Analysis of the chosen thermal and flammability parameters of dried sewage dust |
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| Affiliation: | 1. Faculty of Safety Engineering and Civil Protection, The Main School of Fire Service, Slowackiego 52/54, 01-629, Warsaw, Poland;2. Faculty of Safety Engineering, VSB-Technical University of Ostrava, Lumírova 630/13, 700 30, Ostrava, Czech Republic;1. College of Safety Science and Engineering, Nanjing Tech University, Nanjing, 210000, China;2. Jiangsu Key Laboratory of Hazardous Chemicals Safety and Control, Nanjing, 210000, China;3. Nanjing Vocational University of Industry Technology, Nanjing, 210000, China;1. Department of Materials, Textiles and Chemical Engineering, Ghent University Technologiepark 46, B9052, Ghent, Belgium;2. Umicore R&D, B2250, Olen, Belgium;1. Department of Materials Engineering, Isfahan University of Technology, Isfahan, 84156-83111, Iran;2. Pars Oil and Gas Company (POGC), Asaluyeh, Bushehr, Iran;3. Isfahan Gas Company, Isfahan, Iran;1. College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao, 266590, China;2. Mine Disaster Prevention and Control-Ministry of State Key Laboratory Breeding Base, Shandong University of Science and Technology, Qingdao, 266590, PR China;3. Qingdao Intelligent Control Engineering Center for Production Safety Fire Accident, Qingdao, 266590, PR China;4. Sinochem Holdings Corporation Ltd., Beijing, 100031, PR China |
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| Abstract: | The hazardous sludge disposal process in the form of landfills requires the determination inter alia of the flammable and explosion properties of dried sewage sludge dust, which has the ability to ignite and spontaneously combust when stored in silos. At a constant furnace surface temperature, the minimum ignition temperature of the sludge dust layer with a layer thickness of 5 mm is 270 °C, and for a layer thickness of 12.5 mm it is 250 °C. Two selected fire extinguishing powders for Class A, B, C and D fires were used in the study to determine the possibility of reducing the susceptibility of dried wastewater to ignition from heated surface, self-ignition and explosion parameters. The most effective extinguishing powder was ABC Favorit, which increased the value of the minimum ignition temperature of the layer (5 mm thick) to 360 °C and the spontaneous ignition temperature of the sludge with this powder increased by 22 °C at 169.6 cm3 in comparison to the sludge without extinguishing powder, respectively. The lowest self-ignition temperature of 136 °C was recorded for the largest tested volume (169.6 cm3) for dried sewage dust without any fire extinguishing powders. The biggest values of pmax and (dp/dt)max dried sewage dust were recorded 4.8 bar and 113 bar/s respectively. By analysing the obtained test results, it can be assumed that dried sewage dust is a combustible material with properties similar to biomass. |
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| Keywords: | Flammability Dry sludge Process safety Safe storage |
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