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Effects of Co-Firing Biomass and Pulverized Coal on no reduction in Cement Precalciner

Journal of Thermal Science 2024年第2期33卷 751-760页

作者： LI Pengpeng REN Qiangqiang LYU Qinggang WANG Mingyue School of Energy Power and Mechanical Engineering North China Electric Power UniversityBeijing102206China Institute of Engineering Thermophysics Chinese Academy of SciencesBeijing100190China University of Chinese Academy of Sciences Beijing100049China

With increased awareness of the large-scale CO_(2) emissions from the cement industry,there has been growing focus on greenhouse gas reduction strategies.Among all these strategies,fuel substitution using biomass fuel is extensively used to achieve CO_(2) zero-emission in cement production.Due to the avoidable high-temperature-generated thermal nitrogen oxides during cement production,research on the impact of biomass application on nitrogen oxide emissions shall be carried out.Three types of biomass fuel and bituminous coal were used to investigate the no reduction characteristics under different O_(2) concentrations on experimental benches.It was found that the change in oxygen concentration from 9% to 1% increased the reaction time in the reactor from 555 s to 1425 s,which means the increase in oxygen concentration can lead to shorter reaction time,and correspondingly,the existing time of nitric oxide in the flue gas is also shortened,but the peak value of nitric oxide rises,during the process of O_(2) concentration changing from 1% to 9%,the peak NO concentration in the flue gas increased from 5.4×10^(-5) to 1.05×10^(-4).An increase in O_(2) concentration greatly reduces the total reduction of NO and the minimum change in NO concentration.The peak NO concentration during the combustion process of corn stalk is 4.56×10^(-4),which is approximately 7 times higher than that of coal,and it is caused by the high amount of N in corn stalk.The addition of raw meal has an inhibitory effect on the reduction of NO:after adding raw meal,the effective reduction time of NO by fuel decreased by about 20%,but adding raw meal raises CO_(2) concentration of fuel gas in the early stage of reaction.

关键词： cement precalciner biomass fuel coal no reduction co-firing

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Characteristics of no reduction with non-thermal plasma

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Journal of Environmental Sciences 2005年第4期17卷 627-630页

作者： YUGang YUQi JIANGYan-long ZENGKe-si DepartmentofMan-MachineandEnvironmentEngineering CollegeofAerospaceEngineeringNanjingUniversityofAeronauticsandAstronauticsljing210016China DepartmentofEnvironmentalandChemicalEngineering WuhanInstituteofScienceandTechnologyWuhan430074China

As a new type of NO removal system, no reduction in N_2-NO plasma was applied to solve the difficulties in the traditional methods, such as higher energy-consumption, larger equipment size and high cost, and so on. Using the experimental no reduction system with single-pair electrode tip discharge structure, the no reduction characteristics of N_2-NO system were revealed to guide the engineering practice; the results of no reduction with single-pair electrode tip discharge plasma also have the same instructive meaning to the no reduction with multi-pair electrode tip discharge plasma. The amount of both active N atom and NO removal rate increased with the distance l_g increasing between the two electrode tips and then dropped when the distance exceeded a certain value. The NO removal rate increased while the voltage between two electrode tips or the resident time of gas flow increased. The distance is a key geometrical variable factor that can determine the intensity of electric field between two electrode tips and the resident time of gas. In this paper, the effects of the dielectric features on no reduction using dielectric-barrier discharge plasma system were also studied. The results of NO removal rate with different dielectrics such as Al_2O_3, CaO, MgO and glass showed that the electric field intensity is different with different dielectric, because it brings different energy to particles in discharge room and thus it causes different NO removal rate.

关键词： no reduction plasma characteristic single-pair electrode tip discharge dielectric-barrier discharge

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Mechanism of no reduction with non-thermal plasma

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Journal of Environmental Sciences 2005年第3期17卷 445-447页

作者： YUGang YUQi JIANGYan-long ZENGKe-si GUFan DepartmentofMan-MachineandEnvironmentEngineering CollegeofAerospaceEngineeringNanjingUniversityofAeronauticsandAstronauticsNanjing210016China DepartmentofEnvironmentalandChemicalEngineering WuhanInstituteofScienceandTechnologyWuhan430074China GenerationandCombustionTechnologySoutheastUniversity Nanjing210096China

Non-thermal plasma has been proved to be an effective and competitive technology for removing NO in flue gas since 1970. In this paper, the no reduction mechanism of the non-thermal plasma reaction in NO/N_2/O_2 system was investigated using the method of spectral analysis and quantum chemistry. By the establishment of no reduction and gas discharge plasma emission spectrum measuring system, the no reduction results, gas discharge emission spectra of NO/N_2/O_2 and pure N_2 were obtained, and then the model of molecular orbit of N_2 either in ground state or its excited state was worked out using the method of molecular orbit Ab initio in Self-Consistent Field(SCF). It was found that no reduction in NO/N_2 gas discharge plasma was achieved mainly through a series of fast elementary reactions and the N(E6) at excited state was the base for no reduction.

关键词： no reduction plasma mechanism spectral analysis quantum chemistry

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Promotional effect of CO pretreatment on CuO/CeO_2 catalyst for catalytic reduction of NO by CO

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Journal of Rare Earths 2014年第2期32卷 139-145页

作者：顾贤睿李昊刘礼晨汤常金高飞董林 Key Laboratory of Mesoscopic Chemistry of MOE School of Chemistry and Chemical EngineeringNanjing University Center of Modern Analysis Nanjing University

The CuO/CeO2 catalysts were investigated by means of X-ray diffraction （XRD）, laser Raman spectroscopy （LRS）, X-ray photoelectronic spectroscopy （XPS）, temperature-programmed reduction （TPR）, in situ Fourier transform infrared spectroscopy （FTIR） and NO＋CO reaction. The results revealed that the low temperature （〈150℃） catalytic performances were enhanced for CO pretreated samples. During CO pretreatment, the surface Cu＋/Cu0 and oxygen vacancies on ceria surface were present. The low va- lence copper species activated the adsorbed CO and surface oxygen vacancies facilitated the NO dissociation. These effects in turn led to higher activities of CuO/CeO2 for no reduction. The current study provided helpful understandings of active sites and reaction mechanism in NO＋CO reaction.

关键词： CuO/CeO2 catalysts CO pretreatment oxygen vacancies no reduction rare earths

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Promotional effect for SCR of NO with CO over MnO_(x)-doped Fe_(3)O_(4) nanoparticles derived from metal-organic frameworks

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Chinese Journal of Chemical Engineering 2022年第6期35卷 113-125页

作者： Yu Zhang Ling Zhao Ziang Chen Xinyong Li School of Ecology and Environment Inner Mongolia UniversityChina School of Environmental Science&Technology Dalian University of TechnologyChina College of Veterinary Medicine University of FloridaUnited States

MnO_(x)-Fe_(3)O_(4) nanomaterials were fabricated by using the innovative scheme of pyrolyzing manganesedoped iron-based metal organic framework in inert atmosphere and exhibited extraordinary performance of no reduction by CO(CO-SCR).Multi-technology characterizations were conducted to ascertain the properties of fabricated materials(e.g.,TGA,XRD,SEM,FT-IR,XPS,BET,H_(2)-TPR and O_(2)-TPD).Moreover,the interaction between reactants and catalysts was ascertained by in situ FT-IR.Experimental results demonstrated that Mn was an ideal promoter for iron oxides,resulting in decrease of crystallite size,improve reducibility property,enhance the mobility and the amount of lattice O^(2-) species,as well as strength the adsorption ability of active NO and CO to form multiple species(e.g.,nitrate and carbonate).The unprecedented enhancement of CO-SCR activity over Mn-Fe nanomaterials follows the Eley-Rideal(E-R)and Langmuir-Hinshelwood(L-H)reaction pathway.

关键词： Metal-organic framework MnO_(x)-doped Fe_(3)O_(4) no reduction In situ FT-IR Reaction mechanism

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Ce-Ti catalysts modified with copper and vanadium to effectively remove slip NH_(3) and NO_x from coal-fired plants

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Journal of Rare Earths 2023年第7期41卷 1022-1030,I0002页

作者： Wenjie Liu Yifei Long Shinian Liu Yongyan Zhou Xin Tong Yajie Yin Xiaoyi Li Kang Hu Jiangjun Hu School of Resource and Environmental Sciences Wuhan UniversityWuhan 430079China China Southern Power Grid Technology Co. Ltd.Guangzhou 510080China Electric Power Research Institute of Guangdong Power Grid Co.Ltd. Guangzhou 510080China

In this work,V/Ce-Ti catalysts were modified with different kinds of transition metals(Cu,Fe,Co,Mn) by sol-gel and impregnation methods.The NH_(3) oxidation performance of them was tested to select the most active catalyst in NH_(3)-selective catalytic oxidation(NH_(3)-SCO).The effect of NO,SO_(2) and H_(2)O was also investigated.The experimental results indicate that 1% Cu-V/Ce-Ti catalyst exhibits the most significant ability to remove slip ammonia discharged from coal-fired plants and its NH_(3) conversion efficiency reaches90% at 300℃.In additio n,97% NO_x can be removed when NO is introduced in the gas.Cu-V/Ce-Ti catalyst also obtains good resistance to H_(2)O and SO_(2).Based on the characterization experiment,the introduced Cu and V are highly dispersed on Ce-Ti catalyst and they can increase the redox properties and the number of acidic sites.Besides,the redox cycles among Cu,V and Ce species on Cu-V/Ce-Ti catalyst surface are conducive to generating more active oxygen and promoting the oxidation capacity of the catalyst.

关键词： Ce-Ti catalyst Transition metals Slip ammonia no reduction Rare earths

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no reduction with ammonia over carbon nanotube-supported vanadium oxide catalysts at low temperature

NO reduction with ammonia over carbon nanotube-supported van...

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第十三届全国催化学术会议

作者： Shuli Bai, Jianghong Zhao, Jianfeng Zheng, Li Li, Shouai Feng, Zhenping Zhu (State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, CAS, Taiyuan 030001)

＜正＞1. Introduction Carbon nanotubes （CNTs） possess many excellent properties, such as high surface area, high thermal stability, high electrical conductivity, the inherent hollow geometry and proper chemical inte... 详细信息

关键词： Carbon nanotube vanadium oxide no reduction Ammonia SO2 promotion

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Synthesis of Nd_(2-x)Sr_xCoO_(4±λ)(x=0.4～1.2) and Catalytic Properties in reduction of NO

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Journal of Rare Earths 2005年第6期23卷 679-679页

作者： Zhong Hua Luo Laitao Yang Xiaomao Shao Guangxin Department of Chemistry Nanchang University Nanchang 330047 China Department of Chemistry Jinggangshan College Ji＇an 343100 China Institute of Materials Jiangxi University of Finance ＆ Economics Nanchang 330013 China

The mixed oxides, Nd2-xSrxCoO4±λ（0.4 ≤ x≤ 1.2）, with K2NiF4 structure were synthesized by the polyglycol gel method. The composition and structure of the catalysts were characterized by means of IR, TPD, TPR, chemical analysis and so on. The catalytic performance for no reduction was investigated. The results show that the mixed oxides have K2NiF4 structure. Other phases are found when x = 1.2. The amount of Co^3＋ and the lattice oxygen over Nd2-xSrxCoO4±λ increase with the increase of x. It is found that the catalytic activity for no reduction is closely correlated with the concentration of oxygen vacancies and the amount of Co^3＋ .

关键词： A2BO4 Co-containing mixed oxide no reduction rare earths

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Detailed in-furnace measurements with reburning of superfine pulverized coal in high CO_(2)concentration

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Journal of Environmental Sciences 2021年第6期33卷 326-334页

作者： Jun Shen Jiaxun Liu Shengxiang Deng Sha Wang Bin Chen Xiumin Jiang School of Mechanical and Automotive Engineering Shanghai University of Engineering ScienceShanghai 201620China School of Mechanical Engineering Shanghai Jiao Tong UniversityShanghai 200240China

This paper presents detailed measurements of gaseous species during the reburning process with high CO_(2)concentration in a bench-scale furnace.Superfine pulverized coal,with the average particle size below or around 20μm,is used as the reburning fuel.The data of flue gas concentration(NOx,HCN,NH_(3),CH_(4),O_(2),CO,CO_(2)etc.)is obtained in order to reveal the intrinsic connection between NOx emissions and other influential gaseous species at different positions of the furnace.The finding concludes that the advantage of superfine pulverized coal with regard to no reduction is more efficient in homogeneous stage rather than heterogeneous stage.Meanwhile,the evolution of HCN and CH_(4)agrees well with each stage of no reduction,which indicates that these gaseous species are favorable for NO abatement.Eventually,oxygen consumption rate for superfine pulverized coal is relatively faster,conducive to strengthen both homogeneous and heterogeneous no reduction under CO_(2)reburning condition.

关键词： no reduction Superfine pulverized coal Coal combustion Reburning in CO_(2)

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Catalytic reduction of NO by CO over NiO/CeO2 catalyst

Catalytic reduction of NO by CO over NiO/CeO2 catalyst

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第十一届全国青年催化学术会议

作者： Yong Wang,Aimin Zhu,Nan Zheng,Xiaoqing Cheng,Chuan Shi (Laboratory of Plasma Physical Chemistry, Dalian University of Technology,Dalian 116024)

＜正＞A new catalyst composed of nickel oxide and cerium oxide was studied with respect to its activity for no reduction by CO under stoichiometric conditions. NiO/CeO2 catalyst was very active, and complete conversio... 详细信息

关键词： no reduction CO NiO/CeO2 catalyst

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