Wet-type flue gas desulfurization plant and method making use of

Details Wet-type flue gas desulfurization plant and method making use of Wet-type flue gas desulfurization plant and method making use of

1998-12-08

2000-06-27

Tran, Hien

Chemical apparatus and process disinfecting, deodorizing, preser

Chemical reactor

Waste gas purifier

422171, 422215, 422225, 422234, B01D 5350, B01D 5378

Patent

active

060803703

ABSTRACT:
A wet-type flue gas desulfurization method and plant making use of a solid desulfurizing agent in which exhaust gas exhausted from a combustion apparatus such as a boiler is brought into contact with absorbing liquid to absorb sulfur oxide from the exhaust gas into the absorbing liquid followed by neutralization of the absorbing liquid containing the sulfur oxide thus absorbed. The solid desulfurizing agent is selectively retained in an absorbing liquid neutralizing zone and the absorbing liquid, containing water as a main constituent and solid products formed from the absorbed sulfur oxide, is selectively removed from the neutralizing zone. In the neutralizing zone the upward flow of the absorbing liquid, optionally augmented by an upward flow of air or water, forms a fluidized bed of limestone particles, thereby preventing coating of the limestone by gypsum and thereby retaining reactivity of limestone. According to the present invention, coexistence of Al and F in the absorbing liquid seldom deteriorates the desulfurizing performance. Further, it is possible to reduce power and cost required to grind limestone and to achieve a higher desulfurizing performance.

REFERENCES:
patent: 4696805 (1987-09-01), Shinoda et al.
patent: 5686053 (1997-11-01), Kikkawa et al.
patent: 5788944 (1998-08-01), Kikkawa et al.
patent: 5945081 (1999-08-01), Kikkawa et al.

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