RIK90-4型空压机停机过程中喘振的原因分析

25000 m3/h空分设备配套的RIK90-4型空压机,由于放空阀及其管道的安装标高不合理,导致叶轮清洗水长期积聚在管道内,使放空阀的阀板与阀体生锈卡死,从而使空压机停机过程中的排气压力和排气量不匹配而发生喘振。简介喘振现象和经过,介绍原因分析过程,最后提出预防放空阀及其管道积水进而使放空阀卡死的措施。     

空压机冷却器冷却效果差引起排气压力超标的分析

由于活塞式空压机二级冷却器冷却效果不佳,二级排气压力超过设计压力,造成安全阀起跳。更换二级冷却器,解决了此故障。介绍了保证活塞式空压机冷却器冷却效果的操作方法。     

空压机冷却器冷却效果差引起排气压力超标的分析

由于活塞式空压机二级冷却器冷却效果不佳，二级排气压力超过设计压力，造成安全阀起跳。更换二级冷却器，解决了此故障。介绍了保证活塞式空压机冷却器冷却效果的操作方法。     

空压机气侧阻力和进气温度对性能的影响分析

分析了空压机气侧阻力、进气温度以及进气导叶开度等对空压机各级压缩比的影响规律,估算了气侧阻力和进气温度变化对空压机功率的影响,指出中间冷却器气侧阻力增大有可能引起空压机性能严重下降,分析了气侧阻力和各级进气温度等对空压机流量及喘振点的影响。     

铝电解多功能机组ML55-V型空压机的工作原理及常见故障

介绍了空压机的工作原理,包括进气系统、压缩机组件、油气分离器、后冷却器和带冷却器的压力润滑系统。对空压机在运行过程中的排气温度高造成空压机停机等5个常见故障进行了分析,并针对其故障的原因给出了处理办法。     

RR150-4型空压机喘振现象的分析及处理

因为空压机进口自洁式过滤器过滤效果差,灰尘进入空压机,导致进口导叶和一级叶轮积垢以及中间冷却器堵塞,使空压机发生喘振。介绍进口导叶、一级叶轮和中间冷却器的清洗过程以及清洗效果,最后总结防止空压机喘振的措施。     

30000m~3/h空分设备空压机漏油故障处理

30000m3/h空分设备配套EIZ100-4型空压机运行中出现油箱油位大幅度下降现象,在无法确定油是否泄漏到气侧和水侧的情况下,果断停车检修。通过检查低压端轴承箱、级间冷却器、油冷却器等可能出现内漏的环节,找准原因,采取适当的措施预以消除。简介空压机漏油现象,详细分析漏油故障的诊断过程和原因。     

空压机采用铝板翅式冷却器及其清洗工艺

介绍DA350-61型空压机原管式冷却器改用铝制板翅式冷却器,使空压机排气量提高15%,电耗降低10%。文章列述了改用铝板翅式冷却器的措施,及其采用固体酸化学清洗剂清洗的效果。表2。     

空压机叶轮喷水冲洗系统的应用

以邯钢动力厂的VK50-3型空压机为例,介绍了叶轮喷水冲洗系统的工作原理和流程,并通过两次对空压机叶轮喷水冲洗的操作实践,总结了叶轮喷水冲洗具有降低空压机的轴振动值和提高其空气处理量的作用。     

DH63-32型离心空压机检修总结

介绍豫光金铅制氧厂DH63-32型离心空压机检修前存在的排气量减少、级间冷却器阻力增大和轴振动值偏高等问题及原因,阐述空压机存在的机械故障及其处理措施,最后总结了空压机检修经验。     

数码涡旋变容制冷系统冷凝器动态特性分析

针对数码涡旋压缩机的容量调节方式,将冷凝器内部流量的响应规律转化为外部一个变化的流量输入信号,建立数码涡旋变容制冷系统的冷凝器仿真模型;分析了热负荷、出风温度、制冷剂进口压力在不同容量输出下的动态变化特性。结果表明,在容量调节作用下,热负荷、出风温度呈现出周期性波动趋势,但其总体是随容量输出比例的降低而减小;而制冷剂进口压力变化不显著。     

Control optimisation of CO2 cycles for medium temperature retail food refrigeration systems

This paper describes a detailed procedure into the investigation of optimised control strategies for CO₂ cycles in medium temperature retail food refrigeration systems. To achieve this objective, an integrated model was developed composing of a detailed condenser/gas cooler model, a simplified compressor model, an isenthalpic expansion process and constant evaporating temperature and superheating. The CO₂ system can operate subcritically or transcritically depending on the ambient temperature. For a transcritical operation, a prediction can be made for optimised refrigerant discharge pressures from thermodynamic cycle calculations. When the system operates in the subcritical cycle, a floating discharge pressure control strategy is employed and the effect of different transitional ambient temperatures separating subcritical and transcritical cycles on system performance is investigated. The control strategy assumes variable compressor speed and adjustable air flow for the gas cooler/condenser to be modulated to achieve the constant cooling load requirement at different ambient conditions.     

HP410型空压机轴振动超标故障分析及处理

介绍HP410型空压机运行时轴振动超标的故障,原因是二级叶轮被从中间冷却器来的压缩空气中夹带的水分冲击而腐蚀以及轴瓦间隙超标,更换二级叶轮及改进轴瓦结构形式后,改善了轴瓦的承载力并有效减小了空压机的轴振动值。     

数码涡旋多联机制热控制策略的研究

针对多联机常规的制热控制策略导致系统运行不稳定的特性,提出新的控制策略,建立了压缩机输出比控制模型和压缩机切换控制模型,设计一套10HP数码涡旋多联机系统进行验证.控制模型中以一个周期时间内排气压力的平均值作为当前压力值按照给定的目标压力区域来调节压缩机输出比,并给出了控制模型中的目标压力基准值的确定原则.压缩机切换控制策略中,设置数码压缩机为优先级高的压缩机,调节其输出能力,直到100％输出比,再切换启动定频压缩机,有利于提高性能系数.实验证明这种控制策略对提高系统运行的稳定性、可靠性以及性能系数是可行的.     

An NTU-ε model for alternative refrigerants: Un modèle NTU-ε pour les frigorigènes de remplacement

This paper presents a steady state simulation model to predict the performance of alternative refrigerants in vapour compression refrigeration/heat pump systems. The model is based on the NTU-ε method in analysing the heat exchangers following an elemental approach. The model extends its applicability to new refrigerants including hydrocarbons and uses a large database of REFPROP package for refrigerant properties. The main inputs to the model include the physical details of the heat exchangers, compressor efficiency, mass flow rates of heat transfer fluids and their inlet temperatures to the evaporator and the condenser, the pressure drops across the heat exchangers and the capacity of either the evaporator or condenser (in kW). The model results are validated with a wide range of experimental data of HCFC22 and propane (HC290) on a heat pump test facility for a number of parameters, e.g. coefficient of performance, condenser capacity, mass flow rate of the refrigerant and compressor discharge temperature. Although the model is currently tested for pure refrigerants using compact brazed plate (counter flow type) heat exchangers, it can also be applied to mixture of refrigerants as well as to other types of heat exchangers.     

空压机二级振动异常的原因分析与处理

介绍一起空压机二级振动异常的故障,分析了故障原因,通过安装空压机叶轮在线清洗系统解决了叶轮结垢问题,保证空压机安全运行。     

数码涡旋管道机制冷变风量运行的实验研究

对采用数码涡旋压缩机的风管送风式空调(热泵)机组在标称制冷工况下的变风量运行进行了实验研究,得出了机组制冷能力、功耗、机组效率、出风温度、排气压力、排气温度、吸气压力等参数随风量变化的关系,分析了采用数码涡旋压缩机的管道机变风量运行的特点,为风管送风式空调(热泵)机组的节能、稳定运行提供了有价值的实验支撑。     

Performance analysis and simulation of automobile air conditioning systemAnalyse de la performance et simulation d'un système de conditionnement d'air automobile

Performance analyses of separate components of an automobile air conditioning system have been carried out under various operating conditions. The air conditioning system consists of a laminated type evaporator, a swash plate type compressor, a parallel flow type condenser, a receiver drier and an externally equalized thermostatic expansion valve. A computer program for performance analysis of the laminated type evaporator has been developed on the basis of the overall heat transfer coefficient and pressure drop which were obtained experimentally. A computer program for performance analysis of the parallel flow type condenser, using an empirical equation for the heat transfer coefficient, has been developed, which demonstrates that the predicted condensing capacity agrees very well with the experimental data. Then, a model for combining the performance analysis programs of separate components of an automobile air conditioning system is proposed, which simulates very well the performance of the integrated automobile air conditioning system. Further, the effects of condenser size and refrigerant charge on the performance of the integrated automobile air conditioning system are discussed.     

空压机三级出口波纹膨胀节损坏的分析和处理

介绍KDON-18000/18000型空分设备配套空压机在用水冲洗叶轮时发生的三级出口波纹膨胀节被拉伸损坏的经过,分析了波纹膨胀节被拉伸损坏的原因以及对空压机三级叶轮轴振动造成的影响,叙述了临时处理措施和停机后的处理方法,并总结经验教训。