A detection method for three-dimensional distribution of gas phase alkali metal mass concentration in combustion flame

Abstract

The invention discloses a method for detecting three-dimensional distribution of mass concentration of gas-phase alkali metal in combustion flame, and belongs to the field of combustion detection. Themethod comprises the steps: acquiring an alkali metal atomic emission spectrum intensity image of high-alkali fuel combustion flame by utilizing spectrum acquisition equipment; establishing an alkalimetal atomic spectrum imaging model for three-dimensional distribution of the emission spectrum intensity image and the radiation intensity of a gas-phase alkali metal source item in a flame three-dimensional space; reconstructing three-dimensional distribution of the radiation intensity of the gas-phase alkali metal source item in the flame three-dimensional space by combining an inverse problemsolving method; and finally, obtaining the three-dimensional distribution of the mass concentration of the gas-phase alkali metal in the flame three-dimensional space according to the quantitative relationship between the radiation intensity of the gas-phase alkali metal source item and the mass concentration of the gas-phase alkali metal. The method is a non-contact measurement method, is easy to implement, and can realize the online detection of the three-dimensional distribution of the mass concentration of the gas-phase alkali metal in the combustion flame.

Description

technical field [0001] The invention belongs to the field of combustion detection, and more specifically relates to a detection method for the three-dimensional distribution of gas-phase alkali metal mass concentration in a combustion flame. Background technique [0002] Zhundong coal, biomass, municipal solid waste, chemical waste alcohol and waste oil and other fuels contain more alkali metals, mainly sodium (Na) and potassium (K). The alkali metals in these high-alkali fuels will volatilize into the gas phase in the combustion flame, and the gas phase alkali metals will cause problems such as contamination, dust accumulation and even corrosion on the heating surface, thereby affecting the heat exchange efficiency and service life of the combustion device, and also affecting the combustion efficiency. The maintenance of the device brings great difficulties. Therefore, the quantitative detection of gas phase alkali metals in the combustion flame of high-alkali fuel can pro...

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Problems solved by technology

However, the gas-phase alkali metal concentration obtained by the existing self-emission spectroscopy analysis technology is the cumulative value along the "line of sight" direction, which cannot reflect the alkali metal concentration at each position in the "line of sight" direction in the flame; moreover, due to the Gases and solid media have a self-absorption effect on the alkali metal atomic emission spectrum along the "line of sight" direction. Without self-absorption correction, the obtained results are often lower than the true value

[0005] In addition, in the three-dimensional space of the combustion flame, the gas-phase alkali metal released by the combustion of high-alkali fuel has a three-dimensional non-uniform distribution characteristic, that is, the concentration of the gas-phase alkali metal at each position in the combustion flame is different, and there is an urgent need for a method that can achieve A detection method for the three-dimensional distribution of gas-phase alkali metal mass concentration, but neither LIBS technology nor existing self-emission spectroscopy analysis technology can obtain the three-dimensional distribution of gas-phase alkali metal mass concentration in the three-dimensional space of the combustion flame

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