Graded heat storage system for cogeneration unit and peak shaving method thereof

Abstract

The invention discloses a graded heat storage system for a cogeneration unit and a peak shaving method thereof. The graded heat storage system comprises a power plant system and a heat storage system.The power plant system comprises a boiler, a steam turbine high-pressure cylinder, a steam turbine intermediate-pressure cylinder, a steam turbine low-pressure cylinder, an electric generator, a condenser, a condensate pump, a low-pressure heater, a deaerator, a water-feeding pump and a high-pressure heater. The heat storage system comprises a first heat network heat exchanger, a second heat network heat exchanger, a first control valve, a first heat storage water tank, a second heat storage water tank, a steam expander, a heat user part and a heat network circulating water pump. When the power grid load quantity demand is large and the heat production quantity is sufficient, the first heat storage water tank and the second heat storage water tank store heat, and when power grid peak shaving is conducted, the electric load is decreased and the heat production quantity is decreased, the first heat storage water tank and the second heat storage water tank release the heat, so that the heat supply quality is unchanged. The graded heat storage mode is utilized, the graded heat storage system is more suitable for deep peak shaving of the cogeneration unit, the heat supply quality can be better guaranteed, and the heat energy utilization rate is increased.

Description

technical field [0001] The invention relates to the technical field of thermoelectricity, in particular to a graded heat storage system for cogeneration units and a peak regulation method thereof. Background technique [0002] With the rapid development of my country's economy and the improvement of people's living standards, the installed capacity of domestic power grids has expanded accordingly. However, due to changes in my country's electricity consumption structure in recent years, that is, the electricity consumption of the primary industry has declined, and the electricity consumption of the secondary and tertiary industries has increased, resulting in a gradual increase in the peak-to-valley difference of the power grid; at the same time, in recent years, vigorously developed New energy power generation technologies such as wind energy and solar energy have the problem of disconnection between energy supply and demand. In order to cooperate with the grid connection of...

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Problems solved by technology

This patent improves the peak-shaving capability of the cogeneration unit to a certain extent, but does not utilize the heat energy in gradients, resulting in a low utilization rate of heat energy; in addition, the patent does not take into account that the steam turbine extracts steam when the heat production of the unit decreases. The heat released by the heat and heat storage device still cannot meet the needs of heat users, which cannot guarantee that the heat supply quality will remain unchanged when the unit participates in the peak-shaving heat production of the power grid.

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