What are the types of on-line water gas analyzers used in the Texaco gasification process? What is their principle of operation?
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What other types of online analyzers for water gas are available in the Texaco gasification process, in addition to chromatography and infrared spectroscopy? What is their principle of operation? If you could explain the principles of chromatography and infrared analysis for determining gas composition!
The original poster has mentioned two types; there should also be a mass spectrometer, and ideally it would be a chromatography-mass spectrometry combination
The analysis methods and instruments for syngas have no inherent connection with the processes used. For the analysis of water gas/syngas, if it is a compositional analysis, chromatography is the best choice, as it combines separation and analysis functions, which are difficult to achieve simultaneously with other analytical methods. However, the chromatographic analysis results are batch-based, not continuous. For the analysis of some individual components, infrared gas analyzers can be used, but their sensitivity and resistance to interference are far inferior to those of chromatography. The greatest advantage of infrared gas analyzers is continuous analysis. A netizen upstairs talked about mass spectrometry; I think it’s an illusion, especially in the case of chromatography-mass spectrometry coupling. I won’t discuss the reasons any further; if you’re interested, you can look for some books on online analysis.
Chromatography utilizes column separation technology, followed by detection using various detectors； To measure different components using infrared spectroscopy, filters corresponding to those components are typically used; infrared light of the wavelength specific to each component is passed through a pneumatic detector for detection. There are two common types of pneumatic detectors: thin-film capacitors and microflow meters ； There are two types of solids; since you are using natural gas, you don’t need them – they are photoconductive and thermoelectric. There are even more detectors available for chromatography: in the past, FID, TCD, FPD, and ECD were commonly used, while nowadays DID can also be employed for natural gas analysis. As for other specialized detectors, there are estimated to be hundreds of them; a post on the forum provides a detailed description, so I won’t go into further detail here.