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research-article

Effects of air flowrate on the combustion and emissions of blended corn straw and pinewood wastes

[+] Author and Article Information
Xiaoxiao Meng

PhD Candidate, School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, PR China; Department of Mechanical and Industrial Engineering, 334 SN, Northeastern University, 360 Huntington Ave., Boston, MA 02116
mengxiaoxiaodream@gmail.com

Wei Zhou

PhD Candidate, School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, PR China
zhouweidream@gmail.com

Emad Rokni

PhD Candidate, Department of Mechanical and Industrial Engineering, 334 SN, Northeastern University, 360 Huntington Ave., Boston, MA 02116
rokni.e@husky.neu.edu

Honghua Zhao

Master Student, Heilongjiang Academy of Agricultural Sciences, Harbin 150049, PR China
11729425@qq.com

Rui Sun

Professor, School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, PR China
sunsr@hit.edu.cn

Yiannis Levendis

College of Engineering Distinguished Professor, ASME and SAE Fellow, Department of Mechanical and Industrial Engineering, 334 SN, Northeastern University, 360 Huntington Ave., Boston, MA 02116, Telephone: 617 373-3806
y.levendis@neu.edu

1Corresponding author.

ASME doi:10.1115/1.4042005 History: Received October 09, 2018; Revised November 07, 2018

Abstract

This research investigated the effects of the specific primary air flowrate (?air) on the combustion behavior of a 50-50 wt% blend of raw corn straw and raw pinewood wastes in a fixed-bed reactor. This parameter was varied in the range of 0.079-0.226 kg m-2s-1, which changed the overall combustion stoichiometry from air-lean (excess air coefficient ?=0.73) to air-rich (excess of coefficient ?=1.25) and affected the combustion efficiency, stability and emissions of hazardous pollutants. It was observed that by increasing ?air the ignition delay time first increased and then decreased, the average bed temperatures increased, both the average flame propagation rates and the burning rates increased, and the combustion efficiencies also increased. The emissions of CO as well as those of cumulative gas phase nitrogen compounds increased, the latter mostly because of increasing HCN, while those of NO were rather constant. The emissions of HCl decreased but those of other chlorine-containing species increased. The effect of ?air on conversion of sulfur to SO2 was minor. By considering all of the aforesaid factors, a mildly overall air-rich (fuel-lean) (?=1.04) operating condition can be suggested for corn-straw/pinewood burning fixed-bed grate-fired reactors.

Copyright (c) 2018 by ASME
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