CN116857540A - Liquid CO under supercritical pressure 2 Continuous feed system - Google Patents
Liquid CO under supercritical pressure 2 Continuous feed system Download PDFInfo
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- CN116857540A CN116857540A CN202310831228.4A CN202310831228A CN116857540A CN 116857540 A CN116857540 A CN 116857540A CN 202310831228 A CN202310831228 A CN 202310831228A CN 116857540 A CN116857540 A CN 116857540A
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- 239000007788 liquid Substances 0.000 title claims abstract description 216
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 220
- 239000010959 steel Substances 0.000 claims abstract description 220
- 230000007246 mechanism Effects 0.000 claims abstract description 78
- 230000001105 regulatory effect Effects 0.000 claims abstract description 40
- 238000003860 storage Methods 0.000 claims abstract description 38
- 238000005303 weighing Methods 0.000 claims abstract description 28
- 238000005485 electric heating Methods 0.000 claims description 7
- 239000013589 supplement Substances 0.000 claims description 6
- 238000001514 detection method Methods 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 228
- 229910002092 carbon dioxide Inorganic materials 0.000 description 114
- 238000000034 method Methods 0.000 description 11
- 230000008569 process Effects 0.000 description 9
- 230000003044 adaptive effect Effects 0.000 description 6
- 238000005520 cutting process Methods 0.000 description 6
- 238000002347 injection Methods 0.000 description 5
- 239000007924 injection Substances 0.000 description 5
- 238000012423 maintenance Methods 0.000 description 4
- 238000005187 foaming Methods 0.000 description 3
- 239000011229 interlayer Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000000087 stabilizing effect Effects 0.000 description 3
- 239000000306 component Substances 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 239000004088 foaming agent Substances 0.000 description 2
- 239000007791 liquid phase Substances 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 238000002513 implantation Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C1/00—Pressure vessels, e.g. gas cylinder, gas tank, replaceable cartridge
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
- F17C13/02—Special adaptations of indicating, measuring, or monitoring equipment
- F17C13/021—Special adaptations of indicating, measuring, or monitoring equipment having the height as the parameter
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
- F17C13/02—Special adaptations of indicating, measuring, or monitoring equipment
- F17C13/023—Special adaptations of indicating, measuring, or monitoring equipment having the mass as the parameter
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
- F17C13/02—Special adaptations of indicating, measuring, or monitoring equipment
- F17C13/025—Special adaptations of indicating, measuring, or monitoring equipment having the pressure as the parameter
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
- F17C13/04—Arrangement or mounting of valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
- F17C13/06—Closures, e.g. cap, breakable member
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
- F17C13/12—Arrangements or mounting of devices for preventing or minimising the effect of explosion ; Other safety measures
- F17C13/126—Arrangements or mounting of devices for preventing or minimising the effect of explosion ; Other safety measures for large storage containers for liquefied gas
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
- F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
- F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
- F17C2205/0323—Valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
- F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
- F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
- F17C2205/0352—Pipes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2221/00—Handled fluid, in particular type of fluid
- F17C2221/01—Pure fluids
- F17C2221/013—Carbone dioxide
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The application relates to a liquid CO2 continuous supply system under supercritical pressure, which comprises a storage tank and a steel bottle, wherein the top of the steel bottle is provided with a liquid inlet end and a liquid outlet end, a supply pipeline is arranged between the storage tank and the steel bottle, the storage tank is connected with a working area through a conveying pipeline, liquid CO2 in the storage tank is pressurized through a supply mechanism and then is sent into the steel bottle, a weighing mechanism immediately weighs the steel bottle, a PLC (programmable logic controller) controller calculates the weight of the liquid CO2 in the steel bottle, when the weight of the liquid CO2 is qualified, the pressure in the steel bottle is regulated through a pressure regulating mechanism, the pressure is kept at 7.5-10.0MPa, and then the pressure and the liquid level of the liquid CO2 in the steel bottle are simultaneously kept in an ideal range through the cooperation of the weighing mechanism and the pressure regulating mechanism, so that the supply requirement can be met.
Description
Technical Field
The application relates to the technical field of supercritical carbon dioxide preparation, in particular to a liquid CO2 continuous supply system under supercritical pressure.
Background
Liquid CO2 has a wide range of applications in the industrial field. For example, in injection foaming and industrial extraction processes, important applications are obtained due to the advantages of excellent dissolving capacity, low price, environmental protection and the like of liquid CO2. In these applications, it is often required that the CO2 must be above a certain pressure. For example, in the field of injection foaming, since the injection head cavity pressure tends to be greater than 7.5MPa or more, CO2 as a foaming agent must also be greater than this pressure value. Otherwise, implantation cannot be completed. At this point, the CO2 has exceeded its critical pressure (about 7.4 MPa). To maintain the CO2 in a liquid state, the temperature must be controlled below the critical temperature (about 31.1 ℃). The common process method is to take a pressure vessel which is specially designed and manufactured as a core component, wherein the vessel has a relatively large volume and is provided with an interlayer. A high-pressure CO2 pump is arranged at the inlet end of the container, liquid CO2 raw materials in a large CO2 storage tank (the volume of the large CO2 storage tank is generally 2-100 cubic meters, the pressure is more than 2.2MPa, the temperature of CO2 is about minus 20 ℃), and the CO2 pressure is raised to 7.5-10.0MPa and is conveyed into the container. The temperature and the flow rate of water flow in the interlayer of the container are controlled to enable the temperature of CO2 to be below the critical temperature and to be combined with the high-pressure pump, the pressure of CO2 in the container is regulated to be in the range of 7.5-10.0MPa, and the conveying working condition of liquid CO2 is met. One of the disadvantages of this process is that the adjustment of the CO2 temperature by the water flow in the interlayer results in a relatively slow adjustment response, which poses a certain risk for controlling the ratio of gas to liquid in the vessel; at the same time, this way of adjustment is relatively complex and difficult to control. For example, when the pressure in the vessel is sufficient, the system cannot be adjusted in time even if the liquid level of liquid CO2 is low. At this time, manual intervention is required to reduce the pressure in the container to restore the normal operation, which is quite disadvantageous to the production. The process equipment has large occupied area, complex installation and relatively high cost.
Disclosure of Invention
In order to solve the problem that the pressure and the liquid level of the container are difficult to maintain at ideal values in the continuous feeding of liquid CO2 by the existing feeding device, the application provides a continuous feeding system for liquid CO2 under supercritical pressure, which adopts the following technical scheme:
the application relates to a liquid CO2 continuous supply system under supercritical pressure, which comprises a storage tank and a steel bottle, wherein the top of the steel bottle is provided with a pressure detection mechanism, a liquid inlet and a liquid outlet, a supply pipeline is arranged between the storage tank and the steel bottle, one end of the supply pipeline is connected with the output end of the storage tank, the other end of the supply pipeline is connected with the liquid inlet of the steel bottle, and the liquid outlet of the supply pipeline is also connected with an output pipeline which is provided with a supply mechanism, and the liquid continuous supply system is characterized by also comprising a PLC (programmable logic controller), wherein the liquid outlet of the supply pipeline extends into the bottle from the liquid inlet and is positioned at the top of the steel bottle, the liquid inlet of the output pipeline extends into the bottle from the liquid outlet and is positioned at the bottom of the steel bottle, the supply pipeline is provided with a pressure regulating mechanism, and the bottom of the steel bottle is provided with a weighing mechanism which are both connected with the PLC in an adaptive manner;
the device also comprises a mechanism for adjusting the liquid level and the pressure of the liquid CO2 in the steel cylinder:
detecting the liquid level in the steel cylinder, firstly, weighing the steel cylinder by using a weighing mechanism, and after weighing, according to a formulaCalculating the density value of CO2 in the steel cylinder, if the measured density value is 215.5-1062.0Kg/m < 3 >, then liquid CO2 exists in the steel cylinder, namely the liquid level exists in the steel cylinder, and then measuring the pressure value in the steel cylinder by using a pressure detection mechanism;
a. if the density value in the steel cylinder is 215.5-1062.0Kg/m3 and the measured pressure value does not reach the lowest set value of 7.5MPa, the condition that the liquid level in the steel cylinder is not up to the standard is indicated, and a supply mechanism is required to be started to pressurize the steel cylinder by a proper flow and pressure regulating mechanism until the pressure reaches the set value;
b. if the density value in the steel cylinder is less than 215.5Kg/m < 3 >, and the measured pressure value reaches the set value of 7.5-10.0MPa, the pressure in the steel cylinder reaches the standard, but the liquid level possibly does not exist, a supply mechanism is required to be started to supplement liquid CO2 into the steel cylinder, and the pressurizing mechanism stops working at the moment;
c. if the density value in the steel bottle is less than 139.6Kg/m3 and the pressure value does not reach the set value of 7.5-10.0MPa, the liquid level and the pressure in the steel bottle are not up to the standard, and the supply mechanism and the pressure regulating mechanism are required to be started simultaneously so as to supplement liquid CO2 when pressurizing the steel bottle until the liquid level and the pressure in the steel bottle reach the standard.
By adopting the technical scheme: the storage tank is used for storing liquid CO2, the steel bottle is connected with the storage tank through a supply pipeline, the supply mechanism pressurizes the liquid CO2 in the storage tank and then sends the pressurized liquid CO2 into the steel bottle, the weighing mechanism weighs the steel bottle, the PLC controller calculates the weight of the liquid CO2 in the steel bottle, the pressure in the steel bottle is regulated through the pressure regulating mechanism, the pressure is kept at 7.5-10.0MPa, and then the weighing mechanism and the pressure regulating mechanism are matched, so that the pressure and the liquid level of the liquid CO2 in the steel bottle are simultaneously kept in an ideal range, and the supply requirement can be met.
The feeding mechanism comprises a standby two pressurizing units, wherein one pressurizing unit comprises an electric high-pressure pump, the other pressurizing unit comprises a pneumatic high-pressure pump, and the feeding mechanism further comprises a frequency converter, an electric valve and an alarm which are connected with the PLC in an adaptive mode, the frequency converter is connected with the electric high-pressure pump, the electric valve is connected with the pneumatic high-pressure pump in an adaptive mode, and the weighing mechanism is set to reach the standard of liquid level when detecting that the density value is 500.8-623.2 Kg/m < 3 >.
By adopting the technical scheme: when one path is failed, the pressurizing unit can be switched to the other path, so that the aim of not influencing normal production is fulfilled, and when the calculated density value is 500.8-623.2 Kg/m < 3 >, the upper part of the steel cylinder is reserved with a proper gas phase space, and the optimal pressure stabilizing effect can be realized.
The weighing mechanism comprises a base, a steel bottle is arranged on the base, a weight sensor is arranged between the steel bottle and the base, the pressure regulating mechanism comprises an electric heating type pressurizer, and the weight sensor and the electric heating type pressurizer are connected with a PLC in an adaptive mode.
By adopting the technical scheme: the weight sensor is arranged on the base and used for weighing the weight of the steel cylinder, the electric heating pressurizer can be used for vaporizing liquid CO2 flowing through the electric heating pressurizer, the volume of the vaporized CO2 is increased, the pressure of the steel cylinder is increased, and when the pressure reaches a set value, the electric pressurizer is powered off, and the pressurizing function is stopped.
The liquid CO2 feeding device is characterized in that a storage tank outlet valve, a steel cylinder liquid inlet check valve and a steel cylinder liquid inlet control valve are sequentially arranged on the feeding pipeline along the liquid CO2 feeding direction, and the pressure regulating mechanism is arranged between the steel cylinder liquid inlet check valve and the steel cylinder liquid inlet control valve.
By adopting the technical scheme: the storage tank outlet valve is used for cutting off the circulation of liquid CO2 between the storage tank and the supply pipeline, the steel cylinder liquid inlet one-way valve is used for avoiding the liquid CO2 backflow of the supply pipeline, and the liquid inlet control valve is used for cutting off the circulation of liquid CO2 between the supply pipeline and the steel cylinder, so that the maintenance and the replacement of the supply pipeline or related parts are facilitated.
And the output pipeline is sequentially provided with a steel cylinder liquid outlet control valve and a steel cylinder liquid outlet one-way valve along the output direction of the liquid CO2.
By adopting the technical scheme: the steel bottle liquid outlet control valve is used for cutting off the circulation of liquid CO2 between the storage tank and the output pipeline, and the steel bottle liquid inlet check valve is used for avoiding the liquid CO2 reflux of the output pipeline, so that the maintenance and the replacement of the output pipeline or related parts are facilitated.
And the supply pipeline and the output pipeline are respectively provided with a steel cylinder liquid inlet hose and a steel cylinder liquid outlet hose, the steel cylinder liquid inlet hose is arranged between the pressure regulating mechanism and the steel cylinder liquid inlet control valve, and the steel cylinder liquid outlet hose is arranged between the steel cylinder liquid outlet control valve and the steel cylinder liquid outlet check valve.
By adopting the technical scheme: in order to overcome or reduce the influence of liquid CO2 inlet and outlet pipes on a steel cylinder weighing system, steel cylinder liquid inlet hoses and steel cylinder liquid outlet hoses are respectively connected to the supply and output pipelines.
The tail end of the output pipeline is provided with a temperature regulating tank, and the temperature regulating tank adopts a water bath type.
By adopting the technical scheme: before the liquid CO2 enters the working area, the temperature of the liquid CO2 is ensured to be below the critical temperature, and continuous supply of the liquid CO2 is ensured.
The top of steel bottle is equipped with the disk seat, is equipped with left, middle and right three and the communicating passageway in the steel bottle on the disk seat, and left and right two passageways are inlet and the liquid outlet of steel bottle respectively, the passageway in the middle of the disk seat is connected with control pipeline, and control pipeline's one end has connected gradually manometer valve and manometer, is equipped with discharge valve and rupture disk on the control pipeline, manometer and PLC controller adaptation are connected.
By adopting the technical scheme: the rupture disk is arranged to ensure that the steel cylinder does not exceed the design pressure in the use process, and the steel cylinder can rapidly participate in work when the pressure in the steel cylinder exceeds the design pressure, so that the steel cylinder is rapidly depressurized, and the use safety of the steel cylinder is ensured.
And a temperature sensor is arranged on the body of the steel bottle and is connected with the PLC in an adaptive manner.
By adopting the technical scheme: the temperature sensor is used for detecting the temperature outside the steel cylinder to ensure that the critical temperature is not exceeded by 31.1 ℃.
The alarm is connected with the pressure gauge, the temperature sensor and the weight sensor in an adaptive manner.
By adopting the technical scheme: if the parameter values obtained by the PLC from the pressure gauge, the temperature sensor and the weight scale exceed the setting range of the pressure gauge, the temperature sensor and the weight scale, the alarm is started to warn the on-site operator to process in time.
By adopting the scheme, the method has the following advantages:
the liquid CO2 continuous supply system under the supercritical pressure comprises a storage tank and a steel bottle, wherein the top of the steel bottle is provided with a liquid inlet end and a liquid outlet end, a supply pipeline is arranged between the storage tank and the steel bottle, the storage tank is connected with a working area through the conveying pipeline, liquid CO2 in the storage tank is pressurized through a supply mechanism and then is sent into the steel bottle, the weight of the steel bottle is immediately weighed by a weighing mechanism, the weight of the liquid CO2 in the steel bottle is obtained through calculation by a PLC (programmable logic controller), after the weight of the liquid CO2 is qualified, the pressure in the steel bottle is regulated through a pressure regulating mechanism, the pressure is kept at 7.5-10.0MPa, and then the pressure and the liquid level of the liquid CO2 in the steel bottle are simultaneously kept in an ideal range through the cooperation of the weighing mechanism and the pressure regulating mechanism, so that the supply requirement can be met.
Drawings
FIG. 1 is a schematic diagram of a continuous feed system for liquid CO2 at supercritical pressure in accordance with the present application.
Reference numerals illustrate: 1. a storage tank; 2. a reservoir outlet valve; 3. an electric high-pressure pump; 3', pneumatic high pressure pump; 4. a frequency converter; 4', an electric valve; 5. a PLC controller; 6. an alarm; 7. a liquid inlet one-way valve of the steel cylinder; 8. a pressurizer; 9. a steel cylinder liquid inlet hose; 10. a pressure gauge; 11. a pressure gauge valve; 12. a steel cylinder liquid inlet control valve; 13. a discharge valve; 14. rupture disk; 15. a control line; 16. a valve seat; 17. a steel cylinder liquid outlet control valve; 18. a steel cylinder liquid outlet hose; 19. a liquid outlet one-way valve of the steel cylinder; 20. a temperature regulating tank; 21. a steel cylinder; 22. an output line; 23. a temperature sensor; 24. a weight sensor.
Detailed Description
The application discloses a liquid CO2 continuous supply system under supercritical pressure, which is suitable for application scenes such as a foaming agent injection link of injection foaming, a CO2 extraction process and the like, and is described below with reference to drawings and embodiments.
As shown in fig. 1, a liquid CO2 continuous supply system under supercritical pressure is shown, which comprises a storage tank 1 and a steel cylinder 21, wherein the top of the steel cylinder 21 is provided with a liquid inlet end and a liquid outlet end, the steel cylinder 21 of the embodiment adopts a standardized CO2 storage steel cylinder 21 in the market, and the standardized steel cylinder 21 has various specifications of 40L-120L and the like, and can be flexibly selected according to the delivery amount of CO2 in unit time. And the steel cylinder 21 is a standard product, and the design working pressure is 20.0MPa; a supply pipeline is arranged between the storage tank 1 and the steel cylinder 21, one end of the supply pipeline is connected with the output end of the storage tank 1, and the other end of the supply pipeline is connected with the liquid inlet end of the steel cylinder 21; the liquid outlet end is also connected with an output pipeline 22, the top end of the steel bottle 21 is provided with a valve seat 16, the valve seat 16 is provided with a left channel, a middle channel and a right channel which are communicated with the inside of the steel bottle 21, the left channel and the right channel are respectively a liquid inlet and a liquid outlet of the steel bottle 21, the middle channel of the valve seat 16 is connected with a control pipeline 15, one end of the control pipeline 15 is sequentially connected with a pressure gauge 10 and a pressure gauge valve 11, the control pipeline 15 is also provided with a pressure valve, the control pipeline 15 is provided with a discharge valve 13 and a rupture disc 14, the pressure gauge 10 is electrically connected with the PLC controller 5, the rupture disc 14 is arranged to ensure that the steel bottle 21 does not exceed the design pressure in the using process, and the steel bottle 21 can rapidly participate in working when the pressure in the steel bottle 21 exceeds the design pressure, so that the steel bottle 21 can rapidly release pressure, and the use safety of the steel bottle 21 is ensured.
The embodiment also comprises a mechanism for adjusting the liquid level and pressure of the liquid CO2 in the steel cylinder 21:
the liquid level in the steel cylinder 21 is detected, and the steel cylinder 21 is weighed by a weighing mechanism, and since the specification of the steel cylinder 21 in this embodiment can be determined,so that it can be according to the formulaCalculating the density value of CO2 in the steel cylinder 21, if the measured density value is 215.5-1062.04Kg/m < 3 >, then the liquid CO2 exists in the steel cylinder 21, namely the liquid level exists in the steel cylinder 21, and then, measuring the pressure value in the steel cylinder 21 by utilizing a pressure detection mechanism;
the critical pressure of the CO2 in the steel bottle 21 is about 7.4MPa, the temperature of the CO2 coming out of the storage tank 1 is only-20 ℃, so that the pressure value in the steel bottle 21 needs to be more than 7.5MPa, the temperature of the CO2 is far lower than the critical temperature of the CO2 after the steel bottle 21 is pressurized, the liquid CO2 can be stored in the steel bottle 21, the storage amount of the CO2 in the steel bottle 21 is regulated, the CO2 at the upper part of the steel bottle 21 is in a gaseous state, the lower part of the steel bottle is in a liquid state, and the liquid level of the liquid CO2 is not higher and better, a better pressure stabilizing effect can be achieved by storing a certain amount of the gaseous CO2, therefore, the liquid level is set to reach the standard when the weighing mechanism detects that the density value is 500.8-623.2/m 3, at the moment, the CO2 gas and the liquid phases in the steel bottle occupy 50% of space respectively, the optimal pressure stabilizing effect can be achieved, and the space occupation ratio of the gas and the liquid phases in the steel bottle can be flexibly configured according to the specific consumption amount and pressure fluctuation condition of the CO2 at the rear end.
a. If the measured density value is 215.5-1062.0Kg/m3 and the measured pressure value does not reach the set value of 7.5MPa, the condition that the liquid level exists in the steel cylinder 21 but the pressure does not reach the standard is indicated, and a pressure regulating mechanism is required to be started to pressurize the steel cylinder 21 until the pressure reaches the set value;
b. if the measured pressure value reaches the set value of 7.5MPa and is smaller than the safety value of 10.0MPa and the measured density value is smaller than 215.5Kg/m < 3 >, the pressure in the steel cylinder 21 reaches the standard but the liquid level does not reach the standard, a supply mechanism is required to be started to supplement liquid CO2 into the steel cylinder 21, and the pressure regulating mechanism stops working at the moment;
c. if the density value in the steel bottle 21 is less than 139.6Kg/m3 and the pressure value does not reach the set value of 7.5MPa, the condition that the liquid level in the steel bottle 21 does not reach the standard is indicated, and the supply mechanism and the pressure regulating mechanism are started simultaneously to pressurize the steel bottle 21 and supplement liquid CO2 until the liquid level and the pressure in the steel bottle 21 reach the standard.
In addition, the liquid outlet of the supply pipeline stretches into the bottle from the liquid inlet end and is positioned at the top of the steel bottle 21, the liquid inlet of the output pipeline 22 stretches into the bottle from the liquid outlet end and is positioned at the bottom of the steel bottle 21, the supply pipeline is provided with a pressure regulating mechanism, the bottom of the steel bottle 21 is provided with a weighing mechanism 24, the pressure regulating mechanism and the weighing mechanism are electrically connected with the PLC 5, the steel bottle 21 is connected with the storage tank 1 through the supply pipeline, the supply mechanism pressurizes liquid CO2 in the storage tank 1 and then sends the liquid CO2 into the steel bottle 21, the weighing mechanism weighs the weight of the steel bottle 21, the PLC 5 calculates the weight of the liquid CO2 in the steel bottle 21, then adjusts the pressure in the steel bottle 21 through the pressure regulating mechanism, the pressure is ensured to be maintained at 7.5-10.0MPa, and then the pressure and the liquid level of the liquid CO2 in the steel bottle 21 are simultaneously kept in an ideal range through the cooperation of the weighing mechanism and the pressure regulating mechanism, so that the supply requirement of the CO2 can be met.
In this embodiment, the weighing mechanism has a base, the steel cylinder 21 is mounted on the base, a weight sensor 24 is disposed between the steel cylinder 21 and the base for directly weighing the weight of the steel cylinder 21, the weight sensor 24 is of model NA4, the pressure regulating mechanism has an electrically heated pressurizer 8, the weight sensor 24 and the electrically heated pressurizer 8 are electrically connected with the PLC controller 5, the weight sensor 24 is of model NA4, the electrically heated pressurizer 8 is of model LC-500, the electrically heated pressurizer 8 is used for increasing the pressure in the steel cylinder 21, and after the pressure reaches a set value, the electrically heated pressurizer 8 is powered off to stop the pressurizing function, thereby maintaining the pressure in the steel cylinder 21 within an ideal range.
Further, an outlet valve of the storage tank 1, an electric high-pressure pump 3 or a pneumatic high-pressure pump 3', a steel cylinder liquid inlet check valve 7 and a steel cylinder liquid inlet control valve 12 are sequentially arranged on the supply pipeline along the input direction of the liquid CO2, a pressure regulating mechanism is arranged between the steel cylinder liquid inlet check valve 7 and the steel cylinder liquid inlet control valve 12, wherein the outlet valve of the storage tank 1 is used for cutting off the circulation of the liquid CO2 between the storage tank 1 and the supply pipeline, the steel cylinder liquid inlet check valve 7 is used for avoiding the backflow of the liquid CO2 of the supply pipeline, the liquid inlet control valve 13 is used for cutting off the circulation of the liquid CO2 between the supply pipeline and the steel cylinder 21, the maintenance and replacement of the supply pipeline or related components are facilitated, and a liquid outlet control valve 17 and a steel cylinder liquid outlet check valve 19 are sequentially arranged on the output pipeline 22 along the output direction of the liquid CO2, wherein the steel cylinder liquid outlet control valve 17 is used for cutting off the circulation of the liquid CO2 between the storage tank 1 and the output pipeline 22, and the liquid inlet check valve 7 is used for avoiding the backflow of the liquid CO2 of the output pipeline 22, and the maintenance and replacement of the steel cylinder 22 or related components are facilitated.
Specifically, the embodiment further includes a frequency converter 4, an electric valve 4', and an alarm 6, which are adaptively connected with the PLC controller 5, wherein the frequency converter 4 is adaptively connected with the electric high-pressure pump 3, the electric valve 4' is adaptively connected with the pneumatic high-pressure pump 3', and the alarm 6 is electrically connected with the pressure gauge 10, the temperature sensor 23, and the weight sensor 24. The sensors on the two pipelines are combined with the PLC 5, the weight, the pressure, the temperature and other parameters of the CO2 in the steel cylinder 21 are accurately measured through the weight, the temperature and the pressure sensing devices, the parameters are transmitted to a control system of the PLC 5, and the PLC 5 adjusts and controls the parameters of the CO2 such as the inflow amount, the pressure and the temperature according to the set parameter values, so that the CO2 is in a stable and continuous liquid conveying state, and the whole device can safely, reliably and stably operate.
Firstly, pressurizing liquid CO2 in a CO2 storage tank 1 by an electric high-pressure pump 3 or a pneumatic high-pressure pump 3', then conveying the pressurized liquid CO2 into a CO2 steel cylinder 21, and connecting a pressure gauge 10 with a pressure sensor for detecting a pressure value in the steel cylinder 21 so as to facilitate the observation and supervision of field operators; in addition, in order to ensure the reliability of CO2 delivery, a pressurizing unit in a supply mechanism adopts a standby mode, wherein one path is an electric high-pressure pump 3, and the other path is a pneumatic high-pressure pump 3'; the electric pressurizing process is as follows: a PLC controller 5, a frequency converter 4 and an electric high-pressure pump 3; the pneumatic pressurizing and conveying process comprises the following steps: a PLC controller 5-an electrically operated valve 4 '(for controlling the flow rate of the air pump) -an air-operated high-pressure pump 3'; when one path fails, the other path can be switched to achieve the purpose of not affecting normal production; here, only one of the pressurizing units may be selected for use, and a spare pressurizing unit may not be provided; during normal operation, the pressure gauge 10 transmits a detected pressure signal to the controller of the PLC 5, if the pressure in the steel bottle 21 does not reach the lowest set value of 7.5MPa, the electric heating type pressurizer 8 is started, at the moment, liquid CO2 flowing through the pressurizer 8 is gasified, the volume of the gasified CO2 is increased, the pressure of the steel bottle 21 is increased after the gaseous CO2 expands in the steel bottle 21, when the pressure reaches the set value of 10.0MPa, the pressurizer 8 is powered off, the gasification function is stopped at the moment, and when the pressure in the steel bottle 21 is reduced to be below the lowest set value of 7.5MPa, the pressurizer 8 is powered on to operate, so that the pressure in the steel bottle 21 is maintained in an ideal range.
Next, liquid CO2 is discharged, and in order to ensure that liquid CO2 flows in the liquid outlet pipe, the level of CO2 in the steel cylinder 21 is ensured. If the CO2 in the cylinder 21 is not in a supercritical state, there is a significant gas/liquid interface. At a temperature of-20 to 20 ℃ and a pressure of 7.5 to 10.0MPa, the density of liquid CO2 is between 821.0Kg and 1062.0Kg/m3, and the density of gaseous CO2 is between 139.6Kg and 215.5Kg/m 3. From this, it can be seen that the minimum density of liquid CO2 is 4-5 times higher than the maximum density of gaseous CO2. Thus, in this embodiment, the weight of CO2 in the steel cylinder 21 can be measured by the weight measuring device, and since the steel cylinder 21 has a fixed volume, the density value of CO2 in the steel cylinder 21 can be calculated by using the mass of the steel cylinder 21 measured, if the density value is larger than 215.5Kg/m3, it means that liquid CO2 is necessary in the steel cylinder 21, and if the density value reaches 1062.0Kg/m3, the density value of CO2 in the steel cylinder 21 is all liquid. Therefore, according to the specification of the steel cylinder 21, the real-time liquid CO2 level in the steel cylinder 21 can be accurately calculated by the weight sensor 24.
Meanwhile, in order to reduce the influence of the CO2 inlet and outlet pipe on the weighing system of the steel bottle 21, in this embodiment, the inlet and outlet hoses of the steel bottle 21 are provided on the supply line and the output line 22, specifically, as shown in the figure, the steel bottle liquid inlet hose 9 is provided between the pressure regulating mechanism and the steel bottle liquid inlet control valve 12, and the steel bottle liquid outlet hose 18 is provided between the steel bottle liquid outlet control valve 17 and the steel bottle liquid outlet check valve 19.
Before the liquid CO2 enters the working area, the temperature of the liquid CO2 is ensured to be below a critical temperature, continuous supply of the liquid CO2 is ensured, and a water bath type temperature regulating tank 20 is arranged at the tail end of an output pipeline 22.
In addition, a temperature sensor 23 is installed outside the steel cylinder 21, and the temperature sensor 23 is connected with the PLC controller 5 in an adapting way, so as to detect the temperature outside the steel cylinder 21 and ensure that the temperature does not exceed the critical temperature of 31.1 ℃, and the original temperature of CO2 is in a low-temperature state. The probability of exceeding the critical temperature is almost zero in the operating state.
The pressure gauge 10, the temperature sensor 23 and the weight scale are all connected with the PLC controller 5, when the parameter values obtained by the pressure gauge 10, the temperature sensor 23 and the weight scale exceed the set ranges of the pressure gauge 10, the temperature sensor 23 and the weight scale, the sensors immediately feed back to the PLC controller 5, and then the PLC controller 5 starts the alarm 6 to warn field operators to process in time.
While the application has been described in conjunction with specific embodiments, it will be apparent to those skilled in the art that these descriptions are intended to be illustrative, and not limiting, of the scope of the application, and that various changes and modifications may be made by those skilled in the art in light of the spirit and principles of the application, which are also within the scope of the application.
Claims (10)
1. The liquid CO2 continuous supply system under the supercritical pressure comprises a storage tank (1) and a steel bottle (21), wherein a pressure detection mechanism, a liquid inlet end and a liquid outlet end are arranged at the top of the steel bottle (21), a supply pipeline is arranged between the storage tank (1) and the steel bottle (21), one end of the supply pipeline is connected with the output end of the storage tank (1), the other end of the supply pipeline is connected with the liquid inlet end of the steel bottle (21), an output pipeline (22) is further connected to the liquid outlet end, and the supply pipeline is provided with a supply mechanism, and is characterized by further comprising a PLC (programmable logic controller) 5), a liquid outlet of the supply pipeline extends into the bottle from the liquid inlet end and is positioned at the top of the steel bottle (21), a liquid inlet of the output pipeline (22) extends into the bottle from the liquid outlet end and is positioned at the bottom of the steel bottle (21), a pressure regulating mechanism is arranged at the bottom of the steel bottle (21), and the pressure regulating mechanism and the weighing mechanism are respectively connected with the PLC (5) in an adapting mode;
the device also comprises a mechanism for adjusting the liquid level and the pressure of the liquid CO2 in the steel cylinder (21):
the liquid level in the steel cylinder (21) is detected, firstly, the steel cylinder (21) is weighed by a weighing mechanism, and after weighing, the steel cylinder is weighed according to a formulaCalculating the density value of CO2 in the steel cylinder (21), if the measured density value is 215.5-1062.0Kg/m < 3 >, then the liquid CO2 exists in the steel cylinder (21), namely the liquid level exists in the steel cylinder (21), and then, measuring the pressure value in the steel cylinder (21) by utilizing a pressure detection mechanism;
a. if the density value in the steel bottle (21) is 215.5-1062.0Kg/m3 and the measured pressure value does not reach the lowest set value of 7.5MPa, the condition that the liquid level in the steel bottle (21) is not up to the standard is indicated, and a supply mechanism is required to be started to pressurize the steel bottle (21) with proper flow and pressure regulating mechanism until the pressure reaches the set value;
b. if the density value in the steel bottle (21) is smaller than 215.5Kg/m < 3 >, and the measured pressure value reaches the set value of 7.5-10.0MPa, the pressure in the steel bottle (21) reaches the standard, but the liquid level possibly does not exist, a supply mechanism is required to be started to supplement liquid CO2 into the steel bottle (21), and the pressurizing mechanism stops working at the moment;
c. if the density value in the steel bottle (21) is less than 139.6Kg/m < 3 >, and the pressure value does not reach the set value of 7.5-10.0MPa, the liquid level and the pressure in the steel bottle (21) are not up to the standard, and the supply mechanism and the pressure regulating mechanism are required to be started simultaneously so as to supplement liquid CO2 while pressurizing the steel bottle (21) until the liquid level and the pressure in the steel bottle (21) reach the standard.
2. The continuous supply system of liquid CO2 under supercritical pressure according to claim 1, wherein the supply mechanism comprises a backup of two pressurizing units, one pressurizing unit comprises an electric high-pressure pump (3), the other pressurizing unit comprises a pneumatic high-pressure pump (3 '), the continuous supply system further comprises a frequency converter (4), an electric valve (4') and an alarm (6) which are connected with a PLC (5) in an adapting way, the frequency converter (4) is connected with the electric high-pressure pump (3) and the electric valve (4 ') is connected with the pneumatic high-pressure pump (3') in an adapting way, and the weighing mechanism is set to reach the standard of the liquid level when detecting that the density value is 500.8-623.2 Kg/m 3.
3. The continuous supply system of liquid CO2 under supercritical pressure according to claim 2, wherein the weighing mechanism comprises a base, a steel bottle (21) is installed on the base, a weight sensor (24) is arranged between the steel bottle (21) and the base, the pressure regulating mechanism comprises an electric heating type pressurizer (8), and the weight sensor (24) and the electric heating type pressurizer (8) are connected with the PLC controller (5) in a fit mode.
4. A continuous supply system of liquid CO2 under supercritical pressure according to claim 1, 2 or 3, wherein the supply pipeline is provided with a storage tank (1) outlet valve, a steel cylinder liquid inlet check valve (7) and a steel cylinder liquid inlet control valve (12) in sequence along the input direction of the liquid CO2, and the pressure regulating mechanism is arranged between the steel cylinder liquid inlet check valve (7) and the steel cylinder liquid inlet control valve (12).
5. The continuous supply system of liquid CO2 under supercritical pressure according to claim 4, wherein the output line (22) is provided with a cylinder liquid outlet control valve (17) and a cylinder liquid outlet check valve (19) in sequence along the output direction of the liquid CO2.
6. The continuous supply system of liquid CO2 under supercritical pressure according to claim 5, wherein the supply line and the output line (22) are respectively provided with a steel cylinder liquid inlet hose (9) and a steel cylinder liquid outlet hose (18), the steel cylinder liquid inlet hose (9) is arranged between the pressure regulating mechanism and the steel cylinder liquid inlet control valve (12), and the steel cylinder liquid outlet hose (18) is arranged between the steel cylinder liquid outlet control valve (17) and the steel cylinder liquid outlet one-way valve (19).
7. The continuous supply system of liquid CO2 under supercritical pressure according to claim 1, wherein the end of the output line (22) is provided with a temperature regulating tank (20), and the temperature regulating tank (20) is of a water bath type.
8. A continuous supply system of liquid CO2 under supercritical pressure according to claim 3, wherein the top end of the steel bottle (21) is provided with a valve seat (16), the valve seat (16) is provided with three channels which are left, middle and right and communicated with the interior of the steel bottle (21), the left and right channels are respectively a liquid inlet and a liquid outlet of the steel bottle (21), the channel in the middle of the valve seat (16) is connected with a control pipeline (15), one end of the control pipeline (15) is sequentially connected with a pressure gauge valve (11) and a pressure gauge (10), the control pipeline (15) is provided with a discharge valve (13) and a rupture disc (14), and the pressure gauge (10) is connected with the PLC controller (5) in an adapting way.
9. The continuous supply system of liquid CO2 under supercritical pressure according to claim 8, wherein the steel cylinder (21) is provided with a temperature sensor (23) on the body, and the temperature sensor (23) is connected with the PLC controller (5) in an adapting way.
10. Continuous supply system of liquid CO2 at supercritical pressure according to claim 9, characterized in that the alarm (6) is adapted to be connected with a pressure gauge (10), a temperature sensor (23), a weight sensor (24).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310831228.4A CN116857540A (en) | 2023-07-07 | 2023-07-07 | Liquid CO under supercritical pressure 2 Continuous feed system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310831228.4A CN116857540A (en) | 2023-07-07 | 2023-07-07 | Liquid CO under supercritical pressure 2 Continuous feed system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116857540A true CN116857540A (en) | 2023-10-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310831228.4A Pending CN116857540A (en) | 2023-07-07 | 2023-07-07 | Liquid CO under supercritical pressure 2 Continuous feed system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116857540A (en) |
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2023
- 2023-07-07 CN CN202310831228.4A patent/CN116857540A/en active Pending
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