor 7 exchanges heat with the refrigerated gas in the heat exchanger 9 to pre-cool and increase the temperature of the refrigerated gas. The pressure value of the gas after passing through the booster compressor 7 can be observed through the second pre-valve pressure gauge 82, and the post-valve pressure gauge 14 monitors the pressure drop of the gas after passing through the J-T valve 12 to be evaluated. Preferably, a third valve 6 is arranged between the booster compressor 7 and the gas tank 16.

[0063] In an embodiment, the J-T valve refrigeration effect evaluation method provided by the present application includes adjusting the compression ratio of the gas inlet compressor 2 and the booster compressor 7 to keep the gas pressure in the gas tank 16 stable, which is conducive to keeping the pressure and flow conditions of the experimental working condition stable. During the experiment, if it is found that the gas pressure in the gas tank 16 gradually decreases or gradually increases, the compression ratio of the gas inlet compressor 2 and the booster compressor 7 can be adjusted to balance the gas inlet and outlet rates of the gas tank 16 and meet the preset working condition of the experiment.

[0064] Through the J-T valve refrigeration effect evaluation method provided by the present application, the refrigeration of various J-T valves under different working conditions can be evaluated, the temperature change of the gas before and after passing through the J-T valve can be accurately analyzed, the influence of different inlet pressures, different gas components, and different J-T valve models on the temperature before and after throttling can be analyzed; and a simple and feasible J-T valve refrigeration effect evaluation method is established, which provides a basis for selecting corresponding J-T valve types for on-site cryogenic process under different working conditions, is more consistent with on-site working conditions, is convenient for J-T valve selection and design, and can provide a basis for subsequent verification of the rationality of the cryogenic process and judgment of whether frozen plugging is likely to occur in the on-site working condition.

[0065] The step S10, the step S20 and the step 30 in the J-T valve refrigeration effect evaluation method provided by the application can be implemented simultaneously or sequentially, and the order of the three is not limited. The specific operation steps include:

[0066] (1) install the J-T valve 12 to be evaluated into the evaluation unit 600;

[0067] (2) open the first valve 1 and the second valve 4, and keep the remaining valves closed, start the air inlet compressor 2 and the air cooler 3, and gradually increase the internal pressure of the gas storage tank 16;

[0068] (3) when the pressure of the gas storage tank 16 reaches a predetermined value, open all the valves except the vent valve 5 at the upper end of the gas storage tank 16, and open the booster compressor 7;

[0069] (4) detect whether the evaluation system can work normally, including the sealing of the pipeline, the adjustment ability of the booster compressor 7, whether the air cooler 3 and the heat exchanger 9 can achieve heat exchange, whether the valves can be normally opened and closed, whether the instrument is accurate, etc.;

[0070] (5) adjust the air inlet compressor 2 and the booster compressor 7, so that the experimental conditions gradually tend to be stable, and reach the set experimental conditions, and record the pressure before and after the J-T valve 12 to be evaluated and the flow rate of the gas passing through at this time;

[0071] (6) check the readings on the valve front temperature meter 11 and the valve rear temperature meter 13, and record the temperatures of the gas before and after the J-T valve 12 to be evaluated under the corresponding working conditions;

[0072] (7) after the experiment is completed, first close the air inlet compressor 2 and the booster compressor 7, then close the first valve 1 in front of the air inlet compressor 2, slowly open the vent valve 5, and when the internal pressure of the gas storage tank is reduced to normal pressure as shown by the pressure gauge 17 matched with the gas storage tank, close the vent valve 5, finally close all the remaining valves on the pipeline, and take out the J-T valve 12 to be evaluated from the evaluation unit 600;

[0073] (8) end the experiment.

[0074] Scheme two

[0075] The application provides a J-T valve refrigeration effect evaluation device applied to the J-T valve refrigeration effect evaluation method, like Figure 1As shown, the J-T valve refrigeration effect evaluation device includes a pressure gas supply device 100 and an evaluation module, the evaluation module includes an evaluation pipeline 60, a heat exchanger 9, a pre-valve thermometer 11 and a post-valve thermometer 13, the heat exchanger 9, the pre-valve thermometer 11 and the post-valve thermometer 13 are connected in series on the evaluation pipeline 60, a detection interface for connecting the J-T valve 12 to be evaluated is arranged between the pre-valve thermometer 11 and the post-valve thermometer 13, and the pre-valve thermometer 11 is located before the detection interface and after the heat exchanger 9; the pressure gas supply device 100 is connected with the evaluation pipeline 60 to deliver pressure gas to the evaluation pipeline 60; the heat exchanger 9 includes a heat exchange pipeline 91, and the outlet of the evaluation pipeline 60 is connected with the inlet of the heat exchange pipeline 91.

[0076] The J-T valve 12 to be evaluated is installed on the detection interface of the evaluation module to form an evaluation unit 600, which cooperates with the pressure gas supply device 100 to evaluate the refrigeration effect of the J-T valve 12 to be evaluated. The J-T valve refrigeration effect evaluation device has all or at least part of the technical features and technical effects of the J-T valve refrigeration effect evaluation method described above, and will not be described here.

[0077] In an embodiment of the present application, the pressure gas supply device 100 includes a gas supply pipeline 21, an intake compressor 2, a gas tank 16, an air cooler 3, a first valve 1, a second valve 4 and a booster compressor 7, the intake compressor 2, the air cooler 3 and the gas tank 16 are connected in series on the gas supply pipeline 21, the first valve 1 is arranged before the intake compressor 2, the second valve 4 is arranged between the air cooler 3 and the gas tank 16, and the booster compressor 7 is connected in series after the gas tank 16. The intake compressor 2 delivers external gas into the gas tank 16, and makes the internal pressure of the gas tank 16 reach a certain value. The air cooler 3 reduces the temperature of the gas after passing through the intake compressor 2. The gas tank 16 plays a buffering role to provide sufficient gas source for the subsequent evaluation process. The booster compressor 7 increases the pressure of the gas from the gas tank 16 again to reach the corresponding pressure condition, so that the gas has enough pressure energy to produce the Joule-Thomson effect, reduces the temperature of the gas, and ensures the smooth implementation of the experiment.

[0078] The J-T valve refrigeration effect evaluation device provided by the present application can be applied to the oil and gas field station refrigeration process, can verify the refrigeration effect of the J-T valve, improve the process economy, and will produce greater social benefits. It can also be widely applied to various oil and gas fields, and has stronger adaptability.

[0079] The above only describes several embodiments of the present application, and those skilled in the art can make various modifications or changes to the embodiments of the present application according to the content disclosed in the application file without departing from the spirit and scope of the present application.

Claims

1. A method for evaluating refrigeration effect of a J-T valve, characterized by, The J-T valve refrigeration effect evaluation system comprises: a pressure gas supply device; an evaluation unit comprising an evaluation pipeline, a heat exchanger, a J-T valve to be evaluated, a pre-valve temperature meter, a post-valve temperature meter, a first pre-valve pressure gauge and a post-valve pressure gauge, the heat exchanger and the J-T valve to be evaluated being connected in series to the evaluation pipeline, the pre-valve temperature meter and the post-valve temperature meter being connected to the evaluation pipeline and located before and after the J-T valve to be evaluated respectively, the first pre-valve pressure gauge and the post-valve pressure gauge being connected to the evaluation pipeline and located before and after the J-T valve to be evaluated respectively, and the pre-valve temperature meter being located before the J-T valve to be evaluated and after the heat exchanger; the pressure gas supply device is connected to the evaluation pipeline to deliver pressure gas to the evaluation pipeline; and the heat exchanger comprises a heat exchange pipeline, and the outlet of the evaluation pipeline is connected to the inlet of the heat exchange pipeline. The J-T valve refrigeration effect evaluation method comprises: Step S10, the pressure gas supply device delivers pressure gas to the evaluation pipeline; Step S20, the pressure gas flows through the heat exchanger and the J-T valve to be evaluated in sequence, the pre-valve temperature meter and the post-valve temperature meter detect the temperatures before and after the J-T valve to be evaluated respectively, and the first pre-valve pressure gauge and the post-valve pressure gauge detect the pressures before and after the J-T valve to be evaluated respectively; Step S30, the gas flowing out of the evaluation pipeline flows into the heat exchanger through the heat exchange pipeline and exchanges heat with the pressure gas flowing to the J-T valve to be evaluated.

2. The J-T valve refrigeration effect evaluation method according to claim 1, wherein the J-T valve refrigeration effect evaluation system comprises a second pre-valve pressure gauge connected to the evaluation pipeline, the post-valve pressure gauge is located after the post-valve temperature meter, the first pre-valve pressure gauge is located after the pre-valve temperature meter, and the second pre-valve pressure gauge is located before the heat exchanger.

3. The J-T valve refrigeration effect evaluation method according to claim 2, wherein the J-T valve refrigeration effect evaluation system comprises a flow meter arranged between the heat exchanger and the pre-valve temperature meter.

4. The J-T valve refrigeration effect evaluation method according to claim 3, wherein the J-T valve refrigeration effect evaluation method comprises: calculating pressure drop through the detection values of the first pre-valve pressure gauge and the post-valve pressure gauge; characterizing refrigeration effect through the detection values of the pre-valve temperature meter and the post-valve temperature meter; and establishing the relationship among the refrigeration effect, the pressure drop and the flow value detected by the flow meter.

5. The J-T valve refrigeration effect evaluation method according to claim 1, wherein the pressure gas supply device comprises a gas supply pipeline, an air inlet compressor, a gas storage tank, an air cooler, a first valve and a second valve, the air inlet compressor, the air cooler and the gas storage tank are connected in series to the gas supply pipeline, the first valve is arranged before the air inlet compressor, and the second valve is arranged between the air cooler and the gas storage tank. ​ ​ ​ ​ 6. The J-T valve refrigeration effect evaluation method according to claim 5, wherein The air cooler comprises air cooling pipes, a plurality of variable frequency fans and a plurality of power frequency fans, and the variable frequency fans and the power frequency fans are used to respectively blow air into the air cooling pipes.

7. The J-T valve refrigeration effect evaluation method according to claim 5, wherein The pressure gas supply device comprises a booster compressor, and the booster compressor is connected in series after the gas storage tank.

8. The J-T valve refrigeration effect evaluation method according to claim 7, wherein The compression ratios of the intake compressor and the booster compressor are adjusted to keep the gas pressure inside the gas storage tank stable.

9. A J-T valve refrigeration effect evaluation device characterized by comprising: The J-T valve refrigeration effect evaluation device applied to any one of claims 1-8 comprises a pressure gas supply device and an evaluation module, the evaluation module comprises an evaluation pipeline, a heat exchanger, a pre-valve temperature meter and a post-valve temperature meter, the heat exchanger, the pre-valve temperature meter and the post-valve temperature meter are connected in series to the evaluation pipeline, a detection interface for connecting a J-T valve to be evaluated is arranged between the first pre-valve pressure gauge and the post-valve temperature meter, and the pre-valve temperature meter is located before the detection interface and after the heat exchanger. The pressure gas supply device is connected to the evaluation pipeline to deliver pressure gas to the evaluation pipeline; and the heat exchanger comprises a heat exchange pipeline, and the outlet of the evaluation pipeline is connected to the inlet of the heat exchange pipeline.

10. The J-T valve refrigeration effect evaluation device according to claim 9, wherein The pressure gas supply device comprises a gas supply pipeline, an intake compressor, a gas storage tank, an air cooler, a first valve and a second valve, and a booster compressor, the intake compressor, the air cooler and the gas storage tank are connected in series to the gas supply pipeline, the first valve is arranged before the intake compressor, the second valve is arranged between the air cooler and the gas storage tank, and the booster compressor is connected in series after the gas storage tank.

Images