A peak-shaving operation method for coal-fired units
A coal-fired unit, peak-shaving operation technology, applied in the direction of control/regulation system, instrument, adaptive control, etc., can solve problems such as the influence of unit operation efficiency, achieve wide applicability, ensure flexibility, and reduce energy loss Effect
Active Publication Date: 2021-12-28
XI AN JIAOTONG UNIV
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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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[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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The invention discloses a peak-shaving operation method of a coal-fired unit. The steps are as follows: 1) According to the peak-shaving demand of the coal-fired unit, the low-pressure cylinder extraction throttling auxiliary condensate water throttling method is used to improve the operating flexibility of the coal-fired unit to meet Variable load requirements; 2) In order to meet the subsequent peak shaving requirements, the water level of the deaerator needs to be replenished to the normal water level, and the recovery rate of the deaerator water level recovery process is determined according to the sustainable time of the water replenishment process; 3) According to the peak shaving of coal-fired units Cycle loss rate ξ of the process p For evaluation criteria to reduce cycle loss rate ξ p To determine the peak-shaving operation method of coal-fired units for the optimization goal. The invention provides the performance evaluation standard and optimization target of the peak-shaving process. The circulation loss in the optimized operation mode is the smallest, and the reduction of the circulation loss can reduce the energy loss in the peak-shaving process, and save energy loss while ensuring the flexibility of the unit. . It has wide applicability and can satisfy the efficient and flexible operation of different types of units under different load changing conditions.
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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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