Coal-fired unit peak regulation operation method

Abstract

The invention discloses a coal-fired unit peak regulation operation method, which comprises the following steps of: 1) according to the peak regulation requirement of a coal-fired unit, improving theoperation flexibility of the coal-fired unit by adopting a low-pressure cylinder steam extraction throttling auxiliary condensed water throttling mode so as to meet the variable load requirement; 2) in order to meet subsequent peak regulation requirements, supplementing the water level of a deaerator back to a normal water level, and determining the recovery rate of the water level recovery process of the deaerator according to the sustainable time of the water supplementing process; and 3) determining the peak regulation operation method of the coal-fired unit by taking the cycle loss rate xip of the peak regulation process of the coal-fired unit as an evaluation standard and taking reduction of the cycle loss rate xip as an optimization target. According to the method, the performance evaluation standard and the optimization target of the peak regulation process are provided, the circulation loss amount under the optimized operation mode is minimum, the energy loss in the peak regulation process can be reduced by reducing the circulation loss, and the energy loss is saved while it is guaranteed that the flexibility of the unit is improved. The applicability is wide, and the efficient and flexible operation of different forms of units under different load change conditions is met.

Description

technical field [0001] The invention relates to the field of optimized operation of the peak-shaving process of a coal-fired unit, in particular to a peak-shaving operation method of a coal-fired unit. Background technique [0002] Global use of renewable energy sources such as solar, wind, wave and tidal energy has been increasing dramatically. However, the intermittent and uncertain characteristics of renewable energy affect the stability of the power grid, resulting in severe power reduction. Therefore, the operational flexibility of coal-fired units is an important factor to ensure the stability and economic operation of the power grid. However, while improving the operating flexibility of the unit, it will have a negative impact on the operating efficiency of the unit. How to reduce the energy loss of the system while ensuring the improvement of flexibility will be beneficial to the economical operation of coal-fired units. Condensation throttling is an effective met...

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Problems solved by technology

However, while improving the operating flexibility of the unit, it will have a negative impact on the operating efficiency of the unit

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