EAP - Oil Shale publications

PUBLISHED
SINCE 1984

Oil Shale

ISSN 1736-7492 (Electronic)
ISSN 0208-189X (Print)

Impact Factor (2022): 1.9

OXIDATION CHARACTERISTICS OF THE SEMICOKE FROM THE RETORTING OF OIL SHALE AND WHEAT STRAW BLENDS IN DIFFERENT ATMOSPHERES; pp. 43–61

PDF | https://doi.org/10.3176/oil.2019.1.04

Authors

Mao Mu, Xiangxin Han, BIN CHEN, Xiumin Jiang

Abstract

A new way of utilizing oil shale is its co-retorting with wheat straw for oil. However, the process generates a great amount of combustible solid semicoke waste. To utilize this waste effectively for heating the retorting process, the current work investigated its oxidation characteristics by employing a combined thermogravimetry-mass spectrometry (TG-MS) system, and discussed the effects of three parameters, including the wheat straw mass fraction of matrix samples, as well as different ambient gases and their O₂ volume fraction, on the oxidation of the semicoke. In the presence of O₂, the whole oxidation process of semicoke samples mainly consists of two stages: the combustion stage (300–600 °C) in which water, CO, CO₂ and pollutants are mainly released, and the decomposition stage (600–1000 °C) in which carbonates and sulphates decompose to release CO₂and SO₂, respectively. In the combustion stage, increasing both the wheat straw proportion of the original sample and the O₂ volume faction can improve the combustion performance of the resulting semicoke blends. In the decomposition stage, the gasification reaction also occurs to produce CO. During the entire oxidation process, semicoke in 21% O₂/79% CO₂ would give off less NOx and SO₂thanin air. And, SO₂ formation is also influenced by the O₂ fraction, especially above 900 °C.

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