页岩气测试平台积液原因及排液对策研究

在页岩气排液测试阶段,井口压力、温度较高,采出气中含有大量的饱和水,影响测试平台内工艺设备和采气管线的正常运行.基于此,对饱和水进行现场取样与测试分析,探究测试平台的积液原因.针对积液原因,提出了在波纹板分离器前安装间壁式换热器的方案,以降低波纹板分离器入口的气流温度和饱和水质量浓度,并采用Fluent软件对换热管内部...     

六方相/单斜相WO3“异相结”的可控合成及光催化性能

利用沉淀法合成了球形六方相氧化钨(h?WO₃),通过调控六方相向单斜相的相变,可控制备了六方/单斜WO₃(h/m?WO₃)“异相结”催化剂。采用X射线衍射(XRD)、扫描电镜(SEM)和比表面积(BET)等对WO₃催化剂的晶相结构及组成、粒子大小和比表面积进行了表征。光催化分解水产氧的实验结果表明,相较于纯六方相WO₃,具有合适晶相组成的h/m?WO₃展现了显著的光催化性能。结合六方相和单斜相的能带位置,表面光电压表征结果发现,h/m?WO₃“异相结”的形成显著促进了催化剂表面光生电子和空穴的高效分离,进而提高了催化剂的光催化活性。     

用气液色谱研究1,3—丙二醇体系的盐效应

用色谱法了不同温度下，低碳醇，水在含盐（乙酸钾、硫氰酸钾、硫氰酸钠）１，３－丙二醇中无限稀释活度系数，醇、水的相对挥发度及含盐溶剂的选择度。     

植酸盐为原料制备植酸的工艺研究

用稀植酸代替无机酸溶解菲丁，通过阳离子交换制得的稀植酸溶液（省略阴离子操作），经２％活性炭脱色及真空浓缩制备出浓度为７０％～９０％的商品植酸。     

深圳市抛石填海区物探方法研究

在深圳某抛石填海区,由于存在较厚的淤泥层,而且在淤泥层中大量的分布着大小不均的石块,在物探作业的时候,往往难以探测到淤泥下面的基岩面,本文基于以上情况,通过对几种常规的物探方法的对比,从理论到实践,从中找到了最优的勘探方法,为以后从事此类工程的物探工作者提供一些借鉴。     

用于频率综合的电荷泵锁相环电路设计

在阐述了锁相环频率综合的工作原理、分析和设计方法的基础上,结合环路稳定性和相位噪声两方面因素对锁相环电路进行了建模及分析。采用安捷伦公司的ADS软件对锁相环进行了系统设计及仿真,并采用Cadence公司的Spectre-RF系列软件进行了锁相环具体电路设计和仿真。采用该方案设计的锁相环输出频率范围18.15 23 GHz,相位噪声-90 dBc/Hz,锁定时间小于5μs。     

Fuzzy对称可实现矩阵容度的计算

本文讨论了 Fuzzy 对称可实现矩阵的容度问题。找出了可计算的一个下界估计,借助于文〔8〕和文〔9〕提出的Ⅱ型 Fuzzy 关系不定方程的求解,给出了计算容度和计算相应的一组实现矩阵的算法。     

立式螺旋搅拌磨在硅灰石微粉碎工艺中的应用研究

论文从满足产品粒度,有利于保护针状结构,可操作性好,指标稳定,流程简化等技术角度论证了立式螺旋搅拌磨用于微粉碎硅灰石矿粉的合理性。结合生产实际的产品方案,在系统试验的基础上给出了最佳工艺参数。并运用了现代测试手段,光透过粒度测定仪和电子显微镜对产品进行了粒度分布测定和形貌观察。验证了搅拌磨生产超微粉仍能保护其针状结构。还指出了这种磨机操作稳定,效果稳定,可开路生产满足产品粒度要求,无需配用分级设备。     

硅灰石球磨过程中晶体结构的变化

研究了湖北大冶硅灰石精矿粉经不同时间刚玉球干磨后,晶体结构的变化特点。初期以多型转变为主,后期以晶体结构破坏为主,晶格畸变效应贯穿变化的全过程。在球磨过程中晶粒的剥离方向并不总是平行于{100}解理方向而是变化的,变化的剥离方向平行于晶体结构中单四面体的某些边棱方向。     

The status of exploitation techniques of natural gas hydrate

Natural gas hydrate (NGH) has been widely considered as an alternative form of energy with huge potential, due to its tremendous reserves, cleanness and high energy density. Several countries involving Japan, Canada, India and China have launched national projects on the exploration and exploitation of gas hydrate resources. At the beginning of this century, an early trial production of hydrate resources was carried out in Mallik permafrost region, Canada. Japan has conducted the first field test from marine hydrates in 2013, followed by another trial in 2017. China also made its first trial production from marine hydrate sediments in 2017. Yet the low production efficiency, ice/hydrate regeneration, and sand problems are still commonly encountered; the worldwide progress is far before commercialization. Up to now, many gas production techniques have been proposed, and a few of them have been adopted in the field production tests. Nevertheless, hardly any method appears really promising; each of them shows limitations at certain conditions. Therefore, further efforts should be made on the economic efficiency as well as sustainability and environmental impacts. In this paper, the investigations on NGH exploitation techniques are comprehensively reviewed, involving depressurization, thermal stimulation, chemical inhibitor injection, CO₂–CH₄ exchange, their combinations, and some novel techniques. The behavior of each method and its further potential in the field test are discussed. The advantages and limitations of laboratory studies are also analyzed. The work could give some guidance in the future formulation of exploitation scheme and evaluation of gas production behavior from hydrate reservoirs.