Capture efficiency of coal/biomass co-combustion ash in an electrostatic field--颗粒学报PARTICUOLOGY

Lu, J., Fu, L., Li, X., & Eddings, E. (2018). Capture efficiency of coal/biomass co-combustion ash in an electrostatic field. Particuology, 40, 80-87. https://doi.org/10.1016/j.partic.2017.10.006

Capture efficiency of coal/biomass co-combustion ash in an electrostatic field

Jianyi Lu ^a *, Lili Fu ^a, Ximei Li ^a, Eric Eddings ^b

a School of Environmental Science and Engineering, North China Electric Power University, Baoding 071003, China
b Department of Chemical Engineering and Institute for Secure and Clean Energy, University of Utah, Salt Lake City 84112, USA

10.1016/j.partic.2017.10.006

Volume 40, October 2018, Pages 80-87

Received 17 July 2017, Revised 11 October 2017, Accepted 17 October 2017, Available online 9 February 2018, Version of Record 28 July 2018.

E-mail: lujianyi@tsinghua.org.cn

Highlights

• The ratio of ¹⁴C/¹²C in co-ash samples were used to identify the origin of each ash component.

• Co-ash could be efficiently captured using an electrostatic precipitator (ESP).

• Biomass addition assisted with the removal of both coal ash and biomass ash in ESP.

Abstract

Ash samples from corn stalk and coal co-fired at 0%, 5%, 10%, 15%, 20%, and 100% biomass were collected by a 4-stage wire-pipe type electrostatic precipitator (ESP), and the ratio of ¹⁴C/¹²C in ash samples from the 0%, 20%, and 100% co-firing scenarios were measured by an accelerator mass spectrometer. The differential capture efficiency in electrostatic fields for coal ash, coal/biomass co-combustion ash (co-ash), and pure biomass ash was studied separately based on the ratio ¹⁴C/¹²C. Other factors that may influence capture efficiency were analyzed, including microscopic morphology, resistivity, dust density, and particle size distribution. The results indicate that co-ash may be efficiently captured by ESP, while pure biomass ash could not. Co-ash capture was mainly concentrated in the first two electrostatic fields in the lab-scale ESP, and the overall capture efficiency exceeded 90%. Biomass addition decreased the resistivity of co-ash, and enhanced its surface adsorption capacity to form agglomerates, facilitating the capture of co-ash. The capture efficiency of coal ash in co-ash was higher than that of pure coal ash in the first electrostatic field of the ESP. Co-firing biomass can aid the removal of both coal ash and biomass ash when using an ESP.

Graphical abstract

Keywords

Biomass; Co-combustion ash (co-ash); Capture efficiency; Electrical field; ¹⁴C/¹²C

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