1、 Clean gas: from industrial by-products to high-value energy

Clean gas refers to the desorption gas produced by the pressure swing adsorption (PSA) hydrogen purification process of coke oven gas. As a byproduct of the coking process, coke oven gas originally consists of hydrogen (H2, content 54-59%), methane (CH4, content 25-27%), carbon monoxide (CO), carbon dioxide (CO ₂), and a small amount of light hydrocarbons. In industrial applications, due to its low calorific value and high content of dust, tar, and sulfur, the combustion efficiency is poor, and the high value-added hydrogen components have not been properly recovered and utilized.

Since Baosteel Group introduced the pressure swing adsorption (PSA) hydrogen purification technology in 1985, this process has gradually become the mainstream technology for hydrogen production from coke oven gas due to its advantages of low energy consumption, simple process, high degree of automation, and high hydrogen recovery rate. In the PSA hydrogen extraction process, the desorption gas generated during the reverse release and flushing stages undergoes multiple processes such as pretreatment, purification, and adsorption, resulting in a significant reduction in impurity content. The methane concentration can be increased to over 40-50%, and the calorific value can be increased by about 30%, thus forming a clean gas that can be directly utilized, especially suitable for existing coke oven gas users.

3、 Four party instrument laser Raman: one machine can handle composition and calorific value

Sifang Optoelectronics (Wuhan) Instrument Co., Ltd. provides solutions for clean gas quality analysis and calorific value determination based on laser Raman spectroscopy technology and an efficient and stable pre-processing system. This scheme achieves synchronous online monitoring of clean gas composition and calorific value through a laser Raman spectrometer, providing data support for process control, production efficiency optimization, and trade measurement.

Since 2012, Sifang Instrument has relied on its parent company (Sifang Optoelectronics Co., Ltd.)'s core gas sensing technology platform to lead the national major scientific instrument equipment development project "Research and Application of Laser Raman Spectroscopy Gas Analysis Instruments". In response to the industry's technical difficulties such as weak characteristic signals in laser Raman spectroscopy, Sifang Instrument has been deeply cultivating for more than ten years, continuously researching laser Raman spectroscopy gas analysis technology, and finally successfully developing a commercial product with independent intellectual property rights - LRGA series laser Raman spectroscopy gas analyzer, filling the technical gap in related fields in China. At the same time, with its profound technical background, Sifang Instrument has emerged in the industry and actively participated in the formulation of industry standards to promote industrial upgrading.

4、 What are the advantages of non dispersive infrared spectroscopy and laser Raman spectroscopy compared to gas chromatography?

At present, the technologies that can simultaneously analyze gas composition and calorific value mainly include gas chromatography, laser Raman spectroscopy, and non dispersive infrared spectroscopy (NDIR).

Comparison Table of Mainstream Technologies