High temperature air combustion applied to incineration

Name: Pitaksa Suvarnakuta

keyword: High temperature air combustion (HiTAC)

ThaSH: solid waste

; Controlled-air incineration

ThaSH: Energy saving

; Flue gas recirculation

Abstract: The objective of this study is to investigate the application of High Temperature Air Combustion (HiTAC) in incineration of solid waste. The studies are divide to four parts, i), to study the effect of preheating wall temperature and primary air supply in combustible gas emissions, ii), to study the burner operation characteristics and fuel consumption, iii), to study the effects of preheated secondary combustion air at different temperatures, iv), to study the effects of preheating diluted secondary combustion air at different conditions. The experiment was done in 17-kW lab-scale controlled-air incinerator. The results from the first part showed that the highest combustible gas concentration was measured in the case of 10% primary air flow and preheated wall temperature at 700oC with 3.45 MJ/Nm3 of HHV. In the second part of the study, it was observed that preheated secondary combustion air affect to a burner operation characteristics and therefore reduce fuel consumption at a factor of 7.7 and 22.9% at preheating air temperatures of 500oC and 1000oC, respectively compared to normal air. The third part, it was observed that the combustion with higher preheated secondary combustion air temperature resulted in an increase in average flame temperature, and a reduction in supplementary fuel consumption, but caused higher NOX emissions. The maximum percentage of energy saved and the increase in NOX emission that occurred with the preheating secondary combustion air at 900oC are 40% and 38%, respectively. In the last part of the study, the preheated diluted secondary combustion air can be saved energy between 26% to 48% compared to non-preheated diluted secondary combustion air with the overall range of NOX reduction was 28% to 38% compared to non-diluted condition. It can be concluded that in order to obtain higher average flame temperature than non-preheated and diluted condition for the purpose of supplementary fuel saving, proper preheated secondary combustion air temperatures should be at least 532oC and 621oC, respectively for 17% and 15% oxygen concentration. The optimum point of this experimental set up and testing range is preheated secondary combustion air at 900oC and diluted at 17% oxygen concentration and the operating ranges are preheated secondary combustion air above 532oC and diluted secondary combustion air between 15% and 21% oxygen concentration. In summary, HiTAC can be applied to incineration process for energy saving with lower emissions.

National Research Council of Thailand. Research Information Center

Address: Bangkok

Email: ric_dir@nrct.go.th

Name: Somrat Kerdsuwan

Role: Advisor

Name: Suthum Patumsawad

Role: Co-Advisor

Modified: 2011-04-22

Issued: 2011-04-22

วิทยานิพนธ์/Thesis

application/pdf

eng

DegreeName: Doctor of Philosophy

Level: Doctoral Degree

Descipline: Mechanical Engineering

Grantor: King Mongkut's University of Technology North Bangkok

©copyrights National Research Council Of Thailand

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