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

1995-10-11

1998-08-04

Tran, Hien

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Sulfur or sulfur containing component

422140, 422168, 422171, 422110, 422215, 422225, 422234, 42324305, 42324308, B01D 5350, B01D 5378

Patent

active

057889449

DESCRIPTION:

BRIEF SUMMARY
CROSS-REFERENCE TO RELATED APPLICATION

The present application is related to commonly owned U.S. application No. 08/532,759 filed Oct. 11, 1995 of the same title.


BACKGROUND OF THE INVENTION

1. Field of the Invention:
This invention relates to a wet-type flue gas desulfurization plant and method, and more particularly, to a wet-type flue gas desulfurization plant and method making use of a solid desulfurizing agent for economically removing sulfur oxides in flue gas exhausted from combustion equipment, such as boilers, with higher desufurization performance, for reducing abrasion of the pump for circulating the absorbing liquid and the nozzle for atomizing the same, for ameliorating the affect on desulfurization performance due to aluminum and fluorine components in the absorbing liquid, and for reducing power required for grinding solid desulfurizing agents such as limestone, with excellent controllability over a range of amount of exhaust gas and SO.sub.2 concentration therein.
2. Description of the Related Art:
Sulfur oxides in flue gas generated as a result of combustion of fossil fuel in thermal power plants, etc., particularly sulfur dioxide (hereinafter referred to simply as SO.sub.2), is a main cause of global environmental problems such as air pollution, acid rain and the like. Thus, studies on flue gas desulfurization methods to remove SO.sub.2 therefrom and development of flue gas desulfurization plants have become important.
Although various processes have been proposed for flue gas desulfurization, the wet-type is the major process. The wet-type processes include methods using sodium, calcium and magnesium compounds as an absorbent, respectively. The sodium method, above all, is excellent in reactivity between the absorbent and SO.sub.2, but the sodium compounds used are very expensive. For this reason the calcium method using relatively cheaper calcium compounds such as calcium carbonate is most widely employed as a flue gas desulfurization system for large boilers in power plants.
The desulfurization methods using such calcium compounds in the absorbing liquid are generally classified into spraying, wetted wall and bubbling systems, depending on the particular gas-liquid contacting method. While each system independently has outstanding characteristic features, the spraying system is considerably popular and reliable, and is thus the most widely used worldwide. The conventional spraying desulfurization system once comprised three towers, i.e., a cooling tower for cooling and dust-removal treatment of the exhaust gas, a desulfurization tower for spraying absorbing liquid into the exhausted gas for reaction with SO.sub.2 and an oxidation tower for oxidizing calcium sulfite formed in the desulfurization tower. Recently, a mono-tower desulfurization system (an in-tank oxidizing method) in which the desulfurization tower provides both cooling and oxidation functions has been developed and is now becoming the most popular spraying system.
FIG. 27 shows an example of a conventional spraying mono-tower desulfurization plant. In general, such a mono-tower desulfurization system comprises a tower body 1, an inlet duct 2, an outlet duct 3, a spray nozzle 4, absorbing liquid pumps 5, a circulation tank 6, a stirring device 7, an air blower 8, a mist eliminator 9, absorbing liquid draining pipes 10, a gypsum draining pipe 11, a limestone supplying pipe 12, a hydroextractor 13, pH meters 21 and the like. Several arrays of spray nozzles 4 are arranged horizontally and several stages thereof are arranged vertically. The stirring device 7 and the air blower 8 are connected to the circulation tank 6 located in a lower portion of the desulfurization tower where the absorbing liquid collects, while the mist eliminator 9 is arranged at an upper portion of the desulfurization tower or in the outlet duct 3.
Exhaust gas A exhausted from a boiler is introduced to the desulfurization tower body 1 from the inlet duct 2 and exhausted through the outlet duct 3. At the same time, the absorbing liquid is pumped to the

REFERENCES:
patent: 4490341 (1984-12-01), Cares
patent: 4696804 (1987-09-01), Shinoda et al.
patent: 5686053 (1997-11-01), Kikkawa et al.

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