Investigation on effect of coal fly ash on properties of corn straw pyrolysis products. (February 2022)

• Record Type: Journal Article
• Authors: Qin, Qianwen; Zhou, Jinsong; Zhou, Lingtao; Guo, Qinghe
• Is Part Of: Journal of the Energy Institute. Volume 100(2022)
• Page Start: 213
• Page End: 224
• Publication Date: 2022-02
• Subjects: Biomass -- Coal fly ash -- Pyrolysis -- Bio-oil distribution -- Char properties; CS corn straw -- FA coal fly ash -- AAEM alkali and alkaline earth metals -- BET Brunauer–Emmett–Teller -- BJH Barrett–Joyner–Halenda -- MAHs monocyclic aromatic hydrocarbons -- PAHs polycyclic aromatic hydrocarbons -- OHAs oxygen containing heterocyclic aromatic compounds; Power (Mechanics) -- Periodicals; Power resources -- Periodicals; Fuel -- Periodicals; 621.04205
• DOI: 10.1016/j.joei.2021.11.011
• Languages: English
• ISSNs: 1743-9671

Abstract

Abstract: The impact of coal fly ash (FA) is often ignored in the co-utilization of biomass and coal. Therefore, the influence of FA on the properties of pyrolysis products made from corn straw (CS) was investigated in this study. First, the distribution of co-pyrolysis bio-oil was investigated using pyrolysis-gas chromatography and mass spectrometry at 500°C-800 °C. Then, in a free-falling fixed-bed reactor, FA and CS were co-pyrolyzed, gaseous product yields were computed, and solid product composition and morphology were determined using X-ray diffraction, scanning electron microscopy, and the N2 adsorption–desorption isotherm, respectively. According to the findings, FA greatly promoted the degradation of oxygen-containing components in bio-oil and the formation of aromatic compounds at higher temperatures. The CS5-FA1 was the most favorable ratio for bio-oil production at 800 °C. Furthermore, the addition of FA had the highest stimulating effect on CO2 at 500 °C and 800 °C, and the yield of the other pyrolysis gases (CH4, CO, and H2 ) was also increased at 800 °C. Highlights: Effect of coal fly ash on the corn straw pyrolysis bio-oil and bio-char characteristics were concerned. Coal fly ash promoted the decomposition of oxygen-containing components in bio-oil at 500°C-800 °C. The presence of coal fly ash promoted the formation of aromatics and pyrolysis gases at 800℃. The addition of coal fly ash in a large proportion blocked the surface and pores of bio-char.