Division I Primary or process-related techniques, such as:
United Kingdom
| Technique | Description | Applicability |
|---|---|---|
| Process optimisation and use of promoters or additives | ||
| (i) Process optimisation | Combination of operating conditions or practices aimed at reducing NOX formation, e.g. lowering the excess oxygen in the flue-gas in full combustion mode, air staging of the CO boiler in partial combustion mode, provided that the CO boiler is appropriately designed | Generally applicable |
| (ii) Low-NOX CO oxidation promoters | Use of a substance that selectively promotes the combustion of CO only and prevents the oxidation of the nitrogen that contains intermediates to NOX: e.g. non-platinum promoters | Applicable only in full combustion mode for the substitution of platinum-based CO promoters. Appropriate distribution of air in the regenerator may be required to obtain the maximum benefit |
| (iii) Specific additives for NOX reduction | Use of specific catalytic additives for enhancing the reduction of NO by CO | Applicable only in full combustion mode in an appropriate design and with achievable oxygen excess. The applicability of copper-based NOX reduction additives may be limited by the gas compressor capacity |
Notes on Division
Footnotes
- f1
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When antimony (Sb) injection is used for metal passivation, NOX levels up to 700 mg/Nm3 may occur. The lower end of the range can be achieved by using the SCR technique.