Advanced coolside desulfurization process

Journal Article · Sat May 01 04:00:00 EDT 1993 · Environmental Progress; (United States)

DOI:https://doi.org/10.1002/ep.670120211· OSTI ID:7054931

Stouffer, M R; Rosenhoover, W A; Withum, J A ^[1]

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1. CONSOL Inc., Library, PA (United States)

This paper describes a dry sorbent injection SO[sub 2] abatement process with the potential to significantly enhance desulfurization performance over that of existing in-duct injection technology such as the Coolside process. The Advanced Coolside process was developed by CONSOL Inc. and is being tested in a pilot-scale project, partially funded by the US Department of Energy (DOE). The goals of this process development effort are to increase the applicability of sorbent injection technology as a compliance option for coal-fired boilers for the 1990 Clean Air Act Amendments and to reduce total process SO[sub 2] control costs. Specific performance objectives are to achieve 90% SO[sub 2] removal and 60% sorbent utilization efficiency, while retaining the low-capital cost and retrofit advantages inherent to in-duct sorbent injection technology. The Advanced Coolside process concept involves flue gas humidification to near the adiabatic saturation point combined with fly ash removal using a gas/liquid contacting device, followed by injection of a sorbent into the highly humid flue gas with collection by the existing particulate collector. High SO[sub 2] removal and sorbent utilization efficiency are possible with hydrated lime when the flue gas is nearly saturated with moisture. Sorbent utilization is further improved by recycle, and the potential for improvement by the use of recycle is increased with removal of the fly ash before sorbent injection. Further, testing indicates that pre-treatment of the recycle sorbent before reinjection can improve process performance. Because flue gas is humidified completely before sorbent injection, the existing duct configuration may not limit process retrofit potential. The heat of reaction between SO[sub 2] and Ca(OH)[sub 2] heats the flue gas before the existing particulate collector. Current pilot test data indicate that the Advanced Coolside process performance objectives are achievable. 13 refs., 9 figs., 2 tabs.

• DOE Contract Number: AC22-91PC90360
• OSTI ID: 7054931
• Journal Information: Environmental Progress; (United States), Journal Name: Environmental Progress; (United States) Vol. 12:2; ISSN 0278-4491; ISSN ENVPDI
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010800* -- Coal
Lignite
& Peat-- Waste Management
CHEMICAL REACTIONS
DESULFURIZATION
FEASIBILITY STUDIES
FLUE GAS
GASEOUS WASTES
SORBENT INJECTION PROCESSES
WASTES