Online detection method of concentration of gas-phase alkali metal in boiler combustion flame

Abstract

The invention discloses a method for detecting the concentration of gas-phase alkali metal in boiler flame on line by directly adopting flame emission spectral analysis. The method comprises the steps of firstly, selecting a characteristic spectral line of to-be-measured alkali metal, then constructing a fitting model of the radiation intensity of the characteristic spectral line relative to flame temperature and the concentration of the gas-phase alkali metal, then determining a fitting coefficient through experimental calibration, finally, measuring a radiation spectrum of a flame object by a portable fiber-optic spectrometer, so as to obtain the flame temperature and the radiation intensity of the characteristic spectral line of the alkali metal, substituting into the established fitting model of which the fitting coefficient is known, and calculating to obtain the concentration of the gas-phase alkali metal in the flame. The method has the advantages of simple equipment, low cost and convenience in industrial field measurement, the concentration of the gas-phase alkali metal in the boiler-inside combustion flame can be conveniently and precisely detected on line, and the contents of various kinds of alkali metal can be simultaneously detected.

Description

technical field [0001] The invention belongs to the technical field of flame emission spectrum detection, and more specifically relates to an online detection method of gas-phase alkali metal concentration in a boiler combustion flame. Background technique [0002] With the development of the country, electricity consumption has gradually increased, energy consumption has increased significantly, and environmental problems have become increasingly prominent, making power plants have to use new types of coal and develop new combustion methods to cope with the dual pressures of energy and the environment. The Zhundong coal discovered in recent years has large reserves, good coal quality, and low ash content. It is a good thermal coal, but because of its high alkali metal content, it causes problems such as slagging in the furnace and ash on the heated area, which has become a difficulty in research and utilization. Biomass energy such as forest waste, agricultural waste, aquat...

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Problems solved by technology

However, for large-scale industrial furnaces, LIBS online detection technology also has obvious disadvantages: complex equipment structure, cumbersome operation, high cost, and LIBS detection does not take temperature changes into account, and the measurement conditions must be kept constant to maintain a constant temperature, which is not convenient for industrial promotion.

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