Adopting the internationally recognised new catalytic oxidation purification technology, the catalytic purification tower adopts a new type of internal cooling unit, so that the temperature distribution of the bed is in the appropriate reaction area, the normal production of heat balance, reducing the use of electric furnaces, and prolonging the life of the catalyst.

The desulphurisation and decarbonisation gas purification technology using polyethylene glycol dimethyl ether as the absorbing liquid is known as Seleoxl technology in foreign countries and NHD technology in China; this technology is listed in the National Key Industries Cleaner Production Technology Orientation Catalogue of the State Economic and Trade Commission.

Wet decarbonisation is a widely used decarbonisation process with low energy consumption and is widely used to remove CO2 and H2S from ammonia, methanol feedstock gas, refinery gas, city gas and natural.

The flue gas of a sleeve kiln (lime kiln) is characterised by low pressure, high temperature, dust content, low CO₂ content and contains impurities such as NOx and SO₂.