Load increasing method in steam turbine unit starting process

Abstract

The invention relates to the technical field of steam turbine units, in particular to a load increasing method in a steam turbine unit starting process. The load increasing method comprises the following steps that before the steam temperature rises to a set temperature value, the steam pressure is increased to a relatively large pressure value which is larger than a set pressure value, moreover,the steam flow is increased to a relatively large flow value which is larger than a set flow value accordingly, when the steam pressure reaches the relatively large pressure value and the steam flow reaches the relatively large flow value, and the unit load reaches a set load value; and then, the steam pressure is reduced to the set pressure value, moreover, the steam flow is reduced to the set flow value accordingly, meanwhile, the steam temperature rises to the set temperature value. The unit load can reach the set load value under the steam temperature with the value lower than the set temperature value, the starting time can be shortened, and the relatively small steam temperature rise rate also can be adopted for matching so as to reduce the unit fatigue life consumption.

Description

technical field [0001] The invention relates to the technical field of the steam turbine unit, in particular to a method for increasing the load during the startup process of the steam turbine unit. Background technique [0002] At present, in the domestic power energy market, the proportion of traditional coal-fired thermal power generation is gradually decreasing, and the proportion of new energy generation represented by wind power and solar thermal power is gradually increasing. [0003] However, due to the influence of natural characteristics, the output of this kind of renewable energy is often unstable. When the power grid is dispatched, thermal power units are required to perform peak-shaving and valley operation. As a result, power plants have more prominent requirements on the flexible operation performance of thermal power units related to fast load changes and fast start-up loads. Existing studies have shown that these actions will cause drastic changes in the s...

AI Technical Summary

Problems solved by technology

It can be seen that the use of a higher flushing steam temperature and a larger steam temperature rise rate can shorten the start-up time, but it will cause a large fatigue life loss, and the large fatigue life loss during the start-up process will cause This reduces the service life of components and reduces the number of starts of the unit, which may not be able to meet the requirements of daily start and stop of solar thermal units and frequent start and stop of thermal power units during peak shaving operation.

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