Teknisk och ekonomisk analys av ny teknik för att simultant reducera emissioner av NOx och SOx från förbränning

Sammanfattning: To avoid environmental problems such as eutrophication and acidification, it is necessary toreduce emissions of nitrogen and sulfur oxides (NOx and SOx) from combustion ue gases.As of now, there are several established ways to remove NOx and SOx, but these are usuallyperformed in separate facilities. This project has dimensioned and evaluated a simultaneousprocess which is based on the absorption of NOx and SOx. The two main components ofthe process are a reactor, in which chlorine dioxide (ClO2) is used as an oxidizing agent,and a subsequent absorber where water and sodium hydroxide (NaOH) are used to controlthe absorption. Various parameters' impact on removal efficiency has been examined bysimulation in Aspen Plus. The main parameters which has been investigated in this projectare the molar ratio ClO2/NO into the reactor, fresh water consumption, NaOH consumptionand the height of the absorber. Values of these parameters have been established and haveresulted in removal efficiencies of 97.7 % and 100 % for NOx and SOx respectively. In AspenPlus, a cost estimate was made which has resulted in capital and operating costs of 140MSEK and 187 MSEK/year. This corresponds to an annualized cost of 197 MSEK/year.These results depend on several parameters and assumptions made during the simulation.