Coal-fired unit peak regulation operation method

A technology for coal-fired generating units and peak shaving operation, which is applied in control/regulation systems, instruments, adaptive control, etc., and can solve problems such as the impact of unit operation efficiency

Active Publication Date: 2021-02-05
XI AN JIAOTONG UNIV
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Problems solved by technology

However, while improving the operating flexibility of the unit, it

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[0038] The invention will be further described below in conjunction with the accompanying drawings and embodiments, but it should not be understood that the scope of the above subject of the present invention is limited to the following embodiments. Without departing from the above-mentioned technical ideas of the present invention, various replacements and changes made according to common technical knowledge and conventional means in this field shall be included in the protection scope of the present invention.

[0039] For a 600MW supercritical one-time reheat unit, the operating load of the unit is 600MW, in 50s, if figure 1 As shown, according to the relationship between the condensate throttling ratio and the maximum power increase value, when the peak regulation demand is 24MW, ΔD min =P goal / a=24 / 0.3=80%, that is, the minimum throttling ratio of 80% can meet the peak shaving demand. After the peak shaving is completed, the next peak shaving operation time is predicted...

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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...

Claims

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Application Information

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IPC IPC(8): G05B13/04G05B13/02
CPCG05B13/042G05B13/048G05B13/027
Inventor 严俊杰张可臻刘明刘继平邢秦安
Owner XI AN JIAOTONG UNIV
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