Combustion of single particles from sewage sludge/pine sawdust and sewage sludge/bituminous coal under oxy-fuel conditions with steam addition

Kai Lei; Rui Zhang; Buqing Ye; Jin Cao; Dong Liu

doi:10.1016/j.wasman.2019.09.034

Combustion of single particles from sewage sludge/pine sawdust and sewage sludge/bituminous coal under oxy-fuel conditions with steam addition

Waste Manag. 2020 Jan 1:101:1-8. doi: 10.1016/j.wasman.2019.09.034. Epub 2019 Oct 1.

Authors

Kai Lei¹, Rui Zhang², Buqing Ye¹, Jin Cao¹, Dong Liu³

Affiliations

¹ MIIT Key Laboratory of Thermal Control of Electronic Equipment, School of Energy and Power Engineering, Nanjing University of Science and Technology, Nanjing 210094, PR China; Advanced Combustion Laboratory, School of Energy and Power Engineering, Nanjing University of Science and Technology, Nanjing 210094, PR China.
² MIIT Key Laboratory of Thermal Control of Electronic Equipment, School of Energy and Power Engineering, Nanjing University of Science and Technology, Nanjing 210094, PR China; Advanced Combustion Laboratory, School of Energy and Power Engineering, Nanjing University of Science and Technology, Nanjing 210094, PR China. Electronic address: zhangrui@njust.edu.cn.
³ MIIT Key Laboratory of Thermal Control of Electronic Equipment, School of Energy and Power Engineering, Nanjing University of Science and Technology, Nanjing 210094, PR China; Advanced Combustion Laboratory, School of Energy and Power Engineering, Nanjing University of Science and Technology, Nanjing 210094, PR China. Electronic address: dongliu@njust.edu.cn.

PMID: 31585272
DOI: 10.1016/j.wasman.2019.09.034

Abstract

Co-pelletization of sewage sludge (SS) and conventional fuels for combustion is considered to be a feasible SS disposal method. Oxy-fuel combustion is recognized as a promising technology to reduce the emission of CO₂. In practical applications, the combustion atmosphere in oxy-fuel boiler is O₂/CO₂/H₂O, which is different from that in the conventional boiler (O₂/N₂). Therefore, the effects of gas composition on the combustion characteristics of boiler fuels should be both taken into consideration. In this work, the SS/pine sawdust (PS) and SS/bituminous coal (BC) blended fuel particles were prepared, and the single particle combustion experiments were conducted in O₂/N₂, O₂/CO₂ and O₂/CO₂/H₂O atmospheres. The influences of SS blending proportion and gas composition on combustion characteristics of fuel particles were analyzed. The results reveal that increasing the blending proportion of SS from 20 to 40 wt% decreases the ignition delay time, burnout time and combustion temperature. The substitution of N₂ by CO₂ increases the ignition delay time and burnout time, while decreases the combustion temperature. Replacing CO₂ by 10 vol%, 20 vol% and 30 vol% H₂O decreases the ignition delay time and burnout time, while increases the combustion temperature.

Keywords: Bituminous coal; O(2)/CO(2)/H(2)O; Pine sawdust; Sewage sludge; Single particle combustion.

MeSH terms

Atmosphere
Coal*
Pinus*
Sewage
Steam

Substances

Coal
Sewage
Steam