Thermal gravimetric study of slag from coal slurry gasification and combustion experiment of rotary combustor
A coal water slurry gasifier cinder was selected as the research subject to investigate its physical properties, including density, particle size and SEM morphology. The influence of temperature, oxygen concentration and heating rate on the combustion characteristics of ash slag was examined through...
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Editorial Department of Coal Science and Technology
2025-06-01
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| Series: | Meitan kexue jishu |
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| Online Access: | http://www.mtkxjs.com.cn/article/doi/10.12438/cst.2024-0769 |
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| author | Long CHEN Yuan ZHANG Naiji WANG Shi YANG |
| author_facet | Long CHEN Yuan ZHANG Naiji WANG Shi YANG |
| author_sort | Long CHEN |
| collection | DOAJ |
| description | A coal water slurry gasifier cinder was selected as the research subject to investigate its physical properties, including density, particle size and SEM morphology. The influence of temperature, oxygen concentration and heating rate on the combustion characteristics of ash slag was examined through thermogravimetric analysis. The burnout duration of ash at various constant temperatures and oxygen concentrations was analyzed. Subsequently, an incineration test for the ash was conducted using a rotating cone burner. The findings indicate that the density of wet ash slag ranges from 620 to 650 kg/m3; decarburized fine slag has a density of 421 kg/m3 while decarburized coarse slag measures 465 kg/m3. The median particle size for dried fine slag is recorded at 33.9 μm, whereas dry coarse slag measures 581 μm. The carbon residue in fine slag exhibits a loose and porous structure conducive to combustion processes. Its ignition temperature varies between 540 and 590℃ with a burnout temperature ranging from 598 to 722 °C. At an oxygen concentration of 22% and a heating rate of 30 K/min, peak weight loss reaches ‒12.3%. The apparent activation energy for fine slag combustion spans from 140 to 230 kJ/mol and increases with rising oxygen concentrations; specifically, when oxygen levels increase from 10% to 16%, combustion time decreases by approximately 23.3% to 29.6%. Pilot test results demonstrate that the rotary combustor effectively combusts and vaporizes fine slag steadily; furthermore, the combustion efficiency exceeds over 90% with residual carbon content in fine slag remaining below 5%. |
| format | Article |
| id | doaj-art-a1a5ff893c124966b40b44bb5b7986bc |
| institution | Kabale University |
| issn | 0253-2336 |
| language | zho |
| publishDate | 2025-06-01 |
| publisher | Editorial Department of Coal Science and Technology |
| record_format | Article |
| series | Meitan kexue jishu |
| spelling | doaj-art-a1a5ff893c124966b40b44bb5b7986bc2025-08-20T03:26:48ZzhoEditorial Department of Coal Science and TechnologyMeitan kexue jishu0253-23362025-06-0153S150851810.12438/cst.2024-07692024-0769Thermal gravimetric study of slag from coal slurry gasification and combustion experiment of rotary combustorLong CHEN0Yuan ZHANG1Naiji WANG2Shi YANG3China Coal Research Institute Company of Energy Conservation, Beijing 100013, ChinaBeijing Tiandi Rongchuang Technology Co. Ltd., Beijing 100013, ChinaBeijing Tiandi Rongchuang Technology Co. Ltd., Beijing 100013, ChinaBeijing Tiandi Rongchuang Technology Co. Ltd., Beijing 100013, ChinaA coal water slurry gasifier cinder was selected as the research subject to investigate its physical properties, including density, particle size and SEM morphology. The influence of temperature, oxygen concentration and heating rate on the combustion characteristics of ash slag was examined through thermogravimetric analysis. The burnout duration of ash at various constant temperatures and oxygen concentrations was analyzed. Subsequently, an incineration test for the ash was conducted using a rotating cone burner. The findings indicate that the density of wet ash slag ranges from 620 to 650 kg/m3; decarburized fine slag has a density of 421 kg/m3 while decarburized coarse slag measures 465 kg/m3. The median particle size for dried fine slag is recorded at 33.9 μm, whereas dry coarse slag measures 581 μm. The carbon residue in fine slag exhibits a loose and porous structure conducive to combustion processes. Its ignition temperature varies between 540 and 590℃ with a burnout temperature ranging from 598 to 722 °C. At an oxygen concentration of 22% and a heating rate of 30 K/min, peak weight loss reaches ‒12.3%. The apparent activation energy for fine slag combustion spans from 140 to 230 kJ/mol and increases with rising oxygen concentrations; specifically, when oxygen levels increase from 10% to 16%, combustion time decreases by approximately 23.3% to 29.6%. Pilot test results demonstrate that the rotary combustor effectively combusts and vaporizes fine slag steadily; furthermore, the combustion efficiency exceeds over 90% with residual carbon content in fine slag remaining below 5%.http://www.mtkxjs.com.cn/article/doi/10.12438/cst.2024-0769coal gasification ashphysical propertiescombustion characteristicskinetic parametersrotary combustor |
| spellingShingle | Long CHEN Yuan ZHANG Naiji WANG Shi YANG Thermal gravimetric study of slag from coal slurry gasification and combustion experiment of rotary combustor Meitan kexue jishu coal gasification ash physical properties combustion characteristics kinetic parameters rotary combustor |
| title | Thermal gravimetric study of slag from coal slurry gasification and combustion experiment of rotary combustor |
| title_full | Thermal gravimetric study of slag from coal slurry gasification and combustion experiment of rotary combustor |
| title_fullStr | Thermal gravimetric study of slag from coal slurry gasification and combustion experiment of rotary combustor |
| title_full_unstemmed | Thermal gravimetric study of slag from coal slurry gasification and combustion experiment of rotary combustor |
| title_short | Thermal gravimetric study of slag from coal slurry gasification and combustion experiment of rotary combustor |
| title_sort | thermal gravimetric study of slag from coal slurry gasification and combustion experiment of rotary combustor |
| topic | coal gasification ash physical properties combustion characteristics kinetic parameters rotary combustor |
| url | http://www.mtkxjs.com.cn/article/doi/10.12438/cst.2024-0769 |
| work_keys_str_mv | AT longchen thermalgravimetricstudyofslagfromcoalslurrygasificationandcombustionexperimentofrotarycombustor AT yuanzhang thermalgravimetricstudyofslagfromcoalslurrygasificationandcombustionexperimentofrotarycombustor AT naijiwang thermalgravimetricstudyofslagfromcoalslurrygasificationandcombustionexperimentofrotarycombustor AT shiyang thermalgravimetricstudyofslagfromcoalslurrygasificationandcombustionexperimentofrotarycombustor |