Operating parameters affecting the thermal performance of biomass boilers

This work was conducted as part of the research program In - creasing Energy and Chemical Recovery Efficiency in the Kraft Process—III, jointly supported by the Natural Sciences and Engineering Research Council of Canada (NSERC) and a consortium of the following companies: Andritz, AV Nacka - wic, B...

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Bibliographic Details
Published in:TAPPI Journal
Main Authors: Orang, Naz, Tran, Honghi, Jones, Andy, McCabe, F. Donald
Format: Article in Journal/Newspaper
Language:English
Published: TAPPI Press 2017
Subjects:
Canada
Nacka
Wilcox
Peace River
Online Access:http://hdl.handle.net/1807/97459
https://doi.org/10.32964/tj16.8.453
Description
Summary:This work was conducted as part of the research program In - creasing Energy and Chemical Recovery Efficiency in the Kraft Process—III, 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 Operating data of a bubbling fluidized bed (BFB) boiler and three stoker grate (SG) biomass boilers from different pulp mills were analyzed over a 2-year period. The results show that in all cases, the thermal perfor - mance decreases markedly from 5.5 to 4 lb steam/lb dry biomass as the feedstock moisture content increases from 40% to 60%. The BFB boiler had better thermal performance, although it operated in a higher moisture content range compared with the SG boilers. Multivariate analysis was also performed on one of the SG boilers to determine operating parameters that affect thermal performance. The results show that furnace temperature, oil flow rate, and induced draft fan current positively correlate with thermal performance, while the feedstock moisture content, total air flow, and excess oxygen (O 2 ) negatively correlate with thermal performance. This implies that when making mod - ifications to improve thermal performance, it is important to take into account correlations among various parame - ters. In some cases, one positively correlated parameter might cause an increase in a negatively correlated parame - ter. The net effect might be a decrease in thermal performance.

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