Apparatus and method for producing magnesium sulfate from coal-fired boiler flue gas

摘要

The present invention provides an apparatus and a method for producing magnesium sulfate through flue gas desulfurization, and specifically provides an apparatus and a method suitable for producing magnesium sulfate through direct crystallization in a magnesium oxide based desulfurization waste liquid tower of flue gas with a small content of oxygen like a coal fired boiler flue gas. The apparatus includes an oxygenation equipment, a flue gas desulfurization equipment, a seriflux cycling equipment, an evaporation and concentration equipment, a cycling and precipitating equipment, an oxidation equipment, a crystallization equipment, a centrifugation equipment and a drying equipment, etc. The apparatus and method of the present invention can greatly reduce electric power consumption of oxidation fans and steam consumption, as well as guarantee desulfurization efficiency and quality of a magnesium sulfate by-product, reduce lots of operation costs of the magnesium sulfate production system, and reduce desulfurization operation costs.