Flexible regulation and control system and method based on adjustable heat source coupling steam jet heat storage unit

Abstract

The invention discloses a flexible regulation and control system and method based on an adjustable heat source coupling steam jet heat storage unit. The system is composed of an adjustable heat source heat supply system, a heat storage system and a peak regulation and frequency modulation control system. The peak regulation and frequency modulation control system comprises a peak regulation and frequency modulation controller, an electric heating load monitoring and predicting device, an electric load monitoring device, a thermal load monitoring device, a first actuator and a second actuator. The adjustable heat source comprises main steam extraction and steam turbine extraction which can serve as heat sources at the same time or independently to heat the heat storage system, the peak and frequency regulation capacity of the unit is improved through the adjustable heat source, and the flexible regulation margin of the unit is increased. The peak and frequency modulation control system monitors the electric load and the thermal load in real time, predicts load fluctuation, rapidly adjusts the generating capacity and the heat supply capacity by adjusting the opening degree of a corresponding valve, and meanwhile sends surplus steam in the daytime to a heat storage water tank to be stored and then sends the steam to a heat user for heat supply at night, so that the unit runs in a low-load mode, and energy conservation and emission reduction are achieved. Therefore, the peak and frequency regulation function of the unit is realized.

Description

technical field [0001] The invention relates to a flexible control system and method based on an adjustable heat source coupled with a steam jet heat storage unit. Background technique [0002] There are a large number of cogeneration units in northern my country, and their operation mode of "determining electricity by heat" makes the electrical output and thermal output have a strong coupling relationship. It is only about 10% of the installed capacity of power generation, and the contradiction between thermoelectricity is prominent. [0003] The amount of steam extracted from the steam turbine is limited. If the heat source is only the steam extraction of the steam turbine, the peak regulation and frequency regulation of the entire system will be limited by the steam extraction volume of the steam turbine. If the adjustable heat source is set, the peak and frequency regulation margin of the entire system can be increased. , thereby improving the flexibility of the unit. ...

AI Technical Summary

Problems solved by technology

Traditional hot water storage tanks use heat exchangers to heat cold water with steam. The heat exchange efficiency is low, the system is complicated and the thermal inertia is large. It is only suitable for peak regulation and cannot participate in frequency regulation. This limits the application of hot water heat storage technology in thermal electrolysis to a certain extent Coupling Applications

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