热水采暖系统的水力平衡改造

以中航自控所住宅小区热水采暖系统的水力平衡改造为例,论述了由于设计、施工等原因造成的热力管网水力失调问题,介绍了静态平衡阀在解决管网水力失调时的操作方式、理论依据和效果。     

基于UG的闸阀CAE

利用UG软件强大的CAD/CAE功能进行闸阀的建模、装配、关键部分的运动仿真及阀体的有限元分析,对阀体尺寸和结构进行优化。建模所得的实体模型直接用于运动仿真分析和有限元分析,缩短了设计所需的时间,减少了软件间的数据交换。闸阀从建模、装配到运动仿真,再到优化设计,将在同一个软件中进行,可以减少物理样机的制造、试验等过程,提高工作效率,缩短产品的设计周期。     

倒流防止器装置过流件结构与能量损耗分析

文章在论述止回阀构成的倒流防止器装置结构及工作原理基础上,分析各类止回阀流态与流阻关系,并根据各止回阀过流结构的流阻系数,进行能量损失分析与计算,提出单蝶板型倒流防止器装置具有显著的节能效果,是一种很好的止回阀倒流防止器装置过流部件。     

水泵底阀漏水问题的分析与措施

对水泵底阀漏水问题进行了分析,认为底阀更换多次仍漏水时应考虑水泵停转水倒流使底阀关闭的同时,会在上部形成真空区,造成阀门关不严而渐渐漏水;解决方法有两个,一是在止回阀和水泵之间安装一个通向空气的止回阀,二是酌情把水泵出口的止回阀去掉。     

Cost-effectiveness analysis of the SAPIEN 3 TAVI valve compared with surgery in intermediate-risk patients

Objective: Transcatheter aortic valve implantation (TAVI) has become the therapy of choice for treating severe aortic stenosis in patients at high-risk for surgery or where it is considered too risky to attempt. This uptake varies across geographies however, and its cost or value has frequently been cited as the reason for this. We sought to evaluate the potential cost and clinical impact of TAVI in intermediate risk patients from a French collective perspective.

Materials and methods: The analysis was performed using a novel Markov model with data derived from the PARTNER II randomized controlled trial for survival, clinical event rates, and quality-of-life. The simulated time horizon was 15?years, costs were from French sources and presented in 2016 Euros. Discounting of all outcomes was at 4% annually and the effect of uncertainty in model parameters was explored by deterministic and probabilistic sensitivity analysis (PSA).

Results: In comparison to surgery, TAVI resulted in improved clinical outcomes (life expectancy and quality-adjusted life expectancy) and lower costs over a lifetime time horizon. The base case results showed increases of 0.42?years and 0.41 QALYs with lifetime cost savings of €439 for TAVI compared to surgery. PSA results showed a >50% likelihood of cost-effectiveness at €0 willingness-to-pay and a 100% likelihood at ～€15,000.

Limitations: Clinically, survival projections are based on limited follow-up data and introduce uncertainty into the outcomes from the model. Economically, procedure costs are derived from a heterogeneous mix of patient risk groups, although this is much more likely to bias against TAVI and under-estimate overall cost savings.

Conclusions: In our analyses of intermediate risk patients, TAVI is associated with superior clinical outcomes compared to surgery and is cost saving. It could be expected that cost savings are conservative and likely to increase over time.     

超深井修井作业减载技术研究

超深井修井作业中,面临常规修井机载荷不足、钻具安全系数低、钻机修井作业费用高等难题,急需提出或采取一系列减载措施,以解决常规修井机负荷大等问题.首先开展国内外超深井修井现状的调研,分析和总结超深井修井作业的难点,提出两减一增的修井作业减载技术,对比钢钻具、钛合金钻具的极限下深,建立满足修井机修井作业的钛合金钻杆和铝合金钻杆钻具组合,并在此基础上,对井下液压增力器、钛合金钻杆和铝合金钻杆在超深井修井作业中优缺点进行归纳总结,最后开展钢钻具、钛合金、铝合金钻具在修井过程中的经济性评估.研究结果为超深井修井作业轻量化技术提供了理论依据.     

科威特北部油区钻井技术

简要介绍了科威特石油储量等基本情况、科威特北部油区的地质概况和中国石化钻井队在该区Raudhatain油田钻井作业中所采用的井身结构、钻具组合、钻井参数、钻头优选、钻井液以及井控技术方面的情况,通过这些内容可以了解到在科威特施工的井队需要具备的一些基本条件和施工中需要注意的一些问题。对国内石油钻井技术的发展也有一定的借鉴作用。     

水下降水关键技术的研究与应用

为了降低水体下土层中的水位或水压,拟采用一种非常规的水下降水技术,保证水下工程的安全。水下降水技术是一种全新的技术,和陆上降水相比,其技术环节更复杂、施工难度更大。通过对某工程在水下降水施工过程中的技术难点、可行性分析、设计计算、土层参数确定等环节的探索、研究,并采用止水套管技术、新型隔水材料、水下降水试验模型、套管稳定性分析等一系列创新技术,建立一套可行的水下降水技术方案,确保该工程安全、顺利完成。水下降水技术在该工程的应用为国内外首次,但水下降水施工难度大、费用高,还存在一定的技术风险,还有一些技术环节需要进一步探讨。     

城镇给水一户一表工程探讨

"一户一表"改造工程作为供水行业的重点和难点工程,关系着千家万户的切身利益。通过对河池市金城江给水一户一表工程的探讨,为实施城镇给水一户一表工程提供一些参考,进一步推动给水一户一表工作。     

丙烷压缩机非正常停机时入口分离器液位超高的分析和处理

主要介绍了丙烷制冷系统发生非正常停机时,经常造成丙烷压缩机入口分离器液位超高报警。为满足再次开机条件,必须对其液相进行排放。不仅造成我厂的能源损耗,而且直接影响收率和产量。通过改变操作方式和在丙烷压缩机防喘后增加单向阀的措施,从而改善了不利局面,达到了再开机前减少排放丙烷,起到了降耗增效的目的。