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Numerical simulation of the effect of coaxial and cross-axis injection modes on pulverized coal combustion in the raceway of blast furnace tuyere

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PARTICUOLOGY 2024年第10期93卷 154-169页

作者： Wang, Yunpeng Gao, Lei Zhou, Xiaolei Kunming Univ Sci & Technol Fac Met & Energy Engn Kunming 650093 Peoples R China

The aim of this study isto investigate the influence of the angle of the pulverized coal (PC) injection lance on the combustion characteristics of fuel in the raceway of blast furnace tuyeres. Using FLUENT software, a Euler-Lagrange three-dimensional numerical model was constructed to analyze the influence of different positions of blast furnace tuyere coal powder injection lance (coaxial and cross-axis) on key parameters such as temperature distribution, gas flow, and combustion efficiency. The results demonstrate that adjusting the angle of the injection lance significantly modifies the average and peak temperatures in the raceway, while the composition of gas components remains relatively stable. When the injection lance angle is 10 degrees, the average temperature and peak temperature in the raceway are 2294 K and 2747 K, respectively. When the injection lance angle is 12 degrees, the combustion efficiency of the PC reaches 80.8%. This study reveals the significant impact of the injection lance angle on the combustion process. Especially at an angle of 12 degrees, the combustion efficiency of the blast furnace significantly improves. With coaxial injection, the combustion rate increases as the distance between the injection lance tip and the tuyere increases. This paper is instructive for the optimization of the blast furnace combustion system, which improve fuel utilization efficiency and reduce environmental emissions. This paper provides practical recommendations for adjusting blast furnace operational parameters, offering insights for achieving more efficient and environmentally friendly industrial production. (c) 2024 Chinese Society of Particuology and Institute of Process Engineering, Chinese Academy of Sciences. Published by Elsevier B.V. All rights are reserved, including those for text and data mining, AI training, and similar technologies.

关键词： pulverized coal combustion Tuyere raceway Blast furnace CFD simulation GAS FLOWS CFD

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Investigation on pulverized coal combustion Behavior by Non-Isothermic Integral Thermogravimetry Method

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Journal of Iron and Steel Research International 2011年第8期18卷 1-8页

作者： QI Cheng-lin ZHANG Jian-liang LIN Xiang-hai LIU Qin-yuan WANG Xiao-liu School of Metallurgical and Ecological Engineering University of Science and Technology Beijing Beijing 100083 China

The combustion process of pulverized coal was investigated by non-isothermic integral thermogravimetry. The thermogravimetry curves were fitted by the Coats-Redferm approximation function, and kinetic parameters and characteristic temperatures were obtained. The optimal mixing ratio and particle size can be ascertained. The characteristic temperature of pulverized coal can be obtained from the thermogravimetry curve, and the combustion of coal can be divided into homogeneous and heterogeneous combustion according to the differential thermal analysis curve. The activation energy of a single type of coal ranking from low to high is as follows： bituminous coal, meager-lean coal, and anthracite. In the first mixing method, with more low-price meager-lean coal B replacing high price anthracite A, the activation energy slightly decreases; with more bituminous coal replacing meager-lean coal, total tendency makes a declining of activation. In the later mixing method, with an increase in particle size, a declining activation energy can be seen in total tendency.

关键词： pulverized coal combustion themogravimetry kinetics mixed-coal granularity coal combustion

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Radiant Image Simulation of pulverized coal combustion in Blast Furnace Raceway

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Journal of Iron and Steel Research International 2006年第2期13卷 18-21页

作者： WEN Liang-ying BAI Chen-guang OU Yang-qi CHEN Deng-fu QIU Gui-bao College of Material Science and Engineering Chongqing University Chongqing 400030 China

The relationship between two-dimensional radiant image and three-dimensional radiant energy in blast furnace raceway was studied by numerical simulation of combustion process. Taking radiant image as radiant boundary for numerical simulation of combustion process, the uneven radiation parameter can be calculated. A method to examine three-dimensional temperature distribution in blast furnace raceway was put forward by radiant image processing. The numeral temperature field matching the real combustion can be obtained by proposed numeric image processing technique.

关键词： raceway radiant image pulverized coal combustion temperature distribution

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Three Dimensional Modeling of pulverized coal combustion in a 600 MW Corner Fired Boiler

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Journal of Thermal Science 2000年第4期9卷 376-380页

作者： Sandro Dal-Secco (Department MFTT, E.D.F., 6 Quai Watier, 78400 Chatou, France) Departement MFTT E.D.F. Chatou France

The three-dimensional code ESTET developed at the LNH has been used to predict the reactive flow in a 600 MW coal fired boiler. Assuming a no-slip condition between the gas and the coal, the equations for a gas-particle mixture can be written. The pulverized coal particle size distribution is represented by a discrete number of particle size groups determined by the measured fineness distribution. The combustion models taking into account the pyrolysis of the particle and the heterogeneous combustion of char have been validated using intensive measurements performed on the 600 MW utility boiler. Heat fluxes were measured along the walls of the furnace and satisfactory agreement between computation and measurements has been achieved in terms of maximum flux location and heat flux intensity. Local measurements of velocities using LDV probe, gas temperature and gas species concentrations were performed in the vicinity of one burner and compared with the computed variables. Again we have observed a good agreement between the computations and the measurements in terms of jet penetration, temperature distribution, oxygen concentration and ash content.

关键词： mathematical model pulverized coal combustion corner-fired boiler.

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Flame radiant image numeralization for pulverized coal combustion in BF raceway

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Journal of Chongqing University 2005年第4期4卷 195-198页

作者：温良英 College of Material Science and Engineering Chongqing UniversityChongqing 400030 P. R. China

In order to establish correlativity between pulverized coal combustion in a blast furnace raceway and its radiant image, we investigated the relationships between two dimensional radiant images and three dimensional radiant energy in a blast furnace raceway, focusing on the correlativity of the numerical simulation of combustion processes with the connection of radiant images information and space temperature distribution. We calculated the uneven radiate characteristic parameterby taking radiant images as a kind of radiative boundary for numerical simulation of combustion processes, and put fonward a method to examine three-dimensional temperatures distribution in blast furnace raceway by radiant image processing. The numeral temperature fields matching the real combustion can be got by the numeric image processing technique.

关键词： raceway pulverized coal combustion radiant image temperature distribution

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Ignition Characteristics of Lean coal Used a Novel Alternating-Current Plasma Arc Approach

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Journal of Thermal Science 2022年第2期31卷 571-581页

作者： YAN Gaocheng School of Electric Power Civil Engineering and ArchitectureShanxi UniversityTaiyuan 030013China

In order to achieve the target of reducing oil consumption to zero for pulverized coal(PC)boiler in power plant,the paper developed a novel coal pulverized ignition approach,called as Alternating-Current plasma(AC plasma)ignition,with the advantages of excellent PC combustion behavior and longer electrode *** scientific principle of how to generate the AC plasma arc was elaborated in ***,the experiments on life-span of electrodes inside AC plasma generator had been conducted,finding a workable way to extend its life-span beyond 530 ***,a new AC plasma burner specifically designed for lean coal according to the principle of PC staged combustion had been illustrated with diagrams and then used to ignite the PC-air stream under four kinds of conditions with a varying AC plasma power from 150 kW to 300 kW,focusing on analyses of the influence of AC plasma power on combustion behaver,such as combustion temperature,carbon burnout rate as well as PC combustion *** following results showed that in the case of the power of the AC plasma was P=300 kW,a satisfied PC combustion process could achieved,with the average PC combustion temperature of about 940°C,combustion flame length of 6.3 m,and the total carbon burnout rate of up to 52.2%.In addition,about 80%of the nozzle outlet section was filled with bright flame,while 81%of the PC was in zone of the cylindrical flame *** PC combustion modes were changed repeatedly during the process of combustion,which went from homogeneous combustion mode at initial ignition stage to combined combustion mode and heterogeneous combustion mode at middle stage,finally to combined combustion mode at later *** research conclusion in this paper has proved that the AC plasma ignition approach is feasible and effective to ignite low-rank coal without the present of fuel oil.

关键词： pulverized coal combustion alternating-current plasma ignition oil-free ignition utility boiler start-up combustion mode

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Four Years of Operating Experience with DryFiningTM Fuel Enhancement Process at coal Creek Generating Station

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Journal of Energy and Power Engineering 2015年第6期9卷 526-538页

作者： Nenad Sarunac Charles W. Bullinger Mark Ness Department of Mechanical Engineering and Engineering Science University of North Carolina at Charlotte Charlotte NC 28223 USA Great River Energy Coal Creek Station Underwood ND 58576 USA

Lignite and sub-bituminous coals from western U.S. contain high amounts of moisture （sub-bituminous： 15%-30%, lignites： 25%-40%）. German and Australian lignites （brown coals） have even higher moisture content, 50% and 60%, respectively. The high moisture content causes a reduction in plant performance and higher emissions, compared to the bituminous （hard） coals. Despite their high-moisture content, lignite and sub-bituminous coals from the western U.S. and worldwide are attractive due to their abundance, low cost, low NOx and SOx emissions, and high reactivity. A novel low-temperature coal drying process employing a fluidized bed dryer and waste heat was developed in the U.S. by a team led by GRE （Great River Energy）. Demonstration of the technology was conducted with the U.S. Department of Energy and GRE funding at coal Creek Station Unit 1. Following the successful demonstration, the low-temperature coal drying technology was commercialized by GRE under the trade name DryFiningTM fuel enhancement process and implemented at both units at coal Creek Station. The coal drying system at coal Creek has been in a continuous commercial operation since December 2009. By implementing DryFining at coal Creek, GRE avoided $366 million in capital expenditures, which would otherwise be needed to comply with emission regulations. Four years of operating experience is described in this paper.

关键词： Power generation pulverized coal combustion high-moisture coals coal beneficiation efficiency improvement emissions reduction.

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Influence of Recirculated Flue Gas Distribution on combustion and NOx Formation Characteristics in S-CO_(2) coal-fired Boiler

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Mechanical Engineering Science 2021年第2期3卷 42-52页

作者： Peipei WANG Mingyan GU Yao FANG Boyu JIANG Mingming WANG Ping CHEN School of Energy and Environment Anhui University of TechnologyMa'anshan243002China

Supercritical carbon dioxide(S-CO_(2))Brayton power cycle power generation technology,has attracted more and more scholars'attention in recent years because of its advantages of high efficiency and *** with conventional steam boilers,S-CO_(2) has different heat transfer characteristics,it is easy to cause the temperature of the cooling wall of the boiler to rise,which leads to higher combustion gas temperature in the furnace,higher NOX generation *** adoption of flue gas recirculation has a significance impact on the combustion process of pulverized coal in the boiler,and it is the most effective ways to reduce the emission of NOX and the combustion temperature in the *** paper takes 1000MW S-CO_(2) T-type coal-fired boiler as the research target to investigate the combustion and NOX generation characteristics of S-CO_(2) coal-fired boilers under flue gas recirculation condition,the influence of recirculated flue gas distribution along the furnace height on the characteristics of NOX formation and the combustion of pulverized *** results show that the recirculated flue gas distribution has the great impact on the concentration of NOX at the boiler *** the bottom recirculation flue gas rate is gradually increased,the average temperature of the lower boiler decreases and the average temperature of the upper boiler increases slightly;The concentration of NOx at the furnace outlet increases.

关键词： S-CO_(2)boiler pulverized coal combustion NOX emission Flue gas recirculation Recirculated flue gas distribution

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