For transformer oil polluted by impurities such as water and dust, the plate and frame type pressure filter can be used, after several cycles of filtration. Its principle is to use water filter paper to absorb water and filter impurities. Because of its simple structure and convenient handling, it has also been widely applied.
The vacuum oil filter is widely used now. It not only removes the moisture and gas in the oil completely, but also removes tiny impurities effectively. Coarse filtration is made of metal strainer and strong magnet. Fine filtration usually filters 1 ~ m tiny impurities.
Generally, silica gel or activated alumina is used as adsorbent. In the sewage treatment system, the silica gel is fully contacted with the Shandong transformer oil, and the silica gel is easily replaced. The silica gel can be installed in the silica gel tank, and the silica gel is loaded into the small cloth bag and can not be dispersed. After heating, the Shandong transformer oil is sent into the silica gel tank for a certain period of time, making it fully exerting the adsorption effect and then injecting the oil filter into the net oil tank.
In the process of treatment, it should be monitored regularly to determine the adsorption effect. When the adsorption effect is not obvious, we should consider replacing silica gel. The general silica gel dosage accounts for about 3% to 5% of the oil by weight. The waste oil treatment system should be separated from the new oil treatment system so as to avoid cross contamination. Tanks and containers that are used for waste oil must be thoroughly cleaned before they can be used for the normal production of the oil system.
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