Treatment of blowdown from a coal preheater

Conference · Fri Jan 01 04:00:00 EST 1982 · Proc. Ind. Waste Conf.; (United States)

OSTI ID:5319233

Wu, Y C ^[1]; Skubak, J; Scholze, R; Chen, C Y

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1. Univ. of Pittsburgh, PA

A pulverized coal preheating facility is used to heat coal to 500/sup 0/F prior to coke oven charging. This system ultimately reduces coking time and enables a higher production rate as compared to conventional coking. This operation also has an ancillary effect of eliminating various transfer steps, because the coal is charged to the oven via pipeline. However, emissions from this type of coal preheating facility must be controlled. The facility uses a water venturi scrubber to clean the blowdown air stream, which contains fine particles of coal not collected in the cyclone recovery system. This scrubbing system, in alleviating an air emission problem, produces an aqueous effluent which is not acceptable for discharge. Normally the blowdown from the scrubbing system is discharged to a coke quenching sump. The water in this sump is pumped to the coke quench, and evaporated. Solids which settle to the bottom of the sump are removed regularly with a clam bucket. Unfortunately, the quench sump can overflow, whenever there is a pushing delay. As a consequence of these existing problems and projected regulations, it is important to understand whether this blowdown need be treated to allow direct discharge to natural rivers/streams. This study proceeded with testing to determine settling characteristics of the blowdown to obtain adequate data for engineering design of clarification facilities. In addition, the adsorption ability of activated carbon was studied as a polishing step in treatment. Of course, prior to the performance of these studies already mentioned, the general properties of the blowdown were first determined.

• OSTI ID: 5319233
• Report Number(s): CONF-810577-
• Conference Information: Journal Name: Proc. Ind. Waste Conf.; (United States) Journal Volume: 36
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010401 -- Coal & Coal Products-- Carbonization-- (-1987)
010800* -- Coal
Lignite
& Peat-- Waste Management
ACTIVATED CARBON
ADSORBENTS
ADSORPTION
BLOWDOWN
CARBON
COAL FINES
COKING PLANTS
ELEMENTS
EMISSION
EQUIPMENT
HEAT TREATMENTS
HYDROGEN COMPOUNDS
INDUSTRIAL PLANTS
LIQUID WASTES
MANAGEMENT
NONMETALS
OXYGEN COMPOUNDS
POLLUTION CONTROL EQUIPMENT
PROCESSING
SCRUBBERS
SORPTION
WASTE MANAGEMENT
WASTE PROCESSING
WASTE WATER
WASTES
WATER