换流站阀厅封堵隔热材料热物性及热损伤特性研究OA

In order to address the selection and evaluation of heat insulation materials for valve hall sealing systems of converter stations,this study investigates five typical heat insulation materials commonly used in valve hall sealing systems,and analyzes their thermophysical properties and thermal damage characteristics.The thermal conductivity and specific heat capacity of the five materials at different temperatures were measured using the parallel hot wire method.Thermal decomposition and thermal damage characteristic parameters at different scales were obtained through thermogravimetric analysis and cone calorimeter experiments,respectively.Based on the experimental results,a comprehensive thermal damage evaluation index system was constructed.The analytic hierarchy process and entropy weighting method were used to determine the index weights,and a linear combination weighting method was employed to calculate the comprehensive scores.The five materials were ranked by heat insulation capability from strongest to weakest as:vermiculite fireproof board＞aluminosilicate composite fireproof board＞magnesia fireproof board＞rock wool fireproof board＞aluminosilicate needle-punched blanket.The five materials were ranked by thermal damage severity from lowest to highest as:vermiculite fireproof board＜aluminosilicate composite fireproof board＜rock wool fireproof board＜aluminosilicate needle-punched blanket＜magnesium fireproof board.The results indicate that vermiculite fireproof board exhibits the highest heat insulation capability and lowest thermal damage.These findings provide theoretical support for the selection and evaluation of heat insulation materials for converter station sealing applications.