On-line monitoring method for heat rate of steam turbine on basis of soft measurement technology

Abstract

The invention relates to an on-line monitoring method for a heat rate of a steam turbine on the basis of a soft measurement technology. According to the method, an established expert performance knowledge base and a performance prediction model of a steam turbine regenerative system are used for calibrating data collected by measure point sensors on the operation site of the steam turbine regenerative system, and parameter data not collected on the operation site of the steam turbine regenerative system are predicted, so main steam flow can be calculated by utilizing the output power of the steam turbine, the on-line monitoring of the heat rate of the steam turbine regenerative system can be completed, and therefore accurate and reliable on-line monitoring results of the heat rate of a generator set can be obtained. The on-line monitoring method for the heat rate of the steam turbine on the basis of the soft measurement technology omits traditional condensed water flow measurement, a soft measurement method of the output power of the steam turbine is adopted to achieve on-line monitoring of the heat rate, and meanwhile the functions of calibration and prediction on field measured data are achieved.

Description

technical field [0001] The invention belongs to the monitoring technology of steam turbines, and relates to an online monitoring method of steam turbine heat consumption rate, in particular to an online monitoring method of steam turbine heat consumption rate based on soft measurement technology. The invention can be applied to the on-line monitoring of thermal power plant or nuclear power plant heat consumption rate and the prediction and analysis of the thermal performance of the steam turbine recuperation system. Background technique [0002] At present, the SIS system (Supervisory Information System in plant level, plant-level monitoring information system) of most thermal power plants has integrated online monitoring of heat rate. This heat rate monitoring method is based on flow measurement, that is, through the ASME (American Society of Mechanical Engineers (American Society of Mechanical Engineers)) standard orifice plate installed at the inlet of the deaerator to me...

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Problems solved by technology

The deviation between the actual working condition and the experimental calibration working condition is one of the main reasons for inaccurate field flow measurement.

In addition, the flow orifice plate is prone to bending and deformation with the operation of the unit, and the inlet edge is worn or corroded to cause gaps, which will further aggravate the deviation between the flow measurement value and the true value

[0007] Some scholars have also proposed that the circulating water temperature rise and circulating water flow at the cold end be used as the input conditions for heat rate measurement instead of the measurement of condensate flow. However, in the process of practical application, it is found that the accuracy of circulating water flow measured by ultrasonic method low, so applications are limited

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