Study And Optimal Design On Two-tank Molten Salt Heat Storage System In Solar Power Plants

At the present stage, the issues of environment and energy have become the two majorparts of global concern. More and more attention has been paid to solar energy, which is aclean and renewable energy. But the biggest drawback is that the solar energy is notcontinuous. Therefore, the design of the heat storage system has played a very importantrole in the development and application of solar power plants. This paper focuses ondesigning the sensible heat storage system for solar thermal power plant.The design is divided into three major parts.Firstly, this paper classified the heat storage system depending on the regenerativestructure and run media of the system, and expounded the operating characteristics and theadvantages and disadvantages of the various systems. And then compared the economy ofthe solar power station in oil and salt medium and molten salt medium. By calculating andcomparing of the cost of heat storage system and collector field in two power stations. Weultimately draw a curve of proportion: the pure salt power plant’s economy is better whenthe ratio of the cost of collector field in pure salt power plant and oil salt power plant isunder the curve.Secondly, the optimal design of heat storage tank. For a solar power plant withconstant operating parameters, the volume of heat storage tank is a constant too. Howeverwith the height changed in the tank, all part of the structure will change. Therefore, thepaper set the height of the heat storage tank as a variable. Then establish the structuralmodel of the heat storage system. And to optimize the design of the heat storage tankdepending on fees. At last, we calculate a50MW solar power plant as a example, optimizethe design of heat storage system, finally concluded the optimal structure of the heat storagesystem.Finally, a oil-salt exchanger for the heat storage system is designed. The role of theoil-salt heat exchanger is convert energy between heat carrier fluid and heat storagemedium. Depending on the nature of the heat exchanger, select the type of shell and tubeheat exchanger, the work of the heat exchanger is to run two heat exchangers in series.Through a series of calculating and comparing. Finally the50MW solar power plant isconcluded. When using the two tank molten salt heat storage system, the best height of the heat storage tank is13.2m. The heat exchanger works by two heat exchangers connected inseries. In order to create convenient, two heat exchangers use the same type of heatexchanger tubes, and <2-4> types of shell and tube heat exchanger.