Review
Environmental Sciences
Jianhua Zhang, Li Gao, David Bergmann, Tamara Bulatovic, Aravind Surapaneni, Stephen Gray
Summary: Poly- and perfluoroalkyl substances (PFAS) are a group of synthetic organofluorine compounds that have attracted attention due to their toxicity, environmental persistence, bioaccumulation, and widespread presence in the environment. Various treatment methods, including thermal treatment and mineralization, have been developed to address the issues associated with PFAS.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Energy & Fuels
Siqi Liu, Guangqing Zhu, Yanqing Niu, Liping Wen, Yu Lei, Denghui Wang, Shi'en Hui
Summary: This study investigates the relationship between char fragmentation/mineral coalescence and PM formation, finding that char fragmentation significantly increases the number of fine ash particles while dense char structure disadvantages char fragmentation but enhances mineral coalescence. The distribution of fly ash at different temperatures is influenced by the percolation theory, with particles at higher temperatures mainly undergoing perimeter fragmentation. The effect of ash content is more related to the distribution of mineral grains within char particles.
Article
Multidisciplinary Sciences
Han Wang, Wenjing Zhang, Shuwei Qiu, Xiujuan Liang
Summary: The study found that the solid residue after oil shale pyrolysis released harmful substances into groundwater, exceeding China's groundwater quality standards, while biological actions can mitigate this pollution over time.
SCIENTIFIC REPORTS
(2021)
Article
Thermodynamics
Yuan Yao, Aidin Panahi, Martin Schiemann, Yiannis A. Levendis
Summary: This research focuses on the size and overall porosity of carbonaceous chars produced during the pyrolysis and combustion of biomass under high-heating rates and temperatures. The study found that the generated chars were highly porous with large cavities.
COMBUSTION AND FLAME
(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
Energy & Fuels
D. A. Mortari, D. Perondi, G. B. Rossi, J. L. Bonato, M. Godinho, F. M. Pereira
Summary: Water leaching pretreatment effectively removes water-soluble inorganic constituents from RGP and significantly impacts the combustion efficiency of WLGP chars, leading to lower burnout efficiency and increased gas emissions.
Article
Thermodynamics
Brian Y. Lattimer, Elias Bearinger, Steven Wong, Jonathan L. Hodges
Summary: This research investigates the parameters affecting firebrand burning conditions, develops an analytical model to predict firebrand burning, and compares different methods for predicting char oxidation. The model with char oxidation determined using the heat and mass transfer Reynolds analogy provided the most accurate predictions, especially in forced flow conditions.
COMBUSTION AND FLAME
(2022)
Article
Engineering, Environmental
Qingqi Zheng, Dequan Zhang, Peng Fu, Aixia Wang, Yongmei Sun, Zhiyu Li, Qingwen Fan
Summary: Understanding the role of volatile evolving, char structural evolution, and pyrolysis reaction pathway is crucial for effective utilization of lignin through a pyrolysis-based biorefinery approach. Fast pyrolysis of lignin at different temperatures revealed the release characteristics of volatile compounds and their connection with char structure evolution. The results showed that the release of simple substituted aryl compounds was promoted by the cleavage of beta-O-4 and alpha-O-4. The study also found that high temperatures contributed to the formation of aromatic monomers, and the aromaticity can be evaluated based on the atom ratio of H/C and the degree of ring condensation.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Energy & Fuels
F. Cerciello, B. Apicella, C. Russo, L. Cortese, O. Senneca
Summary: The study explores the influence of pressure on the products of fast pyrolysis of a lignocellulosic biomass (Walnut Shells), showing significant changes in combustion pattern and reactivity of chars under different pressure conditions. Raman analysis indicates that graphitic order develops only at high temperature and pressure, with loss of reactivity attributed to changes in internal distribution of char components.
Article
Energy & Fuels
Kiran Raj G. Burra, Xuan Liu, Zhiwei Wang, Jinhu Li, Defu Che, Ashwani K. Gupta
Summary: The study investigates the interactions between biomass and plastic blends during co-pyrolysis, revealing the different effects of volatile-volatile, volatile-feedstock, and volatile-char interactions. Quantified results show significant increases in H-2 yield due to these interactions, providing insight into enhancing synergy and developing sustainable gasifier development.
Article
Green & Sustainable Science & Technology
Yu Lei, Yanqing Niu, Wen 'an Ma, Guangyao Wang, Liping Wen, Haiyu Huang, Shi 'en Hui
Summary: This study investigated the effect of H2O on the formation of ultrafine particulate matter (PM) in an oxy-combustion atmosphere with different O(2) contents. The results showed that as the H2O content increased, the mass and number yield of ultrafine PM initially decreased and then increased, with an inflection point at 5% H2O content. The yield of ultrafine PM in the oxy-combustion atmosphere was more sensitive to H2O when the O(2) content was low.
INTERNATIONAL JOURNAL OF GREENHOUSE GAS CONTROL
(2022)
Article
Energy & Fuels
Mufang Hu, Bo Zhao, Linbo Qin, Geng Chen, Wangsheng Chen, Jun Han
Summary: The fine particles and trace elements from coal combustion have a severe negative effect on the environment and human health. This study investigated the particle size distribution and trace element release during the combustion of blended coal. The results showed that blending coal can reduce PM formation and lower the emission of As, Se, Pb, and Cd. The reduction efficiency of trace elements varied for different particle sizes. Overall, blending coal combustion can effectively reduce the environmental and health risks.
Article
Energy & Fuels
G. Gianfelice, P. Canu
Summary: This study explores the chemical and physical processes within a single wood pellet to improve the design of wood pellet stoves and boilers, revealing that the conversion rate is controlled by heat conduction and is linearly proportional to the surrounding temperature. It also found that at higher combustion temperatures, the char yield decreases and useful heat must be extracted from volatiles combustion.
Article
Thermodynamics
Aoyang Zhang, Xiaowei Liu, Yishu Xu, Tianpeng Zhang, Minghou Xu
Summary: An improved model of fine particulate matter formation, which combines the mechanisms of mineral coalescence and char fragmentation under different pulverized coal combustion environments, has been developed. The model includes a three-dimensional sub-model of char particles and a sub-model of mineral melting coalescence. The model has shown good fitting effects with experimental data and provides a better understanding of the particulate matter formation process.
PROCEEDINGS OF THE COMBUSTION INSTITUTE
(2023)
Article
Chemistry, Multidisciplinary
Yingyue Teng, Xiaoting Bian, Yinmin Song, Bingzhi Wang, Na Li, Runxia He, Yunfei Wang, Quansheng Liu
Summary: This study investigated the effect of the iron component on the microcrystalline structure transformation properties of lignite during pyrolysis. The results showed that the iron component promoted the generation of CO2, CO, and H2 in the low-temperature stage and inhibited the formation of CO and H2 in the high-temperature stage. The iron component also inhibited the formation of CH4 throughout the pyrolysis process. Moreover, it restricted the spatial arrangement of aromatic rings and inhibited the formation of large aromatic rings (≥6 rings).
Article
Thermodynamics
Xujun Chen, Hongwei Wu
PROCEEDINGS OF THE COMBUSTION INSTITUTE
(2019)
Article
Thermodynamics
Chao Feng, Hongwei Wu
PROCEEDINGS OF THE COMBUSTION INSTITUTE
(2019)
Article
Thermodynamics
Xujun Chen, Sui Boon Liaw, Hongwei Wu
PROCEEDINGS OF THE COMBUSTION INSTITUTE
(2019)
Article
Energy & Fuels
Sui Boon Liaw, Hongwei Wu
Article
Energy & Fuels
Changya Deng, Sui Boon Liaw, Hongwei Wu
Article
Energy & Fuels
Song Zhou, Tahereh Hosseini, Jie Zhao, Xiwang Zhang, Hongwei Wu, Lian Zhang
Article
Energy & Fuels
Bing Song, Yun Yu, Hongwei Wu
Review
Agricultural Engineering
Samreen Hameed, Abhishek Sharma, Vishnu Pareek, Hongwei Wu, Yun Yu
BIOMASS & BIOENERGY
(2019)
Article
Energy & Fuels
Mingming Zhang, Hongwei Wu
Article
Energy & Fuels
Qiqing Shen, Sui Boon Liaw, Mario Costa, Hongwei Wu
Article
Thermodynamics
Jinxiu Cao, Sui Boon Liaw, Yu Long, Yun Yu, Hongwei Wu
Summary: This study aims to understand the fundamental reaction mechanisms during fast pyrolysis of acid-impregnated cellulose, showing how different temperatures affect the formation of key compounds in the reaction intermediates and primary volatiles. The results indicate that acid impregnation reduces the onset reaction temperature of cellulose pyrolysis, leading to the production of different major products at varying temperatures. The study also suggests that condensation reactions play an important role during acid-catalysed cellulose pyrolysis, with char formation becoming the favored pathway at higher temperatures.
PROCEEDINGS OF THE COMBUSTION INSTITUTE
(2021)
Article
Thermodynamics
Sui Boon Liaw, Hongwei Wu
Summary: Laboratory-scale experiments on PF combustion are usually conducted in droptube furnaces, investigating the effect of flue gas cooling conditions on PM10 properties from biomass combustion. The study found that cooling rate and biomass feeding rate have significant impacts on particle size and composition, showing different trends in particle diameter and component distribution.
PROCEEDINGS OF THE COMBUSTION INSTITUTE
(2021)
Article
Energy & Fuels
Qiqing Shen, Sui Boon Liaw, Hongwei Wu
Summary: Rapid pyrolysis of mallee and pine wood particles was conducted in a drop-tube furnace to investigate char yield, evolution of AAEM species, and char particle morphology. The results showed that char yield decreased with particle residence time, and mallee wood exhibited stronger resistance to deformation compared to pine wood due to the maintenance of its original elongated shape.