The Pyrolysis Characteristics and Pore Structure of Oil Shale of Different Densities

Abstract Under the pressure of environmental problems and fossil energy shortage, countries all over the world are looking for fuel to replace fossil energy. Oil shale and rice husk are potential fuels, but they both have some problems, such as high ash content and low calorific value .In the present study,oil shale and rice husk were used as feedstock for the high quality fuel through hydrothermal approach,it provides a new way for the resource utilization of oil shale and rice.Thermogravimetric method was used to analyze the functional groups change and thermal transformation characteristics of mixed hydrochars prepared for oil shale(OS) and rice husk(RH) at different hydrothermal temperatures(150,200 and 250℃), including combustion and pyrolysis processes, and analyze the synergistic effects. Results showed that the co-hydrocharsization pretreatment had a significant effect on the thermal transformation behavior of oil shale and rice husk.On the one hand, the mixture of hydrocar has higher volatile content than its calculated value.On the other hand,a synergistic effect(promoting combustion and pyrolysis behavior) was found in both combustion and pyrolysis processes, and this effect was the most obvious when the hydrothermal temperature was around 200℃,and the characteristic peak of functional groups vibration was strong.Since the synergistic effect of pyrolysis process is lower than that of combustion process, co-hydrocharsation products are considered to be more suitable for combustion.These findings have positive significance of energy generation and utilization of organic waste by the combination of co-hydrocharsization modification and subsequent thermochemical process.

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Evolution characteristics and model of nanopore structure and adsorption capacity in organic-rich shale during artificial thermal maturation: A pyrolysis study of the Mesoproterozoic Xiamaling marine shale with type II kerogen from Zhangjiakou, Hebei, China

Energy Exploration & Exploitation ◽

10.1177/0144598718810256 ◽

2018 ◽

Vol 37 (1) ◽

pp. 493-518 ◽

Cited By ~ 2

Author(s):

Liangwei Xu ◽

Yang Wang ◽

Luofu Liu ◽

Lei Chen ◽

Ji Chen

Keyword(s):

Pore Structure ◽

Adsorption Capacity ◽

Surface Area ◽

Pore Volume ◽

Oil Shale ◽

Hydrocarbon Generation ◽

Type Ii ◽

Thermal Maturation ◽

Evolution Characteristics ◽

Nanopore Structure

Thermal maturity has a considerable impact on hydrocarbon generation, mineral conversion, nanopore structure, and adsorption capacity evolution of shale, but that impact on organic-rich marine shales containing type II kerogen has been rarely subjected to explicit and quantitative characterization. This study aims to obtain information regarding the effects of thermal maturation on organic matter, mineral content, pore structure, and adsorption capacity evolution of marine shale. Mesoproterozoic Xiamaling immaturity marine oil shale with type II kerogen in Zhangjiakou of Hebei, China, was chosen for anhydrous pyrolysis to simulate the maturation process. With increasing simulation temperature, hydrocarbon generation and mineral transformation promote the formation, development, and evolution of pores in the shale. The original and simulated samples consist of closed microspores and one-end closed pores of the slit throat, all-opened wedge-shaped capillaries, and fractured or lamellar pores, which are related to the plate particles of clay. The increase in maturity can promote the formation and development of pores in the shale. Heating can also promote the accumulation, formation, and development of pores, leading to a large pore volume and surface area. The temperature increase can promote the development of pore volume and surface area of 1–10 and 40-nm diameter pores. The formation and development of pore volume and surface area of 1–10 nm diameter pores are more substantial than that of 40-nm diameter pores. The pore structure evolution of the sample can be divided into pore adjustment (T < 350°C, EqRo < 0.86%), development (350°C < T < 650°C, 0.86% < EqRo < 3.28%), and conversion or destruction stages (T > 650°C, EqRo > 3.28%). Along with the increase in maturity, the methane adsorption content decreases in the initial simulation stage, increases in the middle simulation stage, and reaches the maximum value at 650°C, after which it gradually decreases. A general evolution model is proposed by combining the nanopore structure and the adsorption capacity evolution characteristics of the oil shale.

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Pyrolysis characteristics of a North Korean oil shale

Petroleum Science ◽

10.1007/s12182-014-0358-x ◽

2014 ◽

Vol 11 (3) ◽

pp. 432-438 ◽

Cited By ~ 8

Author(s):

Wei Wang ◽

Shuyuan Li ◽

Linyue Li ◽

Yue Ma ◽

Changtao Yue ◽

...

Keyword(s):

Oil Shale ◽

Pyrolysis Characteristics

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Study on the microwave catalytic pyrolysis characteristics and energy consumption analysis of oil shale

IOP Conference Series Earth and Environmental Science ◽

10.1088/1755-1315/133/1/012021 ◽

2018 ◽

Vol 133 ◽

pp. 012021

Author(s):

Chunxiang Chen ◽

Zheng Cheng ◽

Qing Xu ◽

Songheng Qin

Keyword(s):

Energy Consumption ◽

Oil Shale ◽

Catalytic Pyrolysis ◽

Pyrolysis Characteristics ◽

Energy Consumption Analysis

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Investigation on the catalytic effect of AAEMs on the pyrolysis characteristics of Changji oil shale and its kinetics

Fuel ◽

10.1016/j.fuel.2020.117287 ◽

2020 ◽

Vol 267 ◽

pp. 117287 ◽

Cited By ~ 1

Author(s):

Yang Lu ◽

Ying Wang ◽

Qi Wang ◽

Jing Zhang ◽

Yuqiong Zhao ◽

...

Keyword(s):

Oil Shale ◽

Catalytic Effect ◽

Pyrolysis Characteristics

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Pore Structure Petrophysical Characterization of the Upper Cretaceous Oil Shale from the Songliao Basin (NE China) Using Low-Field NMR

Journal of Spectroscopy ◽

10.1155/2020/9067684 ◽

2020 ◽

Vol 2020 ◽

pp. 1-11 ◽

Cited By ~ 1

Author(s):

Xin Liu ◽

Jinyou Zhang ◽

Yunfeng Bai ◽

Yupeng Zhang ◽

Ying Zhao ◽

...

Keyword(s):

Pore Structure ◽

Oil Shale ◽

Upper Cretaceous ◽

Distribution Patterns ◽

Songliao Basin ◽

Shale Oil ◽

Low Field ◽

Wide Range ◽

Low Field Nmr

Low-field NMR theory was employed to study the pore structure of the upper cretaceous oil shale, on the basis of fourteen core samples collected from Qingshankou (UCQ) and Nenjiang (UCN) formations in the Songliao basin. Results indicated that the T2 spectra from NMR measurements for collected samples contain a dominant peak at T2 = 1∼10 ms and are able to be categorized as three types—unimodal, bimodal, and trimodal distributions. The various morphologies of T2 spectra indicate the different pore type and variable connection relationship among pores in shale. By contrast, UCN shale has more single pore type and adsorption pores than UCQ shale. Besides, NMR-based measurements provide reliable characterization on shale porosity, which is verified by the gravimetric approach. Porosities in both UCN and UCQ shales have a wide range (2.3%∼12.5%) and suggest the strong heterogeneity, which partly makes the challenge in selection of the favorable area for shale oil exploration in the Songliao basin. In addition, the pore size of the collected sample has two distribution types, namely, peaked at ∼10 nm and peaked at ∼100 nm. Similarly, two distribution patterns emerge to the specific surface area of the study shale—peaked at ∼2 nm−1 and peaked at ∼20 nm−1. Here, more investigations are needed to clarify this polarization phenomenon. Basically, this study not only exhibits a preliminary understanding on the pore structure of the upper cretaceous oil shale, but also shows the reliability and pertinency of the low-field NMR technique in the petrophysical characterization of the shale oil reservoir. It is expected that this work is helpful to guide the investigation on the pore structure of oil shale from the Songliao basin in theory.

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STUDY ON PYROLYSIS CHARACTERISTICS OF HUADIAN OIL SHALE WITH ISOCONVERSIONAL METHOD

Oil Shale ◽

10.3176/oil.2009.2.07 ◽

2009 ◽

Vol 26 (2) ◽

pp. 148 ◽

Cited By ~ 14

Author(s):

W QING ◽

L HONGPENG ◽

S BAIZHONG ◽

L SHAOHUA

Keyword(s):

Oil Shale ◽

Isoconversional Method ◽

Pyrolysis Characteristics

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