Flue gas desulfurization device and desulfurization method by magnesium oxide process

Abstract

The invention belongs to the technical field of atmospheric environment protection, and particularly relates to a flue gas desulfurization device and desulfurization method by a magnesium oxide process. The invention provides a reaction tank using a circulation-oxidization integrated structure in a desulfurization process, and adds clear liquid return, filtrate recovery and other steps, thereby overcoming the defects of complex technique, high investment, low magnesium oxide regeneration rate, high energy consumption, high operating cost and the like in the traditional magnesium oxide laundering-regeneration desulfurization process. The invention is especially suitable for flue gas desulfurization of medium / small machine sets in China, and has active actions on energy source comprehensive utilization and environmental protection in China.

Description

(1) Technical field [0001] The invention belongs to the technical field of atmospheric environment protection, and in particular relates to a magnesium oxide method flue gas desulfurization equipment and a desulfurization method. (2) Background technology [0002] At present, the desulfurization project of large-scale boiler equipment in coal-fired power plants in my country has basically been completed, and most professional desulfurization companies have turned their attention to flue gas desulfurization of small and medium-sized units, and the desulfurization process of small and medium-sized units is also constantly developing. [0003] Magnesium oxide is used as a desulfurizer, and its chemical reactivity is much greater than that of calcium-based desulfurizers. my country's proven magnesium oxide reserves are about 16 billion tons, accounting for about 80% of the world's total. It is of great significance to develop a mature magnesium oxide desulfurization process....

AI Technical Summary

Problems solved by technology

[0004] However, through the follow-up investigation of magnesia desulfurization projects in recent years, it is found that after long-term operation, the traditional magnesia washing-regeneration desulfurization process generally has the following problems: 1. The process is complicated and the investment is large; 2. Magnesium oxide low regeneration rate

Calcination of magnesium sulfite to regenerate magnesia requires a temperature above 800 degrees Celsius, and calcination of magnesium sulfate to regenerate magnesia requires a higher temperature. With the increase of magnesium sulfate content in the system, the conversion rate of magnesia is getting lower and lower; 3. Actual operation high cost

Poor control of the regeneration process will cause large heat loss and consume a large amount of reduced carbon at the same time; 4. Scaling in the tower

Because the regeneration rate of magnesium oxide is low, the desulfurization efficiency is reduced. In order to maintain a high desulfurization efficiency, the pH value needs to be controlled above 7, which will lead to fouling in the absorption tower after long-term operation.

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