Working medium filling device based on phase state control

Abstract

The utility model belongs to the technical field of gas filling, and particularly relates to a working medium filling device based on phase state control. Comprising a main pipeline used for conveying a working medium from a working medium source into a container to be filled with the working medium, and further comprises a temperature control module used for controlling the temperature of the working medium in the main pipeline through refrigerant circulation, the refrigerant end of the heat exchanger connected in series in the temperature control module serves as an evaporator for refrigerant circulation, and the working medium end of the heat exchanger is further connected to the position, located on the downstream of the pressurizing unit, of the main pipeline in series. The working medium filling device solves the technical problem that the working medium filling device in the prior art is poor in stability.

Description

TECHNICAL FIELD

[0001] The utility model belongs to gas filling technical field, concretely relates to a working medium filling device based on phase state control. BACKGROUND

[0002] With liquid carbon dioxide as working medium, carbon dioxide fracturing and blasting technology and carbon dioxide phase change ejection power technology using liquid carbon dioxide phase change expansion work are widely applied. In various carbon dioxide phase change devices, the carbon dioxide filling amount of the device has a significant influence on its phase change work performance. Currently, the carbon dioxide filling amount is usually obtained by direct weighing method. However, the carbon dioxide weighing equipment has high requirements for the filling environment. Since the weighing equipment relies on pressure sensor for measurement, it cannot accurately measure the filling amount on unstable planes such as non-horizontal ground or ship deck, and thus cannot accurately control the carbon dioxide phase change work performance. The flow meter has less influence on the filling environment for measuring the carbon dioxide filling amount. However, since the carbon dioxide is in gas-liquid mixed state in the filling pipeline, and the density of gas and liquid changes with temperature and pressure, the conventional volume flow meter and mass flow meter cannot accurately measure the carbon dioxide flow, and thus cannot accurately control the filling amount.

[0003] The Chinese invention patent application publication with the application publication number CN114165725A and the application publication date of March 11, 2022 discloses a supercritical working medium rapid filling and precise supply device and method. The device is provided with a booster pump, a Coriolis force flow meter and a back pressure valve on the main pipeline in sequence. The booster pump is controlled to pressurize the working medium until the pressure threshold of the back pressure valve is reached. At this time, the working medium is also in a supercritical state or liquid state. The working medium filling amount is measured by the Coriolis force flow meter. The Coriolis force flow meter measures the flow only related to the working medium mass and is not sensitive to the working medium density, so as to realize the precise supply of the working medium. However, the above technical solution has only the booster pump as a means for controlling the working medium state. On the one hand, the working medium needs to reach a relatively high pressure to be in a supercritical state or liquid state, which has a high requirement for the booster pump. On the other hand, when the maximum working pressure of the booster pump cannot make the working medium in a supercritical state or liquid state due to failure or other reasons, the device cannot work normally, resulting in poor stability of the device. In summary, the existing technology has the technical problem of poor stability of the working medium filling device. UTILITY MODEL CONTENT

[0004] The utility model aims to provide a working medium filling device based on phase state control to solve the technical problem of poor stability of the working medium filling device in the prior art.

[0005] In order to solve the above technical problems, the utility model provides a technical solution for a working fluid filling device based on phase control: a working fluid filling device based on phase control, comprising a main line for transporting the working fluid from a working fluid source to a container to be filled with the working fluid, the main line being provided with a boosting unit for controlling the working fluid pressure, and also comprising a temperature control module for controlling the working fluid temperature in the main line by adopting a refrigerant circulation, the refrigerant end of the heat exchanger connected in series in the temperature control module serving as an evaporator of the refrigerant circulation, and the working fluid end of the heat exchanger being further connected in series on the main line downstream of the boosting unit.

[0006] The beneficial effect of the above technical solution is that the technical solution of the working fluid filling device based on phase control of the present utility model is an improved invention. The present utility model adds a temperature control module to the existing technology for pressurizing the working fluid. The temperature control module controls the temperature of the working fluid in the main line. When the working fluid pressure does not meet the conditions, the working fluid can be liquidized through temperature control. This greatly reduces the pressure conditions required to liquidize the working fluid, thus reducing the requirements for the pressurization unit and significantly improving the stability of the filling device. The present utility model solves the technical problem of poor stability of the working fluid filling device in the existing technology.

[0007] Furthermore, the working medium end is a buffer tank.

[0008] Furthermore, the refrigerant end is a cooling pipeline, and the cooling pipeline surrounds the outer wall of the buffer tank multiple times.

[0009] Furthermore, the buffer tank is provided with a pressure sensor and a temperature sensor, and the pressure sensor and the temperature sensor are used to detect the pressure and temperature of the working medium in the buffer tank respectively.

[0010] Furthermore, a Coriolis flowmeter for detecting the flow of the working fluid is also provided on the main pipe.

[0011] Furthermore, a gas source shut-off valve for controlling the connection and disconnection between the main pipe and the working fluid source is provided on one end of the main pipe close to the working fluid source.

[0012] Furthermore, a filling stop valve for controlling the connection and disconnection between the container and the main line is provided at one end of the main line close to the container to be filled with the working medium.

[0013] Furthermore, it also includes an emptying branch; the emptying branch is provided with an emptying stop valve and an emptying one-way valve, and the emptying one-way valve is used to ensure that the fluid in the emptying branch can only flow out of the device.

[0014] Furthermore, the boosting unit is a pressurizing plunger pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1A schematic diagram of the boundary line between the gas and liquid phases of carbon dioxide in an embodiment of the working medium filling device based on phase control of the present invention;

[0016] Figure 2 It is a structural schematic diagram of an embodiment of a working fluid filling device based on phase control of the present utility model.

[0017] Among them, 1. Gas source; 2. Gas source shut-off valve; 3. Pressurized plunger pump; 4. Gas source check valve; 5. Refrigerant storage tank; 6. Buffer tank; 7. Temperature sensor; 8. Pressure sensor; 9. Flow meter shut-off valve; 10. Coriolis flowmeter; 11. Adjustable flow valve; 12. Charging check valve; 13. Charging tee; 14. Charging shut-off valve; 15. Emptying shut-off valve; 17. Radiator; 18. Compression pump; 19. Cooling pipeline; 20. Container. DETAILED DESCRIPTION

[0018] In the prior art, when filling a working fluid, the working fluid is kept in a liquid state only by controlling the pressure, resulting in poor stability of the filling device. The present invention, on the other hand, builds upon the prior art's work fluid pressurization by adding a temperature control module. This module controls the temperature of the working fluid in the main line, enabling the working fluid to reach a liquid state through temperature control when the working fluid pressure does not meet the required conditions. This significantly reduces the pressure required to achieve the liquid state, thereby lowering the requirements for the pressurization unit and significantly improving the stability of the filling device. The present invention solves the technical problem of poor stability of the working fluid filling device in the prior art.

[0019] Embodiment of working fluid filling device based on phase control:

[0020] This embodiment takes carbon dioxide as the working fluid to be filled as an example for detailed introduction. A working fluid filling device based on phase control, such as Figure 2 As shown, the device includes a main line (including an air intake line and a charging line), a buffer tank 6, a temperature control module, an emptying branch, a temperature sensor 7, a pressure sensor 8 and a control module.

[0021] One end of the intake line is connected to an air source 1 (i.e., the working fluid source), and the other end is connected to a buffer tank 6. The intake line includes an air source shutoff valve 2, a booster unit, and an air source check valve 4, which are connected in sequence. The check valve 4 restricts fluid flow to only from the booster unit to the buffer tank 6.

[0022] Specifically, in this embodiment, the pressurizing unit is a pressurizing plunger pump 3. In other embodiments, the pressurizing unit may adopt other pressurizing methods, such as a pneumatic gas booster pump.

[0023] The buffer tank 6 is mounted with a temperature sensor 7 and a pressure sensor 8 for measuring the temperature and pressure of the carbon dioxide in the buffer tube 6 respectively.

[0024] The temperature control module uses a refrigerant circulation method to control the working fluid temperature. The temperature control module includes a compression pump 18, a cooling line 19, a refrigerant storage tank 5, and a radiator 17. The outlet of the compression pump 18, the cooling line 19, the refrigerant storage tank 5, the radiator 17, and the inlet of the compression pump 18 are connected in sequence. The refrigerant storage tank 5 stores R22 refrigerant. The cooling line 19 and the radiator 17 respectively constitute the evaporator and condenser in the refrigerant circulation. The cooling line 19 is wrapped around the outer wall of the buffer tank 6 multiple times to allow the refrigerant in the cooling line 19 to exchange heat with the carbon dioxide in the buffer tank 6, thereby controlling the temperature of the carbon dioxide in the buffer tank 6. The cooling line 19 and the buffer tank 6 respectively constitute the refrigerant end and the working fluid end of the heat exchanger.

[0025] One end of the charging pipeline is connected to the buffer tank 6, and the other end is used to connect to the container 20. The charging pipeline includes a flow meter stop valve 9, a Coriolis flowmeter 10, an adjustable throttle valve 11, a charging check valve 12, a charging tee 13, and a charging stop valve 14. The charging stop valve 14, the Coriolis flowmeter 10, the adjustable throttle valve 11, the charging check valve 12, the charging tee 13, and the charging stop valve 14 are connected in sequence. The charging check valve 12 restricts the flow direction from the adjustable throttle valve 11 to the charging tee 13.

[0026] In other implementations, other types of flow meters may be selected to measure the filling amount of the working fluid according to different working fluids, or the filling amount of the working fluid may be obtained by directly weighing the container containing the working fluid without setting a flow meter.

[0027] The emptying branch is connected to the filling tee 13 and includes an emptying stop valve 15 and an emptying one-way valve 16. The emptying one-way valve 16 limits the flow direction from the emptying stop valve 12 to the outside of the device.

[0028] The control module receives input signals from the Coriolis flowmeter 10, the temperature sensor 7 and the pressure sensor 8, and outputs control signals to the gas source stop valve 2, the pressurized plunger pump 3, the flowmeter stop valve 9, the charging stop valve 14, the emptying stop valve 15 and the compression pump 18.

[0029] Carbon dioxide enters the air intake pipeline from the gas source 1, and enters the buffer tank 6 after being pressurized by the pressurized plunger pump 3. The gas source shut-off valve 2 in the air intake pipeline controls the connection and disconnection between the gas source 1 and the filling device. The gas source one-way valve 4 limits the flow direction from the pressurized plunger pump 3 to the buffer tank 6. The buffer tank 6 serves as a carbon dioxide storage tank for the filling device and reduces the pressure fluctuation amplitude when the pressurized plunger pump 3 is working and the connection state of the filling device pipeline changes.

[0030] Carbon dioxide enters the filling pipeline from the buffer tank 6, passes through the flow meter stop valve 9 and then passes through the Coriolis flow meter 10. After the Coriolis flow meter 10 is turned on, it can output the carbon dioxide flow to the control module. qm(g / s), the adjustable flow valve 11 can adjust the filling flow, and the filling check valve 12 limits the flow direction from the adjustable flow valve 11 to the filling three-way valve 13. The filling stop valve 14 controls the connection and disconnection between the filling pipeline and the phase change module 20.

[0031] The emptying stop valve 15 controls the opening and closing of the filling tee 13 and the emptying branch.

[0032] The refrigerant storage tank 5, compression pump 18, radiator 17, and cooling pipe 19 form a temperature regulation module, which cools the carbon dioxide in the buffer tank 6 according to the control signal output by the control module. The exhaust branch is connected to the filling tee 13 and includes an exhaust stop valve 15 and an exhaust check valve 16. The exhaust check valve 16 restricts the flow of air from the exhaust stop valve 15 to the outside of the device.

[0033] The working process of the phase-controlled working fluid filling device of this embodiment is purging, evacuation, pressurization and filling. Purging is to purge the air in the device pipeline with carbon dioxide before filling to reduce impurities filled into the container 20 and improve filling accuracy.

[0034] During the purging process, the control module opens the gas source stop valve 2 to introduce carbon dioxide, and at the same time opens the flow meter stop valve 9, the filling stop valve 14 and the pressurized plunger pump 4. After purging for 20 seconds, the gas source stop valve 2 and the pressurized plunger pump 4 are closed, and the emptying stop valve 15 is opened to carry out the emptying process. After the emptying branch no longer flows out of gas, the emptying process ends and the emptying stop valve 15 is closed.

[0035] When the pressurization process starts, only the gas source shut-off valve 2 is opened, and the pressurization plunger pump 3 and the compression pump 18 are started to cool down and pressurize the carbon dioxide in the buffer tank 6. The gas-liquid two-phase boundary data is obtained according to the physical property data of carbon dioxide, such as Figure 1 As shown, when the carbon dioxide temperature and pressure data measured by the temperature sensor 7 and the pressure sensor 8 determine that the carbon dioxide is below the gas-liquid phase line, the carbon dioxide in the buffer tank 6 is in the liquid phase, and the filling process can be started at this time.

[0036] The control module opens the flow meter stop valve 9 and the filling stop valve 14, and starts the Coriolis flowmeter 10 to measure the mass flow of liquid carbon dioxide. q m The control module calculates the carbon dioxide filling amount according to the following formula :

[0037]

[0038] During the filling process, the pressure plunger pump 3 and the compression pump 18 continue to work to keep the carbon dioxide in the device below the liquidus line. The filling speed can be adjusted by adjusting the adjustable flow valve 11. When the filling volume reaches the specified mass, the filling stop valve 14 is closed, and the pressure plunger pump 3 is turned off to stop filling.

[0039] The utility model has the following features:

[0040] The phase-controlled precise carbon dioxide filling device provided by the utility model has the function of measuring the carbon dioxide filling amount through the mass flow of liquid carbon dioxide, can achieve high terrain adaptability, high environmental adaptability and high-precision carbon dioxide filling, and provides a feasible solution for non-weighing filling of carbon dioxide phase change devices.

[0041] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments without inventive effort, or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A working fluid filling device based on phase control, comprising a main pipe for conveying working fluid from a working fluid source to a container to be filled with working fluid, wherein a boosting unit for controlling the working fluid pressure is provided on the main pipe, characterized in that: It also includes a temperature control module that uses a refrigerant circulation to control the working fluid temperature in the main line. The refrigerant end of the heat exchanger connected in series in the temperature control module serves as an evaporator of the refrigerant circulation, and the working fluid end of the heat exchanger is also connected in series on the main line downstream of the boosting unit.

2. The working fluid filling device based on phase control according to claim 1 is characterized in that: The working medium end is a buffer tank.

3. The working fluid filling device based on phase control according to claim 2, characterized in that: The refrigerant end is a cooling pipeline, and the cooling pipeline surrounds the outer wall of the buffer tank in multiple circles.

4. The working fluid filling device based on phase control according to claim 2 or 3, characterized in that: The buffer tank is provided with a pressure sensor and a temperature sensor, and the pressure sensor and the temperature sensor are used to detect the pressure and temperature of the working medium in the buffer tank respectively.

5. The working fluid filling device based on phase control according to claim 1, characterized in that: The main pipe is also provided with a Coriolis flowmeter for detecting the flow of the working fluid.

6. The working fluid filling device based on phase control according to claim 1, characterized in that: An air source shut-off valve for controlling the connection and disconnection between the main pipe and the working fluid source is provided on one end of the main pipe close to the working fluid source.

7. The working fluid filling device based on phase control according to claim 1, characterized in that: A filling stop valve for controlling the connection and disconnection between the container and the main line is provided on one end of the main line close to the container to be filled with the working medium.

8. The working fluid filling device based on phase control according to claim 1, characterized in that: It also includes an emptying branch; the emptying branch is provided with an emptying stop valve and an emptying one-way valve, and the emptying one-way valve allows the fluid in the emptying branch to only flow out of the device.

9. The working fluid filling device based on phase control according to claim 1, characterized in that: The boosting unit is a pressurizing plunger pump.

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