Field calculating method for confirming influence on unit generating power by exhaust steam pressure of power plant turbine

Abstract

The invention relates to a field calculating method for confirming influence on unit generating power by exhaust steam pressure of a power plant turbine. The field calculating method is based on a real-time computing function of DCS, influence of change of main steam inlet steam pressure of the turbine, main steam inlet steam temperature, hot reheat inlet steam pressure and hot reheat steam inlet steam temperature in the process of operation of a unit is excluded, and only value of influence on the unit generating power by the exhaust steam pressure of the turbine is calculated. The field calculating method solves the problem of accuracy of factors of influence on the unit generating power by exhaust steam pressure change of the turbine adopted in energy conservation optimization operation or technical improvement of a power plant, and is simple and convenient to use on a field.

Description

technical field [0001] The invention relates to a method for on-site measurement and calculation for determining the influence of the exhaust pressure of a steam turbine in a power plant on the generating power of a unit. Background technique [0002] With the increasing pressure of national energy conservation and emission reduction, more and more attention has been paid by power plants to improve the operating economy of existing operating units, especially large turbogenerator units. Among the parameters that affect the operating economy of the generator set, the change of the exhaust pressure of the steam turbine has the most obvious influence on the generating power of the generator set. For general large-scale units, a 1kPa change in exhaust pressure will directly affect the generating power of the unit by nearly 0.5% to 1%. However, this data also has great differences for different types of units, such as air-cooled units and wet-cooled units, units with different c...

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Problems solved by technology

[0003] At present, the characteristic coefficient of the influence of the steam turbine exhaust pressure on the generating power of the unit is generally obtained by the power plant directly using the correction curve provided by the steam turbine manufacturer, and there is a lack of a simple and direct verification method on site

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