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短接触
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  short contact
    A Study on Direct Synthesis of Acetic Acid from CBM and CO_2 by Two-Step Reaction Sequence in the Way of "Short Contact" and in the Presence of Water
    “短接触”和水蒸气存在下的煤层CH_4和CO_2两步反应直接合成乙酸的研究
短句来源
    In present efforts, the method of multi-stage, crossover-flow and short-contact stripping (short for MCSS) was developed to reduce hydrothermal degradation, which entrained flue gas is rapidly degassed and stripped in staged degassing tower with degassing tube and stripping baffles, so that steam and stripped flue gas have short contact with catalyst particles when flow upward through the catalyst bed.
    由此,提出了多级错流短接触汽提方法,通过脱气管和多孔挡板的组合实现快速脱气和高效汽提,在提高烟气脱除率的同时,控制水蒸气与催化剂在脱气塔内的接触时间,缓解催化剂水热减活。
短句来源
    Main conclusionsachieved are showed as following:(1) The "short contact" reaction can effectively restrain the formation of by-products and improve the selectivity to the aimed products in the two-step reaction convertion of CH4-CO2. And the "short contact" reaction applied to hydrogenation of CO2 or CO can also raise the formation rate and the selectivity of the aimed alcohol.
    (1)在两步反应间隙加入惰性气体吹扫的“短接触”反应可太原理工大学硕士研究生学位论文以有效地抑制C执一CO:两步反应副产物的产生,提高目的产物的选择性。 在CO:或CO加氢中使用“短接触”反应同样可以提高目的醇收率和选择性。
短句来源
    The rather uniform gas solid two phase flow structure is due to the fact that gas and solid are flowing in the same direction as gravity. Compared with riser reactors, downer reactors have improved gas solid contact efficiency and can accommodate ultrashort contact time reactions, so that the downer reactor is a new high efficiecy gas solid short contact reactor.
    和循环床提升管相比,下行管反应器气固两相沿径向分布的不均匀性得到有效地改善,气固可以实现超短接触操作,因而是一种新型高效气固超短接触反应器
短句来源
  “短接触”译为未确定词的双语例句
    Quick - Contact Reactor and Development of Pyrolysis Furnace
    乙烯技术发展与超短接触反应器
短句来源
    Under the conditions of solid mass flux ranging from 10 to 50 kgm~s' and stripping gas velocity from 0.1 to 0.2m~s1, the stripping efficiency for three-stage proposed structure could reach 90%, while 50~60% for non-internals and 70-~S0% for ordinary baffles.
    冷模实验采用三级错流短接触结构,在催化剂空塔质量流率10~50kg·m~2·s~(-1),汽提介质空塔流速0.1~0.2m·s~(-1)条件下,能达到90%的脱气效率,该效率比无构件时的效率提高了40%,比普通挡板结构提高了10%。
短句来源
    FUNDAMENTAL RESEARCH AND APPLICATION PROSPECTS OF THE QUICK-CONTACT REACTOR
    超短接触反应器基础研究与应用展望
短句来源
    The cold model experimental results indicated that the MCSS degassing tower keeps the contact between catalyst and steam within two stages.
    冷模实验表明:多级错流短接触汽提方法能将汽提介质与催化剂的接触时间控制在两级挡板之内。
短句来源
    Taken into account of dense gas-solid flow in degassing tower, a computational fluid dynamics model based on a two-fluid model including the kinetic theory of granular flow was implemented in the commercial code CFX to describe solid viscosity and solid pressure caused by the collisions between the particles. The model was applied to study the behaviors of gas-solid flow in a two-dimensional MCSS degassing tower.
    根据脱气塔中颗粒浓度高的特点,将颗粒动力学理论加入到流体力学模拟计算软件CFX的双流体模型中,计算颗粒碰撞产生的颗粒粘度和颗粒压脱除再生催化剂携带烟气的研究力,对二维错流短接触脱气塔中的气固流动行为进行了模拟计算。
短句来源
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  short contact
Kinetics of decomposition of hydrated nitrates by short contact time plasma heating
      
The experimental results for hydrocarbon oxidation on platinum-containing fiberglass gauzes at short contact times are discussed.
      
Selective oxidation of hydrocarbons into synthesis gas at short contact times: Design of monolith catalysts and main process par
      
It is shown for short contact times between the solutions and the crystallization surface that the character of their flow in the channel plays an important role in the achievement of uniformity in the physical characteristics of the layers grown.
      
Transient heat transmission through disperse media during short contact times
      
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Some problems, such as high chark percentage, high energy consumption, low stability of light diesel in storage and the impact of water effluent with sulphur content on sewage treatment installation are often found in heavy oil catalytic cracking process. These problems have been solved by adopting the advanced technology at home and abroad of highly efficient double regeneration, short contact time at high temperature with large oil and catalyst ratio, efficient spray nozzles, quick interruption of reaction,...

Some problems, such as high chark percentage, high energy consumption, low stability of light diesel in storage and the impact of water effluent with sulphur content on sewage treatment installation are often found in heavy oil catalytic cracking process. These problems have been solved by adopting the advanced technology at home and abroad of highly efficient double regeneration, short contact time at high temperature with large oil and catalyst ratio, efficient spray nozzles, quick interruption of reaction, preextraction of light hydrocarbon, recovery of energy in recycled gas and stripping sulphur content from water effluent, etc. The chark percentage is reduced by 1%~2% (Absolute Value). The energy consumption is reduced from 6190.2GJ/t to 3380.0 GJ/t. It is pointed out that it is necessary to make further decreasing of chark content and energy consumption as well as to make better treatment of SO_x and NO_x in recycled gas.

针对重油催化裂化生产工艺存在生焦率高、能耗高、轻柴油贮存安定性差、含硫污水冲击污水处理场等问题,采用两级高效再生,大剂油比高温短接触时间,高效雾化喷嘴、快速中止反应、轻烃预提升、再生烟气能量回收、含硫污水汽提等国内外先进技术,解决了生产中存在的这些问题。使生焦率下降了1%~2%(绝对值),能耗从6190.2GJ/t降至3380.0GJ/t。指出今后应进一步降焦、降能耗,治理再生烟气中的SO_x和NO_x。

Cocurrent downflow circulating fluidized bed(CDCFB)is a new type of gas一solids quickcontact reactor. Within the CDCFB of internal diameter 0.14m,a unique phosphor tracertechnique has been developed which permits the continuous determination of solid tracer concentration with time at different radial and axial positions.Solids mixing has been described byaproposed two dimensional plug flow dispersion model satisfactorily. The radial and axial dis-persion coefficients at various operating conditions have been...

Cocurrent downflow circulating fluidized bed(CDCFB)is a new type of gas一solids quickcontact reactor. Within the CDCFB of internal diameter 0.14m,a unique phosphor tracertechnique has been developed which permits the continuous determination of solid tracer concentration with time at different radial and axial positions.Solids mixing has been described byaproposed two dimensional plug flow dispersion model satisfactorily. The radial and axial dis-persion coefficients at various operating conditions have been evaluted from the experimentalresults of tracer concentration versus time. Based on these results,correlations of the radialand axial Peclet numbers with bed voidage and gas Reynolds number were proposed.

气固超短接触反应系统中颗粒轴向及径向混合行为研究魏飞,陈卫,金涌,俞芷青(清华大学化工系,北京100084)关键词:气固超短接触反应器,磷光示踪,颗粒混合1前言气-固并流下行循环流化床反应器是一种新型气固超短接触反应器 ̄[1],与传统的提升管反应器相...

Comparing to the upflow riser reactors, cocurrent gas-solid downflow fluidized bed (downer)reactors have several distinct advantages given their short residence time, more uniform gas-solid flow and reduced backmixing. This new type of short contact time reactors can potentially be used in such industrial processes as chemical, petroleum, petrochemical,energy and environmental processes. Downer reactor has also been considered as a new high efficiency reactor to substitute the riser reactor during the 21st century....

Comparing to the upflow riser reactors, cocurrent gas-solid downflow fluidized bed (downer)reactors have several distinct advantages given their short residence time, more uniform gas-solid flow and reduced backmixing. This new type of short contact time reactors can potentially be used in such industrial processes as chemical, petroleum, petrochemical,energy and environmental processes. Downer reactor has also been considered as a new high efficiency reactor to substitute the riser reactor during the 21st century. In recent years, the development of downer reactors has attracted the attention of more and more academic researchers and industrial practitioners. In order to enhance the research and development of this technique, a comprehensive review on the subjects is provided in this series of four papers on the following aspects: Ⅰ. Development and applications. Ⅱ. Hydrodynamics. Ⅲ. Gas and solid mixing.Ⅳ. Hydrodynamic modelling. The first paper summarizes the industrial developments achieved so far and the potential applications of downer reactors. In addition ,the general hardware of downer reactors are also discussed.

和上行提升管反应器相比,气固下行流化床(下行管)反应器由于具有气固停留时间短、气固径向分布均匀、返混小等显著优点,因而在化工、石油、石油化工、能源等许多领域具有潜在的应用前景,被誉为是21世纪取代提升管反应器的一种新型高效反应器。已受到国内外越来越多专家和工业界的关注和重视。为了有利于对这一技术的研究和应用,本文试图从以下几个方面较全面地介绍这一新型反应器:Ⅰ、气固下行流化床反应器的发展和应用Ⅱ、气固下行流化床反应器中气固两相流动规律Ⅲ、气固下行流化床反应器中气固混合的研究Ⅳ、气固下行流化床反应器中气固流动模型本讲座主要综述了超短接触下行管反应器的应用和发展以及下行管反应器的基本结构。

 
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