Core Viewpoint - The successful implementation of the nitrogen-sealed oil tank mist recovery technology at Yan'an Refinery significantly reduces lubricating oil gas emissions and addresses long-standing oil sludge accumulation issues [1] Group 1: Technology Implementation - The nitrogen-sealed auxiliary system maintained a micro-pressure environment in the lubricating oil tank, leading to rapid oil sludge accumulation on equipment surfaces due to the evaporation of high-temperature lubricating oil [1] - A dedicated task force was established to tackle the oil mist management technology, resulting in over 80 foundational parameter reports that informed the systematic modification of the recovery technology [1] - The project adopted a "source collection + efficient purification" approach, installing a sealed collection device at the top of the oil tank to capture evaporated oil mist and purify it through centrifugal separation and deep filtration [1] Group 2: Environmental Impact - Post-modification, the lubricating oil tank's gas emission concentration was reduced to below 2 milligrams per cubic meter, and the surface oil sludge attachment on surrounding equipment decreased by over 90% [1] - The improvement in the cleanliness of the working environment supports the company's ongoing efforts to promote green production [1]