Stable heat-collection control method for light field of trough type light-focusing solar thermal power plant

Abstract

The invention discloses a stable heat-collection control method for a light field of a trough type light-focusing solar thermal power plant, and solves the problem of poor stable heat-collection control effect of an existing light field. The stable heat-collection control method for the light field of the trough type light-focusing solar thermal power plant is characterized by comprising the following steps: (1) a condenser main loop of the light field of the trough type light-focusing solar thermal power plant is evenly divided into at least two temperature detection areas, each temperature detection area corresponds to a condenser unit and a branch loop of the condenser unit, a reference temperature value of each temperature detection area is set, and the temperature detection area feeds back detected actual temperature of heat transfer oil to a condenser local controller; (2) the condenser local controllers compare the actual temperatures of the heat transfer oil, which are fed back by the temperature detection areas, with the reference temperature values of the temperature detection areas, and then at least one of the following operations is carried out: (A) the rotating speed of a heat transfer oil pump is adjusted; (B) the working attitude of the condenser is converted; and (C) the flows of the branch loops of the condensers are adjusted.

Description

technical field [0001] The invention belongs to the technical field of trough-type solar thermal power generation, and in particular relates to a method for controlling heat collection with stable light field of a trough-type concentrating solar thermal power station. Background technique [0002] The solar thermal power generation system uses solar concentrators to heat water by concentrating solar energy, and generates water vapor to drive turbines to generate electricity. In areas rich in solar energy resources, solar thermal power generation systems have a power generation efficiency as high as 24%, and they can also be used in combination with conventional combustion technologies to form a multi-energy complementary power generation system. [0003] In the trough concentrating solar thermal power station, the inlet temperature T1 and outlet temperature T2 of the heat transfer oil, the energy output to the steam turbine (that is, the energy Q collected by the light field...

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Problems solved by technology

[0004] In the prior art, when the direct solar radiation changes, the light field depends on adjusting the flow m of the heat transfer oil in the concentrator through the heat transfer oil pump t In order to ensure the stability of the total energy output to the steam turbine and heat storage system, and the power station is generally equipped with only one heat transfer oil main pump located in the heat transfer oil main pipeline, which is responsible for circulating the heat transfer oil. Therefore, when adjusting the heat transfer oil main pump, each The flow rate of the heat transfer oil branch where the concentrator circuit is located will have a significant hysteresis, and this hysteresis can easily cause the temperature of the heat transfer oil to overheat for a period of time

When the heat transfer oil exceeds the working temperature, it will degrade, which will adjust the heat absorption effect of the heat transfer oil, greatly reduce the performance of the power station, and accelerate the replacement cycle of the heat transfer oil

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