Coupled power generating system using solar thermal collector assisted coal-fired unit

Abstract

The invention provides a coupled power generating system using a solar thermal collector assisted coal-fired unit. The system comprises a coal-fired boiler power generating system, a solar thermal collector field, a circulating pump and a hot oil heat exchanger, wherein the coal-fired boiler power generating system comprises a generator and a condenser, a condensate pump, multiple stages of low-pressure heaters, a deaerator, a feed pump, multiple stages of high-pressure heaters, a coal-fired boiler and a steam turbine, which are connected in series in sequence; the steam turbine drives the generator and the steam exhausted by the steam turbine enters the condenser; the solar thermal collector field, the circulating pump and an oil chamber of the heat exchanger are connected to form a circulation loop; and a part of feed water from the inlet end of the high-pressure heater at one stage is sent to the high-pressure heater at the next stage, the cold reheat steam inlet or the feed pump steam turbine inlet after being heated by the heat exchanger. The system has the following beneficial effects: as the solar thermal collector field and the traditional coal-fired boiler power generating system are organically bonded, the coal consumption of the power plants is greatly reduced and the environmental pollution of the power generating system is reduced while the power supply stability is ensured.

Description

technical field [0001] The invention relates to a coupled power generation system using a glass cover vacuum trough solar heat collector to assist a coal-fired unit, and belongs to the technical field of power generation. Background technique [0002] At present, thermal power generation still occupies a dominant position in the existing power supply system. The thermal power generation system has the advantages of mature technology and convenient adjustment. The disadvantage is that it needs to consume a large amount of coal resources, and the energy utilization rate is low (the thermal efficiency is about 40%). The emission of harmful gases such as carbon dioxide is large, causing serious pollution to the environment. [0003] The start-up boiler of a thermal power plant is generally built in a new power plant and the first unit. Its purpose is to supply steam to the starting unit during the start-up process of the first unit, and when the unit restarts due to failure, it ...

AI Technical Summary

Problems solved by technology

When the heat collection temperature of the system is higher than 400°C, its heat collection efficiency is reduced, for example, when the solar radiation value is 800W / m 2， , the heat collection efficiency at 500°C is about 22.5% lower than that at 250°C

Constrained by the conditions of low geometric concentration ratio and low heat collection temperature, the thermal power conversion efficiency of the power subsystem in the trough solar thermal power generation system is low, and its power generation cost is difficult to further reduce

In addition, the solar power generation system also has the problem of poor stability, which limits the further development of this power generation technology to a certain extent.

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