CN112461889A - Hydrogen composite gas explosion limit test system and test method - Google Patents
Hydrogen composite gas explosion limit test system and test method Download PDFInfo
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- CN112461889A CN112461889A CN202011170055.9A CN202011170055A CN112461889A CN 112461889 A CN112461889 A CN 112461889A CN 202011170055 A CN202011170055 A CN 202011170055A CN 112461889 A CN112461889 A CN 112461889A
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/50—Investigating or analyzing materials by the use of thermal means by investigating flash-point; by investigating explosibility
- G01N25/54—Investigating or analyzing materials by the use of thermal means by investigating flash-point; by investigating explosibility by determining explosibility
Abstract
The system comprises a test bed, an explosion limit testing device and a dynamic gas distribution system, wherein the dynamic gas distribution system is connected with the explosion limit testing device, and the explosion limit testing device is arranged on the test bed, so that the explosion phenomenon can be judged, and the accurate evaluation of the explosion performance of the composite gas is realized.
Description
Technical Field
The invention relates to the field of measurement, in particular to a hydrogen composite gas explosion limit testing system and a testing method.
Background
In the existing composite gas explosion limit test method, the gas preparation process is generally prepared by adopting a partial pressure method, namely, the concentration of each component in the composite gas is determined according to the proportion of the respective pressure. The method is simple and convenient, but the problem of poor repeatability and accuracy of gas distribution is easily caused by poor pressure and control accuracy in the gas distribution process; the gas explosion phenomenon is judged by basically observing flame propagation mode at present, but when the involved combustible gas is hydrogen, the flame burnt in the air is light blue, and the flame propagation speed is very high, so the phenomenon is difficult to observe, and the error of the explosion limit test result is large.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides a hydrogen composite gas explosion limit testing system and a testing method, designs an explosion phenomenon judgment scheme and achieves the purpose of accurately evaluating the explosion performance of the composite gas.
The invention provides a hydrogen composite gas explosion limit testing system which comprises a test bed, an explosion limit testing device and a dynamic gas distribution system, wherein the dynamic gas distribution system is connected with the explosion limit testing device, and the explosion limit testing device is arranged on the test bed;
the explosion limit testing device comprises a detonation box, and a gas flow meter, a fire retardant device, a mixer and a testing pipe which are sequentially connected, wherein the gas flow meter, the fire retardant device and the mixer are arranged outside the detonation box, and the testing pipe is arranged inside the detonation box; the test tube comprises an ignition electrode arranged in the test tube, and a plurality of first temperature measurement sensors which are arranged at the central positions in the test tube and are used for measuring the temperature of combustion flame; the upper part and the lower part which are at equal distance from the center of the test tube are respectively provided with a transverse temperature measuring channel which is vertical to the test tube and is communicated with the interior of the test tube, each temperature measuring channel is provided with a plurality of second temperature measuring sensors which are arranged at equal intervals, wherein the arrangement interval of the second temperature measuring sensors in the upper temperature measuring channel is larger than that of the lower temperature measuring channel; the test tube has an inner diameter which is gradually decreased from bottom to top in a small range;
and the dynamic gas distribution system is used for configuring the hydrogen multi-component inhibitor composite gas, mixing the composite gas and air according to a certain proportion and transmitting the mixture to the explosion limit testing device.
Wherein, explosion limit testing arrangement fixes in the explosion-proof safety box of metal material.
Wherein, the temperature sensor is a thermocouple.
The invention also provides a method for testing the explosion limit of the hydrogen composite gas, which is realized by utilizing the system for testing the explosion limit of the hydrogen composite gas and comprises the following steps of:
(1) checking the air tightness of the test system, vacuumizing the test tube to 668Pa of vacuum degree by using a vacuum pump, then stopping the pump, and after 5min, reducing the reading of a pressure gauge to be not more than 267Pa, and considering that the vacuum degree meets the requirement;
(2) preparing hydrogen multi-component inhibitor composite gas, pre-calculating the volume of each gas according to the concentration required by an experiment, proportionally mixing the gases with corresponding volumes, and introducing the mixed gases into a test tube;
(3) monitoring whether the pressure change in the test tube conforms to a gas partial pressure law or not;
(4) stirring the mixed gas for 5-10 min by using a stirring pump so as to uniformly distribute the mixture of the combustible gas and the air in the test tube and avoid the occurrence of concentration gradient;
(5) opening a safety relief valve at the bottom of the test tube after the pump is stopped to perform ignition operation, and judging the explosion phenomenon; meanwhile, observing whether the ignited flame can move to the top of the test tube rapidly or slowly, and observing whether the temperature of each thermocouple measuring point changes or not through a patrol instrument if the flame cannot be observed by naked eyes;
wherein, still specifically include: and judging whether the explosion phenomenon occurs or not based on the plurality of measured temperatures of the upper and lower transverse temperature measuring channels after ignition by using a plurality of second temperature measuring sensors arranged in the upper and lower transverse temperature measuring channels respectively.
(6) After the experiment, the tube wall and the electrode surface are washed by dry clean air, if the tube wall and the electrode surface are polluted, the tube wall and the electrode surface are cleaned in time, and if the condensation water appears, the tube wall and the electrode surface are dried by air and then the next experiment is carried out.
The explosion phenomenon is judged in the step (5), and specifically, the explosion reaction temperature is measured by adopting a plurality of first temperature measurement sensors arranged at the central positions, and whether the explosion phenomenon occurs or not is qualitatively judged by measuring the temperature change of the first temperature measurement sensors.
Wherein, the step (5) further comprises:
a) if, upon ignition, a distinct flame is observed, the flame can propagate rapidly or slowly from the bottom to the top of the tube, an explosion is considered to have occurred, otherwise no explosion is considered to have occurred;
b) if no obvious flame can be observed during ignition, after ignition, if the temperature of the measuring point changes suddenly, the explosion is considered to occur, otherwise, the explosion is not considered to occur.
Wherein, the step (5) further comprises: the temperature jump of the measuring point closest to the top of the test tube in the plurality of first temperature measuring sensors is used as a judgment basis, and the position of the flame spread to the test tube after specific ignition is determined according to whether the temperature jump occurs in other first temperature measuring sensors.
The process for preparing the hydrogen multi-component inhibitor composite gas in the step (2) specifically comprises the following steps:
a) connecting a plurality of raw material gas cylinders with a gas distribution device arranged in the dynamic gas distribution system through first transmission channels respectively, and connecting a gas cylinder to be filled with the gas distribution device through a second transmission channel; wherein, two sections of sub-transmission channels are arranged in the first transmission channel;
b) heating and pressurizing the raw material gas entering the front section conveying channel in the conveying process, wherein the heating temperature is 65 ℃, and the pressure is 1.5 times of the standard set pressure value of the raw material gas cylinder; carrying out constant-heat pressure reduction on the raw material gas entering the rear-section transmission channel during transmission, wherein the constant temperature is 60 ℃, and the pressure is 1.3 times of the standard set pressure value of the raw material gas;
c) filling the component gas in each raw material gas cylinder passing through the first transmission channel into the gas cylinder to be filled through the second transmission channel to a required first pressure value according to the pre-calculated pressure by using a gas distribution device, and then unloading the gas cylinder to be filled and weighing again;
d) connecting the gas cylinder to be filled with the component gas into a high-pressure system, repeatedly flushing the pipeline by using diluent gas, and filling the diluent gas into the gas cylinder to be filled to a required second pressure value;
e) keeping the ambient temperature stable at 34 ℃ for at least 20 minutes, standing the filled gas cylinder at the ambient temperature for 45 minutes, and weighing the total mass of the filled gas cylinder and the mixed gas by using a weighing device after the temperature is balanced;
f) calculating the content of the prepared standard gas based on the total mass of the gas cylinder to be filled and the mixed gas and the empty cylinder mass of the gas cylinder to be filled;
g) and uniformly mixing the standard gas in the gas filling cylinder by using a gas mixing device.
According to the hydrogen composite gas explosion limit testing system and the testing method, an explosion phenomenon judgment scheme is designed, the purpose of accurately evaluating the explosion performance of the composite gas is achieved, and the middle part and the temperature measuring devices in the transverse temperature measuring channels are arranged in the testing pipe at the same time, so that the explosion phenomenon can be judged better and accurately.
Drawings
FIG. 1 is a diagram of a hydrogen composite gas explosion limit test system;
FIG. 2 is a schematic structural diagram of a hydrogen composite gas explosion limit testing system;
fig. 3 is a flow chart of a method for testing the explosion limit of the hydrogen composite gas.
Detailed Description
Reference will now be made in detail to the embodiments of the present invention, the following examples of which are intended to be illustrative only and are not to be construed as limiting the scope of the invention.
The invention provides a hydrogen composite gas explosion limit testing system and a testing method, the specific structure and flow are respectively shown as the accompanying drawings 1-3, wherein in fig. 2, the specific reference numbers represent: firstly, a dynamic gas distribution system; ② a gas flowmeter; ③ a fire retardant device; fourthly, a mixer; initiating box; sixthly, testing the tube; seventhly, an ignition electrode; eighthly, a first temperature measuring sensor; ninthly-a second temperature measuring sensor; explosion limit test apparatus, described in detail below.
For the composite gas explosion limit testing device, the principle of the explosion limit testing device is as follows: and the gases such as hydrogen, helium and the like enter the test bed according to a certain proportion after passing through the flowmeter, enter the test tube through the fire retardant device and the mixer, operate the detonation box and burn and explode the mixed gas. The main explosion limit testing device mainly comprises several parts: the test bed, the detonation box, the air source, the test tube, the gas distribution system, the partial pressure fire retardant system and the like. Several thermocouples were placed in the reaction tube of the test apparatus centrally above the ignition electrode to measure the combustion flame temperature. The device main body is fixed in an explosion-proof safety box made of metal materials, and all parts of the device are connected through rubber pipes. The upper part and the lower part which are away from the center of the test tube by equal distances are respectively provided with a transverse temperature measuring channel which is perpendicular to the test tube and is communicated with the interior of the test tube, each temperature measuring channel is provided with a plurality of temperature measuring sensors which are arranged at equal intervals, the arrangement interval of the temperature measuring sensors in the upper temperature measuring channel is larger than that of the lower temperature measuring channel, and the temperature measuring sensors are thermocouples. Because the reaction temperature during explosion is high, the flame propagation speed is very fast, the contact time of flame and a thermocouple is very short, the speed is very fast in the pipe diameter direction of the test pipe, and the measurement difference cannot be reflected, so that a transverse temperature measurement channel is arranged up and down, the flame part which is laterally propagated transversely is relatively less and relatively slow, and the judgment can be better carried out through the measurement in the direction measurement. In order to ensure the propagation of the lateral flame, the test tube is designed to have an inner diameter which decreases gradually from bottom to top, but the decreasing amplitude cannot be too large, so that the bottom angle range of the trapezoid formed by the section is selected to be 85-88 degrees.
And for the dynamic gas distribution system of the composite gas explosion limit device, designing a dynamic gas distribution system according to the proportion of each component in the hydrogen multi-component inhibitor composite gas obtained under the test condition. A high-precision dynamic gas distribution device is developed, and a mass flow controller is used for controlling the gas flow proportion to continuously prepare mixed gas. The set value of the flow controller is adjusted to a preset value, and the gas with different concentrations is continuously and quickly prepared by selecting a proper mass flow controller combination. In the process of gas distribution, the gas distribution mode of the hydrogen multi-component inhibitor composite gas is adopted, and the specific implementation process is as follows: for the gas cylinder treatment process, firstly, the gas cylinder is connected to a gas cylinder cleaning device, a heating sleeve is wrapped outside the cylinder wall, the temperature of the heating sleeve is set to be 50 ℃, vacuum treatment is carried out through a high-vacuum molecular pump group, the heating time is not less than 12 hours, the vacuum treatment time is not less than 24 hours, and finally the vacuum degree in the gas cylinder is less than 2 multiplied by 10-5Pa。
In the preparation process, the method comprises the following steps which are carried out in sequence: checking whether the connection positions of the raw material gas cylinders and the standard gas cylinders are correct or not, and whether all valves on the gas distribution table are in correct opening and closing states or not, and if so, entering the next step; connecting the treated gas cylinder to be filled into a low-pressure system, opening a valve of the gas cylinder to be filled under the condition of ensuring no leakage, and vacuumizing to 5 x 10-3Pa; unloading the gas cylinder to be filled, wiping the outer wall of the gas cylinder to be filled with dry cloth, and weighing the empty gas cylinder mass of the gas cylinder to be filled in a weighing device; the weighed filling gas cylinder is connected into a low-pressure system and pumped to 5 multiplied by 10-3Pa, opening a valve of the gas cylinder to be filled to check whether the vacuum degree meets the condition, entering the next step if the vacuum degree meets the condition, and returning to the previous step if the vacuum degree does not meet the condition; analyzing the raw materials in the raw material gas cylinders to respectively obtain corresponding analysis indexes, wherein the raw material gas cylinders are respectively filled with helium, trifluoromethane and hydrogen; connecting each raw material gas cylinder with a gas distribution device through a first transmission channel, and connecting a gas cylinder to be filled with the gas distribution device through a second transmission channel; wherein two sections of sub-transmission channels are arranged in the first transmission channel in such a wayThe raw material gas can be ensured to pass through two different treatment stages in the transmission process, reasonable pressure and temperature are set, the transmission volume of the gas is ensured during transmission, and the gas is properly compressed and expanded, so that the transmission rate can be effectively improved, the transmission time is reduced, and the efficiency is improved; heating and pressurizing the raw material gas entering the front-section conveying channel in conveying, wherein the heating temperature is 65 ℃, and the pressure is 1.5 times of the standard set pressure value of the raw material gas cylinder; the constant heat decompression is carried out on the raw material gas entering the rear-section transmission channel during transmission, the constant temperature is 60 ℃, the pressure is 1.3 times of the standard set pressure value of the raw material gas, in the process, the selection of temperature and pressure is particularly important, if the selection is not proper, reasonable compression and expansion cannot be generated, thereby not increasing the transmission rate, and based on the selection of the heating temperature of 65 ℃, the transmission temperature can be rapidly increased, the expansion of the gas can be ensured, and improves the activity of the gas, simultaneously improves the standard set pressure value of the raw material gas cylinder (namely the standard set pressure value of the raw material gas cylinder after being originally filled) by 1.5 times to properly compress the expanded gas, thus, the gas achieves a dynamic expansion and compression process, and the gas are mutually restricted in the dynamic process, so that the activity of the gas can be improved, and the gas can be transmitted at an improved transmission rate; in the rear-section transmission channel, because a gas distribution device is required to enter, stable gas distribution parameters are required to be properly ensured, the raw material gas processed by the front end cannot change the conditions suddenly, otherwise, the gas distribution is unfavorable, the rear-section transmission channel is arranged, the selection of the temperature and the pressure at the moment is also particularly important, the rear-section transmission channel is matched with the parameters of the front-end transmission channel and is also required to ensure the matching of the subsequent conditions, the constant temperature of the rear-end transmission channel is 60 ℃ after being stabilized for 10 minutes, the pressure is 1.3 times of the standard set pressure value of the raw material gas, the reduction of the temperature can enable the gas to be stable but not change the conditions suddenly, the proper reduction of the pressure enables the gas after being compressed and expanded to be released in proper volume, the stability is improved, and the parameters of the front channel and the rear channel are matched, so that. The component gases in the raw material gas cylinders passing through the first transmission channel pass through a gas distribution device according to the pre-calculated pressureAfter the gas cylinder to be filled is filled in the second transmission channel to reach the required first pressure value, the gas cylinder to be filled is unloaded and weighed again; connecting the gas cylinder to be filled with the component gas to a high-pressure system, repeatedly flushing the pipeline by using diluent gas, and filling the diluent gas into the filled gas cylinder to a required second pressure value; different pressure values correspond to different filling stages and are therefore more stable. Keeping the ambient temperature stable at 34 ℃ for at least 20 minutes, standing the filled gas cylinder at the ambient temperature for 45 minutes, and weighing the total mass of the filled gas cylinder and the mixed gas by using a weighing device after the temperature is balanced; such conditions are based on the gas distribution parameters before matching, so that the weighing under the environment is more accurate and can be higher, and the precision is effectively improved. Calculating the content of the prepared standard gas based on the total mass of the gas cylinder to be filled and the mixed gas and the empty cylinder mass of the gas cylinder to be filled;
for the explosion phenomenon judgment scheme, a thermocouple is adopted to measure the explosion reaction temperature, and whether the explosion phenomenon occurs or not is qualitatively judged by measuring the temperature change of the thermocouple. Several thermocouples were placed centrally within the tube above the ignition electrode to measure the explosion reaction temperature. Because the flame propagation speed is high and the contact time between the flame and the thermocouple is short, the thermocouple cannot accurately measure the actual explosion temperature at each measuring point, and the main purpose is to qualitatively judge whether the explosion phenomenon occurs or not by measuring the temperature change.
The method for judging the explosion phenomenon in the scheme comprises the following steps: (1) under the condition that obvious flame can be observed during ignition, if the flame can quickly or slowly spread to the top of the tube from the bottom after ignition, the explosion is considered to occur, otherwise, the explosion is not considered to occur; (2) and under the condition that obvious flame cannot be observed during ignition, if the temperature of the measuring point is suddenly changed after ignition, the explosion is considered to be generated, and otherwise, the explosion is not considered to be generated.
In the experiment, only the temperature mutation of the measuring point 1 closest to the top of the tube in a plurality of (preferably 4) measuring points is taken as a judgment basis, and in the scheme of 4 measuring points, other 3 measuring points still have reference functions. In the actual test process, the situation that flame is neither completely incapable of being ignited nor continuously spread to the top of the tube after the mixed gas with certain proportion is ignited often occurs, and it is determined that no explosion occurs at this moment, but the specific spread position can be determined according to whether temperature mutation occurs at other 3 measuring points, so that the concentration of the next group of experiments can be adjusted more accurately.
For the composite gas explosion limit performance test, the composite gas and air are mixed according to a certain proportion through the built explosion device, and then the electric spark is used for ignition to evaluate the explosiveness of the composite gas. The test comprises the following specific steps:
a) checking the airtightness of the experimental device, vacuumizing the reaction tube to 668Pa (5mmHg) vacuum degree by using a vacuum pump, then stopping the pump, and reading by a pressure gauge after 5min until the vacuum degree is not more than 267Pa (2mmHg), wherein the vacuum degree is considered to meet the requirement.
b) The volume of each gas is calculated in advance according to the concentration required by the experiment, the gas with the corresponding volume is introduced into the glass reaction tube in proportion, and whether the pressure change in the tube conforms to the law of partial pressure of the gas is monitored through a pressure gauge.
c) After the gas is prepared, the mixture is stirred for 5-10 min by using a stirring pump so as to uniformly distribute the combustible gas and the air mixture in the pipe, and the concentration gradient is avoided as much as possible.
d) And opening a safety relief valve at the bottom of the reaction tube after the pump is stopped to perform ignition operation, simultaneously observing whether the ignited flame can rapidly or slowly move to the top of the tube, and immediately observing whether the temperature of each thermocouple measuring point changes through a patrol instrument if the flame cannot be observed by naked eyes.
e) After each experiment, the experimental device is washed by dried clean air, and the glass tube wall and the electrode surface are cleaned in time if the glass tube wall and the electrode surface are polluted. Since the hydrogen gas is burnt to generate water vapor, condensed water may be formed on the surface of the tube wall, and the next experiment is carried out after the condensed water is dried.
Although exemplary embodiments of the present invention have been described for illustrative purposes, those skilled in the art will appreciate that various modifications, additions, substitutions and the like can be made in form and detail without departing from the scope and spirit of the invention as disclosed in the accompanying claims, all of which are intended to fall within the scope of the claims, and that various steps in the various sections and methods of the claimed product can be combined together in any combination. Therefore, the description of the embodiments disclosed in the present invention is not intended to limit the scope of the present invention, but to describe the present invention. Accordingly, the scope of the present invention is not limited by the above embodiments, but is defined by the claims or their equivalents.
Claims (8)
1. The utility model provides a hydrogen composite gas explosion limit test system, includes test bench, explosion limit testing arrangement and dynamic gas distribution system, its characterized in that: the dynamic gas distribution system is connected with an explosion limit testing device, and the explosion limit testing device is arranged on the experiment table;
the explosion limit testing device comprises a detonation box, and a gas flow meter, a fire retardant device, a mixer and a testing pipe which are sequentially connected, wherein the gas flow meter, the fire retardant device and the mixer are arranged outside the detonation box, and the testing pipe is arranged inside the detonation box; the test tube comprises an ignition electrode arranged in the test tube, and a plurality of first temperature measurement sensors which are arranged at the central positions in the test tube and are used for measuring the temperature of combustion flame; the upper part and the lower part which are at equal distance from the center of the test tube are respectively provided with a transverse temperature measuring channel which is vertical to the test tube and is communicated with the interior of the test tube, each temperature measuring channel is provided with a plurality of second temperature measuring sensors which are arranged at equal intervals, wherein the arrangement interval of the second temperature measuring sensors in the upper temperature measuring channel is larger than that of the lower temperature measuring channel; the test tube has an inner diameter which is gradually decreased from bottom to top in a small range;
and the dynamic gas distribution system is used for configuring the hydrogen multi-component inhibitor composite gas, mixing the composite gas and air according to a certain proportion and transmitting the mixture to the explosion limit testing device.
2. The system of claim 1, wherein: the explosion limit testing device is fixed in an explosion-proof safety box made of metal materials.
3. The system of claim 2, wherein: the temperature measuring sensor is a thermocouple.
4. A method for testing the explosion limit of a hydrogen composite gas, which is implemented by using the system for testing the explosion limit of a hydrogen composite gas as claimed in any one of claims 1 to 3, and is characterized by comprising the following steps which are sequentially carried out:
(1) checking the air tightness of the test system, vacuumizing the test tube to 668Pa of vacuum degree by using a vacuum pump, then stopping the pump, and after 5min, reducing the reading of a pressure gauge to be not more than 267Pa, and considering that the vacuum degree meets the requirement;
(2) preparing hydrogen multi-component inhibitor composite gas, pre-calculating the volume of each gas according to the concentration required by an experiment, proportionally mixing the gases with corresponding volumes, and introducing the mixed gases into a test tube;
(3) monitoring whether the pressure change in the test tube conforms to a gas partial pressure law or not;
(4) stirring the mixed gas for 5-10 min by using a stirring pump so as to uniformly distribute the mixture of the combustible gas and the air in the test tube and avoid the occurrence of concentration gradient;
(5) opening a safety relief valve at the bottom of the test tube after the pump is stopped to perform ignition operation, and judging the explosion phenomenon; meanwhile, observing whether the ignited flame can move to the top of the test tube rapidly or slowly, and observing whether the temperature of each thermocouple measuring point changes or not through a patrol instrument if the flame cannot be observed by naked eyes;
the device specifically comprises a plurality of second temperature measurement sensors which are respectively arranged by utilizing the upper and lower transverse temperature measurement channels, and judges whether the explosion phenomenon occurs or not based on a plurality of measured temperatures of the upper and lower transverse temperature measurement channels after ignition;
(6) after the experiment, the tube wall and the electrode surface are washed by dry clean air, if the tube wall and the electrode surface are polluted, the tube wall and the electrode surface are cleaned in time, and if the condensation water appears, the tube wall and the electrode surface are dried by air and then the next experiment is carried out.
5. The method of claim 4, wherein: and (5) judging the explosion phenomenon, specifically, measuring the explosion reaction temperature by adopting a plurality of first temperature measurement sensors arranged at the central positions, and qualitatively judging whether the explosion phenomenon occurs or not by measuring the temperature change of the first temperature measurement sensors.
6. The method of claim 5, wherein: the step (5) further comprises:
a) if, upon ignition, a distinct flame is observed, the flame can propagate rapidly or slowly from the bottom to the top of the tube, an explosion is considered to have occurred, otherwise no explosion is considered to have occurred;
b) if no obvious flame can be observed during ignition, after ignition, if the temperature of the measuring point changes suddenly, the explosion is considered to occur, otherwise, the explosion is not considered to occur.
7. The method of claim 6, wherein: the step (5) further comprises: the temperature jump of the measuring point closest to the top of the test tube in the plurality of first temperature measuring sensors is used as a judgment basis, and the position of the flame spread to the test tube after specific ignition is determined according to whether the temperature jump occurs in other first temperature measuring sensors.
8. The method of claim 7, wherein: the process for preparing the hydrogen multi-component inhibitor composite gas in the step (2) specifically comprises the following steps:
a) connecting a plurality of raw material gas cylinders with a gas distribution device arranged in the dynamic gas distribution system through first transmission channels respectively, and connecting a gas cylinder to be filled with the gas distribution device through a second transmission channel; wherein, two sections of sub-transmission channels are arranged in the first transmission channel;
b) heating and pressurizing the raw material gas entering the front section conveying channel in the conveying process, wherein the heating temperature is 65 ℃, and the pressure is 1.5 times of the standard set pressure value of the raw material gas cylinder; carrying out constant-heat pressure reduction on the raw material gas entering the rear-section transmission channel during transmission, wherein the constant temperature is 60 ℃, and the pressure is 1.3 times of the standard set pressure value of the raw material gas;
c) filling the component gas in each raw material gas cylinder passing through the first transmission channel into the gas cylinder to be filled through the second transmission channel to a required first pressure value according to the pre-calculated pressure by using a gas distribution device, and then unloading the gas cylinder to be filled and weighing again;
d) connecting the gas cylinder to be filled with the component gas into a high-pressure system, repeatedly flushing the pipeline by using diluent gas, and filling the diluent gas into the gas cylinder to be filled to a required second pressure value;
e) keeping the ambient temperature stable at 34 ℃ for at least 20 minutes, standing the filled gas cylinder at the ambient temperature for 45 minutes, and weighing the total mass of the filled gas cylinder and the mixed gas by using a weighing device after the temperature is balanced;
f) calculating the content of the prepared standard gas based on the total mass of the gas cylinder to be filled and the mixed gas and the empty cylinder mass of the gas cylinder to be filled;
g) and uniformly mixing the standard gas in the gas filling cylinder by using a gas mixing device.
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