Experimental studies on Heating and Burning of Single Droplet of Deasphalted Oil

Abstract

In this research single drop of heavy fuel oil series is used to investigate the evaporation and combustion characteristics to improve the combustion efficiency of the industrial furnace This research consists of two experiments such as single suspended droplet experiment and thermogravimetrics analysis The single suspended droplet experiment is used to investigate the evaporation behaviors of the single droplet in a stationary motion at three different high ambient temperatures and thermogravimetrics analysis is used to investigate the thermal behavior of the three oils under oxidation process The suspended droplet experiment of heavy oil series results showed that some admiring phenomena were founded such as expansion micro-explosion ejection bubbling char formation Increasing ambient temperature will be increasing evaporation rate and a number of micro-explosion per sec bubbling swelling phenomena of heavy oil series and reducing the initial heat absorption period droplet lifetime The thermogravimetrics analysis result showed that the HFO is heated in three stages Low Temperature Oxidation (LTO) Fuel Decomposition (FD) and High Temperature Oxidation (HTO) DAO is heated in two stages LTO and HTO and Diesel has one step mechanism We also found the combustion parameter such as ignition temperature burnout temperature and combustion index We saw that ignition temperature of DAO and Diesel is nearly same But diesel have better combustion characteristics index than other two oils this means diesel can ignite easily and burn out It shows that diesel is refine oil Even ignition temperature of Diesel and DAO is nearly same but there is difference in burnout temperature Because DAO have heavy fraction compound which needs high temperature to burn out As HFO has low volatile matter so the ignition temperature increases

Date of Award	2018 Feb 7
Original language	English
Supervisor	Yei-Chin Chao (Supervisor)