| 摘要 |
PURPOSE:To concentrate gaseous CO without releasing much gaseous CO by removing CO2 from mixed gas, introducing the remaining gas into one of plural adsorption towers and changing over the tower to other tower according to the concn. of CO at the outlet of the tower. CONSTITUTION:Blast furnace gas contg. CO, CO2, N2, etc., is sent to a pretreatment tower 23 or 24 to remove CO2 and moisture. The remaining gas is introduced into a CO adsorption tower 33 and the adsorption of CO is started. The concn. of CO released from the system is measured with a CO analyzer 49 placed at the outlet of the tower 33. When the concn. exceeds a standard, other adsorption tower 34 in which regeneration has been finished is connected to the tower 33 and the gas is introduced into the tower 34. The concn. of CO is also measured at the outlet of the tower 34, and when the concn. exceeds the standard, other adsorption tower 35 is connected to the tower 34. The tower 33 in which adsorption is not carried out anymore is separated and the adsorbed gas is desorbed and recovered from a pass 50 as concd. gaseous CO. |
