Molten salt heat storage system is the key point of solar thermal power station, which has important influence on the safety, reliability and operation cost of power generation system. Based on the analysis of the two element nitrate melt physicochemical properties, the material selection, corrosion resistance, thermal insulation, tank foundation insulation method of the high and low temperature molten salt tank were systematically studied. The optimum design scheme of molten salt tank was given from the angle of technical economy.

Pigging operation is a necessary part of the oil and gas pipeline production process, and it has great significance for the pipeline safety operation management.For pier offloading, pigging must be done when the type of oil revenues is change in the same pipeline. So a mathematical model of the nitrogen through ball pigging was established on the basis of analyzing the comprehensive influence of pigging medium on the product oil pipeline. Taking Tianjin port pier offloading pipeline for example, the calculation was done. The amount of nitrogen, inlet pressure and the pigging ball position at different time in the pipeline was obtained. The calculation results can provide some basis for the actual engineering design.