伺服电机泵是电静压伺服机构能源转换、传动和控制装置,对整机性能有决定性影响.提出了一种高转速小排量伺服电机泵设计方案,转速最高达20000 r/min,运用Ansoft、Pumplinx及AMEsim软件进行磁、流及综合性能仿真,分别获得伺服电机最大工况点仿真数据、不同转速下泵转子组件摩擦搅油损耗及最大工况点AMEsim系统仿真数据.搭建试验系统,完成不同工况下的性能测试,得出不同转速空载及15000 r/min下不同压力负载试验数据,并分析了影响性能的主要因素.结果表明:该种伺服电机泵能够较好地满足瞬时高过载等应用要求,对于高速及高压等高工况,摩擦和搅油损失及高速电机铁芯损耗是影响性能的主要因素,提出了结构优化和改进方向.

OBJECTIVE:To investigate and evaluate the efficacy of HeartCon left ventricular assist device (LVAD) in the treatment of adult patients with end-stage heart failure (ESHF).METHODS:A prospective and observational study was conducted. Patients with ESHF who underwent LVAD implantation in the department of cardiac surgery of Teda International Cardiovascular Hospital from September 2020 to August 2021 were selected. The left ventricular end-diastolic diameter (LVEDD), left ventricular ejection fraction (LVEF), New York Heart Association (NYHA) classification, N-terminal pro-B type natriuretic peptide (NT-proBNP), and six minute walk distance (6MWD) before operation and 90 days after operation were compared. The incidence of equipment failures and major adverse events within 90 days after operation were recorded.RESULTS:A total of 20 patients with ESHF were included, with 15 males and 5 females. Patients' age ranged from 20 to 67 years old, with an average of (50.2±13.6) years old. The range of body weight was 49.8-106.1 kg, with an average of (67.9±15.5) kg, and the body surface area (BSA) was from 1.49 to 2.32 m2, with an average of (17.6±0.22) m2. The operation process of all the patients were successful. The length of hospital stay ranged from 33 to 90 days, and the average was 56.0 (42.8, 75.0) days. Complications within 90 days after operation as follows, 2 cases with pericardial tamponade (10%), 1 case with cerebral hemorrhage (5%), 1 case with mediastinum infection (5%), 3 cases with acute renal injury (AKI, 15%), 5 cases with gastrointestinal bleeding (25%). There were no mechanical failure of LVAD and hemolysis events, right ventricular failure (RVF), cerebral infarction and death occurred. Compared with preoperative, the LVEDD significantly decreased (mm: 67.50±13.98 vs. 77.40±9.73), LVEF significantly increased (%: 34.80±9.76 vs. 22.70±5.62), NT-proBNP significantly decreased (ng/L: 2 028.65±1 752.05 vs. 4 796.45±4 355.40), 6MWD significantly increased (m: 385.20±144.12 vs. 85.81±63.50) at 90 days after operation, and the differences were statistically significant (all P < 0.05). 18 cases (90%) of the 20 patients reached NYHA classification I and 2 cases (10%) reached NYHA classification II, which were significantly improved compared with those before surgery (all patients' NYHA classification were IV before surgery).CONCLUSIONS:HeartCon LVAD can effectively improve the life quality of patients with ESHF, which has been proved safe and effective in clinical trials, but its long-term effects and complications need further observation and study.

针对炼化装置大型机组造价成本高、维修周期长且一般无备用机组,一旦发生故障将对炼化装置本身及上下游生产装置产生不可预估的经济损失和社会负面影响的问题,分析了炼化装置大型机组管理现状,从设备管理体系建立、监测诊断技术使用、机组运行环境把控3个方面,深入研究了炼化装置大型机组日常运行的管理思路和具体措施.

目前,由于夹具的限制,动态热机械分析仪难以对纤维样品进行测试.本文利用DMA 8000动态热机械分析仪对纤维材料进行分析,从夹持方式、预加张力、夹持距离、升温速率等方面对测试结果的影响因素进行了研究.试验结果表明,为了保证纤维样品夹持的稳定性、控制测试精度在2℃以内,需使用铝箔对纤维进行前处理,预加张力控制在0.25～0.45 cN/dtex,样品的夹持距离为10 mm,升温速率设置为2℃/min.

针对某炼厂预加氢反应炉炉管偏流导致生产时各炉管温差大问题进行分析.借助格里菲思流型图分析炉管内流体流型,查出具体原因,并根据现场情况对装置生产条件进行优化,减小炉管偏差温度.最后提出措施解决炉管偏差问题.措施实施后,炉管偏流程度得到控制,偏流发生频次由4个月延长至9个月.

介绍中国石化齐鲁分公司第二化肥厂240 t/h循环流化床锅炉用的滚筒筛的运行情况,针对该滚筒筛在运行过程中出现的问题,制定出了整改方案.方案实施后,该滚筒筛运转周期得以延长,确保了循环流化床锅炉的高负荷生产.

PreviousNext No AccessSEG Technical Program Expanded Abstracts 2020A method to prove the rationality of fault interpretation mode from tectonic stress fieldAuthors: Wei WangKui WuXiaobo HuangDongjia HouYu XiongWei WangCNOOC LtdSearch for more papers by this author, Kui WuCNOOC LtdSearch for more papers by this author, Xiaobo HuangCNOOC LtdSearch for more papers by this author, Dongjia HouCNOOC LtdSearch for more papers by this author, and Yu XiongCNOOC LtdSearch for more papers by this authorhttps://doi.org/10.1190/segam2020-3424712.1 SectionsAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InRedditEmail AbstractAt present, Bohai oilfield has entered the second time interpretation stage. It is an effective means to find new structural traps by changing the original extension fault interpretation mode into the new strike-slip fault mode especially in Bohai Bay section of Tanlu fault zone. How to prove that the new strike-slip fault mode is correct? In this paper, we try to consider it from the aspect of tectonic stress field: through the development and application of tectonic stress field numerical simulation technology based on fault mode, fracture orientation information (dip angle and dip azimuth) in well and formation stress in wellbore. We respectively simulate the tectonic stress field formed by the two interpretation models and predict the corresponding fracture distribution. Then analyze the two predicted fracture orientation information and the actual fracture orientation information in well to see that which match better, so this interpretation mode is reasonable and correct. This study takes the fault system second interpretation of MiaoXi area in Bohai Bay Basin as an example (Figure 1). The main faults under original extension fault interpretation mode and new strike-slip fault mode are modeled in depth domain respectively. Combined with actual fracture information in well and the stress parameters from drilling and logging data, the numerical simulation of tectonic stress field is carried out respectively. It is confirmed that the coincidence rate of predicted fracture orientation information under strike-slip fault mode is 85%, and that under extension fault mode is 65%. Therefore, the strike-slip fault interpretation mode is more reasonable in MiaoXi area. New discovered structural traps’ area is more than 20km2, Provide high quality structural traps for oil and gas exploration.Note: This paper was accepted into the Technical Program but was not presented at the 2020 SEG Annual Meeting.Keywords: interpretation, geomechanics, faults, fracture stimulation, tectonicsPermalink: https://doi.org/10.1190/segam2020-3424712.1FiguresReferencesRelatedDetails SEG Technical Program Expanded Abstracts 2020ISSN (print):1052-3812 ISSN (online):1949-4645Copyright: 2020 Pages: 3887 publication data© 2020 Published in electronic format with permission by the Society of Exploration GeophysicistsPublisher:Society of Exploration Geophysicists HistoryPublished Online: 30 Sep 2020 CITATION INFORMATION Wei Wang, Kui Wu, Xiaobo Huang, Dongjia Hou, and Yu Xiong, (2020), "A method to prove the rationality of fault interpretation mode from tectonic stress field," SEG Technical Program Expanded Abstracts : 1155-1159. https://doi.org/10.1190/segam2020-3424712.1 Plain-Language Summary Keywordsinterpretationgeomechanicsfaultsfracture stimulationtectonicsPDF DownloadLoading ...

介绍了综采工作面纯水液压系统在煤矿开采应用中的独特经济优势,分析研究了该技术在实际应用中存在的关键技术难题.通过采用新材料、特殊表面处理方法及新结构,成功解决了由纯水介质引起的系统元件腐蚀、磨损等关键性问题.综采工作面纯水液压系统从根本上解决了应用乳化液充当传递介质带来的环境友好性差、成本高等一系列问题,充分发挥了纯水的自然特性,节约了生产成本,提高了矿井水的综合利用率,为推动我国煤矿绿色、高效、健康发展提供了有力技术支撑.

前陆盆地构造演化复杂,不同时期的沉积充填模式和沉积相受多种因素的影响.以南美哥伦比亚亚里次盆地为例,通过分析区域构造演化历史,认为盆地的沉积模式受盆地构造发育阶段、盆山耦合关系、海陆转换、造山带位置和气候等条件的影响.在此基础上研究了区内主力储层的沉积特征和形成条件,从而为确定储层发育特征和油气勘探开发提供有力支持.

茫汉断陷为后期改造型断陷,构造演化复杂.采用构造—地层分析方法,通过对多条地震剖面的二维构造解译、构造恢复、断裂三维立体分析,揭示茫汉断陷的发育过程,分析断陷结构特征和断陷成因机制.研究表明,茫汉断陷为复式断陷,总体上具有两洼夹一隆的构造格局,发育走向斜坡和中央斜向背斜两类一级构造变换带;断陷成因复杂,具有幕式活动的特征,主要经历早白垩世断陷、早白垩世末—晚白垩世坳陷、晚白垩世末盆地反转3个时期,其中早白垩世断陷细分为两幕断陷、两次挤压反转等4个阶段.

For the problem of 4 in 1 continuous catalytic reforming furnace of 1.2 Mt/a CCR exhaust gas temperature is higher and high energy consumption of the device,the heating furnace is reformed,and the waste heat recovery system and the condensation water/air heat exchanger equipment are put up.The heating furnace thermal efficiency is improved,and the gas consumption and energy consumption of unit are reduced.The energy saving transformation of the device is connected with reality,creates considerable economic benefits,and could provide reference for energy conservation and emissions reduction of the similar equipment.

The intelligent thermo-regulated fiber is a new functional fiber. The phase change material which absorbs or releases heat is introduced into the interior of the fiber, therefore the fiber can regulate the temperature when changes. The preparation technology, research progress of domestic, foreign technology and application fields of the intelligent thermo-regulated fiber were reviewed in this paper. The temperature-adjusting mechanism, phase change materials used for fiber fabrics, performance evaluation and the prospection of intelligent thermo-regulated fiber were also introduced.

OBJECTIVE:To verify the function of magnetic and hydrodynamic suspension centrifugal ventricular assist device in a sheep model.METHODS:The device was implanted into left ventricular apex on beating hearts. The outflow graft of each device was anastomosed to descending aorta in 11 animals. Hematologic, biochemical and blood clotting tests before and after surgery were performed. The data of pump functions were collected continuously.RESULTS:Among them, there were death from ventricular fibrillation (n = 3), acute pulmonary edema (n = 1) and left ventricular thrombus and molar cardiac muscle (n = 5). One animal survived for 75 days and died from bacterial infection after pumping for 59 hours. During assistance for 120 days, the flow rate was 3.0-3.4 L/min. All hematologic and biochemical parameters were within normal ranges in one sheep. The walking sheep wore the controller and lithium battery with a blood pump. Neither mechanical wearing nor thrombus formation was observed for inflow and outflow conduits or pump interior.CONCLUSIONS:The magnetic and hydrodynamic suspension centrifugal ventricular assist device demonstrates excellent hemocompatibility and reliability. And there is a great prospect of clinical success.

The air cooler is the key device for the terminal cold transfer of the cooling system, its type, layout mode and operational parameters have an appreciable impact on the cooling effect of the system. This paper discussed the classification and choice criterion of the air coolers and analyzed the layout mode of the air coolers in the coal face and heading face;in the working face,the air cooler can be laid out at the intake end of the air intake gate,at the air inlet opening of the face,in the face and in the air return gate;in the heading face,the air coolers can be laid out in a 50m area,and in this case,the exhaust air duct of the cooler should be thermally insulated. The paper also described the processing procedure and computation method of the air flow when the air cooler was laid out in the roadway,analyzed the thermodynamics features of the air flow processed by the air cooler. Finally,the computation formula for the refrigerating capacity of the air cooler was given.

磁液悬浮式血泵属于第三代心室辅助装置,该文基于非定常三维N-S方程和k-ε湍流模型,应用计算流体力学(CFD)方法数值模拟血泵的流场,并根据流场分析结果对血泵进行优化设计,血泵样机试验证明措施有效,各项指标均达到要求,CFD仿真分析对于血泵的研制具有重要的指导意义。

This paper presents a new maglev and hydrodynamic suspended centrifugal blood pump, the basic structure and working principle of the product are introduced. The simulation analysis of the internal flow field of the blood pump based on Ansys CFX is carried out. Also the simulation results are verified by means of experiments, then the theoretical basis for the design and improvement of magnetic liquid suspension centrifugal blood pump is put forward. At present, the product has achieved great progress.

The 36-A Oil Field in Suizhong,Liaoning is a hundred million ton-sized oil-gas field in the Bohai offshore field. The Palaeogene oil reservoirs are mainly concentrated in the second member of the Dongying Formation. The present paper deals in detail with the microscopic features and controls of the hydrocarbon reservoirs in the study area. The favourable reservoirs are mainly organized in the lacustrine delta front subfacies in the second member of the Dongying Formation. The diagenesis,clay mineral content,temperature-pressure field and fluid filling as main controlling factors of the physical properties of the oil reservoirs are believed to be responsible for the devolopment of vast extensive distribution,tremendous vertical thickness,high porosity and high permeability favourable reservoirs.

针对东岭地区断陷层火石岭组地层分布争议,分析前人解释中可能存在的问题,结合古生物孢粉组合特征,岩性组合特征,区域构造演化特征、构造解释及与周遭断陷盆地类比等方法,建立东岭地区新的地质解释模型,认为火石岭组发育于裂陷早期规模较局限的断陷湖盆内,且伴随火山喷发,沙河子组沉积期裂陷进一步扩展,形成多个沙河子期断陷且彼此独立,为东岭地区断陷层油气勘探指出方向。

Given the phenomenon of more and more mines faced with hot water damage,the major damage is analyzed through the hot water to the mine safety production.There are three types of the underground construction hot water.The mine hot water in our country most belongs to the faulted structure type and the sedimentary rock artesian basin type.The heat exchange between hot water and tunnel air flow is complex.It includes not only the latent heat exchange but also the sensible heat exchange.The heat release of mine hot water includes two parts of constitutions.The heat release is calculated when draining off the hot water through the cover plate gutter way or the pipeline.The hot water management should utilize the comprehensive measures.The hot water level is reduced using the method of advance unwatering firstly.The supporting measures are used to manage the local areas hot water of the tunnel.

In order to restrain fluctuation,principle of pressure-control mechanism in the pump is expounded;effect factors of pressure in the pump are analyzed theoretically,and causes of low-frequency fluctuation of pressure are indicated.In assembly process of the pump,important technological factors are controlled to decrease fluctuation.Experimental results indicate that,pressure fluctuation is restrained effectively,and pump qualification rate is improved clearly.