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Review on research and development of oxy-coal burner for carbon capture

Science China(Technological Sciences) 2024年第3期67卷 647-672页

作者： GUO JunJun LIU JingZhang ZHANG Tai HU Fan LI PengFei LIU ZhaoHui zheng chuguang State Key Laboratory of Coal Combustion School of Energy and Power EngineeringHuazhong University of Science and Technology Wuhan 430074China CCRC King Abdullah University of Science and Technology(KAUST)Thuwal 23955-6900Kingdom of Saudi Arabia Institute of Engineering Thermophysics Chinese Academy of SciencesBeijing 100049China University of Chinese Academy of Sciences Beijing 100049China National Key Laboratory of High Efficiency and Low Carbon Utilization of Coal Beijing 100049China Institute of Energy Research Jiangxi Academy of SciencesNanchang 330096China Carbon Neutrality Research Center of Jiangxi Province Nanchang 330096China Faculty of Engineering China University of Geosciences(Wuhan)Wuhan 430074China National Energy Research and Development Center of Clean and Low Carbon Coal-based Power Generation Technologies Wuhan 430074China

In the past two decades, the oxy-fuel combustion of pulverized coal has been extensively developed, leading to the completion of several large industrial pilot oxy-fuel plants worldwide. Various types of oxy-fuel burners have been designed and tested in largescale pilot plants as key components of oxy-fuel combustion. These burners face major challenges in terms of their flame stability because of their decreasing stream momentum ratio and increasing carbon dioxide concentration. However, it offers flexibility in adjusting the oxygen concentration in each burner stream. This study aims to provide a comprehensive review of the state-of-the-art knowledge on oxy-coal burner design and operation in power plants. First, the combustion characteristics under oxy-fuel conditions are briefly introduced. Subsequently, the principal requirements and fundamental parameters of the oxy-coal burners are discussed. The development process of oxy-fuel burners is also presented. Moreover, a compatible design strategy and scaling-up techniques are described for oxy-coal burners developed by the authors over the past ten years. The performances of oxy-coal burners in three large pilot oxy-fuel plants worldwide are summarized and compared. Finally, concluding remarks are provided and potential research needs are suggested.

关键词： carbon capture oxy-fuel combustion oxy-fuel burner pulverized coal compatible design

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Sulfur evolution in chemical looping combustion of coal with MnFe_2O_4 oxygen carrier

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Journal of Environmental Sciences 2014年第5期26卷 1062-1070页

作者： Baowen Wang Chuchang Gao Weishu Wang Haibo Zhao chuguang zheng College of Electric Power North China University of Water Conservancy and Hydroelectric Power State Key Laboratory of Coal Combustion Huazhong University of Science and Technology

Chemical looping combustion （CLC） of coal has gained increasing attention as a novel combustion technology for its advantages in CO2 capture. Sulfur evolution from coal causes great harm from either the CLC operational or environmental perspective. In this research, a combined MnFe2O4 oxygen carrier （OC） was synthesized and its reaction with a typical Chinese high sulfur coal, Liuzhi （LZ） bituminous coal, was performed in a thermogravimetric analyzer （TGA）-Fourier transform infrared （FT-IR） spectrometer. Evolution of sulfur species during reaction of LZ coal with MnFeaO40C was systematically investigated through experimental means combined with thermodynamic simulation. TGA-FTIR analysis of the LZ reaction with MnFe2O4 indicated MnFe2O4 exhibited the desired superior reactivity compared to the single reference oxides Mn304 or Fe203, and SO2 produced was mainly related to oxidization of H2S by MnFe2O4. Experimental analysis of the LZ coal reaction with MnFe2O4, including X-ray diffraction and X-ray photoelectron spectroscopy analysis, verified that the main reduced counterparts of MnFe2O4 were Fe304 and MnO, in good agreement with the related thermodynamic simulation. The obtained MnO was beneficial to stabilize the reduced MnFe2O4 and avoid serious sintering, although the oxygen in MnO was not fully utilized. Meanwhile, most sulfur present in LZ coal was converted to solid MnS during LZ reaction with MnFe2O4, which was further oxidized to MnSO4. Finally, the formation of both MnS and such manganese silicates as Mn2SiO4 and MnSiO3 should be addressed to ensure the full regeneration of the reduced MnFe2O4.

关键词： CO2 capture chemical looping combustion MnFe2O4

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Lattice Boltzmann Method for Thermocapillary Flows

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Advances in Applied Mathematics and Mechanics 2010年第5期2卷 677-684页

作者： Lin zheng Zhaoli Guo Baochang Shi chuguang zheng National Laboratory of Coal Combustion Huazhong University of Science and TechnologyWuhan 430074China

In this paper,we apply a recently proposed thermal axisymmetric lattice Boltzmann model to the thermocapillary driven flow in a cylindrical container.The temperature profiles and isothermal lines at the free surface with Prandtl(Pr)number fixed at 0.01 and Marangoni(Ma)number varying from 10 to 500 are measured and compared with the previous numerical results.In addition,we also give the numerical results for different Ma numbers at Pr=1.0.It is shown that present results greed well with those reported in previous studies.

关键词： Lattice Boltzmann method axisymmetric flows thermocapillary flows

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Integrated removal of NO and mercury from coal combustion flue gas using manganese oxides supported on TiO_2

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Journal of Environmental Sciences 2017年第3期29卷 141-150页

作者： Shibo Zhang Yongchun Zhao Zonghua Wang Junying Zhang Lulu Wang chuguang zheng State Key Laboratory of Coal Combustion School of Energy and Power EngineeringHuazhong University of Science and Technology Henan Institute of Metallurgy Co. Ltd. Research Center of Quality Inspection Analysis and Test of Henan Academy of Sciences

A catalyst composed of manganese oxides supported on titania （MnOx/TiO2） synthesized by a sol-gel method was selected to remove nitric oxide and mercury jointly at a relatively low temperature in simulated flue gas from coal-fired power plants. The physico-chemical characteristics of catalysts were investigated by X-ray fluorescence （XRF）, X-ray diffraction （XRD）, and X-ray photoelectron spectroscopy （XPS） analyses, etc. The effects of Mn loading, reaction temperature and individual flue gas components on denitration and Hg0 removal were examined. The results indicated that the optimal MrgTi molar ratio was 0.8 and the best working temperature was 240℃for NO conversion. 02 and a proper ratio of [NH3]/[NO] are essential for the denitration reaction. Both NO conversion and Hg0 removal efficiency could reach more than 80% when NO and Hg0 were removed simultaneously using Mn0.8Ti at 240℃. Hg0 removal efficiency slightly declined as the Mn content increased in the catalysts. The reaction temperature had no significant effect on Hg0 removal efficiency. 02 and HCI had a promotional effect on Hg0 removal. SO2 and NH3 were observed to weaken Hg0 removal because of competitive adsorption. NO first facilitated Hg0 removal and then had an inhibiting effect as NO concentration increased without 02, and it exhibited weak inhibition of Hg0 removal efficiency in the presence of 02. The oxidation of Hg0 on MnOx/ TiO= follows the Mars-Maessen and Langmuir-Hinshelwood mechanisms.

关键词： ManganeseTitaniaNitric oxideMercurySCR

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The influence of sub-grid scale motions on particle collision in homogeneous isotropic turbulence

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Acta Mechanica Sinica 2018年第1期34卷 22-36页

作者： Yan Xiong Jing Li Zhaohui Liu chuguang zheng State Key Laboratory of Coal Combustion School of Energy and Power Engineering Huazhong University of Science and Technology

The absence of sub-grid scale(SGS) motions leads to severe errors in particle pair dynamics, which represents a great challenge to the large eddy simulation of particle-laden turbulent flow. In order to address this issue,data from direct numerical simulation(DNS) of homogenous isotropic turbulence coupled with Lagrangian particle tracking are used as a benchmark to evaluate the corresponding results of filtered DNS(FDNS). It is found that the filtering process in FDNS will lead to a non-monotonic variation of the particle collision statistics, including radial distribution function, radial relative velocity, and the collision kernel. The peak of radial distribution function shifts to the large-inertia region due to the lack of SGS motions, and the analysis of the local flowstructure characteristic variable at particle position indicates that the most effective interaction scale between particles and fluid eddies is increased in FDNS. Moreover,this scale shifting has an obvious effect on the odd-order moments of the probability density function of radial relative velocity, i.e. the skewness, which exhibits a strong correlation to the variance of radial distribution function in FDNS.As a whole, the radial distribution function, together with radial relative velocity, can compensate the SGS effects for the collision kernel in FDNS when the Stokes number based on the Kolmogorov time scale is greater than 3.0. However,it still leaves considerable errors for St< 3.0.

关键词： Particle-laden turbulence Homogenous isotropic turbulence Large eddy simulation Particle collisions

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Evaluation of Three Lattice Boltzmann Models for Particulate Flows

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Communications in Computational Physics 2013年第4期13卷 1151-1172页

作者： Liang Wang Zhaoli Guo Baochang Shi chuguang zheng State Key Laboratory of Coal Combustion Huazhong University of Science and TechnologyWuhan430074P.R.China School of Mathematics and Statistics Huazhong University of Science and TechnologyWuhan430074P.R.China

A comparative study is conducted to evaluate three types of lattice Boltzmann equation(LBE)models for fluid flows with finite-sized particles,including the lattice Bhatnagar-Gross-Krook(BGK)model,the model proposed by Ladd[Ladd AJC,J.Fluid Mech.,271,285-310(1994);Ladd AJC,J.Fluid Mech.,271,311-339(1994)],and the multiple-relaxation-time(MRT)model.The sedimentation of a circular particle in a two-dimensional infinite channel under gravity is used as the first test problem.The numerical results of the three LBE schemes are compared with the theoretical results and existing data.It is found that all of the three LBE schemes yield reasonable results in general,although the BGK scheme and Ladd’s scheme give some deviations in some cases.Our results also show that the MRT scheme can achieve a better numerical stability than the other two schemes.Regarding the computational efficiency,it is found that the BGK scheme is the most superior one,while the other two schemes are nearly identical.We also observe that the MRT scheme can unequivocally reduce the viscosity dependence of the wall correction factor in the simulations,which reveals the superior robustness of the MRT scheme.The superiority of the MRT scheme over the other two schemes is also confirmed by the simulation of the sedimentation of an elliptical particle.

关键词： Lattice Boltzmann equation finite-sized particles numerical performance sedimentation in channel

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Differentially weighted direct simulation Monte Carlo method for particle collision in gas-solid flows

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Particuology 2015年第4期13卷 135-145页

作者： Yongxiang He Haibo Zhao Haoming Wang chuguang zheng State Key Laboratory of Coal Combustion Huazhong University of Science and Technology

In gas-solid flows, particle-particle interaction （typical, particle collision） is highly significant, despite the small particles fractional volume. Widely distributed polydisperse particle population is a typical characteristic during dynamic evolution of particles （e.g., agglomeration and fragmentation） in spite of their initial monodisperse particle distribution. The conventional direct simulation Monte Carlo （DSMC） method for particle collision tracks equally weighted simulation particles, which results in high statistical noise for particle fields if there are insufficient simulation particles in less-populated regions. In this study, a new differentially weighted DSMC （DW-DSMC） method for collisions of particles with different number weight is proposed within the framework of the general Eulerian-Lagrangian models for hydrodynamics. Three schemes （mass, momentum and energy conservation） were developed to restore the numbers of simulation particle while keeping total mass, momentum or energy of the whole system unchanged respectively. A limiting case of high-inertia particle flow was numerically simulated to validate the DW-DSMC method in terms of computational precision and efficiency. The momentum conservation scheme which leads to little fluctuation around the mass and energy of the whole system performed best. Improved resolution in particle fields and dynamic behavior could be attained simultaneously using DW-DSMC, compared with the equally weighted DSMC. Meanwhile, computational cost can be largely reduced in contrast with direct numerical simulation.

关键词： Direct simulation Monte Carlo Differentially weighted method Gas-solid flow Particle-particle collision Four-way coupling

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Fundamental and Technical Challenges for a Compatible Design Scheme of Oxyfuel Combustion Technology

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Engineering 2015年第1期1卷 139-149页

作者： chuguang zheng Zhaohui Liu Jun Xiang Liqi Zhang Shihong Zhang Cong Luo Yongchun Zhao State Key Laboratory of Coal Combustion Huazhong University of Science and Technology

Oxyfuel combustion with carbon capture and sequestration(CCS) is a carbon-reduction technology for use in large-scale coal-fired power plants. Significant progress has been achieved in the research and development of this technology during its scaling up from 0.4 MWth to 3 MWth and 35 MWth by the combined efforts of universities and industries in China. A prefeasibility study on a 200 MWe large-scale demonstration has progressed well, and is ready for implementation. The overall research development and demonstration(RD&D) roadmap for oxyfuel combustion in China has become a critical component of the global RD&D roadmap for oxyfuel combustion. An air combustion/oxyfuel combustion compatible design philosophy was developed during the RD&D process. In this paper, we briefly address fundamental research and technology innovation efforts regarding several technical challenges, including combustion stability, heat transfer, system operation, mineral impurities, and corrosion. To further reduce the cost of carbon capture, in addition to the large-scale deployment of oxyfuel technology, increasing interest is anticipated in the novel and nextgeneration oxyfuel combustion technologies that are briefly introduced here, including a new oxygen-production concept and flameless oxyfuel combustion.

关键词：富氧燃烧技术设计哲学兼容燃煤发电厂燃烧稳定性减排技术预可行性组成部分

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Two-component Brownian coagulation: Monte Carlo simulation and process characterization

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Particuology 2011年第4期9卷 414-423页

作者： Haibo Zhao chuguang zheng State Key Laboratory of Coal Combustion Huazhong University of Science and Technology Wuhan 430074 Hubei China

The compositional distribution within aggregates of a given size is essential to the functionality of com- posite aggregates that are usually enlarged by rapid Brownian coagulation, There is no analytical solution for the process of such two-component systems, Monte Carlo method is an effective numerical approach for two-component coagulation, In this paper, the differentially weighted Monte Carlo method is used to investigate two-component Brownian coagulation, respectively, in the continuum regime, the free-molecular regime and the transition regime. It is found that （1） for Brownian coagulation in the continuum regime and in the free-molecular regime, the mono-variate compositional distribution, i.e., the number density distribution function of one component amount （in the form of volume of the component in aggregates） satisfies self-preserving form the same as particle size distribution in mono-component Brownian coagulation; （2） however, for Brownian coagulation in the transition regime the mono-variate compositional distribution cannot reach self-similarity; and （3） the bivariate compositional distribution, i.e., the combined number density distribution function of two component amounts in the three regimes satisfies a semi self-preserving form. Moreover, other new features inherent to aggregative mixing are also demonstrated; e.g., the degree of mixing between components, which is largely controlled by the initial compositional mass fraction, improves as aggregate size increases.

关键词： Multivariate population balance Aggregation Stochastic method Mixing Self-preserving

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Monte Carlo simulation for simultaneous particle coagulation and deposition

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Science China(Technological Sciences) 2006年第2期49卷 222-237页

作者： ZHAO Haibo zheng chuguang State Key Laboratory of Coal Combustion Huazhong University of Science & Technology Wuhan 430074 China State Key Laboratory of Coal Combustion Huazhong University of Science & Technology Wuhan 430074 China

The process of dynamic evolution in dispersed systems due to simultaneous particle coagulation and deposition is described mathematically by general dynamic equation (GDE). Monte Carlo (MC) method is an important approach of numerical solu- tions of GDE. However, constant-volume MC method exhibits the contradictory of low computation cost and high computation precision owing to the fluctuation of the number of simulation particles; constant-number MC method can hardly be applied to engineering application and general scientific quantitative analysis due to the continual contraction or expansion of computation domain. In addition, the two MC methods depend closely on the “subsystem” hypothesis, which constraints their expansibility and the scope of application. A new multi-Monte Carlo (MMC) method is promoted to take account of GDE for simulta- neous particle coagulation and deposition. MMC method introduces the concept of “weighted fictitious particle” and is based on the “time-driven” technique. Furthermore MMC method maintains synchronously the computational domain and the total number of fictitious particles, which results in the latent expansibility of simulation for boundary con- dition, the space evolution of particle size distribution and even particle dynamics. The simulation results of MMC method for two special cases in which analytical solutions exist agree with analytical solutions well, which proves that MMC method has high and stable computational precision and low computation cost because of the constant and limited number of fictitious particles. Lastly the source of numerical error and the relative error of MMC method are analyzed, respectively.

关键词： multi-Monte Carlo method, general dynamic equation, coagulation, deposition, particle size distribution, dispersed systems.

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