阅读说明：本技术 一种六氟化硫气体回收装置及回收率测量方法 (Sulfur hexafluoride gas recovery device and recovery rate measurement method ) 是由 汪献忠 李建国 孙明 孙付华 于 2020-11-26 设计创作，主要内容包括：一种六氟化硫气体回收装置及回收率测量方法,包括回收装置本体、PLC控制器、五通管接头、气罐、温度传感器、压力传感器、第一电磁阀和第二电磁阀,五通管接头的第一个接口连接有第一管路,五通管接头的第二个接口通过第二管路与回收装置本体连接,五通管接头的第三个接口通过第三管路与气罐连接,温度传感器和压力传感器分别安装在五通管接头的第三个接口和第四个接口上,第一电磁阀安装在第三管路上,第二电磁阀安装在第四管路上。本发明可以实现六氟化硫气体回收率的测量,解决了过去无法获取六氟化硫气体回收作业回收率关键指标,具有原理科学、操作方便、回收率测试数据精确度高的优点。(A sulfur hexafluoride gas recovery device and a recovery rate measuring method comprise a recovery device body, a PLC, a five-way pipe joint, a gas tank, a temperature sensor, a pressure sensor, a first electromagnetic valve and a second electromagnetic valve, wherein a first interface of the five-way pipe joint is connected with a first pipeline, a second interface of the five-way pipe joint is connected with the recovery device body through a second pipeline, a third interface of the five-way pipe joint is connected with the gas tank through a third pipeline, the temperature sensor and the pressure sensor are respectively installed on a third interface and a fourth interface of the five-way pipe joint, the first electromagnetic valve is installed on the third pipeline, and the second electromagnetic valve is installed on a fourth pipeline. The method can realize the measurement of the recovery rate of the sulfur hexafluoride gas, solves the problem that key indexes of the recovery rate of sulfur hexafluoride gas recovery operation cannot be obtained in the past, and has the advantages of scientific principle, convenience in operation and high accuracy of recovery rate test data.)

1. A sulfur hexafluoride gas recovery device is characterized in that: including the recovery unit body, the PLC controller, five-way pipe connects, the gas pitcher, a weighing sensor and a temperature sensor, pressure sensor, first solenoid valve and second solenoid valve, the first interface connection of five-way pipe connects has the first pipeline that is used for connecting the air chamber of electrical equipment and connects, the second interface of five-way pipe connects passes through the second pipeline and is connected with the recovery port of recovery unit body, the third interface of five-way pipe connects passes through the third pipeline and is connected with the gas pitcher, temperature sensor and pressure sensor install respectively on the third interface and the fourth interface of five-way pipe connects, first solenoid valve is installed on the third pipeline, the second solenoid valve is installed on the fourth pipeline, the PLC controller pass through control scheme respectively with temperature sensor, a pressure sensor, first solenoid valve and second solenoid valve are connected.

2. The sulfur hexafluoride gas recovery device according to claim 1, wherein: the PLC controller, the five-way pipe joint, the gas tank, the temperature sensor, the pressure sensor, the first electromagnetic valve and the second electromagnetic valve are all installed inside the shell of the recovery device body.

3. A sulfur hexafluoride gas recovery device according to claim 2, wherein: the first interface of five-way pipe connects exposes the shell of recovery unit body, and the both ends of first pipeline all are equipped with quick-operation joint.

4. A recovery rate measuring method using the sulfur hexafluoride gas recovery apparatus according to claim 3, wherein: the method comprises the following steps:

(1) connecting quick connectors at two ends of a first pipeline with a first connector of a five-way pipe connector and a gas chamber connector of electrical equipment respectively;

(2) closing the first electromagnetic valve and the second electromagnetic valve, opening the valve of the air chamber of the electrical equipment, and measuring the temperature T through the temperature sensor at the moment₁Measuring pressure P by means of a pressure sensor₁At the moment, the mass m of the gas in the gas chamber before recovery can be calculated according to the ideal gas state equation₁：

According to the equation PV = M/M.RT, wherein M is the molar mass of sulfur hexafluoride gas 146.05g/mol, and R = 8.314J/mol.k is a constant;

m can be obtained₁ = (P₁V_{Electric power} / RT₁) M (one);

V_{electric power}The effective volume of the air chamber of the electrical equipment;

(3) the PLC controller opens the first electromagnetic valve, the electrical equipment air chamber is communicated with the air tank at the moment, sulfur hexafluoride gas can flow into the air tank from the electrical equipment air chamber at the moment, and the volume of the gas at the moment is V_{Electric power}+V_{Pot for storing food}，V_{Pot for storing food}The volume of the gas tank is known, at which time the current temperature T2 is recorded by the temperature sensor and the current pressure P2 is recorded by the pressure sensor;

m can be obtained₁ = [P₂(V_{Electric power}+V_{Pot for storing food}) / RT₂]M (two);

from equation (one) and equation (two), m can be solved₁And V_{Electric power}I.e. the mass of sulfur hexafluoride gas in the electrical equipment before recovery and the effective volume V of the air chamber of the electrical equipment_{Electric power}Two variables can be solved;

(4) the PLC controller opens the second electromagnetic valve and opens, start the recovery unit body and carry out gas recovery, gas in the electrical equipment air chamber and the gas tank can be retrieved to storage tank or steel bottle in the recovery unit through recovery unit after beginning to retrieve, surplus gas will be less and less in the electrical equipment air chamber, atmospheric pressure is lower and lower, when retrieving the completion, the PLC controller control recovery unit body is closed, and close the second electromagnetic valve simultaneously, measure current temperature T3 through temperature sensor and pressure sensor respectively this moment, pressure P3, can draw the gaseous mass m of remaining sulfur hexafluoride in electrical equipment air chamber and the gas tank after retrieving this moment₃：

m₃ = [P₃(V_{Electric power}+V_{Pot for storing food}) / RT₃]· M

Thus recovered sulfur hexafluoride gas mass m₂= mass m of sulfur hexafluoride gas before recovery₁Mass m of sulfur hexafluoride gas remaining in the gas chamber of the electrical apparatus₃；

(5) PLC controller calculates sulfur hexafluoride gas recovery rate = recoveryMass m of sulfur hexafluoride gas₂Mass m of sulfur hexafluoride gas in gas chamber of electrical equipment before recovery₁。

Technical Field

The invention belongs to the technical field of sulfur hexafluoride gas recovery, and particularly relates to a sulfur hexafluoride gas recovery device and a recovery rate measuring method.

Background

At present, sulfur hexafluoride gas (SF) is known₆) The recovery device can only recover sulfur hexafluoride gas from the gas chamber of the electrical equipment to the storage tank or the steel cylinder, and the gas chamber cannot be recovered to an absolute vacuum state in the recovery process, so sulfur hexafluoride gas can remain in the gas chamber, and the recovery rate of sulfur hexafluoride gas is an important control index for evaluating the recovery process of sulfur hexafluoride gas. In order to control the emission of sulfur hexafluoride gas and reduce the harm of the sulfur hexafluoride gas to the environment, the recovery rate of the sulfur hexafluoride gas during the recovery process is strictly controlled to reach the standard. The recovery rate of sulfur hexafluoride gas is equal to the mass of the recovered sulfur hexafluoride gas divided by the mass of the sulfur hexafluoride gas in the gas chamber before recovery, and the mass of the recovered sulfur hexafluoride gas can only be measured by a weighing method on a common sulfur hexafluoride recovery device, but the mass of the gas in the gas chamber before recovery cannot be known, the residual sulfur hexafluoride gas in the gas chamber after recovery operation is finished cannot be known, and therefore the recovery rate of the sulfur hexafluoride gas cannot be known.

Disclosure of Invention

The invention aims to solve the defects in the prior art and provides a sulfur hexafluoride gas recovery device and a recovery rate measuring method, which can measure the quality of sulfur hexafluoride gas before being recovered in a gas chamber of electrical equipment and the residual quality of sulfur hexafluoride gas in the gas chamber after being recovered while recovering the sulfur hexafluoride gas, so that the recovery rate index of sulfur hexafluoride gas recovery operation can be obtained. .

In order to solve the technical problems, the invention adopts the following technical scheme: the utility model provides a sulfur hexafluoride gas recovery device, including the recovery unit body, the PLC controller, the five-way pipe connects, the gas pitcher, a weighing sensor and a temperature sensor, pressure sensor, first solenoid valve and second solenoid valve, the first interface connection of five-way pipe connects has the first pipeline that is used for connecting electrical equipment's air chamber connects, the second interface of five-way pipe connects passes through the second pipeline and is connected with the recovery port of recovery unit body, the third interface of five-way pipe connects passes through the third pipeline and is connected with the gas pitcher, temperature sensor and pressure sensor install respectively on the third interface and the fourth interface of five-way pipe connects, first solenoid valve is installed on the third pipeline, the second solenoid valve is installed on the fourth pipeline, the PLC controller pass through control scheme respectively with temperature sensor, pressure sensor, first solenoid valve and second solenoid valve are connected.

The PLC controller, the five-way pipe joint, the gas tank, the temperature sensor, the pressure sensor, the first electromagnetic valve and the second electromagnetic valve are all installed inside the shell of the recovery device body.

The first interface of five-way pipe connects exposes the shell of recovery unit body, and the both ends of first pipeline all are equipped with quick-operation joint.

A method for measuring the recovery rate of a sulfur hexafluoride gas recovery device comprises the following steps:

(1) connecting quick connectors at two ends of a first pipeline with a first connector of a five-way pipe connector and a gas chamber connector of electrical equipment respectively;

(2) closing the first electromagnetic valve and the second electromagnetic valve, opening the valve of the air chamber of the electrical equipment, and measuring the temperature T through the temperature sensor at the moment₁Measuring pressure P by means of a pressure sensor₁At the moment, the mass m of the gas in the gas chamber before recovery can be calculated according to the ideal gas state equation₁：

According to the equation PV = M/M.RT, wherein M is the molar mass of sulfur hexafluoride gas 146.05g/mol, and R = 8.314J/mol.k is a constant;

m can be obtained₁ = (P₁V_{Electric power} / RT₁) M (one);

V_{electric power}The effective volume of the air chamber of the electrical equipment;

(3) the PLC controller opens the first electromagnetic valve, the electrical equipment air chamber is communicated with the air tank at the moment, sulfur hexafluoride gas can flow into the air tank from the electrical equipment air chamber at the moment, and the volume of the gas at the moment is V_{Electric power}+V_{Pot for storing food}，V_{Pot for storing food}The volume of the gas tank is known, the current time is recorded by a temperature sensorTemperature T2, current pressure P2 recorded by pressure sensor;

m can be obtained₁ = [P₂(V_{Electric power}+V_{Pot for storing food}) / RT₂]M (two);

from equation (one) and equation (two), m can be solved₁And V_{Electric power}I.e. the mass of sulfur hexafluoride gas in the electrical equipment before recovery and the effective volume V of the air chamber of the electrical equipment_{Electric power}Two variables may be evaluated.

(4) The PLC controller opens the second electromagnetic valve and opens, start the recovery unit body and carry out gas recovery, gas in the electrical equipment air chamber and the gas tank can be retrieved to storage tank or steel bottle in the recovery unit through recovery unit after beginning to retrieve, surplus gas will be less and less in the electrical equipment air chamber, atmospheric pressure is lower and lower, when retrieving the completion, the PLC controller control recovery unit body is closed, and close the second electromagnetic valve simultaneously, measure current temperature T3 through temperature sensor and pressure sensor respectively this moment, pressure P3, can draw the gaseous mass m of remaining sulfur hexafluoride in electrical equipment air chamber and the gas tank after retrieving this moment₃：

m₃ = [P₃(V_{Electric power}+V_{Pot for storing food}) / RT₃]· M

Thus recovered sulfur hexafluoride gas mass m₂= mass m of sulfur hexafluoride gas before recovery₁Mass m of sulfur hexafluoride gas remaining in the gas chamber of the electrical apparatus₃；

(5) The PLC calculates the sulfur hexafluoride gas recovery rate = the mass m of the recovered sulfur hexafluoride gas₂Mass m of sulfur hexafluoride gas in gas chamber of electrical equipment before recovery₁。

Adopt above-mentioned technical scheme, the inside volume of first pipeline, second pipeline, third pipeline, first solenoid valve and gas jar is the known quantity, because first pipeline, second pipeline, third pipeline and first solenoid valve internal volume are less than electrical equipment air chamber volume and gas jar volume far away, consequently can neglect when measuring. The PLC controller can be given in the temperature data of temperature sensor measurement, and the PLC controller can be given in the pressure data of pressure sensor measurement, and the PLC controller can control opening and stopping of recovery unit body, and the opening and closing of first solenoid valve and second solenoid valve can be controlled to the PLC controller.

The technical scheme of the invention is that a PLC (programmable logic controller), a five-way pipe joint, a gas tank, a temperature sensor, a pressure sensor, a first electromagnetic valve, a second electromagnetic valve and the like are additionally arranged on the basis of the traditional sulfur hexafluoride gas recovery device, so that the measurement of the recovery rate of sulfur hexafluoride gas can be realized, the problem that key indexes of the recovery rate of sulfur hexafluoride gas recovery operation cannot be obtained in the past is solved, and the sulfur hexafluoride gas recovery device has the advantages of scientific principle, convenience in operation and high accuracy of recovery rate test data.

Drawings

Fig. 1 is a schematic structural view of the present invention.

Detailed Description

As shown in figure 1, the sulfur hexafluoride gas recovery device comprises a recovery device body 1, a PLC (programmable logic controller) 2, a five-way pipe joint 3, a gas tank 4, a temperature sensor 5, a pressure sensor 6, a first electromagnetic valve 7 and a second electromagnetic valve 8, wherein a first interface of the five-way pipe joint 3 is connected with a first pipeline 10 used for connecting a gas chamber joint of electrical equipment 9, a second interface of the five-way pipe joint 3 is connected with a recovery port of the recovery device body 1 through a second pipeline 11, a third interface of the five-way pipe joint 3 is connected with the gas tank 4 through a third pipeline 12, the temperature sensor 5 and the pressure sensor 6 are respectively installed on the third interface and the fourth interface of the five-way pipe joint 3, the first electromagnetic valve 7 is installed on the third pipeline 12, the second electromagnetic valve 8 is installed on the fourth pipeline, the PLC 2 is respectively connected with the temperature sensor 5, the temperature sensor 5 and the second electromagnetic valve 8 through, The pressure sensor 6, the first solenoid valve 7 and the second solenoid valve 8 are connected.

Inside the shell of recovery unit body 1 was all installed to PLC controller 2, five-way pipe joint 3, gas pitcher 4, temperature sensor 5, pressure sensor 6, first solenoid valve 7 and second solenoid valve 8.

The first interface of five-way pipe joint 3 exposes the shell of recovery unit body 1, and the both ends of first pipeline 10 all are equipped with quick-operation joint.

A method for measuring the recovery rate of a sulfur hexafluoride gas recovery device comprises the following steps:

(1) connecting quick joints at two ends of a first pipeline 10 with a first interface of the five-way pipe joint 3 and an air chamber joint of the electrical equipment 9 respectively;

(2) closing the first electromagnetic valve 7 and the second electromagnetic valve 8, opening the valve of the air chamber of the electrical equipment 9, and measuring the temperature T by the temperature sensor 5 at the moment₁=293.15K, pressure P is measured by pressure sensor 6₁=0.5MPa, and the mass m of gas in the gas chamber before recovery can be calculated according to the ideal gas state equation at the moment₁：

According to the equation PV = M/M.RT, wherein M is the molar mass of sulfur hexafluoride gas 146.05g/mol, and R = 8.314J/mol.k is a constant;

m can be obtained₁ = (P₁V_{Electric power} / RT₁) M (one);

V_{electric power}The effective volume of the air chamber of the electrical equipment 9;

(3) the PLC controller 2 opens the first electromagnetic valve 7, the air chamber of the electrical equipment 9 is communicated with the air tank 4 at the moment, sulfur hexafluoride gas can flow into the air tank 4 from the air chamber of the electrical equipment 9 at the moment, and the volume of the gas is V_{Electric power}+V_{Pot for storing food}，V_{Pot for storing food}For a known volume of the gas tank 4, the current temperature T is now registered by means of the temperature sensor 5₂=292.0K, the current pressure P is recorded by the pressure sensor 6₂=0.48MPa；

M can be obtained₁ = [P₂(V_{Electric power}+V_{Pot for storing food}) / RT₂]M (two);

substituting known values according to the equation (one) and the equation (two),

m₁ = (0.5 * V_{electric power} / R * 293.15）· 146.05

m₁ = [0.48 * (V_{Electric power}+ 8L) / R * 292]· 146.05

Can calculate m₁=6.378kg，V_{Electric power}=212.877L, namely the mass of sulfur hexafluoride gas in electrical equipment 9 before recovery and the effective volume V of air chamber of electrical equipment 9_{Electric power}Two variables.

(4) The PLC controller 2 opens the second electromagnetic valve8 is opened, start recovery unit body 1 and carry out gas recovery, the gas in 9 air chambers of electrical equipment and the gas pitcher 4 can be retrieved to storage tank or steel bottle in the recovery unit through recovery unit after beginning to retrieve, surplus gas will be less and less in the 9 air chambers of electrical equipment, atmospheric pressure is lower and lower, when retrieving and finishing, PLC controller 2 control recovery unit body 1 closes, and close second solenoid valve 8 simultaneously, measure current temperature T3=286.2K respectively through temperature sensor 5 and pressure sensor 6 this moment, pressure P3= 0.0058MPa, can draw the gaseous quality m of remaining sulfur hexafluoride in 9 air chambers of electrical equipment and the gas pitcher 4 after retrieving this moment, this moment₃：

m₃ = [P₃(V_{Electric power}+V_{Pot for storing food}) / RT₃]· M

Substituting into a known value, m₃ = [0.0058 * (212.877 + 8) / R * 286.2]· 146.05

Calculated m₃=0.079kg

Thus recovered sulfur hexafluoride gas mass m₂= mass m of sulfur hexafluoride gas before recovery₁Mass m of sulfur hexafluoride gas remaining in the gas chamber of the electrical apparatus 9₃；m₂= 6.378-0.079, calculated as m₂=6.299kg。

(5) The PLC 2 calculates the sulfur hexafluoride gas recovery rate = the mass m of the recovered sulfur hexafluoride gas₂Mass m of sulfur hexafluoride gas in gas chamber of electrical equipment 9 before recovery₁(ii) a Recovery = 6.299kg/6.378kg = 98.76%.

Although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: modifications and equivalents may be made thereto without departing from the spirit and scope of the invention and it is intended to cover in the claims the invention as defined in the appended claims.