Three-tank heat storage type point-line focusing mixed heat collection field solar thermal power generation system

Abstract

The invention discloses a three-tank heat storage type point-line focusing mixed heat collection field solar thermal power generation system. The system comprises solar heat collection fields and a heat storage system, wherein the solar heat collection fields comprises a high-temperature solar heat collection field and a medium-and-low-temperature solar heat collection field; the heat storage system comprises a high-temperature heat storage tank, a medium-temperature heat storage tank and a low-temperature heat storage tank; heat exchange is performed between heat collected by the high-temperature solar heat collection field and a heat storage medium in the high-temperature heat storage tank; the heat storage medium in the high-temperature heat storage tank transfers the heat to a steam generation system to generate steam; the steam acts to generate power in a power generation system; the low-temperature heat storage medium after acting enters the low-temperature heat storage tank; theheat storage medium in the low-temperature heat storage tank exchange with the heat generated by the medium-and-low-temperature solar heat collection field and then enters the medium-temperature heatstorage tank; an outlet of the low-temperature heat storage tank communicates with an inlet of the medium-temperature heat storage tank through a valve; and the heat storage medium in the medium-temperature heat storage tank enters the high-temperature heat storage tank after passing through the high-temperature solar heat collection field. According to the three-tank heat storage type point-linefocusing mixed heat collection field solar thermal power generation system, energy utilization rate of solar energy is improved, power generation cost is reduced, and energy conservation and emissionreduction are achieved.

Description

technical field [0001] The invention belongs to the technical field of solar heat utilization, and in particular relates to a three-tank heat storage type point-line focusing hybrid heat collection field solar thermal power generation system. Background technique [0002] In recent years, humans have over-developed and utilized fossil energy, which has caused serious problems such as climate warming. It is necessary to make reasonable adjustments to the current energy structure and increase the proportion of renewable energy such as solar energy and wind energy in primary energy. , reduce dependence on fossil energy. Compared with photovoltaic power generation and wind power generation technology, a solar thermal power generation system equipped with sufficient heat storage capacity can stabilize the disturbance of external changeable meteorological conditions. With the aid of a scientific operation mode, the solar thermal power station can achieve continuous and stable oper...

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Problems solved by technology

However, the extreme thermal characteristics of the trough and tower solar heat collectors vary with time, that is, the ratio of the heat gain of the tower and trough solar collectors cannot be guaranteed to be the same throughout the year, so it is impossible Ensure that the flow rate of the heat exchange fluid in the tower and trough heat collection fields is consistent at all times; the investment in the heat storage system of a solar thermal power station is an important part of the cost of the power station, and the structure of four heat storage tanks will greatly increase the investment cost of the power station; For the power station, the more complex the system structure and operation mode, the lower the stability of the power station operation. During the operation of the four heat storage tank system, the operation mode needs to be adjusted frequently, which will affect the operation stability of the power station

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