The SCR catalysts are further deactivated by catalyst poisons such as sulphur, lead, arsenic, cadmium, zinc, and phosphor compounds.
CTP has developed, in close cooperation with our customers, an innovative alternative concept to the SCR catalysts: The first regenerative thermal oxidation in the cement sector worldwide!
This is how the system works: before the waste gas leaves the rotary kiln where the cement clinker is produced a selective non-catalytic reduction: SNCR for the removal of NOx is conducted by injecting diluted ammonia solution into the rotary kiln. The waste gas is then passed over cyclones and a baghouse filter for dust removal. After this the waste gas gets into the regenerative thermal oxidiser where it is heated up to 950 ° Celsius and then oxidised. The oxidiser consists of several identical heat exchangers containing ceramic honeycomb blocks which serve as heat storage. By continuously switching between the heat exchangers the energy use is optimized so that practically no additional energy is needed to operate the system.
This, the remarkable concept of the regenerative thermal oxidiser with integrated removal of NOx, patented by CTP, has that competitive edge. The production of cement is odourless and dust-free and emissions are well below their legal limits.
- See more at: http://www.pollutionsolutions-online.com/news/air-clean-up/16/ctp_chemisch_thermische/air_pollution_control_and_odour_removal_for_the_cement_industry/16181/#sthash.EqHDtZ64.dpuf