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Title: REDUCTION OF INHERENT MERCURY EMISSIONS IN PC COMBUSTION

Abstract

Mercury emission compliance is one of the major potential challenges raised by the 1990 Clean Air Act Amendments. Simple ways of controlling emissions have not been identified. The variability in the field data suggests that inherent mercury emissions may be reduced if the source of this inherent capture can be identified and controlled. The key mechanisms appear to involve the oxidation of the mercury to Hg{sup 2}, generally producing the more reactive HgCl{sub 2}, followed by its capture by certain components of the fly ash or char. This research focuses on identifying the rate-limiting steps associated with the oxidation step. Work in this reporting period focused on the development of oxidation data as a function of temperature and HCl concentration. The temperature range was 800-1200 C. The results show a lower level of oxidation than indicated by the earlier data of Hall et al. (1991). One possible reason for this discrepancy was the preheating of the HCl stream in the Hall experiment, leading to the partial decomposition of the HCl into reactive species. In the present experiments, the HCl was injected as a cold stream. The measured oxidation at these conditions was substantially above that predicted by equilibrium, indicating themore » dominance of finite rate chemistry. This is to be explored in subsequent work.« less

Authors:
; ;
Publication Date:
Research Org.:
Federal Energy Technology Center Morgantown (FETC-MGN), Morgantown, WV (United States); Federal Energy Technology Center Pittsburgh (FETC-PGH), Pittsburgh, PA (United States)
Sponsoring Org.:
US Department of Energy (US)
OSTI Identifier:
775017
Report Number(s):
DE-FG22-95PC95216-05
TRN: AH200110%%33
DOE Contract Number:  
FG22-95PC95216
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 19 Aug 1998
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; COMBUSTION; FLY ASH; HEAT TREATMENTS; MERCURY; OXIDATION; AIR POLLUTION ABATEMENT; COAL; PULVERIZED FUELS; MERCURY CHLORIDES; CHEMICAL REACTION KINETICS

Citation Formats

Kramlich, John C, Sliger, Rebecca N, and Going, David J. REDUCTION OF INHERENT MERCURY EMISSIONS IN PC COMBUSTION. United States: N. p., 1998. Web. doi:10.2172/775017.
Kramlich, John C, Sliger, Rebecca N, & Going, David J. REDUCTION OF INHERENT MERCURY EMISSIONS IN PC COMBUSTION. United States. https://doi.org/10.2172/775017
Kramlich, John C, Sliger, Rebecca N, and Going, David J. 1998. "REDUCTION OF INHERENT MERCURY EMISSIONS IN PC COMBUSTION". United States. https://doi.org/10.2172/775017. https://www.osti.gov/servlets/purl/775017.
@article{osti_775017,
title = {REDUCTION OF INHERENT MERCURY EMISSIONS IN PC COMBUSTION},
author = {Kramlich, John C and Sliger, Rebecca N and Going, David J},
abstractNote = {Mercury emission compliance is one of the major potential challenges raised by the 1990 Clean Air Act Amendments. Simple ways of controlling emissions have not been identified. The variability in the field data suggests that inherent mercury emissions may be reduced if the source of this inherent capture can be identified and controlled. The key mechanisms appear to involve the oxidation of the mercury to Hg{sup 2}, generally producing the more reactive HgCl{sub 2}, followed by its capture by certain components of the fly ash or char. This research focuses on identifying the rate-limiting steps associated with the oxidation step. Work in this reporting period focused on the development of oxidation data as a function of temperature and HCl concentration. The temperature range was 800-1200 C. The results show a lower level of oxidation than indicated by the earlier data of Hall et al. (1991). One possible reason for this discrepancy was the preheating of the HCl stream in the Hall experiment, leading to the partial decomposition of the HCl into reactive species. In the present experiments, the HCl was injected as a cold stream. The measured oxidation at these conditions was substantially above that predicted by equilibrium, indicating the dominance of finite rate chemistry. This is to be explored in subsequent work.},
doi = {10.2172/775017},
url = {https://www.osti.gov/biblio/775017}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Aug 19 00:00:00 EDT 1998},
month = {Wed Aug 19 00:00:00 EDT 1998}
}