TREATMENT OF GASES FROM CONVERTER

1421148 Cleaning exhaust gases from steelmaking converter K BAUM [trading as VERFAHRENSTECHNIK DR ING KURT BAUM] 20 Dec 1972 [20 Dec 1971] 58872/72 Heading C7D [Also in Division F4] A steel making converter 10 comprises tuyeres 16 through which O 2 , N2, Air, Ar, and hydrocarbons can be blown in the hydrocarbon surrounding the O 2 blast, and a gas-collection unit comprising a water-cooled hood 27 and a movable skirt 28. The off-gases pass into a stack 40 and a Venturi scrubber 41, thence to a secondary Venturi scrubber 44, and then either through valve 54 or to a stack 51 and torch 52. The skirt 28 can be adjusted either to allow air to enter the hood 27 and react with the off-gases, or to seal the hood. The scrubbed off gases are monitored by a partial pressure sensor 68 (for O 2 ) and an infra-red sensor 69 (for CO, CO 2 , and H 2 O), and when the off-gases reach the desired calorific value they are directed through pipe 53 and valves 58 to storage. The sensor 68 also. monitors changes in combustion conditions and shuts down the skirt 28 when stoichiometric conditions are achieved. When the converter 10 is tilted, the gases are collected by auxilliary hood 66. Powdered materials, e.g. iron oxide, CaCO 3 , CaO, CaF2 may be introduced through the tuyeres from container 31.