Emergency recovery and purification system of sulfur hexafluoride gas after leakage of transformer in underground substation

Abstract

Provided is an emergency recovery and purification system of sulfur hexafluoride gas after leakage of a transformer in an underground substation. The emergency recovery and purification system of sulfur hexafluoride gas after leakage of the transformer in the underground substation comprises an online sulfur hexafluoride leakage alarm, an automatic sealing suction device, a mixed gas drainage pipe, a circulating filtration pipe, an air separation return pipe, a recovery gas second-time purification pipe and a mobile sulfur hexafluoride recovery and purification device. The online sulfur hexafluoride leakage alarm is arranged in transformer room, a floor of the transformer room is provided with rectangular vent holes, the automatic sealing suction device is located at the lower portion of the floor of the transformer room and is arranged at the outer sides of the vent holes, an air inlet end of the mixed gas drainage pipe and an air outlet end of the air separation return pipe are communicated with the vent holes through the automatic sealing suction device; when a leakage accident happens, the emergency recovery and purification system of sulfur hexafluoride gas after leakage of the transformer in the underground substation achieves the functions of filtration and recovery of SF6 gas and derivatives of the SF6, simple separation of the large amount of air mixed in the recovered SF6 gas, and storage of the gas after separation. The system meets the legal and regulatory requirements for an accident emergency plan.

Description

technical field [0001] The invention belongs to the technical field of safe operation of transformers, and in particular relates to an emergency recovery and purification system for sulfur hexafluoride gas after a transformer in an underground substation leaks. Background technique [0002] With the development of urbanization in China, the population of big cities is more dense, there are many high-rise buildings, the power consumption is increasing sharply, and the number of transformers is also increasing. Traditional large-capacity oil-immersed transformers have a large amount of oil. Once they are prone to fire due to failure, they will It poses a serious threat to the safety of high-rise buildings and people's lives and property. Therefore, after the 1960s, sulfur hexafluoride insulating transformers have been widely used in urban underground substations in my country. Compared with traditional oil-filled transformers, SF 6 Transformers have obvious advantages: due t...

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Problems solved by technology

Once the sulfur hexafluoride insulating transformer leaks, the sulfur hexafluoride gas in it will escape in large quantities, and the leaked SF6 gas and its decomposition products will accumulate in the lower indoor space, resulting in local hypoxia and poisoning, which is harmful to The health of the personnel entering the room for inspection and inspection constitutes serious damage

[0013] There are not only sulfur hexafluoride gas and its decomposition products, but also a large amount of air in the space where the sulfur hexafluoride insulating transformer in the underground substation leaks. 6 The decomposition products in the gas can be removed by filtration, adsorption and other methods, and the SF in the space 6 Gas (generally 5%-10%) is mixed with a large amount of air (more than 90%), because the air is not easy to compress (the critical pressure of air is 37.69MPa, and the critical temperature is 132.45K; SF 6 The critical temperature of the gas is 45.55°C, and the critical pressure is 3.759MPa), it is difficult to liquefy the mixed gas. If the air is not removed, the volume of the compressed mixed gas will be very large, and there are many storage containers, which will bring a lot of trouble to the subsequent processing.

[0014] At this stage, for underground substation SF 6 There are no related products at home and abroad for the emergency recovery equipment of indoor mixed gas after the sudden leakage of the insulation transformer.

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