T/CIC 401-2021 Determination of Inorganic Harmful Gases in Waste Gas from Fixed Pollution Sources in the Metallurgical Industry by High-Temperature Non-Dispersive Infrared Absorption Method

Scope

Main technical content: The high-temperature infrared analysis method, also known as the high-temperature original state infrared analysis method. In the process of constructing this method, the entire process is carried out at temperatures above 185°C for high-temperature sampling, high-temperature filtration, and high-temperature infrared detection and analysis. There is no need for gas drying, dilution, or cooling pretreatment, allowing direct analysis of samples and minimizing process losses, resulting in more reliable measurement results. The specific technical methods include the following: (1) Measurement of gas components based on the infrared absorption characteristics of substances. Infrared light is directly measured through the gas, and as the substance absorbs specific wavelengths, the light intensity weakens, reflecting the change in concentration. (2) Single-beam dual-wavelength measurement method. In this method, one measurement filter and one reference filter are introduced into the optical path. Therefore, the wavelength band captured by the measurement filter is precisely within the infrared absorption wavelength of the measured component, while the wavelength band captured by the reference filter is outside the infrared absorption range of the measured component. Thus, the light intensities affected by the presence or absence of the measured gas can be calculated separately. (3) Gas filtration-related method. In this method, the optical filtration performance of the measurement filter and the reference filter is the same. To saturate the infrared absorption, the infrared spectrum of a specific substance has almost completely faded. The reference filter is additionally equipped with a gas filtration tank for high-concentration gases, allowing the measurement of CO, NO, HCl, NH3, and CH4. (4) Oxygen measurement. Oxygen measurement is achieved through zirconia cells. The measurement gas and reference gas (ambient air) are separated by a zirc

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