Effect of oxygen and steam on gasification and power generation in industrial tests of underground coal gasification

Huang, Wengang; Zuo-tang, Wang; Duan, Tianhong; Xin, Lin

doi:10.1016/j.fuel.2020.119855

Cited by 24 publications

(20 citation statements)

References 24 publications

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“…The course of this process is influenced by many factors, the most important of which are the oxygen concentration in the gasifying agent and its flow rate, process pressure and temperature, coal composition and geological conditions (Blinderman and Friedmann 2006;Kreinin et al 1982). From the literature (Hamanaka et al 2017;Huang et al 2021;Shu et al 2020), it is known that the higher the concentration of oxygen in the gasifying agent, the higher the temperature, and in turn the higher the concentration of CO and H 2 process gas. When it comes to CO 2 concentration, at a low reaction pressure, with a temperature increase from about 650°C, the carbon dioxide reacts according to the Boudouard reaction, as a result of which the CO 2 content decreases and CO increases.…”

Section: Introductionmentioning

confidence: 99%

An exsitu underground coal gasification experiment with a siderite interlayer: course of the process, production gas, temperatures and energy efficiency

Wiatowski

Kapusta

Nowak

et al. 2021

Int J Coal Sci Technol

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A 72-h ex situ hard coal gasification test in one large block of coal was carried out. The gasifying agent was oxygen with a constant flow rate of 4.5 m3/h. The surroundings of coal were simulated with wet sand with 11% moisture content. A 2-cm interlayer of siderite was placed in the horizontal cut of the coal block. As a result of this process, gas with an average flow rate of 12.46 m3/h was produced. No direct influence of siderite on the gasification process was observed; however, measurements of CO2 content in the siderite interlayer before and after the process allow to determine the location of high-temperature zones in the reactor. The greatest influence on the efficiency of the gasification process was exerted by water contained in wet sand. At the high temperature that prevailed in the reactor, this water evaporated and reacted with the incandescent coal, producing hydrogen and carbon monoxide. This reaction contributes to the relatively high calorific value of the resulting process gas, averaging 9.41 MJ/kmol, and to the high energy efficiency of the whole gasification process, which amounts to approximately 70%.

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Section: Introductionmentioning

confidence: 99%

An exsitu underground coal gasification experiment with a siderite interlayer: course of the process, production gas, temperatures and energy efficiency

Wiatowski

Kapusta

Nowak

et al. 2021

Int J Coal Sci Technol

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“…The experiments differed in the methods of coal storage, the use of different oxidants, and the methods of disposal. Experimental coal gasification The operational parameters of the gasifying agent (air or oxygen) have a significant impact on the UCG process efficiency and could also affect its economic performance [23] and gasification indexes including the syngas quality and yield, by regulating its injection method, mixing ratio, and volume to meet different needs [24,25].…”

Section: Methodsmentioning

confidence: 99%

The Usage of UCG Technology as Alternative to Reach Low-Carbon Energy

et al. 2021

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Countries of the European Union have stated transition to carbon-neutral economy until the year of 2050. Countries with a higher share of coal-fired power generation currently have no solution to end their combustion and use clean, emission-free energy immediately. The solution to this problem in the energy industry appears to be the increased use of natural gas, which significantly reduces CO2 emissions. In this article, we investigated the possibility of using coal in situ, using UCG (underground coal gasification) technology. We focused on verified geological, hydrogeological, and tectonic information about the selected brown coal deposit in Slovakia. This information has been assessed in research projects in recent years at the Technical University. From the abovementioned information, possible adverse factors were evaluated. These factors affect the rock environment around the underground generator by UCG activity. As part of the process management, measures were proposed to eliminate the occurrence of pollution and adverse effects on the environment. In the final phase of the UCG technology, we proposed to carry out, in the boreholes and in the generator cavity, water flushing and subsequent grouting. The proposed are suitable materials for solidification and stabilization. Results of this article´s solutions are crucial in the case of usage of this so-called clean technology, not only in Slovakia but also worldwide.

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“…Coal extraction site at Airlaya mine Tanjung Enim, South Sumatera at coordinate point x:363615, y:9583808. The average temperature in Town Site Base Camp (TSBC) Tanjung Enim is between 22° -33° C, with average sunlight radiation of 45%, high humidity, and wind speed between 2.3 km/h -4.5 km/h [5].…”

Section: Research Methods 21 Research Locationmentioning

confidence: 99%

Syngas Underground Coal Gasification (UCG) Testing of Fracture Type Subbituminous Coal in Laboratory Scale

2021

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Underground Coal Gasification is a method used to convert underground coal seams into a gaseous product commonly called synthetic gas through a flammable chemical process without going through a conventional mining process. The UCG concept was first developed in England which was then continued by the Soviet Union in field trials of UCG which was used as a power plant. In Indonesia, Tekmira has begun to research UCG, but there are very few publications on UCG. Therefore, it is necessary to conduct research on laboratory scale UCG for analysis of gas products to support the study of renewable energy. UCG testing begins with sample preparation followed by laboratory-scale coal gasification testing. There is a sample of coal used in the test, namely Subbituminous Coal from Tanjung Enim, South Sumatra. Initial combustion is carried out by flowing propane gas into the reactor tube using a burner. Furthermore, a mixture of oxygen gas and compressed air is used to keep the coals burning. After obtaining the gas from the combustion, then gas sampling is carried out using a suction pump which will be stored in a tedlar gas bag. Combustion gas products will be checked for syngas concentration using a Gas Chromatography tool to determine the concentration of CH4, CO2 and O2 gases. From the tests that have been carried out, the gas concentrations of O2 are 3.67%, CO2 41.51%, and CH4 6.93%. Coal in the confined test conditions has good conditions with indications of seeing the concentration of CH4, O2, and CO2 gas.

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Effect of oxygen and steam on gasification and power generation in industrial tests of underground coal gasification

Cited by 24 publications

References 24 publications

An exsitu underground coal gasification experiment with a siderite interlayer: course of the process, production gas, temperatures and energy efficiency

An exsitu underground coal gasification experiment with a siderite interlayer: course of the process, production gas, temperatures and energy efficiency

The Usage of UCG Technology as Alternative to Reach Low-Carbon Energy

Syngas Underground Coal Gasification (UCG) Testing of Fracture Type Subbituminous Coal in Laboratory Scale

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