Article
Energy & Fuels
Wei Li, Deepak Pudasainee, Rajender Gupta, Wu Yang, Ben Wang, Lushi Sun
Summary: The research found that controlling the gasification temperature of petroleum coke above 1200 degrees Celsius is beneficial for improving gasification reactivity. Petroleum coke with high ash content promotes the decomposition of functional groups to generate active radicals, thereby increasing active sites.
Article
Chemistry, Analytical
Haigang Zhang, Zhongjie Shen, Zizheng Dong, Yiru Yang, Jianliang Xu, Qinfeng Liang, Haifeng Liu
Summary: This paper investigates the effects of temperature and oxygen content on coal pyrolysis product distribution, char structure, and reactive properties. The results show that higher temperature enhances the release of volatiles and tar cracking, leading to increased gas phase yield and syngas concentration. However, temperatures above 900 degrees Celsius intensify char graphitization, which is not favorable for gasification. Oxygen introduction at 900 degrees Celsius accelerates the release of volatiles and intensifies depolymerization reaction, increasing the gas yields of CO and CO2. The presence of trace oxygen reduces char graphitization and improves gasification reactivity but high oxygen content (8%) leads to combustion on the char surface, destroying its structure and reducing gasification activity.
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
(2023)
Article
Energy & Fuels
Zixin Jiao, Li Liu, Yan Zhao, Xiye Chen, Penghua Qiu
Summary: The study evaluated the cogasification reactivity of Shenmu bituminous coal (SM) char and corn straw (CS) char in CO2 and found that increasing the blend ratio of CS and gasification temperature can weaken inhibition and enhance synergy. The addition of CS volatiles, especially potassium (K), can promote the cogasification reaction, with the promotion effect increasing with temperature. The comparison between CS-SM blend char and CS char volatiles-SM char showed different effects on gasification reactivity depending on the presence of alkali and alkaline earth metals.
Article
Thermodynamics
Xin Yu, Dunxi Yu, Fangqi Liu, Jianqun Wu, Minghou Xu
Summary: This study focused on the pyrolysis behavior of petroleum coke at high temperatures. It found a secondary pyrolysis stage at temperatures above 1300 K and observed the release of gases such as HCN, CO2 and SO2 during this process. The study also highlighted the importance of char thermoplastic state in determining its reactivity towards CO2.
PROCEEDINGS OF THE COMBUSTION INSTITUTE
(2021)
Review
Energy & Fuels
Miao Wang, Yiling Wan, Qinghua Guo, Yonghui Bai, Guangsuo Yu, Yurong Liu, Hong Zhang, Shu Zhang, Juntao Wei
Summary: Petroleum coke and biomass/coal co-gasification is a promising approach for efficiently integrating the individual advantages of different gasification feedstocks with syngas production. Research on syngas production, reactivity characteristics, and synergy behavior of co-gasification is critical. H-2-rich syngas and higher co-gasification reactivity can be acquired under specific conditions, such as high H/C ratio, coal/biomass proportion, gasification temperature, and gasification agent concentration. Synergy behavior in co-gasification shows relationships with free radical migration and AAEMs transfer.
Article
Energy & Fuels
Ming Lei, Cen Sun, Yanchao Zhang
Summary: The study found that pressurized pyrolysis intensified the decomposition of aromatic ring structure and hydroxyl hydrogen bonds in coal char, leading to the formation of low-substituted single rings, as well as shortening of aliphatic chains and carboxyl groups in char. Pressurized pyrolysis also increased the graphitization degree of char and inhibited the decomposition of low-temperature minerals. Furnace temperature had a more significant impact on mineral transformations compared to furnace pressure. Additionally, in pressurized conditions, the primary minerals in coal ash remained consistent but their relative contents changed, with combustion temperature influencing mineral transformations. The mixture of O-2/CO(2) restrained the decomposition of low-temperature minerals and formation of high-temperature minerals, with furnace temperature being the primary factor influencing ash mineral transformations.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2021)
Article
Chemistry, Multidisciplinary
Jiazhuang Tian, Qiuyun Mao, Zihan You, Qifan Zhong
Summary: The removal of environmentally harmful sulfur and nitrogen is crucial for using high-sulfur petroleum coke (petcoke) as fuel. Simulating petcoke gasification with a mixture of two effective gasifiers (CO2 and H2O) revealed the synergistic effect of the mixed agents on gas production. Increasing the content of H2O can boost gas yield and accelerate desulfurization. The gas productivity reached 65.6% when the CO2/H2O ratio was 3:7. Detailed sulfur and nitrogen conversion paths and reaction mechanisms can be captured by simulating the gasification process on a molecular level.
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
Biochemistry & Molecular Biology
Man Zhang, Hongyu Ban, Zhiqing Wang, Xinning Xiang, Xiaolei Wang, Qian Zhang
Summary: The impact of K(2)CO(3) catalyst on the gasification of petroleum coke was studied. The results showed that increasing the amount of K(2)CO(3) greatly reduced the gasification temperatures of the coke. However, beyond a certain concentration of K+, the catalytic reaction became saturated. Further increase in the catalyst did not inhibit the gasification rate. The vaporization of the catalyst was observed during high-temperature gasification. XRD, Raman spectroscopy, and N-2 adsorption analyses revealed that the presence of the catalyst altered the carbon crystallite structure of the residual coke.
Article
Engineering, Environmental
Lei Pang, Yingjuan Shao, Wenqi Zhong, Hao Liu
Summary: Pressurized oxy-coal combustion has potential for high efficiency and low cost CO2 capture. Increased pressure and oxygen concentration reduce burnout time of char particles and improve their reactivity and temperature. A combustion model shows pressure's impact on char burnout time.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Chemistry, Applied
Lin Li, Shuai Tong, Lunbo Duan, Changsui Zhao, Zhipeng Shi
Summary: By comparing chars produced under different atmospheres, it was found that the pore structure and specific surface area of chars are significantly affected by the gasification environment, while the presence of chemical groups has a minor impact on the chars. The best gasification reactivities were obtained on the chars produced under 50%CO2/50%N2 and 50%H2O/50%N2 atmospheres, largely influenced by the porosity of the chars.
FUEL PROCESSING TECHNOLOGY
(2021)
Article
Energy & Fuels
Cheng Ma, Qiuxiang Yao, Yuzhen Zhao, Chong Zou, Junxue Zhao, Zongcheng Miao
Summary: Char gasification allows for the clean and efficient utilization of low-rank coal resources. The CO2 gasification behavior and kinetics of char samples produced under different atmospheric conditions were investigated. The results showed that the physicochemical structure and characteristics of the char samples had a significant impact on the gasification rate and activation energy. The application of a three-dimensional diffusion model provided insights into the CO2 gasification process of coal char.
JOURNAL OF THE ENERGY INSTITUTE
(2023)
Article
Energy & Fuels
Meng Ma, Jiaofei Wang, Yonghui Bai, Peng Lv, Xudong Song, Weiguang Su, Lu Ding, Juntao Wei, Guangsuo Yu
Summary: Volatile-char interactions affect the chemical structure and reactivity of coal char, with O-containing functional groups playing an important role in char reactivity. The decrease in gasification reactivity due to volatile-char interactions is attributed to the decrease in aromatic C-O and C=O, and the increase in graphite carbon structures.
Article
Engineering, Environmental
Song Qianshi, Wang Xiaohan, Li Haowen, Yang Zixin, Ye Yue, Huo Jiepeng
Summary: The study found that the self-developed char reactivity model accurately predicted the reaction rate of char samples under different gasification temperatures, providing a valuable reference for predicting char gasification reaction rate.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Energy & Fuels
Dikun Hong, Liang Liu, Chunbo Wang, Ting Si, Xin Guo
Summary: An atomistic coal char representation was constructed via ReaxFF MD simulation, investigating the combustion and gasification characteristics of the char. The activation energies obtained for various reactions were in good agreement with experimental data, revealing the generation of large amounts of C2 species during char-H2O gasification.
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)