Theoretical study and experimental evaluation of domestic burner

Pao Yue-kong Library Electronic Theses Database

Theoretical study and experimental evaluation of domestic burner

 

Author: Kwok, Arving
Title: Theoretical study and experimental evaluation of domestic burner
Degree: M.Sc.
Year: 2000
Subject: Gas-burners
Combustion
Combustion gases -- Environmental aspects
Hong Kong Polytechnic University -- Dissertations
Department: Multi-disciplinary Studies
Dept. of Mechanical Engineering
Pages: 87, [29] leaves : ill. (chiefly col.) ; 31 cm
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b1517646
URI: http://theses.lib.polyu.edu.hk/handle/200/5191
Abstract: This project is to investigate the characteristics of a domestic burner. Previous researchers have developed a series of theoretical equations for combustion. These equations are based on certain assumptions. The assumptions may deviate from actual condition and cause the result unreasonable. The applicability of the theoretical equations on a domestic burner is very important, especially in burner design. Experiment is setup to examine the theoretical prediction wit the actual measurement. It is found that the relationship between the premixed flame length and aeration air/fuel ratio can be reasonably predicted. By applying Roper's equation on a domestic burner, the diffusion flame length is double the actual value. Although it does not have a precise prediction, it provides a rough idea and presents the trend of diffusion flame length against fuel flow rate. It is also very useful for burner design. Efficiency of a domestic burner, in varies fuel flow rate and air/fuel ratio, is measured. It has higher efficiency at low fuel flow rate and fuel-rich flow. The result is analyzed. With the measurement of flame temperature and distribution, premixed flame (fuel-lean flow) has higher temperature but shorter length. The highest temperature zone of the flame does not touch the cooking pan and hence reduces the efficiency. Pollutant emission of a domestic burner is measured. Pollutant emission decreases at low fuel flow rate. CO, HC emissions decrease at fuel-lean flow but NOX, NO emissions increase. One important aspect of this project is the effect of oxygen enrichment on burner performance. Efficiency increases while pollution decreases with the oxygen content in the primary air. However, flame speed is increased. Flame flashes back and causes small explosion inside burner ports. Moreover, flame temperature is also increased up to 1650 C. Material for burner and cooking pan should be reconsidered.

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