J-T valve refrigeration effect evaluation method and J-T valve refrigeration effect evaluation device

Abstract

The invention 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, and a pressure gas supply device is connected with the evaluation pipeline to convey pressure gas to the evaluation pipeline; an outlet of the evaluation pipeline is connected with an inlet of the heat exchange pipeline; the J-T valve refrigeration effect evaluation method comprises the steps that a pressure gas supply device conveys pressure gas to an evaluation pipeline; the pressure gas sequentially flows through the heat exchanger and the to-be-evaluated J-T valve, and the upstream thermometer and the downstream thermometer respectively detect the temperatures before and after the to-be-evaluated J-T valve; the first upstream pressure gauge and the downstream pressure gauge are used for detecting the pressure before and after the J-T valve to be evaluated respectively; through the heat exchanger, the pressure gas flowing to the to-be-evaluated J-T valve is pre-cooled, and the temperature of the pressure gas flowing out of the to-be-evaluated J-T valve is raised, so that the technical problem that the refrigeration effect of physical refrigeration of the J-T valve is difficult to accurately evaluate is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of shallow cooling processes for oil and gas treatment, and particularly to a method for evaluating the refrigeration effect of a J-T valve and a device for evaluating the refrigeration effect of a J-T valve. Background Art

[0002] When natural gas enters the ground from underground, it often contains multiple components and usually cannot meet the external transportation gas quality conditions at this time. To make the natural gas meet the external transportation gas quality requirements, it is necessary to separate and utilize some components with other functions. The natural gas shallow cooling process is one of many separation processes, which reduces the temperature to dozens of degrees below zero to separate condensate oil from natural gas.

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

[0004] Chinese invention patent CN110627609B discloses a method for ethane recovery combining mixed refrigerant and propane assisted refrigeration. In the conventional ethane recovery process, the mixed refrigerant is used to pre-cool to below -70°C, and then propane assisted refrigeration is used to achieve ethane recovery; Chinese invention patent CN110563540B discloses a method for ethane recovery combining pre-boosting and propane refrigeration. This method is aimed at low-pressure rich gas, which is first pressurized by a compressor and then pre-cooled by an expander, and then the conventional propane refrigeration method is used to improve the ethane recovery rate. Chinese invention patent application CN116481261A discloses a method for recovering light hydrocarbons from medium-pressure deep-cooled benzene-containing natural gas, which can alleviate the problem of freezing blockage after the J-T valve in benzene-containing natural gas; Chinese invention patent application CN115926864A discloses a nitrogen removal system for nitrogen-containing natural gas. The system is provided with 3 J-T valves in total, which improves the recovery rate of natural gas and the reuse rate of cold energy.

[0005] However, it is often impossible to predict the refrigeration effect of the J-T valve on-site, and only the refrigeration effect of the J-T valve can be predicted by software simulation or theoretical calculation.

[0006] Currently, it is mainly for the improvement based on propane refrigeration or some J-T valve refrigeration cases with special uses. Generally, the evaluation of the refrigeration effect cannot be achieved, especially the evaluation of the refrigeration effect of the J-T valve has not been realized. Summary of the Invention

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

[0008] The above object of the present invention can be achieved by the following technical solutions:

[0009] The present invention provides a method for evaluating the refrigeration effect of a J-T valve. The J-T valve refrigeration effect evaluation system used includes:

[0010] A pressure gas supply device;

[0011] An evaluation unit, which includes an evaluation pipeline, a heat exchanger, a J-T valve to be evaluated, a thermometer before the valve, a thermometer after the valve, a first pressure gauge before the valve, and a pressure gauge after the valve. The heat exchanger and the J-T valve to be evaluated are connected in series to the evaluation pipeline. The thermometer before the valve and the thermometer after the valve are connected to the evaluation pipeline and are respectively located before and after the J-T valve to be evaluated. The first pressure gauge before the valve and the pressure gauge after the valve are connected to the evaluation pipeline and are respectively located before and after the J-T valve to be evaluated. And, the thermometer before the valve is located after the heat exchanger and before the J-T valve to be evaluated;

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

[0013] The method for evaluating the refrigeration effect of the J-T valve includes:

[0014] Step S10, the pressure gas supply device supplies 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 thermometer before the valve and the thermometer after the valve respectively detect the temperatures before and after the J-T valve to be evaluated, and the first pressure gauge before the valve and the pressure gauge after the valve respectively detect the pressures before and after the J-T valve to be evaluated;

[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 towards the J-T valve to be evaluated.

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

[0018] In a preferred embodiment, the J-T valve refrigeration effect evaluation system includes a flow meter, and the flow meter is arranged between the heat exchanger and the thermometer before the valve.

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

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

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

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

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

[0024] The present invention provides a device for evaluating the refrigeration effect of a J-T valve, which is applied to the method for evaluating the refrigeration effect of the J-T valve described above. The device for evaluating the refrigeration effect of the J-T valve includes: a pressure gas supply device and an evaluation module. The evaluation module includes 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. Moreover, 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 includes a heat exchange pipeline, and the outlet of the evaluation pipeline is connected to the inlet of the heat exchange pipeline.

[0026] In a preferred embodiment, the pressure 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 sequentially connected in series to the gas supply pipeline. The first valve is disposed before the intake compressor, and the second valve is disposed 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 the present invention are as follows:

[0028] The temperature of the gas output by the pressure gas supply device before and after flowing through the J-T valve to be evaluated is detected by a J-T valve refrigeration effect evaluation system to evaluate the refrigeration effect of the J-T valve to be evaluated under the corresponding working conditions. Moreover, the heat exchanger uses the temperature difference between the gas cooled by the J-T valve to be evaluated and the gas newly entering the evaluation pipeline for heat exchange, pre-cools the gas newly entering the evaluation pipeline, and raises the temperature of the gas cooled by the J-T valve to be evaluated. Through the present invention, a basis can be provided for subsequent verification of the rationality of the shallow cooling process and judgment of whether freezing blockage is likely to occur in the on-site working conditions, facilitating the selection and design of the J-T valve, reducing the possibility of unreasonable design, and improving the economy of the process. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0030] Figure 1 It is a schematic structural diagram of a J-T valve refrigeration effect evaluation system adopted by the J-T valve refrigeration effect evaluation method provided by the present invention;

[0031] Figure 2 For Figure 1 It is a schematic structural diagram of the air cooler in the J-T valve refrigeration effect evaluation system shown;

[0032] Figure 3 It is a schematic diagram of the J-T valve refrigeration effect evaluation method provided by the present invention.

[0033] Explanation of the reference numerals in the drawings:

[0034] 100, pressure gas supply device;

[0035] 1, first valve; 4, second valve;

[0036] 2, intake compressor; 21, gas supply pipeline;

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

[0038] 16. Gas storage tank; 17. Pressure gauge for gas storage tank; 5. Vent valve; 161. Drain valve;

[0039] 600. Evaluation unit;

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

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

[0042] 15. No. 4 valve;

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

[0044] 10. Flowmeter;

[0045] 11. Thermometer before valve;

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

[0047] 13. Thermometer after valve; 14. Pressure gauge after valve. Specific embodiments

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

[0049] Solution 1

[0050] The present invention provides a method for evaluating the refrigeration effect of a J-T valve, as Figure 1As shown in the figure, the J-T valve refrigeration effect evaluation system adopted 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 thermometer 11 before the valve, a thermometer 13 after the valve, a first pressure gauge 81 before the valve and a pressure gauge 14 after the valve. The heat exchanger 9 and the J-T valve 12 to be evaluated are connected in series to the evaluation pipeline 60. The thermometer 11 before the valve and the thermometer 13 after the valve are connected to the evaluation pipeline 60 and are respectively located before and after the J-T valve 12 to be evaluated. The first pressure gauge 81 before the valve and the pressure gauge 14 after the valve are connected to the evaluation pipeline 60 and are respectively located before and after the J-T valve 12 to be evaluated. Moreover, the thermometer 11 before the valve is located after the heat exchanger 9 and before the J-T valve 12 to be evaluated; the pressure gas supply device 100 is connected to the evaluation pipeline 60 to supply 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 to the inlet of the heat exchange pipeline 91; as Figure 3 As shown in the figure, the J-T valve refrigeration effect evaluation method includes: Step S10, the pressure gas supply device 100 supplies 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 thermometer 11 before the valve and the thermometer 13 after the valve respectively detect the temperatures before and after the J-T valve 12 to be evaluated, and the first pressure gauge 81 before the valve and the pressure gauge 14 after the valve respectively detect the pressures before and after the J-T valve 12 to be evaluated; 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 towards the J-T valve 12 to be evaluated.

[0051] The J-T valve refrigeration effect evaluation system is used to detect the temperatures of the gas output by the pressure gas supply device 100 before and after flowing through the J-T valve 12 to be evaluated, so as to evaluate the refrigeration effect of the J-T valve 12 to be evaluated; moreover, the heat exchanger 9 uses the temperature difference between the gas after being refrigerated by the J-T valve 12 and the gas newly entering the evaluation pipeline 60 to conduct heat exchange, pre-cool the gas newly entering the evaluation pipeline 60, and increase the temperature of the refrigerated gas, which is beneficial to conforming to the actual production conditions on site. Through the present invention, it can provide a basis for subsequent verification of the rationality of the shallow cooling process and judgment of whether freezing and blocking are likely to occur in the on-site working conditions, facilitate the selection and design of the J-T valve, reduce the possibility of unreasonable design, and improve the economy of the process.

[0052] Specifically, the heat exchanger 9 includes a heat exchange pipeline 91 and a main pipeline 92. The main pipeline 92 of the heat exchanger 9 is arranged in series in the evaluation pipeline 60, that is: as Figure 1As shown, the pressurized gas flows into and then out of the main pipeline 92 of the heat exchanger 9, enters the evaluation pipeline 60, and continues to flow towards the JT valve 12 to be evaluated. During the flow of the pressurized gas in the main pipeline 92 of the heat exchanger 9, it 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, therefore: the pressurized gas in the main pipeline 92 of the heat exchanger 9 is precooled and its temperature decreases; after the gas flowing out of the JT valve 12 to be evaluated flows through the evaluation pipeline 60 and then passes through the heat exchanger 9, its temperature increases. As Figure 1 shown, a fourth valve 15 is provided at the outlet of the heat exchange pipeline 91.

[0053] As Figure 1 shown, along the flow direction of the pressurized gas, the upstream of the JT valve 12 to be evaluated is before the JT valve 12 to be evaluated, and the downstream of the JT valve 12 to be evaluated is after the JT valve 12 to be evaluated.

[0054] In an embodiment, the JT valve refrigeration effect evaluation system includes a second pre-valve pressure gauge 82 connected to the evaluation pipeline 60. The post-valve pressure gauge 14 is located after the post-valve thermometer 13, the second pre-valve pressure gauge 82 is located before the heat exchanger 9, and the first pre-valve pressure gauge 81 is located after the pre-valve thermometer 11, to obtain the pressure condition of the gas flowing through the JT valve 12 to be evaluated, so as to evaluate the relationship between the gas flow pressure and the refrigeration effect of the JT valve 12 to be evaluated. Through the detected values of the post-valve pressure gauge 14, the second pre-valve pressure gauge 82 and the first pre-valve pressure gauge 81, the pressure loss through the heat exchanger 9 can also be calculated.

[0055] Furthermore, the JT valve refrigeration effect evaluation system includes a flowmeter 10. The flowmeter 10 is arranged between the heat exchanger 9 and the pre-valve thermometer 11. The flowmeter 10 is used to record the gas flow rate under the experimental conditions, so as to evaluate the relationship between the gas flow rate and the refrigeration effect of the JT valve 12 to be evaluated.

[0056] The first pre-valve pressure gauge 81, the second pre-valve pressure gauge 82, the post-valve pressure gauge 14 and the flowmeter 10 respectively detect the air pressure and flow rate of the pressurized gas to detect the pressure and flow rate conditions of the actual working conditions. The pre-valve thermometer 11 and the post-valve thermometer 13 can be respectively used to observe the temperature values of the gas before and after passing through the JT valve 12 to be evaluated, so as to quantitatively evaluate the refrigeration effects of different JT valves 12 to be evaluated under the same working conditions.

[0057] In one embodiment, the method for evaluating the refrigeration effect of the J-T valve includes: calculating the pressure drop through the measured values of the first pressure gauge before the valve 81 and the pressure gauge after the valve 14; characterizing the refrigeration effect through the measured values of the thermometer before the valve 11 and the thermometer after the valve 13; establishing the relationship among the refrigeration effect, the pressure drop, and the flow rate value detected by the flowmeter 10, so as to accurately obtain the refrigeration effect of the J-T valve 12 to be evaluated under the experimental conditions, facilitate the selection and design of the J-T valve, and improve the economy of the process. Specifically, the relationship among the refrigeration effect, the pressure drop, and the flow rate value detected by the flowmeter 10 can be recorded in the form of a table, etc., for example: including the corresponding relationship between the pressure drop, the flow rate value, and the refrigeration effect under the actual working conditions.

[0058] The J-T valve 12 to be evaluated uses the Joule-Thomson effect to refrigerate gases, and its application scenarios are mostly for the liquefaction process of natural gas.

[0059] In one embodiment, the pressure gas supply device 100 includes a gas supply pipeline 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, the air cooler 3, and the gas storage tank 16 are connected in series to the gas supply pipeline 21 in sequence. The first valve 1 is arranged before the intake compressor 2, and the second valve 4 is arranged between the air cooler 3 and the gas storage tank 16. The intake compressor 2 can transport the external gas into the gas storage tank 16 and make the internal pressure of the gas storage tank 16 reach a certain value. The gas used for evaluation is generally air, or a gas consistent with the actual working 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 plays a buffering role, enabling a sufficient gas source for the subsequent evaluation process. As Figure 1 shown, the gas storage tank 16 is connected with a vent valve 5, a blowdown valve 161, and a pressure gauge 17 for the gas storage tank. The pressure gauge 17 for the gas storage tank is used to observe the remaining amount of gas inside the gas storage tank 16; the function of the vent valve 5 is to release the internal pressure of the device under special circumstances; considering that water may be generated after passing through the air cooler 3, a blowdown valve 161 is added, which is beneficial to the long-term reliable operation of the evaluation system. Specifically, the external gas enters the gas storage tank 16 finally through the first valve 1 and the second valve 4 under the action of the intake compressor 2.

[0060] Furthermore, the air cooler 3 includes an air cooling pipeline 31, a plurality of variable-frequency fans 32, and a plurality of industrial-frequency fans 33. The variable-frequency fans 32 and the industrial-frequency fans 33 are used to blow air to the air cooling pipeline 31 respectively. The air cooling pipeline 31 is connected in series to the gas supply pipeline 21. During the process of the gas flowing through the air cooling pipeline 31, the temperature drops under the air cooling effect. As Figure 2As shown, the air cooler 3 adopts a combination of variable frequency and power frequency to controllably cool down the temperature of the gas flowing towards the gas storage tank 16. Preferably, the air cooler 3 includes 3 variable frequency fans 32 and 3 power frequency fans 33. Both the variable frequency fans 32 and the power frequency fans 33 are connected to the temperature transmitter 35 through the controller 34, enabling intelligent control.

[0061] Furthermore, the pressure gas supply device 100 includes a booster compressor 7, and the booster compressor 7 is connected in series after the gas storage tank 16. The gas storage tank 16 provides a sufficient gas source for the booster compressor 7. The booster compressor 7 raises the internal gas pressure of the gas storage tank 16 again to reach the corresponding pressure condition, ensuring that the gas has sufficient pressure energy to generate the Joule-Thomson effect and reducing the gas temperature, thus guaranteeing the smooth implementation of the experiment. The air pressure of the gas 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 for precooling and raises the temperature of the refrigerated gas. The pressure value of the gas after passing through the booster compressor 7 can be observed through the pressure gauge 82 before the second valve, and the pressure drop of the gas after passing through the J-T valve 12 to be evaluated is monitored by the pressure gauge 14 after the valve. Preferably, a third valve 6 is provided between the booster compressor 7 and the gas storage tank 16.

[0063] In an embodiment, the J-T valve refrigeration effect evaluation method provided by the present invention includes: adjusting the compression ratios of the intake compressor 2 and the booster compressor 7 to keep the internal gas pressure of the gas storage tank 16 stable, which is beneficial to ensuring the stability of the pressure and flow conditions of the experimental conditions. During the experiment, if it is found that the internal gas pressure of the gas storage tank 16 gradually decreases or gradually increases, by adjusting the compression ratios of the intake compressor 2 and the booster compressor 7, the intake and outlet rates of the gas storage tank 16 can be balanced and meet the preset experimental conditions.

[0064] Through the J-T valve refrigeration effect evaluation method provided by the present invention, the refrigeration conditions of various J-T valves under different working conditions can be evaluated, the temperature changes of the gas before and after passing through the J-T valve can be accurately analyzed, and the effects of factors such as 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, providing a basis for selecting the corresponding J-T valve type for the shallow cooling process under different field working conditions, being more in line with the field working conditions, facilitating the selection and design of the J-T valve, and providing a basis for verifying the rationality of the shallow cooling process and judging whether freeze plugging is likely to occur in the field working conditions in the future.

[0065] Steps S10, S20, and 30 in the JT valve refrigeration effect evaluation method provided by the present invention can be implemented simultaneously or successively, and the order of the three is not limited. The specific operation steps include:

[0066] (1) Install the JT valve 12 to be evaluated into the evaluation unit 600;

[0067] (2) Open the first valve 1 and the second valve 4, keep the other valves closed, start the intake 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 the set value, open all valves except the upper vent valve 5 of the gas storage tank 16, and start the booster compressor 7;

[0069] (4) Detect whether the evaluation system can work properly, including the tightness of the pipeline, the adjustment ability of the booster compressor 7 for boosting, whether the air cooler 3 and the heat exchanger 9 can achieve the heat exchange effect, whether the valves can be opened and closed normally, whether the instruments are accurate, etc.;

[0070] (5) Adjust the intake compressor 2 and the booster compressor 7 to gradually stabilize the experimental conditions and reach the set experimental conditions, and record the pressure before and after the JT valve 12 to be evaluated at this time, as well as the gas flow rate;

[0071] (6) Check the readings on the thermometer 11 before the valve and the thermometer 13 after the valve, and record the temperatures of the gas before and after the JT valve 12 to be evaluated under the corresponding conditions;

[0072] (7) After the experiment, first close the intake compressor 2 and the booster compressor 7, then close the first valve 1 in front of the intake compressor 2, slowly open the vent valve 5, wait until the pressure gauge 17 supporting the gas storage tank shows that the internal pressure has dropped to normal pressure, close the vent valve 5, and finally close all the remaining valves on the pipeline, and take out the JT valve 12 to be evaluated from the evaluation unit 600;

[0073] (8) The experiment ends.

[0074] Solution 2

[0075] The present invention provides a JT valve refrigeration effect evaluation device, which is applied to the above JT valve refrigeration effect evaluation method, as Figure 1As shown in the figure, 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 thermometer 11 before the valve, and a thermometer 13 after the valve. The heat exchanger 9, the thermometer 11 before the valve, and the thermometer 13 after the valve are connected in series to the evaluation pipeline 60. A detection interface for connecting the J-T valve 12 to be evaluated is provided between the thermometer 11 before the valve and the thermometer 13 after the valve. Moreover, the thermometer 11 before the valve is located before the detection interface and after the heat exchanger 9; the pressure gas supply device 100 is connected to the evaluation pipeline 60 to supply 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 to the inlet of the heat exchange pipeline 91.

[0076] Install the J-T valve 12 to be evaluated at 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. This J-T valve refrigeration effect evaluation device has all or at least part of the technical features and technical effects of the above J-T valve refrigeration effect evaluation method, which will not be elaborated here.

[0077] In an embodiment of the present invention, the pressure gas supply device 100 includes a gas supply pipeline 21, an intake compressor 2, a gas storage 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 storage tank 16 are connected in series to the gas supply pipeline 21 in sequence. The first valve 1 is provided before the intake compressor 2, and the second valve 4 is provided between the air cooler 3 and the gas storage tank 16; the booster compressor 7 is connected in series after the gas storage tank 16. The intake compressor 2 transports external gas into the gas storage tank 16 and makes the internal pressure of the gas storage 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 storage tank 16 plays a buffering role to ensure that there is sufficient gas source for the subsequent evaluation process. The booster compressor 7 raises the internal gas pressure of the gas storage tank 16 again to reach the corresponding pressure condition, ensuring that the gas has sufficient pressure energy to generate the Joule-Thomson effect, reducing the gas temperature, and ensuring the smooth implementation of the experiment.

[0078] The J-T valve refrigeration effect evaluation device provided by the present invention can be applied to the refrigeration process of oil and gas field stations, 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 each oil and gas field, showing stronger adaptability.

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

Claims

1. A method for evaluating the refrigeration effect of a JT valve, It is characterized in that The JT valve refrigeration effect evaluation system used includes: Pressurized gas supply device; An evaluation unit, comprising an evaluation pipeline, a heat exchanger, a JT valve to be evaluated, a pre-valve thermometer, a post-valve thermometer, a first pre-valve pressure gauge, and a post-valve pressure gauge, wherein the heat exchanger and the JT valve to be evaluated are connected in series to the evaluation pipeline, the pre-valve thermometer and the post-valve thermometer are connected to the evaluation pipeline and are respectively located before and after the JT valve to be evaluated, the first pre-valve pressure gauge and the post-valve pressure gauge are connected to the evaluation pipeline and are respectively located before and after the JT valve to be evaluated, and the pre-valve thermometer is located before the JT 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; the heat exchanger includes a heat exchange pipeline, and the outlet of the evaluation pipeline is connected to the inlet of the heat exchange pipeline; The JT valve refrigeration effect evaluation method includes: Step S10, the pressure gas supply device delivers pressure gas to the evaluation pipeline; Step S20, the pressurized gas flows through the heat exchanger and the JT valve to be evaluated in sequence, the valve-front thermometer and the valve-back thermometer respectively detect the temperatures before and after the JT valve to be evaluated, and the first valve-front pressure gauge and the valve-back pressure gauge respectively detect the pressures before and after the JT valve to be evaluated; Step S30 , the gas flowing out of the evaluation pipeline flows into the heat exchanger through the heat exchange pipeline, and performs heat exchange with the pressurized gas flowing toward the JT valve to be evaluated.

2. The JT valve refrigeration effect evaluation method according to claim 1, It is characterized in that The JT valve refrigeration effect evaluation system includes a second pre-valve pressure gauge connected to the evaluation pipeline, the post-valve pressure gauge is located after the post-valve thermometer, the first pre-valve pressure gauge is located after the pre-valve thermometer, and the second pre-valve pressure gauge is located before the heat exchanger.

3. The JT valve refrigeration effect evaluation method according to claim 2, It is characterized in that The JT valve refrigeration effect evaluation system includes a flow meter, which is arranged between the heat exchanger and the pre-valve thermometer.

4. The JT valve refrigeration effect evaluation method according to claim 3, It is characterized in that The JT valve refrigeration effect evaluation method includes: Calculate the pressure drop by using the detection values ​​of the first pressure gauge before the valve and the pressure gauge after the valve; The refrigeration effect is characterized by the detection value of the thermometer before the valve and the detection value of the thermometer after the valve; A relationship between the refrigeration effect, the pressure drop and the flow value detected by the flow meter is established.

5. The JT valve refrigeration effect evaluation method according to claim 1, It is characterized in that The pressurized gas supply device includes an air supply pipeline, an air intake compressor, an air storage tank, an air cooler, a valve No. 1 and a valve No.

2. The air intake compressor, the air cooler and the air storage tank are connected in series to the air supply pipeline in sequence. The valve No. 1 is arranged before the air intake compressor, and the valve No. 2 is arranged between the air cooler and the air storage tank.

6. The JT valve refrigeration effect evaluation method according to claim 5, It is characterized in that The air cooler comprises an air cooling pipeline, a plurality of variable frequency fans and a plurality of industrial frequency fans, and the variable frequency fans and the industrial frequency fans are used to blow air to the air cooling pipeline respectively.

7. The JT valve refrigeration effect evaluation method according to claim 5, It is characterized in that The pressure gas supply device comprises a booster compressor, and the booster compressor is connected in series after the gas storage tank.

8. The JT valve refrigeration effect evaluation method according to claim 7, It is characterized in that The compression ratio of the intake compressor and the boost compressor is adjusted to keep the gas pressure inside the gas storage tank stable.

9. A JT valve refrigeration effect evaluation device, It is characterized in that A JT valve refrigeration effect evaluation method applied to any one of claims 1 to 8, wherein the JT valve refrigeration effect evaluation device comprises: a pressure gas supply device and an evaluation module, wherein the evaluation module comprises an evaluation pipeline, a heat exchanger, a pre-valve thermometer and a post-valve thermometer, wherein 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 the JT valve to be evaluated is provided between the first pre-valve pressure gauge and the post-valve thermometer, and the pre-valve thermometer 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; the heat exchanger includes a heat exchange pipeline, and the outlet of the evaluation pipeline is connected to the inlet of the heat exchange pipeline.

10. The JT valve refrigeration effect evaluation device according to claim 9, It is characterized in that The pressurized gas supply device includes an air supply pipeline, an air intake compressor, an air storage tank, an air cooler, a No. 1 valve, a No. 2 valve and a booster compressor. The air intake compressor, the air cooler and the air storage tank are connected in series to the air supply pipeline in sequence. The No. 1 valve is arranged before the air intake compressor, and the No. 2 valve is arranged between the air cooler and the air storage tank; the booster compressor is connected in series after the air storage tank.

Images