A flue gas desulfurization zero-emission resource processing system and method

Abstract

The invention provides a flue gas desulphurization zero-emission resource disposal system and method. The flue gas desulphurization zero-emission resource disposal system comprises a desulphurization tower, an oxidation tank, a dehydration machine, a filtrate tank, a backflow system and a reaction tank. The desulphurization tower stores and circulates magnesium hydrate slurry and enables the magnesium hydrate slurry to react with sulfur-containing smoke so as to obtain desulphurization waste water. The oxidation tank obtains the desulphurization waste water and enables the desulphurization waste water to perform reaction under the catalytic action of a catalyst so as to obtain a waste water treating fluid. The waste water treating fluid is dehydrated by a dehydration machine, a filter cake and filtrate are obtained, and the filter cake is directly discharged out. When the preset concentration is not reached, the filtrate flows into a filtrate tank and is delivered back to the desulphurization tower through the backflow system for cyclic use. When the preset concentration is reached, the filtrate reacts with liquid ammonia in the reaction tank so as to obtain recoverable magnesium hydrate and ammonium sulfate. The system adopts the mode of magnesium hydrate and ammonium sulfate preparation to replace a conventional magnesium desulphurization and recovery process, is high in economic benefit and achieves greater resource recycling and reusing. In addition, calcination is not needed, the process is simpler and more convenient, the cost is lower, and environmental pollution and resource waste are avoided.

Description

technical field [0001] The invention relates to the technical field of flue gas desulfurization technology, in particular to a resource processing system and method for zero emission of flue gas desulfurization. Background technique [0002] Mineral combustion such as coal mines is still one of the main ways for human beings to obtain energy in the development of today's society. While this process provides heat energy, it also produces a large amount of SO 2 and air pollutants such as smoke and dust. Flue gas desulfurization is the only desulfurization method for large-scale commercial application in the world, with mature technology and reliable operation, mainly including wet method, semi-dry method and dry method. Wet desulfurization process is currently the most widely used desulfurization technology. Among them, compared with the widely used limestone-gypsum flue gas desulfurization process, magnesium desulfurization has the advantages of high desulfurization effici...

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a flue gas desulfurization zero-emission resource processing system and method to solve the existing magnesium flue gas desulfurization process in the actual application of complicated process, high operating cost, insufficient utilization of recyclables, Recycled products have poor economic benefits and are likely to cause environmental pollution

Images