Article
Energy & Fuels
Bing Xu, Mingkun Yang, Baolin Xing, Faqiang Su, Lunjian Chen, Fan Wang, Yulong Zhang, Guiyun Yi
Summary: Groundwater pollution caused by underground coal gasification (UCG) and its remediation have attracted significant public attention. Model gasification experiments were conducted on different coals with varying coalification degrees, showing higher phenol and Cr (VI) removal rates with UCG residual cokes compared to raw coals. The presence of oxygen-containing groups favored the removal of Cr(VI).
Article
Engineering, Environmental
Jacek Grabowski, Krzysztof Korczak, Aleksandra Tokarz
Summary: The article presents the results of a coal gasification experiment conducted in the Wieczorek Mine, which lasted for 6 months underground and monitored the impact on underground and surface water. The study also included an analysis of water-tar condensates from the gas cleaning system.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2021)
Article
Green & Sustainable Science & Technology
Renato Zagorscak, Richard Metcalfe, Laura Limer, Hywel Thomas, Ni An, Alex Bond, Sarah Watson
Summary: This paper presents a flexible risk assessment methodology for Underground Coal Gasification (UCG) technology, which evaluates potential risks by analyzing various scenarios. The application of a numerical model suggests that the risks of groundwater contamination from a UCG site should be very low if the site is developed and operated appropriately.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Chemistry, Multidisciplinary
Tamara A. Krasnova, Natalia Gora, Oxana Belyaeva, Alena K. Gorelkina, Nadezhda S. Golubeva, Irina Timoshchuk
Summary: This study compares the equilibrium and kinetics of phenol adsorption using commercial activated carbons and semi-cokes, finding differences in their nature and characteristics. Oxidative modification of semi-coke P2 increases its adsorption capacity, making it a promising sorbent for phenol extraction from aqueous media.
Article
Environmental Sciences
Aleksandra Strugala-Wilczek, Wioleta Basa, Krzysztof Kapusta, Karel Soukup
Summary: The study investigates the sorption interactions between phenol and materials obtained from different UCG simulations, finding high removal efficiency for phenol and varying sorption characteristics in different UCG processes. The isotherm models were used to describe the adsorption phenomena, and the results suggest significant delay in the migration of organic pollutants in the environment around UCG reactors.
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
(2021)
Article
Chemistry, Physical
Zhenyong Yin, Hao Xu, Yanpeng Chen, Tiantian Zhao, Jingjie Wu
Summary: Research on hydrogen production from coal gasification focuses on the formation of CO and H2 from coal and water vapor. Pure oxygen-steam gasification is used to improve gasification efficiency. The two-step gasification process involving coal pyrolysis and char gasification is an efficient method for hydrogen production.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Thermodynamics
Huan Liu, Wei Guo, Shuqin Liu
Summary: This study compares the techno-economic performance of UCG-H2 and SCG-H2, and finds that UCG-H2 has lower investment and cost advantages, especially without CCS. However, the economic feasibility of UCG-H2 is challenged when hydrogen market prices are low.
Article
Thermodynamics
Tianhong Zhou, Lichao Ge, Qian Li, Long Yang, Longhui Mai, Jing Huang, Yang Wang, Chang Xu
Summary: Isothermal pyrolysis experiments were conducted to optimize the utilization of petroleum coke. Combustion characteristics and gasification properties of petroleum coke and its semi-coke were investigated. Results showed that gas production increased with higher pyrolysis temperatures. The graphitization degree of semi-coke showed a decreasing and then increasing trend, reaching its lowest at 650 degrees C. Combustion performance improved with increased oxygen concentration, while gasification rate was higher for semi-coke than petroleum coke.
Article
Chemistry, Physical
Zhuoyue Meng, Zhiyuan Yang, Zhiqiang Yin, Yinyan Li, Xiaoqian Ju, Yaqian Yao, Jiang Long
Summary: This study investigated the effect of dispersants on the performance of semi-coke water slurry containing coal slime, finding that sodium lignin sulfonate is the optimal choice for improving slurry properties. The DFT simulation results showed that SLS has the strongest adsorption on kaolinite surface, providing a theoretical basis for the preparation of high-performance slurry fuel.
APPLIED SURFACE SCIENCE
(2021)
Article
Energy & Fuels
Liangliang Jiang, Shanshan Chen, Yanpeng Chen, Zhangxin Chen, Fenjin Sun, Xiaohu Dong, Keliu Wu
Summary: Underground coal gasification (UCG) has the prospect of tapping deep coal seams and reducing carbon emissions. However, there is limited experience in deep UCG development. This study constructed a large-scale 3D UCG model with an improved method and considered the effect of double-diffusive natural convection. The results showed that the improved method was beneficial for the development of UCG cavities in deep coal seams, and double-diffusive natural convection played an important role in cavity development and overall UCG performance.
Article
Thermodynamics
Jun Zhao, Hassan Nasir Mangi, Zhenyue Zhang, Ru'an Chi, Haochen Zhang, Mengyu Xian, Hong Liu, Haibin Zuo, Guangwei Wang, Zhigao Xu, Ming Wu
Summary: This study aimed to utilize low-rank coal and biomass residue in the coking process, and investigated the performance and structural characteristics of the prepared cokes. The results showed that modified coal could improve the quality and caking performance of coke, as well as enhance the gasification performance.
Article
Materials Science, Multidisciplinary
Lei Guo, Tong Zhang, Xiaomin Dai, Baowei Cao, Yunhua Xu, Yonglin Yang
Summary: This study developed an economical and environmentally friendly method for treating phenol-containing wastewater using porous nano-adsorption material (PNAM) prepared from coal gasification fine slag. The effects of adsorbent dosage, temperature, pH, and reaction time on adsorption were investigated, and the adsorption kinetics, thermodynamics, and mechanism were explored. The results showed that PNAM had a high surface area and good adsorption capacity for phenol. This method has potential application in the treatment of phenol-containing wastewater.
MATERIALS RESEARCH EXPRESS
(2023)
Article
Thermodynamics
Lin Xin, Mingyu An, Mingze Feng, Kaixuan Li, Weimin Cheng, Weitao Liu, Xiangming Hu, Zhigang Wang, Limin Han
Summary: This study simulated the pyrolysis process of lump coal in UCG tunnel, showing that with the increase of final pyrolysis temperature, the functional group content of coal samples decreased and the structure became more disordered.
Article
Energy & Fuels
Fa-qiang Su, Tao Zhang, Jun-bo Wu, Qi-chao Deng, Akihiro Hamanaka, Yi-he Yu, Meng-jia Dai, Xiao-long He, Jun-nan Yang
Summary: In this paper, UCG simulation experiments were conducted to investigate the effects of the gasification agent ratio on the composition and calorific value of the product gas. An energy recovery evaluation method and an evaluation model of the underground coal gasification temperature field were established. The results showed that increasing the oxygen concentration improved the calorific value of the produced gas and the energy recovery rate.
Article
Energy & Fuels
Zhongfa Hu, Yangfan Peng, Fenjin Sun, Shanshan Chen, Yuegui Zhou
Summary: Underground coal gasification is a promising technology for converting coal resources into high-quality synthesis gas with low cost. The study found that gasification pressure and temperature have significant effects on the composition of synthesis gas, and increasing the oxygen/steam ratio enhances the contents of H-2 and CH4, as well as the low heating value of the synthesis gas.
Article
Engineering, Environmental
Xingxing Hu, Lingjie Liu, Yanmeng Bi, Lu Li, Chunsheng Qiu, Jingjie Yu, Shaopo Wang
Summary: In this study, the impact of exogenous folate on the start-up process of single-stage partial nitritation-anammox (SPNA) was evaluated using two lab-scale reactors. The results showed that folate addition can enhance nitrogen removal rate, extracellular polymeric substances production, hydrazine oxidase and dehydrogenase activity, as well as the relative abundance of Candidatus Brocadia.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2024)
Article
Engineering, Environmental
Shaocang He, Tingting Shen, Jing Sun, Haoqi Pan, Chenxu Sun, Tianpeng Li, Runyao Li, Enshan Zhang
Summary: A novel process of acid leaching neutralization was developed for the preparation of inorganic polymeric composite ferric aluminum silicate coagulant (CFAS) using solid waste coal gasification coarse slag (CGCS). The optimized preparation process was determined through single-factor experiment and the performance of CFAS was evaluated for domestic sewage treatment. The results showed that CFAS exhibited excellent coagulation ability and achieved significant removal efficiency for turbidity, ammonia nitrogen, and chemical oxygen demand.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2024)
Article
Engineering, Environmental
Kinga Szatmari, Sandor Nemeth, Alex Kummer
Summary: In this article, a resilience-based reinforcement learning approach is proposed to address the potential thermal runaway issue in batch reactors. By calculating the resilience metric for reactors and utilizing Deep Q-learning to decide when to intervene in the system, resilient-based mitigation systems can be effectively developed.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2024)
Article
Engineering, Environmental
Bingyou Jiang, Qi Yao, Mingqing Su, Jingjing Li, Kunlun Lu, Dawei Ding, Han Hong
Summary: This study investigates the inhibitory characteristics and mechanisms of ABC powder on coal powder explosion. The addition of ABC powder significantly decreases the maximum explosion pressure and can completely suppress coal dust explosions. The study also reveals the thermal decomposition characteristics and reaction kinetics of the mixed system.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2024)
Article
Engineering, Environmental
Kubilay Bayramoglu, Mustafa Nuran
Summary: This study examines the feasibility of using pyrolytic oil from waste tires as fuel in diesel engines, and evaluates its energy, exergy, and sustainability. The results indicate that pyrolytic oil has potential as a renewable fuel source with relatively high thermal efficiency.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2024)
Article
Engineering, Environmental
Xinru Duan, Yejia Lv, Jiaxing Hong, Jianzhong Wu, Jia Zhang, Yang Yue, Guangren Qian
Summary: This study successfully prepared a tube reactor with optimized catalyst formula, which showed good performance in removing dioxins and other pollutants in the experiments.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2024)
Article
Engineering, Environmental
Jiaoyang Du, Xueming Dang, Xiaorong Gan, Xin Cui, Huimin Zhao
Summary: In this study, a photocatalyst-enzyme hybrid system was constructed, which solved the issue of enzyme inactivation caused by high concentration of H2O2 through photocatalytic in-situ H2O2 production, and improved the stability and catalytic efficiency of the enzyme. The effectiveness of the system in treating phenolic EDCs was confirmed through experiments.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2024)
Article
Engineering, Environmental
Fu-Rong Xiu, Longsheng Zhan, Yingying Qi, Xinyue Lei, Jiali Wang, Haipeng Zhou, Wenting Shao
Summary: This study developed a synergetic and high-efficiency treatment of waste tantalum capacitors (WTCs) and polyvinyl chloride (PVC) using subcritical water process. The treatment significantly reduced the temperature and reaction time for metal tantalum recovery from WTCs, and improved the dechlorination efficiency of PVC. The optimized conditions resulted in 100% resin conversion efficiency of WTCs and 97.39% dechlorination efficiency of PVC. The interaction between decomposition products of WTCs and PVC produced a high level of benzoic acid.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2024)
Article
Engineering, Environmental
Bingda Li, Jiaming Song, Yuting Li, Chaoying Meng, Shuxian Wang, Linghao Zong, Honggang Ye, Yishuai Jing, Feng Teng, Peng Hu, Haibo Fan, Guangde Chen, Xin Zhao
Summary: CdPS3 nanosheets, especially those exfoliated by sodium cholate, have shown highly efficient photocatalytic degradation performance. The strong dark adsorption and dye-sensitized photocatalytic properties of CdPS3 nanosheets contribute to high degradation efficiencies of various pollutants.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2024)
Article
Engineering, Environmental
Dongxu Ouyang, Yimei Pang, Bo Liu, Zhirong Wang
Summary: This study investigates the thermal runaway features of lithium-ion cells under tunnel conditions, considering different states of charge and tunnel ceilings. The results show that the tunnel visibility is affected by the smoke generated during thermal runaway, and the shape of the tunnel ceiling influences the temperature rise differently.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2024)