Ammonia-ammonium sulfate method dual circulation three segments desulfurizing tower

Abstract

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.

Description

technical field [0001] The invention relates to the field of wet flue gas desulfurization, in particular to an ammonia-ammonium sulfate flue gas desulfurization tower. Background technique [0002] At present, in the application examples of domestic ammonia-ammonium sulfate desulfurization process, some directly adopt conventional single tower. The ammonia-ammonium sulfate desulfurization process adopts a conventional single tower, and there are mainly the following technical obstacles. 1) In a conventional single tower, the circulating absorption liquid is directly in contact with the high-temperature flue gas, which not only slows down the absorption reaction, but also decomposes part of the reaction products, affecting the absorption effect. 2) The conventional single tower directly oxidizes ammonium sulfite to ammonium sulfate in the desulfurization circulating liquid pool. In order to ensure the quality of the effluent by-products, the main component of the circulating...

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Problems solved by technology

Therefore, the single tower has a certain influence on the desulfurization efficiency

3) Ammonia is easy to volatilize

If the supplementary method of conventional single tower and desulfurizer is adopted, it is very easy to cause ammonia to carry and escape, which will affect the utilization rate of ammonia and cause secondary pollution of ammonia

4) Conventional single tower, the solution concentration often deviates from the optimum oxidation concentration of magnesium sulfite, and the oxidation rate is not ideal

5) Conventional single tower, if the circulating liquid concentration is high, it is easy to produce aerosol phenomenon; if the circulating liquid concentration is low, the energy consumption in the subsequent by-product extraction process will be high, increasing the cost of desulfurization

The multi-tower combination can solve the above-mentioned problems of the conventional single tower, but the system is complicated, the flow resistance of the flue gas is large, the energy consumption is high, and the device occupies a large area

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