Article
Energy & Fuels
T. Leffler, M. Eriksson, B. Leckner, F. Lind, F. Winquist, P. Knutsson
Summary: The thermal conversion of biomass fuel mixes in fluidized beds can cause agglomeration. To counteract agglomeration, bed material is gradually exchanged with virgin bed material, and this results in increased disposal of used bed material. Furthermore, the bed material exchange represents a costly option, as it involves a cost for virgin bed material, for landfill, and for unplanned downtime of the plant. This paper presents a novel method for the evaluation of bed material quality: the electronic tongue (ET). Evaluation of bed material quality can contribute toward decreasing the cost of unnecessary exchanges of bed material. The proposed method was tested on bed material sampled on an almost daily basis from a commercial fluidized bed boiler during several months of operation. A two-electrode ET was used for the evaluation of the bed material quality. The analysis relied on pulsed voltammetry measurements and multivariate data analysis with Principal Component Analysis (PCA). The results suggest that it is possible to follow bed material changes and that the ET, after further development, may be used to optimize the material flows connected to the bed material. Further research is being conducted to optimize the ET's performance and its application in monitoring bed material.
Article
Energy & Fuels
Guoliang Song, Yuan Xiao, Zhao Yang, Xueting Yang, Qinggang Lyu, Xingshun Zhang, Qingbo Pan
Summary: The study focused on investigating the operating and emission characteristics during mono-combustion of coal slime in a 75 t/h circulating fluidized bed boiler. The temperature distribution in the furnace was influenced by the fuel characteristics of coal slime and feeding location.
Article
Thermodynamics
Zecheng Liu, Wenqi Zhong, Xuejiao Liu, Yingjuan Shao
Summary: Replacing the steam cycle with the supercritical CO2 (S-CO2) cycle in coal-fired power generation improves efficiency, reduces carbon emissions, and increases renewable energy utilization. However, there is limited research on the techno-economic and environmental performance of S-CO2 power generation.
Article
Thermodynamics
Zecheng Liu, Wenqi Zhong, Yingjuan Shao, Xuejiao Liu
Summary: The carbon peak and neutrality strategy has led to a rapid increase in renewable energy. Small-capacity thermal power units with supercritical CO2 (S-CO2) cycle have great potential in developing regional renewable energy power grids due to their high efficiency and superior flexibility for peak shaving. This paper presents the conceptual design of a 100 MW small-capacity S-CO2 circulating fluidized bed coal-fired boiler using an improved boiler design calculation method. The optimization results show that increasing the hot air temperature and utilizing a flue gas cooler to recover residual heat of the flue gas can significantly improve the power generation efficiency of the S-CO2 unit.
Article
Engineering, Mechanical
Suwarno Suwarno, Giri Nugroho, Andik Santoso, Witantyo
Summary: A significant number of tubes in the tubular air preheater (APH) at the cold end of the back pass region of a circulating fluidized bed (CFB) boiler were found to have leaks after five years of operation. Laboratory analysis revealed that the high phosphorus content in the steel and sulfuric acid deposition were the main causes of severe corrosion, leading to the leaks. This study demonstrates how high phosphorus content in steel accelerates corrosion by sulfuric acid in power plant equipment.
ENGINEERING FAILURE ANALYSIS
(2021)
Article
Thermodynamics
Guorui Sun, Haowen Wu, Shangzhong Liu, Tonghua Liu, Jixiang Liu, Hairui Yang, Man Zhang
Summary: This study characterizes the thermal inertia of Circulating Fluidized Bed (CFB) boilers by evaluating the change in heat accumulation corresponding to unit power generation. It proposes the use of a metal grille instead of refractory material to reduce thermal inertia. The results show that over 50% of the thermal inertia of CFB boilers comes from refractory material, and the use of a metal grille improves heat transfer and decreases furnace chamber temperature, facilitating faster load response.
JOURNAL OF THERMAL SCIENCE
(2023)
Article
Thermodynamics
Yuan Jiang, Peijie Zong, Xue Ming, Haixin Wei, Xin Zhang, Yuan Bao, Bin Tian, Yuanyu Tian, Yingyun Qiao
Summary: The study investigated the influence of temperature and particle size on the high-temperature fast pyrolysis behaviors of Shenmu(Yulin) coal. Results showed that different parameters led to varied yields of coal-char, coal-tar, and coal-gas, with the particle size affecting coal-char and coal-tar differently.
Article
Thermodynamics
Zhaozhi Li, Yingjuan Shao, Wenqi Zhong, Hao Liu
Summary: This study focuses on the optimal design of the supercritical CO2 Brayton cycle for oxy-coal power plants, which has not received much attention in research. A novel triple recompression sCO2 cycle and a new sCO2 oxy-coal CFB boiler configuration were proposed and evaluated. The results showed that the novel configuration and triple recompression cycle could increase system efficiency by about 1.4% points compared to the basic system.
Article
Energy & Fuels
Jiyu Chen, Mingming Gao, Hongfu Zhang, Haoyang Yu, Guangxi Yue
Summary: Pollutant prediction for coal-fired circulating fluidized bed units is essential for optimizing ultra-low emission. Mechanism models with the determination of parameters, coefficients, and fitting functions have limitations and require a large amount of operational and unit design data. Deep learning models have been used, but they lack a priori knowledge of the mechanism process, resulting in insufficient prediction accuracy.
Article
Energy & Fuels
Tianju Chen, Ruowei Dai, Dominic Yellezuome, Ke Zhang, Ruidong Zhao, Guangrui Liu, Jinhu Wu
Summary: The study of three coal samples with different densities from Naomaohu (NMH) coal showed that density has a significant impact on the functional groups and crystalline structure of the coal samples, with low-density coal exhibiting the highest weight loss rate during the pyrolysis stage. The results also revealed distinct peaks in the DTG curves and two emission peaks during the pyrolysis and polycondensation stages for light gases such as CO2, CO, and CH4.
Article
Computer Science, Interdisciplinary Applications
Zonglong Zhang, Chen Yang, Haochuang Wu, Kangjie Deng
Summary: This study developed a dynamic simulation model for a 660MW ultra-supercritical circulating fluidized bed (CFB) boiler, which is the largest in scale and capacity in China. The model includes the water-steam system, air-flue gas system, material supply system, and ash circulation system. The gas-solid flow in the furnace was modeled based on the core-annulus flow structure, and a six-equation solution was used for the water-steam flow. The steady-state and transient simulation models showed high accuracy when compared to design conditions.
COMPUTERS & CHEMICAL ENGINEERING
(2023)
Article
Thermodynamics
Yuan Jiang, Peijie Zong, Bin Tian, Xue Ming, Fanfan Xu, Yuanyu Tian, Yingyun Qiao, Dawei Li, Qingshuo Song, Qiankun Yu
Summary: Studying the pyrolysis behavior of the saturate component in coal, which mainly consists of volatile substances, through the combined utilization of TG-FTIR and Py-GC/MS revealed a free radical reaction mechanism. The research provides a methodological model for exploring other group components and reveals specific details about the pyrolysis of coal.
Article
Thermodynamics
Miao Miao, Boyu Deng, Hao Kong, Hairui Yang, Junfu Lyu, Xiaoguo Jiang, Man Zhang
Summary: This paper explores the combustion characteristics of different types of coal under various oxygen concentrations in a fluidized bed reactor. It found that factors such as bed temperature, oxygen concentration, and coal type significantly affect combustion characteristics, with coals high in volatile matter exhibiting more obvious separated combustion phenomena.
Article
Engineering, Chemical
Yangjian Xiao, Yudong Xia, Aipeng Jiang, Xiaofang Lv, Yamei Lin, Hanyu Zhang
Summary: The cooperative optimization of a two-stage desulfurization processes in the slime fluidized bed boiler was studied, with a model-based optimization strategy proposed to minimize the operational cost of the desulfurization system. The developed model was used to simulate and analyze parameters affecting the SO2 concentration at the outlet of the boiler, while discussion on sulfur content, excess air coefficient, and calcium to sulfur ratio was conducted. Results showed that optimized operation reduced total desulfurization cost by 9%, improving thermal efficiency and ensuring stable emission of flue gas SO2.
Article
Energy & Fuels
Chen Yang, Zonglong Zhang, Haochuang Wu, Kangjie Deng
Summary: A full-scale dynamic simulation model of a 660 MW ultra-supercritical circulating fluidized bed (CFB) boiler was established and calibrated in this study. The model can reasonably simulate the dynamic behaviors of the boiler.
Article
Energy & Fuels
Lei Zhang, Tingting Li, Dimple Quyn, Li Dong, Penghua Qiu, Chun-Zhu Li
Article
Energy & Fuels
Lei Zhang, Shiro Kajitani, Satoshi Umemoto, Shuai Wang, Dimple Quyn, Yao Song, Tingting Li, Shu Zhang, Li Dong, Chun-Zhu Li
Article
Chemistry, Applied
Lei Zhang, Tingting Li, Dimple Quyn, Li Dong, Penghua Qiu, Chun-Zhu Li
FUEL PROCESSING TECHNOLOGY
(2015)
Article
Chemistry, Applied
Shuai Wang, Tingting Li, Liping Wu, Lei Zhang, Li Dong, Xun Hu, Chun-Zhu Li
FUEL PROCESSING TECHNOLOGY
(2015)
Article
Energy & Fuels
Shu Zhang, Yao Song, Yun Cai Song, Qun Yi, Li Dong, Ting Ting Li, Lei Zhang, Jie Feng, Wen Ying Li, Chun-Zhu Li
Article
Energy & Fuels
Lei Zhang, Tingting Li, Shuai Wang, Li Dong, Chun-Zhu Li
Article
Energy & Fuels
Lei Zhang, Tingting Li, Shuai Wang, Yao Song, Li Dong, Shu Zhang, Chun-Zhu Li
Article
Energy & Fuels
Tingting Li, Lei Zhang, Li Dong, Shuai Wang, Yao Song, Liping Wu, Chun-Zhu Li
Article
Chemistry, Applied
Tingting Li, Lei Zhang, Li Dong, Shu Zhang, Penghua Qiu, Shuai Wang, Chun-Zhu Li
FUEL PROCESSING TECHNOLOGY
(2017)
Article
Energy & Fuels
Tingting Li, Lei Zhang, Li Dong, Penghua Qiu, Shuai Wang, Shengjuan Jiang, Chun-Zhu Li
Article
Engineering, Chemical
Li Dong, Wenfeng Ji, Zhigang Zhao, Guangwen Xu
ADVANCED POWDER TECHNOLOGY
(2014)
Article
Energy & Fuels
Xi Zeng, Fang Wang, Hongling Li, Yin Wang, Li Dong, Jian Yu, Guangwen Xu
Article
Energy & Fuels
Lianguo Cai, Xiao Shang, Shiqiu Gao, Yin Wang, Li Dong, Guangwen Xu
Article
Energy & Fuels
Shu Zhang, Mohammad Asadullah, Li Dong, Hui-Ling Tay, Chun-Zhu Li
Article
Energy & Fuels
Tingting Li, Lei Zhang, Li Dong, Chun-Zhu Li
Article
Chemistry, Analytical
Guanshuai Zhang, Shanjian Liu, Dongmei Bi, Zhisen He, Jia Liu, Yinjiao Liu
Summary: Hydrogen peroxide pretreatment was applied for fast pyrolysis of corn stalks, and it was found that the pretreatment effectively promoted lignin depolymerization and decreased the reaction activation energy. The pretreatment also increased the cellulose content and removed alkali and alkaline earth metals from the biomass. The pH of the hydrogen peroxide solution affected the removal of lignin and ash by the pretreatment, and the composition of bio-oil changed significantly, with a significant increase in the relative content of levoglucosan after pretreatment.
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
(2024)