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。     

自散热无油润滑空气涡旋压缩机的研究

为了研究自散热无油润滑空气涡旋压缩机的性能,建立了其数学模型,并通过Matlab分析了实际气体在工作过程中的容积、气体力和温度随曲轴转角的变化规律。将模拟计算得到的排气量、轴功率和排气温度与在实验测试平台上的实验数据进行对比,结果表明:自散热无油润滑空气涡旋压缩机散热效果良好,能够达到预期效果。     

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。     

跨临界CO2空气源热泵系统运行性能研究

搭建一套跨临界CO₂空气源热泵系统,研究在不同压缩机运行频率以及排气压力下循环系统的热力性能,通过实验对比分析频率和排气压力对吸气压力、等熵效率、压缩机功耗、排气温度、CO₂质量流量、系统制热量以及制热性能系数COP的影响。结果表明：排气压力不变时,只有吸气压力随着频率的上升而下降,排气温度、CO₂质量流量、系统制热量和压缩机功耗都随之增加。系统COP随着排气压力的增加先上升再下降,随着压缩机频率升高,系统COP减小,最优排气压力升高,在最优排气压力下,系统的COP达到峰值。当压缩机运行频率为80 Hz,排气压力为8.4MPa时,此时最优等熵效率约为0.9,系统COP达到峰值为3.64。     

氢气压缩机三级活塞环改造

由于我厂现有的ＬＨＡ - 3/ 15 0氢气压缩机三级活塞环寿命短 ,不能满足生产要求 ,因而对其进行改造。1　ＬＨＡ - 3/ 150压缩机主要技术参数排气量 (吸入状态 )　　 3ｍ3 /ｍｉｎ ;一级吸气温度≤ 35℃ ;最大排气压力 (表 ) 15ＭＰａ ;压缩机数四级 ;转　速 36 0ｒ/ｍｉｎ ;活塞行程 2 0 0ｍｍ ;轴功率 43.5ｋＷ ;冷却水耗量 3ｔ/ｈ ;电动机型号ＹＢ 315 - 8;气缸直径　一级 30 0ｍｍ ;二级 15 5ｍｍ ;三级 92ｍｍ ;四级 45ｍｍ2　三级活塞结构分析三级活塞为组合型 ,分上下体 2个活塞体零件 ,分别串在活塞杆上与活塞环、活塞底环、活塞隔…     

活塞式压缩机运行状态分析及改进

海南富岛化工公司空分装置中采用的氮气压缩机是两级两缸双作用水冷式无基础活塞式压缩机。型号为VHN-13/15。有关性能参数：吸入压力100kPa,排出压力（表压）1.5MPa,排气量（吸入状态)13m∧3/min,冷却方式为水冷,一级排气压力0.33～0.35MPa,各级进气温度≤40℃。各级排气温度≤180℃。额定转速985r/min,额定功率108kW。工艺流程见图1。     

4M12—55／220CO2压缩机的技术改造

我厂共有三台4M12－55／220CO。压缩机（沈阳气体压缩机厂生产），于1985年安装投运。三台压缩机均为四列五级对称平衡型，主要技术性能如下；排气量55m'／min正级吸入压力1．01325X10'Pa（绝压）1级吸入温度＜35C4级排气压力＜8．5MPa最终排气压力22．IMPa（绝压）压缩机轴功率720kw电机功率1000kw行程320mm转速333r／min各级缸径必720、口400、＆240、由185、o75冷却水消耗量120rn'／h（进出水温差10℃）三台压缩机自1985年投用以来，我们对其不断地进行改造完善，并精心管理，加强维护保养，从未发生过设备事故。为尿素装置的安全、…     

氧气压缩机燃爆原因分析及修复情况

1情况简介我公司气体厂ZW-3.47/16.5型氧气压缩机为立式、三列五级无润滑活塞式压缩机,由电动机驱动。除机身外,压缩机主要部件还包括气缸、曲轴、连杆、十字头、活塞、填料函、上下密封函、冷却水盘管及各级冷却分离器等。压缩机进气压力0.01 MPa,排气压力16.27 MPa。氧气由储气囊进入压缩机,经各级压缩后送入充装站。     

往复压缩机常见故障原因及对策

在工业企业的往复式压缩机中往往会出现机器停止工作的现象。这种情况会影响生产线的安全施工环境,严重的会造成经济损失。因此对该现象的本质进行分析,研究了排气量不足、排气温度不正常、排气压力降低、响声异常和过热等常见的问题,同时依次提出建设性的修改方案,以此来提高机器的寿命和工作效率,为生产生活过程的安全性提供保障。     

金属隔膜压缩机工作原理及常见故障排除

简述了金属隔膜压缩机的工作原理以及常见故障，如排气压力低；排气量不足；排气压力过高；排气温度过高；油压不稳或油压达不到规定要求等，并提出相应的排除方法，为该类型设备的检修提供了依据。     

乙烯酮(双乙烯酮)下游产品废水的治理技术

乙烯酮(双乙烯酮)是十分重要的化工中间体,其下游产品较多。江苏某化工厂开发生产乙烯酮(双乙烯酮)下游产品三十多个,年生产规模三万多吨,是国内以乙烯酮(双乙烯酮)为中间体生产精细化学品的综合骨干企业。针对乙烯酮(双乙烯酮)下游产品废水特点,该厂结合企业实际,开展了产品优化,结构调整,清洁生产,资源循环利用,节水降耗等工作,从源头削减了污染物的生产。同时投资二千多万元新建预处理装置三套,6000m3/d废水生化处理装置一套,使全厂乙烯酮(双乙烯酮)下游产品的废水得到了有效的治理。     

几种乙炔加压设备性能的比较

阐述并比较了几种加压设备在乙炔加压清净过程中的性能和特点。     

三种煤样燃烧热的测定

本文通过三个厂家提供的三种煤样燃烧热的测定,由测定结果综合得出3号煤样燃烧最完全、燃烧热也最大,是三个煤样中最好的一种。     

Semi-empirical equation of state of metals. Equation of state of aluminum

A semi-empirical equation of state for metals is described. Its capabilities are demonstrated by the example of the equation of state for aluminum. New experimental data are presented on the location of the isentrope of aluminum for unloading from the state at p = 229.71 GPa on the shock adiabat to an aerogel (SiO₂) of density 0.08 g/cm³. __________ Translated from Fizika Goreniya i Vzryva, Vol. 44, No. 2, pp. 61–75, March–April, 2008.     

水泥水化热测定方法综述

水泥水化热是中、低热水泥和核电工程用水泥的一项关键的技术指标。全球范围内测定水泥水化热的方法有溶解法、直接法/半绝热法、等温传导量热法三种。本文总结了中、美、欧相关方法标准,对其测试原理、仪器设备、试验过程等方面进行了比对,并对其在领域的应用做了简单的概括。     

小议汽车涂装工艺设计对涂装成本的影响

论述了涂装工艺设计对涂装设备投资、涂装生产成本的影响。     

Measurement of the gradient of viscosity with composition of mixtures of non-ideal gases

A perturbation viscometer is a differential capillary viscometer that measures the logarithmic viscosity gradient of the viscosity-composition curve for gas mixtures. Measurements are made at different gas mixture compositions. Integration of the logarithmic viscosity gradients measured over the full composition range gives the mixture viscosity relative to the viscosity of one of the pure components of the gas mixture. This method is attractive because, for measurements of equal precision, integration of the gradients is potentially an order of magnitude more precise than measurement of the viscosities directly. It can also work at high and low temperatures and perhaps high pressures.The perturbation viscometer has been used to make measurements on ideal gas mixtures at ambient and elevated temperatures. The situation is more complicated when the gas mixtures are non-ideal. Extra effects due to density differences, molar volume change on mixing and differential thermal expansion may be measured in addition to the desired viscosity change producing systematic errors in the results. Thus, a more sophisticated apparatus is required. The standard perturbation viscometer has been modified to separate out the extra effects to permit measurement of the true change in viscosity. In addition, the theoretical operation of the modified apparatus has been revised to account for the design changes to permit calculation of the viscosity-composition profiles from the results.The apparatus has been tested using helium-HFC-125 mixtures and two new viscosity-composition profiles are presented for these mixtures at 23 and . Internal consistency tests have been used to confirm that the data produced are of high quality with an estimated uncertainty in the viscosity ratio data at of 0.9% and at of 1.5%.     

Calorimetric and Computational Study of Enthalpy of Formation of Diperoxide of Cyclohexanone

A thermochemical rather simple experimental technique is applied to determine the enthalpy of formation of Diperoxide of ciclohexanone. The study is complemented with suitable theoretical calculations at the semiempirical and ab initio levels. A particular satisfactory agreement between both ways is found for the ab initio calculation at the 6–311G basis This set level. Some possible extensions of the present procedure are pointed out.     

塔设备改造选型的分析

就当前扩产增容中塔设备设计和改造时板式塔和填料塔的选型问题加以分析。在评述目前国内常用的几种塔板和新型填料之后，着重介绍一种新型塔板（导向梯形浮阀塔板）和一种新型填料（波环填料——乾隆帕克）。     

Effect of degree of deacetylation of chitin on the properties of chitin crystallites

In the present article, chitin from crab shell was systematically deacetylated using a NaOH treatment with control of the reaction time. The degree of deacetylation, monitored using solid-state NMR, revealed that the reaction was pseudo-first order. Based on this, swollen and NaOH-saturated particles are proposed as the reaction system. The weight loss of the partially saponified and neutralized samples after HCl hydrolysis increased linearly with the degree of deacetylation. The crystallinity of the samples was found to increase after acid hydrolysis. According to conductimetric titration, the surface charge density of the crystallites, after acid hydrolysis, was found to increase with base treatment time. The effect of surface charge on the formation of a chiral nematic phase, due to the rodlike nature of the crystallites, was explored. These results show that because the contribution of charged particles to the ionic strength was significant the double layer compression was affected, especially since the surface charge density was close to the Manning limit. © 1997 John Wiley & Sons, Inc. J Appl Polym Sci 65:373–380, 1997