... low investment and energy consumption 3 high automation oxygen generator 1. Select Model: Oxygen capacity: 3-500NM3/h ... , product combustion-supporting, medical oxygen, petrochemical industry, papermaking, ozone producing, aquaculture, aerospace, welding and so on. oxygen generator4 ... nitric acid, vinyl chloride and phthalic acid. Very large quantities of oxygen are used in coal gasification — to ...