Method for determining running state of gas turbine

Abstract

This invention discloses a method for ascertaining operating state of combustion turbine, which comprises the following steps: a) setting three measuring points in fuel conveyer tube, air compressor inlet pipe and turbine draught flue, installing routine measuring device and sampling device; b) measuring fuel constituent and flow quantity of measuring point 1, air component of point 2, gas component of point 3; c) inputting the measured date of three points to computing unit; d) computing air-flow Mair, gas-flow Mgas, and burning completeness eta B, according to said components and fuel flow Mburn. Said invention can apply routine flow measuring method, which overcomes the difficulty of hard measurement.

Description

technical field [0001] The present invention relates to a method for determining the operating state of a gas turbine, in particular to a method for determining the operating state of a gas turbine with air, gas and fuel components, as well as the calorific value and flow rate of the fuel as the core. The operating status at a moment: the intake flow rate of the compressor, the combustion efficiency, the gas turbine inlet temperature and the exhaust flow rate of the gas turbine, thus providing the necessary parameters for the operation and analysis of the gas turbine. Background technique [0002] In recent years, the gas turbine and its combined cycle power generation technology have developed rapidly in the power industry because of their advantages of high efficiency and environmental protection. In developed countries, gas turbines and gas-steam combined cycle generator sets have become the main units bearing the base load, and have become the main technology for improvi...

AI Technical Summary

Problems solved by technology

However, this method requires sufficient installation space on site, which is not easy to achieve in practice

[0004] The second is the gas flow at the outlet of the gas turbine: the gas flow pipe at the outlet of the heavy-duty gas turbine used in power plants is large in diameter, and is often followed by waste heat recovery devices, such as waste heat boilers, etc., so the flow pipe is short. Existing flow measurement methods cannot be used here

Due to the close combination of the combustion chamber and the gas turbine, it is very difficult to install the measuring points. At the same time, cooling air is constantly mixed in, making the distribution of the temperature field very uneven, and it is difficult to measure the temperature value accurately. In this way, the first definition Cannot be directly measured in actual operation

The gas turbine inlet temperature determined by the second definition needs to be determined by inserting the measuring probe deep into the first-stage nozzle ring of the gas turbine, which is also difficult to realize in terms of the structure of the gas turbine

When determined by the third definition, it is necessary to accurately determine the air flow and fuel volume, and the air flow is difficult to measure accurately because of the large diameter of the flow pipe

At present, in actual operation, the on-site determination of gas turbine inlet temperature is mostly calculated based on the exhaust gas temperature of the gas turbine. The prerequisite for this method is that the operating state of the gas turbine must be normal and run in accordance with the predetermined characteristic line, which may deviate from the normal state. In practice, it is also unrealistic

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