SF6 gas recovery accounting method

Abstract

A kind of SF6 gas recovery accounting method, the method is realized by SF6 gas recovery accounting device, gas density numerical value in equipment is calculated using temperature sensor, pressure sensor, combined with the quantitative volume bottle built-in in device, the volume of recovery gas chamber is quickly quantitatively obtained, and the gas recovery rate is calculated by the reduction rate of gas in quantitative volume bottle, and the total amount of gas, recovery rate is obtained by equipment volume and gas density, the amount of gas that has been recovered.Citing dynamic pressure compensation technology is changed from dynamic to static for the measurement of gas in gas chamber, and the real-time recovery rate and display pressure are corrected.

Description

Technical fields:

[0001] This invention relates to the field of SF6 gas recovery technology, and in particular to an SF6 gas recovery accounting method. Background technology:

[0002] SF6 gas is widely used in various SF6 electrical equipment due to its superior insulating properties and arc-extinguishing capabilities compared to ordinary electrolytes. However, SF6 gas is expensive and decomposes into toxic components under the influence of electric arcs, sparks, and corona discharges. Therefore, when filling equipment is decommissioned, it is generally recovered using specialized recovery equipment. However, recovery equipment cannot recover all the gas, and some loss is inevitable during the process. Therefore, the amount of gas remaining in the filling equipment before recovery cannot be directly used as the amount to be recovered. Summary of the Invention:

[0003] In view of this, it is necessary to provide an accounting method for SF6 gas recovery.

[0004] An SF6 gas recovery accounting method is provided, which is implemented by an SF6 gas recovery accounting device. The SF6 gas recovery accounting device includes a recovery pipeline, a quantitative volume bottle, an SF6 pure gas bottle, an internal temperature sensor, an internal pressure sensor, a gas chamber temperature sensor, and a gas chamber pressure sensor.

[0005] The method includes the following steps:

[0006] S0. Connect the SF6 pure gas cylinder to the inlet of the recovery pipeline, and calculate the volume V of the quantitative volumetric cylinder using the density formula. 瓶 ;

[0007] S1. Remove the SF6 pure gas cylinder and connect the gas inlet of the recovery pipeline to the gas filling equipment. Measure the temperature T of the gas chamber before recovery using the gas chamber temperature sensor and gas chamber pressure sensor. G0 and initial pressure P G0 The density ρ of SF6 gas in the gas chamber before recovery was calculated using the Beattie-Bridgman gas law. G0 ;

[0008] S2. During the recycling process, the bottle temperature sensor and bottle pressure sensor monitor the temperature T of the quantitative volumetric bottle at the time of quantitative measurement. p and pressure P p Measurements were performed, and the quantitative density ρ of SF6 gas in the quantitative volumetric bottle was calculated using the Beattie-Bridgman gas law. p ;

[0009] S3. Calculate the quantitative density ρ of SF6 gas for each step. pThe gas volume ρ is obtained by summing the measurements, and the gas volume measured by the quantitative volume bottle is calculated using the density formula. This gas volume is equal to the gas volume Δm that is reduced in the gas chamber.

[0010] S4. During the recycling process, the temperature T of the gas chamber before and after quantitative measurement in the quantitative volumetric bottle is measured using the gas chamber temperature sensor and the gas chamber pressure sensor, respectively. G1 T G2 and pressure P G1 P G2 For pressure P G1 P G2 After dynamic pressure compensation, the SF6 gas density ρ in the gas chamber before and after quantitative measurement was calculated using the Beattie-Bridgman gas state equation. G1 ρ G2 The volume V of the air chamber was calculated using the density formula. 室 The total amount of gas in the gas chamber before recovery (m) 室 ;

[0011] S5. During the recovery process, the gas chamber temperature sensor and gas chamber pressure sensor monitor the real-time temperature T of the gas chamber. Gi and real-time pressure P Gi The real-time SF6 gas density ρ in the gas chamber was calculated using the Beattie-Bridgman gas state equation. Gi The real-time density ρ of SF6 in the gas chamber Gi And the density ρ of SF6 gas before recycling G0 Calculate the real-time gas recovery rate during the recovery process;

[0012] S6. After recovery, the temperature T of the gas chamber after recovery is measured by the gas chamber temperature sensor and the gas chamber pressure sensor, respectively. G3 and initial pressure P G3 The density ρ of SF6 gas in the gas chamber after recovery was calculated using the Beattie-Bridgman gas law. G3 This allows for the calculation of the actual gas volume in the current gas chamber, the amount of gas recovered, and the final gas recovery rate.

[0013] Preferably, in step S0, the method for calculating the volume of the quantitative volumetric bottle is as follows:

[0014] S01. Before the measurement begins, use a precision electronic scale to measure the weight m0 of the SF6 pure gas cylinder and connect the SF6 pure gas cylinder to the inlet of the recovery pipeline.

[0015] S02. Open the first electric regulating valve and the solenoid valve. Measure the initial temperature T0 and initial pressure P0 of the quantitative volumetric bottle using the internal temperature sensor and pressure sensor, respectively. Calculate the pressure S before filling the quantitative volumetric bottle using the Beattie-Bridgman gas state equation. F6 Gas density ρ0;

[0016] S03. Open the valve of the SF6 pure gas cylinder, fill the metered volumetric gas bottle to a certain pressure, and then close the valve. Measure the final temperature T1 and final pressure P1 of the metered volumetric gas bottle using the internal temperature sensor and pressure sensor, respectively. Calculate the pressure S after filling the metered volumetric gas bottle using the Beattie-Bridgman gas state equation. F6 Gas density ρ1;

[0017] S04. Remove the SF6 pure gas cylinder and measure the weight m1 of the SF6 pure gas cylinder after it is fully filled with gas.

[0018] S05. Substitute the weights m0 and m1 of the SF6 pure gas cylinder before and after filling, and the densities ρ0 and ρ1 of the quantitative volumetric bottle before and after filling, into the formula m0-m1=(ρ1-ρ0)×V to obtain the volume value V of the quantitative volumetric bottle.

[0019] Preferably, steps S01 to S05 are repeated multiple times, and the volume values ​​V of the quantitative volumetric bottles obtained each time are added together and averaged to obtain the final volume V of the quantitative volumetric bottle. 瓶 .

[0020] The preferred formula for the Beattie-Bridgman gas law is as follows:

[0021] P=(RTB-A)ρ2+RTρ

[0022] A=73.882×10-5-5.132105×10-7ρ

[0023] B=2.50695×10-3-2.12283×10-6ρ

[0024] R = 56.9502 × 10⁻⁵

[0025] Where T is the gas temperature measured by the temperature sensor, P is the pressure measured by the pressure sensor, and ρ is the SF6 gas density.

[0026] Preferably, the recovery pipeline includes a gas pipe and a first electric regulating valve, a solenoid valve, and a second electric regulating valve installed sequentially on the gas pipe. A metering volume bottle is disposed between the solenoid valve and the second electric regulating valve. The first electric regulating valve is used to regulate the gas flow rate of the recovery pipeline between the metering volume bottle and the gas pipe inlet, and the second electric regulating valve is used to regulate the gas flow rate of the recovery pipeline between the metering volume bottle and the gas pipe outlet.

[0027] Preferably, it also includes a control device, wherein the first electric regulating valve, the solenoid valve, the second electric regulating valve, the bottle internal temperature sensor, the bottle internal pressure sensor, the gas chamber temperature sensor, and the gas chamber pressure sensor are all electrically connected to the control device.

[0028] Preferably, in step S4, the dynamic pressure compensation method is as follows:

[0029] S41. The control device controls the opening degree of the first electric regulating valve and measures the dynamic pressure value in the open state and the static pressure value in the closed state through the air chamber pressure sensor.

[0030] S42. Repeat step S41 multiple times to obtain multiple sets of dynamic and static pressure data, fit the data into a dynamic pressure curve, and deduce the pressure change pattern.

[0031] S43. The air chamber pressure sensor measures the pressure P in the air chamber before and after quantitative measurement using the quantitative volumetric flask. G1 P G2 Pressure P G1 P G2 The pressure is corrected according to the pressure change pattern to obtain the corrected pressure P. G11 P G21 ;

[0032] S44, Corrected pressure P G11 P G21 The SF6 gas density ρ in the gas chamber before and after quantitative determination was calculated using the Beattie-Bridgman gas law. G1 ρ G2 .

[0033] Preferably, in step S4, the SF6 gas density ρ in the gas chamber before and after quantitative measurement is... G1 ρ G2 Substituting the amount of gas reduced in the chamber during the recovery process, Δm, into the following formula, we can obtain the volume V of the chamber. 室 :

[0034]

[0035] The SF6 gas density ρ in the gas chamber before recovery G0 and the volume V of the air chamber 室 Substitute into the following formula to obtain the total amount of gas m in the gas chamber before recovery. 室 :

[0036] m 室 =ρ G0 ×V 室 .

[0037] Preferably, in step S5, the real-time density ρ of the gas chamber during the recovery process is... Gi and the SF6 gas density ρ in the gas chamber before recovery G0 Substitute into the following formula to obtain the real-time gas recovery rate during the recovery process:

[0038]

[0039] Preferably, in step S6, the gas chamber is filled with SF6 gas after recovery, and the gas density ρ is... G3 and the volume V of the air chamber 室 Substitute into the following formula to obtain the actual gas quantity m in the current gas chamber. 实际 :

[0040] m 实际 =ρ G3 ×V 室 ;

[0041] The total amount of gas in the gas chamber before recovery is m 室 And the actual gas volume m in the current gas chamber 实际 Substitute into the following formula to obtain the amount of gas recovered in the gas chamber, m. 回收 :

[0042] m_recovery = total gas volume m 室 - Actual gas quantity m 实际 ;

[0043] The density ρ of the recovered SF6 gas in the gas chamber G3 And the SF6 gas density ρ in the gas chamber before recovery G0 Substitute into the following formula to obtain the gas recovery rate:

[0044]

[0045] In the above-mentioned SF6 gas recovery calculation method, the Beattie-Bridgman gas state equation is used to calculate the gas density in the gas chamber before and after recovery. The gas chamber volume is quickly and quantitatively estimated by the ratio of the quantitative volumetric bottle to the gas chamber volume. The gas recovery rate is calculated by the rate of gas reduction in the quantitative volumetric bottle. Finally, the total gas volume and recovery rate are calculated using the equipment volume, gas density, and the amount of gas recovered. During the calculation process, due to pressure loss from dynamic fluids, the pressure value measured by the pressure sensor will be lower than the actual pressure value of the container in a steady state. Dynamic pressure compensation technology is used to change the measurement of the gas in the gas chamber from dynamic to static, correcting the recovery rate and displayed pressure. Attached image description:

[0046] Appendix Figure 1 This is a schematic diagram of the dynamic pressure compensation fitting curve.

[0047] Appendix Figure 2This is a schematic diagram of the SF6 gas recovery accounting device.

[0048] In the diagram: 1. Quantitative volumetric bottle; 2. SF6 pure gas cylinder; 3. In-cylinder temperature sensor; 4. In-cylinder pressure sensor; 5. Gas chamber temperature sensor; 6. Gas chamber pressure sensor; 7. First electric regulating valve; 8. Solenoid valve; 9. Second electric regulating valve. Detailed implementation method:

[0049] An SF6 gas recovery accounting method includes the following steps:

[0050] S0. Connect the SF6 pure gas cylinder to the inlet of the recovery pipeline, and calculate the volume V of the quantitative volumetric cylinder using the density formula. 瓶 ;

[0051] S1. Remove the SF6 pure gas cylinder and connect the gas inlet of the recovery pipeline to the gas filling equipment. Measure the temperature T of the gas chamber before recovery using the gas chamber temperature sensor and gas chamber pressure sensor. G0 and initial pressure P G0 The density ρ of SF6 gas in the gas chamber before recovery was calculated using the Beattie-Bridgman gas law. G0 ;

[0052] S2. During the recycling process, the bottle temperature sensor and bottle pressure sensor monitor the temperature T of the quantitative volumetric bottle at the time of quantitative measurement. p and pressure P p Measurements were performed, and the quantitative density ρ of SF6 gas in the quantitative volumetric bottle was calculated using the Beattie-Bridgman gas law. p ;

[0053] S3. Calculate the quantitative density ρ of SF6 gas for each step. p The gas volume ρ is obtained by summing the measurements, and the gas volume measured by the quantitative volume bottle is calculated using the density formula. This gas volume is equal to the gas volume Δm that is reduced in the gas chamber.

[0054] S4. During the recycling process, the temperature T of the gas chamber before and after quantitative measurement in the quantitative volumetric bottle is measured using the gas chamber temperature sensor and the gas chamber pressure sensor, respectively. G1 T G2 and pressure P G1 P G2 For pressure P G1 P G2 After dynamic pressure compensation, the SF6 gas density ρ in the gas chamber before and after quantitative measurement was calculated using the Beattie-Bridgman gas state equation. G1 ρ G2 ;

[0055] The SF6 gas density ρ in the gas chamber before and after quantitative measurement G1 ρ G2 Substituting the amount of gas reduced in the chamber during the recovery process, Δm, into the following formula, we can obtain the volume V of the chamber. 室 :

[0056]

[0057] The SF6 gas density ρ in the gas chamber before recovery G0 and the volume V of the air chamber 室 Substitute into the following formula to obtain the total amount of gas m in the gas chamber before recovery. 室 :

[0058] m 室 =ρ G0 ×V 室 .

[0059] In step S5, the real-time density ρ of the gas chamber during the recovery process is recorded. Gi and the SF6 gas density ρ in the gas chamber before recovery G0 Substitute into the following formula to obtain the real-time gas recovery rate during the recovery process;

[0060] S5. During the recovery process, the gas chamber temperature sensor and gas chamber pressure sensor monitor the real-time temperature T of the gas chamber. Gi and real-time pressure P Gi The real-time SF6 gas density ρ in the gas chamber was calculated using the Beattie-Bridgman gas state equation. Gi The real-time density ρ of SF6 in the gas chamber Gi And the density ρ of SF6 gas before recycling G0 Substitute the values ​​into the following formula to obtain the real-time gas recovery rate during the recovery process:

[0061]

[0062] S6. After recovery, the temperature T of the gas chamber after recovery is measured by the gas chamber temperature sensor and the gas chamber pressure sensor, respectively. G3 and initial pressure P G3 The density ρ of SF6 gas in the gas chamber after recovery was calculated using the Beattie-Bridgman gas law. G3 ;

[0063] The density ρ of the recovered SF6 gas in the gas chamber G3 and the volume V of the air chamber 室 Substitute into the following formula to obtain the actual gas quantity m in the current gas chamber. 实际 :

[0064] m 实际 =ρG3 ×V 室 ;

[0065] The total amount of gas in the gas chamber before recovery is m 室 And the actual gas volume m in the current gas chamber 实际 Substitute into the following formula to obtain the amount of gas recovered in the gas chamber, m. 回收 :

[0066] m_recovery = total gas volume m 室 - Actual gas quantity m 实际 ;

[0067] The density ρ of the recovered SF6 gas in the gas chamber G3 And the SF6 gas density ρ in the gas chamber before recovery G0 Substitute into the following formula to obtain the gas recovery rate:

[0068]

[0069] In the SF6 gas recovery accounting method, the Beattie-Bridgman gas state equation is as follows:

[0070] P=(RTB-A)ρ2+RTρ

[0071] A=73.882×10-5-5.132105×10-7ρ

[0072] B=2.50695×10-3-2.12283×10-6ρ

[0073] R = 56.9502 × 10⁻⁵

[0074] Where T is the gas temperature measured by the gas chamber temperature sensor or the bottle internal temperature sensor, P is the pressure measured by the gas chamber pressure sensor or the bottle internal pressure sensor, and ρ is the SF6 gas density.

[0075] The density formula is ρ = m / V, where ρ is the density of SF6 gas, m is the volume of SF6 gas, and V is generally the volume of the gas chamber or the volume of the quantitative volumetric bottle in this method.

[0076] The two formulas mentioned above are frequently used in this method. Since they are based on the same principle, the meaning of their numerical values ​​will be explained in more detail based on the actual situation, and will not be repeated here.

[0077] Since the quantitative volumetric bottle is a quantitative measuring device, the accuracy of its volume determines the accuracy of the entire device's calculation of the recovered gas chamber volume. The accurate measurement of the recovered gas chamber volume is achieved based on the accurate quantification of the volumetric bottle.

[0078] In step S0, the method for calculating the volume of the quantitative volumetric bottle is as follows:

[0079] S01. Before the measurement begins, use a precision electronic scale to measure the weight m0 of the SF6 pure gas cylinder and connect the SF6 pure gas cylinder to the inlet of the recovery pipeline.

[0080] S02. Open the first electric regulating valve and the solenoid valve. Measure the initial temperature T0 and initial pressure P0 of the quantitative volumetric bottle using the internal temperature sensor and pressure sensor, respectively. Calculate the pressure S before filling the quantitative volumetric bottle using the Beattie-Bridgman gas state equation. F6 Gas density ρ0;

[0081] S03. Open the valve of the SF6 pure gas cylinder, fill the metered volumetric gas bottle to a certain pressure, and then close the valve. Measure the final temperature T1 and final pressure P1 of the metered volumetric gas bottle using the internal temperature sensor and pressure sensor, respectively. Calculate the pressure S after filling the metered volumetric gas bottle using the Beattie-Bridgman gas state equation. F6 Gas density ρ1;

[0082] S04. Remove the SF6 pure gas cylinder and measure the weight m1 of the SF6 pure gas cylinder after it is fully filled with gas.

[0083] S05. Substitute the weights m0 and m1 of the SF6 pure gas cylinder before and after filling, and the densities ρ0 and ρ1 of the quantitative volumetric bottle before and after filling, into the formula m0-m1=(ρ1-ρ0)×V to obtain the volume value V of the quantitative volumetric bottle.

[0084] S06. Repeat steps S01 to S05 six times to obtain six sets of data as shown in Table 1. Add the volume values ​​V of the six sets of quantitative volumetric bottles and take the average value to obtain the final volume V of the quantitative volumetric bottle. 瓶 V 瓶 It is 2.11L.

[0085] Table 1: Experimental Data Table for Quantitative Volumetric Measurement Technology

[0086]

[0087]

[0088] When SF6 gas flows in real time in the recovery pipeline, the pressure value measured by the gas chamber pressure sensor will be lower than the actual pressure value in the steady state due to the pressure loss of the dynamic fluid. Therefore, the real-time recovery rate data will fluctuate greatly with the change of flow rate before and after the valve is closed.

[0089] Therefore, by measuring the change from dynamic to static gas in the gas chamber using a pressure sensor, a dynamic pressure curve is fitted, and the real-time recovery rate and displayed pressure are corrected.

[0090] In step S4, the dynamic pressure compensation method is as follows:

[0091] S41. The control device controls the opening degree of the first electric regulating valve and measures the dynamic pressure value in the open state and the static pressure value in the closed state through the air chamber pressure sensor.

[0092] S42. Repeat step S41 five times to obtain five sets of dynamic pressure values ​​and static pressure values. Fit the data into a dynamic pressure curve and deduce the pressure change pattern.

[0093] S43. The air chamber pressure sensor measures the pressure P in the air chamber before and after quantitative measurement using the quantitative volumetric flask. G1 P G2 Pressure P G1 P G2 The pressure is corrected according to the pressure change pattern to obtain the corrected pressure P. G11 P G21 ;

[0094] S44, Corrected pressure P G11 P G21 The SF6 gas density ρ in the gas chamber before and after quantitative determination was calculated using the Beattie-Bridgman gas law. G1 ρ G2 .

[0095] In step S42, the test data for dynamic pressure compensation are shown in Table 2 below.

[0096]

[0097] The experimental data shows that the pressure changes after valve closure exhibit a certain relationship; therefore, the pressure change pattern can be deduced from the static pressure relationship before and after valve closure. Based on the data in Table 3-2, a polynomial fitting was performed, and the fitted curve is shown below. Figure 1 As shown.

[0098] The fitted curve is as follows:

[0099] y = 0.23998x 2 +0.9797x+0.003

[0100] Where y is the static pressure in MPa; and x is the dynamic pressure when the valve is closed in MPa.

[0101] The static pressure after compensation is calculated based on the collected dynamic pressure.

[0102] The SF6 gas recovery accounting method is implemented through an SF6 gas recovery accounting device, such as... Figure 2As shown, the SF6 gas recovery and accounting device includes a recovery pipeline, a quantitative volumetric bottle 1, an SF6 pure gas cylinder 2, an internal temperature sensor 3, an internal pressure sensor 4, a gas chamber temperature sensor 5, a gas chamber pressure sensor 6, and a control device (not shown). The recovery pipeline includes a gas pipe (not labeled) and a first electric regulating valve 7, a solenoid valve 8, and a second electric regulating valve 9 sequentially installed on the gas pipe. The quantitative volumetric bottle 1 is located between the solenoid valve 8 and the second electric regulating valve 9. The gas inlet of the recovery pipeline is replaced by connecting the SF6 pure gas cylinder 2 and the filling equipment. Alternatively, the recovery pipeline can be branched. When it is necessary to measure the volume of the quantitative volumetric bottle 1, the filling equipment cuts off the passage through its built-in valve. Similarly, when recovery and accounting are required, the valve of the SF6 pure gas cylinder 2 is closed to cut off the passage.

[0103] The first electric regulating valve 7, the solenoid valve 8, the second electric regulating valve 9, the bottle internal temperature sensor 3, the bottle internal pressure sensor 4, the gas chamber temperature sensor 5, and the gas chamber pressure sensor 6 are all electrically connected to the control device; the first electric regulating valve 7 is used to regulate the gas flow rate of the recovery pipeline between the quantitative volume bottle 1 and the gas inlet port of the gas pipe, and the second electric regulating valve 9 is used to regulate the gas flow rate of the recovery pipeline between the quantitative volume bottle 1 and the gas outlet port of the gas pipe.

Claims

1. An SF6 gas recovery accounting method, wherein the method is implemented by an SF6 gas recovery accounting device, characterized in that: The SF6 gas recovery and accounting device includes a recovery pipeline, a quantitative volumetric bottle, an SF6 pure gas cylinder, an internal temperature sensor, an internal pressure sensor, a gas chamber temperature sensor, and a gas chamber pressure sensor. The method includes the following steps: S0. Connect the SF6 pure gas cylinder to the inlet of the recovery pipeline, and calculate the volume V of the quantitative volumetric cylinder using the density formula. 瓶 ; S1. Remove the SF6 pure gas cylinder and connect the gas inlet of the recovery pipeline to the gas filling equipment. Measure the temperature T of the gas chamber before recovery using the gas chamber temperature sensor and gas chamber pressure sensor. G0 and initial pressure P G0 The density ρ of SF6 gas in the gas chamber before recovery was calculated using the Beattie-Bridgman gas law. G0 ; S2. During the recycling process, the bottle temperature sensor and bottle pressure sensor monitor the temperature T of the quantitative volumetric bottle at the time of quantitative measurement. p and pressure P p Measurements were performed, and the quantitative density ρ of SF6 gas in the quantitative volumetric bottle was calculated using the Beattie-Bridgman gas law. p ; S3. Calculate the quantitative density ρ of SF6 gas for each step. p The gas volume ρ is obtained by summing the measurements, and the gas volume measured by the quantitative volume bottle is calculated using the density formula. This gas volume is equal to the gas volume Δm that is reduced in the gas chamber. S4. During the recycling process, the temperature T of the gas chamber before and after quantitative measurement in the quantitative volumetric bottle is measured using the gas chamber temperature sensor and the gas chamber pressure sensor, respectively. G1 T G2 and pressure P G1 P G2 For pressure P G1 P G2 After dynamic pressure compensation, the SF6 gas density ρ in the gas chamber before and after quantitative measurement was calculated using the Beattie-Bridgman gas state equation. G1 ρ G2 The volume V of the air chamber was calculated using the density formula. 室 The total amount of gas in the gas chamber before recovery (m) 室 ; S5. During the recovery process, the gas chamber temperature sensor and gas chamber pressure sensor monitor the real-time temperature T of the gas chamber. Gi and real-time pressure P Gi The real-time SF6 gas density ρ in the gas chamber was calculated using the Beattie-Bridgman gas state equation. Gi The real-time density ρ of SF6 in the gas chamber Gi And the density ρ of SF6 gas before recycling G0 Calculate the real-time gas recovery rate during the recovery process; S6. After recovery, the temperature T of the gas chamber after recovery is measured by the gas chamber temperature sensor and the gas chamber pressure sensor, respectively. G3 and the pressure P after recovery G3 The density ρ of SF6 gas in the gas chamber after recovery was calculated using the Beattie-Bridgman gas law. G3 This allows for the calculation of the actual gas volume in the current gas chamber, the amount of gas recovered, and the final gas recovery rate. In step S4, the dynamic pressure compensation method is as follows: S41. The control device controls the opening degree of the first electric regulating valve and measures the dynamic pressure value in the open state and the static pressure value in the closed state through the air chamber pressure sensor. S42. Repeat step S41 multiple times to obtain multiple sets of dynamic and static pressure data, fit the data into a dynamic pressure curve, and deduce the pressure change pattern. S43. The air chamber pressure sensor measures the pressure P in the air chamber before and after quantitative measurement using the quantitative volumetric flask. G1 P G2 Pressure P G1 P G2 The pressure is corrected according to the pressure change pattern to obtain the corrected pressure P. G11 P G21 ; S44, Corrected pressure P G11 P G21 The SF6 gas density ρ in the gas chamber before and after quantitative determination was calculated using the Beattie-Bridgman gas law. G1 ρ G2 .

2. The SF6 gas recovery accounting method as described in claim 1, characterized in that, In step S0, the method for calculating the volume of the quantitative volumetric bottle is as follows: S01. Before the measurement begins, use a precision electronic scale to measure the weight m0 of the SF6 pure gas cylinder and connect the SF6 pure gas cylinder to the inlet of the recovery pipeline. S02. Open the first electric regulating valve and the solenoid valve. Measure the initial temperature T0 and initial pressure P0 of the quantitative volumetric bottle according to the temperature sensor and pressure sensor inside the bottle, respectively. Calculate the SF6 gas density ρ0 before filling the quantitative volumetric bottle using the Beattie-Bridgman gas state equation. S03. Open the valve of the SF6 pure gas cylinder, fill the quantitative volumetric bottle with gas to a certain pressure, and then close the valve. Measure the final temperature T1 and final pressure P1 of the quantitative volumetric bottle according to the temperature sensor and pressure sensor inside the bottle, and calculate the SF6 gas density ρ1 after filling the quantitative volumetric bottle using the Beattie-Bridgman gas state equation. S04. Remove the SF6 pure gas cylinder and measure the weight m1 of the SF6 pure gas cylinder after it is fully filled with gas. S05. Substitute the weights m0 and m1 of the SF6 pure gas cylinder before and after filling, and the densities ρ0 and ρ1 of the quantitative volumetric bottle before and after filling, into the formula. Obtain the volume value V of the quantitative volumetric flask.

3. The SF6 gas recovery accounting method as described in claim 2, characterized in that: Repeat steps S01 to S05 multiple times, summing the volume values ​​V obtained from each measurement bottle and taking the average to obtain the final volume V of the measurement bottle. 瓶 .

4. The SF6 gas recovery accounting method as described in claim 1 or 2, characterized in that: The Beattie-Bridgman equation of state is as follows: P=(RTB-A)ρ 2 +RTp A=73.882×10 -5 -5.132105×10 -7 r B=2.50695×10 -3 -2.12283×10 -6 r R=56.9502×10 -5 Where T is the gas temperature measured by the temperature sensor, P is the pressure measured by the pressure sensor, and ρ is the SF6 gas density.

5. The SF6 gas recovery accounting method as described in claim 1, characterized in that: The recovery pipeline includes a gas tube and a first electric regulating valve, a solenoid valve, and a second electric regulating valve installed sequentially on the gas tube. A metering volume bottle is placed between the solenoid valve and the second electric regulating valve. The first electric regulating valve is used to regulate the gas flow rate of the recovery pipeline between the metering volume bottle and the gas tube inlet. The second electric regulating valve is used to regulate the gas flow rate of the recovery pipeline between the metering volume bottle and the gas tube outlet.

6. The SF6 gas recovery accounting method as described in claim 5, characterized in that: It also includes a control device, in which the first electric regulating valve, the solenoid valve, the second electric regulating valve, the bottle internal temperature sensor, the bottle internal pressure sensor, the gas chamber temperature sensor, and the gas chamber pressure sensor are all electrically connected to the control device.

7. The SF6 gas recovery accounting method as described in claim 1, characterized in that, In step S4, the SF6 gas density ρ in the gas chamber before and after quantitative measurement is... G1 ρ G2 Substituting the amount of gas reduced in the chamber during the recovery process, Δm, into the following formula, we can obtain the volume V of the chamber. 室 : ； The SF6 gas density ρ in the gas chamber before recovery G0 and the volume V of the air chamber 室 Substitute into the following formula to obtain the total amount of gas m in the gas chamber before recovery. 室 : 。 8. The SF6 gas recovery accounting method as described in claim 1, characterized in that, In step S5, the real-time density ρ of the gas chamber during the recovery process is recorded. Gi and the SF6 gas density ρ in the gas chamber before recovery G0 Substitute into the following formula to obtain the real-time gas recovery rate during the recovery process: 。 9. The SF6 gas recovery accounting method as described in claim 1, characterized in that, In step S6, the gas chamber is filled with SF6 gas after recovery, and the gas density ρ is... G3 and the volume V of the air chamber 室 Substitute into the following formula to obtain the actual gas quantity m in the current gas chamber. 实际 : ； The total amount of gas in the gas chamber before recovery is m 室 And the actual gas volume m in the current gas chamber 实际 Substitute into the following formula to obtain the amount of gas recovered in the gas chamber, m. 回收 : m 回收 =Total gas m 室 - Actual gas quantity m 实际 ; The density ρ of the recovered SF6 gas in the gas chamber G3 And the SF6 gas density ρ in the gas chamber before recovery G0 Substitute into the following formula to obtain the gas recovery rate: 。

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