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A four-stage degassing method for insulating oil of UHV transmission and transformation transformers

A technology for transformer insulating oil and power transmission and transformation, which is applied in the field of four-stage degassing of insulating oil for ultra-high voltage power transmission and transformation transformers, can solve the problems of only being applicable, and achieves fast degassing speed, good degassing effect, and shortened air retention time. Effect

Active Publication Date: 2018-12-28
CHANGZHOU UNIV
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Problems solved by technology

[0005] The more commonly used insulating oil degassing treatment methods include: polymer film ventilation method, vacuum degassing method, mechanical vibration method, air blowing method in oil and dynamic headspace method, etc. The most widely used method is vacuum degassing separation Vacuum oil purifiers designed and developed based on the principle of this method are currently widely used, but generally only suitable for transformer insulating oil with a voltage level of 500kV and below

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  • A four-stage degassing method for insulating oil of UHV transmission and transformation transformers

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Embodiment Construction

[0016] Below in conjunction with example the present invention will be further described.

[0017] The initial pressure of the transformer insulating oil is 1 bar, the initial temperature is 30°C, and the gas content is 1% (volume ratio); it first enters the first-stage spray drying zone for degassing, and after being heated by an electric heater, the temperature of the insulating oil rises to 110°C. The oil liquid is separated into semi-mist through the spray wing, and the water in the oil evaporates rapidly into water vapor, which is pumped out by the vacuum pump, and the vacuum degree reaches 400Pa; the gas content is reduced to 0.7% (volume ratio), and then enters the second stage of Raschig Thin film evaporation is carried out in the ring area and degassed again; after degassing again, the vacuum degree of the system reaches 100Pa, its temperature reaches 125°C, and the gas content is reduced to 0.3% (volume ratio); the insulating oil after these two stages of degassing is...

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Abstract

The invention relates to degassing technology of ultrahigh-voltage power transmission transformer insulating oil, in particular to a four-stage degassing method of the ultrahigh-voltage power transmission transformer insulating oil. The four-stage degassing method includes that degassing steps are performed in a four-stage vacuum degassing tower, two-stage spray drying and two-stage thin film evaporation are combined for degassing, spray drying is adopted for first-stage and third-stage degassing, and thin film evaporation is adopted for second-stage and fourth-stage degassing; first-stage spray drying, second-stage thin film evaporation, third-stage spray drying and fourth-stage thin film evaporation are performed sequentially from top to bottom; during first-stage spray drying, a spray device is adopted to distribute oil into a filling layer from the top of the degassing tower in a form of fine liquid drops; during third-stage spray drying, the oil is collected and then sprayed; during second-stage thin film evaporation, a ring structure is adopted; during fourth-stage thin film evaporation, a scroll-type Raschig ring is adopted, so that overflow contact face of the insulating oil is increased. Through above four-stage degassing, gas content can reach less than or equal to 0.07% (by volume ratio).

Description

technical field [0001] The invention relates to the degassing technology of insulating oil of UHV power transmission and transformation transformers, especially the degassing technology of insulating oil of 500KV and above power transmission and transformation transformers. Degassing method. Background technique [0002] UHV power transmission and transformation technology is the most advanced power transmission and transformation technology in the world, and has obvious economic benefits. The treatment of insulating oil for UHV power transmission and transformation equipment is one of the technical difficulties restricting the construction of UHV power transmission and transformation grids [0003] During the transportation, storage, and operation of transformer insulating oil, due to the interference of external factors (such as temperature, pressure, oil flow, etc.), the gas, moisture, and particle impurities generated in the oil will affect the oil quality of transforme...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D19/00
CPCB01D19/0021B01D19/0036B01D19/0047
Inventor 李健胡涛林小平王凯周均
Owner CHANGZHOU UNIV
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