Combustion behaviors of lignin-lean black liquor and lignin
For kraft pulp mills that have thermally limited recovery boilers, lignin removal from black liquor has become an attractive option for increasing pulp production by allowing more black liquor to be processed through the boiler. This study systematically examined the combustion characteristics of li...
Published in: | TAPPI Journal |
---|---|
Main Authors: | , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
TAPPI Press
2015
|
Subjects: | |
Online Access: | http://hdl.handle.net/1807/97452 https://doi.org/10.32964/tj14.7.451 |
id |
ftunivtoronto:oai:localhost:1807/97452 |
---|---|
record_format |
openpolar |
spelling |
ftunivtoronto:oai:localhost:1807/97452 2023-05-15T17:54:51+02:00 Combustion behaviors of lignin-lean black liquor and lignin Zhao, Liming Tran, Honghi Maki, Kristen 2015-07 http://hdl.handle.net/1807/97452 https://doi.org/10.32964/tj14.7.451 en_ca eng TAPPI Press Zhao, L., Tran, H., & Maki, K. (2015). Combustion behaviors of lignin-lean black liquor and lignin. TAPPI Journal, 14(7), 451–458. doi:10.32964/tj14.7.451 0734-1415 http://hdl.handle.net/1807/97452 doi:10.32964/tj14.7.451 Article 2015 ftunivtoronto https://doi.org/10.32964/tj14.7.451 2020-06-17T12:27:35Z For kraft pulp mills that have thermally limited recovery boilers, lignin removal from black liquor has become an attractive option for increasing pulp production by allowing more black liquor to be processed through the boiler. This study systematically examined the combustion characteristics of lignin-lean black liquor and precipitated lignin from three kraft mills using a thermogravimetric combustor. The results confirm that adding lignin-lean black liquor to its original black liquor decreased the heating value and the degree of swelling of the mixed liquor. The effect on liquor swelling, however, was insignificant for mixed liquors that contained less than 20 wt% of lignin-lean liquor. As with other biofuels, the combustion of precipitated lignin was found to occur through three main stages: drying, volatile burning, and char burning. During the volatile burning stage, hardwood lignin swelled significantly, softwood lignin did not swell much, and mixed hardwood and softwood lignin was somewhere in between. Although the char content in lignin was about half of the volatile content, it took 10 times longer for the char to burn compared to the volatiles. This work was conducted as part of the “Increasing Energy and Chemical Recovery Efficiency in the Kraft Process - III” research program, jointly supported by the Natural Sciences and Engineering Research Council of Canada (NSERC) and a consortium of the following companies: Andritz, AV Nacka - wic, Babcock & Wilcox, Boise, Carter Holt Harvey, Celulose Nipo-Brasileira, Clyde-Bergemann, DMI Peace River Pulp, El - dorado, ERCO Worldwide, Fibria, FPInnovations, Internation - al Paper, Irving Pulp & Paper, Kiln Flame Systems, Klabin, MeadWestvaco, StoraEnso, Suzano, Tembec, Tolko Industries, and Valmet. Article in Journal/Newspaper Peace River University of Toronto: Research Repository T-Space Canada Nacka ENVELOPE(11.833,11.833,79.717,79.717) Wilcox ENVELOPE(-66.933,-66.933,-67.949,-67.949) TAPPI Journal 14 7 451 458 |
institution |
Open Polar |
collection |
University of Toronto: Research Repository T-Space |
op_collection_id |
ftunivtoronto |
language |
English |
description |
For kraft pulp mills that have thermally limited recovery boilers, lignin removal from black liquor has become an attractive option for increasing pulp production by allowing more black liquor to be processed through the boiler. This study systematically examined the combustion characteristics of lignin-lean black liquor and precipitated lignin from three kraft mills using a thermogravimetric combustor. The results confirm that adding lignin-lean black liquor to its original black liquor decreased the heating value and the degree of swelling of the mixed liquor. The effect on liquor swelling, however, was insignificant for mixed liquors that contained less than 20 wt% of lignin-lean liquor. As with other biofuels, the combustion of precipitated lignin was found to occur through three main stages: drying, volatile burning, and char burning. During the volatile burning stage, hardwood lignin swelled significantly, softwood lignin did not swell much, and mixed hardwood and softwood lignin was somewhere in between. Although the char content in lignin was about half of the volatile content, it took 10 times longer for the char to burn compared to the volatiles. This work was conducted as part of the “Increasing Energy and Chemical Recovery Efficiency in the Kraft Process - III” research program, jointly supported by the Natural Sciences and Engineering Research Council of Canada (NSERC) and a consortium of the following companies: Andritz, AV Nacka - wic, Babcock & Wilcox, Boise, Carter Holt Harvey, Celulose Nipo-Brasileira, Clyde-Bergemann, DMI Peace River Pulp, El - dorado, ERCO Worldwide, Fibria, FPInnovations, Internation - al Paper, Irving Pulp & Paper, Kiln Flame Systems, Klabin, MeadWestvaco, StoraEnso, Suzano, Tembec, Tolko Industries, and Valmet. |
format |
Article in Journal/Newspaper |
author |
Zhao, Liming Tran, Honghi Maki, Kristen |
spellingShingle |
Zhao, Liming Tran, Honghi Maki, Kristen Combustion behaviors of lignin-lean black liquor and lignin |
author_facet |
Zhao, Liming Tran, Honghi Maki, Kristen |
author_sort |
Zhao, Liming |
title |
Combustion behaviors of lignin-lean black liquor and lignin |
title_short |
Combustion behaviors of lignin-lean black liquor and lignin |
title_full |
Combustion behaviors of lignin-lean black liquor and lignin |
title_fullStr |
Combustion behaviors of lignin-lean black liquor and lignin |
title_full_unstemmed |
Combustion behaviors of lignin-lean black liquor and lignin |
title_sort |
combustion behaviors of lignin-lean black liquor and lignin |
publisher |
TAPPI Press |
publishDate |
2015 |
url |
http://hdl.handle.net/1807/97452 https://doi.org/10.32964/tj14.7.451 |
long_lat |
ENVELOPE(11.833,11.833,79.717,79.717) ENVELOPE(-66.933,-66.933,-67.949,-67.949) |
geographic |
Canada Nacka Wilcox |
geographic_facet |
Canada Nacka Wilcox |
genre |
Peace River |
genre_facet |
Peace River |
op_relation |
Zhao, L., Tran, H., & Maki, K. (2015). Combustion behaviors of lignin-lean black liquor and lignin. TAPPI Journal, 14(7), 451–458. doi:10.32964/tj14.7.451 0734-1415 http://hdl.handle.net/1807/97452 doi:10.32964/tj14.7.451 |
op_doi |
https://doi.org/10.32964/tj14.7.451 |
container_title |
TAPPI Journal |
container_volume |
14 |
container_issue |
7 |
container_start_page |
451 |
op_container_end_page |
458 |
_version_ |
1766162704025780224 |