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A Field Calculation Method for Determining the Influence of Steam Turbine Exhaust Pressure on Generating Power of Power Plant

A technology for generating power and exhaust pressure, which is applied in the field of on-site measurement and calculation, can solve the problems of lack of verification methods, etc., and achieve the effect of convenient use and simple method on site

Active Publication Date: 2016-03-16
STATE GRID CORP OF CHINA +2
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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

Method used

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  • A Field Calculation Method for Determining the Influence of Steam Turbine Exhaust Pressure on Generating Power of Power Plant

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Effect test

Embodiment 1

[0085] For a 660MW direct air-cooled unit, in the basic operation mode of the unit, the primary frequency modulation and AGC functions of the unit are released, and the steam turbine inlet valve position of the unit is kept constant. After the unit runs stably, the steam turbine exhaust pressure of the unit in this stable state is collected. p x1 , generator power P g1 , steam turbine main steam inlet steam pressure p ms1 , inlet steam temperature T ms1 , hot reheat inlet steam temperature change T rh1 , this is the data obtained in step 1; if the operating conditions allow, maintain the same steam turbine inlet valve position as in step 1, greatly adjust the steam turbine exhaust pressure, and the collection unit will run to a stable state after the steam turbine exhaust pressure changes. Turbine exhaust pressure after running state p x2 , generator power P g2 , steam turbine main steam inlet steam pressure p ms2 , inlet steam temperature T ms2 , hot reheat inl...

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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 an on-site measurement and calculation method for determining the influence of steam turbine exhaust pressure of a power plant on the generating power of the unit. Background technique [0002] With the increasing pressure of national energy conservation and emission reduction, improving the operating economy of existing operating units, especially large-scale steam turbine generator units, has received more and more attention from power plants. Among the parameters that affect the operating economy of the generator set, the change of the exhaust steam pressure of the steam turbine has the most obvious influence on the generating power of the generator set. For general large-scale units, the change of exhaust steam pressure by 1kPa will directly affect the generating power of the unit by nearly 0.5% to 1%. However, this data is also quite different for different types of units, such as air-cooled units and wet-cooled units, un...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/34
Inventor 杨海生
Owner STATE GRID CORP OF CHINA
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