活塞式压缩机级间冷却器冷却效率影响排气量问题探讨

以２Ｎ４５－１５６／３２０型氮氢气压缩机为例，计算出了级间水冷器冷却效率对排气量的影响程度，并列举了提高级间水冷器冷却效率的有效途径。     

关于活塞式压缩机排气量不足的故障分析

从理论和实践的结合上系统地分析了压缩机排气量不足的原因,并提出了排除故障的具体方法。     

提高CO_2压缩机排气量

在二段入口缓冲器前添加小型水冷器,进一步降低压缩机二段入口温度是提高压缩机排气量行之有效的方法之一。通过理论分析与计算,得到降低二段入口温度后排气量的理论增加值,并进行现场改造,验证了此效果。结果表明:温度由34℃降至24℃,排气量提升3%左右。此方法设备投入费用低,安装简便,经济效益可观。     

低压比大排气量涡旋压缩机的设计

根据实际工艺条件的要求,对低压比、大排量参数的涡旋压缩机进行设计计算,得出涡旋压缩机的结构参数,并进行试验验证,分析涡旋压缩机转速与排气量和压力差之间的关系。从试验测试结果可以看出,设计符合工艺的要求,可以满足实际需要。     

影响煤气压缩机排气量不足的原因分析及解决方案

为解决煤气压缩机排气量不足导致能耗增加、设备工作效率降低的问题,以B-2201A/B煤气压缩机为研究对象,从气阀、活塞环、支承环等部件影响排气量不足的原因展开研究,并针对性地提出解决方案;按照规范将解决方案在煤气压缩机上实施安装后,通过实践生产验证了方案对改善煤气压缩机排气量不足的效果。     

往复活塞式压缩机特性参数的确定

在压缩机选型设计过程中，根据工艺条件初步确定机组的基本特性参数，例如轴功率、排气量、容积效率等，是开展以后工作的基础．本文对往复活塞式压缩机的特性参数进行了较详细的理论研究，并给出了容积系数、排气量、排气温度、轴功率的估算方法和计算公式，对于用户进行压缩机选型设计具有一定的实际指导意义。     

吸、排气阀差异化设计提升往复压缩机排气量

阐述了吸、排气压力损失简便计算方法,通过研究往复压缩机气量发现:吸、排气阀有效通流面积越大,气流压力损失越小,排气量越大。当往复压缩机吸、排气阀有效通流面积设置相同时,吸气平均压力损失远大于排气平均压力损失,造成吸、排气平均相对压力损失和并非最小,因此提出吸、排气阀差异化设计的方法减小实际压比,使排气系数增大,提升排气量,推导出排气量最大时的吸、排气阀有效通流面积比。实际上,按最佳吸、排气阀有效通流面积比分配气阀有效通流面积时,实际压比最小,排气温度也最低,为压缩机设计提供理论参考依据,并提出增加排气量的措施。     

浅谈活塞式压缩机常见故障

从曲柄销轴瓦的偏磨、曲柄销轴颈的损坏、十字头销的处理、活塞杆尾部的连接、活塞及活塞杆的损坏、活塞杆跳动的异常处理6个方面简要介绍了往复活塞式压缩机的故障诊断及处置措施,对于往复活塞式压缩机的使用与维护有一定的借鉴意义.     

浅谈活塞式压缩机的节能操作

压缩机的排气量和压力,在机器运转过程中不是固定不变的,进出压缩机的气体压力,也不等于压缩机的设计值。压缩机在变工况下怎样操作才会节能?下面以我厂的4M12-123/32型氮气压缩机为例来进行讨论     

活塞式压缩机转速选择的探讨

文章通过理论计算来探讨活塞式压缩机转速对压缩机重量、外形尺寸、排气系数、惯性力、气阀、管道系统的影响,以及在选择转数时应注意的方面。     

Some factors affecting rancidity

Summary 1. Data are given showing the relative keeping properties of various shortenings and the crackers in which they are used. Evidence is presented to show that some anti-oxidants which are effective in prolonging the life of shortenings largely disappear during the mixing, fermentation and baking of crackers. A theory is proposed to explain the contradictory results on the relative stability of the various shortenings and crackers containing them. 2. Metals, particularly iron, are shown to have a powerful effect in promoting the rancidity of crackers. For comparative stability work on crackers, it is necessary to remove all sources of metallic contamination. 3. Determination of the stability of shortenings does not necessarily indicate the stability the shortening will show in crackers. To determine the latter, it is necessary to use the shortenings in crackers and test the stability of the crackers.     

影响玻璃性质的几种因素分析

1引言 所谓玻璃的性质,是指玻璃受外部作用后,所表现出的一系列变化或响应.如力学性质(强度、硬度、弹性模量等),电学性质(电阻率、介电常数等),热学性质(热膨胀系数、导热系数等),磁学性质(磁化率、反顺磁性等),光学性质(折射率、反射率、透光率等),玻璃密度等,这些统称为玻璃的物理性质.玻璃的耐化学侵蚀性,玻璃的发霉等现象,由于伴随着化学变化的产生,应该归属于玻璃的化学性质.微观上讲,玻璃的物理性质是玻璃受外部作用后,玻璃中的原子或电子所做出响应的集中统计性平均表现.因此受构成玻璃的原子种类、原子的排列方式、网络结构或化学键的形式的影响.这是影响玻璃性质的内部因素.玻璃的熔化、退火为影响玻璃性质的外部因素.     

活塞式压缩机气阀技术改造

针对活塞式压缩机气阀出现的问题 ,在其结构、材质、热处理等方面进行了改进 ,并取得了非常良好的运行效果。     

丁二烯气体螺杆式压缩机安装要点

从丁二烯压缩机的性能数据、结构特点及系统流程、机组的安装要点、需要讨论和改进的几个问题等四个方面探讨了丁二烯气体螺杆式压缩机安装要点,在安装中注意这些要点,可以保证压缩机高质量安装。     

Some factors affecting hydrogenation of milk fat

Hydrogenation of milk fat with palladium and nickel as catalysts was studied at various temperatures, pressures, and concentrations of catalyst. Samples were removed from the laboratory hydrogenator at intervals during the reaction, and changes in refractive index, iodine value, Wiley mp, and percentages of fatty acids andtrans-isomers were determined. Palladium was several times more active as a catalyst than nickel. Milk fat with an iodine value of 35 and mp of 34 C was hydrogenated with 0.05% palladium to an iodine value of 6 and a mp of 46 C in 30 min at 66 C and 53 psi of hydrogen. Kinetic data for each catalyst yielded two slopes, indicating that a change in reaction rate occurred.     

Some factors affecting sieving performance and efficiency

Sieving or screening has been the oldest yet most important unit operation for industrial separation of solid particles or as a laboratory method in size analysis. A stack of sieves with decreasing mesh size is usually used. Alternatively, particles can be sifted in a fine to coarse order by multiple sieving steps with each step using a single sieve. The latter is referred to as reverse sieve method. This study compared the two methods for sieving performance and efficiency using flours made from soft white and hard white wheat, hulless barley and medium grain rice. Additional factors, including milling method (impact vs. abrasive), flour moisture (7% vs. 11%), duration of sieving (60 vs. 120 min), and tapping (percussion during sieving), were also investigated. Mass frequency and protein content of oversize fractions were measured. Results show that all the variables and their interactions had significant effects on sieving performance and efficiency. Among them, tapping was most important, followed by sieving duration, sieving method, milling method, flour type, and flour moisture. When other conditions were equal, the reverse sieve method always gave improved sieving efficiency over the stacked sieve method. The observation can be attributed to the beneficial effect of oversized particles on reducing sieve blinding by near or sub-sieve sized particles. Furthermore, the reverse sieve method also expanded the difference in protein content among sieved fractions. Because of its practical significance, this so far unreported effect would bear further confirmation of other sieving and screening conditions.     

我公司氮氢气压缩机五、六段活塞环改造

我公司合成车间共有氮氢气压缩机6台,采用四列六级H型布置,即为卧式四列六级H型对称平衡往复式活塞压缩机。1－3段压缩半水煤气,4－6段压缩氮氢气,在I级吸入状态下其排气量为165m^3/min,型号为H22Ⅲ－165／320。     

压缩机活塞杆过早疲劳断裂及防范对策研究

结合多年来压缩机操作、施工及管理实践,分析研究了活塞式压缩机活塞杆损坏的主要形式—早期疲劳断裂(特征),以及产生原因和防范对策,并根据目前国内一些使用厂家的实际情况,提出几点有针对性的见解和建议。     

活塞式高压机管系振动原因及防治

针对合成氨系统的大型压缩机组管系振动问题,深入分析了原因后,采取在管道中加装节流孔板的措施,使管系振动得到了有效控制。     

Some factors affecting durability of sulphur-impregnated porous bodies

The effect of impregnation on long-term durability has been investigated by exposing 1.3-mm thick specimens of sulphur-impregnated, autoclaved, portland cement-silica mixtures, room-temperature-cured pastes and porous glass to various liquids including water.All impregnated bodies were permeable to vapours, and matrices with specific surface areas in excess of 20 m²/g and impregnated with sulphur were subject to high internally-generated local stresses when exposed to water and other vapours, leading to possible failure.