Underground coal gasification and its strategic significance to the development of natural gas industry in China

Zou, Caineng; Chen, Yanpeng; Kong, Lingfeng; Sun, Fenjin; Chen, Shanshan; Dong, Zhongqi

doi:10.1016/s1876-3804(19)60002-9

Cited by 65 publications

(21 citation statements)

References 9 publications

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“…If the temperature of the CFB system increases continuously, which may cause the more carbon conversion, because higher temperature leads the more efficient gasification process. Some previous research [59] explained that during the gasification in CFB systems major parameters like gas yield, heating value and char/tar yield are affected by temperature. Some other research article explained about effect of temperature on gasification.…”

Section: Temperature-effectmentioning

confidence: 99%

A Brief Review on Hydrodynamic Behaviour Analysis of Coal Gasification in a Circulating Fluidized Bed Gasifier

Dwivedi¹,

Karmakar²,

Pramanick³

et al. 2019

IJHT

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In this paper a brief review on hydrodynamic characteristic of coal gasification is presented. Firstly an introduction of hydrodynamics then parameters related to hydrodynamics is discussed. In the last several decades Coal gasification is an important method to use of coal resources. The hydrodynamic characteristics have an important role to design of Circulating fluidized bed gasifiers. Circulating fluidized bed (CFB) gasifiers widely use due to their high reaction rates and high thermal efficiency. The present study includes some hydrodynamics properties of coal gasification such as effect of pressure and temperature, solid hold up, solid circulation rate, gas-solid contact, particle residency time, coal feeding rate and coal feeding position. During the brief review on hydrodynamics characteristics of coal each section of CFBs such as riser, cyclone, stand-pipe and loop seal have been considered.

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Section: Temperature-effectmentioning

confidence: 99%

A Brief Review on Hydrodynamic Behaviour Analysis of Coal Gasification in a Circulating Fluidized Bed Gasifier

Dwivedi¹,

Karmakar²,

Pramanick³

et al. 2019

IJHT

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“…Underground coal gasification (UCG), as a coal in situ utilization technology, can not only recover and utilize low-rank coal seams that cannot be economically mined or are difficult to mine by traditional coal mining technology − but can also be an effective method for mining coal seams with high sulfur, high ash, high gas, residual coal, and deep coal seam . As a result, it has received more and more attention from countries. − …”

Section: Introductionmentioning

confidence: 99%

Research on the Pollutant Migration Law Based on Large-Scale Three-Dimensional Similar Simulation Experiments of Underground Coal Gasification

et al. 2022

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The potential pollution risk of underground coal gasification (UCG) has become a key factor restricting the development of UCG industrialization. Therefore, studying the migration and diffusion behavior of harmful pollutants is of great significance for preventing UCG pollution. In this paper, a large-scale three-dimensional similar simulation experimental device for UCG is used to simulate the gasification of Tianjin fat coal under actual working conditions. The rock layer around the simulated coal seam was sampled after the gasification was completed, the contaminants in the samples were examined by XRD, and the changes in the relative content of the contaminants at different sampling points were studied by FTIR. The results showed that benzene, phenols, aldehydes, aromatic hydrocarbons, and aromatic heterocyclic compounds remained after the gasification of No. 7 sampling point in Qianjiang, Tianjin, and that the main pollutants were aromatic hydrocarbons. The migration and enrichment of phenol and aldehyde pollutants were about the same on the east and west sides of the gasification center, while benzene pollutants were more easily migrated and enriched than aromatic heterocyclic compounds. The migration distance of phenolic pollutants on the south side of the gasification area is smaller than that of other pollutants and their maximum vertical distance from the gasification reaction area to the south is about 0.7 m. The results can provide a scientific basis for pollutant risk identification and prevention and control in the later UCG field test.

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“…The pressure-controlled pyrolysis technology can extract tar from the abundant coal resources, and obtain important chemical raw materials, such as anthracene, naphthalene, benzene, and toluene. It is not only an important support in the field of the national energy and chemical industry [2,3], but also an important direction of coal classified utilization [4]. For a long time, the research on direct coal liquefaction has focused on the improvement of the catalytic hydrogenation process and equipment [5,6], catalyst selection and preparation [7,8], tar composition, and content optimization [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Modeling and Numerical Simulation of the Inlet Velocity on Oil–Water Two-Phase Vapor Separation Efficiency by the Hydrocyclone

Zhao

Sun²,

Wang³

et al. 2022

Energies

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The density of tar vapor and water vapor produced by coal pyrolysis is different. Different centrifugal forces will be generated when they flow through the hydrocyclone. The water vapor and tar vapor are divided into inner and outer layers. According to this phenomenon, the moisture in the tar can be removed. In this paper, a Eulerian gas–liquid two-phase flow model is established by numerical simulation to study the effect of inlet velocity on the separation effect of a designed hydrocyclone (split ratio 0.2). The results show that the inlet velocity and moisture content have an influence on the volume distribution characteristics, tangential velocity, axial velocity, pressure drop distribution, and separation efficiency of tar vapor and water vapor in the hydrocyclone. When the inlet velocity increases from 2.0 to 12.0 m/s, the central swirl intensity increases, and the negative pressure sweep range at the overflow outlet increases. The axial velocity increased from 2.8 to 14.9 m/s, tar vapor content at the overflow outlet decreased from 74% to 37%, and at the underflow outlet increased from 89% to 92%. When the moisture content is lower than 10%, the hydrocyclone with the split ratio of 0.20 is no longer suitable for the separation of oil–water two-phase vapor. However, when the water content is higher than 20%, the purity of tar vapor at the underflow outlet can reach 92%, and the overflow outlet needs multistage separation to realize tar purification.

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Underground coal gasification and its strategic significance to the development of natural gas industry in China

Cited by 65 publications

References 9 publications

A Brief Review on Hydrodynamic Behaviour Analysis of Coal Gasification in a Circulating Fluidized Bed Gasifier

A Brief Review on Hydrodynamic Behaviour Analysis of Coal Gasification in a Circulating Fluidized Bed Gasifier

Research on the Pollutant Migration Law Based on Large-Scale Three-Dimensional Similar Simulation Experiments of Underground Coal Gasification

Modeling and Numerical Simulation of the Inlet Velocity on Oil–Water Two-Phase Vapor Separation Efficiency by the Hydrocyclone

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