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

A technology of exhaust steam pressure and steam turbine, which is applied in the field of on-site measurement and calculation to determine the influence of exhaust steam pressure of steam turbines in power plants on the economics of units, and can solve problems such as lack of verification means.

Active Publication Date: 2013-07-10
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 heat rate 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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  • Field calculating method for confirming influence on unit economy by exhaust steam pressure of power plant turbine

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Embodiment 1

[0192] as attached figure 1 A 660MW steam turbine generator set is shown, wherein 1 is a boiler, 2 is a high pressure cylinder, 3 is a medium pressure cylinder, 4 is a high pressure heater, 5 is a deaerator, 6 is a feed water pump, 7 is a condenser, and 8 is a For the condensate pump, 9 for the generator. 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 , reheat steam inlet temperature T rh1 and other related operating data, this is the data obtained in step 1; when the operating conditions allow, adjust the steam turbine exhaust pressure greatly, and collect the steam turbine exhaust pressure after the unit...

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Abstract

The invention relates to a field calculating method for confirming influence on unit economy 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 inlet steam flow of the turbine, 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 a unit heat rate 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 heat rate 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 field measurement and calculation method for determining the influence of the exhaust steam pressure of a steam turbine of a power plant on the economy 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 heat consumption rate of the generator set. For general large-scale units, the change of exhaust steam pressure by 1kPa will directly affect the heat consumption rate 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-coo...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M15/00
Inventor 杨海生
Owner STATE GRID CORP OF CHINA
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