Method for optimizing steam distribution way of steam turbine

Abstract

The invention relates to a method for optimizing a steam distribution way of a steam turbine, which is characterized by comprising the following steps: calculating a regulating stage characteristic curve according to the structure parameter of a regulating stage; measuring steam temperatures and pressures in the front of all regulating air valves, steam pressures behind the regulating air valves and steam temperature and pressure behind the regulating stage in the prior steam distribution way of the steam turbine and calculating to obtain steam flows passing through all corresponding regulating air valves; calculating to obtain starting areas of all the regulating air valves by combining steam pressure specific values in the front and the rear of all the regulating air valves, the steam pressures and the temperatures in the front of the regulating air valves, and the steam flows passing through the regulating air valves; randomly giving an overlapping degree value between every two regulating air valves and giving the steam temperature and the pressure in the front of the two regulating air valves and respective opening degrees to calculate the steam pressures behind all the regulating air valves, the steam pressure behind the regulating stage, the steam flows of all regulating air valves and the relative inner efficiency of the regulating stage; and selecting the optimal steam distribution way of the steam turbine according to the principle that the relative inner efficiency is maximal and a relation curve between the lifting range and the flows of a regulating air valvegroup is a straight line.

Description

technical field [0001] The invention relates to the field of optimized operation of thermal equipment, and relates to a method for optimizing steam distribution mode of a steam turbine. Background technique [0002] With the development of my country's electric power industry, the capacity of the power grid has gradually expanded, and the peak-to-valley difference in electric load has also increased, reaching 30% to 50% of the highest load. In general, hydropower in the power grid has a small proportion and is mostly run-of-the-river, and is mainly used for irrigation, industry and domestic water. It cannot meet the capacity requirements of the peak-to-valley difference; in addition, the power unit of a large-capacity nuclear power plant must carry a basic load due to its economic and technical characteristics. This requires the high-parameter and large-capacity thermal power units with basic loads to participate in peak-shaving operation. [0003] At present, there are so...

AI Technical Summary

Problems solved by technology

Due to the limitation of the actual operating conditions of the steam turbine, the test method is not convenient to optimize the selection of multiple steam distribution schemes, resulting in the fact that the actual steam distribution mode of the steam turbine cannot reach the optimal state

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