Study On Conditions Of The Oxidation Of Magnesium Sulfate And The Device Design

Flue gas desulfurization(FGD) with magnesium is a technology havingmagnesium oxide as desulfurizer which is to be a compound of magnesium sulfite andlittle magnesium sulfate, absorbing sulfur dioxide. Compared to FGD with calcium,FGD with magnesium is wildly applied in small thermal power plant and industrialboiler particularly for the advantages of low investment, small occ upied area andenergy consumption, besides, recovery of magnesium sulfate, greatly improving theeconomic performance, is getting the world’s attention. This article focused on the keytechnologies of recovery of magnesium sulfate in the process of FGD withmagnesium and involved in finding a highly efficient method in oxidation ofmagnesium sulfite or the most effective catalyst and uncovering the influence ofoperating conditions on the results. Based on these former work, a device design,more suitable for real industry instead of lab, is presented in the end.A series of experiment on oxidation of magnesium sulfite with no catalyst wasconducted in an organic glass column (sized: D80mm*5000mm), and the conclusionsare:1. the oxidation rate of magnesium sulfite without any catalyst is stable, immuneto dosage of magnesium in the very beginning and air flow rate.2. No obvious changeof pH value or temperature occurs in the process of oxidation.3. The optimum pHvalue for oxidation of magnesium sulfite with non catalyst is above7.4. The increaseof reaction temperature can accelerate the oxidation.Another series of experiment on oxidation of magnesium sulfite with catalystwas conducted in an organic glass column (sized: D80mm*5000mm), and theconclusions are:1. among metal ion, cobalt occupies the first as catalyst in oxidationof magnesium sulfite, followed by aluminum. Taking the final cost into consideration,a blend of cobalt and aluminum is priority.2. Mixing cobalt and aluminum in the ratioof1:2, with the concentration of both ions being0.01mol per litre, contributes ahighly positive effect to the oxidation.3. the oxidation rate of magnesium sulfite with cobalt and aluminum as catalyst is immune to dosage of magnesium in the verybeginning while increasing air flow rate and the reaction temperature do have apositive effect.4. The optimum pH value for oxidation of magnesium sulfite withcobalt and aluminum as catalyst is between8to8.5.In the end of this paper, a blue print of reaction device is presented, designed onthe basic of former work, hoped to be a help for real industry.