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. Here, 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 showmore » 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.« less

Authors:

Adeosun, Adewale  ^[1];

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• Search DOE PAGES for ORCID "0000-0002-7358-2270"

Huang, Qian ^[2]; Li, Tianxiang ^[1]; Gopan, Akshay  ^[1];

• Search DOE PAGES for author "Gopan, Akshay"
• Search DOE PAGES for ORCID "0000-0002-2158-1196"

Wang, Xuebin ^[3]; Li, Shuiqing ^[2]; Axelbaum, Richard L. ^[1]

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+ Show Author Affiliations

1. Washington Univ., St. Louis, MO (United States). Dept. of Energy, Environmental and Chemical Engineering
2. Tsinghua Univ., Beijing (China). Dept. of Thermal Engineering
3. Washington Univ., St. Louis, MO (United States). Dept. of Energy, Environmental and Chemical Engineering; Xi’an Jiaotong Univ., Xi'an (China). Dept. of Thermal Engineering

Publication Date:

Wed Feb 14 00:00:00 EST 2018

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:

47 OTHER INSTRUMENTATION; Instruments & Instrumentation; Physics