Molten salt tube-shell type steam generating device and method

Abstract

The invention provides a molten salt tube-shell type steam generating device and a molten salt tube-shell type steam generating method. The device comprises a tube-shell type heat exchanger, a steam separation output component and a heating and heat preservation component, wherein the steam separation output component is arranged on the top of the tube-shell type heat exchanger, and the heating and heat preservation component is arranged on the outer side of the container wall of the tube-shell type heat exchanger; the tube-shell type heat exchanger is provided with a top tube box, a tube body and a bottom tube box in sequence from top to bottom, wherein the inside of the tube body is provided with tube bundles of which both ends are fixedly connected with the tube body by tube plates, and the gaps between the tube bundles are filled with molten salt; and the outer side of the tube body is provided with a molten salt inlet tube and a molten salt outlet tube, and the bottom tube box isprovided with a water inlet tube and a water outlet tube. The method comprises the following steps of: pre-heating the tube body; and orderly performing molten salt filling, hot water filling, and steam separating and outputting. The device has the advantages of big effective heat storage capacity, long-term stable operation, and relatively low manufacturing cost and maintenance cost, and can meet the requirements on large-scale solar mid- and high-temperature heat utilization in industry.

Description

technical field [0001] The invention relates to solar medium and high temperature heat utilization technology, in particular to a molten salt shell-and-tube steam generating device and method. Background technique [0002] As a clean energy technology with low cost and large-scale prospects, solar energy medium and high temperature heat utilization technology is a strategic new energy technology for the sustainable development of my country's national economy. The medium and high temperature heat utilization system of solar energy is mainly composed of a concentrating system, a heat absorption system, a heat storage system and a heat utilization device. Since solar energy is intermittent and unstable, it is difficult to meet the requirements of large-scale continuous and stable energy supply in industrialization. Therefore, it is necessary to develop efficient heat storage technology to effectively solve the problems of solar energy conversion, transmission and storage. [...

AI Technical Summary

Problems solved by technology

In large-scale solar energy medium and high temperature heat utilization systems such as solar thermal power generation, there are some defects in the molten salt casing steam generator: (1) because the heat energy absorbed by the pipe wall is directly transmitted to the water working medium in the pipe through the molten salt in the casing, The molten salt mainly plays the role of heat transfer, and because the heat storage capacity of the molten salt in the casing is small, the heat storage function of the molten salt working fluid and the molten salt tank has not been fully utilized; (2) due to the real-time changes of the solar radiation outside the casing , the internal energy change of the molten salt in the casing is coupled with the evaporation process, and the parameters of the entire heat transfer process and water vapor of the casing system are not easy to control; (3) Due to the complex structure of the serpentine heat-absorbing tube body, the processing of the casing is difficult , so it is difficult to scale up

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