Gas turbine combustion state parameter monitoring system based on TDLAS technology

Abstract

The invention discloses a gas turbine combustion state parameter monitoring system based on a TDLAS technology. The gas turbine combustion state parameter monitoring system comprises a laser emissionmodule, a laser transmission module, a laser data analysis processing module and a combustion state display module which are sequentially connected. During working, required incident laser is generated through the laser emission module; the incident laser and the laser absorbed by the flow field of a combustion chamber are transmitted through a laser transmission module, and a laser signal is converted into an electric signal; effective electric signals are extracted through a laser data analyzing and processing module, flow field temperature, pressure and H2O concentration are inverted, pressure pulsation characteristics are analyzed, combustion efficiency is calculated, and whether flames exist or not is judged; the combustion flow field temperature, the pressure pulsation characteristics, the flame, the combustion efficiency and the like are displayed through a combustion state parameter display module. The combustion state parameters of the gas turbine are measured by adopting a non-contact method, the method has the advantages of no interference to the flow field, wide measurement range, high precision, quick response, simple system composition and the like, and the combustionstate monitoring system of the in-service gas turbine can be simplified.

Description

technical field [0001] The invention belongs to the technical field of gas turbines, in particular to a monitoring system for combustion state parameters of gas turbines based on TDLAS technology. Background technique [0002] The main task of gas turbine combustion diagnosis is to obtain state parameters such as combustion chamber pressure, temperature, and composition through effective methods, and then judge the combustion state of the combustion chamber, realize combustion stability, combustion temperature diagnosis, etc., and cooperate with the gas turbine control system to ensure that the combustion chamber Always operate in a safe, stable and low-emission state. [0003] The premise of combustion diagnosis is to realize the monitoring of combustion state. One is to monitor whether there is a flame in the combustion chamber, and the other is to monitor whether the outlet temperature of the combustion chamber meets the requirements and whether the combustion of the comb...

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Problems solved by technology

[0006] In order to solve the problems of complex composition of the gas turbine combustion state monitoring system in service and low measurement accuracy of state parameters such as pressure pulsation and combustion temperature, the present invention provides a gas turbine combustion state parameter monitoring system based on TDLAS technology. The system is based on laser wavelength modulation absorption method, using the near-infrared laser output can be combustor gaseous H 2 O absorbs two single-mode lasers with different wavelengths, and makes the laser pass through the flow field of the combustion chamber, and then uses a photodetector to convert the laser spectral signal absorbed by the water vapor in the combustion chamber into an electrical signal, and analyzes the two different wavelengths The light intensity and signal width of the laser absorption line, the line function, the second harmonic peak and other information, inversion of the combustion chamber flow field temperature, flow field pressure and H 2 O component concentration information, and according to the flow field pressure fluctuation calculation and analysis of information such as the frequency and amplitude of the combustion chamber pressure fluctuation, according to the H 2 O concentration and H in the complete combustion of natural gas 2 The ratio of O concentration to calculate the combustion efficiency of the combustion chamber, according to the H before and after ignition of the combustion chamber 2 The difference analysis of O concentration determines whether there is flame in the combustion chamber and other information, and at the same time realizes online monitoring of combustion state parameters such as flow field temperature, flow field pressure pulsation frequency and amplitude, and combustion efficiency, and judges whether there is flame in the combustion chamber in real time

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