Ammonia decomposition unit

The ammonia vapors from distillation column A/B and C at 85-95°C enters ammonia decomposition furnace and under the high temperature and action of nickel catalyst, the nitrogen compounds such as NH3 and HCN etc is reduced and decomposed and become N2 and H2 and CO. The reaction is as follows: NH3 → HCN → CO The gas having high temperature, about 900°C containing N2, H2, CO and CO2 generated after reaction is called tail gas. Tail gas is first cooled to 270-300°C through waste heat boiler. The recovered heat produces saturated steam of which is sent to main steam line network. Tail gas from waste heat boiler is cooled further to 190-210°C by pre-heater of boiler water and finally cooled to 80°C with circulating cooling water in tail gas cooler. Cooled tail gas is vent to atmosphere through a chimney.