PM<sub>10</sub> emissions from industrial coal-fired chain-grate boilers

doi:10.1007/s11783-017-0966-y

Front. Environ. Sci. Eng.

2017, Vol. 11

Issue (6) : 18 https://doi.org/10.1007/s11783-017-0966-y

RESEARCH ARTICLE

PM₁₀ emissions from industrial coal-fired chain-grate boilers

Xinghua Li¹(

), Junzan Han¹, Lei Duan²

¹. School of Space and Environment, Beihang University, Beijing 100191, China
². School of Environment, Tsinghua University, Beijing 100084, China

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Abstract

PM in submicron mode emitted from raw coal burning contribute to 33 % of PM₁₀.

PM in submicron mode from briquette coal burning contribute to 86 % of PM₁₀.

Collection efficiency of muticlones and scrubbers is 34% for submicron particle.

Peak of submicron mode in normal operation period is larger than start-up period.

Industrial coal-fired boiler is an important air pollutant emission source in China. The chain-grate boiler is the most extensively used type of industrial coal-fired boiler. An electrical low-pressure impactor, and a Dekati^® Low Pressure Impactor were applied to determine mass and number size distributions of PM₁₀ at the inlet and the outlet of the particulate emission control devices at six coal-fired chain-grate boilers. The mass size distribution of PM₁₀ generated from coal-fired chain-grate boilers generally displays a bimodal distribution that contains a submicron mode and a coarse mode. The PM in the submicron mode for burning with raw coal contributes to 33%±10 % of PM₁₀ emissions, much higher than those for pulverized boilers. And the PM in the submicron mode for burning with briquette contributes up to 86 % of PM₁₀ emissions. Multiclones and scrubbers are not efficient for controlling PM₁₀ emission. Their average collection efficiencies for sub-micron particle and super-micron particle are 34% and 78%, respectively. Operating conditions of industrial steam boilers have influence on PM generation. Peak of the submicron mode during normal operation period is larger than the start-up period.

Keywords coal-fired chain-grate boiler PM₁₀ size distribution particulate emission control devices size-dependent collection efficiency

Corresponding Author(s): Xinghua Li

Issue Date: 12 July 2017

Cite this article:

Xinghua Li,Junzan Han,Lei Duan. PM₁₀ emissions from industrial coal-fired chain-grate boilers[J]. Front. Environ. Sci. Eng., 2017, 11(6): 18.

URL:

https://academic.hep.com.cn/fese/EN/10.1007/s11783-017-0966-y
https://academic.hep.com.cn/fese/EN/Y2017/V11/I6/18

Tab.1 Description of tested industrial coal-fired chain-grate boilers

Fig.1 Sampling system (a) ELPI and (b) LPI

Fig.2 Mass (a) and number (b) size distributions of PM₁₀ at the inlet of PECDs

Fig.3 Contributions of PM in the submicron mode to PM₁₀ from this study and previous studies from pulverized boilers

Fig.4 Mass (a) and number (b) size distributions of PM₁₀ at the outlet of PECDs

Fig.5 Size-dependent collection efficiencies of PM₁₀ by various PECDs

Fig.6 PM_2.5 concentration variation from the start-up to the normal operation of the boiler

Fig.7 PM_2.5 number size distributions variation during the start-up and the normal operation periods of the boiler

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