PISCES field chemical emissions monitoring project: Site 125 emissions report. Final report

Technical Report · Fri Dec 01 04:00:00 EST 1995

OSTI ID:257373

This report describes the results of a project to measure certain chemical emissions at the coal-fired electricity generating plant known as EPRI PISCES Site 125. The three units of Site 125 are fired with an Eastern bituminous coal. Unit 1 was the subject of this investigation; like the other two units, Unit 1 operates with a boiler of the cyclone type, and it controls emissions with a cold-side electrostatic precipitator (ESP). Units 1 and 2 also operate with limestone-fed venturi wet scrubbers to control sulfur dioxide emissions. The scrubbers associated with Units 1 and 2 employ forced oxidation to convert calcium sulfite to gypsum. The emission measurements were concerned with the following components of the flue gas: trace metals and acid gases. Water and various solids in process streams (coal, bottom ash, ESP-collected ash, limestone, and scrubber discharge) were also sampled and analyzed for trace metals and the nonmetals that produce the acid gases. Analyses of flue gas streams at the inlet of the ESP and the stack indicate that most of the trace metals are controlled at least to the same degree as the total particulate matter -- about 95%. Two trace metals not controlled to this degree occur to a significant degree in the vapor state; these elements are Hg and Se. A substantial fraction of nearly every metal is discharged with the bottom ash or slag, which represents roughly 70% of the mass of ash in the coal. Again, Hg and Se are exceptions. The acid gases HF, HCl, and SO{sub 2} are effectively removed in the scrubber. A fourth acid gas considered, phosphoric acid, is controlled by virtue of its capture in the bottom ash and fly ash.

• Research Organization: Electric Power Research Inst., Palo Alto, CA (United States); Southern Research Inst., Birmingham, AL (United States)
• Sponsoring Organization: Electric Power Research Inst., Palo Alto, CA (United States)
• OSTI ID: 257373
• Report Number(s): EPRI-TR--105643
• Country of Publication: United States
• Language: English

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01 COAL, LIGNITE, AND PEAT
20 FOSSIL-FUELED POWER PLANTS
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ARSENIC
ASHES
BARIUM
BERYLLIUM
BITUMINOUS COAL
CADMIUM
CHROMIUM
COBALT
COMBUSTION
COMPILED DATA
CYCLONE COMBUSTORS
ELECTROSTATIC PRECIPITATORS
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HYDROCHLORIC ACID
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TRACE AMOUNTS
VANADIUM