CN111536414B - High-precision gas filling device and method - Google Patents
High-precision gas filling device and method Download PDFInfo
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- CN111536414B CN111536414B CN202010527503.XA CN202010527503A CN111536414B CN 111536414 B CN111536414 B CN 111536414B CN 202010527503 A CN202010527503 A CN 202010527503A CN 111536414 B CN111536414 B CN 111536414B
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- 238000000034 method Methods 0.000 title claims abstract description 29
- 239000002994 raw material Substances 0.000 claims abstract description 17
- 238000005303 weighing Methods 0.000 claims abstract description 9
- 238000009826 distribution Methods 0.000 claims description 10
- 238000004364 calculation method Methods 0.000 claims description 9
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 229920006395 saturated elastomer Polymers 0.000 claims description 3
- 230000002950 deficient Effects 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000003860 storage Methods 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 97
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 14
- 239000001294 propane Substances 0.000 description 7
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000007787 solid Substances 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
- 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
-
- 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
-
- 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
-
- 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
- F17C2250/043—Pressure
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/32—Hydrogen storage
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The high-precision gas filling device disclosed by the invention is simple in structure, ingenious in design and reasonable in layout. The pressure difference is amplified by a method of reducing the volume of the air storage cavity, so that the accurate control of the filling device at best is realized, and the method for accurately filling by using the device is also disclosed. By utilizing the device to match with the method, the addition of the gas can realize accurate weighing, and meanwhile, compared with the traditional inflation mode, the device can realize accurate inflation on the premise of reducing the inflation times, thereby improving the quality and the efficiency of the inflation; for the gas which is easy to liquefy at normal temperature, the pressure of the gas can be suddenly reduced irregularly, so that the gas filling mode taking the pressure as a reference cannot be realized due to losing the reference standard, the gas can be easily excessively filled only by relying on experience, the defective rate is high, and the device can accurately fill the gas (easy to liquefy at normal temperature); the device can be arbitrarily combined according to the types of the raw material gas, has good universality and can effectively control the manufacturing cost.
Description
Technical Field
The invention relates to the field of gas filling, in particular to a high-precision gas filling device and a method for filling gas by using the device.
Background
As the demand for domestic standard gas markets increases, the quality requirements of standard gas are also becoming increasingly stringent. The deviation of the actual value from the theoretical value by the customer is generally required to be within 5%, even within 2%. The method has the advantages that certain challenges are brought to the preparation of standard gas, human errors in the production process are not negligible, the working efficiency is reduced, and the defective rate is increased.
The existing gas distribution technology and device mainly depend on a pressure gauge to be used as a reference, and the mass of the gas is fixed, however, in actual situations, the relationship between the pressure and the mass of the gas is affected by too many factors, such as temperature (expansion, liquefaction), gas pressure, gas property and the like, so that the gas is often excessively added to exceed the concentration required by a customer, and the weighing of the gas cannot be accurately performed like the accurate weighing of solids, so that accurate filling is difficult to achieve. Meanwhile, once the gas is excessively filled, the excessive part of the gas is uniformly mixed with the gas in the finished gas cylinder and cannot be taken out, so that the finished product has a certain deviation in practice.
There is thus a need for a method or apparatus that solves the above-mentioned problems.
Disclosure of Invention
The invention aims to solve the defects in the prior art, and provides a filling device which can amplify the pressure difference by utilizing a method for reducing the volume of the air storage cavity so as to realize accurate control at best, and also discloses a method for accurately filling by utilizing the device.
The technical scheme of the invention is as follows: a high-precision gas filling device is characterized in that: the device comprises a first pipeline 1, a second pipeline 2 … …, an x pipeline 3 … … and an n pipeline 4 which are sequentially communicated, wherein x and n are natural numbers, x is smaller than n, a ball valve 5 is arranged at the inlet end of each pipeline, a high-precision pressure gauge 6 is arranged on the n pipeline 4, and a vacuumizing branch is further connected to the first pipeline 1.
A method for high precision gas filling using the apparatus as described above, characterized by: the method comprises the following steps:
Firstly, theoretical calculation work before actual operation is carried out, when mg of raw gas needs to be added into the finished gas cylinder 7, the difference delta P between the pressure P in the device pipeline and the existing pressure P1 of the finished gas cylinder 7 is calculated,
①
Wherein M is the relative molecular mass of the raw material gas, V is the total volume of the gas distribution pipeline of the device, 22.4 is the molar volume of ideal gas,
According to the safety requirements, the pressure P in the device pipeline cannot exceed the saturated vapor pressure P0 of the raw material gas, so P < 0.8P0 is taken, and in order to enable the raw material gas to be smoothly filled into the finished gas cylinder 7, Δp is required to be larger than 0.2bar, the two conditions are brought into formula 1, and conversion is carried out, so that the following results can be obtained:
The range of the total volume V of the gas distribution pipeline can be obtained;
According to the total volume V of the gas distribution pipeline, the numerical values of x and n are selected, so that the total volume of the xth pipeline 3, the xth+1th pipeline and the … … th pipeline 4 accords with the range of V,
The total volume of the x-th pipeline 3, the x+1-th pipeline and the … … n-th pipeline 4 is then brought into the calculation formula of DeltaP, and a specific DeltaP value is calculated, namely:
Ending theoretical calculation work;
Then the actual operation is started: weighing the initial weight G0 of the finished gas cylinder 7, connecting the outlet end of the nth pipeline 4 to the finished gas cylinder 7, opening all ball valves 5 on the device, vacuumizing the device by using a vacuumizing branch, connecting the inlet end of the first pipeline 1 to a raw gas source, opening a main valve 8 on the raw gas source pipeline, filling raw gas into each pipeline of the device, observing a high-precision pressure gauge 6 in the process, stopping the pressure in the pipeline until P is reached, and stopping the pressure in the pipeline, wherein P= delta P+P1, then closing ball valves 5 at the front end of the xth pipeline 3, at the moment, the total amount of the raw gas in the xth pipeline 3, the xth pipeline +1and the … … n pipeline 4 is mg raw gas to be filled,
Then the valve mouth on the finished gas cylinder 7 is opened, the raw gas in the x-th pipeline 3, the x+1 pipeline and the … … n pipeline 4 can enter the finished gas cylinder 7, the high-precision pressure gauge 6 is observed in the process, the valve mouth of the finished gas cylinder 7 is closed after the numerical value is stable, the filled finished gas cylinder 7 is weighed to obtain the weight G1, the difference delta G between G1 and G0 is calculated and compared with m, and if the deviation between delta G and m is within 2%, the filling is completed.
Compared with the prior art, the invention has the following advantages:
The high-precision gas filling device in the structural form is simple in structure, ingenious in design and reasonable in layout. The pressure difference is amplified by a method of reducing the volume of the air storage cavity, so that the accurate control of the filling device at best is realized, and the method for accurately filling by using the device is also disclosed. The gas adding device can realize accurate weighing of the gas adding, and if 1g of gas is needed to be added, the adding amount can be controlled within 1 g+/-2%, so that excessive adding is prevented. Meanwhile, compared with the traditional inflation mode, on the premise of reducing the inflation times, the accurate inflation can be realized, and the quality and the efficiency of inflation are improved; for the gas which is easy to liquefy at normal temperature, the pressure of the gas can be suddenly reduced irregularly, so that the gas filling mode taking the pressure as a reference cannot be realized due to losing the reference standard, the gas can be easily excessively filled only by relying on experience, the defective rate is high, and the device can accurately fill the gas (easy to liquefy at normal temperature); the device can be arbitrarily combined according to the types of the raw material gas, has good universality and can effectively control the manufacturing cost.
Therefore, the gas filling device has various advantages, is particularly suitable for popularization and application in the field, and has very broad market prospect.
Drawings
Fig. 1 is a schematic structural view of a filling device according to an embodiment of the present invention.
Detailed Description
Specific embodiments of the present invention will be described below with reference to the accompanying drawings. As shown in fig. 1: the utility model provides a high accuracy gas filling device, it includes the first pipeline 1 that communicates in proper order, second pipeline 2 … … x pipeline 3 … … n pipeline 4, and wherein x, n are natural number, and x is less than n, and the entry end of every pipeline all is provided with ball valve 5, is provided with high accuracy manometer 6 on n pipeline 4, still be connected with the evacuation branch road on the first pipeline 1.
A method for high precision gas filling using the apparatus as described above, comprising the steps of:
Firstly, theoretical calculation work before actual operation is carried out, when mg of raw gas needs to be added into the finished gas cylinder 7, the difference delta P between the pressure P in the device pipeline and the existing pressure P1 of the finished gas cylinder 7 is calculated,
①
Wherein M is the relative molecular mass of the raw material gas, V is the total volume of the gas distribution pipeline of the device, 22.4 is the molar volume of ideal gas,
According to the safety requirements, the pressure P in the device pipeline cannot exceed the saturated vapor pressure P0 of the raw material gas, so P < 0.8P0 is taken, and in order to enable the raw material gas to be smoothly filled into the finished gas cylinder 7, Δp is required to be larger than 0.2bar, the two conditions are brought into formula 1, and conversion is carried out, so that the following results can be obtained:
The range of the total volume V of the gas distribution pipeline can be obtained;
According to the total volume V of the gas distribution pipeline, the numerical values of x and n are selected, so that the total volume of the xth pipeline 3, the xth+1th pipeline and the … … th pipeline 4 accords with the range of V,
The total volume of the x-th pipeline 3, the x+1-th pipeline and the … … n-th pipeline 4 is then brought into the calculation formula of DeltaP, and a specific DeltaP value is calculated, namely:
Ending theoretical calculation work;
Then the actual operation is started: weighing the initial weight G0 of the finished gas cylinder 7, connecting the outlet end of the nth pipeline 4 to the finished gas cylinder 7, opening all ball valves 5 on the device, vacuumizing the device by using a vacuumizing branch, connecting the inlet end of the first pipeline 1 to a raw gas source, opening a main valve 8 on the raw gas source pipeline, filling raw gas into each pipeline of the device, observing a high-precision pressure gauge 6 in the process, stopping the pressure in the pipeline until P is reached, P= delta P+P1, closing the ball valves 5 at the front end of the xth pipeline 3, at the moment, the total amount of the raw gas in the xth pipeline 3, the xth+1pipeline and the … … n pipeline 4 is the mg raw gas to be filled,
Then the valve mouth on the finished gas cylinder 7 is opened, the raw gas in the x-th pipeline 3, the x+1 pipeline and the … … n pipeline 4 can enter the finished gas cylinder 7, the high-precision pressure gauge 6 is observed in the process, the valve mouth of the finished gas cylinder 7 is closed after the numerical value is stable, the filled finished gas cylinder 7 is weighed to obtain the weight G1, the difference delta G between G1 and G0 is calculated and compared with m, and if the deviation between delta G and m is within 2%, the filling is completed.
Embodiment one:
For example, 2g of propane is to be added by the present device to a finished gas cylinder 7 already filled with other gases. Firstly, calculating the pressure required to be added according to a gas engineering formula: Firstly weighing the initial weight of the finished gas cylinder 7 to be G Initially, the method comprises = 7843.61G, connecting the finished gas cylinder 7 with a propane gas source through the device, opening all ball valves 5 on the device and vacuumizing the device, slowly opening a total valve 8 on the raw gas source, directly filling the finished gas cylinder 7 with propane gas, and in order to avoid excessive addition, closing the total valve 8 when the pressure difference is about 0.1bar because the pressure difference is calculated to be 0.13bar, recording the value of 0.1bar on a high-precision pressure gauge 6 at the moment, closing a valve mouth of the finished gas cylinder 7, weighing the finished gas cylinder 7 again when the weight of the finished gas cylinder 7 is G In (a) = 7845.45G, adding propane with the weight of G Initially, the method comprises -G In (a) = 1.84G, and controlling the adding precision of the finished gas cylinder by the device and the method because the adding quantity is difficult to control by adopting the traditional method;
As the volume of each pipeline is fixed once selected, the work to be done in actual work is to select the number of pipelines according to the range of V,
For example, the range of V is calculated to be 0.3-0.5L, so that when the device is composed of four pipes with a volume of 0.2L, the last two pipes, i.e., x=3, n=4, can be selected, and the total volume of the two pipes is 0.2+0.2=0.4L, which is within the range of V;
Under the same conditions (V in the range of 0.3-0.5L), when the device consists of six pipes with a volume of 0.1L, the third to sixth pipes can be selected, i.e. x=3, n=6, the total volume of these four pipes being 0.1+0.1+0.1+0.1=0.4L, within the range of V;
It should be noted that the range of V calculated by the conversion formula of formula 1 is not a final determination value, but it is determined how many pipes need to be selected by finding the range of V, as long as the total volume of the finally selected pipes is within the range of V;
The range of V is first calculated according to the conversion formula of formula 1: 0.017-0.4L, in this example three pipes with a volume of 0.1L are connected together, so taking x=2, n=3, i.e. the 2 nd pipe and the 3 rd pipe are used for accurate inflation, the total volume of the two pipes is 0.2L,
Vacuumizing each pipeline in the device again, opening a main valve 8, filling raw material gas into the device, observing a high-precision pressure gauge 6 in the process, closing the main valve 8 after the pressure reaches 0.5bar (the pressure is amplified to 0.4bar and is easy to control), at the moment, delta P reaches a calculated value of 0.4bar (0.5-0.1=0.4 bar), closing a ball valve 2 at the front end of a 2 nd pipeline, at the moment, the total amount of propane in the 2 nd pipeline and a 3 rd pipeline is 0.16g, opening a valve mouth of a finished gas bottle 7, introducing propane in the 2 nd pipeline and the 3 rd pipeline into the finished gas bottle 7 under the action of pressure difference, and closing the valve mouth of the finished gas bottle 7 after the numerical value of the high-precision pressure gauge 6 is stable, so as to finish final accurate addition;
The finished gas cylinder 7 is weighed again to obtain G Terminal (A) = 7845.62G, and the total adding amount of propane twice is G Terminal (A) -G Initially, the method comprises =2.01G, and the deviation between the adding amount and the target adding weight of 2G is 0.5%, so that the requirement is met.
Claims (1)
1. A high-precision gas filling method is characterized in that: the method comprises the following steps:
Preparing a high-precision gas filling device, wherein the device comprises a first pipeline (1), a second pipeline (2) … …, an xth pipeline (3) … … and an nth pipeline (4) which are sequentially communicated, wherein x and n are natural numbers, x is smaller than n, the inlet end of each pipeline is provided with a ball valve (5), the nth pipeline (4) is provided with a high-precision pressure gauge (6), the first pipeline (1) is also connected with a vacuumizing branch,
Then theoretical calculation work before actual operation is carried out, when mg of raw gas needs to be added into the finished gas cylinder (7), the difference delta P between the pressure P in the device pipeline and the existing pressure P1 of the finished gas cylinder (7) is calculated,
Wherein M is the relative molecular mass of the raw material gas, V is the total volume of the gas distribution pipeline of the device, 22.4 is the molar volume of ideal gas,
According to the safety requirements, the pressure P in the device pipeline cannot exceed the saturated vapor pressure P0 of the raw material gas, so P is less than 0.8P0, and in order to enable the raw material gas to be smoothly filled into a finished gas cylinder (7), delta P is required to be more than 0.2bar, the two conditions are brought into a formula 1, and conversion is carried out, so that the following results can be obtained:
The range of the total volume V of the gas distribution pipeline can be obtained;
According to the total volume V of the gas distribution pipeline, the numerical values of x and n are selected, so that the total volume of the x-th pipeline (3), the x+1th pipeline and the … … n-th pipeline (4) accords with the range of V,
Then the total volume of the x-th pipeline (3), the x+1-th pipeline and the … … n-th pipeline (4) is brought into a calculation formula of DeltaP, and a specific DeltaP value is calculated, namely:
Ending theoretical calculation work;
Then the actual operation is started: weighing the initial weight G0 of a finished gas cylinder (7), connecting the outlet end of an nth pipeline (4) to the finished gas cylinder (7), opening all ball valves (5) on the device, vacuumizing the device by using a vacuumizing branch, connecting the inlet end of a first pipeline (1) to a raw material gas source, opening a main valve (8) on a raw material gas source pipeline, pouring raw material gas into each pipeline of the device, observing a high-precision pressure gauge (6) in the process, stopping the pressure in the pipeline after P, and closing a ball valve (5) at the front end of an xth pipeline (3), wherein the total amount of raw material gas in the xth pipeline (3), the xth pipeline (1) and the … … (4) is mg raw material gas to be filled,
Then, a valve nozzle on the finished gas cylinder (7) is opened, raw gas in an x-th pipeline (3), an x+1 pipeline and a … … n pipeline (4) can enter the finished gas cylinder (7), a high-precision pressure gauge (6) is observed in the process, the valve nozzle of the finished gas cylinder (7) is closed after the numerical value is stable, the filled finished gas cylinder (7) is weighed to obtain the weight G1, the difference delta G between the G1 and the G0 is calculated and compared with m, and if the deviation between the delta G and the m is within 2%, the filling is completed.
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| CN212377757U (en) * | 2020-06-11 | 2021-01-19 | 大连大特气体有限公司 | High-precision gas filling device |
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