Incoming flow gas temperature and pressure regulating system

Abstract

The utility model discloses an incoming flow gas temperature and pressure regulating system which comprises a vortex tube, a heat exchanger and a gas mixing mechanism. The incoming flow gas pipeline is communicated with a gas inlet of the vortex tube, a cold end outlet of the vortex tube is used for being communicated with an inlet of a heat exchanger, and a hot end outlet of the vortex tube is used for being communicated with a first flow inlet of a gas mixing mechanism; an outlet of the heat exchanger communicates with a second flow inlet of the gas mixing mechanism, after high-temperature and high-pressure incoming flow gas is separated through the vortex tube, low-temperature gas is obtained at a cold end outlet of the vortex tube, and the low-temperature gas enters the gas mixing mechanism after being heated through the heat exchanger; high-temperature gas is obtained at a hot end outlet of the vortex tube and enters the gas mixing mechanism, and low-pressure medium-temperature gas is obtained at an exhaust port of the gas mixing mechanism. High-pressure gas directly drives the vortex tube, cold end outlet low-pressure low-temperature gas and the inlet and outlet pressure ratio of the vortex tube are larger, and therefore the temperature of the cold end outlet of the vortex tube is lower, and the larger the temperature difference between the cold side and the hot side in the heat exchanger is, the higher the heat exchange efficiency of the heat exchanger is.

Description

Technical Field

[0001] The utility model belongs to the field of natural gas pressure regulation, and specifically relates to a natural gas temperature regulation and pressure reduction system using a vortex tube, which is used to reduce the pressure of high-pressure natural gas to a low-pressure state allowed by the urban pipeline network for users to use. Background Art

[0002] A vortex tube is a mechanical device mainly used to divide high-pressure gas into cold flow and hot flow, and the two flows flow out from both ends respectively. When in use, the operation of the vortex tube starts from a high-speed rotating air flow. When compressed gas enters the vortex tube, it is injected into the vortex chamber tangentially through a specially designed nozzle to form a free vortex.

[0003] In the prior art, vortex tubes are used in natural gas temperature regulation and pressure reduction equipment. Since increasing the gas pressure can reduce transportation costs, the designed pressure of pipeline natural gas processed by the treatment plant and transported to the urban gate station is usually about 3 MPa. However, the natural gas used by users is in a low-pressure state. Therefore, before final use, it is necessary to reduce the pressure in the urban gate station, and the natural gas pressure needs to be reduced to 0.1 - 0.4 MPa before it can enter the urban pipeline. However, during the throttling and pressure reduction process of high-pressure natural gas, the temperature will rapidly decrease due to the Joule-Thomson effect. If heat is not replenished in time, it will cause frosting or even ice blockage of the pipeline. Therefore, it is necessary to heat the natural gas before pressure regulation so that its temperature will not drop below the freezing point after throttling and pressure reduction. Commonly used heating devices include electric heating and gas boiler heating, and both of these heating methods require a large amount of energy consumption.

[0004] CN107965667B discloses a pipeline natural gas pressure regulating system that utilizes the self-pressure of a pipeline to achieve low-temperature air heat extraction. In this system, a vortex tube is used in the field of pipeline natural gas pressure regulation. The pressure-driven heating and pressure regulating unit consists of a vortex tube, an air-cooled heat exchanger, and an ejector. Among them, the inlet of the ejector is connected to the incoming PNG, and the outlet of the ejector is connected to the inlet of the vortex tube; the cold end of the vortex tube is connected to the inlet of the air-cooled heat exchanger, and the outlet of the air-cooled heat exchanger is connected to the inlet of the ejector; the hot end of the vortex tube is connected to the pressure regulating device. By means of the pressure drive of the ejector, the natural gas circulates in the ejector, the outlet of the cold end of the vortex tube, and the air-cooled heater to recover the pressure energy of the incoming PNG. In this prior application, the high-pressure gas first enters the ejector, entraining the low-pressure gas and mixing to form medium-pressure gas, which then enters the vortex tube. The medium-pressure gas entering the vortex tube is separated by the energy of the vortex tube, and the low-pressure and low-temperature gas is discharged from the cold end. After absorbing heat from the environment in the heat exchanger, it enters the ejector entrainment port and mixes with the mainstream. The low-pressure and high-temperature gas is discharged from the hot end outlet. The ejector is used as a pressure-driven entrainment and boosting device, and it needs to entrain the low-pressure gas from the outlet of the cold end of the vortex tube and passing through the heat exchanger. The two gases need to be mixed and boosted in the ejector. The medium-pressure gas passing through the ejector enters the vortex tube, and the low-pressure and low-temperature gas at the cold end outlet enters the heat exchanger to absorb heat.

[0005] However, in the above-mentioned prior application, both the ejector and the vortex tube desire higher pressure drive. The high pressure at the inlet of the vortex tube means an increase in the pressure at the outlet of the ejector. For the ejector, once the outlet pressure increases, its entrainment performance will be greatly reduced. If the entrainment performance of the ejector is guaranteed, the pressure at the inlet of the vortex tube will decrease, resulting in a reduction in the energy separation performance of the vortex tube and a deterioration of the system performance. This mutually contradictory problem makes it impossible to meet the requirements of the system outlet. Utility Model Content

[0006] In view of the above problems, the present utility model provides a temperature and pressure regulating system for incoming gas. The technical solution adopted by the present utility model to solve the technical problems is as follows: It includes a vortex tube, a heat exchanger, and a gas mixing mechanism;

[0007] The incoming gas pipeline is communicated with the air inlet of the vortex tube. The cold end outlet of the vortex tube is used to communicate with the inlet of the heat exchanger, and the hot end outlet of the vortex tube is used to communicate with the first gas inlet of the gas mixing mechanism; the outlet of the heat exchanger is communicated with the second gas inlet of the gas mixing mechanism.

[0008] Among them, after the high-temperature and high-pressure incoming gas is separated by the vortex tube, low-temperature gas is obtained at the cold end outlet of the vortex tube. The low-temperature gas enters the gas mixing mechanism after being heated by the heat exchanger; high-temperature gas is obtained at the hot end outlet of the vortex tube and this high-temperature gas enters the gas mixing mechanism. Low-pressure and medium-temperature gas is obtained at the outlet of the gas mixing mechanism.

[0009] A temperature and pressure regulating system for incoming gas is also proposed, which includes a vortex tube, a heat exchanger, a four-way valve, and a gas mixing mechanism;

[0010] The incoming gas pipeline is connected to the inlet of the vortex tube. The cold end outlet of the vortex tube is used to connect to the second interface of the four-way valve. The inlet of the heat exchanger is used to communicate with the third interface of the four-way valve. The hot end outlet of the vortex tube is used to connect to the first interface of the four-way valve. The first flow inlet of the gas mixing mechanism is connected to the fourth interface of the four-way valve. The outlet of the heat exchanger is connected to the second flow inlet of the gas mixing mechanism;

[0011] Among them, in the first working position of the four-way valve, the high-temperature and high-pressure incoming gas is separated by the vortex tube. A low-temperature gas is obtained at the cold end outlet of the vortex tube. The low-temperature gas enters the heat exchanger through the second interface and the third interface of the four-way valve, is heated up and then enters the second flow inlet of the gas mixing mechanism. A high-temperature gas is obtained at the hot end outlet of the vortex tube, and this high-temperature gas enters the first flow inlet of the gas mixing mechanism through the first interface and the fourth interface of the four-way valve. A low-pressure medium-temperature gas is obtained at the outlet of the gas mixing mechanism;

[0012] In the second working position of the four-way valve, the high-temperature and high-pressure incoming gas is separated by the vortex tube. A low-temperature gas is obtained at the cold end outlet of the vortex tube. The low-temperature gas enters the first flow inlet of the gas mixing mechanism after passing through the second interface and the fourth interface of the four-way valve. A high-temperature gas is obtained at the hot end outlet of the vortex tube, and this high-temperature gas enters the heat exchanger through the first interface and the third interface of the four-way valve, heats the heat exchanger, and then enters the second flow inlet of the gas mixing mechanism and is mixed at the gas mixing mechanism.

[0013] Preferably, the gas mixing mechanism is an ejector, which has a main flow inlet, an entrained flow port, and an outlet. Among them, the main flow inlet is the first flow inlet, and the entrained flow port is the second flow inlet.

[0014] Preferably, it has a vortex chamber, an inlet nozzle, a cold end tube, and a hot end tube that are all connected to the vortex chamber. It further includes:

[0015] An inlet drive structure, which cooperates with the inlet nozzle to adjust the flow rate of the inlet nozzle according to the pressure of the incoming gas;

[0016] A hot end self-regulating component, which is used to adjust the flow rate at the hot end outlet of the vortex tube according to the temperature of the incoming gas.

[0017] The beneficial effects of the present utility model will be described in detail in specific embodiments. Description of the Drawings

[0018] To more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present utility model and should not be regarded as a limitation of the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0019] Figure 1 It is a schematic diagram of the working principle of a vortex tube in the prior art.

[0020] Figure 2 It is a schematic diagram of the inlet self-regulating structure of the self-regulating vortex tube of the present utility model for coping with changes in oncoming flow parameters in response to changes in oncoming flow pressure.

[0021] Figure 3 It is a schematic diagram of the inlet self-regulating structure of the self-regulating vortex tube of the present utility model for coping with changes in oncoming flow parameters in response to changes in oncoming flow temperature.

[0022] Figure 4 It is a three-dimensional schematic diagram of the inlet self-regulating structure of the present utility model for coping with changes in oncoming flow pressure.

[0023] Figure 5 It is Figure 4 a side view.

[0024] Figure 6 It is Figure 5 the sectional view A-A of

[0025] Figure 7 It is the first technical solution of the oncoming flow gas temperature and pressure regulating system of the present utility model.

[0026] Figure 8 It is the second technical solution of the oncoming flow gas temperature and pressure regulating system of the present utility model.

[0027] Figure 9 It is the third technical solution of the oncoming flow gas temperature and pressure regulating system of the present utility model.

[0028] Figure 10 It is a graph of the entrainment ratio of an ejector versus the main inlet pressure.

[0029] Figure 11 It is a graph of the temperature difference at the outlet of the vortex tube versus the inlet pressure.

[0030] Reference numerals: 1: nozzle; 2: vortex chamber; 3: cold end pipe; 4: hot end pipe; 5: regulating valve; 6: temperature conduction module; 7: bimetallic structure; 8: cylinder; 9: heat exchanger; 10: inlet drive structure; 11: inlet nozzle; 12: first control ring; 13: second control ring; 14: adjustment block; 15: control pull rod; 16: control valve plate; 17: nozzle; 18: valve seat; 19: drive block; 20: gas mixing structure; 21: first interface; 22: second interface; 23: third interface; 24: fourth interface. Detailed implementation manners

[0031] In order to more clearly understand the above objects, features and advantages of the present utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific implementation manners.

[0032] In the following description, many specific details are set forth in order to fully understand the present utility model. However, the present utility model may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present utility model is not limited by the specific embodiments disclosed below.

[0033] It should be noted that the descriptions involving "first", "second", etc. in this application are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between various embodiments may be combined with each other, but it must be based on the fact that those skilled in the art can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by this application.

[0034] Embodiment 1:

[0035] Refer to Figure 7 , a flow gas temperature and pressure regulating system is proposed, including a vortex tube, a heat exchanger and a gas mixing mechanism; the incoming gas pipeline is communicated with the inlet of the vortex tube, the cold end outlet of the vortex tube is used to communicate with the inlet of the heat exchanger, and the hot end outlet of the vortex tube is used to communicate with the first flow inlet of the gas mixing mechanism; the outlet of the heat exchanger is communicated with the second flow inlet of the gas mixing mechanism. Among them, the high-temperature and high-pressure incoming gas is separated by the vortex tube, and a low-temperature gas is obtained at the cold end outlet of the vortex tube. The low-temperature gas enters the gas mixing mechanism after being heated by the heat exchanger; a high-temperature gas is obtained at the hot end outlet of the vortex tube and the high-temperature gas enters the gas mixing mechanism, and a low-pressure and medium-temperature gas is obtained at the outlet of the gas mixing mechanism.

[0036] Among them, the heat exchanger is a prior art and can be a shell-and-tube heat exchanger, a plate heat exchanger, a double-pipe heat exchanger, a finned heat exchanger, etc. In this embodiment, the heat exchanger is used to obtain heat from the environment, such as obtaining heat from the air to increase the temperature of the cold fluid.

[0037] In this embodiment, the technical features of high-temperature gas, medium-temperature gas, and low-temperature gas are relative comparisons among the three in the same system.

[0038] In this embodiment, after the high-pressure normal-temperature gas enters the vortex tube, due to its energy separation effect, a gas with a lower temperature than the inlet temperature is discharged from the cold-end outlet of the vortex tube, and a gas with a higher temperature than the inlet temperature is discharged from the hot-end outlet. The high-temperature gas enters the gas mixing structure, and the low-temperature gas enters the heat exchanger to absorb heat from the environment and then enters the gas mixing structure. The two fluids are mixed in the gas mixing structure and then discharged for use as a medium-temperature low-pressure gas. Thus, this system can achieve heat extraction from the normal-temperature environment by the normal-temperature high-pressure gas to obtain a low-pressure medium-temperature gas.

[0039] In a pipeline natural gas pressure regulating system for low-temperature air heat extraction using the self-pressure of the pipeline in CN107965667B, the medium-pressure gas passing through the ejector enters the vortex tube, and the low-pressure low-temperature gas at the cold-end outlet enters the heat exchanger to absorb heat. Compared with the prior art, in this embodiment, the high-pressure gas directly drives the vortex tube, and the pressure ratio at the inlet and outlet of the vortex tube is larger for the low-pressure low-temperature gas at the cold-end outlet. Therefore, the temperature at the cold-end outlet is lower. In the heat exchanger, the greater the temperature difference between the hot and cold sides, the higher the heat transfer efficiency of the heat exchanger, and the entire system only needs to meet the inlet pressure of the vortex tube. At this time, the energy separation performance of the vortex tube can be ensured.

[0040] Experimental results:

[0041] In the experimental verification, nitrogen with a pressure of 3 MPa was used to simulate the high-pressure gas flow, and the temperature after direct throttling of nitrogen was compared with the outlet temperature after passing through the Figure 2 system. The experimental results are shown in the following table. The outlet temperature after direct throttling of the high-pressure gas with an inlet temperature of 23.1°C was 8.9°C, and the temperature decreased by 14.2°C; after passing through the Figure 2 system, the high-pressure gas with a pressure of 3 MPa and a temperature of 15.6°C first entered the vortex tube for energy separation. The cold-end outlet temperature was -11.8°C, and the hot-end outlet temperature was 46°C. The two fluids were mixed through an ejector (or other mixing devices), and the mixed temperature was 26°C. The temperature increased by 10.4°C compared with the inlet temperature. Heat extraction from the environment was achieved with temperature rise on the basis of overcoming the Joule-Thomson effect.

[0042]

[0043] Embodiment 2:

[0044] In Figure 8 Figure 8 , a temperature and pressure regulating system for incoming gas is proposed, including a vortex tube, a heat exchanger, a four-way valve, and a gas mixing mechanism; the incoming gas pipeline is connected to the inlet of the vortex tube, the cold-end outlet of the vortex tube is used to connect to the second interface 22 of the four-way valve, the inlet of the heat exchanger is used to communicate with the third interface 23 of the four-way valve, the hot-end outlet of the vortex tube is used to connect to the first interface 21 of the four-way valve, and the first gas inlet of the gas mixing mechanism is connected to the fourth interface 24 of the four-way valve; the outlet of the heat exchanger is connected to the second gas inlet of the gas mixing mechanism.

[0045] Among them, when the four-way valve is in the first operating position, the high-temperature and high-pressure incoming gas is separated by the vortex tube, and low-temperature gas is obtained at the cold-end outlet of the vortex tube. The low-temperature gas enters the heat exchanger through the second interface 22 and the third interface 23 of the four-way valve, is heated up and then enters the second gas inlet of the gas mixing mechanism; high-temperature gas is obtained at the hot-end outlet of the vortex tube, and the high-temperature gas enters the first gas inlet of the gas mixing mechanism through the first interface 21 and the fourth interface 24 of the four-way valve, and low-pressure medium-temperature gas is obtained at the outlet of the gas mixing mechanism.

[0046] When the four-way valve is in the second operating position, the high-temperature and high-pressure incoming gas is separated by the vortex tube, and low-temperature gas is obtained at the cold-end outlet of the vortex tube. The low-temperature gas enters the first gas inlet of the gas mixing mechanism after passing through the second interface 22 and the fourth interface 24 of the four-way valve; high-temperature gas is obtained at the hot-end outlet of the vortex tube, and the high-temperature gas enters the heat exchanger through the first interface 21 and the third interface 23 of the four-way valve, heats the heat exchanger, and then enters the second gas inlet of the gas mixing mechanism and mixes at the gas mixing mechanism.

[0047] In this embodiment, the system mainly consists of a vortex tube, an ejector, an air heat exchanger, and a four-way reversing valve, as Figure 8 shown. High-pressure natural gas is separated into two low-pressure natural gas streams, cold / hot, by the vortex tube. When the system is operating normally, high-temperature gas is obtained at the hot-end outlet of the vortex tube, and the high-temperature gas enters the first gas inlet of the gas mixing mechanism through the first interface 21 and the fourth interface 24 of the four-way valve. The low-temperature gas enters the heat exchanger through the second interface 22 and the third interface 23 of the four-way valve, is heated up and then enters the second gas inlet of the gas mixing mechanism; the two natural gas streams are mixed and finally flow out to form low-pressure medium-temperature natural gas.

[0048] When the gas mixing mechanism is an ejector, the ejector can effectively reduce the pressure of the gas at the injection port, that is, the back pressure at the cold-end outlet of the vortex tube, thereby improving the energy separation performance of the vortex tube, further enhancing the heat transfer capacity of the heat exchanger, and finally increasing the temperature of the natural gas at the outlet of the system, effectively solving the problems of pipeline frosting or ice blockage.

[0049] In addition, considering the relatively low ambient temperature in winter, frosting may occur on the outer surface of the heat exchanger. Therefore, a four-way reversing valve is designed to achieve heat flow defrosting. That is, when the system is defrosting and in the second operating condition position of the four-way valve, the high-temperature natural gas at the hot end outlet of the vortex tube first enters the heat exchanger for defrosting and then enters the ejector along the pipeline, while the low-temperature natural gas at the cold end outlet directly enters the ejector along the pipeline.

[0050] Embodiment 3:

[0051] In this embodiment, the gas mixing mechanism is an ejector, which has a primary flow inlet, an entrained flow port, and a discharge port. Among them, the primary flow inlet is the first flow inlet, and the entrained flow port is the second flow inlet.

[0052] Compared with the prior art, in a pipeline natural gas pressure regulating system for low-temperature air heat extraction using the pipeline's own pressure in CN107965667B, the ejector is used as a pressure-driven entrainment and boosting device, and it is required to entrain the low-pressure gas from the cold end outlet of the vortex tube and passing through the heat exchanger. The two gases need to be mixed and boosted in the ejector. In the system of this embodiment, the ejector is only used for mixing the high-temperature gas from the hot end outlet of the vortex tube and the normal-temperature gas from the cold end outlet of the vortex tube passing through the heat exchanger, and no boosting is required. Here, the ejector can be replaced by other mixing devices, not limited to the ejector. The system of this embodiment only needs to meet the inlet pressure of the vortex tube, and at this time, the energy separation performance of the vortex tube can be ensured. The ejector is only used for mixing the two gases and has relatively low requirements for the inlet pressure.

[0053] Embodiment 4:

[0054] In this embodiment, referring to Figure 9 , when the incoming flow is low-temperature and low-pressure gas and it hopes to absorb heat from the environment through a heat exchanger (air heat exchanger), usually due to the small heat transfer temperature difference, a heat exchanger with a larger heat transfer area is required, resulting in a waste of space. Therefore, this solution is proposed. The low-pressure and low-temperature gas is first pressurized by a booster pump to become high-pressure and low-temperature gas. After the high-pressure and low-temperature gas enters the vortex tube, due to its energy separation effect, the gas discharged from the cold end outlet is colder than the inlet temperature. The colder gas enters the heat exchanger to absorb heat from the environment. At this time, due to the increased temperature difference between the gas and the environment and the reduced flow rate of the colder gas (the other part of the gas is discharged from the hot end), a smaller heat transfer area of the heat exchanger is required; the gas discharged from the hot end outlet is hotter than the inlet temperature. The high-temperature gas enters the mainstream of the ejector, and the gas passing through the heat exchanger enters the entrained port of the ejector. The two fluids are mixed in the ejector to form a medium-temperature and low-pressure gas and then discharged for use. Thus, this solution can achieve heat extraction from the normal-temperature environment by the high-pressure and low-temperature gas, achieving a more efficient heat extraction effect of the low-pressure and low-temperature gas from the environment.

[0055] Embodiment 5:

[0056] In this embodiment, in addition to the content of the foregoing embodiment, a vortex tube with adjustable parameters is adopted, which has a vortex chamber, an inlet nozzle, a cold end tube, and a hot end tube all communicating with the vortex chamber, and further includes: an inlet transmission structure, which cooperates with the inlet nozzle and is used to adjust the flow rate of the inlet nozzle according to the pressure of the incoming gas; a hot end self-adjusting component, which is used to adjust the flow rate at the hot end outlet of the vortex tube according to the temperature of the incoming gas and the temperature at the hot end outlet of the vortex tube.

[0057] As Figure 2 shown, a self-adjusting vortex tube for coping with changes in incoming flow parameters is proposed. The vortex tube has a vortex chamber, an inlet nozzle 11, a cold end tube 3, and a hot end tube 4 all communicating with the vortex chamber, and further includes: on the basis of the main structure of the vortex tube, a piston-type cylinder and an inlet transmission structure are newly added, that is Figure 2 the inlet transmission structure 10 in

[0058] which includes a cylinder 8 and a ring structure driven to rotate by the cylinder; the main incoming flow pipeline is connected to the inlet nozzle 11, the branch incoming flow pipeline communicates with the rodless cavity of the cylinder 8, and the piston rod of the cylinder 8 is drivingly connected to the ring structure;

[0059] A control valve plate 16 is located between the valve seat 18 and the nozzle 17. The control valve plate 16 can adjust the opening of the nozzle 17 under the drive of the ring structure and control the flow rate of the incoming flow in the inlet nozzle 11; when the incoming flow pressure increases, part of the incoming flow gas enters the rodless cavity of the cylinder through the branch incoming flow pipeline, and the piston rod of the cylinder 8 drives the ring structure to rotate and expands the flow area of the inlet nozzle 11 by rotating the control valve plate 16, automatically adapting to the higher inlet pressure and flow rate.

[0060] Adapting to the change in the incoming flow pressure at the inlet is an important contribution of this embodiment. The self-regulating vortex tube cylinder can accurately adjust the valve opening of the nozzle 17 by sensing the change in the pressure of the incoming fluid, thereby achieving more precise flow rate and pressure control. The adaptive adjustment structure allows the system to automatically compensate for deviations according to the actual situation, ensuring that the controlled parameters are maintained within the set range, thus improving the control accuracy of the entire system. Moreover, it does not require an additional control unit or energy-consuming control components such as a controller, enhancing the reliability of the system operation. The adaptive adjustment structure driven by the cylinder reduces the need for manual intervention. The operator only needs to set the parameters, and the remaining adjustment work is automatically completed by the system.

[0061] The cylinder-driven adaptive adjustment structure of the self-regulating vortex tube can quickly respond to fluid pressure fluctuations, stabilize the output by adjusting the valve opening, and reduce the oscillation and overshoot phenomena of the system. Moreover, the cylinder can adapt to harsh environments such as high temperature, high pressure, and corrosive media, ensuring the normal operation of the valve under these conditions. This structure helps to maintain the stable operation of the production line.

[0062] See Figure 4 , Figure 5 , it further includes: the ring structure is coaxially installed with the vortex tube, there is an adjustment block 14 on the ring structure, there is a driving block 19 on the side of the vortex chamber, the driving block 19 can control the rotation of the valve plate 16 relative to the valve seat 18, and the driving control rod 15 passes through the adjustment block 14 and is connected to the driving block 19.

[0063] In this embodiment, there are multiple inlet nozzles 11 which are evenly distributed circumferentially. The multiple inlet nozzles 11 can better accelerate the high-pressure incoming gas and form a high-speed swirling flow, creating conditions for energy separation. When the gas passes through the inlet nozzles 11, it will expand and accelerate rapidly, forming a strong swirling airflow. This swirling airflow generates an energy separation effect inside the vortex chamber, causing a temperature difference between the center and the outer edge of the gas.

[0064] The ring structure is used to synchronously control the valve openings of the multiple inlet nozzles 11, so it is selected to be coaxially installed with the self-regulating vortex tube. The gas pressure above the cylinder increases and squeezes the piston to move downward, thereby driving the outer ring of the inlet transmission device to rotate clockwise. There is a driving block 19 on the side of the vortex chamber. Figure 4The driving block 19 is arranged on the side end near the cold end pipe in the vortex chamber. The driving block 19 can control the rotation of the valve plate 16 relative to the valve seat 18. The driving control pull rod 15 passes through the adjusting block 14 and is connected to the driving block 19. When the gas pressure above the self-adjusting vortex tube cylinder increases and squeezes the piston to move downward, it drives the peripheral ring structure of the inlet transmission device to rotate clockwise. The ring structure then drives the driving block 19 to rotate by pushing the control pull rod 15, and the driving block 19 further rotates the control valve plate 16. Moreover, the rotation angles of multiple control valve plates 16 are the same, so the opening degrees of each nozzle 11 are also the same.

[0065] See Figure 4 , Figure 5 , the ring structure includes a first control ring 12 and a second control ring 13. The adjusting block 14 is rotatably arranged between the first control ring 12 and the second control ring 13. The hole of the adjusting block 14 is slidably connected to the control pull rod 15. The driving block 19 includes a sleeve and a shaft on the outer side of the sleeve. The sleeve is fixedly connected to the control pull rod 15, and the shaft passes through the side of the vortex chamber and is fixedly connected to the control valve plate 16.

[0066] When the ring structure rotates and pushes the control pull rod 15, due to the change in position of the control pull rod 15, its relative position with the adjusting block 14 also changes, and a sliding displacement occurs between the control pull rod 15 and the hole of the adjusting block 14. This sliding fit between the hole and the shaft can prevent movement interference between transmission components.

[0067] It also includes a reset element, which can keep the control valve plate 16 at the preset opening degree of the nozzle 17 or restore it to the preset opening degree of the nozzle 17.

[0068] The reset element is a prior art. For example, a spring is sleeved on the piston rod of the cylinder. When the incoming flow pressure returns to the preset value, the piston of the cylinder can return to the preset position under the action of the spring. That is, the entire self-adjusting vortex tube is reset.

[0069] It also includes a hot end self-adjusting component, and further includes a temperature conduction module, a bimetallic structure 7 and a linkage lever. The temperature conduction module can transfer heat to the bimetallic structure 7 and is respectively connected to the incoming flow main pipeline and the hot end outlet of the vortex tube. When the bimetallic structure 7 changes its shape according to the temperature change, it drives the linkage lever to move. The linkage lever is connected to the regulating valve 5, and the regulating valve 5 can move axially along the hot end pipe 4 and adjust the opening degree of the hot end outlet of the vortex tube.

[0070] The hot end self-adjusting component is used to control the hot end control valve according to the temperature of the incoming flow gas to adjust the hot end outlet area, so as to adjust the flow rate of the hot end outlet of the vortex tube, and further adjust the flow rate ratio between the hot and cold ends of the vortex tube.

[0071] The bimetallic structure is composed of two different metals. This composite structure can bring into play the respective advantages of the two metals and produce a synergistic effect, thereby improving the overall performance. In the temperature adaptive regulation system, the bimetallic structure is used in combination with the temperature conduction module, and it can respond to the change of the incoming flow temperature according to the temperature of the incoming main pipeline.

[0072] A preferred solution is that the temperature conduction module is a capillary tube, and the bimetallic structure 7 is a coiled bimetallic strip. The bimetallic strip can contract or expand according to the temperature change, thereby driving the linkage lever to rotate. In Figure 3 it, the capillary tube covers the surface of the bimetallic strip. One end is connected to the high-pressure incoming gas, and the other end is connected to the low-pressure gas at the hot end outlet of the vortex tube. The bimetallic strip is connected to the hot end regulating valve through the linkage lever. By means of the lever principle LAB>>LBC, the influence of the deformation of the bimetallic strip on the horizontal position of the hot end regulating valve is enlarged. When the incoming flow temperature is low, the temperature of the gas in the capillary tube drops, the bimetallic strip contracts when cooled, pulls the lever to rotate counterclockwise around point B, and drives the hot end regulating valve to move to the right, so that the outlet area of the hot end of the vortex tube is enlarged, the cold flow ratio decreases, the performance of the vortex tube is improved, and finally the temperature of the gas at the outlet of the vortex tube pressure reduction system rises. When the incoming flow temperature is high, the temperature of the gas in the capillary tube rises, the bimetallic strip expands when heated, pushes the lever to rotate clockwise around point B, and drives the hot end regulating valve to move to the left, so that the outlet area of the hot end of the vortex tube is reduced, the cold flow ratio increases, the performance of the vortex tube is reduced, and finally the temperature of the gas at the outlet of the vortex tube pressure reduction system drops. Thus, this device enables the vortex tube pressure reduction system to maintain a relatively stable gas outlet state at different incoming flow temperatures.

[0073] As the temperature conduction module, one end of the capillary tube is connected to the high-pressure incoming gas, and the other end is connected to the low-pressure gas at the hot end outlet of the vortex tube. Under the action of the pressure difference, the incoming gas continuously flows from the high-pressure end to the low-pressure end at the hot end outlet of the vortex tube. Therefore, the bimetallic strip can quickly respond to the change of the incoming flow temperature.

[0074] In this embodiment, it can cope with the fluctuations in the incoming pressure of pipeline natural gas caused by the differences in the actual number of operating pipeline lines due to different urban natural gas demands in each quarter. The fluctuations in the incoming pressure and temperature of the vortex tube are adaptively adjusted by the inlet drive structure and the hot end self-regulating component, so as to cope with the complex working conditions of different pressures and temperatures. This not only improves the control accuracy and stability of the system, but also simplifies the operation and maintenance, enhances the response speed and energy efficiency, and strengthens the reliability and adaptability of the system.

[0075] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; under the idea of the present invention, the technical features in the above embodiments or different embodiments can also be combined, and the steps can be implemented in any order, and there are many other variations in different aspects of the present invention as described above. For the sake of brevity, they are not provided in detail; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A system for regulating temperature and pressure of incoming gas, characterized in that: It includes a vortex tube, a heat exchanger and a gas mixing mechanism; The incoming gas pipeline is connected to the air inlet of the vortex tube, the cold end outlet of the vortex tube is used to communicate with the heat exchanger inlet, and the hot end outlet of the vortex tube is used to communicate with the first flow inlet of the mixing mechanism; the heat exchanger outlet is connected to the second flow inlet of the mixing mechanism, Among them, after the high-temperature and high-pressure incoming gas is separated by the vortex tube, low-temperature gas is obtained at the cold end outlet of the vortex tube. The low-temperature gas enters the gas mixing mechanism after being heated by the heat exchanger; high-temperature gas is obtained at the hot end outlet of the vortex tube and enters the gas mixing mechanism, and low-pressure and medium-temperature gas is obtained at the exhaust port of the gas mixing mechanism.

2. A system for regulating temperature and pressure of incoming gas, characterized in that: It includes a vortex tube, a heat exchanger, a four-way valve and a gas mixing mechanism; The incoming gas pipeline is connected to the air inlet of the vortex tube, the cold end outlet of the vortex tube is used to connect to the second interface (22) of the four-way valve, the heat exchanger inlet is used to communicate with the third interface (23) of the four-way valve, the hot end outlet of the vortex tube is used to communicate with the first interface (21) of the four-way valve, the first flow inlet of the mixing mechanism is connected to the fourth interface (24) of the four-way valve; the heat exchanger outlet is connected to the second flow inlet of the mixing mechanism; When the four-way valve is in the first working position, high-temperature and high-pressure incoming gas is separated by the vortex tube, and low-temperature gas is obtained at the cold end outlet of the vortex tube. The low-temperature gas enters the heat exchanger through the second interface (22) and the third interface (23) of the four-way valve to be heated, and then enters the second flow inlet of the gas mixing mechanism; high-temperature gas is obtained at the hot end outlet of the vortex tube and enters the first flow inlet of the gas mixing mechanism through the first interface (21) and the fourth interface (24) of the four-way valve, and low-pressure and medium-temperature gas is obtained at the outlet of the gas mixing mechanism; When the four-way valve is in the second working position, high-temperature and high-pressure incoming gas is separated by the vortex tube, and low-temperature gas is obtained at the cold end outlet of the vortex tube. The low-temperature gas enters the first flow inlet of the mixing mechanism after passing through the second interface (22) and the fourth interface (24) of the four-way valve; high-temperature gas is obtained at the hot end outlet of the vortex tube and enters the heat exchanger through the first interface (21) and the third interface (23) of the four-way valve to heat the heat exchanger, and then enters the second flow inlet of the mixing mechanism to be mixed in the mixing mechanism.

3. The incoming gas temperature and pressure regulating system according to claim 1 or 2, characterized in that: The gas mixing mechanism is an ejector, which has an active flow inlet, an ejection flow outlet and an exhaust outlet, wherein the active flow inlet is a first flow inlet and the ejection flow outlet is a second flow inlet.

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