Novel trench-type solar recirculating heat collection system

Abstract

The invention provides a novel trench-type solar recirculating heat collection system, belonging to the technical field of solar heat utilization. A flash evaporator of the system is provided with a passive pressure stabilizer to ensure that the trench-type solar water heating section is single-phase flow, flashing is performed in the flash evaporator, and generated vapor is introduced into a solar superheat section to be heated. Saturated water condensed in the flash evaporator is introduced into a deaerator. The invention also provides a novel trench-type solar heat power generation system which contains the novel trench-type solar recirculating heat collection system. The novel trench-type solar recirculating heat collection system and the trench-type solar heat power generation system can enable solar energy to directly generate vapor, and no two-phase-flow conversion process exists in the solar heat collector, thereby avoiding the problems of gas-liquid nonuniform distribution and the like in the solar water heating field; and thus, stable vapor is generated, thereby being beneficial to controlling the temperature and flow of the superheated vapor, and enhancing the system stability.

Description

technical field [0001] The invention relates to a novel trough-type solar energy recirculation heat collection system, which belongs to the technical field of solar heat utilization. Background technique [0002] The trough solar heat collection system can generate medium-high temperature steam at 100-400°C, and has broad application prospects in many fields. There is a wide demand for medium-high temperature steam in industrial and agricultural production. For example, high-temperature steam at about 130°C is used in various processes in the field of synthetic rubber, and the process of plywood preparation in wood processing needs to be heated from 120-180°C. Steam, in addition, papermaking, food processing, tobacco, textiles, etc. all have varying degrees of demand for medium and high temperature steam, and the steam up to 300-400 °C that drives the steam turbine in the process of thermal power generation can also be generated by the trough solar heat collection system . ...

AI Technical Summary

Problems solved by technology

Due to the phase change heat transfer in the heat collector, under the action of gravity, the vapor and liquid are non-uniformly distributed in the heat collecting tube, especially under the condition of stratified flow, the liquid only exists at the bottom of the heat collecting tube. There is a large temperature difference between the two directions, and the resulting thermal stress can easily cause the heat collecting tube to bend and deform, causing the glass outer tube to break or making the heat collector deviate from the focus line

When the water flows in the tube and is heated by the uneven heat flux density, the stress change of the collector tube and the instability of the two-phase flow during the phase change of water limit the development of the trough solar collector system.

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