Optimization of Secondary Air Injection in a Wood-Burning Cookstove: An Experimental Study

Caubel, Julien J.; Rapp, Vi H.; Chen, Sharon S.; Gadgil, Ashok J.

doi:10.1021/acs.est.7b05277

Title: Optimization of Secondary Air Injection in a Wood-Burning Cookstove: An Experimental Study

Journal Article · Mon Mar 19 00:00:00 EDT 2018 · Environmental Science and Technology

DOI:https://doi.org/10.1021/acs.est.7b05277· OSTI ID:1532311

^[1]; Rapp, Vi H. ^[2]; Chen, Sharon S. ^[2]; Gadgil, Ashok J. ^[3]

Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States)

Nearly 40% of the world's population regularly cooks on inefficient biomass stoves that emit harmful airborne pollutants, such as particulate matter (PM). Secondary air injection can significantly reduce PM mass emissions to mitigate the health and climate impacts associated with biomass cookstoves. However, secondary air injection can also increase the number of ultrafine particles emitted, which may be more harmful to health. This research investigates the effect of secondary air injection on the mass and size distribution of PM emitted during solid biomass combustion. An experimental wood-burning cookstove platform and parametric testing approach are presented to identify and optimize secondary air injection parameters that reduce PM and other harmful pollutants. Size-resolved measurements of PM emissions were collected and analyzed as a function of parametric stove design settings. The results show that PM emissions are highly sensitive to secondary air injection flow rate and velocity. Although increasing turbulent mixing (through increased velocity) can promote more complete combustion, increasing the total flow rate of secondary air may cause localized flame quenching that increases particle emissions. As a result, biomass cookstoves that implement secondary air injection should be carefully optimized and validated to ensure that PM emission reductions are achieved throughout the particle size range.

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Research Organization:: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Sustainable Transportation Office. Bioenergy Technologies Office

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1532311

Journal Information:: Environmental Science and Technology, Vol. 52, Issue 7; ISSN 0013-936X

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 26 works

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Pollutant Emissions from Improved Cookstoves of the Type Used in Sub-Saharan Africa Mitchell, E. J. S.; Ting, Y.; Allan, J. Taylor & Francis https://doi.org/10.6084/m9.figshare.8131895.v1	text	January 2019
Pollutant Emissions from Improved Cookstoves of the Type Used in Sub-Saharan Africa Mitchell, E. J. S.; Ting, Y.; Allan, J. Combustion Science and Technology https://doi.org/10.1080/00102202.2019.1614922	journal	May 2019
Pollutant Emissions from Improved Cookstoves of the Type Used in Sub-Saharan Africa Mitchell, E. J. S.; Ting, Y.; Allan, J. Figshare https://doi.org/10.6084/m9.figshare.8131895	text	January 2019

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