Cogeneration unit with heat storage device and peak shaving method of cogeneration unit

Abstract

The invention belongs to the technical field of thermoelectricity and relates to a cogeneration unit with a heat storage device and a peak shaving method of the cogeneration unit. The cogeneration unit comprises a turbine, a heating network heater, the heat storage device and a heating network circulation water pump. A phase-change material thermocline heat storage tank and an adjusting system of the phase-change material thermocline heat storage tank are adopted in the heat storage device. The heat storage device is arranged behind the heating network heater, and part of discharged water of the heating network heater serves as a heat storage heat source. When the unit participates in peak shaving and the heat generating amount changes, the working state of the heat storage device is changed by opening and closing a valve. When the heat generating amount of the unit is large, heat is supplied through the heating network heater, and the heat storage device stores heat. When the heat generating amount is small, the heat storage device releases heat to replace part of extracted steam of the heating network heater to heat return water of a heating network, and after the return water is mixed with the discharged water of the heating network heater, the mixed water is sent to a heating station. It is ensured that the heating quality is not changed when the heat generating amount of the unit is changed, the capability of the cogeneration unit for participating in peak shaving of a power grid is improved, positive significance is achieved for absorption of renewable energy such as wind power, and the method is suitable for the cogeneration unit participating in peak shaving of the power grid.

Description

technical field [0001] The invention belongs to the technical field of thermoelectricity, and in particular relates to a combined heat and power generation unit with a heat storage device and a peak regulation method thereof. Background technique [0002] With the improvement of living standards, the peak-to-valley difference in the power system is gradually increasing. In recent years, new energy sources such as wind power and solar energy have been developed on a large scale, and there is a problem of mismatching energy supply and demand in time and space. All of these put forward higher requirements on the peak-shaving capability of the power grid. [0003] In recent years, cogeneration units have developed rapidly, and the installed capacity has reached 300 million kilowatts, accounting for nearly 30% of the installed capacity of thermal power. In March 2016, the National Development and Reform Commission and the Energy Bureau jointly promulgated the "Cogeneration Manag...

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Problems solved by technology

Due to the limitation of the peak-shaving capacity of the current power...

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