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Properties change of activated coke for sintering flue gas purification in cyclic removal of SO_(2) and NO_(x)

Journal of Iron and Steel Research International 2021年第6期28卷 641-650页

作者： Sheng-li Wu wei-li zhang Zhong-jie Hu School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China Ironmaking Plant Baoshan Iron and Steel Co.Ltd.Shanghai 201999China

The properties of activated coke(AC)for sintering flue gas purification greatly affect the efficiency of desulfurization and denitration,but they gradually change during *** change in properties of coal-based AC during cycles was studied to clarify the change law and AC optimization *** AC oxygen content rapidly increases 13.49 to 17.87 wt.%in the early cycles to form phenol,which promotes the denitration rate 55.63%to 78.20%.The denitration performance slowly increases in subsequent cycles becaof the generation of quinone AC slow ***,the oxygen-containing groups are not conducive to adsorption capacity of AC for *** adsorbed NO species which can be replaced SO2 is the main NO species on AC,and its amount decreases with the decrease in CC content of *** AC chemical loss leads to the opening of closed pores,expansion of original pores and formation of new pores,causing micropore volume to increase 0.085%to 0.152%,compressive strength to decrease 472 to 336 N,and abrasive resistance to decrease 97.87%to 94.16%during *** low oxygen content and high micropore volume are favorable to the initial desulfurization performance,and the former is more *** a while,the desulfurization rate is linearly positively correlated with the micropore volume regardless of the chemistry.4-h desulfurization rate increased 69.03%to 85.91%during 25 cycles due to the increasing micropore *** AC properties change in cycles will greatly affect the desulfurization and denitration rate in the height direction of the flue gas purification *** the coal-based AC with moderate micropore volume,easy oxidation surface and less original oxygen-containing groups facilitates the better purification efficiency at lower cost for sintering plants.

关键词： Activated coke Sintering flue gas Purification Desulfurization Denitration Cycle

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Analysis of operational parameters affecting denitrification rate of sintering flue gas in cross-flow activated coke purification facility

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Journal of Iron and Steel Research International 2020年第8期27卷 887-897页

作者： wei-li zhang Sheng-li Wu Zhong-jie Hu School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China Baoshan Iron and Steel Co. Ltd.Shanghai 201999China

The denitrification rate of the cross-flow activated coke flue gas purification facility varies with operational parameters. According to the simulated experiments, the denitrification rate with the height drop of the denitrification unit experiences 100%, rapid decreasing, and gradual rising to the equilibrium. According to the correlation analysis results based on production data, several operational parameters affecting the denitrification rate have been obtained. The denitrification rate has negative relationships with the activated coke bed temperature, the flue gas flow, the H2O content, the SO2 content and the NH3 slip, and has positive relationships with the O2 content, the NOx content, the NH3–NOx molar ratio, the flue gas pressure and the regeneration temperature. Properly increasing the sintering air leakage or the cooling air added into flue gas is beneficial to increase the denitrification rate. Priority should be given to O2, NH3–NOx molar ratio and flue gas flow to improve the denitrification rate. Additionally, a linear model, which had been validated, was developed and can be used to predict and control the denitrification rate.

关键词： Denitrification Activated coke Operational parameter Sintering flue gas Statistical analysis

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The Rate of Convergence of Augmented Lagrangian Method for Minimax Optimization Problems with Equality Constraints

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Journal of the Operations Research Society of China 2024年第2期12卷 265-297页

作者： Yu-Hong Dai li-wei zhang LSEC ICMSECAMSSChinese Academy of SciencesBeijing 100190China Institute of Operations Research and Control Theory School of Mathematical SciencesDalian University of TechnologyDalian 116024China

The augmented Lagrangian function and the corresponding augmented Lagrangian method are constructed for solving a class of minimax optimization problems with equality *** prove that,under the linear independence constraint qualification and the second-order sufficiency optimality condition for the lower level problem and the second-order sufficiency optimality condition for the minimax problem,for a given multiplier vectorμ,the rate of convergence of the augmented Lagrangian method is linear with respect to||μu-μ^(*)||and the ratio constant is proportional to 1/c when the ratio|μ-μ^(*)||/c is small enough,where c is the penalty parameter that exceeds a threshold c_(*)>O andμ^(*)is the multiplier corresponding to a local ***,we prove that the sequence of multiplier vectors generated by the augmented Lagrangian method has at least Q-linear convergence if the sequence of penalty parameters(ck)is bounded and the convergence rate is superlinear if(ck)is increasing to ***,we use a direct way to establish the rate of convergence of the augmented Lagrangian method for the minimax problem with a quadratic objective function and linear equality constraints.

关键词： Minimax optimization Augmented Lagrangian method Rate of convergence Second-order sufficiency optimality

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2D Co metal-organic framework nanosheet as an oxidase-like nanozyme for sensitive biomolecule monitoring

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Rare Metals 2023年第3期42卷 797-805页

作者： Jia-wei Guo Zhong-wei Yang Xiu-li liu li-wei zhang wei-Bo Guo Jian zhang Long-Hua Ding Institute for Advanced Interdisciplinary Research School of Chemistry and Chemical EngineeringUniversity of JinanJinan 250022China School of Chemistry and Chemical Engineering Linyi UniversityLinyi276005China Department of Biology and Biological Engineering Chalmers University of Technology41296 GoteborgSweden

Nanozyme-based biomolecules sensitive and quantitative detection is an attractive strategy due to their high chemical,thermal stability and reactive ***,we have synthesized a significant number of two-dimensional(2D)cobalt-metal-organic framework(Co-MOF)nanosheets with oxidase(OXD)-like activity using a facile solvothermal method in one pot for biomolecule monitoring.

关键词： attractive cobalt facile

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Estimation of interfacial damage in composites with reinforced particles based on ultrasonic data

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Journal of University of Science and Technology Beijing 2007年第3期14卷 280-285页

作者： Xiqiang liu Peijun wei li zhang Hang Wang Applied Science School University of Science and Technology Beijing Beijing 100083 China

The scattering of elastic waves by a spherical particle with imperfect interface and the nondestructive detection of interfacial damage were studied. First, the scattering of elastic waves by a spherical particle with imperfect interface, i.e. spring interface model, was studied. Then, multiple scattering by random distributed particles was investigated and the equations to evaluate the velocity and attenuation of effective waves defined by statistic averaging were given. Furthermore, on the basis of the established relation between the velocity and interfacial constants, a method to evaluate the interfacial damage nondestructively from the ultrasonic data was pro- posed. Numerical simulation was performed for the SiC-Al composites. The velocities of the effective waves were computed to show the influence of the interface constants. Using the genetic algorithm, the interfacial damage was evaluated from the synthetic experi- mental data with various noise levels. The numerical results showed the feasibility of the method proposed.

关键词： spring model average waves scattering genetic algorithm inverse problem

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Reaction intermediates and products characterisation of NH_(3) in desulphurisation with activated coke

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Journal of Iron and Steel Research International 2024年第11期31卷 2664-2674页

作者： wei-li zhang Meng Wang Wen-zhe Si Jun-hua li School of Environment Tsinghua UniversityBeijing100084China State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical TechnologyBeijing100029China

The sulphate is an important factor restricting the efficient and stable operation of the activated coke (AC) flue gas purification system. The simulation experiments and in situ infrared tests of AC taken from desorption tower of the AC flue gas purification system were carried out to first calibrate the thermal desorption characteristics of adsorbed NH_(3) and sulphate and explore the reaction behaviour of NH_(3) with SO_(2) and H_(2)SO_(4). On this basis, some advice for optimising the sulphate generation was put forward to improve the purification efficiency of the AC system. The results show that the temperatures of the desorption of adsorbed NH_(3), the decomposition of (NH_(4))_(2)SO_(4) and NH_(4)HSO_(4) are 224, 276 and 319 ℃, respectively, which lays the foundation for the quantitative analysis of sulphate on AC. Regardless of the NH_(3) amount, only a small portion of H_(2)SO_(4) is converted to sulphate, as the H_(2)SO_(4) deposited in AC pores or agglomerated together could not come into contact with NH_(3). The final reaction product of NH_(3) and SO_(2) is mainly (NH_(4))_(2)SO_(4) which is continuously generated because the newly generated H_(2)SO_(4) is continually exposed to NH_(3), if NH_(3) is enough. The reaction of NH_(3) with H_(2)SO_(4) takes precedence over with NH_(4)HSO_(4). In the initial stages in which H_(2)SO_(4) is exposed to NH_(3), the product is essentially all NH_(4)HSO_(4) as intermediate. Then, it is further converted to (NH_(4))_(2)SO_(4) whose amount reaches equilibrium when the accessible H_(2)SO_(4) is exhausted. All the NH_(3) adsorbed on AC entering the desulphurisation tower generates NH_(4)HSO_(4), but the amount is limited. The remaining SO_(2) entering the denitrification tower mainly generates (NH_(4))_(2)SO_(4);thus, limiting the remaining SO_(2) amount is necessary to guarantee denitrification efficiency. When the NH_(3) injection is changed to the desulphurisation tower, the initial NH_(3) injection rate can be inc

关键词： Sulphate generation Activated coke Sintering flue gas treatment NH_(4)HSO_(4) (NH_(4))_(2)SO_(4)

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Statistical model of magnetization reversal in Nd-Fe-B sintered magnets

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Rare Metals 2006年第Z1期25卷 521-525页

作者： WANG Huijie ZHU Minggang li wei zhang Xin Division of Functional Materials Central Iron & Steel Research Institute Beijing 100081 China Division of Functional Materials Central Iron & Steel Research Institute Beijing 100081 China Division of Functional Materials Central Iron & Steel Research Institute Beijing 100081 China China Petroleum Materials Tianjin Corporation Tianjin 300204 China

Statistical model of magnetization reversal was used to simulate the magnetization reversal behavior in the sintered Nd-Fe-B magnets with double grain-size distributions due to the abnormal grain growth (AGG). The magnetic properties and mechanical properties due to the formation of AGG grains in Nd-Fe-B sintered magnets were tested. The results show that the magnetic properties, especially the rectangularity were severely deteriorated after the formation of the AGG grains and a step was shown on the demagnetization curve, and the occurrence of AGG may account for the poor rectangularity and existence of the step on demagnetization curve according to the statistical model of magnetization reversal. The fracture toughness and bending strength are lowered because of the stress concentration in the AGG grains. The SEM images show that the formation of AGG grains is caused by the solid sintering due to the absence of RE-rich phase. Statistical model of magnetization reversal can qualitative by explain the dependence of the magnetization reversal behavior on the grain size in the Nd-Fe-B sintered magnets.

关键词： sintered Nd-Fe-B magnets mechanical properties magnetization reversal abnormal grain growth

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A Note on B-Subdifferential of Projection Operator on Polyhedral Set

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Journal of the Operations Research Society of China 2024年第3期12卷 837-845页

作者： Hao-Yang liu Jia Wu li-wei zhang Institute of Operations Research and Control Theory School of Mathematical SciencesDalian University of TechnologyDalian116024LiaoningChina

This note characterizes the set of Fréchet-differentiable points of the projection operator on a polyhedral set and the B-subdifferential of this projection operator at any point.

关键词： Polyhedral set Projection operator B-subdifferential Strong regularity

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A time-dependent numerical model of the mild-slope equation

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Acta Oceanologica Sinica 2007年第2期26卷 106-114页

作者： SONG Zhiyao zhang Honggui KONG Jun li Ruijie zhang wei State Key Laboratory of Hydrology - Water Resources and Hydraulic Engineering Ocean College Hohai University Nanjing 210098 China

On the basis of the previous studies, the simplest hyperbolic mild-slope equation has been gained and the linear time - dependent numerical model for the water wave propagation has been established combined with different boundary conditions. Through computing the effective surface displacement and transforming into the real transient wave motion, related wave factors will be calculated. Compared with lin＇s model, analysis shows that calculation stability of the present model is enhanced efficiently, because the truncation errors of this model are only contributed by the dissipation terms, but those of lin＇s model are induced by the convection terms, dissipation terms and source terms. The tests show that the present model succeeds the merit in lin＇ s model and the computational program is simpler, the computational time is shorter, and the computational stability is enhanced efficiently. The present model has the capability of simulating transient wave motion by correctly predicting at the speed of wave propagation, which is important for the real - time forecast of the arrival time of surface waves generated in the deep sea. The model is validated against analytical solution for wave diffraction and experimental data for combined wave refraction and diffraction over a submerged elliptic shoal on a slope. Good agreements are obtained. The model can be applied to the theory research an d engineering applications about the wave propagation in a biggish area.

关键词： effective wave number effective surface displacement function numerical error stability analysis

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Second-Order Optimality Conditions for Multiobjective Optimization Whose Order Induced by Second-Order Cone

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Journal of the Operations Research Society of China 2018年第2期6卷 267-288页

作者： li-wei zhang Ji-Hong zhang Yu-Le zhang School of Mathematical Sciences Dalian University of TechnologyDalian 116024LiaoningChina

This paper is devoted to developing first-order necessary,second-order necessary,and second-order sufficient optimality conditions for a multiobjective optimization problem whose order is induced by a finite product of second-order cones(here named as Q-multiobjective optimization problem).For an abstract-constrained Q-multiobjective optimization problem,we derive two basic necessary optimality theorems for weak efficient solutions and a second-order sufficient optimality theorem for efficient *** Q-multiobjective optimization problem with explicit constraints,we demonstrate first-order and second-order necessary optimality conditions under Robinson constraint qualification as well as second-order sufficient optimality conditions under upper second-order regularity for the explicit *** applications,we obtain optimality conditions for polyhedral conic,second-order conic,and semi-definite conic Q-multiobjective optimization problems.

关键词： Second-order cone-induced multiobjective optimization Optimality conditions Polyhedral cone Second-order cone Semi-definite cone

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