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  • GB/T 15519-2002化学转化膜 钢铁黑色氧化膜 规范和试验方法Chemical conversion coatings--Black oxide coating on iron and steel--Specification and test methods

    本标准规定了铁和钢(包括铸铁、锻铁、碳钢、低合金钢和不锈钢)上的黑色氧化膜的要求。黑色氧化膜可用来减小滑动面或支承面间的摩擦,或用于装饰,或减少光反射。这种膜无论是否经过附加防腐处理,都可用于需要黑色表面的地方;即使经过附加防腐处理,在轻度腐蚀条件下,也仅能获得很有限的腐蚀防护性能。本标准对黑色氧化前基材的状态、加工和表面粗糙度没有规定要求。...

    2022-06-14 11:02:47浏览:6 氧化膜conversionspecification

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  • GB/T 40870-2021气体分析 混合气体组成数据的换算Gas analysis. Conversion of gas mixture composition data

    GB/T 40870-2021气体分析 混合气体组成数据的换算Gas analysis. Conversion of gas mixture composition data...

    2022-03-14 21:39:46浏览:13 compositionconversion气体组成

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  • 压铸镁合金植酸转化处理中添加剂的研究

    通过在植酸基础转化液中添加两种不同组成的成膜促进剂制备镁合金植酸转化膜,采用SEM、EDS及失重法研究了添加剂对转化膜结构、形貌及耐蚀性能的影响.结果表明:经植酸转化处理后,镁合金表面耐蚀性能均得到了大幅提高,120 h盐水浸泡后失重率仅为镁合金基材的1/5;Ca(NO3)2、NH4VO3及Na2C4 H4O6·2H2O组合添加剂的加入有利于改善膜层结构和致密性,转化膜由完整、致密且与基材结合紧密的内层和网纹的外层组成,耐蚀性能较纯植酸转化膜提高1倍,而NaF、Na2B4O7及Na2C4H4O6·2H2O的组合添加剂则对转化膜结构和耐蚀性能影响不显著....

    2020-12-06 21:11:24浏览:19 镁合金添加剂植酸转化膜失重率magnesiumalloyadditivephyticacidconversioncoating

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  • 黏胶纤维厂冷却循环水系统变频节能改造

    针对黏胶纤维厂冷却循环水系统存在的能源浪费, 根据冷却水泵运行特点, 对冷却循环水系统变频节能改造, 有效解决能源浪费的问题....

    2020-11-10 09:33:08浏览:24 冷却循环水变频节能智能控制coolingcirculatingwaterfrequencyconversionenergysaving

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  • 变频调速技术在电厂循环水系统中的应用

    针对电厂循环水泵存在的低效、高能耗状况,研究将循环水泵由原来的工频运行方式改为变频控制,提高系统负载运行效率,延长备件使用寿命,最终达到最佳的节能效果。...

    2020-11-10 09:33:08浏览:23 变频控制循环水节能寿命frequencyconversioncontrolcirculatingwaterpumpenergysaving

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  • 天然气换热式转化制合成气催化剂的选用

    论述了制合成气过程催化剂的选择及重要性,转化催化剂要求有较好的低温活性和抗积炭性能,中变催化剂考虑催化剂本体含硫量,低变催化剂要从活性、热稳定性、堆积密度、还原后体积收缩率、烧失重和自由水含量等方面衡量,甲烷化催化剂的选用要根据设备状况满足工艺要求方面考虑.催化剂的使用寿命既与合理选用催化剂有重要关系,也与工业应用过程中的正确使用和维护有关....

    2020-10-02 20:35:09浏览:22 化肥工程技术转化催化剂中变催化剂低变催化剂甲烷化催化剂使用寿命fertilizerengineeringconversioncatalyst

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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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  • Progress in studies of natural gas conversion in China

    Progress in natural gas conversion in China is presented in this paper, including processes of natural gas to synthesis gas (syngas), syngas to liquid hydrocarbons, oxygenates synthesis, methanol to olefins (MTO), methane to aromatics and oxidative coupling of methane (OCM)....

    2020-09-13 23:35:02浏览:34 methanenaturalgasconversionGTLsynthesishydrocarbonsalcoholsOlefins

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  • 风机变频改造节能技术

    变频改造大大提高了设备的安全运行水平,减少轴承磨损,延长电机等电器设备使用寿命;避免意外停机带来的损失,降低运营成本;进一步提高了设备自动化水平,减轻了员工的劳动强度;降低环境噪音,改善现场工作环境,为企业清洁生产打下了良好的基础。...

    2020-09-13 23:35:02浏览:24 风机变频变频调速节能fanfrequencyconversioncontrolofmotorspeedenergy

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  • Studies on Catalyst Deactivation Rate and Byproducts Yield during Conversion of Methanol to Olefins

    The conversion of methanol to olefins (MTO) over the SAPO-34 catalyst in fixed-bed microreactor was studied. The effect of reaction temperatures for methanol conversion to olefins and byproducts was investigated. A temperature of 425 ℃ appeared to be the optimum one suitable for conversion of methanol to olefins. Since the presence of water could increase the olefins selectivity, the methanol conversion reactions with mixed water/methanol feed were also studied. The effect of weight hourly space velocity on conversion of methanol was also studied. The results indicated that the olefins selectivity was significantly increased as WHSV increased till approximately 7.69 h-1 then it began to level off. Different factors affecting the catalyst deactivation rate was studied, showing that the catalyst deactivation time was dependent on reaction conditions, and temperatures higher and lower than the optimal one made the catalyst deactivation faster.Adding water to methanol could slow down the catalyst deactivation rate....

    2020-07-08 21:52:19浏览:24 methanolconversioncatalystdeactivationSAPO-34MTO

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  • Conversion of Methanol Using Modified H-MOR Zeolite Catalysts

    The conversion of methanol was carried out over various mordenite zeolite catalysts to evaluate their catalytic performance. A post-preparation treatment of the H-MOR catalyst by halogenation with NH4Cl or NH4F and by hydrohalogenation with HCl or HF was carried out and its effect on methanol conversion reactions at 100-300 ℃ in a continuous flow reactor was investigated. The as-synthesized H-mordenite (H-MOR) is generally more active during dimethyl ether (DME) production than the NH4-MOR and Na-MOR. Fluorinated treatment with HF or NH4F significantly improved the catalytic activity during methanol conversion and the formation of DME in comparison to chlorinated treatments with HCl or NH4Cl. This is principally attributed to the higher Si/Al ratio and an increase in the number of acid sites and their strength. Halogenation treatment with the acids of both F- or Cl- gave the highest conversion activity for DME production compared to halogenation treatments with the salts of the same halogens. Zeolite dealumination by the acids was more profound than that by the halogen ion salts, which resulted in a decrease in the crystallinity and crystallite sizes of the zeolite....

    2020-07-08 21:52:19浏览:16 methanolconversionH-MORhalogenationhydrohalogenation

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  • Study of Methanol Conversion over Fe-Zn-Zr Catalyst

    The methanol conversion over Fe-Zn-Zr catalyst was studied at 0.1 MPa and 280-360℃.The experimental results indicate that the main products of methanol conversion are methane and butane,and that other hydrocarbons are scarcely produced.All results show that propylene is most probably the olefin formed first in methanol conversion rather than ethene over Fe-Zn-Zr catalyst.Methane is formed from methoxy group,and C4 is possibly yielded on the surface from propylene through binding with a methoxy group....

    2020-07-08 21:52:19浏览:12 methanolconversionFe-Zn-Zrcatalyst

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  • Continuous conversion of methanol to higher hydrocarbons at ambient pressure

    An iodozincate ionic liquid solvent and catalyst is used to convert methanol continuously to a wide variety of hydrocarbons at atmospheric pressure....

    2020-07-08 21:52:19浏览:25 methanolconversionzinciodidehydrocarbonformation

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  • Catalytic Conversion of Methanol by Oxidative Dehydrogenation

    This study investigates the effects of addition of oxygen on the oxidative dehydrogenation (ODH) of methanol when a fluorotetrasilicic mica ion-exchanged with palladium (Pd2+-TSM) was used as the catalyst. The reaction proceeded at a very low temperature in the presence of oxygen, and HCOOCH3 was obtained at high selectivity. By calculating the equilibrium conversion, it has been shown that substantial ODH took place for HCOOCH3 production. Consequently, this reaction would make dehydrogenation the dominant reaction at equilibrium. Not all the H dissociated from CH3OH was converted to H2O by oxidation. It has been shown that the H2O was not produced from oxidative dehydrogenation by the direct reaction of CH3OH and O2 when an attempt was made to carry out oxidative dehydrogenation using an isotope oxygen trace method in the gas phase. Therefore, when CH3OH was converted to CO2 and dehydrogenated to HCOOCH3, the C-O bonds were not dissociated....

    2020-07-08 21:52:19浏览:36 C1chemistryconversionmethanoloxidativedehydrogenationcatalysis

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  • New progress in the processing and efficient utilization of coal

    Coal accounts for about 70% of the primary energy sources in China.The environmental pollution and resources waste involved with coal processing and utilization are serious.It is therefore urgent to develop highly-efficient coal resources utilization theory and methods with low-carbon discharge.Based on our long-term basic research and technology development,the progress in beneficiation,cleaning,and transformation of coal,which includes dense phase fluidized bed dry beneficiation,deep screening of wet fine coal,micro-bubble flotation column separation,molecular coal chemistry,and transformation and separation of coal and its derivatives into value-added chemicals under mild conditions,is discussed....

    2020-06-12 16:16:30浏览:1386 coallow-carbondischargeseparationconversion

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  • 我国生物质能源利用现状

    发展储量巨大的可再生生物质能可以帮助缓解世界能源危机,扭转由于大量化石燃料使用造成全球环境恶化的趋势。对生物质进行了分类,介绍了现代生物至能的3种生产转化方式、相应产品及其应用情况,分析各种生物燃料的优缺点和所面临的挑战,进一步指出生物质能的开发利用,对于我国能源结构调整、能源安全以及环境保护具有十分重要的意义。...

    2020-06-12 15:42:58浏览:1393 生物质转化途径能源biomassconversionrouteresourcefuels

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  • 双乙烯基二乙二醇醚的制备

    采用乙炔法,以金属钾为催化剂合成双乙烯基二乙二醇醚,考察了影响转化率的主要因素。结果表明,钾具有良好的催化活性,催化剂用量为反应物质量的8%,反应时间为8h,反应温度175℃时,转化率可达60%。...

    2020-06-12 14:59:20浏览:1404 乙炔法转化率双乙烯基二乙二醇醚CarbideFranceconversionrateDi-ethyleneglycoldivinyl

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  • 双乙烯基二乙二醇醚的制备

    采用乙炔法,以金属钾为催化剂合成双乙烯基二乙二醇醚,考察了影响转化率的主要因素。结果表明,钾具有良好的催化活性,催化剂用量为反应物质量的8%,反应时间为8h,反应温度175℃时,转化率可达60%。...

    2020-03-23 18:27:50浏览:1409 乙炔法转化率双乙烯基二乙二醇醚CarbideFranceconversionrateDi-ethyleneglycoldivinyl

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