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

Chapter 2Production process Emission levels Remark SourceNO x expressed as NO 2 , dry gasmg/Nm 3 ppmv kg/t NH 3Reduced primary reforming 90 0.27Heat exchange autothermal reformingNO x emission levels in the range of 0.3 kg/t areachieved only if air x preheating is carried out withwaste gas from a gas turbine where low oxygen andhigh CO 2 concentrations exist. If considerable airpreheating is applied and no gas turbine waste gasescan be used, the NO x emission is of the range of 130mg/Nm 3 or 0.39 kg/tonne NH 3Ammonia removal from purge and flash gases in theammonia synthesis sectionLow NO x burners[3, European Commission, 1997]80 % reduced emission compared to fired primary reforming [1, EFMA, 2000]800.175 xx Process air heater20Auxiliary boilerAmmonia removal from purgeand flash gases in the ammoniasynthesis section[3, European Commission, 1997]< 700 Auxiliary boiler [1, EFMA, 2000]Partial oxidation560 1.04 Auxiliary boiler with low NO x burner185 0.41 Superheater with low NO x burner200 – 450 Superheater[3, European Commission, 1997]350 0.056 Thermal post-combustion after Claus unit200 – 450 0.2 – 0.5 Superheater700 1.3 Auxiliary boiler[6, German UBA, 2000]500 0.562 Superheater900 334 Thermal post-combustion[28, Comments on D2, 2004]x the source does not specify if process or combustion air is preheatedxx total, including equivalent from electricity importTable 2.7: Reported NO x emission levels for the production of ammoniaLarge Volume Inorganic Chemicals – Ammonia, Acids and Fertilisers 53