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  • 超超临界汽轮机循环水系统改造及运行优化

    针对某电厂循环水系统存在的运行调整空间有限、厂用电率高和经济性差的问题,对循环水系统进行了改造并开展了汽轮机组微增出力、循环水泵在不同运行方式下的冷却水流量、循环水泵耗功以及凝汽器变工况试验研究,获得了循环水系统的经济调度运行方式,保证了汽轮机达到或接近最经济真空运行....

    2020-11-10 09:33:08浏览:32 汽轮机循环水系统改造微增出力经济调度steamturbinecirculatingwatersystemmodificationMicro

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  • Ethanol steam reforming over Ni-Cu/Al2O3-MyOz (M=Si,La,Mg,and Zn) catalysts

    Ni-based catalysts doped with copper additives were studied on their role in ethanol steam reforming reaction.The effects of Ca content,support species involving Al2O3-SiO2,Al2O3-MgO,Al2O3-ZnO,and Al2O3-La2O3,on the catalytic performance were studied.Characterizations by TPR,XRD,NH3-TPD,XPS,and TGA indicated that catalysts 30Ni5Cu/Al2O3-MgO and 30NiSCu/Al2O3-ZnO have much higher H2 selectivity than 30NiSCu/Al2O3-SiO2,as well as good coke resistance.H2 selectivity for 30Ni5Cu/Al2O3-MgO catalyst was 73.3% at 450℃ and increased to 94.0% at 600 ℃,whereas for 30NiSCu/Al2O3-ZnO catalyst,the H2 selectivity was 63.6% at 450 ℃ and 95.2% at 600 ℃.These Al2O3-MgO and Al2O3-ZnO supported Ni-Cu bimetallic catalysts may have important applications in the production of hydrogen by ethanol steam reforming reactions....

    2020-10-22 17:35:41浏览:27 ethanolsteamreformingnickel-copper-basedcatalystAl2O3-SiO2support

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  • La2O2CO3 supported Ni-Fe catalysts for hydrogen production from steam reforming of ethanol

    La2O2CO3 was prepared by calcination of La2 (CO3)3 in the air.Catalysts Ni-Fe/La2O2CO3 with different mole ratios of Ni to Fe,Ni/La2O2CO3 and Fe/La2O2CO3 were prepared by impregnation method.The catalytic properties were evaluated on steam reforming of ethanol (SRE) from 300 to 700 ℃ under atmospheric pressure and the samples were characterized by Brunauer-Emmett-Teller method (BET),X-ray diffraction (XRD) and temperature programmed reduction (TPR).The results showed that Ni-Fe bimetallic catalysts exhibited higher activities than single metallic catalysts,which was attributed to the co-existence of well dispersed Ni,Fe and LaFeyNi1 yO3.It was found that the catalyst Ni-Fe/La2O2CO3 containing 10 wt.% Ni and 3 wt.%-5 wt.% Fe showed the best performance,the conversion of ethanol was 100%,the selectivity of H2 was higher than 90%,and the selectivity of CO was lower than 1.5% at 400 ℃....

    2020-10-22 17:35:41浏览:49 hydrogenproductionsteamreformingofethanolNi-FeLa2O2CO3rareearths

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  • NiO-Ce0.5Zr0.5O2 catalysts prepared by citric acid method for steam reforming of ethanol

    NiO-Ce0.5Zr0.5O2catalysts were prepared by citrate method and used for hydrogen production from steam reforming of ethanol (SRE). The effect of nickel content and space velocity on the catalytic performance was investigated. The prepared catalysts were character-ized with XRD and thermal analysis techniques. 20%NiO-Ce0.5Zr0.5O2 catalyst was very active and selective for hydrogen production via SRE, in which ethanol conversion of 100% could be obtained with feed component of 20% (H2O+EtOH) and 80% N2, water/ethanol of 3/1 in molar ratio at 350 ℃. Also, the catalyst showed good stability for anti-sintering and carbon-resistance. The XRD illuminated that both NiO and Ce0.5Zr0.5O2 crystal sizes were very small in NiO-Ce0.5Zr0.5O2 catalyst, and Ce0.5Zr0.5O2 solid solution was formed....

    2020-10-22 17:35:41浏览:22 nickelCeO2ZrO2steamreformingethanolhydrogenrareearths

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  • 镍基催化剂上稻草水蒸气重整制富氢合成气

    采用浸渍法制备了SiO2,γ-Al2O3,CaO和TiO2负载的Ni催化剂,以及不同MgO含量的MgO-7.5% Ni/γ-Al2O3催化剂,利用X射线衍射和N2吸附-脱附技术表征了催化剂的结构,在固定床反应器上评价了它们在稻草水蒸气催化重整制合成气反应中的催化性能,考察了反应条件对催化剂性能的影响.结果表明,以γ-Al2O3为载体时Ni催化剂活性最高,其中7.5% Ni—-Al2O3催化剂的H2收率可达1071.3ml/g,H2∶CO的体积比为1.4∶1;同时,MgO的添加进一步提高了该催化剂的性能,当MgO含量为1.0%时,H2收率可达1194.6ml/g,H2∶CO体积比可达3.9:1.可见MgO的加入促进了Ni基催化剂上稻草水蒸气催化重整制合成气反应的进行,同时使得合成气中CO发生水-汽转换反应,从而大大提高了合成气中H2含量....

    2020-10-02 20:35:09浏览:46 镍基催化剂稻草水蒸气重整合成气氢气nickel-basedcatalystricestrawsteamreformingsyngas

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  • 天然气蒸汽转化改造制乙二醇合成气方案的研究

    针对国内某项目利用原先已有天然气蒸汽转化装置为新建200 kt/a煤基合成气制乙二醇工业示范装置提供备用合成气源的改造要求,提出了纯氧配CO2和水蒸气、纯氧配CO2,纯氧等3种可行方案,通过对一、二段转化炉、烧嘴及炉体材料等指标进行对比,并对不同方案改造后各装置运行情况及实际生产能力、不同方案投资及技术经济指标进行了测算,最终选择纯氧配CO2和水蒸气方案.该方案可以实现稳定供应原料气的目的,装置可在不同工况下保持较高的乙二醇生产平均负荷(工况1,2为满负荷生产),合成氨产量可达1.1 kt/d,方案总投资3 083.0万元,有项目和增量所得税后净利润分别为3.8,2.3亿元/a,投资回收期1.1a.该方案具有投资整体省、经济效益优的特点.改造后装置运行平稳、操作简单,达到增产乙二醇及合成氨的目的....

    2020-10-02 20:35:09浏览:28 天然气蒸汽转化合成氨乙二醇改造技术经济指标naturalgassteamreformingsyntheticammoniaglycol

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  • 生物质炭水蒸气气化制取合成气

    在常压固定床反应器中,以生物质炭为原料进行水蒸气气化制取合成气研究.实验在温度800 ~ 1000℃和水蒸气流量0.083 ~ 0.285g/(min·g char)条件下进行,反应时间为15min,研究反应温度和水蒸气流量对生物质碳转化率、合成气产率及合成气组分的影响.研究结果表明:生物质炭水蒸气气化具有很高的反应活性,气体产率在0.40 ~ 2.97L/g之间;温度和水蒸气流量对碳转化率和合成气热值及组分影响显著;在反应温度1000℃、水蒸气流量0.285g/(min·g char)时,碳转化率达到最高值78.7%;气体产物主要由H2、CO、CO2和CH4组成,合成气热值在8.9 ~ 9.6MJ/Nm3之间,合成气中(H2 +CO)在68% ~ 80%之间,(H2/CO)在3.1 ~6.4之间....

    2020-10-02 20:35:09浏览:59 生物质炭水蒸气气化合成气biomass-derivedcharsteamgasificationsynthesisgas

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  • 动力煤选煤厂选煤工艺现状及展望

    为建立先进、高效、大型化的动力煤选煤厂,分析了动力煤分选的特点,论述了入料原煤不同粒度下的动力煤选煤工艺优缺点及应用情况,并对动力煤选煤工艺进行展望.动力煤分选具有产品结构多元化;以提高精煤发热量,排除矸石及杂物为目的;对产品水分的要求严格;分选盈利性较差等特点.采用50 mm以上块煤和末煤分级入选,减少细粒原煤及系统煤泥入选量,特别减少<3 mm入选量,可实现动力煤选煤厂精煤产率最大化.开发先进、高效、大型化、低能耗的煤泥水处理工艺及设备;研究高效率、细粒径的干法深度筛分设备,提高筛分效率;开发高效的浓缩分级浮选工艺和设备是动力煤选煤厂的发展趋势....

    2020-09-18 16:34:07浏览:17 动力煤分选工艺煤泥水脱水steamcoalseparationprocessSlimewaterdehydration

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  • 煤中全水分的测定

    煤中全水分是炼焦精煤中一项重要的计价指标,中国动力用煤采用收到基低位发热量计价,每增加1%的全水分将会使发热量降低260 J/g左右.准确测定煤中全水分,可减少煤炭供需双方的质量纠纷,使煤炭按质计价更科学、公正、公平,在煤炭按质计价中起到举足轻重的作用.根据多年的实践经验,提出准确测定煤中全水分可行的操作方法,以避免煤炭供需双方产生不必要的质量争议....

    2020-09-18 16:34:07浏览:34 煤中全水分炼焦精煤动力用煤计价totalMoistureincoalcokingsteamvaluation

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  • Heat calculation and numerical simulation in steam mining of permafrost gas hydrate

    Steam mining method was injecting hot steam into the borehole to heat the hydrate strata at the same time of depressurization mining,which could promote further decomposition and expand mining areas of gas hydrate.Steam heat calculation would providc the basis for the design of heating device and the choice of the field test parameters.There were piping heat loss in the process of mining.The heat transfer of steam flowing in the pipe was steady,so the heat loss could be obtained easily by formula calculation.The power of stratum heating should be determined by numerical simulation for the process of heating was dynamic and the equations were usually nonlinear.The selected mining conditions were 500-millimeter mining radius,10 centigrade mining temperature and 180 centigrade steam temperature.Heat loss and best heating power,obtained by fomula calculation and numerical simulation,were 21.35 W/m and 20 kW....

    2020-09-15 12:28:59浏览:28 gashydratessteamminingheatlossnumericalsimulationbestpower

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  • Kinetic model on coke oven gas with steam reforming

    The effects of factors such as the molar ratio of H2O to CH4 (n(H2O)/n(CH4)), methane conversion temperature and time on methane conversion rate were investigated to build kinetic model for reforming of coke-oven gas with steam. The results of experiments show that the optimal conditions for methane conversion are that the molar ratio of H2O to CH4 varies from 1.1 to 1.3and the conversion temperature varies from 1 223 to 1 273 K. The methane conversion rate is more than 95% when the molar ratio ofH2O to CH4 is 1.2, the conversion temperature is above 1 223 K and the conversion time is longer than 0.75 s. Kinetic model of methane conversion was proposed. All results demonstrate that the calculated values by the kinetic model accord with the experimental data well, and the error is less than 1.5%....

    2020-09-13 23:35:02浏览:16 cokeovengassteamreformingkineticmodelconversionrate

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  • Synthesis Gas Production from Natural Gas on Supported Pt Catalysts

    Auto-thermal reforming of methane, combining partial oxidation and reforming of methane with CO2 or steam, was carried out with Pt/Al2O3, Pt/ZrO2 and Pt/CeO2 catalysts, in a temperature range of 300-900 ℃. The auto-thermal reforming occurs in two simultaneous stages, namely, total combustion of methane and reforming of the unconverted methane with steam and CO2, with the O2 conversion of 100% starting from 450 ℃. For combination with CO2 reforming, the Pt/CeO2 catalyst showed the lowest initial activity at 800 ℃, and the highest stability over 40 h on-stream. This catalyst also presented the best performance for the reaction with steam at 800 ℃. The higher resistance to coke formation of the catalyst supported on ceria is due to the metal-support interactions and the higher mobility of oxygen in the oxide lattice....

    2020-09-13 23:35:02浏览:35 methanesteamreformingCO2partialoxidationauto-thermal

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  • 煤气化装置中蒸汽管道的设计要点分析

    蒸汽作为煤气化装置中重要的工艺及公用工程物料,对煤气化装置生产运行至关重要,本文结合煤气化装置的布置特点,对煤气化装置中不同用途的蒸汽管道的布置特点进行分析与研究,提出了煤气化装置蒸汽管道的布置要点及建议。...

    2020-07-12 21:36:56浏览:35 煤气化装置蒸汽管道设计要点coalgasificationUnitsteampipelinekeypointsofdesign

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  • 考虑清洁系数变化的循环水泵调度优化

    凝汽器清洁系数是评价凝汽器性能最重要指标,其变化对循环水泵最优化调度将产生较大影响。在分析了凝汽器水侧污垢增长简化理论模型的基础上,得到凝汽器水侧污垢随时间变化的基本规律,分析了清洁系数随运行时间和冷却水流速变化的规律,并通过某600MW超临界汽轮机凝汽器循环水泵最优化调度作为实例,对凝汽器端差、凝汽器真空随清洁系数的变化趋势进行了分析,分析结果表明,不同清洁系数对循环水系统的优化运行方式造成影响,并得到了不同负荷、不同循环水温度及不同清洁系数下循环水泵的最佳运行方式,对火电厂循环水系统的运行具有一定的指导意义。...

    2020-07-10 14:39:05浏览:29 汽轮机凝汽器清洁系数循环水优化steamturbinecondensercleannesscoefficientoptimumwater

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  • Performance assessment of a spiral methanol to hydrogen fuel processor for fuel cell applications

    A novel design of plate-type microchannel reactor has been developed for fuel cell-grade hydrogen production.Commercial Cu/Zn/Al2O3 was used as catalyst for the reforming reaction,and its effectiveness was evaluated on the mole fraction of products,methanol conversion,hydrogen yield and the amount of carbon monoxide under various operating conditions.Subsequently,0.5 wt% Ru/Al2O3 as methanation catalyst was prepared by impregnation method and coupled with MSR step to evaluate the capability of methanol processor for CO reduction.Based on the experimental results,the optimum conditions were obtained as feed flow rate of 5 mL/h and temperature of 250℃,leading to a low CO selectivity and high H2 yield.The designed reformer with catalyst coated layer was compared with the conventional packed bed reformer at the same operating conditions.The constructed fuel processor had a good performance and excellent capability for on-board hydrogen production....

    2020-07-08 21:52:19浏览:28 spiralfuelprocessorhydrogencellmethanolsteamreforming

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  • Methanol Steam Reforming Reactions on CuZn(Zr)AlO Catalyst

    The catalytic performances of methanol steam reforming reactions on CuZn(Zr)AlO catalysts were studied. When the ZrO2 promoter was added to a CuZnAlO catalyst, its methanol conversion,H2 production and H2 selectivity improved greatly. By using the #COPZr-2 catalyst as an example,which exhibited the best catalytic performance, the optimized reaction conditions were established to be:250 ℃, 0.1 MPa, H2O/MeOH=1.3, WHSV=3.56 h-1, and without carrier gas. A 150 h stability test of the #COPZr-2 catalyst showed that the catalyst had good stability, as the methanol conversion and H2 production could be kept at 88% and 83% respectively. Moreover, outlet H2 and CO contents were >63%and 0.20%-0.31%, respectively....

    2020-07-08 21:52:19浏览:32 ZrO2methanolsteamreformingCuZnAlO

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  • Methanol Steam Reforming Catalysts for Fuel Cell Driven Electric Vehicles

    Cu/ZnAlO catalysts derived from hydroxycarbonate precursors containing hydrotalcite-likelayered double hydroxides (LDHs) were studied. The influence on the performance of the catalysts wasalso studied when the Al in the Cu/ZnAlO catalyst was partly or completely replaced by Zr or Ce....

    2020-07-08 21:52:19浏览:29 methanolsteamreforminglayereddoublehydroxidesfuelcell

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  • Thermodynamic Study of Water-Steam Plasma Pyrolysis of Medical Waste for Recovery of CO and H2

    This paper describes the equilibrium compositions of the typical medical waste under high temperature pyrolysis by a steam plasma torch using the NASA CEA2 program. Various components from selected typical medical waste were input to the program along with the treatment temperature from 1000 K ~ 4100 K. The program then performed the Gibbs free energy calculations and searched for the equilibrium composition with minimizing the total system Gibbs free energy. The calculation results indicate that, the equilibrium composition of a system C-H-O at C/O = 1 in the temperature range of 1400 K ~ 2000 K has demonstrated that gas composition are CO and H2 mainly, the other components (CO2, C2H4, C2H2, CH4 etc.) is less than 1%by volume and the degree of raw material transformation is about 100%. Comparison with air plasma, the steam plasma treatment will not produce nitrogen oxides, if the materials are free of nitrogen element....

    2020-07-08 21:52:19浏览:13 steamplasmagasificationGibbsfreeenergy

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  • Development of Ni-Based Catalysts for Steam Reforming of Tar Derived from Biomass Pyrolysis

    Nickel catalysts are effective for the steam reforming of tar derived from biomass pyrolysis,but the improvement is needed in terms of activity,stability,suppression of coke deposition and aggregation,and regeneration.Our recent development of Ni-based catalysts for the steam reforming of tar is reviewed including the modification with CeO2 (or MnO),trace Pt,and MgO.The role of additives such as CeO2,MnO,Pt,and MgO is also discussed....

    2020-07-08 21:52:19浏览:19 steamreformingtarbiomassnickelceriamanganeseoxideplatinummagnesia

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  • 制备烯烃的各类原料的现状与发展前景

    长期以来,生产乙烯的原料主要为石油和天然气。目前油气价格飞涨、资源日益匮乏,非油气的多元化资源的开发利用受到各国广泛重视。文章综述了生产烯烃的各类原料的现状及发展前景。现阶段以油气资源为原料的蒸汽裂解工艺是生产乙烯的主要手段,乙醇制烯烃工艺在巴西获得重大突破,煤制烯烃工艺正在中国实现工业化,将获得较大发展。...

    2020-06-12 16:10:24浏览:1395 乙烯丙烯蒸汽裂解乙醇制烯烃煤制烯烃ethylenepropylenesteamcrackingethanoltoolefincoal

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  • 轧钢工序节能技术及节能实践

    对轧钢工序能耗的构成进行分析,指出轧钢系统的节能应以加热炉节能为重点。在分析蓄热式燃烧、涂料、热送热装、黑体强化辐射传热、钢铁企业煤气资源合理利用、变频调速技术的基础上,结合柳钢中板厂近年采取的节能措施和节能技术的应用情况,指出了今后柳钢中板厂的节能方向和对策,为其他轧钢企业节能降耗提供参考。...

    2020-06-12 16:05:56浏览:1388 节能热送热装蒸汽回收energysavinghotdeliveryandchargingsteamretrieve

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  • 中低温废热与甲醇重整结合的氢电联产系统

    提出了烧结机烟气中低温废热与甲醇蒸汽重整制氢整合的新方法,模拟建立了中低温废热结合甲醇重整制氢的系统.基于能的品位概念,采用EUD图像火用分析方法,揭示低品位的中低温废热转化为高品位化学能的能量转换特性;研究了中低温废热品位的提升随甲醇重整反应温度的变化规律.研究结果表明:新型制氢系统的火用效率有望达到82 8%,比传统甲醇制氢系统约高12个百分点,甲醇燃料节能率23.7%.另外,初步静态经济性分析表明:新系统可使氢气生产成本约为1.5元/m~3,远低于电解水制氢成本(5.5元/m~3).当甲醇原料成本价格保持在一定的价格范围内,其制氢成本可以与传统天然气制氢成本1.2元/m~3相竞争.本研究为冶金工业同时解决中低温废热利用和制氢能耗高的难题提供了一个新途径....

    2020-06-12 15:50:36浏览:1444 中低温废热甲醇蒸汽重整制氢EUD图像(火用)分析medium-and-lowtemperaturewasteheatmethanolsteam

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  • 低温甲醇洗工艺节能降耗浅析

    阐述影响低温甲醇洗系统甲醇、电、蒸汽、低压氮气、脱盐水消耗的因素,通过改进设备及优化工艺,达到节能降耗的目的。...

    2020-06-12 15:49:59浏览:1390 低温甲醇洗甲醇蒸汽低压氮气脱盐水消耗Rectisolprocessmethanolelectricitysteamlow

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  • 乙醇重整制氢技术的实验研究

    使用性能较优的10Co18La/Al2O3催化剂进行乙醇重整制氢反应,研究不同反应温度、反应空速的影响,结合反应机理进行探讨。结果表明:反应温度升高时,反应速率加快,乙醇转化率上升,氢气的选择性减小。反应空速增加时,反应速率加快,乙醇转化率下降,氢气的选择性增大。反应温度为500℃、反应空速为40 mL/(h.gcat.)时为最佳条件。...

    2020-06-12 15:08:44浏览:1393 乙醇水蒸气重整氢气ethanolsteamreforminghydrogen

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