Ca(OH)[sub 2]/fly ash sorbents for SO[sub 2] removal

Journal Article · Wed Apr 01 00:00:00 EST 1992 · Industrial and Engineering Chemistry Research; (United States)

DOI:https://doi.org/10.1021/ie00004a023· OSTI ID:7024261

Ho, C S; Shih, S M ^[1]

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1. Dept. of Chemical Engineering, National Taiwan Univ., Taipei (Taiwan, Province of China)

In this paper, the reactivity of Ca(OH)[sub 2]/fly ash sorbent with SO[sub 2] is studied by using a fixed-bed differential reactor under the conditions simulating the bag filters of the spray-drying flue gas desulfurization. The source of fly ash and the sorbent preparation conditions affect the reactivity of the sorbent. The reactivity of the sorbent was found to be closely related to the content of the calcium silicate hydrate formed in the sorbent preparation. The sorbent has a much higher utilization of Ca(OH)[sub 2] than that of pure Ca(OH)[sub 2] sorbent, and in some range of Ca(OH)[sub 2] content the sorbent also has a higher SO[sub 2] capture capacity per unit weight of sorbent than that of pure lime. The fly ash from the Shin-Da plant of the Taiwan Power Company produced the best sorbent of all fly ashes in this study. The higher ratio of fly ash/Ca(OH)[sub 2], the higher slurrying temperature, the longer slurrying time, and the smaller particles of fly ash enhance the utilization of Ca(OH)[sub 2], but the water/solid ratio has an optimal value. The relative humidity in the reactor has a significant effect on the reactivity of Ca(PH)[sub 2]/fly ash sorbents, but the effect of the sulfation temperature is subtle.

• OSTI ID: 7024261
• Journal Information: Industrial and Engineering Chemistry Research; (United States), Vol. 31:4; ISSN 0888-5885
• Country of Publication: United States
• Language: English

Related Subjects

20 FOSSIL-FUELED POWER PLANTS
01 COAL, LIGNITE, AND PEAT
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
AIR POLLUTION CONTROL
SORBENT INJECTION PROCESSES
FLUE GAS
DESULFURIZATION
SULFUR DIOXIDE
SORBENT RECOVERY SYSTEMS
TAIWAN
FOSSIL-FUEL POWER PLANTS
CALCIUM HYDROXIDES
ENVIRONMENTAL IMPACTS
FLY ASH
SPRAY DRYING
WASTE MANAGEMENT
AEROSOL WASTES
ALKALINE EARTH METAL COMPOUNDS
ASHES
ASIA
CALCIUM COMPOUNDS
CHALCOGENIDES
CHEMICAL REACTIONS
COMBUSTION PRODUCTS
CONTROL
DRYING
GASEOUS WASTES
HYDROGEN COMPOUNDS
HYDROXIDES
ISLANDS
MANAGEMENT
OXIDES
OXYGEN COMPOUNDS
POLLUTION CONTROL
POWER PLANTS
RESIDUES
SULFUR COMPOUNDS
SULFUR OXIDES
THERMAL POWER PLANTS
WASTES
200202* - Fossil-Fueled Power Plants- Waste Management- Noxious Gas & Particulate Emissions
010800 - Coal
Lignite
& Peat- Waste Management
400201 - Chemical & Physicochemical Properties
010900 - Coal
Lignite
& Peat- Environmental Aspects