钻井液振动筛叠层筛网透筛率的研究

从理论上详细论述了钻井液振动筛叠层筛网对固相颗粒分离的影响 ,首次提出用透筛率的概念定量地描述这一影响 ,并进行了实例计算。研究表明 ,当上下层筛网随机叠加时对透筛率的影响有以下几种情况 :(1)当上下层筛网开孔尺寸相除的余数为零 ,任意组合叠层筛网的透筛率分别为某一常数 ;(2 )上层筛网目数一定时 ,下层筛网目数越大 ,则透筛率越小 ;(3)上下层筛网的目数相差越小 ,透筛率越小 ;(4 )任意目数的上下层筛网随机叠加后 ,其透筛率仅在一个小范围内变化 ,因此任一叠层筛网有其固有的透筛率属性。     

一种广义水驱特征曲线的建立

广义水驱特征曲线能描述综合含水储量采出程度呈多种不同的凸、S、凹曲线类型。根据油水两相渗流原理，从归一化的油水相对渗透率出发，建立起累积产油、累积产水与综合含水率的积分相关关系，进而建立了累积产油、累积产水与归一化的油水相对渗透率的关系。通过构建积分函数，利用公式形式类比，建立了更一般形式的广义水驱特征曲线。理论分析和实例计算表明，所建立的广义水驱特征曲线与实际数据线性相关性更强，结果更可靠。     

A NEW HEAT-TREATMENT PROCESS FOR 2014 ALUMINUM ALLOY AND ITS MECHANISM

The plan of heat-treatment process for 2014Al alloy is designed using orthogonal method, the heat-treatment experiments are made and the mechanical properties are tested according to the designed plan. The effect of solid solution temperature, ageing temperature, ageing time on microscopic mechanism of the mechanical properties of the 2014Al alloy is studied using microscope, transmission electron microscope. The best heat treatment process of the 2014Al alloy is developed. The experimental results indicate that the strength σ_b, yield stress σ_(0.2), percentage elongation δ of the alloy reach separately 490～500 MPa, 450～490 MPa, 10～12％ adopting the new heat treatment process. Compared with GB, the strength increases 20～30％, the percentage elongation increases 30～40％. The mechanism of the new heat-treatment process is also discussed.     

几种云南木材液体浸渍行为的研究

研究了几种云南木材在水和有机液体中的浸渍行为 ,探讨了浸渍液体的溶解度参数、木材种类和密度、助浸剂、浸渍时间和压力以及电子束辐射 (EBI)等因素对木材的液体浸渍行为的影响     

球窝型动态混合器结构和机理的研究

介绍研制的题示混合器结构及其混合机理。在分析球窝流场各节点速度分布的基础上,用加权平均总应变和分流混合度作为评定指标,对球窝型混合器的混合行为进行分析。通过对比实验证明球窝型混合器对于高粘流体具有良好的混合功效。     

Oil and fat hydrolysis with lipase fromAspergillus sp.

Hydrolysis of olive oil, soybean oil, mink fat, lard, palm oil, coconut oil, and a hydrogenated, hardened oil with lipase from anAspergillus sp. has been studied. The lipase had high specific activity (60,000 U/g) and did not show any positional specificity. The lipase proved to be a more effective catalyst than Lipolase fromA. oryzae, with an optimal activity at 37°C and pH 6.5–7.0. It was activated by Ca²⁺ but inactivated by organic solvents such as isopropanol and propanone. All substrates examined could be hydrolyzed to corresponding fatty acids with this enzyme at concentrations of 5–30 U/meq with yields of 90–99% in 2–24 h. The degree of hydrolysis was almost logarithmically linear with reaction time and occurred in two stages. The lipase was stable and could be repeatedly recycled for hydrolysis.     

Modeling industrial thickener using computational fluid dynamics (CFD), a case study: Tailing thickener in the Sarcheshmeh copper mine

Separation of particles from liquid in the large gravitational tanks is widely used in mining and industrial wastewater treatment process. Thickener is key unit in the operational processes of hydrometallurgy and is used to separate solid from liquid. In this study, population balance models were combined with computational fluid dynamics (CFD) for modeling the tailing thickener. Parameters such as feed flow rate, flocculant dosage, inlet solid percent and feedwell were investigated. CFD was used to simulate the industrial tailing thickener with settled bed of 120 m diameter which is located in the Sarcheshmeh copper mine. Important factor of drag force that defines the rake torque of rotating paddles on the bed was also determined. Two phases turbulence model of Eulerian/Eulerian in accordance with turbulence model of k-ε was used in the steady-state. Also population balance model consists of 15 groups of particle sizes with Luo and Lehr kernel was used for aggregation/breakage kernel. The simulation results showed good agreement with the operational data.     

基于逾渗理论的CaO吸收CO2动力学模型研究

石灰石循环吸收技术被认为是一种高效、经济的减排烟气中CO2技术。但这种方法循环效率降低较快,吸收剂利用率也较低。为了对这一过程有很好的认识,改善吸收剂的利用率,针对颗粒典型气固反应模型的缺点,将逾渗理论应用于CaO与CO2反应模型中,对CaO颗粒吸收烟气中CO2的过程进行描述。实验数据与模型数据相结合,表明新的模型可以很好地对吸收过程进行描述,并得出:烟气中CO2体积分数对CaO转化率的影响主要是在反应初期的化学反应阶段;小粒径CaO颗粒在一定程度上可以提高CaO的钙转化率。这为实际过程提高循环吸收效率提供理论指导。     

长寿命产品退化筛选试验方法研究

 传统的可靠性筛选方法以产品是否失效为筛选判据,对于高可靠长寿命产品,必须将产品长时间置于筛选应力下,对于一批产品中的合格品会产生较为严重的不良影响.针对退化失效型产品,研究了不合格品与合格品的性能退化规律:在筛选应力下,相对于合格品,不合格品性能参数的变化速率相对较快,从而使得性能参数在试验检测过程中形成明显的双峰分布.论文提出了基于产品性能退化特性的可靠性筛选技术,在保证筛选成品率和产品可靠度的前提下,通过合理选取筛选试验持续时间和筛选阈值,实现了缩短试验时间和减少筛选应力对合格品的不良影响的目的,最后通过实例说明了方法的有效性.     

多功能食品脱油系统

通过广泛调研油炸食品的制作过程,以降低食品含油率为目标,在传统的食品脱油系统基础上,设计出一套集脱油、风冷、输送为一体的多功能食品脱油系统。该食品脱油系统与传统脱油系统相比,其脱油效果明显,占地面积小,市场潜力大。另外,本研究工作还利用三维实体造型软件Pro/E建立该脱油系统的三维实体模型。