Belonging to the technical field of
energy conservation and
environmental protection, the invention particularly relates to an energy-saving
tail gas
deamination process and equipment for production of
sodium cyanide. Specifically, high-temperature
softened water coming out of a
cracking furnace serves as a heat source of a
lithium bromide unit and returns to a
softened water pool after being cooled so as to get ready for entering the
cracking furnace again;
tail gas enters the lower part of an
ammonia absorption
tower, spray water enters the upper part of the
ammonia absorption
tower for spray
deamination on the
tail gas, the generated dilute
ammonia water is sent into a kettle liquid
heat exchanger through a dilute ammonia water pump, and then enters a
distillation tower, part of the kettle liquid subjected to
distillation deamination by the
distillation tower undergoes heat exchange by the kettle liquid
heat exchanger, and is sent as spray water by a spray water pump to two circulating water plate heat exchangers for primary cooling by cooling water, after
coming out of the circulating water plate heat exchangers, the spray water enters two cold water plate heat exchangers for secondary cooling through cold water generated by the
lithium bromide unit, and then the spray water returns to the ammonia absorption tower again to spray the tail gas. Through the recycling, the ammonia content of the tail gas can reach the production requirement of 0.8% or below.