Segment-based ammonia flue gas desulfurization process and device thereof

Abstract

A segment-based ammonia flue gas desulfurization process and a device thereof combine traditional absorption towers with a crystallization tower. A regeneration tank is arranged at the outside of the tower. The processes of absorption of SO2, sulfite oxidation, regeneration of desulfurization solution, crystallization of ammonium sulphate and ammonia volatilization are carried out respectively. The process system effectively improves the removal rate of SO2, improves the oxidation of the sulfite, strengthens the crystallization of the ammonium sulphate and reduces the escape of ammonia in outlet smoke. The standard discharge of the smoke can be realized after the smoke is processed by the system. The removal rate of SO2 is above 95 percent. The whole system process is simple and has no secondary pollution. And the by-product ammonium sulphate has high economic value and can be especially configured by enterprises with fixed ammonium sources.

Description

technical field [0001] The patent of the present invention belongs to the technical field of flue gas desulfurization, specifically an ammonia flue gas desulfurization process and device. Background technique [0002] Flue gas desulfurization is a major topic in current environmental governance, and hundreds of processes have been researched and developed so far. At present, the mainstream flue gas desulfurization process is still the wet calcium method, but the problems of calcium desulfurization technology such as large water consumption, easy to cause secondary pollution, and uneconomical operation have become increasingly prominent. [0003] Ammonia desulfurization technology uses ammonia as an absorbent to remove SO from flue gas 2 craft. The ammonia desulfurization process has many characteristics. First, ammonia is a good alkaline absorbent, which is stronger in alkalinity than calcium-based absorbents. Moreover, ammonia absorbs sulfur dioxide in flue gas through a ...

AI Technical Summary

Problems solved by technology

However, there are still problems in the traditional ammonia method: (1) The contact between the circulating liquid and the high-temperature flue gas is not conducive to the absorption reaction and affects the absorption effect; (2) The loss of ammonia in the absorbent is large, there is a problem of ammonia escape, and it causes secondary pollution; (3) The concentration of the solution deviates from the optimum oxidation concentration of ammonium sulfite, and the oxidation effect is not ideal; (4) the quality of the by-product ammonium sulfate is low, and it is difficult to produce economic value

These problems have restricted the development of ammonia desulfurization technology

Images