Issue:
The SITOM of an important city in the Rhône-Alpes region contacted SCCM ALP for the following problem: its incinerator treats its semi-wet fumes with lime milk. However, the latter is subject to pollution peaks in HCl (hydrochloric acid) and SO2 (sulphur dioxide) on the 2 incineration lines, which forces it to call in a specialist.
Suggested solutions from SCCM ALP:
After analysis of the existing process:
- Installation of a slaked lime silo equipped with 2 dosing screws and 2 pneumatic transport lines (1 common silo, 1 screw and 1 pneumatic transport per line)
- Optimisation of the operation of existing installations (milk of lime treatment)
- Injection of hydrated lime into the flue gas ducts at the reactor inlet
- Automatic reagent injection to prevent pollution thresholds from being exceeded
Noted improvements:
- Reduction of daily emissions during peaks:
Lowering of the threshold to 7mg/Nm3 HCl (legal obligation: 10mg/Nm3)
Lowering of the threshold to 35mg/Nm3 SO2 (legal obligation: 50mg/Nm3)
Lowering of the threshold to 35mg/Nm3 SO2 (legal obligation: 50mg/Nm3)
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