Deep peak regulation method for high-back-pressure unit

Abstract

The invention discloses a deep peak regulation method for a high-back-pressure unit, and relates to the field of deep peak regulation. The deep peak regulation method comprises the following steps that the deep peak regulation safety of the high-back-pressure unit is evaluated on the basis of blast risk evaluation of a last-stage blade of a low-pressure cylinder during low load; the heat supply steam extraction amount is increased by turning down a heat supply quick-opening valve, and the heat supply capacity of an extraction condensing unit is further improved; the steam supply potential of the extraction condensing unit is deeply excavated on the basis of turning down a medium-pressure control valve and improving reheat steam pressure; and the heat supply amount, the heat supply return water temperature and the steam supply amount of the whole plant on the day are obtained through the average environment temperature on the day, and a deep peak regulation load optimal distribution model is established. According to the deep peak regulation method for the high-back-pressure unit, the high tripping value of the exhaust steam temperature of the high-back-pressure unit of a power plant is set to be 125 DEG C, the safety is guaranteed, favorable support is provided for development of deep peak regulation work, and after high-back-pressure transformation, a path of accident water spraying is added under the condition that an original low-pressure cylinder accident water spraying pipeline is reserved, so that the air blowing phenomenon possibly generated by the unit after deep peak regulation is avoided.

Description

technical field [0001] The invention relates to the technical field of deep peak regulation, in particular to a method for deep peak regulation of a high back pressure unit. Background technique [0002] The proportion of thermal power units in the Northeast power grid in the heating season is increasing year by year, making it impossible for the power grid to effectively adjust the peak capacity by controlling the online start-up capacity, which increases the security risk of the power grid. During the heating season, the ability to accommodate wind power, photovoltaics, and nuclear power has dropped significantly, and wind curtailment is serious, affecting energy conservation, emission reduction, and energy transformation in the region. [0003] In the past ten years, a large number of units in my country have undergone high back pressure heating transformation, but considering the safety of low-pressure cylinders, the stability of heating networks, and the economical peak...

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Problems solved by technology

[0002] The proportion of thermal power units in the Northeast power grid in the heating season is increasing year by year, making it impossible for the power grid to effectively adjust the peak capacity by controlling the online start-up capacity, which increases the security risk of the power grid. During the heating season, the ability to accommodate wind power, photovoltaics, and nuclear power has dropped significantly, and wind curtailment is serious, affecting energy conservation, emission reduction, and energy transformation in the region

[0003] In the past ten years, a large number of units in my country have undergone high back pressure heating transformation, but considering the safety of low-pressure cylinders, the stability of heating networks, and the economical peak-shaving of high-back-pressure units, deep peak-shaving technology has not been used High back pressure unit, for which a deep peak regulation method for high back pressure unit is proposed

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