Correction method for optimization of sliding pressure of large steam turbine

Abstract

The invention discloses a correction method for optimization of sliding pressure of a large steam turbine generator set of a power plant. The current research on optimization of the sliding pressure of the large steam turbine generator set operating under the low load to ensure that the generator set can operate with excellent performance under the sliding pressure during the low-load operation has great significance in improvement of the operating efficiency of the generator set. The correction method is characterized in that correction factors are adopted to correct the sliding pressure control curve of the generator set, that is, the relevance relation of the load of the generator set, the main steam pressure and the opening of the high-pressure regulating valve is expressed as Cn*Ng varies as Cp*P0*Cv. Since the specific correction factors are introduced for control elements, the load of the generator set and the main steam pressure of the control curve of the generator set under the sliding pressure in the sliding pressure deviation factor correction method, the invention ensures that the steam turbine generator is in the mode of operating under the best sliding pressure, andcan maintain the high operating efficiency of the generator set all the time.

Description

technical field [0001] The invention relates to a correction method for optimizing sliding pressure of a large steam turbine generator set in a thermal power plant. Background technique [0002] Due to the continuous development of the social economy, the society's demand for resources has grown rapidly, and the supply of electricity and coal has also become tense. The continuous rise in coal prices has directly caused the increase in power generation costs, and the linkage mechanism of electricity prices has lagged behind due to the influence of the country's overall economic environment. All these have brought huge operating pressure to power generation companies, and corporate profits have dropped sharply or even suffered losses. What power generation companies can do is to reduce unit energy consumption and minimize power generation costs. Therefore, energy saving and consumption reduction in the operation of thermal power units has become an objective need for the surv...

AI Technical Summary

Problems solved by technology

However, during the daily operation of the steam turbine, the change of the condenser pressure due to seasonal changes or the increase of the main steam flow due to the unit’s external extraction of steam for heating, etc., often cause the high-pressure valve opening given by the steam turbine control system to deviate from the expected one. Optimum sliding pressure valve position, which will have an adverse effect on the sliding pressure operation efficiency of the unit

Images