一种可编程控制器空气压缩机电气控制系统

采用常规继电器、智能单片机和小型可编程控制器的电气控制系统存在技术要求较高、设备管理复杂等问题,在研究空压机的硬件架构基础上,分析空压机控制系统的控制对象、控制过程和控制要求,设计出一种可编程控制器空气压缩机电气控制系统,最后通过形式化仿真模型进行仿真,发现PLC控制器在系统中具有高可靠性、易维护、信息化等优势。     

C150M×3型空压机运行分析及改进措施

简述了C150M×3型空压机的结构和工作原理,详细分析了机组在运行过程中出现的振动高、级间换热器结垢和扩压器腐蚀等问题的原因,提出相应的改进措施。     

LNG接收站BOG压缩机活塞故障分析

BOG压缩机迷宫式密封的活塞在磨合过程中出现撞缸与拉缸,在拆解分析后,对其进行相应的修复与整改,指出了出现该故障的根本质原因,提出了改进建议。     

An investigation on the impact fatigue characteristics of valve leaves for small hermetic reciprocating compressors in a new automated test system

This paper presents an investigation on the impact fatigue characteristics of valve leaves that are prevalently used in hermetic reciprocating compressors especially for the household type refrigerators. A unique automated impact fatigue test system has been designed and produced, which enables to carry out impact fatigue tests of the compressor valve leaves under the desired impact velocities. The test system incorporates a noncontact actuation, a data acquisition system and an acoustic‐based damage detection technique, which continuously monitors the health of the structure. The damage detection system allows parametrical investigation on the impact fatigue life by detecting any possible damage and automatically terminating the test. The investigation relates the impact fatigue lifetime of the valve leaves with the impact velocity, asymmetrical impact, operation temperature, material type (carbon strip steel, stainless strip steel and new stainless strip steel grade) and tumbling operation duration. The observations show that the cracks have initiated from the edges of the valve leaf where is in contact with the valve plate. Subsequently, the cracks initially have propagated in the radial direction inwards the center of the impact area. Various failure cases have been resulted in by either a single crack or inter‐related multiple cracks. Microscopic and metallographic observations have been performed on the specimens to enhance the understanding of the damage mechanisms. The investigation and introduced test system guide the design optimization of the valve leaves in terms of compressor performance due to the energy consumption and lifetime of the valve leaf.     

大型工艺螺杆压缩机振动分析及解决措施

针对新投用的3台火炬气回收螺杆压缩机组出现振动偏大的问题,通过现场振动监测频谱分析和对机组管线布置相结合的方法,找出了机组振动偏大的主要原因,并提出了相应的改进措施,成功的解决了机组振动大的问题,确保了机组安全平稳长周期运行。     

无级气量调节系统在新氢压缩机中的应用

分析齐鲁炼油厂第三柴油加氢装置新氢压缩机增上无级调量系统的可行性,简要介绍无级调量系统的基本原理,阐述新氢压缩机增上无级调量系统的调试和节电效果。     

一级压缩机频繁高温关停问题处理

针对崖城作业公司南山终端液化石油气节能项目投产后出现天然气一级压缩机频繁关停造成天然气大量排放的问题,对投产前后的工艺参数进行比较、分析和调整,在不进行工程改造和提升设备技术水平的情况下,通过压缩机的负荷转移,解决了这一难题。     

Analysis of switched quantizer based on the quadratic spline functions

In this paper, an approximation of the optimal compressor function using the quadratic spline functions with 2L?=?8 segments is described. Since the quadratic spline with 2L?=?8 segments provides better approximation of the optimal compression function than quadratic spline with 2L?=?4 segments, capitalizing on the benefits of the obtained spline approximation, quantizer designing process is firstly performed for the so assumed number of segments and the Laplacian source of a unit variance. Then, to enhance the usability of the proposed model, the switched quantization technique is applied and a beneficial analysis is derived, providing insight in the robustness of the proposed quantizer performances with respect to the mismatch in designed for and applied to variances. Reached quality has been compared to another model from the literature, and it has been shown that the proposed model outperforms the previous model by almost 1.3?dB.     

新版《压缩空气站设计规范》中节能、安全和环保条文分析

新版GB50029《压缩空气站设计规范》在站房布置、设备选型、系统流程等方面提出了许多新的规定,强调压缩空气站及其系统的节能、安全和环保。本文就有关条文进行了分析和阐述。     

Variable wall thickness scroll geometry modeling with use of a control volume approach

In a scroll-type compressor, compression is achieved through relative contact between two spiral curves. Since the scroll invention by Leon Creux (1905), multiple methods have been developed for calculating scroll geometry. What can generally be considered the most classical method, is defining each scroll curve as the involute of a circle. Gravesen and Henriksen (2001) introduced a new method to calculate scroll geometry by deriving each scroll curve from the radius of curvature parameterized with involute angle. This allows a wide range of involute geometries to be considered not included in the classical method. In this paper, Gravesen's method is extended to the tip region to include all tip geometries involved in a two arc configuration resulting in a more comprehensive scroll geometry definition. Lastly, with parametric representation of all scroll geometry, the pocket volume can be easily solved using a derived control volume approach.