Large-scale high-efficiency heat storage system based on steam jet and its operation control strategy

Abstract

Large-scale efficient heat storage system based on steam jet flow and its operation control strategy, the heat storage system includes steam extraction pipeline, steam jet system, heat storage tank, temperature detector, upper water distributor, lower water distributor, Hot water storage circulation system and hot water supply circulation system; steam jet system includes jet orifice system and flow control system. The jet orifice system is divided into three layers of jet orifices, and the steam flow is distributed according to the temperature distribution characteristics of cold water, from bottom to top , the flow rate of the three-layer jet nozzle hole gradually decreases, and the flow distribution is realized by the flow control system. The flow meter measures the real-time total extraction flow, and sends the flow distribution signal to the two PID controllers as a given value, and the corresponding valve acts Complete the closed-loop control of the three-layer nozzle flow, and realize large-scale and efficient heat storage based on steam jet flow. The invention can fully contact the steam and the cold water in the heat storage process of the steam jet flow, realize rapid heat exchange, and improve the reliability and peak-shaving flexibility of thermal power plant energy storage and heat storage.

Description

technical field [0001] The invention relates to the technical field of flexible peak regulation of heating units, in particular to a steam jet-based large-scale and high-efficiency heat storage system and its operation control strategy. Background technique [0002] my country's current power consumption structure determines that the peak-to-valley difference of the power grid is very large. In the context of a large number of heating units in the northern region, the heat-fixed power mode has significantly reduced the peak-shaving capacity of the heating units. Peak is a much-needed question. [0003] At present, the peak shaving of heating units mainly relies on boiler load reduction, main steam temperature reduction and pressure reduction, electric boilers, and adding hot water tanks to improve peak shaving capabilities. Highly respected for its unique advantages. However, at present, most of the steam on the steam turbine side heats the cold water through the heat excha...

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Problems solved by technology

However, at present, most of the steam on the steam turbine side heats the cold water through the heat exchanger, and the cold water is heated and stored in the heat storage tank. Not only is the system complex, but also the heat exchange efficiency is low, the heat exchange time is long, and the system inertia is large. Therefore, a design is made. The steam direct jet heat storage system is very meaningful for the rapid peak regulation of the heating unit

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