Process features (1) good reactivity and high desulfurization efficiency. The reaction intensity of wet desulfurization depends on the alkaline dissolution of desulfurizer alkali metal ions. Because the dissolution alkalinity of magnesium ions is several hundred times higher than that of calcium ions, magnesium based desulfurizer has desulfurization reaction capacity several ten times higher than that of calcium based desulfurizer. Industrial practice has proved that magnesium based desulfurizer can achieve higher desulfurization efficiency than calcium based desulfurizer, up to more than 99%. At the same time, the spray water required for magnesium based desulfurization is only equivalent to 1 / 3 of calcium based desulfurization with the same desulfurization efficiency, and the power consumption is also greatly reduced.
(2) High operation reliability
Due to the high solubility of magnesium based desulfurization products, the solid suspended solids are loose crystals and are not easy to deposit. Therefore, there is no scaling, caking, blocking and other phenomena in the calcium based wet desulfurization system, which has reliable operation and easier maintenance.
(3) Low cost
Due to the high reaction intensity, the height of magnesium based spray reaction absorber is only about 2 / 3 of that of calcium based desulfurization. Therefore, the cost of the main equipment of magnesium based desulfurization is significantly lower than that of calcium based absorber. At the same time, since the molecular weight (40) of magnesium oxide is 73% of calcium oxide (56) and 40% of calcium carbonate (limestone, molecular weight is 100), the amount of magnesium oxide required to remove the same amount of sulfur dioxide is much less than that of calcium base. Moreover, MgO is supplied in powder form, and the desulfurizer supply system is greatly simplified than calcium base desulfurization, which reduces the cost of the system. The comparison shows that the cost of magnesium oxide desulfurization equipment is generally about 10 ~ 15% lower than that of limestone / gypsum method.
(4) Low operation cost
Because the power consumption of magnesium based process is about half lower than that of limestone / gypsum method, and the investment is low, although the cost of desulfurizer is high, the comprehensive desulfurization cost is generally about 10 ~ 15% lower than that of limestone / gypsum method.
(5) High economic recovery of by-products
The direct by-product of magnesium based process is magnesium sulfite, which is oxidized to form magnesium sulfate. The actual output of desulfurization process is magnesium sulfite by-product containing a small amount of magnesium sulfate. Only by-products whose main component is magnesium sulfate can be produced by forced oxidation. Both desulfurization by-products have market utilization value, and their treatment and utilization forms should be "adjusted to local conditions", which depends on the comparison of technology and economy and the feasibility in specific projects
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