Formation and Removal of Nitrogen Compounds in Gasification Processes

Abstract

When gasifying nitrogenious fuels, org. and inorg. nitrogen compds. form in the gas. The main nitrogen compd. in gasification atm. is ammonia. The ammonia content of the product gas has ranged in pressurized peat gasification processes between 6,000-13,400 ppm and hydrogen cyanide content 10-500 ppm. Decompn. and removal of nitrogen compds. can be accelerated by catalysis. The effect of several catalytic materials on the nitrogen compds. from an operating peat gasifier was measured. Nickel catalyst and ferrous materials proved to be most efficient in decompg. ammonia at high temp. Limestone and dolomite did not have any strong catalytic effect on the decompn. of ammonia in the atmospheres studied. The calcareous and ferrous materials can increase the ammonium content of the gas at low temps. by converting part of the org. nitrogen into ammonia if gas contains high tar loading. [on SciFinder (R)]