夏热冬冷地区冷却塔—土壤耦合热泵过渡季蓄冷特性研究

本文针对夏热冬冷地区冷热负荷特性,提出了冷却塔—土壤耦合热泵过渡季土壤蓄冷模式,采用软件TRNSYS建立了冷却塔—土壤耦合热泵过渡季土壤蓄冷系统仿真模型,并利用该模型针对过渡季土壤蓄冷的两个主要影响因素进行了工况模拟分析,,在此基础上提出了冷却塔—土壤耦合热泵过渡季节土壤蓄冷的控制策略.本文力图通过上述研究探索出缓解夏热冬冷地区土壤源热泵系统全年热失衡问题、提高该系统运行效率的有效途径.     

水泥胶砂强度检测结果准确性的影响因素

水泥胶砂强度是水泥物理性能中最重要的参数,该参数在检测过程中的步骤较多,诸多的影响因素都将导致最终的检测结果出现偏差。本文主要探讨水泥胶砂强度检测结果的影响因素。提出了弱化这些影响因素的若干措施,从而确保检测结果的准确性。     

无源滤波器无功补偿容量分配及支路投切顺序生成

为解决用于矿井无功补偿和谐波抑制的无源滤波器设计及控制问题,兼顾矿井负荷运行特性和谐波源电流进行无源滤波支路初始无功补偿容量分配,考虑到煤矿负荷因其生产特点而呈阶梯性变化,提出一种计算滤波支路负载率的方法,并应用禁忌搜索算法进行无源滤波器参数优化设计。以补偿容量满足系统功率因数要求及开关操作成本最小为目标,操作过程中不产生谐波放大、功率因数不超出合格范围为原则,建议了一种滤波器运行方式切换操作顺序自动生成方法。最后应用一个实际工程算例进行分析和说明,结果表明本文提出的方法具有良好的可行性。     

浅谈海洋风电勘察安全风险控制

海洋风电勘察不同于陆地,钻探要依靠水上平台,为了确保海洋勘察施工的安全,应考虑各种危险有害因素,及有效评估安全风险,再通过编制一系列的安全措施予以防范,以确保海洋勘察施工的需要。     

大型风扇磨煤机磨制高水分褐煤运行特性研究

对我国自主研制的MFH3610型风扇磨煤机在磨制高水分褐煤时的纯空气通风特性、出力特性和干燥特性等主要运行参数进行研究,以掌握风扇磨煤机褐煤制粉技术的优势,为推动褐煤的清洁、高效利用起到促进作用。     

跳汰机控制系统的升级改造

由于原有的跳汰机控制系统结构复杂、功能简单,故在不改变跳汰机体结构前提下对其控制系统进行升级改造。改造后的控制柜采用PLC做主机,采用触摸屏人机接口进行可视化操作。     

电网变电运维检修技术研究

介绍了目前国网电力系统的维护管理方法以及利用SCADA数据提高设备维护效率的方法。国网电力系统在SCADA数据的标准化建设方面投入了大量精力,使用SCADA数据进行分析,推动了电力标准化的需求。对电气开关设备、变压器寿命、运行中的设备和分接开关的运行进行了分析。分析了断路器和隔离开关在不同运行条件下的开关操作次数。据此得出,电气预防性维护应根据正常操作中的开关次数进行,对经常中断故障电流的断路器进行预防性维护。SCADA数据可用于设备的监测,从而为管理人员提供有价值的信息,并对电气设施的检修管理进行了分析。     

采煤机截割部双电机运行状态分析与研究

通过对截割部双电机的稳态和动态两种运行状态的分析,给出了截割部双电机稳态运行的机械特性和双电机稳态运行的条件。并得出双电机动态运行时转速、转矩、电流对时间的动态特性。     

Pascal程序设计中的技巧

详细叙述了位操作的使用方法,并通过进制转换问题作为实例,阐明了位操作的特点:高效性和简易性。针对使用哈希表过于浪费空间的问题,提出了一个有效的利用被浪费的空间方法,并通过位操作对其算法进行了优化,使得算法快捷、简单、高效。     

Scale-up in the 4th dimension in the field of granulation and drying or how to avoid classical scale-up

In the pharmaceutical industry, the production of granules is based on a batch concept. This concept offers many advantages, as a batch can be accepted or rejected. However, the scale-up of the batch size may lead to problems. The variety of the equipment involved does not facilitate the scale-up process and the capital invested in space and equipment is high. An alternative approach is the use of a continuous process. However, continuous processes have the disadvantage among others that the batch size is not well defined. Thus, a special quasi-continuous production concept was developed, taking into account the advantages of a batch type and a continuous process. This concept was developed in cooperation with the Institute of Pharmaceutical Technology of the University of Basel, Glatt CH-4133 Pratteln and F. Hoffmann-La Roche, CH-4070 Basel. The equipment allows to implement a “Just in Time Production Concept” as a large batch B consists of n subunit (SU) batches b, i.e. B=nb. The subunit batch b corresponds to, e.g. 7-kg material for the production of pharmaceutical granules for further processing such as tabletting. At the Roche production site, this novel process equipment was used to manufacture batch sizes B with n=10, n=100 and so far up to n=600 subunits. This leads to an optimal use of capital invested in GMP space and equipment. The difference to the classical scale-up is the following: with classical scale-up, the dimensions of the equipment x, y, z is enlarged and the process time is more or less kept constant. With this novel concept, the dimension x, y, z of the equipment is kept constant and the process is repeated in the 4th dimension “n times”. Thus, for the scale-up in the 4th dimension, i.e. in the time, the equipment needs to show a “self-cleaning” property and appropriate formulations. The novel concept is of special interest, as the quality of the product is not changed during scale-up.