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To improve the quality of low-rank coal to meet requirements of blast furnace, hydrothermal carbonization (HTC) was used to treat low-rank coal to analyze the change rule of physicochemical properties, structural characteristics and combustion performance. Results showed that with an increase in HTC temperature, the calorific value increased from 25.29 to 28.85 MJ/kg. The ash content dropped from 11.74 of raw coal to 7.16. In addition, the atomic ratio of O/C and H/C decreased from 0.21 and 0.79 to 0.12 and 0.56, respectively. Structural analysis revealed that the aromaticity was improved, but the aliphatic carbon content reduced. The coal property was closer to bituminous coal with medium metamorphic degree. The carbon ordering degree also increased, indicating an increase in energy density. Combustion and kinetic analyses showed that with an increase in HTC temperature, compared with raw coal, the combustion curve first moved to the low temperature zone and then gradually shifted to the high temperature zone. Furthermore, the comprehensive combustion characteristics were improved. And the burnout time, which had a certain relationship with ash removal, was shortened. The average reaction activation energies all showed a trend of increasing first and then decreasing, with a range between 114.2 and 147.6 kJ/mol.
Nan Zhang; Guangwei Wang; Chunmei Yu; Jianliang Zhang; Han Dang; Cuiliu Zhang; Xiaojun Ning; Chuan Wang. Physicochemical structure characteristics and combustion kinetics of low-rank coal by hydrothermal carbonization. Energy 2021, 238, 121682 .
AMA StyleNan Zhang, Guangwei Wang, Chunmei Yu, Jianliang Zhang, Han Dang, Cuiliu Zhang, Xiaojun Ning, Chuan Wang. Physicochemical structure characteristics and combustion kinetics of low-rank coal by hydrothermal carbonization. Energy. 2021; 238 ():121682.
Chicago/Turabian StyleNan Zhang; Guangwei Wang; Chunmei Yu; Jianliang Zhang; Han Dang; Cuiliu Zhang; Xiaojun Ning; Chuan Wang. 2021. "Physicochemical structure characteristics and combustion kinetics of low-rank coal by hydrothermal carbonization." Energy 238, no. : 121682.
Basic property analysis is the most comprehensive evaluation of metallurgical characteristics of blast furnace injection fuel. In this study, the basic properties of 16 types of pyrolysis biomass char samples were comprehensively investigated; the results showed that components harmful to a blast furnace, such as the ash content and alkali metal content of Jiangsu Suzhou woodblock char (B3), Jiangsu Changzhou branch char (B8), Jiangsu Zhangjiagang bamboo char (B10), and Jiangsu Zhangjiagang coconut shell char (B12) in all of the biomass char samples, are lower and close to the level of blast furnace injection bituminous coal. The grindability, particle size distribution, and safety all met the requirements of the blast furnace. Among them, the ash melting characteristic temperature of B3, B8, Jiangsu Zhangjiagang rice husk char (B11), and Shanghai soil remediation agent (B16) was greater than 1250 °C, indicating that they are not easy to block the blast furnace raceway and spray guns. Most of the biomass char samples had good combustibility, and the burnout temperature was less than 700 °C. A self-developed blast furnace injection combustion simulation experimental device was used to simulate the combustion behavior of biomass char in the blast furnace raceway tuyere, and the burnout rates of 16 biomass chars were measured. The results showed that that the burnout rate is related to both the volatiles and fixed carbon and the influence of volatiles on the burnout rate is greater than that of fixed carbon. The burnout rates of B3 and B8 were 77.12 and 67.03%, respectively. Above all, B3 and B8 showed good properties, but the burnout rate of B3 was higher, so B3 had the feasibility of applying to blast furnace injection, which indicates that woodblock char has the potential to be used as blast furnace injection fuel.
Han Dang; Guangwei Wang; Chen Wang; Xiaojun Ning; Jianliang Zhang; XiaoMing Mao; Nan Zhang; Chuan Wang. Comprehensive Study on the Feasibility of Pyrolysis Biomass Char Applied to Blast Furnace Injection and Tuyere Simulation Combustion. ACS Omega 2021, 6, 20166 -20180.
AMA StyleHan Dang, Guangwei Wang, Chen Wang, Xiaojun Ning, Jianliang Zhang, XiaoMing Mao, Nan Zhang, Chuan Wang. Comprehensive Study on the Feasibility of Pyrolysis Biomass Char Applied to Blast Furnace Injection and Tuyere Simulation Combustion. ACS Omega. 2021; 6 (31):20166-20180.
Chicago/Turabian StyleHan Dang; Guangwei Wang; Chen Wang; Xiaojun Ning; Jianliang Zhang; XiaoMing Mao; Nan Zhang; Chuan Wang. 2021. "Comprehensive Study on the Feasibility of Pyrolysis Biomass Char Applied to Blast Furnace Injection and Tuyere Simulation Combustion." ACS Omega 6, no. 31: 20166-20180.
A six day industrial trial using hydrochar as part of the carbon source for hot metal production was performed in a production blast furnace (BF). The hydrochar came from two types of feedstocks, namely an organic mixed biosludge generated from pulp and paper production and an organic green waste residue. These sludges and residues were upgraded to hydrochar in the form of pellets by using a hydrothermal carbonization (HTC) technology. Then, the hydrochar pellets were pressed into briquettes together with commonly used briquetting material (in-plant fines such as fines from pellets and scraps, dust, etc. generated from the steel plant) and the briquettes were top charged into the blast furnace. In total, 418 tons of hydrochar briquettes were produced. The aim of the trials was to investigate the stability and productivity of the blast furnace during charging of these experimental briquettes. The results show that briquettes containing hydrochar from pulp and paper industries waste and green waste can partially be used for charging in blast furnaces together with conventional briquettes. Most of the technological parameters of the BF process, such as the production rate of hot metal (<1.5% difference between reference days and trial days), amount of dust, fuel rate and amount of injected coal, amount of slag, as well as contents of FeO in slag and %C, %S and %P in the hot metal in the experimental trials were very similar compared to those in the reference periods (two days before and two days after the trials) without using these experimental charge materials. Thus, it was proven that hydrochar derived from various types of organic residues could be used for metallurgical applications. While in this trial campaign only small amounts of hydrochar were used, nevertheless, these positive results support our efforts to perform more in-depth investigations in this direction in the future.
Tova Jarnerud; Andrey Karasev; Chuan Wang; Frida Bäck; Pär Jönsson. Utilization of Organic Mixed Biosludge from Pulp and Paper Industries and Green Waste as Carbon Sources in Blast Furnace Hot Metal Production. Sustainability 2021, 13, 7706 .
AMA StyleTova Jarnerud, Andrey Karasev, Chuan Wang, Frida Bäck, Pär Jönsson. Utilization of Organic Mixed Biosludge from Pulp and Paper Industries and Green Waste as Carbon Sources in Blast Furnace Hot Metal Production. Sustainability. 2021; 13 (14):7706.
Chicago/Turabian StyleTova Jarnerud; Andrey Karasev; Chuan Wang; Frida Bäck; Pär Jönsson. 2021. "Utilization of Organic Mixed Biosludge from Pulp and Paper Industries and Green Waste as Carbon Sources in Blast Furnace Hot Metal Production." Sustainability 13, no. 14: 7706.
In order to clarify the conversion mechanism and gasification performance of biomass char during the hydrothermal carbonization (HTC) process, and expand the application field of biomass hydrochar, the physicochemical characteristics and gasification performance of corn cob (CC) and CC hydrochar products were systematically studied. The results show that with the increase of HTC temperature, the mass yield (MY) of CC hydrochar decreases, the high heating value (HHV) increases, and the physicochemical properties of CC are significantly improved. In addition, the gasification reaction time of hydrochar increases with the increase of HTC temperature. When the HTC temperature exceeds 280°C, the temperature is no longer the main factor affecting the MY of the hydrochar. The volume model has a good fitting result on the gasification process of CC hydrochar. The apparent activation energy of the gasification reaction of the samples is calculated in the range of 380.99-610.82kJ/mol. HTC can efficiently convert biomass into solid fuel with high energy density, which provides a reliable theoretical basis for expanding the application field of the biomass hydrochar.
Wang Liang; Guangwei Wang; Kexin Jiao; Xiaojun Ning; Jianliang Zhang; Xingmin Guo; Jinhua Li; Chuan Wang. Conversion mechanism and gasification kinetics of biomass char during hydrothermal carbonization. Renewable Energy 2021, 173, 318 -328.
AMA StyleWang Liang, Guangwei Wang, Kexin Jiao, Xiaojun Ning, Jianliang Zhang, Xingmin Guo, Jinhua Li, Chuan Wang. Conversion mechanism and gasification kinetics of biomass char during hydrothermal carbonization. Renewable Energy. 2021; 173 ():318-328.
Chicago/Turabian StyleWang Liang; Guangwei Wang; Kexin Jiao; Xiaojun Ning; Jianliang Zhang; Xingmin Guo; Jinhua Li; Chuan Wang. 2021. "Conversion mechanism and gasification kinetics of biomass char during hydrothermal carbonization." Renewable Energy 173, no. : 318-328.
A type of calcium coke was developed for use in the oxy-thermal process of calcium carbide production. The calcium coke was prepared by the co-pyrolysis of coking coal and calcium carbide slag, which is a solid waste generated from the chlor-alkali industry. The characteristics of the calcium cokes under different conditions were analyzed experimentally and theoretically. The results show that the thermal strength of calcium coke increased with the increase in the coking coal proportion, and the waterproof property of calcium coke also increased with increased carbonation time. The calcium coke can increase the contact area of calcium and carbon in the calcium carbide production process. Furthermore, the pore structure of the calcium coke can enhance the diffusion of gas inside the furnace, thus improving the efficiency of the oxy-thermal technology.
Xu-Zhong Gong; Jun-Qiang Zhang; Zhi Wang; Dong Wang; Jun-Hao Liu; Xiao-Dong Jing; Guo-Yu Qian; Chuan Wang. Development of calcium coke for CaC2 production using calcium carbide slag and coking coal. International Journal of Minerals, Metallurgy and Materials 2020, 28, 76 -87.
AMA StyleXu-Zhong Gong, Jun-Qiang Zhang, Zhi Wang, Dong Wang, Jun-Hao Liu, Xiao-Dong Jing, Guo-Yu Qian, Chuan Wang. Development of calcium coke for CaC2 production using calcium carbide slag and coking coal. International Journal of Minerals, Metallurgy and Materials. 2020; 28 (1):76-87.
Chicago/Turabian StyleXu-Zhong Gong; Jun-Qiang Zhang; Zhi Wang; Dong Wang; Jun-Hao Liu; Xiao-Dong Jing; Guo-Yu Qian; Chuan Wang. 2020. "Development of calcium coke for CaC2 production using calcium carbide slag and coking coal." International Journal of Minerals, Metallurgy and Materials 28, no. 1: 76-87.
In order to clarify the reaction mechanism of co-gasification of biomass char and semi-coke, the gasification properties of bamboo reed char (BR), semi-coke (SC) and their blends were systematically studied by the non-isothermal thermogravimetry. The physicochemical properties of BR and SC were characterized in detail, the main factors affecting the co-gasification reaction were studied, and the gasification kinetics under CO2 environment were further investigated. The results show that the gasification reactivity of SC is lower than BR, which is due to the higher order degree of carbonaceous structure and the lower alkali metal content in the ash, and the addition of BR can significantly improve the gasification reaction performance. Meanwhile, the synergistic effect between BR and SC was evidenced by the experimental and theoretical results. The gasification process of different chars was described with three typical kinetic models: unreacted core model (URCM), volumetric model (VM) and random pore model (RPM). The findings show that the performance of RPM is better than URCM and VM, and there is a significant kinetic compensation effect in the co-gasification reaction of BR and SC through kinetic fitting.
Wang Liang; Xiaojun Ning; Guangwei Wang; Jianliang Zhang; Rongpeng Li; Weiwei Chang; Chuan Wang. Influence mechanism and kinetic analysis of co-gasification of biomass char and semi-coke. Renewable Energy 2020, 163, 331 -341.
AMA StyleWang Liang, Xiaojun Ning, Guangwei Wang, Jianliang Zhang, Rongpeng Li, Weiwei Chang, Chuan Wang. Influence mechanism and kinetic analysis of co-gasification of biomass char and semi-coke. Renewable Energy. 2020; 163 ():331-341.
Chicago/Turabian StyleWang Liang; Xiaojun Ning; Guangwei Wang; Jianliang Zhang; Rongpeng Li; Weiwei Chang; Chuan Wang. 2020. "Influence mechanism and kinetic analysis of co-gasification of biomass char and semi-coke." Renewable Energy 163, no. : 331-341.
The aim of this paper was to investigate the characterized hydrochar of maize straw prepared via the hydrothermal carbonization (HTC) process as a solid fuel for blast furnace injection. The effect of HTC conditions on the yield, physicochemical properties and combustion reactivity of hydrochar were evaluated by varying the HTC temperature over the range of 220–340 °C and the HTC time over the range of 15–120 min. The results showed that with the increase in HTC temperature and time, the yields, H/C and O/C values of hydrochar decreased, and the higher heating value increased. These characteristic changes in hydrochar are similar to those in bituminous coal because of dehydration and decarboxylation. The physicochemical properties and structure analyses showed that the specific surface area increased first and then decreased; meanwhile, the CC, CO and aromatic functional groups gradually increased. The carbonaceous structure of hydrochar became more compact, orderly and stable. Compared to the feedstock of maize straw, the combustion of hydrochar was expected to have higher ignition energy and become more stable with its higher ordering degree of the carbonaceous structure. HTC could be used as an effective method to convert maize straw biomass to a high quality solid injection fuel for the blast furnace.
Guangwei Wang; Jianliang Zhang; Jui-Yuan Lee; XiaoMing Mao; Lian Ye; Wanren Xu; Xiaojun Ning; Nan Zhang; Haipeng Teng; Chuan Wang. Hydrothermal carbonization of maize straw for hydrochar production and its injection for blast furnace. Applied Energy 2020, 266, 114818 .
AMA StyleGuangwei Wang, Jianliang Zhang, Jui-Yuan Lee, XiaoMing Mao, Lian Ye, Wanren Xu, Xiaojun Ning, Nan Zhang, Haipeng Teng, Chuan Wang. Hydrothermal carbonization of maize straw for hydrochar production and its injection for blast furnace. Applied Energy. 2020; 266 ():114818.
Chicago/Turabian StyleGuangwei Wang; Jianliang Zhang; Jui-Yuan Lee; XiaoMing Mao; Lian Ye; Wanren Xu; Xiaojun Ning; Nan Zhang; Haipeng Teng; Chuan Wang. 2020. "Hydrothermal carbonization of maize straw for hydrochar production and its injection for blast furnace." Applied Energy 266, no. : 114818.
In this study, hydrothermal carbonization (HTC) was used to convert waste polyvinyl chloride to produce hydrochar by evaluating its physiochemical, structural and combustion properties for use as a solid fuel. The results showed that the yield, H/C and O/C atomic ratio of hydrochars decreased with the increase of HTC temperature, meanwhile the higher heating value increased. From physiochemical property analysis, hydrochars had more abundant pore structure and higher ordering degree of carbonaceous due to elimination, aromatization and polymerization reaction during HTC process. The combustion and kinetic analysis results show that the hydrochar obtained at the HTC temperature of 250 °C and time of 60 min had the best combustion reactivity. The activation energy calculated by KAS and OFW methods were similar, and the average activation energy of hydrochars calculated by KAS method ranged from 124.8 kJ/mol to 234.7 kJ/mol.
Xiaojun Ning; Haipeng Teng; Guangwei Wang; Jianliang Zhang; Nan Zhang; Chunchao Huang; Chuan Wang. Physiochemical, structural and combustion properties of hydrochar obtained by hydrothermal carbonization of waste polyvinyl chloride. Fuel 2020, 270, 117526 .
AMA StyleXiaojun Ning, Haipeng Teng, Guangwei Wang, Jianliang Zhang, Nan Zhang, Chunchao Huang, Chuan Wang. Physiochemical, structural and combustion properties of hydrochar obtained by hydrothermal carbonization of waste polyvinyl chloride. Fuel. 2020; 270 ():117526.
Chicago/Turabian StyleXiaojun Ning; Haipeng Teng; Guangwei Wang; Jianliang Zhang; Nan Zhang; Chunchao Huang; Chuan Wang. 2020. "Physiochemical, structural and combustion properties of hydrochar obtained by hydrothermal carbonization of waste polyvinyl chloride." Fuel 270, no. : 117526.
The co-gasification characteristics of petroleum coke (PC), hydrochar (PS), and their blends with different ratios were studied by using thermogravimetric analysis. The Coats–Redfern model was employed to calculate the gasification activation energies of different samples. The results manifested that the gasification process of PS and blends could be classified into two stages: pyrolysis and char gasification, but for PC, there was only one primary char gasification stage. The activation energy of the pyrolysis stage was significantly smaller than the char gasification stage. In the latter stage, with the increase in the ratio of PS from 20% to 80%, the activation energy was reduced from 114.1 kJ/mol to 82.8 kJ/mol, which indicated that the PS had a significant promoting influence on the PC gasification. The research results can provide a theoretical guiding significance for the efficient use of PS and PC.
Nan Zhang; Xiaojun Ning; Guangwei Wang; Jianliang Zhang; Jian Guo; Yanjiang Li; Wang Liang; Chuan Wang. Co-gasification of Hydrochar and Petroleum Coke Blended With Different Ratios. Journal of Energy Resources Technology 2020, 142, 1 -24.
AMA StyleNan Zhang, Xiaojun Ning, Guangwei Wang, Jianliang Zhang, Jian Guo, Yanjiang Li, Wang Liang, Chuan Wang. Co-gasification of Hydrochar and Petroleum Coke Blended With Different Ratios. Journal of Energy Resources Technology. 2020; 142 (5):1-24.
Chicago/Turabian StyleNan Zhang; Xiaojun Ning; Guangwei Wang; Jianliang Zhang; Jian Guo; Yanjiang Li; Wang Liang; Chuan Wang. 2020. "Co-gasification of Hydrochar and Petroleum Coke Blended With Different Ratios." Journal of Energy Resources Technology 142, no. 5: 1-24.
Various factors affecting the high temperature compressive strength (TCS) for the carbide slag-based CaO pellets were systematically examined both experimentally and theoretically. It showed that the spherical CaO particles with microstructure can enhance the TCS of the pellets, and the higher the spheroidization of the particles, the higher the TCS. Inducing H3BO3 can lead to a low-temperature nucleation of CaO particle, inhibit the growth of CaO grain, and thus form spherical CaO particles. The TCS of CaO pellet from Ca(OH)2 was optimized with the response surface methodology with a highest value of 37.4 MPa. For the CaO pellet from the carbide slag, the TCS under optimal conditions was 39.67 MPa. However, it was found out that an excess of H3BO3 inducer in the CaO pellets from the carbide slag could produce eutectic calcium borate with a low melting point, resulting in a decreased TCS.
Junqiang Zhang; Xuzhong Gong; Zhi Wang; Junhao Liu; Yanguang Chen; Dong Wang; Guoyu Qian; Chuan Wang. Inducible regulation of spherical CaO particle for the recycling of carbide slag. Powder Technology 2019, 362, 671 -679.
AMA StyleJunqiang Zhang, Xuzhong Gong, Zhi Wang, Junhao Liu, Yanguang Chen, Dong Wang, Guoyu Qian, Chuan Wang. Inducible regulation of spherical CaO particle for the recycling of carbide slag. Powder Technology. 2019; 362 ():671-679.
Chicago/Turabian StyleJunqiang Zhang; Xuzhong Gong; Zhi Wang; Junhao Liu; Yanguang Chen; Dong Wang; Guoyu Qian; Chuan Wang. 2019. "Inducible regulation of spherical CaO particle for the recycling of carbide slag." Powder Technology 362, no. : 671-679.