Doctoral Dissertations

Keywords and Phrases

air-assisted flare; combustion efficiency; computational fluid dynamcs; destraction removal efficiency


"Flare systems provide a safe, efficient, and reliable way to treat unwanted flammable gases that come from relief devices of various chemical processing equipment to ensure the safety of personnel and equipment. Flare systems are classified according to the assist media type as non-assisted (utility), steam-, air-, and pressure-assisted flares. The assist medium enhances mixing between flare gases and surrounding air and induces more air into the combustion zone. An air-assisted flare system is the preferred flare type in regions where steam is unavailable or is costly to supply or ambient temperatures are too low. The environmental protection agency (EPA) considers flares to be a source of emissions with many harmful gases such as unburned waste gases, carbon monoxide, and soot, among others, if their combustion efficiency falls below 96.5%. Low flowrates of waste gases (purge flow conditions) results in flares with combustion efficiency less than 96.5%. During normal operating conditions, these flares process much lower flows of flare gas than they are optimally designed to process. This cause insufficient mixing energy to efficiently mix the flare gas with ambient air. To enhance mixing at these low flow rate conditions without using auxiliary purge fuel or additional assistant medium, a new flare tip design was developed based on previous work done at the John Zink Company in 2002-2003. The work presented in this dissertation documents this flare tip design, its performance assessment under different flow conditions and concludes with recommendations for future work"--Abstract, p. iv


Smith, Joseph D.
Yang, Hu

Committee Member(s)

Al-Dahhan, Muthanna H.
Ludlow, Douglas K.
Homan, Kelly
Flori, Ralph E.


Chemical and Biochemical Engineering

Degree Name

Ph. D. in Chemical Engineering


Missouri University of Science and Technology

Publication Date

Spring 2022


xiv, 99 pages

Note about bibliography

Includes_bibliographical_references_(pages 97-98)


© 2022 Hayder Alhameedi, All Rights Reserved

Document Type

Dissertation - Open Access

File Type




Thesis Number

T 12225