Article
Thermodynamics
Peng Ma, Qian Huang, Tong Si, Yuanping Yang, Shuiqing Li
Summary: This paper demonstrates the feasibility of co-firing ammonia with coal and biomass in a 25-kW down-fired furnace. The study finds that controlling the ammonia ratio and increasing the secondary air ratio can reduce NOx emissions and unburnt carbon, as well as alleviate ash-related issues. This provides a theoretical basis for the application of ammonia co-firing.
PROCEEDINGS OF THE COMBUSTION INSTITUTE
(2023)
Article
Energy & Fuels
Jingkun Han, Dunxi Yu, Jianqun Wu, Xin Yu, Fangqi Liu, Minghou Xu
Summary: Torrefaction has different effects on the ash slagging behavior during biomass and coal co-combustion. Co-firing biomass with high-Ca coal reduces the ash slagging rate, while co-firing biomass with high-Si/Al coal exacerbates the slagging tendency. Torrefaction can reduce the ash slagging rate of sawdust but increase it for other fuels. Measures such as optimizing operation conditions, co-firing with high-Ca coals, and using additives are suggested to alleviate the ash slagging during torrefied herbaceous biomass combustion.
Article
Thermodynamics
Pedro Abelha, Simon Leiser, Jan R. Pels, Mariusz K. Cieplik
Summary: This study demonstrates the benefits of upgrading biomass through combustion experiments. It shows that upgrading biofuels can reduce NOX formation and improve combustion properties. Washing is crucial in reducing aerosol formation and corrosion risks.
Article
Thermodynamics
Hariana, Hanafi Prida Putra, Prabowo, Edi Hilmawan, Arif Darmawan, Keiichi Mochida, Muhammad Aziz
Summary: This study investigated the potential slagging and fouling when co-firing coal with different biomasses and found that co-firing coal with palm oil empty fruit bunch-frond, wood chip, or rice husk at a 25% blend offered similar combustion characteristics, gas emissions, ash deposits, and mineralogy. Co-firing with less than 25% solid recovered fuel requires further investigation to mitigate the slagging and fouling tendency. These findings are important for identifying suitable biomass fuels for co-firing with coal in power plants.
Article
Energy & Fuels
Tao Liu, Sheng Wang, Ziming Wei, Jie Yu
Summary: In this study, a new combustion system was proposed to solve the problem of high NOx emissions from a down-fired boiler. The system effectively controlled NO emissions but resulted in an increase in the carbon content of fly ash. Further research is needed to reduce the carbon content in fly ash.
Article
Energy & Fuels
Xiaoyu Zhang, Yuzhong Li, Lu Wang, Zhuping Zhang, Yong Dong
Summary: This study found that adding an appropriate amount of biomass to pulverized coal can effectively inhibit the production of coal-fired condensable particulate matter. Cornstalk showed the most significant inhibitory effect on CPM, with an addition ratio of around 30%. Additionally, adding cornstalk was also found to decrease the content of certain components in CPM and efficiently reduce the amount of aromatic compounds, the substances with the highest toxicity levels in CPM, at an approximate addition ratio of 30%.
Article
Energy & Fuels
Xin Zhang, Zhichao Chen, Mingdi Zhang, Lingyan Zeng, Zhengqi Li
Summary: When burning coal for electricity generation under low load conditions, bituminous coal exhibits better combustion stability compared to anthracite, with shorter ignition distance, higher furnace temperature, and lower NOx emissions at the furnace exit.
Article
Engineering, Environmental
Xinguang Huo, Xiangru Jia, Changzhong Song, Feng Yun, Songtao Hao, Yaqian Ding, Shaoqing Liu, Mingzhuang Lei
Summary: The co-combustion of coal gangue and biomass can increase the utilization rate of solid waste and improve the burn-out effect of coal gangue. By blending with biomass, it can reduce NO emissions and prevent biomass slagging phenomenon.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Energy & Fuels
Lun Ma, Anli Zhou, Qingyan Fang, Cheng Zhang, Yuan Li, Xinping Zhao, Rui Mao, Liming Ren
Summary: A comprehensive study was conducted on the combustion characteristics, slagging potential, and NOx emissions of cofiring coal slime and anthracite in a 600MW down-fired utility boiler. The results showed that there are combustion interactions between the two fuels, with the inhibitive effect being greater than the promotive effect when the blending ratio of coal slime is above 5%. The addition of coal slime effectively improves the ash fusion temperature of blended samples.
JOURNAL OF ENERGY ENGINEERING
(2023)
Article
Energy & Fuels
Tianyi Wang, Xi Chen, Wenqi Zhong
Summary: This paper proposes a method for predicting slagging distribution and optimizing anti-slagging in a 330 MW tangentially coal-fired boiler. The method uses proper orthogonal decomposition (POD) and support vector machine (SVM) to predict temperature and O2 distribution near the water wall, and fuzzy comprehensive evaluation (FCE) to quantify the slagging occurrence and distribution. Real-time slagging prediction is achieved with the combination of POD, SVM, and FCE. The air distribution schemes and coal blending schemes are optimized using genetic algorithms to reduce the slagging ratio.
Article
Green & Sustainable Science & Technology
Yoonah Jeong, Jae-Sung Kim, Ye-Eun Lee, Dong-Chul Shin, Kwang-Ho Ahn, Jinhong Jung, Kyeong-Ho Kim, Min-Jong Ku, Seung-Mo Kim, Chung-Hwan Jeon, I-Tae Kim
Summary: Utilizing food waste as a renewable biomass resource in coal-fired power plants has great potential. Co-combustion of food waste biochar (FWB) with coal reduces emissions and improves combustion efficiency, while showing lower tendencies for ash deposition. Moreover, FWB has superior grindability, leading to reduced power consumption during fuel preparation.
Article
Engineering, Multidisciplinary
Hariana, Prabowo, Edi Hilmawan, Fairuz Milky Kuswa, Arif Darmawan, Muhammad Aziz
Summary: This paper comprehensively investigates the combustion performances and slagging and fouling behaviors during cofiring biomass and coal. The results show that cofiring coal with 25% biomass has the best combustion performance.
AIN SHAMS ENGINEERING JOURNAL
(2023)
Article
Thermodynamics
Jinyu Sun, Xiaojun Zhao, Dongfa Xue
Summary: In this study, a CFD simulation was conducted to investigate the impact of biomass co-firing with coal in a 300 MW pulverized coal boiler. The results showed that biomass co-firing reduced peak temperatures, improved temperature distribution, decreased unburned carbon concentration, and significantly reduced nitrogen oxide emissions. Furthermore, co-firing biomass with coal reduced the risk of biomass spontaneous combustion while maintaining combustion stability and efficiency.
Article
Thermodynamics
Zhichao Chen, Zhenhua Yuan, Bo Zhang, Yanyu Qiao, Jiawei Li, Lingyan Zeng, Zhengqi Li
Summary: The study investigated the effects of the ratio of the inner to the outer secondary air mass flow rates on the slagging characteristics of a pulverized coal-fired boiler. The results showed that increasing the ratio can reduce slagging and improve the safe and stable operation of the boiler.
Article
Chemistry, Analytical
Chunxiang Chen, Yingxin Bi, Yuting Huang, Haozhong Huang
Summary: This study evaluated various methods for assessing slagging tendencies in biomass combustion, analyzed the advantages and disadvantages of each method, and discussed the future trends in research for evaluating slagging tendencies in biomass fuels.
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
(2021)
Article
Chemistry, Multidisciplinary
Heng Zhao, Jingwei Xue, Hongbo Wu, Baojun Lin, Yuhang Cai, Ke Zhou, Daqin Yun, Zheng Tang, Wei Ma
Summary: The power conversion efficiency of organic solar cells has reached high values, but current fabrication methods using toxic solvents and limited photoactive layer thickness restrict their practical development. This study successfully fabricated high-efficiency, thick-film organic solar cells using non-halogenated solvents and hot slot-die coating technique, leading to the industrial development of organic solar cells.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Thermodynamics
Yize Zhang, Mingrui Zhang, Hao Zhou
Summary: The reduced inlet flue gas temperature of the selective catalytic reduction (SCR) denitrification device is a significant problem during the low-load operation of boilers. This study investigates the thermal mixing method in bypass flue gas technology and the effect of temperature difference and flow rate variation on the thermal mixing characteristics. Experimental measurements and simulations indicate that a combined tube wall jet and bottom jet method provides the highest warming effect and lowest mixing non-uniformity parameter. The study provides insights for ensuring the safe and stable operation of SCR denitrification system during low-load operation of coal-fired boilers.
APPLIED THERMAL ENGINEERING
(2023)
Article
Engineering, Chemical
Hanxiao Meng, Jiankang Wang, Xue Xue, Shengyao Huang, Hao Zhou
Summary: The combustion behavior of quasi-particles, the basic unit of iron ore sintering bed, was analyzed using different fuels and ores. The results showed that the mass of quasi-particles packed bed decreased rapidly with combustion, then rose slowly, and finally became stable. The addition of biomass char resulted in a decrease in sintering quality due to the reduction of calcium ferrite.
ASIA-PACIFIC JOURNAL OF CHEMICAL ENGINEERING
(2023)
Article
Energy & Fuels
Fangzheng Cheng, Yang Zou, Yifan Zhu, Xinyi Wang, Bida Xie, Yan Rong, Xinfeng Yu, Hao Zhou
Summary: This paper examines the feasibility of using a liquid working medium in a solid heat storage body. A pilot-scale thermal energy storage unit with a channel-embedded solid body was studied. The results show that the unit has a thermal energy storage capacity of approximately 1.054 x 10(6) kJ, and its performance is better than that of a unit using air as the working medium.
ENERGY SOURCES PART A-RECOVERY UTILIZATION AND ENVIRONMENTAL EFFECTS
(2023)
Article
Green & Sustainable Science & Technology
Yuguo Ni, Yan Rong, Xinfeng Yu, Shengyao Huang, Xue Xue, Hao Zhou
Summary: The study investigated the decomposition characteristics of Ammonium bisulfate (ABS; NH4HSO4) and ash blend deposition after heating. The results showed that extending the heating time could alleviate the agglomeration of ash particles. The main minerals in the deposition were identified, and the content of ABS and ammonium sulfate (AS) was analyzed after heating.
ENVIRONMENTAL PROGRESS & SUSTAINABLE ENERGY
(2023)
Article
Chemistry, Physical
Zechen Li, Xiaojun Li, Jingwei Xue, Jinyuan Zhang, Can Zhu, Jing Li, Wei Ma, Lei Meng, Yongfang Li
Summary: A new A-DA ' D-A structured narrow bandgap small molecular acceptor (SMA) Se46, utilizing benzoselenadiazole as the A' unit and branched 2-butyloctyl as upper side chains in its DA' D central fused ring, was successfully designed and synthesized. Se46 exhibits red-shifted absorption and higher energy levels compared to other small molecular acceptors L8-BO and Y6, resulting in higher power conversion efficiency, short circuit current density, and open circuit voltage in organic solar cells. This study demonstrates that selenium substitution and branched alkyl upper side chains are effective strategies for enhancing the photovoltaic performance of narrow bandgap A-DA ' D-A type acceptors.
ACS ENERGY LETTERS
(2023)
Article
Multidisciplinary Sciences
Tengfei Li, Gangjian Hu, Liting Tao, Jizhong Jiang, Jingming Xin, Yawen Li, Wei Ma, Liang Shen, Yanjun Fang, Yuze Lin
Summary: High-sensitivity organic photodetectors (OPDs) with strong near-infrared (NIR) photoresponse have been developed by introducing quinoid-terminals with high Mulliken-electronegativity, extending the absorption range to below silicon bandgap. These OPDs exhibit high detectivity (D*) in the NIR range, surpassing the performance of commercial InGaAs photodetectors. Furthermore, a spectrometer prototype and NIR imaging have been successfully demonstrated using these OPDs.
Article
Chemistry, Physical
Weiping Wang, Baofeng Zhao, Heng Zhao, Zhiyuan Cong, Liuchang Wang, Haimei Wu, Wei Ma, Zhi Yang, Zihui Meng, Chao Gao
Summary: A series of asymmetric A-pi-D-pi'-A non-fullerene acceptors were designed and synthesized, and h-IEICO-4F and h-IEICO-4Cl showed excellent photovoltaic performances due to their special molecular structures and electron-attracting properties, with an efficiency of 11.65% achieved for the J52:h-IEICO-4F device.
ACS APPLIED ENERGY MATERIALS
(2023)
Article
Thermodynamics
Xue Xue, Xiang Liu, Yifan Zhu, Lei Yuan, Ying Zhu, Kelang Jin, Lei Zhang, Hao Zhou
Summary: The implementation of thermal storage technology in the steel industry has the potential to reduce carbon emissions and contribute to a more sustainable future for the planet. Utilizing molten salt furnaces to convert waste heat from blast furnace gas into thermal energy from molten salt is an innovative approach. This study utilizes ANSYS FLUENT and MATLAB calculation programs to model the thermal performance of molten salt furnaces and investigates the dynamic characteristics of thermal energy storage in these systems. Experimental validation shows a 2.46% deviation between simulation and actual data, and the study provides important insights into the relationship between external parameters and molten salt temperature rise.
Article
Energy & Fuels
Jiankang Wang, Hanxiao Meng, Xiang Liu, Lei Zhang, Kelang Jin, Hao Zhou
Summary: Injecting ammonia improves the yield and tumbler index of sintered ore, enhances fuel combustion efficiency, and reduces CO emissions. Injecting 1.0% ammonia can decrease the coke ratio and reduce carbon emissions.
Article
Energy & Fuels
Jingwen Liu, Yifan Zhu, Hao Zhou
Summary: The feasibility of flue gas recirculation technology applied to a swirl burner of COREX gas was investigated through Fluent numerical simulation. It was found that the implementation of central flue gas recirculation reduced the NOx concentration from 288.4 mg/m3 to 101.48 mg/m3. An interlayer structure for flue gas was proposed to be installed between the COREX gas and internal secondary air to further reduce nitrogen oxide emissions.
Article
Multidisciplinary Sciences
Zhong Zheng, Jianqiu Wang, Junzhen Ren, Shijie Wang, Yafei Wang, Wei Ma, Lei Zheng, Hao Li, Yanjie Tang, Shaoqing Zhang, Jianhui Hou
Summary: Meniscus-guided coating is widely used in the printing process of photovoltaic electronics and offers outstanding depositing accuracy, functional diversity, and operating convenience. However, there is still limited understanding about the hydrodynamic behaviors of bulk heterojunction ink and the key dynamic parameter that governs film formation. In this study, we establish a principle to accurately evaluate the Hamaker constant and reveal the critical effect of precursor film length on flow evolution, polymer aggregation, and final morphology. Our prediction method for precursor film length enables accurate tracing of the optimal coating speed. Furthermore, a power conversion efficiency of 18.39% has been achieved in a 3-cm(2) cell using blade coating, with only a slight reduction from 19.40% in a 0.04-cm(2) cell using spin coating.
Article
Energy & Fuels
Laiquan Lv, Shengyao Huang, Hao Zhou
Summary: This study systematically investigated the effect of structural characteristics and surface functional groups of chemically activated biochar on the thermal properties of phase change materials (PCMs). The biochar activated by KOH showed the highest specific surface area and loading capacity, while ZnCl2 and H3PO4-activated biochar were not suitable as support materials for PCMs. Additionally, ZnCl2-activated biochar had the most significant impact on the thermal conductivity of PCMs.
SOLAR ENERGY MATERIALS AND SOLAR CELLS
(2024)
Article
Thermodynamics
Yuhang Zuo, Hao Zhou
Summary: This study investigates the safety issues and thermal performance of evacuated molten salt tower receivers during preheating. Experimental and numerical modeling methods were used to analyze the influence of operating and environmental factors on the thermal stress and performance of the receiver. The results show that the thermal stress is determined by the circumferential temperature gradient and is significantly reduced under strong wind conditions.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Yize Zhang, Ao Zhang, Lei Zhang, Kelang Jin, Hao Zhou
Summary: A new bypass flue heating technology based on multi-pipe and multipoint was proposed in this study. The effects of different baffle openings and positions on the mixing characteristics of multiple jets were investigated through experiments and simulations. The results show that the changes of baffle can affect the mixing temperature and the thermal mixing temperature inhomogeneity.
APPLIED THERMAL ENGINEERING
(2024)