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

Abstract

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 particlemore » size range.« less

Authors:
ORCiD logo [1];  [2];  [2];  [3]
  1. Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Bioenergy Technologies Office (EE-3B)
OSTI Identifier:
1532311
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Environmental Science and Technology
Additional Journal Information:
Journal Volume: 52; Journal Issue: 7; Journal ID: ISSN 0013-936X
Publisher:
American Chemical Society (ACS)
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES

Citation Formats

Caubel, Julien J., Rapp, Vi H., Chen, Sharon S., and Gadgil, Ashok J. Optimization of Secondary Air Injection in a Wood-Burning Cookstove: An Experimental Study. United States: N. p., 2018. Web. doi:10.1021/acs.est.7b05277.
Caubel, Julien J., Rapp, Vi H., Chen, Sharon S., & Gadgil, Ashok J. Optimization of Secondary Air Injection in a Wood-Burning Cookstove: An Experimental Study. United States. doi:10.1021/acs.est.7b05277.
Caubel, Julien J., Rapp, Vi H., Chen, Sharon S., and Gadgil, Ashok J. Mon . "Optimization of Secondary Air Injection in a Wood-Burning Cookstove: An Experimental Study". United States. doi:10.1021/acs.est.7b05277. https://www.osti.gov/servlets/purl/1532311.
@article{osti_1532311,
title = {Optimization of Secondary Air Injection in a Wood-Burning Cookstove: An Experimental Study},
author = {Caubel, Julien J. and Rapp, Vi H. and Chen, Sharon S. and Gadgil, Ashok J.},
abstractNote = {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.},
doi = {10.1021/acs.est.7b05277},
journal = {Environmental Science and Technology},
number = 7,
volume = 52,
place = {United States},
year = {2018},
month = {3}
}

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Works referencing / citing this record:

Pollutant Emissions from Improved Cookstoves of the Type Used in Sub-Saharan Africa
journal, May 2019