Solar medium-high-temperature loop heat pipe steam generator

Abstract

The invention relates to a solar medium-high-temperature loop heat pipe steam generator which is composed of a loop heat pipe (1), a straight-through all-glass vacuum pipe (2), a steam pocket (3) and a sealing ring (4). The loop heat pipe (1) is a closed loop formed by an evaporation section (5), a condensation section (6), a first heat insulation section (7(A)) and a second heat insulation section (7(B)), the first heat insulation section (7(A)) is a steam ascending pipe, the second heat insulation section (7(B)) is formed by a condensing liquid descending pipe (12) and a U-shaped liquid storage pipe (13), the straight-through all-glass vacuum pipe (2) and the evaporation section (5) are placed coaxially to form an annular non-vacuum space (20), two ends of the annular non-vacuum space (20) are sealed by adopting sealing rings (4), and the steam pocket (3) is in sealed connection with the condensation section (6) of the loop heat pipe (1). The solar medium-high-temperature loop heat pipe steam generator is suitable for groove-type solar DSG technology, high-efficiency phase change of the heat pipe is utilized for heat transfer to heat water in the steam generator so as to directly generate high-temperature steam, system cost is lowered, and system running reliability is improved.

Description

technical field [0001] The invention relates to solar photothermal utilization technology in the field of renewable energy, in particular to a solar medium-high temperature loop heat pipe steam generator, which is mainly used in a trough solar direct steam generation (Direct Steam Generation, DSG) system. Background technique [0002] As a renewable energy source, the development and utilization of solar energy is one of the effective ways to achieve green and sustainable development. The trough solar DSG thermal power generation technology is an economical and effective way to realize the high temperature heat utilization of solar energy, and it is of great significance to solve the problems of fossil resource shortage, environmental pollution and greenhouse effect. The trough DSG system directly uses water / steam as the heat transfer medium, which is environmentally friendly, the heat collection temperature is not limited by the heat transfer medium, and at the same time av...

AI Technical Summary

Problems solved by technology

However, the separate gravity heat pipe (loop heat pipe) uses flanges to connect metal hoses and stainless steel pipes, and the reliability of the heat pipe in long-term operation is not high; Large flow resistance

In addition, when the evaporation section of the loop heat pipe is placed horizontally, the flow of the heat transfer working medium is complicated, and an efficient heat transfer loop cannot be formed, which further limits its heat transfer performance

At present, the research on the return (loop) heat pipe is mostly focused on the heat dissipation process of electronic components on a small scale, and the poor heat transfer performance on a large scale, especially when the evaporation section is placed horizontally, greatly limits its application.

Generally speaking, there are few reports on the research and development of the trough DSG collector system in China at present.

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