title: Mechanisms and kinetics of granulated sewage sludge combustion.
abstract: This paper investigates sewage sludge disposal methods with particular emphasis on combustion as the priority disposal method. Sewage sludge incineration is an attractive option because it minimizes odour, significantly reduces the volume of the starting material and thermally destroys organic and toxic components of the off pads. Additionally, it is possible that ashes could be used. Currently, as many as 11 plants use sewage sludge as fuel in Poland; thus, this technology must be further developed in Poland while considering the benefits of co-combustion with other fuels. This paper presents the results of experimental studies aimed at determining the mechanisms (defining the fuel combustion region by studying the effects of process parameters, including the size of the fuel sample, temperature in the combustion chamber and air velocity, on combustion) and kinetics (measurement of fuel temperature and mass changes) of fuel combustion in an air stream under different thermal conditions and flow rates. The combustion of the sludge samples during air flow between temperatures of 800 and 900°C is a kinetic-diffusion process. This process determines the sample size, temperature of its environment, and air velocity. The adopted process parameters, the time and ignition temperature of the fuel by volatiles, combustion time of the volatiles, time to reach the maximum temperature of the fuel surface, maximum temperature of the fuel surface, char combustion time, and the total process time, had significant impacts.
authors: Czestochowa University of Technology, Institute of Thermal Machinery, Armii Krajowej 21, 42-201 Czestochowa, Poland. Electronic address: kijo@imc.pcz.czest.pl.
authors: Agnieszka
authors: A
authors: Kijo-Kleczkowska
authors: Czestochowa University of Technology, Institute of Thermal Machinery, Armii Krajowej 21, 42-201 Czestochowa, Poland.
authors: Katarzyna
authors: K
authors: Środa
authors: Czestochowa University of Technology, Institute of Thermal Machinery, Armii Krajowej 21, 42-201 Czestochowa, Poland.
authors: Monika
authors: M
authors: Kosowska-Golachowska
authors: Czestochowa University of Technology, Institute of Thermal Machinery, Armii Krajowej 21, 42-201 Czestochowa, Poland.
authors: Tomasz
authors: T
authors: Musiał
authors: Czestochowa University of Technology, Institute of Thermal Machinery, Armii Krajowej 21, 42-201 Czestochowa, Poland.
authors: Krzysztof
authors: K
authors: Wolski
mesh_terms: D000392:Air Movements; D017745:Incineration / Q000379:methods*; D007700:Kinetics; D011044:Poland; D012722:Sewage / Q000737:chemistry*; D013696:Temperature; D018505:Waste Management / Q000379:methods*
chemical_list: D012722:Sewage
keywords: Fuels combustion; Rotal-uniformal research plan; Sewage sludge; Thermal utilization