Abstract: In recent years, aerogel felt has been widely used in the petrochemical industry as an efficient thermal insulation material. In practical engineering, the composite insulation structure of aerogel felt and traditional insulation material can improve the heat preservation performance, decrease the thickness of insulation layer and ensure the economics of insulation engineering. A series of experiments were designed for the pipe with a nominal diameter of 300 mm and a medium temperature of 400°C to explore the optimum thickness of the aerogel felt insulation layer in the composite insulation structure, and the aerogel felt was compounded with different traditional insulation materials such as aluminum silicate needle blanket and rock wool to compare their insulation properties. This research provides guidance for piping insulation in the petrochemical industry

Key words: piping insulation, aerogel felt, composite insulation structure, thermal insulation and energy saving