Heating Characteristics of Sewage Sludge Pyrolysis Oil Mixed with Heavy Fuel Oil

Abstract

An investigation was performed into the heating characteristics of dried sewage sludge (DSS) sewage sludge pyrolysis oil (SPO) heavy fuel oil (HFO) and fuel blends consisting of SPO mixed with HFO (SPO/HFO fuel blend) The properties of DSS and SPO were analyzed and compared with those of Australia coal and HFO The ignition temperature (Ti) burnout temperature (Te) flammability index (C) and combustion characteristics index (S) of the various fuels were evaluated by means of thermogravimetric analysis (TGA) Furthermore the heating behaviors of the SPO droplet HFO droplet and SPO/HFO fuel blend droplets were observed at ambient temperatures of 500°C 550°C and 600°C using a suspended droplet experimental method The TGA results showed that the combustion process of the DSS SPO and SPO/HFO fuel blends comprises three main stages namely dewaterization stage volatile decomposition and burning stage and combustion stage In the decomposition stage the fuel blends with a higher SPO content exhibited greater C and S values due to the release and oxidation of the lightweight components (LWC) However their C and S were quite similar for the highweight components (HWC) that burnout in the combustion stage The suspended droplet experiments showed that the addition of a greater amount of SPO to the SPO/HFO fuel blend was beneficial in improving the combustion rate In general adding any quantity of SPO to the SPO/HFO fuel blend enhances the combustion efficiency

Date of Award	2017 Jul 26
Original language	English
Supervisor	Ta-Hui Lin (Supervisor)