阅读说明：本技术 一种六氟化硫气体酸度检测装置 (Sulfur hexafluoride gas acidity detection device ) 是由 付丽君 关艳玲 张亮 张航 王晗 迟敬元 郭蕴 陈世玉 卫兵 王鲁昕 于 2021-09-29 设计创作，主要内容包括：一种六氟化硫气体酸度检测装置,涉及一种六氟化硫气体酸度检测装置。本发明是要解决现有的六氟化硫气体酸度测定法为纯手工滴定方法,相对误差偏大,操作较繁琐的技术问题。本发明在进气口和出气口处设计了微量流量传感器、压力传感器和温度传感器可实时监测吸收阶段通入的六氟化硫气体的流量、压力和温度；本发明在滴定阶段采用了自动电位滴定仪,可准确判断滴定终点；本发明的吸收阶段、滴定阶段的每一个步骤均可通过计算机在设置好相应程序的软件中实施观察、并将涉及到的数据显示并保存记录。本发明可有效检测六氟化硫气体中的酸度含量,简化操作步骤,提高检测精度,方便、快捷、高效。(A sulfur hexafluoride gas acidity detection device relates to a sulfur hexafluoride gas acidity detection device. The invention aims to solve the technical problems that the existing method for measuring the acidity of sulfur hexafluoride gas is a pure manual titration method, has large relative error and is complicated to operate. The invention designs a micro flow sensor, a pressure sensor and a temperature sensor at the gas inlet and the gas outlet, which can monitor the flow, the pressure and the temperature of sulfur hexafluoride gas introduced in the absorption stage in real time; the invention adopts an automatic potentiometric titrator in the titration stage, and can accurately judge the titration end point; each step of the absorption stage and the titration stage of the invention can be observed in software with a corresponding program through a computer, and related data is displayed and recorded. The method can effectively detect the acidity content in the sulfur hexafluoride gas, simplify the operation steps, improve the detection precision, and is convenient, rapid and efficient.)

1. The sulfur hexafluoride gas acidity detection device is characterized by comprising a first absorption bottle (1), a second absorption bottle (2), a third absorption bottle (3), a first pressure sensor (4), a first temperature sensor (5), a first micro flow sensor (6), an air inlet pipe (7), a sand core type absorption pipe (8), 3 magnetic stirrers (9), 3 stirrers (10), a second temperature sensor (13), three first electromagnetic valves (14), a sodium hydroxide solution storage bottle (15), a first peristaltic pump (16), a first absorption pipe (17), a second absorption pipe (18), a gas collection device (19), a second pressure sensor (20), a third temperature sensor (21), a second micro flow sensor (22), a fourth temperature sensor (25), a fifth temperature sensor (28), The device comprises a gas cylinder (29), a second electromagnetic valve (30), a computer, a second peristaltic pump, a sulfuric acid solution storage bottle and 3 automatic potentiometric titrators; the sand core type absorption pipe (16) is made of polytetrafluoroethylene; the first absorption pipe (17) and the second absorption pipe (18) are both made of polytetrafluoroethylene;

the bottle bodies of the first absorption bottle (1), the second absorption bottle (2) and the third absorption bottle (3) are provided with scale marks, and the three absorption bottles are all of closed structures; the method comprises the following steps that sulfur hexafluoride gas to be detected is placed in a gas cylinder (29), a gas outlet of the gas cylinder (29) is communicated to the bottom of an inner cavity of a first absorption bottle (1) sequentially through a gas inlet pipe (7) and a sand core type absorption pipe (8), the sand core type absorption pipe (8) is arranged in the inner cavity of the first absorption bottle (1), the bottom (8-1) of the sand core type absorption pipe (8) is of an inverted funnel structure, the gas inlet pipe (7) is arranged outside the first absorption bottle (1), and a second electromagnetic valve (30), a first pressure sensor (4), a first temperature sensor (5) and a first micro flow sensor (6) are arranged on the gas inlet pipe (7); a magnetic stirrer (9) is arranged below each absorption bottle, and a stirrer (10) is arranged in the inner cavity of each absorption bottle; a second temperature sensor (13) is arranged in the first absorption bottle (1), a fourth temperature sensor (25) is arranged in the second absorption bottle (2), and a fifth temperature sensor (28) is arranged in the third absorption bottle (3);

the 3 automatic potentiometric titrators are respectively a first automatic potentiometric titrator, a second automatic potentiometric titrator and a third automatic potentiometric titrator and are respectively used in one-to-one correspondence with the first absorption bottle (1), the second absorption bottle (2) and the third absorption bottle (3); a first potentiometric burette (11) and a first potentiometric electrode (12) of the first automatic potentiometric titrator are arranged in the first absorption bottle (1); a second potentiometric burette (23) and a second potentiometric electrode (24) of the second automatic potentiometric titrator are arranged in the second absorption bottle (2); a third potentiometric burette (26) and a third potentiometric electrode (27) of the third automatic potentiometric titrator are arranged in a third absorption bottle (3);

the first absorption bottle (1) is communicated with the second absorption bottle (2) through a first absorption pipe (17), the second absorption bottle (2) is communicated with the third absorption bottle (3) through a second absorption pipe (18), the gas outlet of the third absorption bottle (3) is communicated with a gas collecting device (19), and a second pressure sensor (20), a third temperature sensor (21) and a second micro-flow sensor (22) are arranged on a pipeline between the gas outlet of the third absorption bottle (3) and the gas collecting device (19);

a liquid outlet of the sodium hydroxide solution storage bottle (15) is communicated with a liquid inlet of a first peristaltic pump (16), a liquid outlet of the first peristaltic pump (16) is respectively communicated with a first absorption bottle (1), a second absorption bottle (2) and a third absorption bottle (3), and three pipelines for communicating the liquid outlet of the first peristaltic pump (16) with the three absorption bottles are respectively provided with an electromagnetic valve (14);

the liquid outlet of the sulfuric acid solution storage bottle is communicated with the liquid inlet of a second peristaltic pump, and the liquid outlet of the second peristaltic pump is respectively communicated with a first potentiometric burette (11), a second potentiometric burette (23) and a third potentiometric burette (26) through three automatic potentiometric titrators;

the signal input end of the computer is respectively connected with the signal input ends of a first pressure sensor (4), a first temperature sensor (5), a first micro flow sensor (6), a second temperature sensor (13), a second pressure sensor (20), a third temperature sensor (21), a second micro flow sensor (22), a fourth temperature sensor (25) and a fifth temperature sensor (28);

the signal output end of the computer is respectively connected with the signal input ends of 3 magnetic stirrers (9), a second electromagnetic valve (30), 3 first electromagnetic valves (14), a first peristaltic pump (16), a second peristaltic pump and 3 automatic potentiometric titrators.

2. The sulfur hexafluoride gas acidity detection device according to claim 1, wherein the gas cylinder (29) is a steel cylinder.

3. The apparatus for detecting the acidity of sulfur hexafluoride gas as claimed in claim 1, wherein the gas collecting means (19) is a steel cylinder.

4. The sulfur hexafluoride gas acidity detection device of claim 1, wherein the first peristaltic pump (16) is a variable speed peristaltic pump.

5. The sulfur hexafluoride gas acidity detection device of claim 1, wherein the second peristaltic pump is a speed-adjustable peristaltic pump.

Technical Field

The invention relates to a sulfur hexafluoride gas acidity detection device.

Background

The sulfur hexafluoride gas has stable chemical property and is nontoxic, the sulfur hexafluoride new gas may bring some impurities such as moisture, air, acidic by-products and the like in the production process, when the sulfur hexafluoride gas contains the moisture and air impurities, the decomposed gas generated under the action of electric arc is toxic or extremely toxic, when the sulfur hexafluoride gas contacts with the insulating material of the equipment, the decomposed product and the substances have complex chemical reaction to generate acid and acidic substances, the metal parts and the insulating material of the equipment can be corroded, and the mechanical, conductive and insulating properties of the electrical equipment are influenced. Furthermore, the acidity of sulfur hexafluoride gas represents to some extent the magnitude of the toxicity of sulfur hexafluoride gas. Standard DL/T916-. Therefore, the acidity content in the sulfur hexafluoride gas is effectively detected, and the method is of great importance for ensuring the safety of human bodies and equipment.

Disclosure of Invention

The invention provides a device for detecting acidity of sulfur hexafluoride gas, aiming at solving the technical problems that the existing method for measuring acidity of sulfur hexafluoride gas is a pure manual titration method, has large relative error and is complicated to operate.

The invention relates to a sulfur hexafluoride gas acidity detection device, which consists of a first absorption bottle 1, a second absorption bottle 2, a third absorption bottle 3, a first pressure sensor 4, a first temperature sensor 5, a first micro-flow sensor 6, an air inlet pipe 7, a sand core type absorption pipe 8, 3 magnetic stirrers 9, 3 stirrers 10, a second temperature sensor 13, three first electromagnetic valves 14, a sodium hydroxide solution storage bottle 15, a first peristaltic pump 16, a first absorption pipe 17, a second absorption pipe 18, a gas collection device 19, a second pressure sensor 20, a third temperature sensor 21, a second micro-flow sensor 22, a fourth temperature sensor 25, a fifth temperature sensor 28, a gas bottle 29, a second electromagnetic valve 30, a computer, a second peristaltic pump, a sulfuric acid solution storage bottle and 3 automatic potentiometers; the sand core type absorption tube 16 is made of polytetrafluoroethylene; the first absorption pipe 17 and the second absorption pipe 18 are made of polytetrafluoroethylene;

the bottle bodies of the first absorption bottle 1, the second absorption bottle 2 and the third absorption bottle 3 are provided with scale marks, and the three absorption bottles are all of closed structures; the method comprises the following steps that sulfur hexafluoride gas to be detected is placed in a gas cylinder 29, a gas outlet of the gas cylinder 29 is communicated to the bottom of an inner cavity of a first absorption bottle 1 sequentially through a gas inlet pipe 7 and a sand core type absorption pipe 8, the sand core type absorption pipe 8 is arranged in the inner cavity of the first absorption bottle 1, the bottom 8-1 of the sand core type absorption pipe 8 is of an inverted funnel structure, the gas inlet pipe 7 is arranged outside the first absorption bottle 1, and a second electromagnetic valve 30, a first pressure sensor 4, a first temperature sensor 5 and a first micro flow sensor 6 are arranged on the gas inlet pipe 7; a magnetic stirrer 9 is arranged below each absorption bottle, and a stirrer 10 is arranged in the inner cavity of each absorption bottle; a second temperature sensor 13 is arranged in the first absorption bottle 1, a fourth temperature sensor 25 is arranged in the second absorption bottle 2, and a fifth temperature sensor 28 is arranged in the third absorption bottle 3;

the 3 automatic potentiometric titrators are respectively a first automatic potentiometric titrator, a second automatic potentiometric titrator and a third automatic potentiometric titrator and are respectively used in one-to-one correspondence with the first absorption bottle 1, the second absorption bottle 2 and the third absorption bottle 3; a first potentiometric burette 11 and a first potentiometric electrode 12 of the first automatic potentiometric titrator are arranged in the first absorption bottle 1; a second potentiometric burette 23 and a second potentiometric electrode 24 of the second automatic potentiometric titrator are arranged in the second absorption bottle 2; a third potentiometric burette 26 and a third potentiometric electrode 27 of the third automatic potentiometric titrator are arranged in the third absorption bottle 3;

the first absorption bottle 1 is communicated with the second absorption bottle 2 through a first absorption pipe 17, the second absorption bottle 2 is communicated with the third absorption bottle 3 through a second absorption pipe 18, the gas outlet of the third absorption bottle 3 is communicated with a gas collecting device 19, and a second pressure sensor 20, a third temperature sensor 21 and a second micro-flow sensor 22 are arranged on a pipeline between the gas outlet of the third absorption bottle 3 and the gas collecting device 19;

the liquid outlet of the sodium hydroxide solution storage bottle 15 is communicated with the liquid inlet of the first peristaltic pump 16, the liquid outlet of the first peristaltic pump 16 is respectively communicated with the first absorption bottle 1, the second absorption bottle 2 and the third absorption bottle 3, and three pipelines for communicating the liquid outlet of the first peristaltic pump 16 with the three absorption bottles are respectively provided with an electromagnetic valve 14;

the liquid outlet of the sulfuric acid solution storage bottle is communicated with the liquid inlet of a second peristaltic pump, and the liquid outlet of the second peristaltic pump is respectively communicated with a first potentiometric burette 11, a second potentiometric burette 23 and a third potentiometric burette 26 through three automatic potentiometric titrators;

the signal input end of the computer is respectively connected with the signal input ends of a first pressure sensor 4, a first temperature sensor 5, a first micro flow sensor 6, a second temperature sensor 13, a second pressure sensor 20, a third temperature sensor 21, a second micro flow sensor 22, a fourth temperature sensor 25 and a fifth temperature sensor 28;

and the signal output end of the computer is respectively connected with the signal input ends of 3 magnetic stirrers 9, a second electromagnetic valve 30, 3 first electromagnetic valves 14, a first peristaltic pump 16, a second peristaltic pump and 3 automatic potentiometric titrators.

The use method of the sulfur hexafluoride gas acidity detection device provided by the invention comprises the following steps:

firstly, a first peristaltic pump 16 and three first electromagnetic valves 14 are started by a computer to pump 0.01mol/L of sodium hydroxide solution in a sodium hydroxide solution storage bottle 15 into a first absorption bottle 1, a second absorption bottle 2 and a third absorption bottle 3 respectively, and the lower ends of a sand core type absorption tube 8, a first absorption tube 17, a second absorption tube 18, a second temperature sensor 13, a first potential electrode 12, a fourth temperature sensor 25, a second potential electrode 24, a fifth temperature sensor 28 and a third potential electrode 27 are all below the liquid level; the second electromagnetic valve 30 is started by the computer to introduce the sulfur hexafluoride gas to be detected in the gas cylinder 29 into the sodium hydroxide solution of the first absorption bottle 1 through the sand core type absorption tube 8 for absorption, and the second absorption bottle 2 and the third absorption bottle 3 can ensure that the sulfur hexafluoride gas which is not completely absorbed by the first absorption bottle 1 is absorbed; starting 3 magnetic stirrers 9 through a computer to stir the solution in the three absorption bottles to ensure that the concentration of the solution in the three absorption bottles is uniform in the titration process; the computer can control 3 automatic potentiometric titrators (not shown in the figure) to titrate 0.01mol/L sulfuric acid solution in a sulfuric acid solution storage bottle (not shown in the figure) into three absorption bottles at the same time, so that the titration is more efficient than the conventional titration performed by one reagent bottle, the automatic potentiometric titrators can automatically stop titration when the titration reaches the end point, and the titration is more accurate than an indicator visual observation method; when the titration solution in the three potentiometric burettes is insufficient, the sulfuric acid solution in the sulfuric acid solution storage bottle can be supplemented into the potentiometric burettes through a second peristaltic pump (not shown in the figure); calculating the acidity of the sulfur hexafluoride to be detected according to the volume of the titrated sulfuric acid solution in the three absorption bottles, wherein the calculation method completely adopts the calculation method in DL/T916-;

a first pressure sensor 4, a first temperature sensor 5 and a first micro flow sensor 6 are arranged in an air inlet pipe 7; the first pressure sensor 4 and the second pressure sensor 20 can monitor the pressure value of the gas flowing through the pipeline in real time and can transmit the pressure value to a computer for recording; the first temperature sensor 5 and the third temperature sensor 21 can monitor the temperature of the gas flowing through the pipeline in real time and can transmit the temperature to a computer for recording; the first micro flow sensor 6 can transmit the flow of gas in the pipeline to a computer in real time, the computer can also set quantitative flow to detect the accuracy of the first micro flow sensor 6, and the first micro flow sensor 6 and the second micro flow sensor 22 are designed to monitor whether the flow of gas entering the pipeline is consistent with the flow of gas exiting the pipeline or not so as to ensure the accuracy of accurately calculating the total volume of the gas flowing through the absorption bottle within a fixed time; the second temperature sensor 13, the fourth temperature sensor 25 and the fifth temperature sensor 28 can monitor the temperature of the solution in the three absorption bottles in real time; the gas collecting means 19 can collect the gas that has not been absorbed.

The sand core type absorption pipe 8, the first absorption pipe 17 and the second absorption pipe 18 are all made of polytetrafluoroethylene, are disposable, keep clean and guarantee the accuracy of data; the connecting pipelines are silicone tubes and can be detached and replaced; the storage bottle and the absorption bottle are made of polytetrafluoroethylene materials, and can be detached and cleaned after the test is finished.

The computer in the invention can control the whole test flow, can set the time of sulfur hexafluoride gas passing through the micro flow sensor, can display the titration result after the titration of each absorption bottle is finished, can display and record the corrected volume of the sulfur hexafluoride gas when the volume of the sulfur hexafluoride gas flowing through the computer in the set time is corrected to 20 ℃ and 101325Pa under the test initial pressure and temperature, and can also display the final acidity result value calculated according to the formula in the standard DL/T916-2005.

Drawings

Fig. 1 is a schematic diagram of a sulfur hexafluoride gas acidity detection apparatus according to a first embodiment.

Detailed Description

The first embodiment is as follows: the present embodiment is a device for detecting acidity of sulfur hexafluoride gas, as shown in fig. 1, the device specifically comprises a first absorption bottle 1, a second absorption bottle 2, a third absorption bottle 3, a first pressure sensor 4, a first temperature sensor 5, a first micro flow sensor 6, an air inlet pipe 7, a sand core type absorption pipe 8, 3 magnetic stirrers 9, 3 stirrers 10, a second temperature sensor 13, three first electromagnetic valves 14, a sodium hydroxide solution storage bottle 15, a first peristaltic pump 16, a first absorption pipe 17, a second absorption pipe 18, a gas collection device 19, a second pressure sensor 20, a third temperature sensor 21, a second micro flow sensor 22, a fourth temperature sensor 25, a fifth temperature sensor 28, a gas bottle 29, a second electromagnetic valve 30, a computer, a second peristaltic pump, a sulfuric acid solution storage bottle and 3 automatic potentiometric titrators; the sand core type absorption tube 16 is made of polytetrafluoroethylene; the first absorption pipe 17 and the second absorption pipe 18 are made of polytetrafluoroethylene;

the bottle bodies of the first absorption bottle 1, the second absorption bottle 2 and the third absorption bottle 3 are provided with scale marks, and the three absorption bottles are all of closed structures; the method comprises the following steps that sulfur hexafluoride gas to be detected is placed in a gas cylinder 29, a gas outlet of the gas cylinder 29 is communicated to the bottom of an inner cavity of a first absorption bottle 1 sequentially through a gas inlet pipe 7 and a sand core type absorption pipe 8, the sand core type absorption pipe 8 is arranged in the inner cavity of the first absorption bottle 1, the bottom 8-1 of the sand core type absorption pipe 8 is of an inverted funnel structure, the gas inlet pipe 7 is arranged outside the first absorption bottle 1, and a second electromagnetic valve 30, a first pressure sensor 4, a first temperature sensor 5 and a first micro flow sensor 6 are arranged on the gas inlet pipe 7; a magnetic stirrer 9 is arranged below each absorption bottle, and a stirrer 10 is arranged in the inner cavity of each absorption bottle; a second temperature sensor 13 is arranged in the first absorption bottle 1, a fourth temperature sensor 25 is arranged in the second absorption bottle 2, and a fifth temperature sensor 28 is arranged in the third absorption bottle 3;

the 3 automatic potentiometric titrators are respectively a first automatic potentiometric titrator, a second automatic potentiometric titrator and a third automatic potentiometric titrator and are respectively used in one-to-one correspondence with the first absorption bottle 1, the second absorption bottle 2 and the third absorption bottle 3; a first potentiometric burette 11 and a first potentiometric electrode 12 of the first automatic potentiometric titrator are arranged in the first absorption bottle 1; a second potentiometric burette 23 and a second potentiometric electrode 24 of the second automatic potentiometric titrator are arranged in the second absorption bottle 2; a third potentiometric burette 26 and a third potentiometric electrode 27 of the third automatic potentiometric titrator are arranged in the third absorption bottle 3;

the first absorption bottle 1 is communicated with the second absorption bottle 2 through a first absorption pipe 17, the second absorption bottle 2 is communicated with the third absorption bottle 3 through a second absorption pipe 18, the gas outlet of the third absorption bottle 3 is communicated with a gas collecting device 19, and a second pressure sensor 20, a third temperature sensor 21 and a second micro-flow sensor 22 are arranged on a pipeline between the gas outlet of the third absorption bottle 3 and the gas collecting device 19;

the liquid outlet of the sodium hydroxide solution storage bottle 15 is communicated with the liquid inlet of the first peristaltic pump 16, the liquid outlet of the first peristaltic pump 16 is respectively communicated with the first absorption bottle 1, the second absorption bottle 2 and the third absorption bottle 3, and three pipelines for communicating the liquid outlet of the first peristaltic pump 16 with the three absorption bottles are respectively provided with an electromagnetic valve 14;

the liquid outlet of the sulfuric acid solution storage bottle is communicated with the liquid inlet of a second peristaltic pump, and the liquid outlet of the second peristaltic pump is respectively communicated with a first potentiometric burette 11, a second potentiometric burette 23 and a third potentiometric burette 26 through three automatic potentiometric titrators;

the signal input end of the computer is respectively connected with the signal input ends of a first pressure sensor 4, a first temperature sensor 5, a first micro flow sensor 6, a second temperature sensor 13, a second pressure sensor 20, a third temperature sensor 21, a second micro flow sensor 22, a fourth temperature sensor 25 and a fifth temperature sensor 28;

and the signal output end of the computer is respectively connected with the signal input ends of 3 magnetic stirrers 9, a second electromagnetic valve 30, 3 first electromagnetic valves 14, a first peristaltic pump 16, a second peristaltic pump and 3 automatic potentiometric titrators.

The using method of the sulfur hexafluoride gas acidity detection device in the embodiment comprises the following steps:

firstly, a first peristaltic pump 16 and three first electromagnetic valves 14 are started by a computer to pump 0.01mol/L of sodium hydroxide solution in a sodium hydroxide solution storage bottle 15 into a first absorption bottle 1, a second absorption bottle 2 and a third absorption bottle 3 respectively, and the lower ends of a sand core type absorption tube 8, a first absorption tube 17, a second absorption tube 18, a second temperature sensor 13, a first potential electrode 12, a fourth temperature sensor 25, a second potential electrode 24, a fifth temperature sensor 28 and a third potential electrode 27 are all below the liquid level; the second electromagnetic valve 30 is started by the computer to introduce the sulfur hexafluoride gas to be detected in the gas cylinder 29 into the sodium hydroxide solution of the first absorption bottle 1 through the sand core type absorption tube 8 for absorption, and the second absorption bottle 2 and the third absorption bottle 3 can ensure that the sulfur hexafluoride gas which is not completely absorbed by the first absorption bottle 1 is absorbed; starting 3 magnetic stirrers 9 through a computer to stir the solution in the three absorption bottles to ensure that the concentration of the solution in the three absorption bottles is uniform in the titration process; the computer can control 3 automatic potentiometric titrators (not shown in the figure) to titrate 0.01mol/L sulfuric acid solution in a sulfuric acid solution storage bottle (not shown in the figure) into three absorption bottles at the same time, so that the titration is more efficient than the conventional titration performed by one reagent bottle, the automatic potentiometric titrators can automatically stop titration when the titration reaches the end point, and the titration is more accurate than an indicator visual observation method; when the titration solution in the three potentiometric burettes is insufficient, the sulfuric acid solution in the sulfuric acid solution storage bottle can be supplemented into the potentiometric burettes through a second peristaltic pump (not shown in the figure); calculating the acidity of the sulfur hexafluoride to be detected according to the volume of the titrated sulfuric acid solution in the three absorption bottles, wherein the calculation method completely adopts the calculation method in DL/T916-;

the first pressure sensor 4, the first temperature sensor 5, and the first micro flow sensor 6 in the present embodiment are installed in the intake pipe 7; the first pressure sensor 4 and the second pressure sensor 20 can monitor the pressure value of the gas flowing through the pipeline in real time and can transmit the pressure value to a computer for recording; the first temperature sensor 5 and the third temperature sensor 21 can monitor the temperature of the gas flowing through the pipeline in real time and can transmit the temperature to a computer for recording; the first micro flow sensor 6 can transmit the flow of gas in the pipeline to a computer in real time, the computer can also set quantitative flow to detect the accuracy of the first micro flow sensor 6, and the first micro flow sensor 6 and the second micro flow sensor 22 are designed to monitor whether the flow of gas entering the pipeline is consistent with the flow of gas exiting the pipeline or not so as to ensure the accuracy of accurately calculating the total volume of the gas flowing through the absorption bottle within a fixed time; the second temperature sensor 13, the fourth temperature sensor 25 and the fifth temperature sensor 28 can monitor the temperature of the solution in the three absorption bottles in real time; the gas collecting means 19 can collect the gas that has not been absorbed.

The sand core type absorption pipe 8, the first absorption pipe 17 and the second absorption pipe 18 are all made of polytetrafluoroethylene, are disposable, keep clean and ensure the accuracy of data; the connecting pipelines are silicone tubes and can be detached and replaced; the storage bottle and the absorption bottle are made of polytetrafluoroethylene materials, and can be detached and cleaned after the test is finished.

The computer in this embodiment may control the whole test flow, may set the time for the sulfur hexafluoride gas to pass through the micro flow sensor, may display the titration result after the titration is finished for each absorption bottle, may display and record the corrected volume of the sulfur hexafluoride gas at the initial pressure and the initial temperature of the test when the volume of the sulfur hexafluoride gas flowing through within the set time is corrected to 20 ℃ and 101325Pa, and may display the final acidity result value calculated according to the formula in the standard DL/T916-2005.

The second embodiment is as follows: the first difference between the present embodiment and the specific embodiment is: the gas cylinder 29 is a steel cylinder. The rest is the same as the first embodiment.

The third concrete implementation mode: the present embodiment differs from the first or second embodiment in that: the gas collecting device 19 is a steel cylinder. The others are the same as in the first or second embodiment.

The fourth concrete implementation mode: the difference between this embodiment mode and one of the first to third embodiment modes is: the first peristaltic pump 16 is a speed-adjustable peristaltic pump. The rest is the same as one of the first to third embodiments.

The fifth concrete implementation mode: the fourth difference between this embodiment and the specific embodiment is that: the second peristaltic pump is a speed-regulating peristaltic pump. The rest is the same as the fourth embodiment.

The invention was verified with the following tests:

test one: the test is a sulfur hexafluoride gas acidity detection device, as shown in fig. 1, and specifically comprises a first absorption bottle 1, a second absorption bottle 2, a third absorption bottle 3, a first pressure sensor 4, a first temperature sensor 5, a first micro flow sensor 6, an air inlet pipe 7, a sand core type absorption pipe 8, 3 magnetic stirrers 9, 3 stirrers 10, a second temperature sensor 13, three first electromagnetic valves 14, a sodium hydroxide solution storage bottle 15, a first peristaltic pump 16, a first absorption pipe 17, a second absorption pipe 18, a gas collection device 19, a second pressure sensor 20, a third temperature sensor 21, a second micro flow sensor 22, a fourth temperature sensor 25, a fifth temperature sensor 28, an air bottle 29, a second electromagnetic valve 30, a computer, a second peristaltic pump, a sulfuric acid solution storage bottle, and 3 automatic potentiometric titrators; the sand core type absorption tube 16 is made of polytetrafluoroethylene; the first absorption pipe 17 and the second absorption pipe 18 are made of polytetrafluoroethylene; the gas cylinder 29 is a steel cylinder; the gas collecting device 19 is a steel cylinder; the first peristaltic pump 16 is a speed-regulating peristaltic pump; the second peristaltic pump is a speed-regulating peristaltic pump;

the bottle bodies of the first absorption bottle 1, the second absorption bottle 2 and the third absorption bottle 3 are provided with scale marks, and the three absorption bottles are all of closed structures; the method comprises the following steps that sulfur hexafluoride gas to be detected is placed in a gas cylinder 29, a gas outlet of the gas cylinder 29 is communicated to the bottom of an inner cavity of a first absorption bottle 1 sequentially through a gas inlet pipe 7 and a sand core type absorption pipe 8, the sand core type absorption pipe 8 is arranged in the inner cavity of the first absorption bottle 1, the bottom 8-1 of the sand core type absorption pipe 8 is of an inverted funnel structure, the gas inlet pipe 7 is arranged outside the first absorption bottle 1, and a second electromagnetic valve 30, a first pressure sensor 4, a first temperature sensor 5 and a first micro flow sensor 6 are arranged on the gas inlet pipe 7; a magnetic stirrer 9 is arranged below each absorption bottle, and a stirrer 10 is arranged in the inner cavity of each absorption bottle; a second temperature sensor 13 is arranged in the first absorption bottle 1, a fourth temperature sensor 25 is arranged in the second absorption bottle 2, and a fifth temperature sensor 28 is arranged in the third absorption bottle 3;

the 3 automatic potentiometric titrators are respectively a first automatic potentiometric titrator, a second automatic potentiometric titrator and a third automatic potentiometric titrator and are respectively used in one-to-one correspondence with the first absorption bottle 1, the second absorption bottle 2 and the third absorption bottle 3; a first potentiometric burette 11 and a first potentiometric electrode 12 of the first automatic potentiometric titrator are arranged in the first absorption bottle 1; a second potentiometric burette 23 and a second potentiometric electrode 24 of the second automatic potentiometric titrator are arranged in the second absorption bottle 2; a third potentiometric burette 26 and a third potentiometric electrode 27 of the third automatic potentiometric titrator are arranged in the third absorption bottle 3;

the first absorption bottle 1 is communicated with the second absorption bottle 2 through a first absorption pipe 17, the second absorption bottle 2 is communicated with the third absorption bottle 3 through a second absorption pipe 18, the gas outlet of the third absorption bottle 3 is communicated with a gas collecting device 19, and a second pressure sensor 20, a third temperature sensor 21 and a second micro-flow sensor 22 are arranged on a pipeline between the gas outlet of the third absorption bottle 3 and the gas collecting device 19;

the liquid outlet of the sodium hydroxide solution storage bottle 15 is communicated with the liquid inlet of the first peristaltic pump 16, the liquid outlet of the first peristaltic pump 16 is respectively communicated with the first absorption bottle 1, the second absorption bottle 2 and the third absorption bottle 3, and three pipelines for communicating the liquid outlet of the first peristaltic pump 16 with the three absorption bottles are respectively provided with an electromagnetic valve 14;

the liquid outlet of the sulfuric acid solution storage bottle is communicated with the liquid inlet of a second peristaltic pump, and the liquid outlet of the second peristaltic pump is respectively communicated with a first potentiometric burette 11, a second potentiometric burette 23 and a third potentiometric burette 26 through three automatic potentiometric titrators;

the signal input end of the computer is respectively connected with the signal input ends of a first pressure sensor 4, a first temperature sensor 5, a first micro flow sensor 6, a second temperature sensor 13, a second pressure sensor 20, a third temperature sensor 21, a second micro flow sensor 22, a fourth temperature sensor 25 and a fifth temperature sensor 28;

and the signal output end of the computer is respectively connected with the signal input ends of 3 magnetic stirrers 9, a second electromagnetic valve 30, 3 first electromagnetic valves 14, a first peristaltic pump 16, a second peristaltic pump and 3 automatic potentiometric titrators.

The using method of the sulfur hexafluoride gas acidity detection device in the test comprises the following steps:

firstly, a first peristaltic pump 16 and three first electromagnetic valves 14 are started by a computer to pump 0.01mol/L of sodium hydroxide solution in a sodium hydroxide solution storage bottle 15 into a first absorption bottle 1, a second absorption bottle 2 and a third absorption bottle 3 respectively, and the lower ends of a sand core type absorption tube 8, a first absorption tube 17, a second absorption tube 18, a second temperature sensor 13, a first potential electrode 12, a fourth temperature sensor 25, a second potential electrode 24, a fifth temperature sensor 28 and a third potential electrode 27 are all below the liquid level; the second electromagnetic valve 30 is started by the computer to introduce the sulfur hexafluoride gas to be detected in the gas cylinder 29 into the sodium hydroxide solution of the first absorption bottle 1 through the sand core type absorption tube 8 for absorption, and the second absorption bottle 2 and the third absorption bottle 3 can ensure that the sulfur hexafluoride gas which is not completely absorbed by the first absorption bottle 1 is absorbed; starting 3 magnetic stirrers 9 through a computer to stir the solution in the three absorption bottles to ensure that the concentration of the solution in the three absorption bottles is uniform in the titration process; the computer can control 3 automatic potentiometric titrators (not shown in the figure) to titrate 0.01mol/L sulfuric acid solution in a sulfuric acid solution storage bottle (not shown in the figure) into three absorption bottles at the same time, so that the titration is more efficient than the conventional titration performed by one reagent bottle, the automatic potentiometric titrators can automatically stop titration when the titration reaches the end point, and the titration is more accurate than an indicator visual observation method; when the titration solution in the three potentiometric burettes is insufficient, the sulfuric acid solution in the sulfuric acid solution storage bottle can be supplemented into the potentiometric burettes through a second peristaltic pump (not shown in the figure); calculating the acidity of the sulfur hexafluoride to be detected according to the volume of the titrated sulfuric acid solution in the three absorption bottles, wherein the calculation method completely adopts the calculation method in DL/T916-;

in the test, a first pressure sensor 4, a first temperature sensor 5 and a first micro flow sensor 6 are arranged in an air inlet pipe 7; the first pressure sensor 4 and the second pressure sensor 20 can monitor the pressure value of the gas flowing through the pipeline in real time and can transmit the pressure value to a computer for recording; the first temperature sensor 5 and the third temperature sensor 21 can monitor the temperature of the gas flowing through the pipeline in real time and can transmit the temperature to a computer for recording; the first micro flow sensor 6 can transmit the flow of gas in the pipeline to a computer in real time, the computer can also set quantitative flow to detect the accuracy of the first micro flow sensor 6, and the first micro flow sensor 6 and the second micro flow sensor 22 are designed to monitor whether the flow of gas entering the pipeline is consistent with the flow of gas exiting the pipeline or not so as to ensure the accuracy of accurately calculating the total volume of the gas flowing through the absorption bottle within a fixed time; the second temperature sensor 13, the fourth temperature sensor 25 and the fifth temperature sensor 28 can monitor the temperature of the solution in the three absorption bottles in real time; the gas collecting means 19 can collect the gas that has not been absorbed.

The sand core type absorption tube 8, the first absorption tube 17 and the second absorption tube 18 are all made of polytetrafluoroethylene, are disposable, keep clean and guarantee the accuracy of data; the connecting pipelines are silicone tubes and can be detached and replaced; the storage bottle and the absorption bottle are made of polytetrafluoroethylene materials, and can be detached and cleaned after the test is finished.

The computer in the test can control the whole test flow, can set the time of sulfur hexafluoride gas passing through the micro flow sensor, can display the titration result after the titration of each absorption bottle is finished, can display and record the corrected volume of the sulfur hexafluoride gas flowing in the set time at the initial pressure and the initial temperature of the test when the volume of the sulfur hexafluoride gas is corrected to be 20 ℃ and 101325Pa, and can display the final acidity result value calculated according to the formula in the standard DL/T916-2005.