Using sorbents to control heavy metals and particulate matter emission during solid fuel combustion--颗粒学报PARTICUOLOGY

Yao, H., & Naruse, I. (2009). Using sorbents to control heavy metals and particulate matter emission during solid fuel combustion. Particuology, 7(6), 477–482. https://doi.org/10.1016/j.partic.2009.06.004

Using sorbents to control heavy metals and particulate matter emission during solid fuel combustion

Hong Yao ^a *, Ichiro Naruse ^b

a State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, China
b Department of Mechanical Science & Engineering, Nagoya University, Nagoya 464-8603, Japan

10.1016/j.partic.2009.06.004

Volume 7, Issue 6, December 2009, Pages 477-482

Received 23 December 2008, Revised 22 May 2009, Accepted 18 June 2009, Available online 18 November 2009.

E-mail: hyao@hust.edu.cn

Highlights

Abstract

Some of the heavy metals in coal and wastes vaporize during combustion, concentrate in fine particulates, and emit with the flue gas into the atmosphere, to produce adverse effect on environment and health. This study first investigates the fate of the heavy metal species, especially Pb, Cd and Cr, known as semi-volatile, in various flue gases, especially in the presence of HCl and SO₂, by chemical equilibrium calculation, in which, Si and Ca were proposed as base sorbent materials to capture Pb, Cd and Cr. Then Si- and Ca-based compounds as well as waste materials used as sorbents were optimized to capture the heavy metals. Finally, the optimal sorbent was tested in actual burning of dried sewage sludge as solid fuel, to evaluate the effectiveness of the sorbent. Calculated results show that Cl increases the volatility of most heavy metals, while SO₂ enhances formation of condensed phases. Among the sorbents tested, kaolin appears most efficient to capture Pb and Cd. For sludge combustion with kaolin addition, both Pb and Cd were shifted from sub-micron to macro-sized particles, and accompanied by considerable decrease of 0.1 μm particles.

Graphical abstract

Keywords

Combustion; Heavy metal; Particulate matter; Sorbent

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