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Copper slag assisted coke reduction of phosphogypsum for sulphur dioxide preparation

Chinese Journal of Chemical Engineering 2024年第1期65卷 43-53页

作者： Dong Ma qinhui wang State Key Laboratory of Clean Energy Utilization Institute for Thermal Power EngineeringZhejiang UniversityHangzhou 310027China

The reduction of phosphogypsum(PG)to lime slag and SO_(2)using coke can effectively alleviate the environmental problems caused by ***,the PG decomposition temperature remains high and the product yield remains *** adding additives,the decomposition temperature can be further reduced and PG decomposition rate and product yield can be ***,the use of current additives such as Fe_(2)O_(3)and SiO_(2)brings the problem of increasing economic ***,it is proposed to use solid waste copper slag(CS)as a new additive to reduce PG to prepare SO2,which can reduce the cost and meet the environmental benefits at the same *** effects of proportion,temperature and thermostatic time on PG decomposition are investigated by experimental and kinetic analysis combined with FactSage thermodynamic calculations to optimize the roasting ***,the reaction mechanism is *** is found that adding CS to the coke and PG system can increase the rate of PG decomposition and SO_(2)yield while lowering the PG decomposition *** example,when the CS/PG mass ratio increases from 0 to 1,PG decomposition rate increases from 83.38%to 99.35%,SO_(2)yield increases from 78.62%to 96.81%,and PG decomposition temperature decreases from 992.4℃to 949.6℃.The optimal reaction parameters are CS/PG mass ratio of 1,Coke/PG mass ratio of 0.06 at 1100℃for 20 min with 99.35%PG decomposition rate and 96.81%SO_(2) *** process proceeds according to the following reactions:2CaSO_(4)+ 0.7C + 0.8Fe_(2)SiO_(4)→0.8Ca_(2)SiO_(4)+ 0.2Ca_(2)Fe_(2)O_(5)+ 0.4Fe_(3)O_(4)+2SO_(2)+ 0.7CO_(2)Finally,a process for decomposing PG with coke and CS is proposed.

关键词： Phosphogypsum Sulfur dioxide Copper slag Fluidized-bed Reduction Waste treatment

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Preparation of biomass-derived carbon loaded with MnO_(2) as lithium-ion battery anode for improving its reversible capacity and cycling performance

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Frontiers of Chemical Science and Engineering 2024年第1期18卷 107-120页

作者： Likai Zhu Huaping Lin Wenli Zhang qinhui wang Yefeng Zhou National&Local United Engineering Research Centre for Chemical Process Simulation and Intensification Chemical Process Simulation and Optimization Engineering Research Center of Ministry of EducationXiangtan UniversityXiangtan 411100China Guangdong Provincial Key Laboratory of Plant Resources Biorefinery School of Chemical Engineering and Light IndustryGuangdong University of TechnologyGuangzhou 510006China State Key Laboratory of Clean Energy Utilization Zhejiang UniversityHangzhou 310027China

Biomass-derived carbon materials for lithiumion batteries emerge as one of the most promising anodes from sustainable ***,improving the reversible capacity and cycling performance remains a long-standing *** combining the benefits of K2CO_(3) activation and KMnO_(4) hydrothermal treatment,this work proposes a two-step activation method to load MnO_(2) charge transfer onto biomass-derived carbon(KAC@MnO_(2)).Comprehensive analysis reveals that KAC@MnO_(2) has a micro-mesoporous coexistence structure and uniform surface distribution of MnO_(2),thus providing an improved electrochemical ***,KAC@MnO_(2) exhibits an initial chargedischarge capacity of 847.3/1813.2 mAh·g^(-1) at 0.2 A·g^(-1),which is significantly higher than that of direct pyrolysis carbon and K2CO_(3) activated carbon,***,the KAC@MnO_(2) maintains a reversible capacity of 652.6 mAh·g^(-1) after 100 *** at a high current density of 1.0 A·g^(-1),KAC@MnO_(2) still exhibits excellent long-term cycling stability and maintains a stable reversible capacity of 306.7 mAh·g^(-1) after 500 *** with reported biochar anode materials,the KAC@MnO_(2) prepared in this work shows superior reversible capacity and cycling ***,the Li+insertion and de-insertion mechanisms are verified by ex situ X-ray diffraction analysis during the chargedischarge process,helping us better understand the energy storage mechanism of KAC@MnO_(2).

关键词： biomass-derived carbon MnO_(2) lithium-ion batteries anode material high reversible capacity

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Copper slag assisted coke reduction of phosphogypsum for sulphur dioxide preparation

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中国化学工程学报（英文版） 2024年第1期 43页

作者： Dong Ma qinhui wang

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Investigation on Fuel-N Transformation Properties of Coal/Biomass Heating Process in CO_(2)Atmosphere

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Journal of Thermal Science 2021年第4期30卷 1141-1150页

作者： LIN Junjie wang qinhui LIANG Xiaorui LUO Zhongyang State Key Laboratory of Clean Energy Utilization Zhejiang UniversityHangzhou 310027China

To understand the effect of a CO_(2)atmosphere on the properties of the transformation from fuel-N to NO_(x)precursors(mainly NH_(3)and HCN),pyrolysis experiment on Pingliang coal(PL coal),wheat straw and their corresponding blends was carried out in a fluidized bed reactor within a temperature range of 750℃to 850℃.The results indicated that the PL coal and wheat straw show different NO_(x)precursor formation properties owing to the discrepancy between the N-containing structures in the raw *** with an argon atmosphere,CO_(2)can effectively suppress the formation of NH_(3).For HCN,the HCN yield of PL coal is suppressed and the HCN yield of wheat straw is ***,CO_(2)can suppress the overall nitrogen conversion rate of NH_(3)^(+)HCN for both coal and biomass,which causes more fuel-N to convert into tar-N and N_(2)-*** the blends of PL coal and wheat straw,the copyrolysis synergistic effect of coal/biomass influences the selectivity of HCN and NH_(3).The copyrolysis synergistic effect favors the formation of copyrolyzed HCN but has an opposite impact on the transformation from fuel-N to NH_(3).The synergistic effect of coal/biomass promotes the overall nitrogen conversion rate of NH_(3)^(+)HCN under a CO_(2)atmosphere,and the overall nitrogen conversion rate of NH_(3)+HCN is suppressed under an argon atmosphere,*** addition,the synergistic effect of coal/biomass suppresses the yield of environmentally harmless N_2,and more fuel-N was retained in the char.

关键词： Pyrolysis coal/biomass nitrogen NH_3 HCN

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A comprehensive CFD combustion model for supercritical CFB boilers

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Particuology 2019年第2期17卷 29-37页

作者： Linjie Xu Leming Cheng JieqiangJi qinhui wang Mengxiang Fang Institute for Thermal Power Engineering State Key Laboratory of Clean Energy Utilization Zhejiang University Hangzhou 31002China

A combustion model of a large-scale supercritical circulati ng fluidized bed (CFB) boiler was developed for comprehensive computational-fluid-dynamics analysis. The model incorporates gas-solid hydrodynamics, coal combustion, heat transfer on heat exchange surfaces in the furnace, and heat transfer between fumace and working medium in the heat transfer tubes. In simulating the dense and dilute phases in the fumace, the gas-solid hydrodynamics is based on the Euler-Euler model and energy-minimization multiscale drag model. Coal combustion entails evaporation, devolatilization, char combustion, gas homoge neous reaction, and pollutant emission. The coefficient ofheat transfer between gas-solid and the waterwall is estimated using the cluster renewal model, and for radiation, the discrete ordinate model is used. Moreover, thermohydraulic processes in the membrane wall are also in eluded in the heat transfer process. The model was successfully applied in simulations of a 350-MW supercritical CFB boiler. Detailed distributions of solids concentration, oxygen, heat flux, and working medium temperature in the boiler furnace are presented.

关键词： Comprehensive combustion model Computational fluid dynamic Thermal-hydraulics Supercritical circulating fluidized bed Large-scale furnace

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农林废弃物循环流化床空气气化特性实验研究

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发电技术 2024年第3期45卷 535-544页

作者：高忠明朱德敖陈雨佳刘三举王勤辉湖北华电襄阳发电有限公司湖北省襄阳市441000 能源清洁利用国家重点实验室(浙江大学) 浙江省杭州市310027

【目的】考察生物质种类在不同参数下对循环流化床空气气化特性的影响,为宽燃料适应性的生物质循环流化床气化技术和生物质气化耦合燃煤发电技术提供相关数据参考。【方法】在自行搭建的小型常压循环流化床气化实验装置上,开展了以空气... 详细信息

【目的】考察生物质种类在不同参数下对循环流化床空气气化特性的影响,为宽燃料适应性的生物质循环流化床气化技术和生物质气化耦合燃煤发电技术提供相关数据参考。【方法】在自行搭建的小型常压循环流化床气化实验装置上,开展了以空气当量比(equivalent ratio,ER)、气化温度为参数,农林废弃物(稻壳、木屑、玉米秸秆和稻草)为原料的空气气化实验研究。【结果】稻壳、木屑、玉米秸秆和稻草气化气组分在不同空气当量比下的变化规律基本一致,随着空气当量比不断增加,稻壳、木屑、玉米秸秆和稻草的气化燃气低位热值和冷煤气效率均呈现先增后减的变化趋势,对于稻壳、木屑和玉米秸秆,ER为0.20时均为最优工况,最高冷煤气效率分别为46.19%、38.07%和37.71%;而对于稻草,ER为0.25时为最优工况,最高冷煤气效率可达39.55%;稻壳、木屑、玉米秸秆和稻草气化气组分中的三大可燃气体(CH4、CO、H2)在不同气化温度下的变化规律也一致,随着气化温度不断升高,稻壳、木屑、玉米秸秆和稻草的气化燃气低位热值和冷煤气效率也均呈现先增后减的变化趋势,其中稻壳和玉米秸秆冷煤气效率在气化温度为750℃时达到峰值,分别为46.19%和37.71%,而木屑和稻草在气化温度为760℃时达到峰值,分别为38.07%和37.56%。【结论】研究结果可为宽燃料适应性的生物质循环流化床气化技术和生物质气化耦合燃煤发电技术提供相关数据参考。

关键词：农林废弃物生物质循环流化床空气气化空气当量比

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流化床中煤气化细渣高温还原磷石膏过程

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化工进展 2024年第6期43卷 3479-3491页

作者：马栋解桂林田治华王勤辉张建国宋慧林钟晋浙江大学能源清洁利用国家重点实验室浙江杭州310027 云南云天化环保科技有限公司云南昆明650300

磷石膏(PG)是世界上重要的工业固体废物之一,其传统的储存方法占用了大片土地,也破坏了环境。采用热化学方法将PG还原为CaS和CaO不仅可以变废为宝,而且缓解了环境污染。常见的还原剂主要是褐煤和硫黄等,然而上述还原剂存在成本较高的缺... 详细信息

磷石膏(PG)是世界上重要的工业固体废物之一,其传统的储存方法占用了大片土地,也破坏了环境。采用热化学方法将PG还原为CaS和CaO不仅可以变废为宝,而且缓解了环境污染。常见的还原剂主要是褐煤和硫黄等,然而上述还原剂存在成本较高的缺点。因此本文提出采用煤气化细渣(CGFS)来还原PG。通过热力学计算、流化床实验和动力学计算,探讨了还原行为和反应机理。首先,热力学计算表明CGFS还原PG完全可行。流化床实验发现当目标产物为CaS时,最优化的反应条件为温度应保持在850~900℃,C/Ca摩尔比为2~3,在该条件下,PG可以完全分解。当目标产物为CaO时,温度应保持在950~1000℃,C/Ca摩尔比为0.5~1,但在该条件下PG难以完全分解。此外CGFS中的矿物组分会显著影响PG的分解率,该过程主要是和CGFS的反应活性有关。接着通过比较四种常见的碳基还原剂发现,褐煤对PG的分解效率最高,细渣和焦炭相比于石墨具有较高的反应活性,也有利于PG的分解过程。此外提高C/Ca摩尔比和反应温度能够降低石墨与其他三种还原剂的差距。最后动力学研究表明,CGFS还原PG过程符合缩核反应模型,其动力学机理函数G(α)=-ln(1-α),表观活化能为415.78~456.83kJ/mol。通过SEM-EDS发现反应是从边界开始,逐渐扩散到核心,最终形成蜂窝结构。本研究将为开发环境友好型还原剂分解PG提供理论依据。

关键词：磷石膏煤气化细渣动力学热力学分解机理

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Rotation speed measurement of moving particles in a CFB riser

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Particuology 2009年第4期7卷 238-244页

作者： Xuecheng Wu qinhui wang Zhongyang Luo Mengxiang Fang Kefa Cen State Key Laboratory of Clean Energy Utilization Zhejiang University Hangzhou Zhejiang 310027 China

This paper presents a study on measuring rotation speed of moving glass beads with an average diameter of 500 p.m in a pilot-scale circulating fluidized bed （CFB） riser with a high-speed digital imaging system. Two methods have been developed to calculate particle rotation speed from the particle images. The first method consists of a fully automated algorithm based on cross-correlation of gray distribution of particle images for particles whose rotation axes are （nearly） perpendicular to the imaging plane, and the second method calculates the speed of particle rotation by identifying its rotation axis using two or more characteristic points on its surface. The reliability of the two methods is verified by using a small sphere with known speed and direction of rotation. The first method is shown to be capable of measuring accurately the rotation speed for the particle with a rotation axis （nearly） perpendicular to the imaging plane and filtering off other particles using an appropriate threshold of correlation coefficient. The second method is shown to be capable of yielding both the speed and direction of particle rotation, with a measurement error of less than 10%. Results of both methods on real glass beads in a CFB riser are compared against each other.

关键词： Rotation speed measurement Moving particles Gas-solid flow Circulating fluidized bed (CFB)

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Non-uniform distribution of gas-solid flow through six parallel cyclones in a CFB system: An experimental study

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Particuology 2012年第2期10卷 170-175页

作者： Xinglong Zhou Leming Cheng qinhui wang Zhongyang Luo Kefa Cen State Key Laboratory of Clean Energy Utlization Zhejiang UniversityHangzhou 310027China

In large-scale circulating fluidized bed （CFB） boilers, it is common to use multiple cyclones in parallel for the capture of solids, assuming that gas-solid flow to be the same in the cyclones. This article presents a study investigating gas-solid flow through six parallel cyclones in a CFB cold test rig. The six cyclones were located asymmetrically on the left and right walls of the riser. Solid volume fraction and particle velocity profiles at the riser outlets and in the horizontal ducts were measured using a fiber optical probe. Cyclone pressure drop and solid circulating rate were measured for each individual cyclone. Measure- ments showed good agreement as to the non-uniform distribution of the gas-solid flow, which occurred mainly across the three cyclones on one side： the middle cyclones on both sides had higher particle veloc- ities. Conversely, the solid volume fractions, solid fluxes and solid circulating rates of the middle cyclones were lower than those of the other four cyclones. The apparent reason for the flow non-uniformity among the cyclones is the significant flow non-uniformity at the riser outlets. Under typical operating conditions, the solid volume fractions at the riser outlets had a deviation of up to 26% whereas the solid circulating rates at the stand pipes, 7%. These results are consistent with most other studies in the literature.

关键词： Circulating fluidized bed600-MW CFBParallel cycloneSolid circulating rate

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Predictions of NOx/N2O emissions from an ultra-supercritical CFB boiler using a 2-D comprehensive CFD combustion model

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Particuology 2020年第2期18卷 77-87页

作者： Jieqiang Ji Leming Cheng Yangjun Wei Junfeng wang Xinyu Gao Mengxiang Fang qinhui wang State Key Laboratory of Clean Energy Utilization Institute for Thermal Power EngineeringZhejiang UniversityHangzhou 310027China Harbin Boiler Co. Ltd.Harbin 150040China

NOx and N2O emissions from an ultra-supercritical circulating fluidized bed(CFB)boiler were predicted using a two dimensional(2-D)comprehensive computational fluid dynamics(CFD)combustion *** model was developed from a three dimensional model for a supercritical CFB boiler previously constructed by our *** on an analysis of the NOx and N2O conversion processes in a CFB boiler,the primary formation and destruction reactions were introduced into the 2-D model and *** resulting model was validated using data from the Baima 600 MW supercritical CFB boiler,and then applied to a 660 MW ultra-supercritical CFB *** effects of excess air,the secondary air(SA)to(primary air(PA)plus SA)ratio and the SA injection height on NOx and N2O emissions were *** results show that a higher excess air volume increases both NOx and N2O emissions,while increasing the SA/(PA+SA)ratio somewhat reduces both the NOx and N2O *** the basis of the results of this work,optimal locations for SA injection ports so as to lower NOx and N2O emissions are recommended.

关键词： NOx/N2O emissions 2-D comprehensive combustion model Circulating fluidized bed Ultra-supercritical

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