Method for correcting influence quantity of heat supply and steam extraction on sliding pressure operation of steam turbine

Abstract

According to the method for correcting the influence quantity of heat supply and steam extraction on sliding pressure operation of the steam turbine, a sliding pressure optimization operation curve under the heat supply working condition can be calculated according to test data of the pure condensing working condition, the process is simple and easy to implement, the requirement for automatic control is met, and a sliding pressure optimization test under the heat supply and steam extraction working condition is avoided. By using the method, the energy-saving and consumption-reducing work of the heat supply steam extraction unit is facilitated, and the test time and cost are greatly reduced.

Description

Technical field: [0001] The invention relates to a method for correcting the influence of heat supply and steam extraction on the sliding pressure operation of a steam turbine, belonging to the field of electric power. Background technique: [0002] In recent years, as the power peak-to-valley difference has become larger and larger, not only many high-power pure condensing thermal power units participate in peak regulation, but also cogeneration units also need to participate in peak regulation. When the thermal power unit participates in peak regulation, the deviation of the steam turbine from the design condition will lead to a decrease in the unit economy, and the sliding pressure operation is one of the effective means to improve the economy of the steam turbine at medium and low loads. During sliding pressure operation, the steam turbine keeps the high-profile door opening unchanged under different loads, and the load is realized by changing the main steam pressure. I...

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Problems solved by technology

[0004] At present, most power plants use test methods to obtain the sliding pressure curve under the heating and steam extraction conditions. This method has relatively high requirements for test instruments, test conditions and test procedures, and the implementation process is relatively cumbersome, especially During the test, it is required to adjust different heating and extraction steam volumes according to the test working conditions, but limited by the change of heat user demand, the heating and extraction steam volume often cannot meet the requirements of the test working conditions, which leads to a long test time , it takes a lot of manpower and material resources, and the fluctuation of heating and extraction steam can easily affect the test accuracy

When industrial heating and domestic heating exist at the same time, it is difficult to determine the sliding pressure optimal operating curve under the heating condition of thermal power units by means of experiments

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