Large Volume Inorganic Chemicals - Ammonia ... - ammk-rks.net

Chapter 4EUR/yearWaste gas volume (Nm 3 /hour) at a SO 2 content in theinlet gas of 10.5 % v/v36000SO 2 waste gas concentration (mg/Nm 3 ) at an SO 2content in the inlet gas of 10.5 % v/vWaste gas volume (Nm 3 /hour) at an SO 2 content inthe inlet gas of 9.5 % v/v120040000SO 2 waste gas concentration (mg/Nm 3 ) at an SO 2content in the reaction gas of 9.5 % v/v700Operating time (hour/year) 8400Reduction of SO 2 emissions (kg/hour) 15Extra investment costsExtra energy consumption/energy losses -Extra energy consumption for the ventilator at an SO 2concentration of 9.5 % v/v (kWh/hour)68 EUR 0.044/kWh 24900Loss of steam production (40 bar) due to an SO 2concentration of 9.5 % v/v (tonnes/hour)Loss of electric energy corresponding to the loss ofsteam production (9.5 % v/v SO 2 ) (kWh/hour)1.140 EUR 0.044/kWh 14650Recovered sulphuric acid (kg/hour) 23 EUR 0.051/kg -9950Estimated annual extra costs (EUR/year) 29600Specific costs related to the reduction of SO 2 emissions (EUR/tonne SO 2 ) 232Specific extra costs related to the production of H 2 SO 4 (EUR/tonne H 2 SO 4 ) 0.204Basis: reduction of the inlet concentration from 10.5 to 9.5 % v/v SO 2 , double contact plant, 145000tonnes H 2 SO 4 /year; production lower than output capacity. Increase of the waste gas volume from36000 to 40000 Nm 3 /hour, increase of the conversion rate from 99.6 to 99.74 %.Table 4.14: Cost estimate for the increase of the O 2 /SO 2 ratio[57, Austrian UBA, 2001]184 Large Volume Inorganic Chemicals – Ammonia, Acids and Fertilisers