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Title: FUNDAMENTAL INVESTIGATION OF FUEL TRANSFORMATIONS IN PULVERIZED COAL COMBUSTION AND GASIFICATION TECHNOLOGIES

Abstract

The goal of this project is to carry out the necessary experiments and analyses to extend leading submodels of coal transformations to the new conditions anticipated in next-generation energy technologies. During the first two projects years, significant progress was made on most of the tasks, as described in detail in the two previous annual reports. In the current third annual report, we report in detail on the BYU task on the properties and intrinsic reactivities of chars prepared at high-pressure. A flat-flame burner was used in a high pressure laminar flow facility to conduct high temperature, high heating rate coal pyrolysis experiments. Heating rates were approximately 10{sup 5} K/s, which is higher than in conventional drop tube experiments. Char samples from a Pitt No.8 coal and lignite were collected at 1300 C at 1, 6, 10, and 15 atm. Swelling ratios of the lignite were less than 1.0, and only about 1.3 for the Pitt No.8 coal. All coals showed slight increases in swelling behavior as pressure increased. The swelling behavior observed for the Pitt No.8 coal at each pressure was lower than reported in high pressure drop tube experiments, indicating the effect of heating rate on particle swelling. Thismore » heating rate effect was similar to that observed previously at atmospheric pressure. SEM photos revealed that bituminous coal has large physical structure transformations, with popped bubbles due to the high heating rate. TGA char oxidation reactivities were measured at the same total pressure as the char preparation pressure. The general trend was that the TGA reactivity on a gram per gram available basis decreased for both Pitt No.8 and Knife River lignite coal chars with increasing char formation pressure. The Pitt No.8 char intrinsic activation energy and oxygen reaction order remained relatively constant with increasing pressure. This new data provides some of the only information available on the morphology, structure, and reactivity of chars prepared in high pressure flames.« less

Authors:
; ; ;
Publication Date:
Research Org.:
Brown University (US)
Sponsoring Org.:
(US)
OSTI Identifier:
822879
DOE Contract Number:  
FG26-00NT40815
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 1 Jan 2004
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; ACTIVATION ENERGY; ATMOSPHERIC PRESSURE; BITUMINOUS COAL; CHARS; COAL; COMBUSTION; GASIFICATION; HEATING RATE; LAMINAR FLOW; LIGNITE; MORPHOLOGY; PYROLYSIS; RESERVOIR PRESSURE; TRANSFORMATIONS

Citation Formats

Hurt, Robert, Calo, Joseph, Fletcher, Thomas, and Sayre, Alan. FUNDAMENTAL INVESTIGATION OF FUEL TRANSFORMATIONS IN PULVERIZED COAL COMBUSTION AND GASIFICATION TECHNOLOGIES. United States: N. p., 2004. Web. doi:10.2172/822879.
Hurt, Robert, Calo, Joseph, Fletcher, Thomas, & Sayre, Alan. FUNDAMENTAL INVESTIGATION OF FUEL TRANSFORMATIONS IN PULVERIZED COAL COMBUSTION AND GASIFICATION TECHNOLOGIES. United States. https://doi.org/10.2172/822879
Hurt, Robert, Calo, Joseph, Fletcher, Thomas, and Sayre, Alan. 2004. "FUNDAMENTAL INVESTIGATION OF FUEL TRANSFORMATIONS IN PULVERIZED COAL COMBUSTION AND GASIFICATION TECHNOLOGIES". United States. https://doi.org/10.2172/822879. https://www.osti.gov/servlets/purl/822879.
@article{osti_822879,
title = {FUNDAMENTAL INVESTIGATION OF FUEL TRANSFORMATIONS IN PULVERIZED COAL COMBUSTION AND GASIFICATION TECHNOLOGIES},
author = {Hurt, Robert and Calo, Joseph and Fletcher, Thomas and Sayre, Alan},
abstractNote = {The goal of this project is to carry out the necessary experiments and analyses to extend leading submodels of coal transformations to the new conditions anticipated in next-generation energy technologies. During the first two projects years, significant progress was made on most of the tasks, as described in detail in the two previous annual reports. In the current third annual report, we report in detail on the BYU task on the properties and intrinsic reactivities of chars prepared at high-pressure. A flat-flame burner was used in a high pressure laminar flow facility to conduct high temperature, high heating rate coal pyrolysis experiments. Heating rates were approximately 10{sup 5} K/s, which is higher than in conventional drop tube experiments. Char samples from a Pitt No.8 coal and lignite were collected at 1300 C at 1, 6, 10, and 15 atm. Swelling ratios of the lignite were less than 1.0, and only about 1.3 for the Pitt No.8 coal. All coals showed slight increases in swelling behavior as pressure increased. The swelling behavior observed for the Pitt No.8 coal at each pressure was lower than reported in high pressure drop tube experiments, indicating the effect of heating rate on particle swelling. This heating rate effect was similar to that observed previously at atmospheric pressure. SEM photos revealed that bituminous coal has large physical structure transformations, with popped bubbles due to the high heating rate. TGA char oxidation reactivities were measured at the same total pressure as the char preparation pressure. The general trend was that the TGA reactivity on a gram per gram available basis decreased for both Pitt No.8 and Knife River lignite coal chars with increasing char formation pressure. The Pitt No.8 char intrinsic activation energy and oxygen reaction order remained relatively constant with increasing pressure. This new data provides some of the only information available on the morphology, structure, and reactivity of chars prepared in high pressure flames.},
doi = {10.2172/822879},
url = {https://www.osti.gov/biblio/822879}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Jan 01 00:00:00 EST 2004},
month = {Thu Jan 01 00:00:00 EST 2004}
}