Effects of sorbent attrition on utilization

Technical Report · Sat Feb 29 23:00:00 EST 1992

OSTI ID:6878784

Keener, T C; Khang, Soon-Jai; Lee, S K ^[1]

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1. Cincinnati Univ., OH (United States)

Attrition of surface product levers of sulfite/sulfate may be the key to substantially increasing sorbent utilization in new dry scrubbing processes. This conclusion has been reached from research results obtained from new gas/solid contacting methods such as the Circulating Fluidized Bed Absorber and the Limestone Emission Control method. An additional savings may be reduced by the use of large initial sorbent, particle sizes which greatly reduces the cost of grinding and sorbent preparation. The objectives of project 1.7 were then to study attrition of sorbent particles in a systematic fashion in order to determine how to use attrition to increase sorbent utilization. This was to be carried out by the construction of a bench scale fluidized bed where a series of experiments were to be conducted to measure attrition of lime and limestone samples. This has been accomplished and the project proceeded as anticipated. The results indicate that attrition differs for wet and dry conditions for certain sorbents and that these differences are substantial. Under dry conditions, the results of attrition tests on carefully characterized lime samples indicate that mechanical abrasion is the primary attrition mechanism. The rate of attrition is seen to be similar to a first order chemical reaction where the bed mass (or total surface area) is analagous to reactant concentration. A model for mechanical attrition is presented which expresses the rate constant in an Arrhenius type form proportional to a pseudo attrition activation energy and excess gas energy above a minimum level. The value of this pseudo attrition activation energy for lime has been found to be 106 KJ/KG. For the attrition of wetted lime particles in a fluidized bed. the attrition rate has been found to be directly related to the volumetric flow rate of injected water.

• Research Organization: Ohio Coal Development Office, Columbus, OH (United States); Cincinnati Univ., OH (United States)
• Sponsoring Organization: STOFOH; Ohio State Government, Columbus, OH (United States)
• OSTI ID: 6878784
• Report Number(s): OCDO-93004574; ON: TI93004574; CNN: CDO/R-87-2C/B
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010800* -- Coal
Lignite
& Peat-- Waste Management
20 FOSSIL-FUELED POWER PLANTS
200200 -- Fossil-Fueled Power Plants-- Waste Management
54 ENVIRONMENTAL SCIENCES
540120 -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (1990-)
ADSORBENTS
AIR POLLUTION CONTROL
CARBONATE ROCKS
CHALCOGENIDES
CHEMICAL REACTIONS
COMBUSTORS
COMMINUTION
CONTROL
DESULFURIZATION
DOCUMENT TYPES
DRY SCRUBBERS
EQUIPMENT
FLUIDIZED BEDS
FLUIDIZED-BED COMBUSTORS
GRINDING
LIME-LIMESTONE WET SCRUBBING PROCESSES
LIMESTONE
MACHINING
MATHEMATICAL MODELS
OXIDES
OXYGEN COMPOUNDS
PARTICLE SIZE
POLLUTION CONTROL
POLLUTION CONTROL EQUIPMENT
PROGRESS REPORT
REMOVAL
ROCKS
SCRUBBERS
SCRUBBING
SEDIMENTARY ROCKS
SIZE
SORBENT INJECTION PROCESSES
SORPTIVE PROPERTIES
SULFATES
SULFITES
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
SURFACE PROPERTIES
TESTING