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

A technology of exhaust steam pressure and steam turbine, which is applied in the field of on-site measurement and calculation to determine the impact of power plant steam turbine exhaust pressure on unit economy, and can solve problems such as lack of verification means

Active Publication Date: 2016-01-13
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

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0192] as attached figure 1 For a 660MW turbogenerator set shown, 1 is the boiler, 2 is the high-pressure cylinder, 3 is the medium-pressure cylinder, 4 is the high-pressure heater, 5 is the deaerator, 6 is the feed water pump, 7 is the condenser, 8 9 is a condensate pump, and 9 is a generator. In the basic operation mode of the unit, cancel the primary frequency regulation and AGC function of the unit, and keep the steam turbine inlet valve position of the unit constant, and collect the steam turbine exhaust pressure p of the unit in this stable state after the unit is running stably x1 , generator power P g1 , steam turbine inlet steam pressure P ms1 , Inlet steam temperature T ms1 , reheat steam inlet temperature T rh1 This is the data obtained in step 1; if the operating conditions permit, adjust the exhaust steam pressure of the steam turbine to a large extent, and collect the exhaust steam pressure of the steam turbine after the unit has operated to a stable operatin...

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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 method for on-site measurement and calculation for determining the influence of steam turbine exhaust pressure of a power plant on the economy 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 heat rate of the unit. For general large-scale units, a change of 1kPa in exhaust pressure will directly affect the heat rate 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 configurations of low-pressure cylinder...

Claims

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Application Information

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