Effects of volatile-char interaction on the product properties from municipal sludge pyrolysis
SSRN Electronic Journal(2023)
Abstract
In order to realize the harmless treatment and resource utilization of municipal sludge, the effect of volatile-char interaction on the properties of sludge pyrolysis products was investigated using a two-stage pyrolysis reactor. The experimental results show that volatile-char interaction promotes the decomposition of organic compounds into small molecular gases, which increases the gas yield and reduces the liquid and oil yields. Under the experimental conditions, the volatile-char interaction increases the mass yields of H-2, CO and CO2 to varying degrees, and the yield of H-2 increases maximum by 55.7-114.5% compared to that without interaction. The effect of interaction on the composition of bio-oil occurs mainly at low temperature range of 400-600 degrees C by reducing the content of oxygen-containing compounds except for aldehydes/ketones. The physical and chemical structure of solid char changes dramatically with the interaction. The enhanced removal of O-containing groups occurs and the degree of aromaticity of the char is increased due to the strengthened dehydrogenation and polycondensation of hydrocarbons. Meanwhile, the transformation of non-hydroxyapatite phosphorus to hy-droxyapatite phosphorus in solid phase products is greatly promoted at high temperature of 700-800 degrees C, increasing the potential utilization of char as carbon-based phosphate fertilizer in agriculture.
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Key words
Municipal sludge,Pyrolysis,Volatile-char interaction,Phosphorus
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