首页 > TAG信息列表 > gas
全部论文
电力论文   |   建筑论文  |  机械论文  |  化工论文  |  石油论文  |  冶金论文  |  矿产论文  |  材料论文  |  电子论文  |  航空航天论文  |  通信论文  |  计算机论文  |  水利论文  |  地质论文  |  铁道论文  |  汽车论文  |  管理论文  |  农业论文  |  食品论文  |  医学论文  |  海洋论文  |  船舶论文
  • Comparison and application of different empirical correlations for estimating the hydrate safety mar

    As the oil and gas industries continue to increase their activity in deep water, gas hydrate hazards will become more serious and challenging, both at present and in the future.Accurate predictions of the hydrate-free zone and the suitable addition of salts and/or alcohols in preparing drilling fluids are particularly important both in preventing hydrate problems and decreasing the cost of drilling operations.In this paper, we compared several empirical correlations commonly used to estimate the hydrate inhibition effect of aqueous organic and electrolyte solutions using experiments with ethylene glycol (EG) as a hydrate inhibitor.The results show that the Najibi et al.correlation (for single and mixed thermodynamic inhibitors) and the Ostergaard et al.empirical correlation (for single thermodynamic inhibitors) are suitable for estimating the hydrate safety margin of oil-based drilling fluids (OBDFs) in the presence of thermodynamic hydrate inhibitors.According to the two correlations, the OBDE composed of 1.6 L vaporizing oil, 2% emulsifying agent, 1% organobentonite, 0.5% SP-1, 1% LP-1, 10% water and 40% EG, can be safely used at a water depth of up to 1900 m.However, for more accurate predictions for drilling fluids, the effects of the solid phase, especially bentonite, on hydrate inhibition need to be considered and included in the application of these two empirical correlations....

    2020-12-22 21:24:13浏览:108 oil-baseddrillingfluidgashydratesethyleneglycolinhibitionprediction

    查看
  • 添加剂对烟气脱硫的强化作用

    采用鼓泡式烟气脱硫反应装置,研究了己二酸、硫酸镁、无机盐A和无机盐B等4种添加剂的脱硫强化作用.实验结果表明:4种添加剂均能较明显地提高脱硫浆液的脱硫率,且添加无机盐A和无机盐B的脱硫效果更好;随着添加剂加入量的增加,脱硫率逐渐提高,综合考虑,本实验适宜的添加剂加入量为1.0 g/L.现场实际应用中加入质量比为1∶1的无机盐A和无机盐B作为复合添加剂,在使用2台循环泵、烟气流量约1 020 km3/h、初始SO2质量浓度由2 981 mg/Nm3增加至约3 843 mg/Nm3的条件下,脱硫率仍由81.79%提高到89.92%....

    2020-12-09 22:57:44浏览:45 烟气脱硫石灰石-石膏法添加剂脱硫率废气处理fluegasdesulfurizationlimestone-gypsumprocess

    查看
  • 添加剂对聚砜膜气体分离性能和结构的影响

    以聚砜为膜材料,通过浸入沉淀相转化法制备聚砜平板膜.溶剂为N,N-二甲基乙酰胺,凝胶介质为水.以有机小分子无水乙醇、正戊醇、丙酮、磷酸三丁酯,有机大分子聚乙二醇(PEG-400,PEG-2000)和无机小分子无水氯化锂为添加剂来调节膜结构,通过渗透性、选择性和电镜图(SEM)来评价添加剂对膜性能、结构的影响,选择工业上适用于气体分离的添加剂.结果表明,聚乙二醇有较高的渗透性和选择性,其次为磷酸三丁酯,但由于聚乙二醇价格昂贵,所以选择磷酸三丁酯为较优添加剂....

    2020-12-06 21:11:24浏览:70 聚砜气体分离添加剂选择性渗透速率polysulfonegasseparationadditiveselectivitypermeation

    查看
  • Comparison and Analysis of Fabric Deodorization Test Methods

    The test methods of deodorization fabric are studied in daily life.In view of different deodorization fabrics and source gases,the detector tube method and gas chromatography-flame ionization detector (GC-FID) method were chosen to test the deodorizing rates of fabric and the influencing factors on deodorization test were discussed.Through the two methods,the residual concentration of odorous substance after adsorption can be measured,and the deodorizing rates of deodorization fabric can be got by calculation.The results show that the two test methods are both appropriate for deodorization test of fabric....

    2020-12-06 21:11:24浏览:76 deodorizationfabricdeodorizingratedetectortubegaschromatography-flame

    查看
  • A New Grade Carbon Black Produced by Thermal Plasma Process

    This paper presents a new route about producing carbon black, by which the naturalgas cracking is carried out in the absence of oxygen thanks to an electric energy supply externallygiven by a plasma jet. The carbon black produced by this process has a narrow size distributionand a small average diameter of 38 nm as well as a highly branched aggregate. The higher DBPvalue of 1.40 ml/g shows it should be a high structure carbon black. The FTIR spectra shows thatthere are lots of aromatic c-c bonds and a large amount of nitrogen-containing functional groupson the carbon blacks surface, such as -NH, -CN as well as -CH, -OH, -COOH groups....

    2020-11-11 22:33:38浏览:84 carbonblackthermalplasmanaturalgas

    查看
  • Comparisons between different models for thermal simulation of GTAW process

    Two mathematical models are built to study the effects of the fluid flow on thermal distributions of the gas tungsten arc welding(GTAW) process. One model is based on the heat conductivity equation, which doesn' t take the effects of the fluid flow into account, and the other couples the laminar heat transfer and fluid flow in the weld pool, which is called laminar fluid flow model in short. The simulated results of the two models show that the pattern and velocity of the fluid flow play a critical role in determining the thermal distribution and the weld pool shape. For the laminar fluid flow model, its highest temperature is 400 K lower than that calculated with the other model and the depth of its weld pool is shallower too, which is mainly caused by the main vortex of the flow in the weld pool....

    2020-11-11 22:33:38浏览:62 thermaldistributiongastungstenarcweldingheattransferandfluidflow

    查看
  • Geochemical characteristics and formation process of natural gas in Kela 2 gas field

    On the basis of a large amount of natural gas components and the carbon isotope as well as some other analysis data in Kela 2 gas field, the geochemical characteristics, source, origin, and formation process of natural gas have been discussed. The components of gas in the field tend to be "dry", and the drying coefficient is close to 1.0. The carbon isotope tends to be heavier, for instance, the average of 13C1 is 27.36‰ and that of 13C2 is 18.5‰. Comprehensive analysis shows that humic natural gas in the Kuqa petroleum system comes mainly from Triassic and Jurassic source rocks, and the contribution of Jurassic source rocks to the pool maybe is more than that of Triassic rocks. The main cause that the gas tends to be dry and bears heavier isotope composition lies in the fact that Kela 2 natural gas is the accumulation of late production of humic source rocks, and it is affected by the abnormal high pressure as well. Considering the hydrocarbon generating and structural history, we can regard the gas pool formation processes as twice filling and twice adjusting (destroying), that is, the filling and destroying process in the early Himalayan movement and the filling and adjusting in the late Himalayan movement....

    2020-11-11 22:33:38浏览:72 naturalgasGeochemistrysourceofreservoirformationprocessKela

    查看
  • Purification technology of flue gas from remelting process of aluminum alloy tailings

    Through a practical example of treatment of the flue gas from the remelting process of aluminum alloy tailings, the design and calculation method of exhaust hood, as well as the principles and the equipments of dust removal, smoke abatement and harmful gas elimination were studied. Combination of centrifugal and wet dust removal can purify the dust high efficiently. The carbon black and harmful gases in the flue gas can be removed by adding a small quantity of activator to the absorption solution. The application results are that the dedusting efficiency is 97.43%, Cl2 control efficiency is 88.03%, the exhaust fume blackness is lower than Ringelman number I, and the purification device resistance is 1126Pa....

    2020-11-11 22:33:38浏览:67 aluminumalloytailingsfluegaspurification

    查看
  • Evaluation of Process Capability in Gas Carburizing Process to Achieve Quality through Limit Design

    Steel is the most important metallic material used in industry. This is because of the versatility of its engineering properties under different conditions. In one condition it can be very mild, soft and suitable for any forming operation. In another condition the same steel can be very hard and strong. This versatility is made possible by the different heat treatments that the steel can be subject to. One such treatment is Gas carburizing. This is the most widely used process for surface hardening of low carbon steels. In this method the surface composition of the steel changes by diffusion of carbon and or nitrogen and result in hard outer surface with good wear resistance properties. A striking feature of Gas Carburizing process is that in this process the original toughness and ductility remains unaffected even after heat treatment. 3% nickel chromium case hardened low carbon steels are widely used for critical automotive and machine applications such as rack and pinion, gears, camshaft, valve rocker shafts and axles which requires high fatigue resistance. Fatigue behaviour of case carburized parts depends to a great extent on the correct combination of Hardness Penetration Depth (HPD) and the magnitude of hardness at the surface and beneath the surface with low size and shape distortion. In order to reduce the manufacturing costs in terms of material consumption and elimination of the number of processing steps, the effect of Gas carburizing parameters on the fatigue behaviour should already be considered in the parameter design stage. Therefore it is of importance to optimize the gas carburizing process variables to attain quality products with respect to hardness and case depth. In the present paper, the evaluation of process capability was carried out through a Limit Design Concept called orthogonal array design of experiment. To optimize the process variables the influence of several parameters (Holding time,Carbon potential, Furnace temperature and Quench time) of the gas carburizing process on the micro hardness, total case depth, effective case depth and level of distortion of AISI 8620 steel were discussed....

    2020-11-11 22:33:38浏览:79 gascarburizingoptimizationcarbonpotentialholdingtimequenching

    查看
  • Nox reduction in the sintering process

    A new process, NOx reduction with recycling flue gas and modifying coke breeze, was proposed. The effects of modified coke breeze and recycled flue gas on NOx reduction were investigated by sinter pot tests. The results show that the NOx reduction rate is over 10wt% in the sintering of modified coke breeze, the effects of the additives on NOx reduction are: CeO2CaOK2CO3.The NOx reduction rate increases with the amount of recycled flue gas, and is 22.35wt% in the sintering with recycling 30vo1% of the flue gas. When 30vo1% of the flue gas is recycled into the sintering of CeO2, CaO, and K2CO3 modified coke breeze, the NOx reduc-tion rates are 36.10wt%, 32.56wt%, and 32.17wt%, respectively....

    2020-11-10 09:33:08浏览:44 nitrogenoxidefluegascokebreezeceriumsintering

    查看
  • Microstructure evolution of A1-Si semi-solid slurry by gas bubble stirring method

    A novel technique of introducing gas bubble stirring during solidification was studied to prepare Al-Si semi-solid slurry.The microstructure evolution of the slurry during slow cooling process after stirring was investigated.The effects of the solidification rate on the microstructure of the semi-solid slurry were investigated under three different solidification conditions.The results show that fine non-dendritic slurry can be obtained using the gas bubble stirring method.Ripening and coarsening of primary Al grains are observed during the slow cooling process,and at last coarsened eutectic Si appears.Primary Al grains with different sizes and eutectic Si are obtained,corresponding to three different solidification rates....

    2020-11-03 10:30:25浏览:65 gasbubblestirringsemi-solidslurrySolidificationratemicrostructure

    查看
  • Flow Characteristics in an External-Loop Airlift Slurry Reactor

    The local flow characteristics in an external-loop airlift slurry reactor were investigated.The axial profiles of the local gas holdup,the Sauter mean diameter and the rise velocity were obtained.It was found that the bubble size and rise velocity were influenced by the solid holdup,and the bubble coalescence was enhanced by the increase of the solid holdup.A new correlation was used to predict the slip velocity between the gas phase and the slurry phase by taking into account the local gas holdup,the bubble size,and the physical properties of the experimental system.By using this correlation,the local drag coefficient can be calculated in the bubble swarm....

    2020-11-03 10:30:25浏览:49 slurryreactorbubblegasholdupslipvelocitydragcoefficient

    查看
  • Porous Cube-like In2O3 Nanoparticles and Their Sensing Characteristics toward Ethanol

    Porous cube-like crystalline In2O3 nanoparticles with an average diagonal length of 34.8 nm were fabricated by a laser ablation-reflux process to form In(OH)3, followed by a calcination treatment to yield porous In2O3. HRTEM (high-resolution transmission electronic microscopy), XRD (X-ray diffraction), BET (Brunauer-Emmett-Teller), and XPS (X-ray photoelectron spectroscopy) analysis were used to characterize their crystalline structures, grain sizes, surface areas, and surface compositions. The as-prepared porous indium oxides were tested for their sensing properties toward ethanol. Non-porous In2O3 nanopowder (about 40 nm) was also examined in order to compare the results with the as-prepared porous In2O3 nanomaterials. The porous In2O3 exhibited much better performance than that of non-porosus In2O3, and showed enhanced sensitivity with a lower detection limit than other reported In2O3-based materials when exposed to ethanol. Good gas sensitivity and linear behavior as a function of ethanol concentration were observed in the porous In2O3 nanoparticles....

    2020-10-22 17:35:41浏览:54 In2O3porosityNanoparticlesgasSensor

    查看
  • Preparation and Ethanol Sensing Properties of ZnO Nanofibers

    ZnO nanofibers with an average diameter of about 90 nm were prepared by an electrospinning method combined with a calcination process.The as-electrospun nanofibers before and after calcination were characterized by means of differential thermal analysis(DTA),thermal gravimetric analysis(TGA),X-ray diffraction(XRD) and scanning electron microscopy(SEM).The fibers after calcination at 600 ℃ belong to the hexagonal wurtzite structure.The sensor based on ZnO nanofibers exhibited excellent ethanol sensing properties at 206 ℃ such as good linear dependence in the low concentration(1-100 μL/L),high response,and good selectivity.Fast response(less than 2 s)and recovery(about 16 s) were also observed in our investigations....

    2020-10-22 17:35:41浏览:64 ElectrospinningmethodZnOnanofiberethanolgasSensor

    查看
  • 焦炉煤气非催化部分氧化制合成气实验研究与数值模拟

    在带有单孔喷嘴石英管反应器实验的基础上,对焦炉煤气非催化部分氧化工艺制合成气进行了研究,分析了O_2/GAS比对合成气各组分含量的影响,反应器中反应过程和温度分布及出口产品组成.实验结果表明CH4转化率随O_2/GAS比增大而增大,O_2/GAS比调节到0.22~0.26时,CH_4转化率达到95%~97%,此时合成气CH_4含量低于1%.利用CFD软件平台对转化反应器进行了数值模拟.模拟结果显示,流量一定时出口气体组分H_2与CH4分别随着进气氧气与焦炉煤气体积流量比值的增加而减少.CO和CO_2分别随着比值的增加而增加.出口气体有效组分摩尔分数随进气流量的变化不是非常明显.在壁面温度为1 100 K时转化效果最好....

    2020-10-02 20:35:09浏览:44 焦炉煤气计算流体力学数值模拟反应器流场cokeovengascomputationhydromechanicsnumerical

    查看

能化大数据平台 ©2010-2022 All Rights Reserved.  
沪ICP备14007155号-3 网站地图 化工热词旧版本
关于我们| 会员说明| 广告合作| 联系我们| 免责声明| 投稿须知|

能化大数据平台二维码
在线客服
服务邮箱

服务邮箱

cnmhg168@163.com

微信咨询
微信
返回顶部
X我的网站名称

截屏,微信识别二维码

微信号:anquanhun

(点击微信号复制,添加好友)

  打开微信

微信号已复制,请打开微信添加咨询详情!