Effect of Injection Flow Rate on Product Gas Quality in Underground Coal Gasification (UCG) Based on Laboratory Scale Experiment: Development of Co-Axial UCG System

Hamanaka, Akihiro; Su, Fa Qiang; Itakura, Kazunori; Takahashi, Kazuhiro; Kodama, Jun; Deguchi, Gota

doi:10.3390/en10020238

Cited by 22 publications

(13 citation statements)

References 22 publications

(25 reference statements)

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“…The gasification process that will be carried out in the UCG prototype is assisted by an injection hole, which will help the combustion process in the soilThe injection condition is one of the key parameters to control the product gas quality in the UCG process [21]. The UCG process involves the reaction of oxygen, air or steam with coal carbon and pyrolysis products [14], because oxygen affects the temperature and pressure in the coal gasification process [13].…”

Section: Introductionmentioning

confidence: 99%

“…The UCG process involves the reaction of oxygen, air or steam with coal carbon and pyrolysis products [14], because oxygen affects the temperature and pressure in the coal gasification process [13]. The higher the oxygen flow rate during the lignite coal gasification process, the higher gasification efficiency is indicated by the increase in reaction temperature and the expansion of the gasification area [21]. However, if there is a decrease in the combustion air flow rate, it will tend to make the combustion temperature smaller which will make the temperature smaller so that the efficiency will also decrease.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Oxygen Flow Rate on Combustion Time and Temperature of Underground Coal Gasification

2021

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Underground Coal Gasification (UCG) is a process of converting coal in the ground into synthetic gas that has economic value. In the UCG process which will be carried out in the UCG prototype assisted by the presence of oxygen as a gasification agent, which this gasification agent will help the process of burning coal in the ground. The flow rate of oxygen in the process of UCG affecting the coal combustion temperature and effective flame from burning coal. The highest temperature at a flow rate of 5 l/min is 240oC, at an oxygen flow rate of 3 l/min the highest temperature is 143oC and at an oxygen flow rate of 2 l/min the highest temperature is 135oC and time effective flame at a flow rate of 5 l / min ie 80 minutes, effective burning time on the speed of the flow rate of 3 l / min ie for 120 minutes and time effective flame at a flow rate of 2 l / min ie for 165 minutes. This study proves that the greater the oxygen flow rate is used as the gasification agent at UCG process the lignite coal combustion temperatures will be high and effective flame coal combustion process will be more brief.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Oxygen Flow Rate on Combustion Time and Temperature of Underground Coal Gasification

2021

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“…Gas concentrations that can be tested using a GC device in the laboratory are CO, CH4, CO2. Based on UCG research conducted in Japan, the gas products produced consist of CO, CH4, CO2, and H2 gas [3][19] [20]. Coal combustion gas products (syngas) from UCG testing can be used for power plants, industrial raw materials, motor vehicle fuels and diesel fuel where previously the gas has been cleaned [4][21]- [24].…”

Section: Introductionmentioning

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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“…From the literature (Shu at al. 2020;Hamanaka at al. 2017), 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 H2 and the lower the concentration of CH4 and CO2 in the process gas.…”

Section: Introductionmentioning

confidence: 99%

An ex Situ Underground Coal Gasification Experiment with a Siderite Interlayer. Course of the Process, Production Gas, Temperatures and Energy Efficiency

Wiatowski

Kapusta

Nowak

et al. 2020

Preprint

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A 72-hour 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 Nm3/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 Nm3/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 allowed 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 contributed 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 amounted to approximately 70%.

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Effect of Injection Flow Rate on Product Gas Quality in Underground Coal Gasification (UCG) Based on Laboratory Scale Experiment: Development of Co-Axial UCG System

Cited by 22 publications

References 22 publications

Effect of Oxygen Flow Rate on Combustion Time and Temperature of Underground Coal Gasification

Effect of Oxygen Flow Rate on Combustion Time and Temperature of Underground Coal Gasification

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

An ex Situ Underground Coal Gasification Experiment with a Siderite Interlayer. Course of the Process, Production Gas, Temperatures and Energy Efficiency

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