Flue gas conditioning for improved particle collection in electrostatic precipitators. Second topical report, Results of bench-scale screening of additives

Technical Report · Fri Aug 13 04:00:00 EDT 1993

DOI:https://doi.org/10.2172/10109330· OSTI ID:10109330

Durham, M D

ADA Technologies, Inc. (ADA) has completed the bench-scale testing phase of a program to evaluate additives that will improve the collection of fine particles in electrostatic precipitators (ESPs). A bench-scale ESP was installed at the Consolidation Coal Company (CONSOL) combustion research and development facility in Library, PA in order to conduct the evaluation. During a two-week test, four candidate additives were injected into the flue gas ahead of a 100 acfm ESP to determine the effect on fly ash collectability. Two additives were found to reduce the emissions from the ESP. Additives ``C`` and ``D`` performed better than initially anticipated -- reducing emissions initially by 17%. Emissions were reduced by 27% after the ESP was modified by the installation of baffles to minimize sneakage. In addition to the measured improvements in performance, no detrimental effects (i.e., electrode fouling) were observed in the operation of the ESP during the testing. The measures of success identified for the bench-scale phase of the program have been surpassed. Since the additives will affect only non-rapping reentrainment particle losses, it is expected that an even greater improvement in particle collection will be observed in larger-scale ESPs. Therefore, positive results are anticipated during the pilot-scale phase of the program and during a future full-scale demonstration test. A preliminary economic analysis was performed to evaluate the cost of the additive process and to compare its costs against alternative means for reducing emissions from ESPs. The results show that conditioning with additive C at a rate of 0.05% (wt. additive to wt. fly ash) is much less expensive than adding new ESP capacity, and more cost competitive than existing chemical conditioning processes. Preliminary chemical analysis of conditioned fly ash shows that it passes the Toxicity Characteristic Leaching Procedure criteria.

• Research Organization: ADA Technologies, Inc., Englewood, CO (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: AC22-91PC90364
• OSTI ID: 10109330
• Report Number(s): DOE/PC/90364--T7; ADA--4300-93-T2; ON: DE94004547; BR: AA0505000
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010800
20 FOSSIL-FUELED POWER PLANTS
200202
54 ENVIRONMENTAL SCIENCES
540120
ADDITIVES
AIR POLLUTION CONTROL
BENCH-SCALE EXPERIMENTS
CHEMICALS MONITORING AND TRANSPORT
CLEANING
ELECTROSTATIC PRECIPITATORS
EXPERIMENTAL DATA
FLUE GAS
FLY ASH
NOXIOUS GAS AND PARTICULATE EMISSIONS
PARTICULATES
PROGRESS REPORT
REMOVAL
WASTE MANAGEMENT