CN116008116A - Sulfur hexafluoride gas recovery rate measuring device and method - Google Patents
Sulfur hexafluoride gas recovery rate measuring device and method Download PDFInfo
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Abstract
The invention provides a sulfur hexafluoride gas recovery rate measuring device and a sulfur hexafluoride gas recovery rate measuring method, wherein the sulfur hexafluoride gas recovery rate measuring device comprises a sulfur hexafluoride gas recovery device body, a PLC (programmable logic controller), a three-way pipe joint, a constant volume gas storage tank, a temperature sensor and a gravity sensor; the electric equipment air chamber, the constant volume air storage tank and the sulfur hexafluoride gas recovery body are correspondingly connected with an interface of the three-way pipe joint through pipelines respectively, a first electromagnetic valve and a second electromagnetic valve are arranged on the pipelines of the constant volume air storage tank, a third electromagnetic valve is arranged on the pipelines of the sulfur hexafluoride gas recovery body, a pressure sensor and a temperature sensor are arranged between the first electromagnetic valve and the second electromagnetic valve, a gravity sensor is arranged at the low end of the sulfur hexafluoride gas storage device, and the PLC is connected with the pressure sensor, the temperature sensor, the first electromagnetic valve, the second electromagnetic valve, the third electromagnetic valve and the gravity sensor. The method can improve the accuracy of the recovery rate of the sulfur hexafluoride, and has the advantages of scientific principle, convenient operation, high recovery rate measurement accuracy and the like.
Description
Technical Field
The invention relates to the technical field of sulfur hexafluoride gas recovery, in particular to a sulfur hexafluoride gas recovery rate measuring device and a sulfur hexafluoride gas recovery rate measuring method.
Background
Sulfur hexafluoride gas has good electrical insulation performance and good arc extinguishing performance, and is widely applied to ultrahigh voltage electrical equipment such as transformers, circuit breakers, transformers, capacitors and the like. However, the greenhouse effect capacity of sulfur hexafluoride is 23900 times of that of carbon dioxide, the sulfur hexafluoride is classified as one of seven greenhouse effect gases with limited emission by the United nations, the sulfur hexafluoride gas recovery and recycling work significance is great, and the sulfur hexafluoride gas recovery rate is an important index for evaluating the working quality.
Sulfur hexafluoride gas recovery = actual recovered sulfur hexafluoride gas mass/sulfur hexafluoride gas charge in the apparatus, the actual recovered sulfur hexafluoride gas mass is obtained by a gas weighing method, and the sulfur hexafluoride gas charge in the apparatus is mainly obtained by two methods.
First kindThe method is to consult the nameplate of the equipment to obtain the rated inflation quantity m Rated for And rated pressure P Rated for The actual pressure P of the device is measured Actual practice is that of By calculating formula m Actual practice is that of =（m Rated for *P Actual practice is that of ）/P Rated for 。
The second method is disclosed in the Chinese patent specification CN 112520704, a fixed-volume steel cylinder with a known volume is connected with the equipment body, the pressure and temperature changes before and after the fixed-volume steel cylinder is connected with the equipment body are detected, and the gas recovery rate is calculated by using an ideal gas state equation PV=nRT formula.
The two methods have the defects, the information of the nameplate of the equipment is often incomplete in the actual application process of the first method, and the information of the rated inflation quantity, the rated pressure and the like of the equipment is difficult to obtain. In addition, in the first method and the second method, an ideal gas state equation is adopted for calculation, sulfur hexafluoride is typical non-ideal gas, calculation results of the ideal gas state equation have obvious deviation, and the data such as recovery rate and the like are directly caused to have great errors.
Disclosure of Invention
The invention aims to solve the technical problems of the prior art, and provides a sulfur hexafluoride gas recovery rate measuring device and a sulfur hexafluoride gas recovery rate measuring method, which solve the problem that the result of calculating the sulfur hexafluoride gas recovery rate through an ideal gas state equation in the prior art has obvious deviation.
In order to solve the technical problems, the invention adopts the following technical scheme:
a sulfur hexafluoride gas recovery rate measuring device, comprising: the sulfur hexafluoride gas recovery device comprises a sulfur hexafluoride gas recovery device body, a PLC controller, a three-way pipe joint, a constant volume gas storage tank, a temperature sensor and a gravity sensor; the electric equipment air chamber, the constant volume air storage tank and the sulfur hexafluoride gas recovery body are correspondingly connected with the connector of the three-way pipe connector through a first pipeline, a second pipeline and a third pipeline respectively, a first electromagnetic valve and a second electromagnetic valve are arranged on the second pipeline, a third electromagnetic valve is arranged on the third pipeline, a pressure sensor and a temperature sensor are arranged between the first electromagnetic valve and the second electromagnetic valve, a gravity sensor is arranged at the low end of the sulfur hexafluoride gas recovery device body air storage device, and the PLC is connected with the pressure sensor, the temperature sensor, the first electromagnetic valve, the second electromagnetic valve, the third electromagnetic valve and the gravity sensor.
Further, the first interface of the three-way pipe joint is connected with a first pipeline for connecting an air chamber interface of the electrical equipment, the second interface of the three-way pipe joint is connected with a pressure sensor, a temperature sensor and a constant volume air storage tank through a second pipeline, the third interface of the three-way pipe joint is connected with the sulfur hexafluoride gas recovery body through a third pipeline, the gravity sensor is arranged at the air storage device section inside the sulfur hexafluoride gas recovery body device and monitors the gravity of the air storage device at any time, and the PLC is connected with the pressure sensor, the temperature sensor, the gravity sensor, the first electromagnetic valve, the second electromagnetic valve and the third electromagnetic valve through control circuits respectively.
Further, the PLC is used for controlling the opening and closing of the first electromagnetic valve, the second electromagnetic valve and the third electromagnetic valve, introducing sulfur hexafluoride gas in the air chamber of the electrical equipment into a constant volume air storage tank with lower initial pressure by utilizing pressure difference, calculating the gas density of the constant volume air storage tank before and after air release by utilizing the pressure and temperature measured by the pressure sensor and the temperature sensor, then calculating the effective volume of the air chamber of the electrical equipment by combining the relation that the effective volume of the air storage tank and the reduction amount of the sulfur hexafluoride gas in the air chamber of the electrical equipment are equal to the increase amount of the air in the constant volume air storage tank, calculating the inflation amount in the air chamber of the electrical equipment before air release by utilizing the effective volume of the air chamber of the electrical equipment and the gas density of the air chamber of the electrical equipment before air release, calculating the actual sulfur hexafluoride gas recovery amount by utilizing the gravity increment value before and after air recovery of the sulfur hexafluoride gas recovery body measured by utilizing the gravity sensor, and further calculating the actual sulfur hexafluoride gas recovery rate by utilizing the actual sulfur hexafluoride gas recovery amount and the inflation amount in the air chamber before air release of the electrical equipment.
Further, the PLC, the three-way pipe joint, the constant volume air storage tank, the pressure sensor, the temperature sensor, the gravity sensor, the first electromagnetic valve, the second electromagnetic valve and the third electromagnetic valve are all arranged inside the shell of the sulfur hexafluoride gas recovery device body.
Further, the first connector of the three-way pipe connector exposes out of the shell of the sulfur hexafluoride gas recovery device body, and quick connectors are arranged at two ends of the first pipeline.
A sulfur hexafluoride gas recovery rate measurement method performed by the sulfur hexafluoride gas recovery rate device, the method comprising the steps of:
the PLC controls the opening and closing of the first electromagnetic valve, the second electromagnetic valve and the third electromagnetic valve, sulfur hexafluoride gas in the gas chamber of the electrical equipment is led into the constant-volume gas storage tank, and the gas density of the constant-volume gas storage tank before and after deflation is calculated through the pressure sensor and the pressure and the temperature measured by the temperature sensor;
the PLC is combined with the relation that the known effective volume of the constant-volume air storage tank and the gas reduction amount of the air chamber sulfur hexafluoride gas in the electrical equipment is equal to the gas increase amount of the constant-volume air storage tank to calculate the effective volume of the air chamber of the electrical equipment;
the PLC calculates the inflation quantity in the air chamber before the air is discharged by using the effective volume of the air chamber of the electrical equipment and the gas density of the air storage tank with the constant volume after the air is discharged;
the PLC calculates the actual recovered sulfur hexafluoride gas amount by utilizing the gravity increment value before and after the recovery of the sulfur hexafluoride gas recovery body measured by the gravity sensor;
and the PLC calculates the recovery rate of the sulfur hexafluoride gas by utilizing the actual recovery rate of the sulfur hexafluoride gas and the air charge in the air chamber before the electrical equipment is discharged.
Further, the PLC controls the opening and closing of the first electromagnetic valve, the second electromagnetic valve and the third electromagnetic valve, guides sulfur hexafluoride gas in the gas chamber of the electrical equipment into the constant volume gas storage tank, calculates the gas density of the constant volume gas storage tank before and after deflation through the pressure sensor and the pressure and the temperature measured by the temperature sensor, and specifically comprises the following steps:
quick connectors at two ends of a first pipeline are respectively connected with a first connector of a three-way pipe and an air taking connector of an air chamber of electrical equipment;
closing the third electromagnetic valve and the first electromagnetic valve, opening the second electromagnetic valve, and setting the pressure of the constant-volume air storage tank to be P 10 At a temperature ofT 10 The effective volume of the constant-volume air storage tank is known as V 1 ；
Closing the third electromagnetic valve and the second electromagnetic valve, opening the first electromagnetic valve, and measuring the pressure and the temperature of the electrical equipment to be P respectively 20 And T 20 ；
Closing the third electromagnetic valve, opening the first electromagnetic valve and the second electromagnetic valve, enabling gas to enter the constant-volume gas storage tank, closing the first electromagnetic valve when the pressure of the electrical equipment is reduced to a set value or the pressure of the constant-volume gas storage tank is increased to the set value, and measuring that the pressure and the temperature of the constant-volume gas storage tank are P respectively 11 And T 11 ；
Closing the third electromagnetic valve and the second electromagnetic valve, opening the first electromagnetic valve, and measuring the pressure and the temperature of the electrical equipment to be P respectively 21 And T 21 ；
Closing all electromagnetic valves, firstly according to the pressure P of a constant-volume air storage tank 10 Temperature T 10 And constant volume air reservoir pressure P 11 Temperature T 11 The gas density c before the constant volume tank is deflated is calculated by combining the Di-Bridgman empirical formula 10 And post-gassing gas density c 11 。
Further, the PLC controller calculates the effective volume of the air chamber of the electrical apparatus by combining the known effective volume of the air chamber of the constant volume air tank and the relationship that the amount of reduction of sulfur hexafluoride gas in the air chamber of the electrical apparatus is equal to the amount of increase of the air chamber of the constant volume air tank, and specifically includes:
according to the effective volume V of the constant-volume air storage tank 1 And the gas density c after the constant volume tank discharges and deflates 11 Obtaining the mass m of sulfur hexafluoride gas before the constant volume gas storage tank is deflated 10 :
m 10 =c 10 V 1
According to the measured P 20 And T 20 、P 21 And T 21 The density c before the air chamber of the electrical equipment is deflated is calculated by combining the pedicel-Bridgman empirical formula 20 Density c after air chamber deflation of electrical equipment 21 Gas density c after discharging and discharging combined with constant volume tank 11 Density c before air chamber deflation of electrical equipment 20 Density c after air chamber deflation of electrical equipment 21 Separately calculating electrical devicesConstant volume gas storage tank gas mass m after air chamber deflation 11 Gas mass m of gas chamber before deflation of electrical equipment 20 Gas mass m of gas chamber after deflation 21 ；
Since sulfur hexafluoride gas in the gas chamber of the electrical equipment flows into the constant volume gas storage tank, the sulfur hexafluoride gas reduction amount delta m of the gas chamber of the electrical equipment is equal to the gas increase amount of the constant volume gas storage tank:
△m= m 20 - m 21 = m 11 - m 10
according to the effective volume V of the constant-volume air storage tank 1 Density c of gas before deflation of constant volume tank 10 And post-gassing gas density c 11 Obtain the mass m of sulfur hexafluoride gas before and after the constant volume gas storage tank is deflated 10 、m 11 :
m 10 =c 10 V 1
m 11 =c 11 V 1
Thereby calculating Δm;
further obtain:
△m= m 20 - m 21 =c 20 V 2 -c 21 V 2
wherein V is 2 Is the effective volume of an air chamber of the electrical equipment, and the unit is m 3 ；
According to the sulfur hexafluoride gas reduction delta m of the electrical equipment air chamber and the density c before the electrical equipment air chamber is deflated 20 Density c after air chamber deflation of electrical equipment 21 Calculating the effective volume V of the air chamber of the electrical equipment 2 ：
V 2 =△m /（c 20 -c 21 ）。
Further, the PLC calculates the air charge quantity in the air chamber before the air discharge of the electrical equipment by utilizing the effective volume of the air chamber of the electrical equipment and the air density of the air storage tank with constant volume after the air discharge, and specifically comprises the following steps:
the aeration quantity in the air chamber before the air is discharged by the electrical equipment is calculated according to the calculated density c before the air chamber of the electrical equipment is discharged 20 Effective volume V of air chamber of electrical equipment 2 The method comprises the following steps:
m 20 =c 20 V 2。
further, the PLC controller calculates the actual recovered sulfur hexafluoride gas amount by using the gravity increment value before and after the recovery of the sulfur hexafluoride gas recovery body measured by the gravity sensor, and specifically includes:
the gravity value of the storage tank in the sulfur hexafluoride gas recovery device body is measured to be G through the gravity sensor 1 ；
Closing the first electromagnetic valve, the second electromagnetic valve, opening the third electromagnetic valve, starting sulfur hexafluoride gas recovery work, closing the third electromagnetic valve after sulfur hexafluoride gas recovery work is completed, and measuring that the gravity value of a storage tank in the sulfur hexafluoride recovery device body is G through a gravity sensor 2 ；
Gravity increasing value G caused by actual recovery of sulfur hexafluoride gas 21 =G 2 -G 1 Actual recovery of sulfur hexafluoride gas quantity m Actual recovered gas quantity = G 21 G, g is a gravitational constant;
calculating the recovery rate phi=m of sulfur hexafluoride gas by using a PLC (programmable logic controller) Actual recovered gas quantity /m 20 。
The technical scheme of the invention is that devices such as a PLC (programmable logic controller), a three-way pipe joint, a constant volume gas storage tank, a temperature sensor, a pressure sensor, a gravity sensor, a first electromagnetic valve, a second electromagnetic valve, a third electromagnetic valve and the like are additionally arranged on the basis of a traditional sulfur hexafluoride gas recovery device, so that deviation generated by a calculation method of a gas ideal state equation is avoided, a Betty-Bridgman (Bettie-Bridgman) empirical formula with accurate calculation is selected, meanwhile, gravity of recovered gas is directly measured by adopting the gravity sensor, automatic data acquisition and calculation are realized by utilizing the PLC, measurement of sulfur hexafluoride gas recovery rate is realized, and the accuracy of sulfur hexafluoride gas recovery rate measurement is greatly improved.
Drawings
Fig. 1 is a schematic structural view of a sulfur hexafluoride gas recovery rate measuring device of the invention.
Description of the embodiments
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1, the embodiment of the invention provides a sulfur hexafluoride gas recovery rate measuring device, which comprises a sulfur hexafluoride gas recovery device body 1, a PLC controller 2, a three-way pipe connector 3, a constant volume gas storage tank 4, a pressure sensor 5, a temperature sensor 6, a first electromagnetic valve 7, a second electromagnetic valve 8, a third electromagnetic valve 9 and a gravity sensor 10, wherein a first interface of the three-way pipe connector 3 is connected with a first pipeline 12 for connecting a gas taking port of a gas chamber of an electrical device 11, a second interface of the three-way pipe connector 3 is connected with the constant volume gas storage tank 4 through a second pipeline 13, a third interface of the three-way pipe connector 3 is connected with a recovery interface of the sulfur hexafluoride gas recovery device body 1 through a third pipeline 14, the pressure sensor 5 and the temperature sensor 6 are respectively connected between the first electromagnetic valve 7 and the second electromagnetic valve 8 on the second pipeline 13, the gravity sensor 10 is arranged at the lower end of the gas storage device of the sulfur hexafluoride recovery device body 1, the third electromagnetic valve 9 is arranged on the third pipeline 14, and the PLC controller 2 is respectively connected with the pressure sensor 5, the temperature sensor 6, the first electromagnetic valve 7, the second electromagnetic valve 8 and the gravity sensor 10 through control lines.
The PLC 2, the tee joint 3, the constant volume air storage tank 4, the pressure sensor 5, the temperature sensor 6, the first electromagnetic valve 7, the second electromagnetic valve 8, the third electromagnetic valve 9 and the gravity sensor 10 are all arranged inside the shell of the sulfur hexafluoride gas recovery device body.
The first interface of the three-way pipe joint 3 exposes out of the shell of the sulfur hexafluoride gas recovery device body 11, and two ends of the first pipeline 12 are respectively provided with a quick connector.
By adopting the technical scheme, the volumes of the first pipeline 12, the second pipeline 13, the third pipeline 14, the three-way pipe joint 3, the first electromagnetic valve 7, the second electromagnetic valve 8, the third electromagnetic valve 9 and the fixed-volume air storage tank 4 are all known, and the volumes of the first pipeline 12, the second pipeline 13, the third pipeline 14, the three-way pipe joint 3, the first electromagnetic valve 7, the second electromagnetic valve 8 and the third electromagnetic valve 9 are far smaller than the volumes of the air chamber of the electrical equipment 11 and the fixed-volume air storage tank 4, so that the volumes are negligible in measurement. Temperature data measured by the temperature sensor 5 can be transmitted to the PLC controller 3, pressure data measured by the pressure sensor 5 can be transmitted to the PLC controller 3, gravity data measured by the gravity sensor 10 can be transmitted to the PLC controller 3, the PLC controller 3 can control the start and stop of the sulfur hexafluoride gas recovery device body 1, and the PLC controller 3 can control the start and stop of the first electromagnetic valve 7, the second electromagnetic valve 8 and the third electromagnetic valve 9.
The embodiment of the invention also provides a measurement method for the recovery rate of sulfur hexafluoride gas, wherein the measurement principle is a Betty-Bridgman (Beattie-Bridgman) empirical formula:
P=56.2cT(1+B)- c 2 A (1)
A=74.9(1-0.727×10 -3 c)
B=2.51×10 -3 c(1-0.846×10 -3 c)
wherein:
P—SF 6 absolute pressure of the gas in MPa;
c—SF 6 density of gas in kg/m 3 ；
R-gas constant, unit is J/(kg.K), SF 6 56.2J/(kg. K)
T—SF 6 The thermodynamic temperature of the gas is given in K.
According to the technical scheme, the effective volume is measured by detecting the pressure change of the electrical equipment 11 in the process of charging/discharging through the pressure sensor 5 and the temperature sensor 6, the charging amount of sulfur hexafluoride gas in the electrical equipment 11 is obtained through calculation, the actual recovery amount of the sulfur hexafluoride gas is obtained through monitoring and obtaining the gravity change through the gravity sensor 10, and therefore the recovery rate of the sulfur hexafluoride gas is obtained.
The specific steps are as follows (taking the deflation process as an example, the inflation is equivalent to the reverse process):
(1) Quick connectors at two ends of a first pipeline 12 are respectively connected with a first connector of a three-way pipe 3 and an air taking connector of an air chamber of electrical equipment 11;
(2) The third electromagnetic valve 9 and the first electromagnetic valve 7 are closed by the PLC 2, the second electromagnetic valve 8 is opened, and the pressure of the constant-volume air storage tank 4 is P 10 = 0.10008MPa, temperature T 10 The effective volume of the constant volume air tank 4 is known as V =293.15k 1 =200L；
(3) The third electromagnetic valve 9 and the second electromagnetic valve 8 are closed by the PLC 2, the first electromagnetic valve 7 is opened, and the pressure and the temperature of the electrical equipment are measured to be P respectively 20 =0.5 MPa and T 20 =293.15K；
(4) The third electromagnetic valve 9 is closed by the PLC 2, the first electromagnetic valve 7 and the second electromagnetic valve 8 are opened, gas enters the constant-volume gas storage tank 4, the first electromagnetic valve 7 is closed when the pressure of the electric equipment 11 is reduced to a set value or the pressure of the constant-volume gas storage tank 4 is increased to the set value, and the pressure and the temperature of the constant-volume gas storage tank 4 are measured to be P respectively at the moment 11 = 0.20013MPa and T 11 =294.22K；
(5) The third electromagnetic valve 9 and the second electromagnetic valve 8 are closed by the PLC 2, the first electromagnetic valve 7 is opened, and the pressure and the temperature of the electrical equipment 11 are measured to be P respectively 21 And T 21 ；
(6) All solenoid valves are closed by the PLC 2 to start calculating the effective volume V of the electrical equipment 11 2 The method specifically comprises the following steps:
firstly, according to the pressure of a constant-volume air storage tank 4, the pressure is P 10 At a temperature T 10 The gas density c before the constant volume gas storage tank 4 is deflated is calculated by combining the 1 Betty-Bridgman (Bettie-Bridgman) empirical formula 10 =5.85617kg/m 3 ；
Also, based on the measured P 11 =0.2 MPa and T 11 = 294.22K, the combination of (1) can calculate the gas density c of the deflated constant volume gas tank 4 11 =11.80929kg/m 3
From the pressure sensor 5 and the temperature sensor 6, P before the air chamber of the electrical equipment 11 is deflated is measured 20 = 0.50011MPa and T 20 =293.15K, post-gassing P 21 = 0.44666MPa and T 21 =293.25K。
According to formula (1), calculate
Density c before air chamber deflation of electrical equipment 11 20 =30.81922kg/m 3 ，
Density c of electric equipment 11 after air chamber deflation 21 =27.31762kg/m 3 。
Since sulfur hexafluoride gas in the air chamber of the electric equipment 11 flows into the constant volume air storage tank 4, the reduction amount of sulfur hexafluoride gas in the air chamber of the electric equipment 11 is equal to the increase amount of the gas in the constant volume air storage tank 4:
△m=m 20 -m 21 =m 11 -m 10
due to the effective volume V of the constant volume air storage tank 4 1 Known by 200L, so as to obtain the mass m of sulfur hexafluoride gas before and after the constant volume gas storage tank 4 is deflated 10 、m 11 :
m 10 =c 10 V 1 =5.85617*0.2=1.17123kg
m 11 =c 11 V 1 =11.80929*0.2=2.36186kg
Thus Δm= 1.19063kg can be calculated.
Further obtain:
△m= m 20 -m 21 =c 20 V 2 -c 21 V 2
wherein V is 2 Is the effective volume of the air chamber of the electrical equipment 11, and the unit is m 3 。
V 2 =△m /（c 20 -c 21 ）=1.19063/（30.81922-27.31762）=0.34002m 3
Air charge in air chamber before air discharge of electric equipment 11
m 20 =c 20 V 2 =30.81922*0.34002=10.47915kg
(7) The PLC 2 measures that the gravity value of the sulfur hexafluoride gas recovery device body 1 is G through the gravity sensor 10 1 =4116.12132N。
(8) Closing the first electromagnetic valve 7 and the second electromagnetic valve 8, opening the third electromagnetic valve 9, starting sulfur hexafluoride gas recovery work, closing the third electromagnetic valve 9 after sulfur hexafluoride gas recovery work is completed,the gravity value G of the storage tank in the sulfur hexafluoride recovery device body 1 is measured by the gravity sensor 10 2 =4216.96852N。
(9) Gravity increasing value G caused by actual recovery of sulfur hexafluoride gas 21 =G 2 -G 1 100.84720N, the actual recovered sulfur hexafluoride gas quantity m Actual recovered gas quantity =G 21 /g, = 10.29053kg (gravitational constant g=9.8N/kg).
(10) The PLC 2 calculates the recovery rate of sulfur hexafluoride gas
φ=m Actual recovered gas quantity /m 20 =10.29053/10.47915=98.20%。
One of the preconditions for accurately calculating the recovery rate of sulfur hexafluoride gas is to accurately obtain the aeration rate of the electrical equipment, and the effective volume of the content of the electrical equipment cannot be accurately measured because various parts with different shapes are arranged in the electrical equipment, so that the aeration rate of the electrical equipment cannot be accurately calculated. At present, the sulfur hexafluoride gas charging amount in the equipment is mainly achieved through the following two indirect methods. The first method is to refer to the nameplate of the equipment to obtain the rated inflation amount m Rated for And rated pressure P Rated for The actual pressure P of the device is measured Actual practice is that of By calculating formula m Actual practice is that of =（m Rated for *P Actual practice is that of ）/P Rated for . The second method calculates the gas recovery using the ideal gas state equation pv=nrt equation. The two methods belong to indirect estimation methods, and in the calculation process, an ideal gas state equation is adopted for calculation, sulfur hexafluoride is typical non-ideal gas, the deviation of the calculation result of the ideal gas state equation is obvious, and the extremely large error of the recovery rate and other data is directly caused. The invention thoroughly solves the problem that the recovery rate of sulfur hexafluoride gas cannot be directly measured and calculated, provides a brand new technical method, recovers sulfur hexafluoride gas, simultaneously accurately calculates the effective volume and the charging capacity of the electrical equipment, and combines a direct weighing method to accurately measure and calculate the recovery rate of sulfur hexafluoride gas.
The foregoing is merely illustrative embodiments of the present invention, and the present invention is not limited thereto, and any changes or substitutions that may be easily contemplated by those skilled in the art within the scope of the present invention should be included in the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.
Claims (10)
1. A sulfur hexafluoride gas recovery rate measuring device, characterized by comprising: the sulfur hexafluoride gas recovery device comprises a sulfur hexafluoride gas recovery device body, a PLC controller, a three-way pipe joint, a constant volume gas storage tank, a temperature sensor and a gravity sensor; the electric equipment air chamber, the constant volume air storage tank and the sulfur hexafluoride gas recovery body are correspondingly connected with the connector of the three-way pipe connector through a first pipeline, a second pipeline and a third pipeline respectively, a first electromagnetic valve and a second electromagnetic valve are arranged on the second pipeline, a third electromagnetic valve is arranged on the third pipeline, a pressure sensor and a temperature sensor are arranged between the first electromagnetic valve and the second electromagnetic valve, a gravity sensor is arranged at the low end of the sulfur hexafluoride gas recovery device body air storage device, and the PLC is connected with the pressure sensor, the temperature sensor, the first electromagnetic valve, the second electromagnetic valve, the third electromagnetic valve and the gravity sensor.
2. The sulfur hexafluoride gas recovery rate measuring device according to claim 1, wherein: the first interface of the three-way pipe joint is connected with a first pipeline for connecting an air chamber interface of the electrical equipment, the second interface of the three-way pipe joint is connected with a pressure sensor, a temperature sensor and a constant volume air storage tank through a second pipeline, the third interface of the three-way pipe joint is connected with a sulfur hexafluoride gas recovery body through a third pipeline, a gravity sensor is arranged at a gas storage device section inside the sulfur hexafluoride gas recovery body device and monitors gravity of the gas storage device at any time, and a PLC is connected with the pressure sensor, the temperature sensor, the gravity sensor, the first electromagnetic valve, the second electromagnetic valve and the third electromagnetic valve through control circuits respectively.
3. The sulfur hexafluoride gas recovery rate measuring device according to claim 1, wherein: the PLC is used for controlling the opening and closing of the first electromagnetic valve, the second electromagnetic valve and the third electromagnetic valve, introducing sulfur hexafluoride gas in the air chamber of the electrical equipment into a constant volume air storage tank with lower initial pressure by utilizing pressure difference, calculating the gas density of the constant volume air storage tank before and after air discharge by utilizing the pressure and temperature measured by the pressure sensor and the temperature sensor, then calculating the air chamber effective volume of the electrical equipment by combining the relation that the effective volume of the known constant volume air storage tank and the reduction amount of the sulfur hexafluoride gas in the air chamber of the electrical equipment are equal to the increase amount of the gas in the constant volume air storage tank, calculating the gas charging amount in the air chamber of the electrical equipment before air discharge by utilizing the effective air chamber volume of the electrical equipment and the gas density of the air chamber of the electrical equipment before air discharge, calculating the actual sulfur hexafluoride gas recovery amount by utilizing the gravity increase value before and after air recovery of the sulfur hexafluoride gas recovery body measured by utilizing the gravity sensor, and further calculating the actual sulfur hexafluoride gas recovery rate by utilizing the actual sulfur hexafluoride gas recovery amount and the gas charging amount in the air chamber before air discharge of the electrical equipment.
4. The sulfur hexafluoride gas recovery rate measuring device according to claim 1, wherein: the PLC, the three-way pipe joint, the constant volume air storage tank, the pressure sensor, the temperature sensor, the gravity sensor, the first electromagnetic valve, the second electromagnetic valve and the third electromagnetic valve are all arranged inside the shell of the sulfur hexafluoride gas recovery device body.
5. The sulfur hexafluoride gas recovery rate measuring device according to claim 2, wherein: the first interface of three-way pipe joint exposes the shell of sulfur hexafluoride gas recovery device body, and the both ends of first pipeline all are equipped with quick-operation joint.
6. A method for measuring sulfur hexafluoride gas recovery rate, characterized by using the sulfur hexafluoride gas recovery rate apparatus according to any one of claims 1 to 5, said method comprising the steps of:
the PLC controls the opening and closing of the first electromagnetic valve, the second electromagnetic valve and the third electromagnetic valve, sulfur hexafluoride gas in the gas chamber of the electrical equipment is led into the constant-volume gas storage tank, and the gas density of the constant-volume gas storage tank before and after deflation is calculated through the pressure sensor and the pressure and the temperature measured by the temperature sensor;
the PLC is combined with the relation that the known effective volume of the constant-volume air storage tank and the gas reduction amount of the air chamber sulfur hexafluoride gas in the electrical equipment is equal to the gas increase amount of the constant-volume air storage tank to calculate the effective volume of the air chamber of the electrical equipment;
the PLC calculates the inflation quantity in the air chamber before the air is discharged by using the effective volume of the air chamber of the electrical equipment and the gas density of the air storage tank with the constant volume after the air is discharged;
the PLC calculates the actual recovered sulfur hexafluoride gas amount by utilizing the gravity increment value before and after the recovery of the sulfur hexafluoride gas recovery body measured by the gravity sensor;
and the PLC calculates the recovery rate of the sulfur hexafluoride gas by utilizing the actual recovery rate of the sulfur hexafluoride gas and the air charge in the air chamber before the electrical equipment is discharged.
7. The method for measuring the recovery rate of sulfur hexafluoride gas according to claim 6, wherein: the PLC controller controls the opening and closing of the first electromagnetic valve, the second electromagnetic valve and the third electromagnetic valve, guides sulfur hexafluoride gas in the gas chamber of the electrical equipment into the constant volume gas storage tank, calculates the gas density of the constant volume gas storage tank before and after deflation through the pressure sensor and the pressure and the temperature measured by the temperature sensor, and specifically comprises the following steps:
quick connectors at two ends of a first pipeline are respectively connected with a first connector of a three-way pipe and an air taking connector of an air chamber of electrical equipment;
closing the third electromagnetic valve and the first electromagnetic valve, opening the second electromagnetic valve, and setting the pressure of the constant-volume air storage tank to be P 10 At a temperature T 10 The effective volume of the constant-volume air storage tank is known as V 1 ；
Closing the third electromagnetic valve and the second electromagnetic valve, opening the first electromagnetic valve, and measuring the pressure and the temperature of the electrical equipment to be P respectively 20 And T 20 ；
Closing the third electromagnetic valve, opening the first electromagnetic valve and the second electromagnetic valve, enabling gas to enter the constant-volume gas storage tank, and enabling the pressure of the electrical equipment to drop to a set value or the pressure of the constant-volume gas storage tankWhen the force rises to the set value, the first electromagnetic valve is closed, and the pressure and the temperature of the constant volume tank are measured to be P respectively 11 And T 11 ；
Closing the third electromagnetic valve and the second electromagnetic valve, opening the first electromagnetic valve, and measuring the pressure and the temperature of the electrical equipment to be P respectively 21 And T 21 ；
Closing all electromagnetic valves, firstly according to the pressure P of a constant-volume air storage tank 10 Temperature T 10 And constant volume air reservoir pressure P 11 Temperature T 11 The gas density c before the constant volume tank is deflated is calculated by combining the Di-Bridgman empirical formula 10 And post-gassing gas density c 11 。
8. The method for measuring the recovery rate of sulfur hexafluoride gas according to claim 7, wherein: the PLC is combined with the known effective volume of the constant volume air storage tank and the relation that the reduction amount of sulfur hexafluoride gas in the air chamber of the electrical equipment is equal to the increase amount of the gas in the constant volume air storage tank to calculate the effective volume of the air chamber of the electrical equipment, and the method specifically comprises the following steps:
according to the effective volume V of the constant-volume air storage tank 1 And the gas density c after the constant volume tank discharges and deflates 11 Obtaining the mass m of sulfur hexafluoride gas before the constant volume gas storage tank is deflated 10 :
m 10 =c 10 V 1
According to the measured P 20 And T 20 、P 21 And T 21 The density c before the air chamber of the electrical equipment is deflated is calculated by combining the pedicel-Bridgman empirical formula 20 Density c after air chamber deflation of electrical equipment 21 Gas density c after discharging and discharging combined with constant volume tank 11 Density c before air chamber deflation of electrical equipment 20 Density c after air chamber deflation of electrical equipment 21 Respectively calculating the gas mass m of the constant-volume gas storage tank after the gas chamber of the electrical equipment is deflated 11 Gas mass m of gas chamber before deflation of electrical equipment 20 Gas mass m of gas chamber after deflation 21 ；
Since sulfur hexafluoride gas in the gas chamber of the electrical equipment flows into the constant volume gas storage tank, the sulfur hexafluoride gas reduction amount delta m of the gas chamber of the electrical equipment is equal to the gas increase amount of the constant volume gas storage tank:
△m= m 20 - m 21 = m 11 - m 10
according to the effective volume V of the constant-volume air storage tank 1 Density c of gas before deflation of constant volume tank 10 And post-gassing gas density c 11 Obtain the mass m of sulfur hexafluoride gas before and after the constant volume gas storage tank is deflated 10 、m 11 :
m 10 =c 10 V 1
m 11 =c 11 V 1
Thereby calculating Δm;
further obtain:
△m= m 20 - m 21 =c 20 V 2 -c 21 V 2
wherein V is 2 Is the effective volume of an air chamber of the electrical equipment, and the unit is m 3 ；
According to the sulfur hexafluoride gas reduction delta m of the electrical equipment air chamber and the density c before the electrical equipment air chamber is deflated 20 Density c after air chamber deflation of electrical equipment 21 Calculating the effective volume V of the air chamber of the electrical equipment 2 ：
V 2 =△m /（c 20 -c 21 ）。
9. The method for measuring the recovery rate of sulfur hexafluoride gas according to claim 8, wherein: the PLC calculates the air charge quantity in the air chamber before the air discharge of the electrical equipment by utilizing the effective volume of the air chamber of the electrical equipment and the air density of the air storage tank with fixed volume after the air discharge, and specifically comprises the following steps:
the aeration quantity in the air chamber before the air is discharged by the electrical equipment is calculated according to the calculated density c before the air chamber of the electrical equipment is discharged 20 Effective volume V of air chamber of electrical equipment 2 The method comprises the following steps:
m 20 =c 20 V 2。
10. the method for measuring the recovery rate of sulfur hexafluoride gas according to claim 8, wherein: the PLC calculates the actual recovered sulfur hexafluoride gas amount by utilizing the gravity increment value before and after the recovery of the sulfur hexafluoride gas recovery body measured by the gravity sensor, and specifically comprises the following steps:
the gravity value of the storage tank in the sulfur hexafluoride gas recovery device body is measured to be G through the gravity sensor 1 ；
Closing the first electromagnetic valve, the second electromagnetic valve, opening the third electromagnetic valve, starting sulfur hexafluoride gas recovery work, closing the third electromagnetic valve after sulfur hexafluoride gas recovery work is completed, and measuring that the gravity value of a storage tank in the sulfur hexafluoride recovery device body is G through a gravity sensor 2 ；
Gravity increasing value G caused by actual recovery of sulfur hexafluoride gas 21 =G 2 -G 1 Actual recovery of sulfur hexafluoride gas quantity m Actual recovered gas quantity = G 21 G, g is a gravitational constant;
calculating the recovery rate phi=m of sulfur hexafluoride gas by using a PLC (programmable logic controller) Actual recovered gas quantity /m 20 。
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Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003001046A (en) * | 2001-06-15 | 2003-01-07 | Mitsubishi Electric Corp | Gaseous sulfur hexafluoride recovering equipment |
| CN105864632A (en) * | 2016-05-20 | 2016-08-17 | 国家电网公司 | Mobile device for rapid recovery and supplementation of sulfur hexafluoride-carbon tetrafluoride gas mixture |
| CN108107355A (en) * | 2017-12-20 | 2018-06-01 | 国网河北省电力有限公司电力科学研究院 | A kind of SF6And SF6Mixed gas density monitor calibration equipment and method |
| CN208833887U (en) * | 2018-08-15 | 2019-05-07 | 国网浙江省电力有限公司电力科学研究院 | A kind of multrirange sulfur hexafluoride density relay tester |
| CN112520704A (en) * | 2020-11-26 | 2021-03-19 | 河南省日立信股份有限公司 | Sulfur hexafluoride gas recovery device and recovery rate measurement method |
| CN112556775A (en) * | 2020-11-27 | 2021-03-26 | 国网安徽省电力有限公司电力科学研究院 | Gradient inflation and deflation type SF (sulfur hexafluoride) based on weighing method6Method for measuring volume of gas chamber |
| CN112556773A (en) * | 2020-11-27 | 2021-03-26 | 国网安徽省电力有限公司电力科学研究院 | Gradient air-release type SF based on weighing method6Method for measuring volume of gas chamber |
| CN113807546A (en) * | 2021-08-10 | 2021-12-17 | 国网山东省电力公司电力科学研究院 | Sulfur hexafluoride recycling management system and method based on block chain |
| CN114167269A (en) * | 2021-11-28 | 2022-03-11 | 厦门加华电力科技有限公司 | SF (sulfur hexafluoride)6Density relay first pressure drop checking device |
| CN114397224A (en) * | 2021-12-09 | 2022-04-26 | 河南省日立信股份有限公司 | Sulfur hexafluoride gas recovery rate measuring device and measuring method |
-
2023
- 2023-03-17 CN CN202310256890.1A patent/CN116008116B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003001046A (en) * | 2001-06-15 | 2003-01-07 | Mitsubishi Electric Corp | Gaseous sulfur hexafluoride recovering equipment |
| CN105864632A (en) * | 2016-05-20 | 2016-08-17 | 国家电网公司 | Mobile device for rapid recovery and supplementation of sulfur hexafluoride-carbon tetrafluoride gas mixture |
| CN108107355A (en) * | 2017-12-20 | 2018-06-01 | 国网河北省电力有限公司电力科学研究院 | A kind of SF6And SF6Mixed gas density monitor calibration equipment and method |
| CN208833887U (en) * | 2018-08-15 | 2019-05-07 | 国网浙江省电力有限公司电力科学研究院 | A kind of multrirange sulfur hexafluoride density relay tester |
| CN112520704A (en) * | 2020-11-26 | 2021-03-19 | 河南省日立信股份有限公司 | Sulfur hexafluoride gas recovery device and recovery rate measurement method |
| CN112556775A (en) * | 2020-11-27 | 2021-03-26 | 国网安徽省电力有限公司电力科学研究院 | Gradient inflation and deflation type SF (sulfur hexafluoride) based on weighing method6Method for measuring volume of gas chamber |
| CN112556773A (en) * | 2020-11-27 | 2021-03-26 | 国网安徽省电力有限公司电力科学研究院 | Gradient air-release type SF based on weighing method6Method for measuring volume of gas chamber |
| CN113807546A (en) * | 2021-08-10 | 2021-12-17 | 国网山东省电力公司电力科学研究院 | Sulfur hexafluoride recycling management system and method based on block chain |
| CN114167269A (en) * | 2021-11-28 | 2022-03-11 | 厦门加华电力科技有限公司 | SF (sulfur hexafluoride)6Density relay first pressure drop checking device |
| CN114397224A (en) * | 2021-12-09 | 2022-04-26 | 河南省日立信股份有限公司 | Sulfur hexafluoride gas recovery rate measuring device and measuring method |
Non-Patent Citations (2)
| Title |
|---|
| WEI LIU 等: "Application and Recycling of SF6 gas Mixtures in Gas-insulated Circuit Breaker in Northern China", 3RD INTERNATIONAL CONFERENCE ON ADVANCES IN ENERGY, ENVIRONMENT AND CHEMICAL ENGINEERING, vol. 69, pages 1 - 4 * |
| 张文英: "含六氟化硫的电气设备中气体的监测及SF6 的回收", 科技创新导报, no. 31, pages 115 * |
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