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Title: Characterization of a new Hencken burner with a transition from a reducing-to-oxidizing environment for fundamental coal studies

Abstract

In pulverized coal burners, coal particles usually transition from a locally reducing environment to an oxidizing environment. The locally reducing environment in the near-burner region is due to a dense region of coal particles undergoing devolatilization. Following this region, the particles move into an oxidizing environment. This “reducing-to-oxidizing” transition can influence combustion processes such as ignition, particulate formation, and char burnout. To understand these processes at a fundamental level, a system is required that mimics such a transition. Hence, we have developed and characterized a two-stage Hencken burner to evaluate the effect of the reducing-to-oxidizing transition and particle-to-particle interaction (which characterizes dense region of coal particles) on ignition and ultrafine aerosol formation. The two-stage Hencken burner allows coal particles to experience a reducing environment followed by a transition to an oxidizing environment. This work presents the results of the design and characterization of the new two-stage Hencken burner and its new coal feeder. In a unique approach to the operation of the flat-flame of the Hencken burner, the flame configurations are operated as either a normal flame or inverse flame. Gas temperatures and oxygen concentrations for the Hencken burner are measured in reducing-to-oxidizing and oxidizing environments. The results show thatmore » stable flames with well-controlled conditions, relatively uniform temperatures, and species concentrations can be achieved in both flame configurations. This new Hencken burner provides an effective system for evaluating the effect of the reducing-to-oxidizing transition and particle-to-particle interaction on early-stage processes of coal combustion such as ignition and ultrafine particle formation.« less

Authors:
ORCiD logo [1];  [2];  [1]; ORCiD logo [1];  [3];  [2];  [1]
  1. Department of Energy, Environmental and Chemical Engineering, Washington University in St. Louis, St. Louis, Missouri 63130, USA
  2. Department of Thermal Engineering, Tsinghua University, Beijing 100084, China
  3. Department of Energy, Environmental and Chemical Engineering, Washington University in St. Louis, St. Louis, Missouri 63130, USA; Department of Thermal Engineering, Xi’an Jiaotong University, Xi’an, Shaanxi 710049, China
Publication Date:
Research Org.:
Washington Univ., St. Louis, MO (United States)
Sponsoring Org.:
USDOE Office of Fossil Energy (FE)
OSTI Identifier:
1540132
Alternate Identifier(s):
OSTI ID: 1421563
Grant/Contract Number:  
FE0009702
Resource Type:
Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 89; Journal Issue: 2; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
Instruments & Instrumentation; Physics

Citation Formats

Adeosun, Adewale, Huang, Qian, Li, Tianxiang, Gopan, Akshay, Wang, Xuebin, Li, Shuiqing, and Axelbaum, Richard L. Characterization of a new Hencken burner with a transition from a reducing-to-oxidizing environment for fundamental coal studies. United States: N. p., 2018. Web. doi:10.1063/1.5006087.
Adeosun, Adewale, Huang, Qian, Li, Tianxiang, Gopan, Akshay, Wang, Xuebin, Li, Shuiqing, & Axelbaum, Richard L. Characterization of a new Hencken burner with a transition from a reducing-to-oxidizing environment for fundamental coal studies. United States. doi:10.1063/1.5006087.
Adeosun, Adewale, Huang, Qian, Li, Tianxiang, Gopan, Akshay, Wang, Xuebin, Li, Shuiqing, and Axelbaum, Richard L. Thu . "Characterization of a new Hencken burner with a transition from a reducing-to-oxidizing environment for fundamental coal studies". United States. doi:10.1063/1.5006087. https://www.osti.gov/servlets/purl/1540132.
@article{osti_1540132,
title = {Characterization of a new Hencken burner with a transition from a reducing-to-oxidizing environment for fundamental coal studies},
author = {Adeosun, Adewale and Huang, Qian and Li, Tianxiang and Gopan, Akshay and Wang, Xuebin and Li, Shuiqing and Axelbaum, Richard L.},
abstractNote = {In pulverized coal burners, coal particles usually transition from a locally reducing environment to an oxidizing environment. The locally reducing environment in the near-burner region is due to a dense region of coal particles undergoing devolatilization. Following this region, the particles move into an oxidizing environment. This “reducing-to-oxidizing” transition can influence combustion processes such as ignition, particulate formation, and char burnout. To understand these processes at a fundamental level, a system is required that mimics such a transition. Hence, we have developed and characterized a two-stage Hencken burner to evaluate the effect of the reducing-to-oxidizing transition and particle-to-particle interaction (which characterizes dense region of coal particles) on ignition and ultrafine aerosol formation. The two-stage Hencken burner allows coal particles to experience a reducing environment followed by a transition to an oxidizing environment. This work presents the results of the design and characterization of the new two-stage Hencken burner and its new coal feeder. In a unique approach to the operation of the flat-flame of the Hencken burner, the flame configurations are operated as either a normal flame or inverse flame. Gas temperatures and oxygen concentrations for the Hencken burner are measured in reducing-to-oxidizing and oxidizing environments. The results show that stable flames with well-controlled conditions, relatively uniform temperatures, and species concentrations can be achieved in both flame configurations. This new Hencken burner provides an effective system for evaluating the effect of the reducing-to-oxidizing transition and particle-to-particle interaction on early-stage processes of coal combustion such as ignition and ultrafine particle formation.},
doi = {10.1063/1.5006087},
journal = {Review of Scientific Instruments},
number = 2,
volume = 89,
place = {United States},
year = {2018},
month = {2}
}

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