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

Chapter 44.3 Current emission and consumption levelsFigure 4.7 and Figure 4.8 show the correlation between SO 2 levels in tail gases and the SO 2 conversion rates. Figure 4.9 shows the correlation between the specificSO 2 loads in tail gases and the SO 2 conversion rates. Table 4.7 shows achieved SO 2 conversion rates and SO 2 emission levels. Table 4.8 shows achieved SO 2emission levels to air, Table 4.9 gives some example data for waste waters from H 2 SO 4 production before waste water treatment and Table 4.10 shows solid wastesfrom production of H 2 SO 4 .SO 2 conversion rates in %170099,9599,999,8599,899,7599,799,6599,699,5599,56001600Tail gas SO2 level in mg/Nm 31500140013001200110010009008007006005004003006758491011SO 2contentbefore bed 1in % v/v12450300150Tail gas SO2 level in ppm20010000Figure 4.7: Conversion rates of 99.5 to 99.9 % and tail gas SO 2 levels in relation to the SO 2 content before bed 1This figure is based on [57, Austrian UBA, 2001, 58, TAK-S, 2003] and relates mainly to double contact/double absorption processes, see Section 4.4.2.Note: for the conversion from ppm to mg/Nm 3 , a factor of 2.93 is used162 Large Volume Inorganic Chemicals – Ammonia, Acids and Fertilisers