Gasification characteristics of waste plastics (SRF) in a bubbling fluidized bed: Effects of temperature and equivalence ratio. (1st January 2022)

• Record Type: Journal Article
• Authors: Han, Si Woo; Lee, Jeong Jae; Tokmurzin, Diyar; Lee, Seok Hyeong; Nam, Ji Young; Park, Sung Jin; Ra, Ho Won; Mun, Tae-Young; Yoon, Sang Jun; Yoon, Sung Min; Moon, Ji Hong; Lee, Jae Goo; Kim, Young-Min; Rhee, Young Woo; Seo, Myung Won
• Is Part Of: Energy. Volume 238:Part C(2022)
• Publication Date: 2022-01-01
• Subjects: Waste plastics -- Fluidized bed -- Air gasification -- Equivalence ratio -- Tar; CCE carbon conversion efficiency -- CGE cold gas efficiency -- DTG derivative thermo-gravimetry -- EDS energy dispersive spectrum -- GC gas chromatography -- HC hydrocarbon -- HDPE high-density polyethylene -- LDPE low-density polyethylene -- NDIR non-dispersive infrared -- PET polyethylene terephthalate -- PP polypropylene -- PVC polyvinyl -- SEM scanning electron microscope -- SRF solid refuse fuel -- TGA thermo-gravimetric analysis; Power resources -- Periodicals; Power (Mechanics) -- Periodicals; Energy consumption -- Periodicals; 333.7905
• DOI: 10.1016/j.energy.2021.121944
• Languages: English
• ISSNs: 0360-5442

Abstract

Abstract: This study investigates air gasification properties of SRF with high content of residual mixed waste plastic in a 1 kg/h lab scale bubbling fluidized bed gasifier. Gasifier internal diameter is 0.114 m and its height is 1 m. Silica sand particles with a mean diameter of 400 μm is used as the bed material. During the gasification experiments the effect of bed temperature is determined in the range of 600–900 °C and the effect of air-to-fuel equivalence ratio (ER) is investigated in the range of 0.15–0.30. Gas analysis is conducted using a non-dispersive infrared analyzer and gas chromatograph. As the operating temperature and ER increases, the gas yield increases, and tar yield decreases. The yield of CO, CH4, H2, and C2 H2 in the gas product increases with temperature, whereas those of CO2, C2 –C3 hydrocarbons decreases. The increase in ER decreases the concentrations of CO, CH4, H2, and C2 –C3 hydrocarbons and increases the CO2 in the gas product. H2 /CO ratio substantially increases with rising temperature and decreases with rising ER. Carbon conversion efficiency (CCE) and cold gas efficiency reach peak at 800 °C and ER of 0.25. Highlights: Air gasification of waste plastics were determined in lab-scale bubbling fluidized bed. Operating temperature and equivalence ratio varied at a constant gas velocity. CCE, heating value, and CGE showed highest values at 800 °C. Product gas calorific value and CGE decreased with an increase in ER. A detailed reaction route of SRF gasification is proposed.