Method for reducing uncertainty of steam turbine performance test

Abstract

The invention discloses a method for reducing uncertainty of a steam turbine performance test. The method comprises the following steps of: 1, installing a flow orifice plate or an ISA1932 nozzle recommended by ISO 5167-2003 on a first-stage high-pressure heater drainage pipeline, and installing a pressure measuring point on the positive pressure side of the flow measuring point; 2, preferentiallyselecting the flow orifice plate, and then selecting the ISA1932 nozzle; 3, closing all high-pressure heater and deaerator accident drain valves in the test; 4, increasing the running water level ofthe first-stage high-pressure heater to ensure that the drainage end difference is less than 8K; 5, adopting a pressure transmitter with the uncertainty not larger than +/-0.1% for measuring the high-pressure heater drainage pressure; 6, verifying a flow measuring device in a laboratory before testing; 7, calculating a total drainage leakage amount of a high-pressure heater accident through adopting a heat balance method and a direct measurement result difference value; and 8, calculating the drainage enthalpy of the first-stage heater according to a steam thermodynamic property formula by pressure and temperature. According to the method, the uncertainty of the performance test result of the steam turbine can be remarkably reduced under the condition that high-pressure heater shell side drainage or accident drainage has inner leakage, and the total leakage amount can be quantitatively analyzed.

Description

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine

Login to View More

AI Technical Summary

Benefits of technology

The technology described by this patented design helps reduce errors when testing different types of equipment used for power generation during emergency situations such as fires caused by leaks that may occur at higher pressures than usual. It also allows accurate measurement of how much liquid has been drained away without affecting other components inside it's structure.

Problems solved by technology

Technological Problem: It's difficult to accurately control the amount of cooling liquid injected onto specific parts inside a power plant without causing damage such as cracks on their surfaces when subjected to severe conditions like extreme temperatures over 200°c. Existing methods have limitations in controlling these issues, leading to potential safety hazards related to failure testing under harsh environments where high pressures (up to 320 MPa) may occur frequently.

Images