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

Chapter 4BAT is to minimise and reduce SO 3 /H 2 SO 4 mist emission by applying a combination of thefollowing techniques and to achieve the emission levels given in Table 4.25 (see Section4.4.16):• use of sulphur with a low impurity content (in case of sulphur burning)• adequate drying of inlet gas and combustion air (only for dry contact processes)• use of larger condensation area (only for wet catalysis process)• adequate acid distribution and circulation rate• applying high performance candle filters after absorption• control concentration and temperature of the absorber acid• apply recovery/abatement techniques in wet processes, such as ESP, WESP, wet scrubbing.Emission level as H 2 SO 4All processes 10 – 35 mg/Nm 3Yearly averagesTable 4.25: SO 3 /H 2 SO 4 emission levels associated with BATBAT is to minimise or abate NO x emissions (see Section 4.4.17).BAT is to recycle exhaust gases from product H 2 SO 4 stripping to the contact process (see Table4.6).212 Large Volume Inorganic Chemicals – Ammonia, Acids and Fertilisers