Air quality assessment and control, Task 2.0. Semi-annual report, March 1--June 30, 1993
Emissions of fine particles are of concern because these particles can be deposited in the lower respiratory system through normal breathing. The potential problem is further compounded because hazardous trace elements, such as selenium and arsenic, are known to be concentrated on such fine particles. Control device removal efficiency is lowest for respirable particles, so the potentially most hazardous particles from coal combustion are collected with the lowest removal efficiency. Therefore, a current need exists to develop superior, but economical, methods to control emissions of air toxic particulate matter. One approach is to model the relationships between the cohesive properties of fly ash and particulate collector performance in electrostatic precipitators (ESPs) and fabric filters. In ESPs, a balance between good dust release and minimum redispersion must be achieved for optimum ESP fine-particle collection efficiency. To achieve high fine-particle collection efficiency with fabric filters, the large pores in the fabric must be adequately bridged, and reentrainment must be kept to a minimum while still allowing for adequate dust cake release. However, the defining relationships between cohesive dust properties and particulate collector performance have not been adequately developed. Therefore, the goal of the Fine Particulate Control project is the development of methods to measure the cohesive strength and reentrainment potential of fly ashes and to model emissions of fine particles based on these measurements. A long-term project goal is to develop the models to the point where they can be used to help design particulate control devices for the lowest level of fine-particle emissions at a reasonable cost.
- Research Organization:
- Univ. of North Dakota, Grand Forks, ND (United States). Energy and Environmental Research Center
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- FC21-93MC30097
- OSTI ID:
- 10107744
- Report Number(s):
- DOE/MC/30097-3516; ON: DE94000046; BR: AA0510000/AA0515000
- Resource Relation:
- Other Information: PBD: Jul 1993
- Country of Publication:
- United States
- Language:
- English
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