Flue gas conditioning for improved particle collection in electrostatic precipitators

Technical Report · Fri Jan 15 04:00:00 EST 1993

DOI:https://doi.org/10.2172/7045530· OSTI ID:7045530

Durham, M D

It is concluded that the laboratory tests should be conducted at high levels of SO[sub 3] such that the resulting resistivity is in the range of 10[sup 7]--10[sup 8] ohm-cm. There are several reasons leading to this conclusion. At SO[sub 3] concentrations of 30 ppM and greater, the curves for both dew point and resistivity are relatively flat so that changes in gas phase SO[sub 3] will have minimal impact on particle characteristics. In addition, the electrostatic forces are relatively flat in this range so that changes in flue gas conditions will that result in a change in resistivity by up to two orders of magnitude will have little effect on the magnitude of reentrainment. Finally, at the very low resistivity conditions, reentrainment will be the highest. Since the purpose of the laboratory resistivity tests is to determine the relative ability of the various additives to reduce resistivity, the greater the reentrainment, the easier it will be to measure an improvement. Tests were conducted by first operating at baseline conditions with no additives and then repeating the test with additives. The data collected during each test includes the resistivity of the material, thickness of the collected dust layer, and subjective indications of the dust characteristics. The candidate additives were from the polymer group, cellulose derivatives, starches and gums, and oils. No waxes or synthetic compounds have been tested to date in the laboratory apparatus. Of the seventeen additives tested, eight appeared to have a positive impact on either the ash layer thickness or the physical appearance of the dust layer. Excessive deposits on the discharge electrode resulted during injection of some of the additives. Three of the additives resulted in significant deposits in the injection chamber. The build up on the electrode was interpreted as a positive indicator of increase particle adhesion. The initial observations and comments for the eight additives are listed in Table 1.

• Research Organization: ADA Technologies, Inc., Englewood, CO (United States)
• Sponsoring Organization: DOE; USDOE, Washington, DC (United States)
• DOE Contract Number: AC22-91PC90364
• OSTI ID: 7045530
• Report Number(s): DOE/PC/90364-T5; ON: DE93008095
• Country of Publication: United States
• Language: English

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20 FOSSIL-FUELED POWER PLANTS
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ADDITIVES
AEROSOL WASTES
ASHES
ATOMIZATION
COMBUSTION PRODUCTS
DOCUMENT TYPES
EFFICIENCY
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTROSTATIC PRECIPITATORS
EQUIPMENT
FLUE GAS
FLY ASH
GASEOUS WASTES
GUMS
OILS
ORGANIC COMPOUNDS
OTHER ORGANIC COMPOUNDS
PERFORMANCE TESTING
PHYSICAL PROPERTIES
POLLUTION CONTROL EQUIPMENT
POLYMERS
PROGRESS REPORT
RESIDUES
TESTING
WASTES