Steam-water circulating device for natural circulation of tower-type fused salt photo-thermal steam generation system

Abstract

The invention provides a steam-water circulating device for natural circulation of a tower-type fused salt photo-thermal steam generation system. The steam-water circulating device comprises a steam pocket, wherein an outlet and an inlet of the steam pocket respectively communicate with an evaporator through a descending pipe and an ascending pipe, and the steam-water circulating device is characterized in that the evaporator adopts a vertical structure and comprises an outer shell and a heat exchange shell arranged below the outer shell, an outer pipe plate is arranged at the bottom of the outer shell, a heat exchange cavity formed in the heat exchange shell is jointly defined by the outer pipe plate and the heat exchange shell, and fused salt is arranged in the heat exchange cavity; andan inner sleeve and an outer sleeve are further included. According to the steam-water circulating device, a heat exchange pipe is of a sleeve structure, the heat exchange pipe can be freely expanded,and failure of a pipe plate weld joint is avoided; and a high-temperature molten salt inlet is in direct contact with the heat exchange pipe for heat exchange, the molten salt temperature at the outlet is low, and the pipe plate thermal stress is low; and under the same condition, the steam-water circulation technology is high in circulation ratio, natural circulation is easy to achieve, and dueto natural circulation of the steam generation system, the steam-water circulating device is low in energy loss, high in stability and low in investment cost.

Description

technical field [0001] The invention relates to a steam-water circulation device suitable for natural circulation of a steam generation system of a tower-type molten salt photothermal project. Background technique [0002] With the vigorous development of renewable energy, tower-type solar thermal power generation projects are being vigorously constructed. In the steam generation system used in the existing tower solar thermal power generation projects, the steam-water circulation of the evaporator and the steam drum mostly adopts the forced circulation technology. The evaporator using forced circulation technology consumes more energy and has higher maintenance costs. A small number of evaporators use natural circulation technology, and this evaporator adopts the structure of a horizontal U-shaped tube heat exchanger, so there are problems such as low cycle rate and long start-up time. Contents of the invention [0003] The purpose of the invention is to ensure a higher...

AI Technical Summary

Problems solved by technology

The evaporator using forced circulation technology consumes a lot of energy and the maintenance cost is also high

A small number of evaporators use natural circulation technology. The evaporator adopts the structure of a horizontal U-shaped tube heat exchanger, so there are problems such as low cycle rate and long start-up time.

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