Method for the heat recovery in the processes of the removal of

Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Nitrogen or nitrogenous component

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423242, 423545, 110 1J, C01B 2100, C01B 1700

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active

040512258

ABSTRACT:
A method for heat recovery in the processes of the removal of nitrogen oxides from exhaust gases containing sulfur oxides and nitrogen oxides by a catalytic or non-catalytic reduction thereof with ammonia. After passing through the reaction zone for the reduction of nitrogen oxides the down flow gases are subjected to the submitted air in a heat exchanger. The process is characterized in that the molar ratio of ammonia to sulfuric anhydride and the concentration of steam in the gases at the inlet of the heat exchanger is controlled in the range of O<NH.sub.3 /SO.sub.3 <2, preferably O<NH.sub.3 /SO.sub.3 <1.5 and more than 12% by volume, preferably more than 15% by volume, respectively, and thereby the process can continuously proceed without the production of ammonium sulfate and the deposition or adhesion thereof onto the surface of the various devices in the apparatus therefor.

REFERENCES:
patent: 3508868 (1970-04-01), Kiyoura
patent: 3864451 (1975-02-01), Lee et al.
patent: 3900554 (1975-08-01), Lyon
patent: 3914390 (1975-10-01), Kudo et al.
patent: 3928536 (1975-12-01), Lewis
patent: 3929967 (1975-12-01), Cann

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