Solar thermal utilization system combined with gas-steam combined cycle

Abstract

The invention discloses a solar thermal utilization system combined with gas-steam combined cycle, which comprises a solar condensation heat collection subsystem, a refrigeration subsystem, a heat exchange device, a heat storage device and a gas-steam combined cycle power subsystem, wherein solar radiation energy is transformed into heat energy; a heat carrier preheats air and fuel which are used by the gas-steam combined cycle power subsystem through the heat exchange device; and then the heat carrier after the heat exchange drives the refrigeration subsystem for refrigeration to reduce the temperature of the air in an intercooler. The system gradiently utilizes the heat energy provided by the solar condensation heat collection subsystem, solves the problem of low utilization rate of solar energy, and also solves the problem of low temperature of the air at an outlet of an air compressor with multi-stage compression and intermediate cooling; and the system reduces the power consumption of the air compressor on the basis of ensuring the temperature of the air which enters a combustion chamber, improves the power generation efficiency of the gas-steam combined cycle, and achieves the aims of energy conservation and consumption reduction.

Description

technical field [0001] The invention belongs to the technical field of solar heat utilization, and in particular relates to a solar heat utilization system combined with a gas-steam combined cycle. Background technique [0002] A summary of solar thermal power generation and gas-steam combined cycle power generation in the prior art is as follows. [0003] 1. Slot line focused solar thermal power generation system [0004] The trough-type line-focusing solar thermal power generation system is a form of solar thermal power generation that uses trough-type line-focusing mirrors to meet the requirements of light concentration. The trough-type line-focusing mirrors mostly track the sun one-dimensionally, and the concentration ratio is between 40 and 80. During the period, the temperature of the heat-collecting working medium is generally lower than 400°C. The system usually consists of a trough-type concentrating heat collection device, a heat storage device, a power generatio...

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Problems solved by technology

[0009] From the above analysis, it can be seen that the current trough-type line focusing method can generate medium-temperature energy of about 400°C. If this part of energy is directly used for power generation, the average annual power generation The efficiency is about 10%, which is at a relatively low level; although the heat collection temperature of the tower solar thermal power generation system has increased, the capacity of the power plant should not be too large; the gas-steam combined cycle power generation system is subject to the resistance of the gas turbine material Due to the limitations of temperature, wear resistance and corrosion resistance, the improvement of combined cycle power generation efficiency has been restricted.

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