Evaluation of Oil Sludge Ash as a Solid Heat Carrier in the Pyrolysis Process of Oil Sludge for Oil Production

Cheng, Shuo; Takahashi, Fumio; Quan, Cui; Yoshikawa, Kunio; Li, Aimin

doi:10.1021/acs.energyfuels.6b00648

Cited by 43 publications

(18 citation statements)

References 36 publications

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“…OS pyrolysis has proven to be an effective way for cascade utilization of waste resources, which has led to more and more concerns from researchers. The OS pyrolysis process can produce char, oil, and gases, with different production distributions depending on different operation conditions.…”

Section: Introductionmentioning

confidence: 99%

“…The addition of a catalyst can improve the pyrolysis performance of sludge to different extents. The effects of chemical additives (aluminum, iron, sodium, calcium, and potassium compounds) and solid waste (OS ash, fly ash, zeolite, and polyethylene) on the performance of sludge pyrolysis with the application of thermogravimetric and laboratory‐scale reactors have been studied by many researchers.…”

Section: Introductionmentioning

confidence: 99%

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Study on pyrolysis of oil sludge with microalgae residue additive

Gong

Wang

et al. 2018

Can J Chem Eng

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The pyrolysis of oil sludge (OS) with microalgae residue (MR) additive was conducted with a TGA and a tube furnace. The pyrolysis process of OS with the MR additive can be divided into three stages: 1) water evaporation, 2) the release of light groups of hydrocarbon compounds, the cracking of heavy groups, and carbon decomposition, and 3) minerals decomposition. With the MR addition ratio increasing, the yield of oil and gas increased, and oil to gas ratio increased during OS pyrolysis. The MR addition improved the quality of pyrolysis oil and gas from OS pyrolysis. The proportion of light oil increased from 38 % with a 5 % MR addition ratio to 45 % with a 30 % addition ratio. Major components of pyrolysis gas included H 2 , CO, CO 2 , and C x H y . With the increase of the MR blending ratio, CO and CO 2 contents increased, while H 2 and C x H y contents decreased. Adding MR favoured the transformation of heavy hydrocarbons (C 6þ ), resulting in a high content of light hydrocarbons. This work can help promote massive synergistic treatment of OS and microalgae biomass.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study on pyrolysis of oil sludge with microalgae residue additive

Gong

Wang

et al. 2018

Can J Chem Eng

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“…Ma et al (2014) found gas yield increased from 2.89 wt% at the sludge/sand ratio of 1:0 to 28.25 wt% at the sludge/sand ratio of 1:3 due to the high heat transfer coefficient in sand. Cheng et al (2016a) found the addition of oily sludge ash increased the H2 content from 26.62 wt% (no addition) to 34.05 wt%. The increase of H2 content could be attributed to the catalytic effect of CaO contained in the oily sludge ash (Cheng et al, 2016b).…”

Section: Effects Of Parameters On Gas Productionmentioning

confidence: 95%

“…Ma et al (2014) evaluated quartz sand as a solid heat carrier in the pyrolysis process of oily sludge and they found oil yield increased from 16.63 wt% at the sludge/sand ratio of 1:0 to the maximum yield of 28.87 wt% at sludge/sand ratio of 1:2. They suggested this could be due to the higher heat transfer coefficient of quartz sand (i.e., 1.03 W/m•K) than that of the gas medium (i.e., 0.25 W/m•K) (Cheng et al, 2016a;Ma et al, 2014). Studies on the addition of oily sludge ash in the pyrolysis of oily sludge have been carried out with TGA (Shie et al, 2004) and stirred tank reactor (Cheng et al, 2016a(Cheng et al, , 2016b.…”

Section: Effects Of Parameters On Liquid Productionmentioning

confidence: 99%

“…They suggested this could be due to the higher heat transfer coefficient of quartz sand (i.e., 1.03 W/m•K) than that of the gas medium (i.e., 0.25 W/m•K) (Cheng et al, 2016a;Ma et al, 2014). Studies on the addition of oily sludge ash in the pyrolysis of oily sludge have been carried out with TGA (Shie et al, 2004) and stirred tank reactor (Cheng et al, 2016a(Cheng et al, , 2016b. It was reported that the addition of oily sludge ash not only decreased the carbon residue of the oil product but also increased the light oil/heavy oil ratio.…”

Section: Effects Of Parameters On Liquid Productionmentioning

confidence: 99%

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Novel treatment and value-added utilization of oily sludge using ionic liquid and pyrolysis

Tian¹

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The effective treatment of oily sludge has been a challenging problem faced by the petroleum industry worldwide. It is a semi-solid mixture of hydrocarbons, water, metallic ions, and suspended fine solids. The recalcitrant nature of oily sludge makes the treatment a difficult and costly task. The objective of this dissertation research was to develop environmentally friendly and economically competitive techniques for oily sludge treatment. Three different approaches were developed: ionic liquid (IL)-enhanced solvent extraction, co-pyrolysis with wood waste, and value-added utilization of oily sludge as sorbent to remove lead (Pb 2+) and cadmium (Cd 2+) from solution. Firstly, as compared to conventional solvent extraction, the ILenhanced solvent extraction not only improved oil recovery efficiency but also greatly reduced solvent and energy consumption as well as shortening the treatment duration even at low IL concentration. Secondly, co-pyrolysis of oily waste and hog fuel was conducted in a fixed bed reactor. Three experimental parameters (pyrolysis temperature, reaction time, and hog fuel addition) were explored to optimize both oil recovery and metal ion immobilization. The latter was tested through sequential extraction techniques with high temperature pyrolysis leading to metal ions fixed within the residues. The addition of hog fuel had a significant synergistic effect on the distribution of metal ions in the various extraction fractions resulting in lower risk index (RI) values. Thirdly, the oily sludge-derived char (OS500) obtained at 500 °C could effectively remove Pb 2+ from solution with the maximum sorption capacity of 373.2 mg/g (based on a Langmuir model). Sorption of Pb 2+ by the OS500 was mainly attributed to its precipitation with carbonate (CO3 2-) originating in OS500. The maximum sorption capacity for Cd 2+ , using a Langmuir model, was 23.19 mg/g. Complexation and metal ion exchange dominated Cd 2+ sorption on OS500. The Pb 2+ sorption capacity dramatically decreased as the iii pyrolysis temperature increased from 500 to 900 °C due to the decomposition of minerals which could release CO3 2at high temperature. The activated OS500 showed a higher sorption capacity (90.06 mg/g) for Cd 2+ than OS500 (23.95 mg/g) because conversion of barite (BaSO4) to witherite (BaCO3) after chemical activation favored the precipitation of Cd-carbonate. iv CO-AUTHORSHIP For all the chapters in this dissertation, I was the principal investigator including design of studies, acquisition of data, and analysis of data. I wrote the manuscripts and was responsible for incorporating comments and feedbacks in the revised manuscripts. Dr. Jianbing Li supervised the experiments and contributed to experimental design, data analysis, and revision of the manuscripts. He is included in authorship on all resulting publications. Dr. Bill McGill and Dr. Todd Whitcombe contributed to the design and implementation of experiments and helped review and improve the manuscripts, so they were included in some of my publications. Dr. ...

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Analysis of gas product changes during pyrolysis of oily sludge based on density functional theory calculation

Wen¹,

Cheng

Liu

et al. 2023

Asia-Pacific J Chem Eng

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Oily sludge is a kind of harmful solid waste produced by the petroleum industry. It is the key point of research to understand the mechanism of gas product changes during the pyrolysis process. This study combined density functional theory (DFT) calculation with a pyrolysis experiment to explore the changes in pyrolytic gas products from oily sludge. The results of thermogravimetric–mass spectrometry (TG–MS) and gas chromatography–mass spectrometry (GC–MS) showed that the gas products below 400°C were dominated by long‐chain hydrocarbons, but with the increase of the treatment temperature, the long‐chain hydrocarbons will decrease. The results of kinetics and thermodynamics showed that there were five stages of pyrolysis of oily sludge, and the values of E, ΔH, and ΔG were increased with the increase of pyrolysis temperature. The DFT calculation revealed that there were delocalized π‐electrons at the fracture‐prone sites, and the electrons on the functional groups of the molecule were more easily excited. The results can provide ideas for the pyrolysis mechanism of oily sludge and theoretical support for the optimization of the pyrolysis process.

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Evaluation of Oil Sludge Ash as a Solid Heat Carrier in the Pyrolysis Process of Oil Sludge for Oil Production

Cited by 43 publications

References 36 publications

Study on pyrolysis of oil sludge with microalgae residue additive

Study on pyrolysis of oil sludge with microalgae residue additive

Novel treatment and value-added utilization of oily sludge using ionic liquid and pyrolysis

Analysis of gas product changes during pyrolysis of oily sludge based on density functional theory calculation

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