Abstract
Oil shale is a kind of high-combustion heat mineral, and its oxidation in mining and storage are worth studying. To investigate the low-temperature oxidation characteristics of oil shale, the temperature, CO, alkane and alkene gases were analyzed using a temperature-programmed device. The results showed that the temperature of oil shale underwent three oxidation stages, namely a slow low-temperature oxidation stage, a rapid temperature-increasing oxidation stage, and a steady temperature-increasing stage. The higher the air supply rate is, the higher the crossing point temperature is. Similar to coal, CO also underwent three stages, namely a slow low-temperature oxidation stage, a rapid oxidation stage, and a steady increase stage. However, unlike coal, alkane and alkene gases produced by oil shale underwent four stages. They all had a concentration reduction stage with the maximum drop of 24.20%. Statistical classification of inflection temperature of various gases as their concentrations change showed that the temperature of 140 °C is the key temperature for group reactions, and above the temperature of 140 °C, all alkane and alkene gases underwent the rapid concentration increase stage.
Highlights
The wide application of fossil fuels provides sufficient energy support for industrial production.Oil shale is a combustible, fine bedding sedimentary rock consisting of inorganic minerals and 15–50%organic matters including organic polymers [1]
We examined the characteristics of temperature change and extracted gases of oil shale from Liangjia Coal Mine, China, during low-temperature oxidation in temperature-programmed experiments
The initial slow oxidation stage was mainly characterized as the continuous endothermic process, while the rapid temperature-increasing oxidation stage was mainly characterized as the greater temperature-increasing rate than the programmed temperature-increasing rate, appearance of crossing point temperature as well as massive-heat relief
Summary
The wide application of fossil fuels provides sufficient energy support for industrial production.Oil shale is a combustible, fine bedding sedimentary rock consisting of inorganic minerals and 15–50%organic matters including organic polymers [1]. The wide application of fossil fuels provides sufficient energy support for industrial production. Oil shale is a combustible, fine bedding sedimentary rock consisting of inorganic minerals and 15–50%. Organic matters including organic polymers [1]. The latter is mainly kerogen and distributed in the framework of minerals. The proven oil shale reserves in the world exceed 400 billion tons. As an alternative resource for petroleum, it has been widely exploited around the world [2,3]. Kerogen in oil shale is mainly composed of carbon, hydrogen, and oxygen and can directly react with oxygen [4]
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