CN103616274A - Pretreatment device and pretreatment method for transformer oil - Google Patents
Pretreatment device and pretreatment method for transformer oil Download PDFInfo
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- CN103616274A CN103616274A CN201310626712.XA CN201310626712A CN103616274A CN 103616274 A CN103616274 A CN 103616274A CN 201310626712 A CN201310626712 A CN 201310626712A CN 103616274 A CN103616274 A CN 103616274A
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Abstract
The invention provides a pretreatment device and a pretreatment method for transformer oil. The pretreatment device comprises an electromagnetic valve, a ball valve, an oil tank, an oil cylinder, a circulating pump, a vacuum pump, an oil-gas separation chamber, a pressure sensor, a stepping motor, an air and nitrogen interface, an oil inlet and an oil outlet, wherein the oil inlet is connected with the oil tank, the oil cylinder and the circulating pump through four-way pieces, the oil cylinder is respectively connected with the oil tank, the oil-gas separation chamber and the pressure sensor, the ball valve is arranged between the oil tank and the oil cylinder, a piston of the oil cylinder is fixedly connected with the stepping motor through a mechanical device, the bottom of the piston is connected with the oil outlet, and the oil-gas separation chamber is connected with the air and nitrogen interface, and connected with the vacuum pump through the electromagnetic valve. According to the pretreatment device and the pretreatment method, the transformer oil is pretreated by introducing three degassing methods such as vacuum atomization degassing, air cleaning and nitrogen cleaning, so that the deficiency of cleaning and degassing effects of various methods can be made up, and residual gases dissolved in original transformer oil can be eluted efficiently.
Description
Technical field
The present invention relates to a kind of pretreatment unit and method, be specifically related to a kind of pretreatment unit and method of transformer oil.
Background technology
The mensuration of Gases Dissolved in Transformer Oil component concentration, is one of very important test item of electric system, is the effective means of judgment device latency fault in transformer factory inspection and operational process.Oil chromatography on-line monitoring equipment, as the instrument of Real-Time Monitoring Gases Dissolved in Transformer Oil component concentration, is widely used in China, and the quality of its measurement result directly affects the safe operation of transformer.At present, electric system is used standard oil sample that oil chromatography on-line monitoring equipment is calibrated, examined and determine and detects conventionally.Standard oil sample forms initial samples being carried out on pretreated basis configuration, therefore, initial samples is carried out pre-service in calibration, calibrating and is a very important flow process in detecting test.Current preprocessing process is mainly to utilize nitrogen to stir bubbling purge to initial samples, inefficiency not only, and often need to consume a large amount of nitrogen, cause very large waste.
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art, the invention provides a kind of pretreatment unit and method of transformer oil, utilize that this device can carry out that atomization final vacuum is degassed to transformer oil, air cleaning and nitrogen purge, the blank oil sample of automatic acquisition transformer oil, thereby the required standard oil sample of preparation calibration oil chromatography on-Line Monitor Device.
In order to realize foregoing invention object, the present invention takes following technical scheme:
The invention provides a kind of pretreatment unit of transformer oil, described device comprises solenoid valve, ball valve, fuel tank, oil cylinder, ebullator, vacuum pump, gas-oil separation chamber, pressure transducer, stepper motor, air and nitrogen interface, oil-in and oil-out; Between described oil-in and described fuel tank, oil cylinder and ebullator, by four-way, be connected; Described oil cylinder is connected respectively with pressure transducer with described fuel tank, gas-oil separation chamber, and described ball valve is located between described fuel tank and described oil cylinder; The piston of described oil cylinder is fixedly connected with described stepper motor by mechanical hook-up, and described piston base connects described oil-out; Described gas-oil separation chamber connects described air and nitrogen interface, and connects described vacuum pump by described solenoid valve.
Described top of oil-tank and bottom are respectively equipped with opening, and the opening at top communicates with outside air, and described fuel tank is by the opening connecting tee A of bottom.
Described oil-in is connected with one end of described four-way by solenoid valve, the other end of described four-way connects ebullator by described solenoid valve, two ends connect described fuel tank and oil cylinder by threeway A, threeway B respectively in addition, the other end of described threeway A connects ball valve by solenoid valve, and the other end of described ball valve connects described oil cylinder by threeway B.
Described oil cylinder top and bottom are respectively equipped with opening, and the opening part of top and bottom is respectively equipped with latten(-tin) and piston, and described oil cylinder connects described threeway B by described latten(-tin).
The diameter of described latten(-tin) is 50～70mm, and 10～100 circular holes are evenly set, and the diameter of described circular hole is 0.3mm～0.5mm.
Described oil-out is connected with one end of threeway C by solenoid valve, and the other two ends of described threeway C connect respectively the piston of described ebullator and described oil cylinder; Described piston adopts hollow setting.
Described oil cylinder side top side is provided with opening, described opening connecting tee D, the other two ends of described threeway D are Bonding pressure sensor and gas-oil separation chamber respectively, between described threeway D and gas-oil separation chamber, be provided with solenoid valve, described gas-oil separation chamber connects described air and nitrogen interface by threeway E, and all the other one end of described threeway E connect vacuum pump by solenoid valve; Between described threeway E and air and nitrogen interface, be provided with solenoid valve.
The indoor liquid level sensor that is provided with of described gas-oil separation.
The present invention also provides a kind of pretreatment unit of transformer oil that utilizes to carry out pretreated method to transformer oil, said method comprising the steps of:
Step 1: oil-feed;
Described descent of piston, open the solenoid valve between described four-way and threeway A, if described gas-oil separation is indoor, there is transformer oil, open solenoid valve between described threeway D and described gas-oil separation chamber and the solenoid valve between described threeway E and air and nitrogen interface, behind described piston arrives oil cylinder bottom, close the above-mentioned solenoid valve of opening;
Described descent of piston, open the solenoid valve between described four-way and threeway A, described piston arrives oil cylinder is closed the solenoid valve between described four-way and threeway A behind bottom, and opens solenoid valve between threeway D and described gas-oil separation chamber and the solenoid valve between described threeway E and vacuum pump; After reaching vacuum state in oil cylinder, close solenoid valve and the vacuum pump between the solenoid valve between threeway D and described gas-oil separation chamber, described threeway E and vacuum pump, open the solenoid valve between described oil-in and four-way, make transformer oil enter described device, after completing, close the solenoid valve between described oil-in and four-way;
Step 2: vacuum atomizing is degassed;
Open the solenoid valve between described four-way and threeway A, described upstroke, to oil cylinder top, is closed the solenoid valve between four-way and threeway A; Descent of piston, to oil cylinder bottom, is opened the solenoid valve between ball valve and ball valve and threeway A;
Step 3: when pressure is not less than 5kPa in described oil cylinder, close the solenoid valve between ball valve and ball valve and threeway A, open solenoid valve and vacuum pump between solenoid valve, threeway E and the vacuum pump between threeway D and described gas-oil separation chamber; When pressure is not higher than 0.1kPa in oil cylinder, close the above-mentioned solenoid valve of opening and vacuum pump, open the solenoid valve between ball valve and threeway A;
Step 4: the operation of circulation step 3 is until the interior transless oil of fuel tank, close the solenoid valve between ball valve and threeway A, open solenoid valve and vacuum pump between solenoid valve, threeway E and the vacuum pump between threeway D and described gas-oil separation chamber, in oil cylinder, reach after vacuum state, close the above-mentioned solenoid valve of opening and vacuum pump;
Step 5: air cleaning;
Open the solenoid valve between solenoid valve and threeway E and gas-oil separation chamber between described air and nitrogen interface and threeway E, make air access to plant, in oil cylinder, pressure reaches 95kPa and when above, close the above-mentioned solenoid valve of opening, upstroke until oil cylinder in pressure reach 150kPa and more than, open solenoid valve and ebullator between described four-way and ebullator, make transformer oil start circulation, after 15～30 minutes, close ebullator;
Step 6: nitrogen purge;
Open solenoid valve between threeway D and described gas-oil separation chamber and the solenoid valve between described air and nitrogen interface and threeway E, make nitrogen access to plant, in oil cylinder, pressure reaches 150kPa and when above, close the above-mentioned solenoid valve of opening, and open ebullator make transformer oil start circulation, after 15～30 minutes, close ebullator; Complete the pre-service of transformer oil.
Compared with prior art, beneficial effect of the present invention is:
1, by introducing, vacuum atomizing is degassed, air cleaning, three kinds of degas methods of nitrogen purge carry out pre-service to transformer oil, can make up the deficiency of the cleaning degasifying effect of the whole bag of tricks, the residual gas dissolving in the original transformer oil of more efficient wash-out;
2, used the mode that vacuum atomizing is degassed, air cleaning coordinates nitrogen purge, the use amount of effectively having saved nitrogen, has reduced experimentation cost;
3, can be easily carry out integratedly with standard oil sample manufacturing device, can prepare more quickly test standard oil sample;
4, degassed, the air cleaning of vacuum atomizing and three flow processs of nitrogen purge can repeatedly be carried out depending on Gas in Oil of Transformer concentration situation, flexible;
Whether 5, the liquid level sensor by the indoor setting of gas-oil separation judges that gas-oil separation is indoor a transformer oil;
6, the ball valve arranging between threeway A and oil cylinder can regulate the flow velocity of transformer oil to guarantee fogging degree;
7, air and nitrogen interface can be entered as air or nitrogen on demand automatically.
Accompanying drawing explanation
Fig. 1 is the pretreatment unit structural drawing of transformer oil;
Wherein, solenoid valve between 1-oil-out and threeway C, solenoid valve between 2-four-way and ebullator, solenoid valve between 3-oil-in and four-way, solenoid valve between 4-threeway A and four-way, solenoid valve between 5-threeway A and ball valve, solenoid valve between 6-threeway D and gas-oil separation chamber, solenoid valve between 7-air and nitrogen interface and threeway E, solenoid valve between 8-threeway E and vacuum pump, 9-fuel tank, 10-oil cylinder, 11-ebullator, 12-vacuum pump, 13-gas-oil separation chamber, 14-pressure transducer, 15-ball valve, 16-stepper motor, 17-threeway A, 18-threeway B, 19-threeway C, 20-threeway D, 21-threeway E, 22-four-way.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail.
As Fig. 1, the invention provides a kind of pretreatment unit of transformer oil, described device comprises solenoid valve, ball valve 15, fuel tank 9, oil cylinder 10, ebullator 11, vacuum pump 12, gas-oil separation chamber 13, pressure transducer 14, stepper motor 16, air and nitrogen interface, oil-in and oil-out; Between described oil-in and described fuel tank 9, oil cylinder 10 and ebullator 11, by four-way 22, be connected; Described oil cylinder 10 is connected respectively with described fuel tank 9, gas-oil separation chamber 13 and pressure transducer 14, and described ball valve 15 is located between described fuel tank 9 and described oil cylinder 10; The piston of described oil cylinder 10 is fixedly connected with described stepper motor 16 by mechanical hook-up, and described piston base connects described oil-out; Described gas-oil separation chamber 13 connects described air and nitrogen interface, and connects described vacuum pump 12 by described solenoid valve.
Described fuel tank 9 tops and bottom are respectively equipped with opening, and the opening at top communicates with outside air, and described fuel tank 9 is by the opening connecting tee A17 of bottom.
Described oil-in is connected with one end of described four-way 22 by solenoid valve 3, the other end of described four-way 22 connects ebullator 11 by described solenoid valve 2, two ends connect described fuel tank 9 and oil cylinder 10 by threeway A17, threeway B18 respectively in addition, the other end of described threeway A17 connects ball valve 15 by solenoid valve 5, and the other end of described ball valve 15 connects described oil cylinder 10 by threeway B18.
Described oil cylinder 10 tops and bottom are respectively equipped with opening, and the opening part of top and bottom is respectively equipped with latten(-tin) and piston, and described oil cylinder 10 connects described threeway B18 by described latten(-tin).
The diameter of described latten(-tin) is 60mm, and 80 circular holes are evenly set, and the diameter of described circular hole is 0.4mm.
Described oil-out is connected with one end of threeway C19 by solenoid valve 1, and the other two ends of described threeway C19 connect respectively the piston of described ebullator 11 and described oil cylinder 10; Described piston adopts hollow setting.
Described oil cylinder 10 side top sides are provided with opening, described opening connecting tee D20, the other two ends of described threeway D20 are Bonding pressure sensor 14 and gas-oil separation chamber 13 respectively, between described threeway D20 and gas-oil separation chamber 13, be provided with solenoid valve 6, described gas-oil separation chamber 13 connects described air and nitrogen interface by threeway E21, and all the other one end of described threeway E21 connect vacuum pump 12 by solenoid valve; Between described threeway E21 and air and nitrogen interface, be provided with solenoid valve 7.
In described gas-oil separation chamber 13, be provided with liquid level sensor.
The present invention also provides a kind of pretreatment unit of transformer oil that utilizes to carry out pretreated method to transformer oil, said method comprising the steps of:
Step 1: oil-feed;
Described descent of piston, open the solenoid valve 4 between described four-way 22 and threeway A17, if have transformer oil in described gas-oil separation chamber 13, open solenoid valve 6 between described threeway D20 and described gas-oil separation chamber 13 and the solenoid valve 7 between described threeway E21 and air and nitrogen interface, behind described piston arrives oil cylinder 10 bottoms, close the above-mentioned solenoid valve of opening 6 and solenoid valve 7;
Described descent of piston, open the solenoid valve 4 between described four-way 22 and threeway A17, described piston arrives oil cylinder is closed the solenoid valve 4 between described four-way 22 and threeway A17 behind 10 bottoms, and opens solenoid valve 6 between threeway D20 and described gas-oil separation chamber 13 and the solenoid valve 8 between described threeway E and vacuum pump 12; After reaching vacuum state in oil cylinder 10, close solenoid valve 8 and the vacuum pump 12 between the solenoid valve 6 between threeway D20 and described gas-oil separation chamber 13, described threeway E21 and vacuum pump 12, open the solenoid valve 3 between described oil-in and four-way 22, make transformer oil enter described device, after completing, close the solenoid valve 3 between described oil-in and four-way 22;
Step 2: vacuum atomizing is degassed;
Open the solenoid valve 4 between described four-way 22 and threeway A17, described upstroke, to oil cylinder 10 tops, is closed the solenoid valve 4 between four-way 22 and threeway A17; Descent of piston, to oil cylinder 10 bottoms, is opened the solenoid valve 5 between ball valve 15 and ball valve 15 and threeway A17;
Step 3: when the interior pressure of described oil cylinder 10 is not less than 5kPa, close the solenoid valve 5 between ball valve 15 and ball valve 15 and threeway A17, open solenoid valve 8 and vacuum pump 12 between solenoid valve 6, threeway E21 and the vacuum pump 12 between threeway D20 and described gas-oil separation chamber 13; When the interior pressure of oil cylinder 10 is not during higher than 0.1kPa, close the above-mentioned solenoid valve of opening 6, solenoid valve 8 and vacuum pump 12, open the solenoid valve 5 between ball valve 15 and threeway A17;
Step 4: the operation of circulation step 3 is until the interior transless oil of fuel tank 9, close the solenoid valve between ball valve 15 and threeway A17, open solenoid valve and vacuum pump 12 between solenoid valve, threeway E21 and the vacuum pump 12 between threeway D20 and described gas-oil separation chamber 13, in oil cylinder 10, reach after vacuum state, close the above-mentioned solenoid valve of opening and vacuum pump 12;
Step 5: air cleaning;
Open the solenoid valve 6 between solenoid valve 7 and threeway E21 and gas-oil separation chamber 13 between described air and nitrogen interface and threeway E21, make air access to plant, when the interior pressure of oil cylinder 10 reaches 95kPa and when above, close the above-mentioned solenoid valve of opening 7 and solenoid valve 6, upstroke until the interior pressure of oil cylinder 10 reach 150kPa and more than, open solenoid valve 2 and ebullator 11 between described four-way 22 and ebullator 11, make transformer oil start circulation, after 20 minutes, close ebullator 11;
Step 6: nitrogen purge;
Open solenoid valve 6 between threeway D20 and described gas-oil separation chamber 13 and the solenoid valve 7 between described air and nitrogen interface and threeway E21, make nitrogen access to plant, when the interior pressure of oil cylinder 10 reaches 150kPa and when above, close the above-mentioned solenoid valve of opening 6 and solenoid valve 7, and open ebullator 11 make transformer oil start circulation, after 20 minutes, close ebullator 11; Complete the pre-service of transformer oil.
Finally should be noted that: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit, although the present invention is had been described in detail with reference to above-described embodiment, those of ordinary skill in the field are to be understood that: still can modify or be equal to replacement the specific embodiment of the present invention, and do not depart from any modification of spirit and scope of the invention or be equal to replacement, it all should be encompassed in the middle of claim scope of the present invention.
Claims (9)
1. a pretreatment unit for transformer oil, is characterized in that: described device comprises solenoid valve, ball valve, fuel tank, oil cylinder, ebullator, vacuum pump, gas-oil separation chamber, pressure transducer, stepper motor, air and nitrogen interface, oil-in and oil-out; Between described oil-in and described fuel tank, oil cylinder and ebullator, by four-way, be connected; Described oil cylinder is connected respectively with pressure transducer with described fuel tank, gas-oil separation chamber, and described ball valve is located between described fuel tank and described oil cylinder; The piston of described oil cylinder is fixedly connected with described stepper motor by mechanical hook-up, and described piston base connects described oil-out; Described gas-oil separation chamber connects described air and nitrogen interface, and connects described vacuum pump by described solenoid valve.
2. the pretreatment unit of transformer oil according to claim 1, is characterized in that: described top of oil-tank and bottom are respectively equipped with opening, and the opening at top communicates with outside air, and described fuel tank is by the opening connecting tee A of bottom.
3. the pretreatment unit of transformer oil according to claim 2, it is characterized in that: described oil-in is connected with one end of described four-way by solenoid valve, the other end of described four-way connects ebullator by described solenoid valve, two ends connect described fuel tank and oil cylinder by threeway A, threeway B respectively in addition, the other end of described threeway A connects ball valve by solenoid valve, and the other end of described ball valve connects described oil cylinder by threeway B.
4. the pretreatment unit of transformer oil according to claim 3, it is characterized in that: described oil cylinder top and bottom are respectively equipped with opening, the opening part of top and bottom is respectively equipped with latten(-tin) and piston, and described oil cylinder connects described threeway B by described latten(-tin).
5. the pretreatment unit of transformer oil according to claim 4, is characterized in that: the diameter of described latten(-tin) is 50～70mm, and 10～100 circular holes are evenly set, and the diameter of described circular hole is 0.3mm～0.5mm.
6. the pretreatment unit of transformer oil according to claim 1, is characterized in that: described oil-out is connected with one end of threeway C by solenoid valve, and the other two ends of described threeway C connect respectively the piston of described ebullator and described oil cylinder; Described piston adopts hollow setting.
7. the pretreatment unit of transformer oil according to claim 4, it is characterized in that: described oil cylinder side top side is provided with opening, described opening connecting tee D, the other two ends of described threeway D are Bonding pressure sensor and gas-oil separation chamber respectively, between described threeway D and gas-oil separation chamber, be provided with solenoid valve, described gas-oil separation chamber connects described air and nitrogen interface by threeway E, and all the other one end of described threeway E connect vacuum pump by solenoid valve; Between described threeway E and air and nitrogen interface, be provided with solenoid valve.
8. the pretreatment unit of transformer oil according to claim 1, is characterized in that: the indoor liquid level sensor that is provided with of described gas-oil separation.
9. utilize the pretreatment unit of the arbitrary described transformer oil of claim 1-8 to carry out a pretreated method to transformer oil, it is characterized in that: said method comprising the steps of:
Step 1: oil-feed;
Described descent of piston, open the solenoid valve between described four-way and threeway A, if described gas-oil separation is indoor, there is transformer oil, open solenoid valve between described threeway D and described gas-oil separation chamber and the solenoid valve between described threeway E and air and nitrogen interface, behind described piston arrives oil cylinder bottom, close the above-mentioned solenoid valve of opening;
Described descent of piston, open the solenoid valve between described four-way and threeway A, described piston arrives oil cylinder is closed the solenoid valve between described four-way and threeway A behind bottom, and opens solenoid valve between threeway D and described gas-oil separation chamber and the solenoid valve between described threeway E and vacuum pump; After reaching vacuum state in oil cylinder, close solenoid valve and the vacuum pump between the solenoid valve between threeway D and described gas-oil separation chamber, described threeway E and vacuum pump, open the solenoid valve between described oil-in and four-way, make transformer oil enter described device, after completing, close the solenoid valve between described oil-in and four-way;
Step 2: vacuum atomizing is degassed;
Open the solenoid valve between described four-way and threeway A, described upstroke, to oil cylinder top, is closed the solenoid valve between four-way and threeway A; Descent of piston, to oil cylinder bottom, is opened the solenoid valve between ball valve and ball valve and threeway A;
Step 3: when pressure is not less than 5kPa in described oil cylinder, close the solenoid valve between ball valve and ball valve and threeway A, open solenoid valve and vacuum pump between solenoid valve, threeway E and the vacuum pump between threeway D and described gas-oil separation chamber; When pressure is not higher than 0.1kPa in oil cylinder, close the above-mentioned solenoid valve of opening and vacuum pump, open the solenoid valve between ball valve and threeway A;
Step 4: the operation of circulation step 3 is until the interior transless oil of fuel tank, close the solenoid valve between ball valve and threeway A, open solenoid valve and vacuum pump between solenoid valve, threeway E and the vacuum pump between threeway D and described gas-oil separation chamber, in oil cylinder, reach after vacuum state, close the above-mentioned solenoid valve of opening and vacuum pump;
Step 5: air cleaning;
Open the solenoid valve between solenoid valve and threeway E and gas-oil separation chamber between described air and nitrogen interface and threeway E, make air access to plant, in oil cylinder, pressure reaches 95kPa and when above, close the above-mentioned solenoid valve of opening, upstroke until oil cylinder in pressure reach 150kPa and more than, open solenoid valve and ebullator between described four-way and ebullator, make transformer oil start circulation, after 15～30 minutes, close ebullator;
Step 6: nitrogen purge;
Open solenoid valve between threeway D and described gas-oil separation chamber and the solenoid valve between described air and nitrogen interface and threeway E, make nitrogen access to plant, in oil cylinder, pressure reaches 150kPa and when above, close the above-mentioned solenoid valve of opening, and open ebullator make transformer oil start circulation, after 15～30 minutes, close ebullator; Complete the pre-service of transformer oil.
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| CN104215495A (en) * | 2014-10-09 | 2014-12-17 | 长沙业嘉电子科技有限公司 | Corrugated pipe vacuum degassing device and method for dissolved gas in insulating oil |
| CN104236986A (en) * | 2014-09-22 | 2014-12-24 | 杭州申昊科技股份有限公司 | Transformer oil gassing device |
| CN104569219A (en) * | 2015-01-06 | 2015-04-29 | 陈静 | Online variable-capacity vacuum full-automatic degasser for transformer oil |
| CN104849129A (en) * | 2015-05-30 | 2015-08-19 | 国家电网公司 | Transformer oil mother liquor dilution method and transformer oil mother liquor sample preparing device |
| CN106178608A (en) * | 2016-08-27 | 2016-12-07 | 南瑞通用电气智能监测诊断（武汉）有限公司 | Dynamic headspace degasser |
| CN107085088A (en) * | 2017-03-31 | 2017-08-22 | 国家电网公司 | The check system and method for calibration of Gases Dissolved in Transformer Oil on-Line Monitor Device |
| CN111790279A (en) * | 2020-06-05 | 2020-10-20 | 广西电网有限责任公司电力科学研究院 | Device for removing and dissolving gas in oil |
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| CN106178608A (en) * | 2016-08-27 | 2016-12-07 | 南瑞通用电气智能监测诊断（武汉）有限公司 | Dynamic headspace degasser |
| CN106178608B (en) * | 2016-08-27 | 2018-08-07 | 南瑞通用电气智能监测诊断（武汉）有限公司 | Dynamic headspace degasser |
| CN107085088A (en) * | 2017-03-31 | 2017-08-22 | 国家电网公司 | The check system and method for calibration of Gases Dissolved in Transformer Oil on-Line Monitor Device |
| CN107085088B (en) * | 2017-03-31 | 2019-07-26 | 国家电网公司 | The method of calibration of Gases Dissolved in Transformer Oil on-Line Monitor Device |
| CN111790279A (en) * | 2020-06-05 | 2020-10-20 | 广西电网有限责任公司电力科学研究院 | Device for removing and dissolving gas in oil |
| CN112198257A (en) * | 2020-10-05 | 2021-01-08 | 国网辽宁省电力有限公司电力科学研究院 | Automatic detection system and method for combustible gas of gas relay |
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