The hygroscopic properties of spray dryer sorbents with select additives

Conference · Thu Dec 31 23:00:00 EST 1987

OSTI ID:7130204

Yuan, C S; Rood, M J ^[1]

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1. Illinois Univ., Urbana, IL (USA)

The use of spray dryers to separate and remove SO{sub 2} and HCl gases from emissions generated by the combustion of low sulfur coal and municipal solid waste is becoming a widely accepted practice. Advantages of spray drying compared to wet scrubbing include lower capital costs, reduction in corrosion and scaling problems, elimination of a wet sludge by-product, and better reliability. Some of the disadvantages include higher sorbent costs, potential blinding of the particle control device that is downstream of the spray dryer, and low NO{sub x} collection efficiencies. Because of the spray dryer's inherent advantages, it would be useful to improve the spray dryer's ability to simultaneously remove SO{sub 2}, NO{sub x}, and HCl from flue gases while using a low cost sorbent. Results of the effort to develop a spray dryer with these capabilities is presented in this paper. Preliminary research on the use of inorganic additives to enhance the SO{sub 2} collection efficiency of spray dryers has already been performed by other researchers. However, further research pertaining to the fundamental aspects of the use of additives would be useful to describe how inorganic additives enhance the reactivity of potential spray dryer sorbents with SO{sub 2}, NO{sub x}, and HCl. This investigation focuses on the use of additives to increase the amount of H{sub 2}O adsorbed by select sorbents and to increase the chemical reactivity of the sorbent. Several inorganic deliquescent salts and oxidants were selected as additives because of their potential ability to increase the amount of liquid H{sub 2}O associated with the sorbents and to enhance the rate of oxidation of SO{sub 2} and NO{sub x} in the liquid phase.

• OSTI ID: 7130204
• Report Number(s): CONF-880679--
• Country of Publication: United States
• Language: English

Related Subjects

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& Peat-- Waste Management
010900 -- Coal
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320604 -- Energy Conservation
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54 ENVIRONMENTAL SCIENCES
540120 -- Environment
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AIR POLLUTION CONTROL
CARBONACEOUS MATERIALS
CHALCOGENIDES
CHEMICAL REACTIONS
COAL
COMBUSTION PRODUCTS
CONTROL
DESULFURIZATION
DRYING
ENERGY SOURCES
FLUE GAS
FOSSIL FUELS
FUELS
GASEOUS WASTES
HYDROCHLORIC ACID
HYDROGEN COMPOUNDS
INORGANIC ACIDS
MATERIALS
MUNICIPAL WASTES
NITROGEN COMPOUNDS
NITROGEN OXIDES
OXIDES
OXYGEN COMPOUNDS
POLLUTION CONTROL
REMOVAL
RESEARCH PROGRAMS
SORBENT RECOVERY SYSTEMS
SPRAY DRYING
SULFUR COMPOUNDS
SULFUR CONTENT
SULFUR DIOXIDE
SULFUR OXIDES
WASTES