CN112050074A - C5-PFK gas mixing preparation device and method based on weighing and partial pressure combined method - Google Patents

C5-PFK gas mixing preparation device and method based on weighing and partial pressure combined method Download PDF

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CN112050074A
CN112050074A CN202010912722.XA CN202010912722A CN112050074A CN 112050074 A CN112050074 A CN 112050074A CN 202010912722 A CN202010912722 A CN 202010912722A CN 112050074 A CN112050074 A CN 112050074A
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gas
pipeline
mixed gas
diluent
partial pressure
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李建国
汪献忠
朱会
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Henan Relations Co Ltd
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Henan Relations Co Ltd
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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
    • F17C5/00—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures
    • F17C5/06—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures for filling with compressed gases
    • 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
    • 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
    • F17C13/002—Details of vessels or of the filling or discharging of vessels for vessels under pressure
    • 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
    • F17C7/00—Methods or apparatus for discharging liquefied, solidified, or compressed gases from pressure vessels, not covered by another subclass
    • 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
    • F17C7/00—Methods or apparatus for discharging liquefied, solidified, or compressed gases from pressure vessels, not covered by another subclass
    • F17C7/02—Discharging liquefied gases
    • F17C7/04—Discharging liquefied gases with change of state, e.g. vaporisation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17D—PIPE-LINE SYSTEMS; PIPE-LINES
    • F17D1/00—Pipe-line systems
    • F17D1/02—Pipe-line systems for gases or vapours
    • F17D1/04—Pipe-line systems for gases or vapours for distribution of gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17D—PIPE-LINE SYSTEMS; PIPE-LINES
    • F17D1/00—Pipe-line systems
    • F17D1/02—Pipe-line systems for gases or vapours
    • F17D1/065—Arrangements for producing propulsion of gases or vapours
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17D—PIPE-LINE SYSTEMS; PIPE-LINES
    • F17D1/00—Pipe-line systems
    • F17D1/02—Pipe-line systems for gases or vapours
    • F17D1/065—Arrangements for producing propulsion of gases or vapours
    • F17D1/075—Arrangements for producing propulsion of gases or vapours by mere expansion from an initial pressure level, e.g. by arrangement of a flow-control valve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17D—PIPE-LINE SYSTEMS; PIPE-LINES
    • F17D3/00—Arrangements for supervising or controlling working operations
    • F17D3/01—Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product
    • 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
    • F17C2205/01—Mounting arrangements
    • F17C2205/0123—Mounting arrangements characterised by number of vessels
    • F17C2205/013—Two or more vessels
    • F17C2205/0134—Two or more vessels characterised by the presence of fluid connection between vessels
    • 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
    • F17C2221/03—Mixtures
    • 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
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/01—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
    • F17C2223/0107—Single phase
    • F17C2223/013—Single phase liquid
    • 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
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/03—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the pressure level
    • F17C2223/038—Subatmospheric pressure
    • 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
    • F17C2225/00—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel
    • F17C2225/01—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel characterised by the phase
    • F17C2225/0107—Single phase
    • F17C2225/0123—Single phase gaseous, e.g. CNG, GNC
    • 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
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/01—Propulsion of the fluid
    • F17C2227/0114—Propulsion of the fluid with vacuum injectors, e.g. venturi
    • 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
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/01—Propulsion of the fluid
    • F17C2227/0192—Propulsion of the fluid by using a working fluid
    • 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
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/03—Heat exchange with the fluid
    • F17C2227/0302—Heat exchange with the fluid by heating
    • 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
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/03—Heat exchange with the fluid
    • F17C2227/0367—Localisation of heat exchange
    • F17C2227/0388—Localisation of heat exchange separate
    • F17C2227/039—Localisation of heat exchange separate on the 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
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/04—Methods for emptying or filling
    • F17C2227/045—Methods for emptying or filling by vacuum
    • 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
    • F17C2250/00—Accessories; Control means; Indicating, measuring or monitoring of parameters
    • F17C2250/03—Control means
    • 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
    • F17C2250/00—Accessories; Control means; Indicating, measuring or monitoring of parameters
    • F17C2250/04—Indicating or measuring of parameters as input values
    • F17C2250/0404—Parameters indicated or measured
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
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    • F17C2250/00—Accessories; Control means; Indicating, measuring or monitoring of parameters
    • F17C2250/04—Indicating or measuring of parameters as input values
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Abstract

The C5-PFK mixed gas preparation device based on the weighing and partial pressure combined method is characterized in that: the device comprises a C5 insulating liquid storage steel cylinder, a diluent gas source, a C5 insulating liquid output pipeline, a diluent gas output branch pipeline, a mixed gas storage container, a mixed gas pipeline and a vacuumizing pipeline; the gas inlet end of the C5 insulating liquid output pipeline is connected with the outlet of the C5 insulating liquid storage steel cylinder and extends to the bottom of the steel cylinder, the gas outlet end of the C5 insulating liquid output pipeline is connected with the gas inlet of the mixed gas pipeline, the gas inlet end of the diluent gas output pipeline is connected with the gas outlet of the diluent gas source, the gas outlet end of the diluent gas output branch pipeline is also connected with the gas inlet of the mixed gas pipeline, the gas inlet of the diluent gas output branch pipeline is connected with the gas outlet of a pressure reducing and stabilizing valve on the diluent gas output pipeline, the gas outlet of the diluent gas output branch pipeline is connected with. The invention also discloses a preparation method of the C5-PFK mixed gas. The invention can reduce the problems of low mixed gas pressure, low concentration and the like caused by liquefaction of the C5 gas.

Description

C5-PFK gas mixing preparation device and method based on weighing and partial pressure combined method
Technical Field
The invention belongs to the technical field of preparation of mixed gas, and particularly relates to a gas-liquid mixing device and a preparation method for preparing mixed insulating gas from liquid fluid and diluent gas.
Background
C5-PFK is an insulating fluid of the formula C5F10O (C5 for short), under the same condition, the insulating capability of C5-PFK is sulfur hexafluoride gas (SF)6) 1.6 times of the total weight of the powder. However, the saturated vapor pressure of C5-PFK is lower, the liquefaction temperature is 26 ℃, and in practical engineering application, the saturated vapor pressure needs to be mixed with diluent gas for use, so that the vapor pressure of the mixed gas is increased, and the liquefaction temperature is reduced.
The mixing of two kinds of gas substances can adopt a gas mass flow meter to carry out dynamic gas distribution, and the prepared mixed gas can be directly used without standing. However, this method is not suitable for the mixed preparation of gas and liquid.
For the mixing of C5-PFK with the diluent gas Air, a partial pressure method is commonly used. The partial pressure method is greatly influenced by temperature, so that a large amount of the preparation can not be carried out on an engineering site, but the preparation can be carried out in a small batch under the laboratory condition. The C5-PFK exists in a steel cylinder in a liquid state, a container which is vacuumized is required to extract gaseous C5-PFK through partial pressure method preparation, the C5-PFK is continuously vaporized and absorbs heat in the extraction process, the subsequent C5-PFK is slow in vaporization speed and low in temperature, the pressure fluctuation of the prepared gas is caused by the temperature change, and the concentration error of the prepared mixed gas is large.
Disclosure of Invention
The invention provides a C5-PFK mixed gas preparation device based on a weighing and partial pressure combined method, aiming at solving the defects in the prior art.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention relates to a C5-PFK mixed gas preparation device based on a weighing and partial pressure combined method, which comprises a C5 insulating liquid storage steel cylinder, a diluent gas source, a C5 insulating liquid output pipeline, a diluent gas output branch pipeline, a mixed gas storage container, a mixed gas pipeline and a vacuumizing pipeline, wherein the diluent gas output branch pipeline is connected with the C5 insulating liquid storage steel cylinder;
the gas inlet end of the C5 insulating liquid output pipeline is connected with the outlet of the C5 insulating liquid storage steel cylinder and extends to the bottom of the steel cylinder, the gas outlet end of the C5 insulating liquid output pipeline is connected with the gas inlet of the mixed gas pipeline, and a first electromagnetic valve, a first heat exchanger and a first needle valve are sequentially arranged on the C5 insulating liquid output pipeline from the gas inlet end to the gas outlet end;
the gas inlet end of the diluent gas output pipeline is connected with the gas outlet of the diluent gas source, the gas outlet end of the diluent gas output pipeline is also connected with the gas inlet of the mixed gas pipeline, and a pressure reducing and stabilizing valve, a second heat exchanger and a second needle valve are sequentially arranged on the diluent gas output pipeline from the gas inlet end to the gas outlet end;
the gas inlet of the diluent gas output branch pipeline is connected to the gas outlet of a pressure reducing and stabilizing valve on the diluent gas output pipeline, the gas outlet of the diluent gas output branch pipeline is connected with the inlet of a C5 insulating liquid storage steel cylinder, and a second electromagnetic valve is arranged on the diluent gas output branch pipeline;
the gas outlet of the mixed gas pipeline is connected with a mixed gas storage container, and a pressure sensor is arranged on the mixed gas pipeline;
a first weighing device is arranged below the C5 insulating liquid storage steel cylinder.
And a second weighing device is arranged below the diluent gas cylinder.
The pumping hole of the vacuum pumping pipeline is also connected to the gas inlet of the mixed gas pipeline and is simultaneously communicated with the diluent gas output pipeline and the C5 insulating liquid output pipeline, a third electromagnetic valve and a vacuum pump are arranged on the vacuum pumping pipeline, and the outlet of the vacuum pump is connected with a silencer.
The method for preparing the C5-PFK mixed gas based on the combined weighing and partial pressure method comprises the following steps,
(1) firstly, vacuumizing a container and a pipeline;
(2) calculating the required weight of each component in the mixed gas to be prepared according to a weighing method, and calculating the partial pressure of each component in the mixed gas to be prepared according to a partial pressure principle;
(3) and preparing mixed gas.
Vacuumizing the container and the pipeline in the step (1), wherein the specific process is that a first electromagnetic valve, a second electromagnetic valve, a third electromagnetic valve, a vacuum pump, a first needle valve and a second needle valve are opened, a pressure reducing and stabilizing valve of a dilution gas source is closed, and an inlet valve and an outlet valve on a C5 insulating liquid storage steel cylinder body are closed; starting a vacuum pump, and vacuumizing the pipeline system and the mixed gas storage container except the C5 insulating liquid storage steel cylinder, the pipeline system and the diluent gas source; when the pressure value of the pressure sensor is 10Pa, the vacuumizing is stopped.
The required weight of each component in the mixed gas to be prepared is calculated according to a weighing method in the step (2), the specific operation is,
when gas is prepared, the volume of a storage container of mixed gas to be prepared, the concentration of C5 and the concentration of diluent gas are known, the molar mass of C5 and the molar mass of the diluent gas are known, and the mass of each component C5 fluid in the mixed gas to be prepared and the mass of the diluent gas, namely the weight of C5 and the diluent gas, can be calculated through the following formulas;
Figure 100002_DEST_PATH_IMAGE001
r-gas constant (8.31451J/mol k);
t-ambient temperature in K;
Zftemperature T and pressure PfThe compression coefficient of different gases is within 1 MPa, Zf≈1。
The step (2) of calculating the partial pressure of each component in the mixed gas to be prepared according to the partial pressure principle has the specific operation that,
calculating partial pressure P of component C5 in the mixed gas to be prepared in the mixed gas by partial pressure principleC5；
PC5=PGeneral assembly*fC5
fC5Is the concentration of component C5 in the mixed gas;
partial pressure P of diluent gas in mixed gas to be preparedDiluting gas，
PDiluting gas=PGeneral assembly-PC5。
The preparation of the mixed gas in the step (3) comprises the following specific operations,
firstly, stabilizing the pressure of the pressure reducing and stabilizing valve to PC5Pressure, opening the second and first solenoid valves, flowing the diluent gas into the top of the C5 liquid storage cylinder through the diluent gas output branch pipe, pressing the C5 liquid into the first heat exchanger for vaporization, controlling the weight of C5 entering the mixed gas storage container through the combination of the first weighing sensor and the first needle valve, and closing the second and first solenoid valves and the first needle valve when the C5 gas inflow is reached;
then filling the container with the diluent gas, and adjusting the pressure of the pressure reducing and stabilizing valve to PGeneral assemblyThe second needle valve and the second weighing sensor are combined to control the weight of the diluent gas air entering the mixed gas storage container, the air inflow amount reaches, and the pressure reducing and stabilizing valve and the second needle valve are closed; the prepared mixed gas is static for 24 hours to ensure that the gas is fully mixed.
The concentration deviation of the mixed gas prepared by the combined method is less than 0.3 percent.
In the structure, the pressure reduction and stabilization electromagnetic valve is used for reducing pressure and stabilizing pressure of diluent gas, so that the stability of the gas flow is ensured. The first solenoid valve controls the C5 insulating liquid, the second solenoid valve controls the diluent gas into the C5 insulating liquid storage cylinder; the third electromagnetic valve controls the vacuumizing airflow. The first needle valve controls the flow of the diluent gas and the second needle valve controls the flow of the entrained C5 insulating liquid. The first and second heat exchangers maintain both the diluent gas and the C5 vaporized gas at the same temperature state.
The invention has the advantages that the gas distribution by the combination method of weighing and partial pressure can reduce the gas C5LiquefactionThe problems of low mixed gas pressure, low concentration and the like of preparation can be solved, and the problems of low vapor pressure of C5 gas, slow gas distribution process caused by subsequent temperature reduction and the like can be solved.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Detailed Description
Referring to fig. 1, the present embodiment describes a device and a method for preparing a C5-PFK mixed gas based on a combined weighing and partial pressure method, taking a C5-PFK liquid fluid and a diluent gas Air as examples.
The invention relates to a C5-PFK mixed gas preparation device based on a weighing and partial pressure combined method, which comprises a C5 insulating liquid storage steel cylinder 1, a diluent gas cylinder 2, a C5 insulating liquid output pipeline 3, a diluent gas output pipeline 4, a diluent gas output branch pipeline 5, a mixed gas storage container 6, a mixed gas pipeline 7 and a vacuumizing pipeline 8;
the gas inlet end of the C5 insulating liquid output pipeline 3 is connected with the outlet of the C5 insulating liquid storage steel cylinder 1 and extends to the bottom of the steel cylinder, the gas outlet end is connected with the gas inlet of the mixed gas pipeline 7, and the C5 insulating liquid output pipeline 3 is sequentially provided with a first electromagnetic valve 9a, a first heat exchanger 10a and a first needle valve 11a from the gas inlet end to the gas outlet end;
the gas inlet end of the diluent gas output pipeline 4 is connected with the gas outlet of the diluent gas cylinder 2, the gas outlet end of the diluent gas output pipeline is connected with the gas inlet of the mixed gas pipeline 7, and a pressure reducing and stabilizing valve 12, a second heat exchanger 10b and a second needle valve 11b are sequentially arranged on the diluent gas output pipeline 4 from the gas inlet end to the gas outlet end;
the gas inlet of the diluent gas output branch pipeline 5 is connected to the gas outlet of the pressure reducing and stabilizing valve 12 on the diluent gas output pipeline 4, the gas outlet of the diluent gas output branch pipeline 5 is connected with the inlet of the C5 insulating liquid storage steel cylinder 1, and the diluent gas output branch pipeline 5 is provided with a second electromagnetic valve 9 b;
the gas outlet of the mixed gas pipeline 7 is connected with the mixed gas storage container 6, and the mixed gas pipeline 7 is provided with a pressure sensor 13;
the first weighing device 16a and the second weighing device 16b are respectively arranged under the C5 insulating liquid storage steel cylinder 1 and the diluent gas cylinder 2.
The pumping hole of the vacuum pumping pipeline 8 is also connected to the gas inlet of the mixed gas pipeline 7 and is simultaneously communicated with the diluent gas output pipeline 4 and the C5 insulating liquid output pipeline 3, the vacuum pumping pipeline 8 is provided with a third electromagnetic valve 11C and a vacuum pump 14, and the outlet of the vacuum pump 14 is connected with a silencer 15.
The method for preparing the C5-PFK mixed gas based on the combined weighing and partial pressure method comprises the following steps,
(1) vacuumizing the container and the pipeline;
(2) calculating the required weight of each component in the mixed gas to be prepared according to a weighing method, and calculating the partial pressure of each component in the mixed gas to be prepared according to a partial pressure principle;
(3) and preparing mixed gas.
The step (1) of vacuumizing the container and the pipeline comprises the specific processes of opening a first electromagnetic valve 9a, a second electromagnetic valve 9b, a third electromagnetic valve 9C, a vacuum pump 14, a first needle valve 11a and a second needle valve 11b, closing a pressure reducing and stabilizing valve 12 of a diluent gas cylinder 2, and closing an inlet and outlet valve on a C5 insulating liquid storage steel cylinder 1 body; starting the vacuum pump 14, and vacuumizing the pipeline system and the mixed gas storage container 6 except the C5 insulating liquid storage steel cylinder 1, the pipeline system and the diluent gas cylinder 2; when the pressure value of the pressure sensor 13 is 10Pa, the vacuum pumping is stopped.
Calculating the required weight of each component in the mixed gas to be prepared according to the weighing method in the step (2), wherein the specific operation is that the storage container volume, the C5 concentration and the diluent gas concentration of the mixed gas to be prepared are known when the gas is prepared, for example, the mixed gas to be prepared is prepared in advance20L of C5 mixed gas with the pressure of 800kPa and the concentration of 10 percentIf dry air is used as the diluent gas, the molar masses of C5 and diluent gas air are known and are respectively 166 and 29, and the mass of the C5 fluid and the mass of the diluent gas air in the mixed gas to be prepared, namely the weight of C5 and the weight of the diluent gas air, can be calculated through the following formula;
Figure 672355DEST_PATH_IMAGE002
r-gas constant (8.31451J/mol k);
t-ambient temperature in K;
Zftemperature T and pressure PfThe compression coefficient of different gases is within 1 MPa, Zf≈1。
The step (2) of calculating the partial pressure of each component in the mixed gas to be prepared according to the partial pressure principle has the specific operation that,
taking 20L of mixed gas of C5 with 800kPa and 10% concentration as an example for explanation, the partial pressure P of the component C5 in the mixed gas to be prepared in the mixed gas is calculated by the partial pressure principleC5，
PC5=PGeneral assembly*fC5 =800*103 *10%=80*103Pa，
fC5The concentration of the component C5 in the mixed gas is 10 percent;
partial pressure P of diluent gas in mixed gas to be preparedDiluting gas，
PDiluting gas=PGeneral assembly-PC5=800*103-80*103=720*103Pa。
The preparation of the mixed gas in the step (3) comprises the following specific operations,
stabilizing the pressure of the pressure reducing and stabilizing valve to PC5Pressure, opening the second and first solenoid valves 9b, 9a, the diluent gas flows into the top of the C5 liquid storage cylinder 1 through the diluent gas outlet branch line 5, the C5 liquid is pressed into the first heat exchanger 10a to be vaporized, the C5 weight entering the mixed gas storage container 6 is controlled by the combination of the first load cell 16a and the first needle valve 11a, and when the C5 intake air amount is reached, closing the second and first solenoid valves 9b, 9a and the first needle valve 11 a;
then filling the container with the diluent gas, and adjusting the pressure of the pressure reducing and stabilizing valve to PGeneral assemblyThe second needle valve 11b and the second weighing sensor 16b are combined to control the weight of the diluent gas air entering the mixed gas storage container 6, the air inflow amount reaches, and the pressure reducing and stabilizing valve 12 and the second needle valve 11a are closed; the prepared mixed gas is static for 24 hours to ensure that the gas is fully mixed.
A plurality of experiments prove that the concentration deviation of the mixed gas prepared by the combined method is less than 0.3 percent.
In the structure, the pressure reduction and stabilization electromagnetic valve is used for reducing pressure and stabilizing pressure of diluent gas, so that the stability of the gas flow is ensured. The first solenoid valve controls the C5 insulating liquid, the second solenoid valve controls the diluent gas into the C5 insulating liquid storage cylinder; the third electromagnetic valve controls the vacuumizing airflow. The first needle valve controls the flow of the diluent gas and the second needle valve controls the flow of the entrained C5 insulating liquid. The first and second heat exchangers maintain both the diluent gas and the C5 vaporized gas at the same temperature state.
The invention has the advantages that the gas distribution by the combination method of weighing and partial pressure can reduce the gas C5LiquefactionThe problems of low mixed gas pressure, low concentration and the like of preparation can be solved, and the problems of low vapor pressure of C5 gas, slow gas distribution process caused by subsequent temperature reduction and the like can be solved.
Although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: modifications and equivalents may be made thereto without departing from the spirit and scope of the invention and it is intended to cover in the claims the invention as defined in the appended claims.

Claims (8)

1. The C5-PFK mixed gas preparation device based on the weighing and partial pressure combined method is characterized in that: the device comprises a C5 insulating liquid storage steel cylinder, a diluent gas source, a C5 insulating liquid output pipeline, a diluent gas output branch pipeline, a mixed gas storage container, a mixed gas pipeline and a vacuumizing pipeline;
the gas inlet end of the C5 insulating liquid output pipeline is connected with the outlet of the C5 insulating liquid storage steel cylinder and extends to the bottom of the steel cylinder, the gas outlet end of the C5 insulating liquid output pipeline is connected with the gas inlet of the mixed gas pipeline, and a first electromagnetic valve, a first heat exchanger and a first needle valve are sequentially arranged on the C5 insulating liquid output pipeline from the gas inlet end to the gas outlet end;
the gas inlet end of the diluent gas output pipeline is connected with the gas outlet of the diluent gas source, the gas outlet end of the diluent gas output pipeline is also connected with the gas inlet of the mixed gas pipeline, and a pressure reducing and stabilizing valve, a second heat exchanger and a second needle valve are sequentially arranged on the diluent gas output pipeline from the gas inlet end to the gas outlet end;
the gas inlet of the diluent gas output branch pipeline is connected to the gas outlet of a pressure reducing and stabilizing valve on the diluent gas output pipeline, the gas outlet of the diluent gas output branch pipeline is connected with the inlet of a C5 insulating liquid storage steel cylinder, and a second electromagnetic valve is arranged on the diluent gas output branch pipeline;
the gas outlet of the mixed gas pipeline is connected with a mixed gas storage container, and a pressure sensor is arranged on the mixed gas pipeline;
a first weighing device is arranged below the C5 insulating liquid storage steel cylinder.
2. The C5-PFK mixed gas formulating device based on the combined weighing and partial pressure method as claimed in claim 1, wherein: and a second weighing device is arranged below the diluent gas cylinder.
3. The C5-PFK mixed gas formulating device based on the combined weighing and partial pressure method as claimed in claim 1, wherein: the pumping hole of the vacuum pumping pipeline is also connected to the gas inlet of the mixed gas pipeline and is simultaneously communicated with the diluent gas output pipeline and the C5 insulating liquid output pipeline, a third electromagnetic valve and a vacuum pump are arranged on the vacuum pumping pipeline, and the outlet of the vacuum pump is connected with a silencer.
4. The gas distribution method of the C5-PFK mixed gas preparation device based on the combined weighing and partial pressure method as claimed in claim 3, wherein: comprises the following steps of (a) carrying out,
(1) firstly, vacuumizing a container and a pipeline;
(2) calculating the required weight of each component in the mixed gas to be prepared according to a weighing method, and calculating the partial pressure of each component in the mixed gas to be prepared according to a partial pressure principle;
(3) and preparing mixed gas.
5. The dispensing method of the C5-PFK mixed gas dispensing device based on the combined weighing and partial pressure method of claim 4, wherein: vacuumizing the container and the pipeline in the step (1), wherein the specific process is that a first electromagnetic valve, a second electromagnetic valve, a third electromagnetic valve, a vacuum pump, a first needle valve and a second needle valve are opened, a pressure reducing and stabilizing valve of a dilution gas source is closed, and an inlet valve and an outlet valve on a C5 insulating liquid storage steel cylinder body are closed; starting a vacuum pump, and vacuumizing the pipeline system and the mixed gas storage container except the C5 insulating liquid storage steel cylinder, the pipeline system and the diluent gas source; when the pressure value of the pressure sensor is 10Pa, the vacuumizing is stopped.
6. The dispensing method of the C5-PFK mixed gas dispensing device based on the combined weighing and partial pressure method of claim 4, wherein: the required weight of each component in the mixed gas to be prepared is calculated according to a weighing method in the step (2), the specific operation is,
when gas is prepared, the volume of a storage container of mixed gas to be prepared, the concentration of C5 and the concentration of diluent gas are known, the molar mass of C5 and the molar mass of the diluent gas are known, and the mass of each component C5 fluid in the mixed gas to be prepared and the mass of the diluent gas, namely the weight of C5 and the diluent gas, can be calculated through the following formulas;
Figure DEST_PATH_IMAGE001
r-gas constant (8.31451J/mol k);
t-ambient temperature in K;
Zftemperature T and pressure PfCompression factor of 1 MPa, different compression factors corresponding to different gasesWithin, Zf≈1。
7. The dispensing method of the C5-PFK mixed gas dispensing device based on the combined weighing and partial pressure method of claim 4, wherein: calculating the partial pressure of each component in the mixed gas to be prepared according to the partial pressure principle in the step (2), and specifically operating;
calculating partial pressure P of component C5 in the mixed gas to be prepared in the mixed gas by partial pressure principleC5，
PC5=PGeneral assembly*fC5
fC5Is the concentration of component C5 in the mixed gas;
partial pressure P of diluent gas in mixed gas to be preparedDiluting gas，
PDiluting gas=PGeneral assembly-PC5。
8. The dispensing method of the C5-PFK mixed gas dispensing device based on the combined weighing and partial pressure method of claim 4, wherein: the preparation of the mixed gas in the step (3) comprises the following specific operations,
firstly, stabilizing the pressure of the pressure reducing and stabilizing valve to PC5Pressure, opening the second and first solenoid valves, flowing the diluent gas into the top of the C5 liquid storage cylinder through the diluent gas output branch pipe, pressing the C5 liquid into the first heat exchanger for vaporization, controlling the weight of C5 entering the mixed gas storage container through the combination of the first weighing sensor and the first needle valve, and closing the second and first solenoid valves and the first needle valve when the C5 gas inflow is reached;
then filling the container with the diluent gas, and adjusting the pressure of the pressure reducing and stabilizing valve to PGeneral assemblyThe second needle valve and the second weighing sensor are combined to control the weight of the diluent gas air entering the mixed gas storage container, the air inflow amount reaches, and the pressure reducing and stabilizing valve and the second needle valve are closed; the prepared mixed gas is static for 24 hours to ensure that the gas is fully mixed.
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