Partitioning of trace element species in coal combustion systems and impacts on control
Conference
·
OSTI ID:490358
- Univ. of North Dakota, Grand Forks, ND (United States)
It has been established through analyzing by-product ash samples at full-scale utility boilers that trace elements partition into different ash particle-size ranges. Partitioning of specific trace element species greatly impacts health risks and the selection of control technologies; for example, some hazardous trace element species associate, or partition, with particulate and can be removed from stack flue gas with conventional control technologies. Research was conducted to examine the fundamental transformation and partitioning of selected trace elements during coal combustion using bench- and intermediate-scale combustion test equipment. Several lignites, one bituminous Pittsburgh No. 8 coal, and one Powder River Basin (PRB) subbituminous coal were analyzed for arsenic (As), nickel (Ni), lead (Pb), chromium (Cr), selenium (Se), and mercury (Hg). Extractive sampling of flue gas particulate and vapor was performed, and the samples were analyzed for trace elements. Combustion ash collected in a five-stage multicyclone revealed evidence for condensation and possibly chemisorption as mechanisms for the particulate association of As, Cr, Pb, Ni, and less significantly Se. Impacts on Hg are difficult to determine indirectly because of unsolved accuracy issues pertaining to sampling methods. The implications of the results from this work to date are that conventional control technologies being used in coal combustion systems today, such as electrostatic precipitators and baghouses, which can remove up to 99% of supermicron particulate, could remove substantial quantities of As, Cr, Ni, and Pb. More volatile phases of Hg and Se need more specific attention to devise effective control methods.
- OSTI ID:
- 490358
- Report Number(s):
- CONF-970310--
- Country of Publication:
- United States
- Language:
- English
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