skip to main content

Title: Fundamental mechanisms in flue gas conditioning. Final report

The US Department of Energy`s Pittsburgh Energy Technology Center (DOE/PETC) initiated this project as part of a program to study the control of fine particles from coal combustion. Our project focus was flue gas conditioning. Various conditioning processes have lowered operating costs and increased collection efficiency at utility particulate control devices. By improving fine particle collection, flue gas conditioning also helps to control the emission of toxic metals, which are concentrated in the fine particle fraction. By combining a review of pertinent literature, laboratory characterization of a variety of fine powders and ashes, pilot-scale studies of conditioning mechanisms, and field experiences, Southern Research Institute has been able to describe many of the key processes that account for the effects that conditioning can have on fine-particle collection. The overall goal of this research project was to explain the mechanisms by which various flue gas conditioning processes alter the performance of particulate control devices. Conditioning involves the modification of one or more of the parameters that determine the magnitude of the forces acting on the fly ash particles. Resistivity, chemistry, cohesivity, size distribution, and particle morphology are among the basic properties of fly ash that significantly influence fine particle collection. Modifications ofmore » particulate properties can result in improved or degraded control device performance. These modifications can be caused by (1) changes to the process design or operation that affect properties of the flue gas, (2) addition of particulate matter such as flue-gas desulfurization sorbents to the process effluent stream, (3) injection of reactive gases or liquids into the flue gas. We recommend that humidification be seriously considered as a flue gas conditioning option. 80 refs., 69 figs., 23 tabs.« less
Authors:
; ;
Publication Date:
OSTI Identifier:
220578
Report Number(s):
DOE/PC/90365--T20; SRI-ENV--96-146-7375-F
ON: DE96009605
DOE Contract Number:
AC22-91PC90365
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 20 Mar 1996
Research Org:
Southern Research Inst., Birmingham, AL (United States)
Sponsoring Org:
USDOE, Washington, DC (United States)
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; FLY ASH; AIR POLLUTION CONTROL; PARTICULATES; METALS; EMISSION; FLUE GAS; HUMIDITY CONTROL; ADSORBENTS; BINARY MIXTURES; FABRIC FILTERS; ELECTROSTATIC PRECIPITATORS; PROGRESS REPORT