The invention relates to the field of wet
flue gas desulfurization, especially to a
flue gas thionizer of
ammonia-ammiaonia
sulfate method. The thionizer is divided into three segments, wherein the lower segment of the thionizer is a circulation fluid-absorbing tank, the
middle segment of the thionizer is a concentration cooling segment, and the
upper segment is an absorbing segment. The concentration cooling segment is separated to the absorbing segment and the circulation fluid-absorbing tank by
tower-separating plate at the two end planes upper and lower. The
dual cycle three-segment thionizer of
ammonia-ammiaonia
sulfate method of the invention resolves the design
disadvantage of general single-
tower and multi-
tower. The byproduct that is ammiaonia
sulfate is concentrated by high-temperature
flue gas to reduce the temperature to a temperature propitious to absorb. The
dual cycle design of the thionizer makes the cycle absorbing liquid to be not contacted directly with the high-temperature
flue gas to control the cycle absorbing liquid at a low concentration, and is beneficial to the desulfurization clear
flue gas to avoid the condition forming
aerosol and make the solution sent to the
oxidation ditch approaching to the optimal oxidation concentration. The composite cost for
flue gas desulfurizing can be reduced, using the quantity of heat of the flue gas in the entrance to cycle concentrate the diluted solution of
ammonia-ammiaonia.