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

Chapter 44.4.16 Minimisation and abatement of SO 3 emissionsDescriptionEmissions of SO 3 or H 2 SO 4 mists originate from incomplete absorption (dry contact processes)and especially incomplete condensation (wet catalysis process) are minimised by regularmonitoring and control of process parameters, such as:• constant operation of SO 2 gas production, minimisation of SO 2 level variation• use of sulphur with a low impurity content (in case of sulphur burning)• adequate drying of inlet gas and combustion air in dry contact processes• use of larger condensation area (wet catalysis process)• optimisation of acid distribution• high efficiency candle filter and controlling• circulated quantities• concentration and temperature of the absorber acid• monitoring of SO 3 /H 2 SO 4 mist.Table 4.21 shows options for further reduction of SO 3 /H 2 SO 4 emissions.High performancecandle filtersWet scrubbingAchievable emission levelsmg/Nm 3as H 2 SO 4kg SO 3 /tonne H 2 SO 4 Investment costs Remarks