モレタナ式吸収装置によるNO-x, SOx同時除去法
1976 年 55 巻 3 号 p. 133-142
詳細
1976 年 55 巻 3 号 p. 133-142
The MORETANA absorber is equipped with perforated trays of extremely simple construction for bringing liquid and gas into vigorous contact with each other.
The perforated trays in the MORETANA absorber have been designed with optimum hole openings, hole size and liquid-gas ratio. As the liquid-gas flow conditions in the MORETANA absorber are distinctly different from those of conventional absorbers, the gas space velocity is 4.5 to 5 m/sec and the mass transfer efficiency is of a very high order. The MORETANA absorber thus enables the treatment of 2 to 7 times more gas than conventional absorbers.
Especially when used in flue gas desulfurization units, the MORETANA absorber ensures a 95 to 99% SOx elimination rate, even with absorbents such as NaOH and lime. Besides, tbe MORETANA absorber is not prove to scaling or clogging of solidsowing to the “self-induced washing effect” provided by the vigorous mixing of gas and liquid though such phenomena are often found in conventional absorbers using slurry fluid.
Using a MORETANA absorber having the above performance, more than 90% of NOx is also eliminated simultaneously.
In the the MORETANA process, NO is oxidized by means of Cl O2 or O3 (converted to NO2) and recovered very effectively as N2 by means of sulfite generated through desulfurization reaction.
2NO+ClO2+H2O→NO2+HNO3+HCl
NO+O3→NO+O2
NO2+2NaSO3→1/2N2+2Na2SO4
NO2+2 (NH4) 2SO3→1/2N2+2 (NH4) 2SO4
NO2+2CaSO3→1/2N2+2CaSO4
As actual cases of application of the MORETANA process, four (4) industrial plants are performing satisfactorily and two (2) plants are now under construction.
