Promoting the resource utilization of oil-based drilling cuttings pyrolysis residues in cement products

Liu, Weishu; Wang, Bo; Du, Youwei; Ma, Liang; Yuan, Bo; Hou, Yaochun; Xiong, Xingyang

doi:10.1016/j.conbuildmat.2023.130886

Cited by 5 publications

(1 citation statement)

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“…The reasonable explanation is that under the condition of sufficient heat transfer, the core temperature inside the drill cuttings is close to the set temperature. Higher temperature not only accelerates heat transfer and oil volatilization into gas, but also causes the desorption and cracking of non-volatile heavy components into gas, and the removal of organic pollution components is more thorough [27]；The oil phase yield continued to increase with the increase of temperature in the range of 250 ° C-350 ° C, and reached the highest value of 17.04 % at 450 ° C. When the temperature rose to 500 ° C, the condensate yield decreased to 15.87 %. The reason for this phenomenon is that the increase in temperature is beneficial to the decomposition, adsorption, and desorption of oil, and also increases the possibility of molecular cracking, which also leads to the secondary cracking of oil and gas molecules at high temperatures [28], resulting in more non-condensable gas and less condensable components.…”

Section: 12assessment Of Activation Energymentioning

confidence: 99%

Study on pyrolysis law of shale gas oil-based drilling cuttings : kinetics and product characteristics

Liu,

Li,

et al. 2024

Preprint

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oil-based cuttings(OBDC)is a typical hazardous waste produced in the process of shale gas field development, and pyrolysis has been proved to be an effective treatment method, that can recover the harmful components and achieve resource reuse. In this paper, thermogravimetric experiments were carried out to study the pyrolysis kinetics, and the effects of pyrolysis temperature on the gas phase yield, oil quality and solid phase heavy metal migration were analyzed. The results show that the pyrolysis of OBDC is divided into three stages, and the light hydrocarbon cracking stage is the key control step of the pyrolysis process. In addition, the maximum weight loss rate of the sample with high heating rate appears at a higher temperature. Friedman (FM), Flynn-Wall-Ozawa (FWO), Kissinger-Akahira-Sunose (KAS), Starink conversion methods can well fit the weight loss curve, and the estimated average activation energy is 185.5,184.16,166.17 and 176.03 kJ / mol, respectively. The estimated values are close and more accurate. The activation energy increases with the deepening of the reaction process. The solid phase products after pyrolysis accounted for more than 70% of the main products. The pyrolysis temperature had a great influence on the liquid phase yield, and the oil phase yield decreased by 1.17% from 450°C to 500°C. In the recovered mineral oil before and after pyrolysis: C15 ~ C28 pyrolysis C10 ~ C14 increased by 2.89%, C15 ~ C28 volatilization decreased by 3.26%, and high temperature aging increased C29 ~ C36 by 0.63%; aromatic hydrocarbons, as the coking parent, change from low ring to high ring. In addition, the content of heavy metals in the residue increased after pyrolysis, and more heavy metals were enriched in the residue. This study is helpful for the solidification of heavy metals and the recycling of solid waste, which is conducive to reducing energy and resource consumption and improving the processing technology of production.

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Section: 12assessment Of Activation Energymentioning

confidence: 99%