Coal coking is an important chemical process in the coal industry. The residual chemical products left in the process of coal coking can be recovered to obtain tar, ammonia, naphthalene, hydrogen sulfide, crude benzene, coke oven gas and coal tar and other chemical products. Benzene, toluene, xylene and carbon disulfide can be produced by refining and deep processing crude benzene. These products are widely used in the chemical industry, pharmaceutical industry, refractory industry and national defense industry. Coke oven gas can be used as civilian or industrial fuel.

The application of process analyzing systems in coal coking industry is introduced briefly by taking examples of composition analysis of coke oven gas

• Low pressure
• It contains significant water vapor, dust, tar, benzene, naphthalene, and sulfide and other impurities which have a serious impact on the analysis. It is necessary for the use of a pretreatment system.
• Excessive oxygen content will cause serious accidents. Thus, the online oxygen analyzer must have high accuracy, good stability and fast response speed.

The gas analyzer is mainly used for safety control. There are a large number of combustible gases, such as carbon monoxide, hydrogen in coke oven gas. If the oxygen content exceeds the standard of 1%, it will lead to safety accidents.