Coal-fired power generation system simultaneously integrating slot type solar heat collecting system and tower type solar heat collecting system

Abstract

The invention relates to a coal-fired power generation system simultaneously integrating a slot type solar heat collecting system and a tower type solar heat collecting system. The tower type solar heat collecting system is combined with a reheated steam side of the coal-fired power generation system, and the slot type solar heat collecting system is combined with a high-temperature heater side of the coal-fired power generation system. In case of receiving solar radiation, the slot type solar heat collecting system replaces a partial heated surface of a 1# high-temperature heater and a partial heated surface of a 2# high-temperature heater to reduce steam extraction capacity of a high-pressure cylinder of a steam turbine according to the solar radiation condition; and meanwhile, the tower type solar heat collecting system replaces a partial heated surface of the reheated steam side, so that stable and safe operation of a boiler unit is guaranteed. When solar radiation changes, complementary operation of the solar heat collecting systems and a conventional thermal-power coal-fired unit is realized by regulating feedwater flow at a slot type solar heat collecting system side and cold regenerated steam flow at a tower type solar heat collecting system side. The invention discloses a more stable and practical integration idea for energy-saving reconstruction of a conventional coal-fired power plant.

Description

technical field [0001] The invention belongs to the technical field of integrated power generation of solar energy and coal-fired thermal power units, and in particular relates to a coal-fired power generation system that simultaneously integrates trough-type and tower-type solar heat collection systems. Background technique [0002] At present, the efficiency of my country's new high-parameter, large-capacity supercritical and ultra-supercritical units has approached or reached the international advanced level. The way to further increase parameters and increase capacity to improve unit efficiency will be restricted by technical bottlenecks such as materials. Purely from the internal considerations of the unit, the potential for further reduction of coal consumption is already very small. And in the conventional coal-fired power generation system, the massive consumption of fossil energy has caused environmental problems such as smog and acid rain, and also produced a large ...

AI Technical Summary

Problems solved by technology

However, the effective integration of traditional conventional coal-fired power plants and trough solar heat collection systems is mostly concentrated on the heat recovery system of the unit, that is, the trough solar energy is used to replace the extraction steam in the regenerator of some units to increase the temperature of the boiler feed water, but This integration method will reduce the amount of steam extraction and increase the flow rate of reheating steam, which will bring certain hidden dangers to the stable and safe operation of the boiler unit.

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