An automated sampling device and method

Abstract

The application belongs to the technical field of sampling in uranium enrichment process, and particularly relates to an automatic sampling device and method. The device comprises a sampling device inlet valve, a sampler inlet valve, a sampler, a sampler outlet valve, a sampling device outlet valve, a bypass valve, a pressure instrument and a controller. The sampler is provided with a sampler itself inlet valve and a sampler itself outlet valve. The sampling device inlet valve, the sampler inlet valve, the sampler outlet valve, the sampling device outlet valve, the bypass valve and the pressure instrument are connected with the controller. The sampling device inlet valve, the sampler inlet valve, the sampler itself inlet valve, the sampler itself outlet valve, the sampler outlet valve, the sampling device outlet valve and the bypass valve are electrically controlled valves. The device can accurately control the sampling amount, reduce the labor intensity and realize automatic sampling.

Description

Technical Field

[0001] This invention belongs to the field of uranium enrichment process sampling technology, specifically relating to an automatic sampling device and method. Background Technology

[0002] In a certain special factory, sampling of process loops is carried out by using a sampling platform to manually open and close valves and use a stopwatch to calculate the sampling time.

[0003] The sampling method has the following drawbacks: the manual stopwatch timing method has a large error when the sampling time is very short; the sampling platform inlet is connected to the process loop through a copper pipe, and the ellipticity of the copper pipe directly affects the fluid flow rate, leading to inaccurate empirical formulas; when the sampling pressure is low, the sampling time can be as long as 2 hours or more, which increases the labor intensity of process personnel, may cause personnel fatigue, and increase the risk of human error; when the sampling time is long, the liquid nitrogen freezing of the sampler for a long time may cause blockage of the sampler inlet and stop the sampling. Summary of the Invention

[0004] The purpose of this invention is to provide an automatic sampling device and method, which can accurately control the sampling amount, reduce labor intensity, and realize automatic sampling.

[0005] Technical solution to achieve the purpose of this invention:

[0006] An automatic sampling device includes: a sampling device inlet valve, a sampler inlet valve, a sampler, a sampler outlet valve, a sampling device outlet valve, a bypass valve, a pressure gauge, and a controller. The sampler is equipped with its own inlet valve and its own outlet valve. The sampling device inlet valve, sampler outlet valve, sampler outlet valve, sampler outlet valve, and sampling device outlet valve are connected in series. A bypass valve is connected in parallel between the inlet of the sampler inlet valve and the outlet of the sampler outlet valve. A pressure gauge is installed at the outlet of the sampling device inlet valve. The sampling device inlet valve, sampler outlet valve, sampling device outlet valve, bypass valve, and pressure gauge are all connected to the controller. All the sampling device inlet valve, sampler outlet valve, sampling device outlet valve, and bypass valve are electrically controlled valves.

[0007] The device also includes a temperature sensor, which is connected to the controller.

[0008] The device also includes a gas storage tank valve and a gas storage tank, with the gas storage tank connected between the sampling device inlet valve and the sampler inlet valve via the gas storage tank valve.

[0009] The gas storage tank valve is connected to the controller.

[0010] The device also includes a sampler air-cooling device, which is fitted onto the outside of the sampler.

[0011] The sampler's air-cooled refrigeration unit is connected to the controller.

[0012] An automatic sampling method, the method comprising the following steps:

[0013] Step (1): Calculate the minimum pressure P1, center pressure P2, and maximum pressure P3 required for sampling based on the minimum sampling amount m1, center limit m2, and upper limit m3.

[0014] Step (2): After the vacuum of the sampling device is qualified, the sampler is fully cooled by the sampler air-cooling refrigeration device, and the sampler inlet valve and the sampler outlet valve are opened; the sampler inlet valve, the sampler outlet valve, the sampling device outlet valve, the bypass valve, and the gas storage tank valve are closed, and the sampling device inlet valve is opened.

[0015] Step (3): Open the valve connecting the automatic sampling device provided by this invention to the process circuit;

[0016] Step (4): After the pressure stabilizes, the controller records the process loop pressure P0 and compares the values ​​of P0 with P1 and P3. Based on the comparison results, the sampler performs condensation and material collection under the control of the controller.

[0017] The specific steps (1) are as follows: input the minimum value m1, center limit m2, and upper limit m3 of the sampling quantity m into the controller, and the temperature sensor transmits the temperature to the controller. According to the ideal gas law PV=nRT, the controller calculates the minimum pressure P1, center pressure P2, and maximum pressure P3 required for sampling.

[0018] Step (4) includes:

[0019] Step (4.1): When P0 > P3, the controller opens the gas storage tank valve. When the pressure gauge slowly rises to P2, the sampling device inlet valve is closed. The controller opens the sampler inlet valve, and the sampler performs condensation and material collection. When the pressure gauge no longer drops, the material collection ends, and the sampler is removed and weighed according to regulations.

[0020] Step (4.2): When P1≤P0≤P3, the controller opens the gas storage tank valve. When the pressure gauge is balanced and no longer changes, the sampling device inlet valve is closed. The controller opens the sampler inlet valve, and the sampler performs condensation and material collection. When the pressure gauge pressure no longer drops, the material collection ends, and the sampler removal and weighing operation is carried out as required.

[0021] Step (4.3): When P0 < P1, the controller calculates the number of receiving rounds, including the sampling amount of the complete rounds and the sampling amount of the last round. Under the control of the controller, the samplers of the complete rounds and the last round are condensed and collected.

[0022] Step (4.3) includes:

[0023] Step (4.3.1): The controller calculates the amount of material collected in one round of collection m4 according to the ideal gas law, m4=M*PV / RT, substitutes P=P0 and V=20L, and then calculates the number of collection rounds and the sampling amount m5 of the last round according to the required sampling amount, m5=m2-km4, where m2 is the total sampling amount and k is an integer, that is, the number of complete collection rounds;

[0024] Step (4.3.2), the collection of materials for a complete round, shall be performed as follows:

[0025] The controller opens the gas storage tank valve. When the pressure gauge balances and stops changing, the sampling device inlet valve is closed. The controller opens the sampler inlet valve, and the sampler performs condensation and material collection. When the pressure gauge stops dropping, the sampler outlet valve and the sampling device outlet valve are opened. After the sampling device is evacuated, the sampler outlet valve and the sampling device outlet valve are closed.

[0026] Step (4.3.3), the final round of material collection, shall be performed as follows:

[0027] The final round of material collection is based on the material collection volume m5. The controller calculates the required material collection pressure P4. The controller opens the gas storage tank valve. When the pressure gauge slowly rises to P4, the sampling device inlet valve is closed. The controller opens the sampler inlet valve, and the sampler performs condensation collection. When the gas storage tank pressure no longer drops, the material collection ends, and the sampler is removed and weighed according to regulations.

[0028] The beneficial technical effects of this invention are as follows:

[0029] This invention is applicable to sampling in the process loop of a uranium enrichment plant. By adding a gas storage tank of a certain volume to the existing sampling device, modifying the electrically controlled valves, adding an air-cooling refrigeration device, and adding an automatic control system, the system calculates the sampling pressure, controls the opening and closing of the electrically controlled valves, and condenses the material in the air-cooled sampler. This eliminates the need for manual stopwatch timing and manual addition of liquid nitrogen, achieves precise control of the sampling volume, reduces the labor intensity of process personnel, and improves the safety of process operation. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the sampling stage structure in the prior art;

[0031] Figure 2This is a schematic diagram of an automatic sampling device provided by the present invention.

[0032] In the diagram: 1-Sampling device inlet valve; 2-Sampler inlet valve; 3-Sampler itself inlet valve; 4-Sampler itself outlet valve; 5-Sampler; 6-Sampler outlet valve; 7-Sampling device outlet valve; 8-Bypass valve; 9-Pressure gauge; 10-Gas tank valve; 11-Gas tank; 17-Sampler air-cooled refrigeration unit; 18-Controller; 19-Temperature sensor. Detailed Implementation

[0033] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0034] A schematic diagram of the sampling stage in the prior art is shown below. Figure 1 As shown, 1, 2, 6, 7, and 8 are DN10 manual valves, 3 and 4 are the sampler's own valves, 5 is the sampler, and 9 is a pressure gauge. All valves and gauges are connected by connecting pipes.

[0035] During sampling, valve 1 is connected to the sampling point valve in the process loop via a Φ8 copper pipe, and valve 7 is connected to the process evacuation system via a connecting pipe. The sampler 5 is immersed in a Diva bottle containing liquid nitrogen for cooling. Valves 1, 2, 3, 4, 6, and 7 are opened, and valve 8 is closed. After the sampler 5 is fully cooled, the sampling point valve connected to the process loop is opened, and timing begins. The sampling time is calculated based on the pressure from pressure gauge 9, and the sampling time is determined using empirical formulas.

[0036] t = m / (P × 0.266)

[0037] In the formula:

[0038] t: Sampling time, in seconds;

[0039] m: Specified sampling amount, unit: g;

[0040] P: Pressure of sampling stage c9, unit: Pa;

[0041] Calculate the sampling time; after the sampling time is up, close the valves at the sampling points connected to the process loop.

[0042] This invention adds a gas storage tank, modifies the electronically controlled valve, adds an air-cooled refrigeration device, and adds an automatic control system to the existing sampling station to avoid the shortcomings of the existing sampling station and realize automatic sampling.

[0043] like Figure 2As shown, an automatic sampling device of the present invention includes: a sampling device inlet valve 1, a sampler inlet valve 2, a sampler 5, a sampler outlet valve 6, a sampling device outlet valve 7, a bypass valve 8, a pressure gauge 9, and a controller 18. The sampler 5 is equipped with a sampler inlet valve 3 and a sampler outlet valve 4. The sampling device inlet valve 1, sampler inlet valve 2, sampler inlet valve 3, sampler outlet valve 4, sampler outlet valve 6, and sampling device outlet valve 7 are connected sequentially. The sampler is connected in series, and a bypass valve 8 is connected in parallel between the inlet of the sampler inlet valve 2 and the outlet of the sampler outlet valve 6. A pressure gauge 9 is installed at the outlet of the sampler inlet valve 1. The sampler inlet valve 1, sampler inlet valve 2, sampler outlet valve 6, sampler outlet valve 7, bypass valve 8, and pressure gauge 9 are all connected to the controller 18. The sampler inlet valve 1, sampler inlet valve 2, sampler outlet valve 6, sampler outlet valve 7, and bypass valve 8 are all electrically controlled valves.

[0044] The device also includes a temperature sensor 19, which is connected to the controller 18.

[0045] The device also includes a gas storage tank valve 10 and a gas storage tank 11. The gas storage tank 11 is connected between the sampling device inlet valve 1 and the sampler inlet valve 2 via the gas storage tank valve 10. The gas storage tank valve 10 is connected to the controller 18.

[0046] The device also includes a sampler air-cooling device 17, which is fitted outside the sampler 5 and is connected to the controller 18.

[0047] This invention employs an automatic sampling method provided by the above-mentioned device, specifically including the following steps:

[0048] Step (1): Based on the minimum sampling amount m1, the center limit m2, and the upper limit m3, calculate the minimum pressure P1, the center pressure P2, and the maximum pressure P3 required for sampling.

[0049] The minimum value m1, center limit m2, and upper limit m3 of the sampling quantity m are input into the controller 18. The temperature sensor transmits the temperature to the controller 18. According to the ideal gas law PV=nRT, where n is the amount of substance of the working substance, n=m / M; M is the molar mass of the substance; R is the universal gas constant; and T is the absolute temperature, the temperature sensor transmits the temperature to the controller 18. The controller 18 calculates the minimum pressure P1, center pressure P2, and maximum pressure P3 required for sampling.

[0050] Step (2): After the sampling device passes the vacuum test, the sampler 5 is fully cooled by the sampler air-cooling device 17. Valves 3 and 4 of the sampler itself are opened; electrically controlled valves 2, 6, 7, 8, and 10 are closed; and electrically controlled valve 1 is opened.

[0051] Sampler 5 has been installed and the sampling device has passed vacuum testing. Start the sampler air-cooling refrigeration unit 17 in advance to fully freeze sampler 5, open valves 3 and 4 of the sampler itself; close the electrically controlled valves 2, 6, 7, 8, and 10; open the electrically controlled valve 1.

[0052] Step (3): Open the valve connecting the automatic sampling device provided by the present invention to the process circuit.

[0053] Step (4): After the pressure stabilizes, the controller 18 records the process loop pressure P0 and compares the values ​​of P0 with those of P1 and P3. Based on the comparison results, the sampler 5 performs condensation and material collection under the control of the controller 18.

[0054] Step (4.1): When P0 > P3, the controller 18 opens valve 10. When the pressure on the pressure gauge 9 slowly rises to P2, valve 1 closes. The controller 18 opens the sampler inlet valve 2, and the sampler 5 performs condensation and material collection. When the pressure on the pressure gauge 9 no longer decreases, the material collection ends, and the sampler 5 is disassembled and weighed according to regulations.

[0055] Step (4.2): When P1≤P0≤P3, the controller 18 opens valve 10. When the pressure gauge 9 is balanced and no longer changes, the sampling device inlet valve 1 is closed. The controller 18 opens the sampler inlet valve 2, and the sampler 5 performs condensation and material collection. When the pressure gauge 9 no longer drops, the material collection ends, and the sampler 5 is disassembled and weighed according to regulations.

[0056] Step (4.3): When P0 < P1, the controller 18 calculates the number of receiving rounds, including the sampling amount of the complete rounds and the sampling amount of the last round. Under the control of the controller 18, the sampler 5 of the complete rounds and the last round are condensed and collected respectively.

[0057] Step (4.3.1): The controller 18 calculates the amount of material collected in one round of collection m4 according to the ideal gas law, m4 = M*PV / RT (substitute P = P0, V = 20L), and then calculates the number of collection rounds and the sampling amount m5 of the last round according to the required sampling amount, m5 = m2 - km4 (m2 is the total sampling amount, k is an integer, i.e. the number of complete collection rounds).

[0058] Step (4.3.2), the collection of materials for a complete round, shall be performed as follows:

[0059] The controller 18 opens valve 10. When the pressure on the pressure gauge 9 reaches equilibrium and stops changing, the sampling device inlet valve 1 is closed. The controller 18 then opens the sampler inlet valve 2, and the sampler 5 performs condensation and material collection. When the pressure on the pressure gauge 9 stops decreasing, the sampler outlet valve 6 and the sampling device outlet valve 7 are opened. After evacuating the sampling device, the sampler outlet valve 6 and the sampling device outlet valve 7 are closed.

[0060] Step (4.3.3), the final round of material collection, shall be performed as follows:

[0061] The final round of material collection is based on the collected material quantity m5, and the controller 18 calculates the required collection pressure P4. The controller 18 opens valve 10, and when the pressure gauge 9 slowly rises to P4, valve 1 closes. The controller 18 then opens the sampler inlet valve 2, and the sampler 5 performs condensation collection. Once the pressure in the gas storage tank 11 stops decreasing, the collection process ends, and the sampler 5 is removed and weighed according to regulations.

[0062] Example 1

[0063] In a certain factory, the operating environment is as follows: process loop pressure is 250 Pa to 5.5 kPa, and the operating temperature is 16 °C. During a sampling operation, 4 g ± 1 g of sample was taken from the process loop at a pressure of 5.4 kPa as required. The sampled substance was UF6, and its molar mass is 352.

[0064] The sampling steps are as follows:

[0065] The sampling device has passed the vacuum test. Start the sampler cooling device 17 in advance to fully freeze the sampler 5, open valves 3 and 4 of the sampler itself; close valves 2, 6, 7, 8 and 10; open valve 1.

[0066] Input the parameters of the required sampling amount (lower limit m1 = 3g, middle limit m2 = 4g, upper limit m3 = 5g) into the controller 18. The controller 18 will calculate the minimum pressure required for sampling (P1 = 1024Pa, middle pressure P2 = 1365Pa, and maximum pressure P3 = 1707Pa).

[0067] Open the valve connecting the sampling device to the process loop. After the pressure stabilizes, the controller 18 records the process loop pressure P0 = 5.4 kPa.

[0068] Controller 18 determines that P0 > P3. Controller 18 then opens valve 10. When the pressure in the gas storage tank slowly rises to 1365 Pa, valve 1 closes. Controller 18 then opens sampler inlet valve 2, and sampler 5 begins condensation and material collection. Once the pressure gauge 9 stops dropping, material collection is complete, and sampler 5 is removed and weighed according to regulations.

[0069] The automatic sampling device shall be dismantled in accordance with regulations.

[0070] Example 2

[0071] In a certain factory, the operating environment is as follows: process loop pressure is 250 Pa to 5.5 kPa, and the operating temperature is 16 °C. During a sampling operation, 1.75 g ± 0.25 g was taken from the process loop at a pressure of 625 Pa as required. The sampled substance was UF6, with a molar mass of 352.

[0072] The sampling steps are as follows:

[0073] The sampling device has passed the vacuum test. Start the sampler cooling device 17 in advance to fully freeze the sampler 5, open valves 3 and 4 of the sampler itself; close valves 2, 6, 7, 8 and 10; open valve 1.

[0074] Input the parameters of the required sampling amount (lower limit m1 = 1.5g, middle limit m2 = 1.75g, upper limit m3 = 2g) into the controller 18. The controller 18 will calculate the minimum pressure required for sampling (P1 = 512Pa, middle pressure P2 = 597Pa, and maximum pressure P3 = 683Pa).

[0075] Open the valve connecting the sampling device to the process loop. After the pressure stabilizes, the controller 18 records the process loop pressure P0 = 625 Pa.

[0076] Controller 18 determines that P1≤P0≤P3. Controller 18 then opens valve 10. When pressure gauge 9 reaches equilibrium and stops changing, the sampling device inlet valve 1 is closed. Controller 18 then opens sampler inlet valve 2, and sampler 5 performs condensation and material collection. Once pressure gauge 9 stops decreasing, material collection is complete, and sampler 5 is disassembled and weighed according to regulations.

[0077] The automatic sampling device shall be dismantled in accordance with regulations.

[0078] Example 3

[0079] In a certain factory, the operating environment is as follows: process loop pressure is 250 Pa to 5.5 kPa, and the operating temperature is 16 °C. During a sampling operation, 4 g ± 1 g of sample was taken from a process loop with a pressure of 300 Pa as required. The sampled substance was UF6, and its molar mass is 352.

[0080] The sampling steps are as follows:

[0081] The sampling device has passed the vacuum test. Start the sampler cooling device 17 in advance to fully freeze the sampler 5, open valves 3 and 4 of the sampler itself; close valves 2, 6, 7, 8 and 10; open valve 1.

[0082] Input the parameters of the required sampling amount (lower limit m1 = 3g, middle limit m2 = 4g, upper limit m3 = 5g) into the controller 18. The controller 18 will calculate the minimum pressure required for sampling (P1 = 1024Pa, middle pressure P2 = 1365Pa, and maximum pressure P3 = 1707Pa).

[0083] Open the valve connecting the sampling device to the process loop. After the pressure stabilizes, the controller 18 records the process loop pressure P0 = 300 Pa.

[0084] The controller 18 determines that P0 < P1 and calculates the amount of material collected in one round, m4 = 0.879g, and the amount of material collected in the last round, m5 = m2 - km4 = 0.48g, k = 4.

[0085] The first four rounds of material collection shall be carried out as follows:

[0086] The controller 18 controls the valve 10 to open. When the pressure in the gas storage tank 11 reaches equilibrium and stops changing, the sampling device inlet valve 1 is closed. The controller 18 then opens the sampler inlet valve 2, and the sampler 5 performs condensation and material collection. When the pressure gauge 9 stops dropping, the sampler outlet valve 6 and the sampling device outlet valve 7 are opened. After evacuating the sampling device, the sampler outlet valve 6 and the sampling device outlet valve 7 are closed.

[0087] For the final round of material collection, based on the collection quantity m5, the controller 18 calculates the required collection pressure P4 = 164 Pa. The controller 18 opens valve 10, and when the pressure gauge 9 slowly rises to 164 Pa, valve 1 closes. The controller 18 then opens the sampler inlet valve 2, and the sampler 5 performs condensation collection. Once the pressure gauge 9 no longer drops, the collection is complete, and the sampler 5 is removed and weighed according to regulations.

[0088] The automatic sampling device shall be dismantled in accordance with regulations.

[0089] The present invention has been described in detail above with reference to the accompanying drawings and embodiments. However, the present invention is not limited to the above embodiments, and various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention. All contents not described in detail in the present invention can be derived from existing technologies.

Claims

1. An automatic sampling method, characterized in that, The automatic sampling device used in the method includes: a sampling device inlet valve (1), a sampler inlet valve (2), a sampler (5), a sampler outlet valve (6), a sampling device outlet valve (7), a bypass valve (8), a pressure gauge (9), a gas storage tank (11), a sampler air-cooled refrigeration device (17), and a controller (18). The sampler (5) is equipped with a sampler inlet valve (3) and a sampler outlet valve (4). The sampling device inlet valve (1), sampler inlet valve (2), sampler inlet valve (3), sampler outlet valve (4), sampler outlet valve (6), and sampling device outlet valve (7) are connected in series. A bypass valve (8) is connected in parallel between the inlet of the sampler inlet valve (2) and the outlet of the sampler outlet valve (6). A pressure gauge (9) is installed at the outlet of the device inlet valve (1); the gas storage tank (11) is connected between the sampling device inlet valve (1) and the sampler inlet valve (2) via the gas storage tank valve (10); the sampler air-cooled refrigeration device (17) is fitted outside the sampler (5); the sampling device inlet valve (1), the sampler inlet valve (2), the sampler outlet valve (6), the sampling device outlet valve (7), the bypass valve (8), the pressure gauge (9), the gas storage tank valve (10), and the sampler air-cooled refrigeration device (17) are respectively connected to the controller (18); the sampling device inlet valve (1), the sampler inlet valve (2), the sampler inlet valve (3), the sampler outlet valve (4), the sampler outlet valve (6), the sampling device outlet valve (7), and the bypass valve (8) are all electrically controlled valves; The method includes the following steps: Step (1): Calculate the minimum pressure P1, center pressure P2, and maximum pressure P3 required for sampling based on the minimum sampling amount m1, center limit m2, and upper limit m3. Step (2): After the vacuum of the sampling device is qualified, the sampler (5) is fully cooled by the sampler air-cooling refrigeration device (17), and the sampler inlet valve (3) and the sampler outlet valve (4) are opened; the sampler inlet valve (2), the sampler outlet valve (6), the sampling device outlet valve (7), the bypass valve (8), the gas storage tank valve (10) are closed, and the sampling device inlet valve (1) is opened. Step (3): Open the valve connecting the automatic sampling device to the process loop; Step (4): After the pressure stabilizes, the controller (18) records the process loop pressure P0 and compares the values ​​of P0 with P1 and P3. Based on the comparison results, the sampler (5) performs condensation and material collection under the control of the controller (18).

2. The automatic sampling method according to claim 1, characterized in that, The device also includes a temperature sensor (19), which is connected to the controller (18).

3. The automatic sampling method according to claim 2, characterized in that, The specific steps (1) are as follows: input the minimum value m1, center limit m2, and upper limit m3 of the sampling quantity m into the controller (18), and the temperature is transmitted to the controller (18) by the temperature sensor. According to the ideal gas state equation PV=nRT, the controller (18) calculates the minimum pressure P1, center pressure P2, and maximum pressure P3 required for sampling.

4. The automatic sampling method according to claim 3, characterized in that, Step (4) includes: Step (4.1): When P0 > P3, the controller (18) controls the opening of the gas storage tank valve (10). When the pressure of the pressure gauge (9) slowly rises to P2, the sampling device inlet valve (1) is closed. The controller (18) opens the sampler inlet valve (2), and the sampler (5) performs condensation and material collection. When the pressure of the pressure gauge (9) no longer drops, the material collection ends, and the sampler (5) is dismantled and weighed according to regulations. Step (4.2): When P1≤P0≤P3, the controller (18) controls the opening of the gas storage tank valve (10). When the pressure gauge (9) is balanced and no longer changes, the sampling device inlet valve (1) is closed. The controller (18) opens the sampler inlet valve (2), and the sampler (5) performs condensation and material collection. When the pressure gauge (9) no longer drops, the material collection ends, and the sampler (5) is dismantled and weighed according to regulations. Step (4.3): When P0 < P1, the controller (18) calculates the number of receiving rounds, including the sampling amount of the complete rounds and the sampling amount of the last round. Through the control of the controller (18), the samplers (5) of the complete rounds and the last round are condensed and collected.

5. The automatic sampling method according to claim 4, characterized in that, Step (4.3) includes: Step (4.3.1): The controller (18) calculates the amount of material collected in one round of material collection m4 according to the ideal gas law, m4=M*PV / RT, substitutes P= P0, V=20L, and then calculates the number of material collection rounds and the sampling amount m5 of the last round according to the required sampling amount, m5=m2-km4, m2 is the total sampling amount, k is an integer, that is, the number of complete material collection rounds; Step (4.3.2), the collection of materials for a complete round, shall be performed as follows: The controller (18) controls the opening of the gas storage tank valve (10). When the pressure gauge (9) is balanced and no longer changes, the sampling device inlet valve (1) is closed. The controller (18) opens the sampler inlet valve (2), and the sampler (5) performs condensation and material collection. When the pressure gauge (9) no longer drops, the sampler outlet valve (6) and the sampling device outlet valve (7) are opened. After the sampling device is evacuated, the sampler outlet valve (6) and the sampling device outlet valve (7) are closed. Step (4.3.3), the final round of material collection shall be performed as follows: The last round of material collection is based on the material collection amount m5. The controller (18) calculates the required material collection pressure P4. The controller (18) controls the opening of the gas storage tank valve (10). When the pressure gauge (9) slowly rises to P4, the sampling device inlet valve (1) is closed. The controller (18) opens the sampler inlet valve (2), and the sampler (5) performs condensation material collection. When the pressure of the gas storage tank (11) no longer drops, the material collection ends, and the sampler (5) is removed and weighed according to regulations.

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