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.

主权项

1. An apparatus for producing magnesium sulfate through flue gas desulfurization, comprising:
an oxygenation equipment, configured to increase a content of oxygen in flue gas before the flue gas enters a flue gas desulfurization equipment; a flue gas desulfurization equipment, an interior of which is provided with a sulfur dioxide absorbing and spraying region, configured to remove sulfur dioxide in the flue gas through magnesium oxide based desulfurization, and form absorption seriflux; a seriflux cycling equipment, configured to receive the absorption seriflux from the flue gas desulfurization equipment, further oxidize the absorption seriflux into magnesium sulfate seriflux therein, and then cycle the magnesium sulfate seriflux into the sulfur dioxide absorbing and spraying region and an evaporation and concentration equipment; an oxidation equipment, configured to provide air for the seriflux cycling equipment, so that at least a part of magnesium sulfite in the absorption seriflux is further oxidized into magnesium sulfate; an evaporation and concentration equipment, configured to evaporate and concentrate the seriflux cycled therein to form a concentration product; a cycling and precipitating equipment, configured to receive the concentration product from the evaporation and concentration equipment, and precipitate the concentration product, so as to form a precipitation product; and wherein, the seriflux cycling equipment, the evaporation and concentration equipment and the cycling and precipitating equipment are all arranged in the interior of the flue gas desulfurization equipment.