高压容器充气及气密性试验检测系统的设计

介绍了一套可采取自动和手动两种控制方式,对高压容器、阀体、管材、连接件等产品安全地进行耐压、气密性试验的充气及在气密试验压力下检测所需漏率值的检测系统的工作原理和特点。     

Study on double differential pressure measurement method of gas-liquid two-phase flow in high gas content wells

The production of natural-gas wells contains natural gas and a small amount of liquid, which is a wet gas composed of oil, gas and water. For dynamically monitor the liquid and gas production from a single well, there is an urgent need for a low-cost, small-volume online metering device for wet gas flows through a single well. Aiming at the problem, this paper designs a wet gas flow measurement device for a long-throated Venturi tube based on the double differential pressure method. By combining experiments and numerical simulations, a matching flow calculation model was developed. Based on the experimental data of NEL's 6-inch standard Venturi tube wet gas over-reading, the numerical simulation method is used to carry out the research of high-pressure wet gas measurement under the pressure condition of 2, 4 and 6 MPa. The simulation results of two multiphase flow models, DPM and Euler, are compared with the experimental values of NEL. The results show that the maximum relative error is less than 10%, and the Euler model is more suitable for the numerical simulation of high-pressure wet gas. According to the actual production from the gas well, a long-throated Venturi tube with a throttling ratio of 0.5 and a diameter of DN50 was designed, and a numerical simulation study of wet gas under a pressure of 2, 3 and 4 MPa was carried out. Numerical simulation results show that the change laws of over-reading and liquid-gas mass ratios of high-pressure wet gas are consistent with those of low-pressure wet gas. The numerical simulation results are used to correct the flow calculation model of low-pressure wet gas, and a flow calculation model suitable for high-pressure wet gas in gas wells is obtained. The gas flow prediction accuracy of the flow calculation model was lower than ±3%, and the liquid flow prediction value was lower than ±10%. Compared with other measurement methods without separation of wet gas, the long-throated Venturi tube based on the double differential pressure method has a simple structure and low measurement cost. By further optimizing and expanding the measurement model, after improving the accuracy, it can be installed in the wellhead pipeline to monitor the oil and gas production from a single well in real time. This can provide support for gas reservoir exploitation decisions.     

空气压缩机模型级用于不同真实气体的气动性能研究

基于机器马赫数相等的相似变换准则,对不同真实气体工质同一离心压缩机模型级进行常温常压及高温高压下气动性能的数值研究。除了空气,选取的气体工质还包括二氧化碳和丙烯两个重介质以及一个轻介质甲烷。通过分析不同工质的物性和模型级气动性能变化规律,寻找影响不同工质模型级性能变化的主要因素。结果表明:在机器马赫数相等的条件下,工质远离临界区时,模型级内部流场受比热比影响较大,导致不同真实气体的级性能随比热比的变化而改变,流场内部流动损失及压力随比热比的增大而增大。当模型级进出口比热比变化较小时,比热比越大,级效率越低,压比越高,但能头系数变化较小;进出口比热比变化较大时,级性能变化比较大。     

高温高压阀门的带压堵漏

简述了高温高压阀门泄漏对生产的影响，分析了阀门泄漏的原因。通过一起成功的实例。介绍了在不停车条件下对高温高压阀门进行带压堵漏的技巧。     

焦炉集气管压力Fuzzy-PID控制与仿真

焦炉集气管压力控制系统是一个具有多耦合、强干扰、时变和非线性特点的系统,传统的PID控制很难达到理想的控制效果。针对这种情况,本文采用基于Fuzzy-PID分级复合型控制的智能控制方案对其进行控制。并利用MATLAB中的Simunnk和Fuzzy工具箱,对其进行了仿真。仿真结果表明,该方法有效提高了系统的稳定性和快速性以及抗干扰性。     

热、气、固耦合流动数值模拟在管式膨胀系统中的研究

应用相似理论和合理的相似比,得出6400ks／h高温管式膨胀设备的结构模型。采用“小滑移”模型,并利用ANSYS／FLOTRAN CFD对其进行了数值模拟,得出整个三维模型流场的温度、速度及气固两相的分布,与2400ks／h高温管式膨胀设备实测值吻合较好。     

Analysis of high pressure tests on wet gas flow metering with a Venturi meter

This work deals with the flow metering of wet gas issued from high pressure natural reservoirs. Some recent results obtained from tests performed on the CEESI facilities are presented. They are performed at 75 bar with 0.6 beta ratio Venturi meter installed in horizontal pipe configuration. Correction factors obtained are compared to predictions deduced from the flow modelling inside of the meter. These results are analysed in order to explain the agreements or disagreements obtained between the experiments and the flow modelling.     

高温高压临氢阀门制造工艺的分析

阐述了石化工业生产中高温高压临氢介质对阀门的要求,介绍了高温高压临氢阀门制造中,承压壳体材料、机械加工、特殊工序和整机检查试验等过程的控制要点。     

基于SimulationX的挖掘机高压斗杆缸缓冲装置的仿真与试验研究

为研究高压油缸的行程末端缓冲装置的缓冲性能,获得油缸缓冲行程阶段的压力、流量等参数,以一款国产挖掘机高压斗杆缸作为研究对象,将计算机仿真技术应用到实际工程研究中。基于SimulationX仿真软件搭建了挖掘机工作装置液压系统的仿真模型(特别是缓冲模型),开展了液压-机械多体动力学联合仿真;在典型工况下对液压挖掘机斗杆缸的压力、流量等参数进行了试验,通过比对仿真结果,对控掘机液压系统仿真的准确性进行了评价。结果表明,所建立的仿真模型是合理的、科学的,该仿真技术在工程领域更进一步的推广是可行的。     

一种高温超高压条件下的三腔压力分隔装置设计

针对高温超高压条件下三腔压力在一个容器内难建立、难传递等问题,设计了一套三腔压力分隔装置。该装置结构简单实用,不仅能稳定建立三腔压力、模拟地层结构环境,且可实现围压和孔隙压力间的有效传递。     

A CFD study of wet gas metering over-reading model under high pressure

The venturi flow meter is increasingly being preferred in multiphase flow measurement because of its shorter upstream and downstream straight sections, less influenced by the flow pattern and relatively small pressure loss. However, when the venturi is used for wet gas measurement, the over-reading phenomenon occurs due to the presence of a small amount of liquid. Many scholars have established over-reading models to correct the measured values of wet gas. Regrettably, the applicability of these over-reading models under actual high pressure operating conditions has not been verified. Therefore, this review focuses on numerical simulation of the flow of wet gas in the venturi tube under high pressure conditions (11MPa/13MPa/15 MPa). The discrete phase model (DPM) and the standard k-ε model was employed in this review. The simulations results reveals the flow characteristics of wet gas in venturi tube, which includes the flow field distributions, droplet concentration distributions and wall pressure profile distributions, and indicates that the over-reading values increases with the increase of Lockhart-Martinelli parameters and gas volume flow rate, but decreases with the increase of pressure. Moreover, the ISO model has the best performance under high pressure conditions.     

超高压气动吹除阀动态特性及仿真研究

介绍了超高压气动吹除阀的工作原理,根据实际气体状态方程,建立了超高压气动吹除阀数学模型。采用MATLAB/Simulink进行仿真,分析了结构参数和边界条件变化对超高压气动吹除阀动态特性的影响。研究结果对超高压气动吹除阀的优化设计具有理论指导意义。     

高温高压阀门用金属自密封环的研制

介绍了具有优良使用性能，可替代进口产品的金属自密封环的研制，包括选材、制定特殊锻造工艺、制定机械加工工艺规程和软化处理等。     

套筒式高温高压电磁阀研制

介绍了套筒式高温高压电磁阀的技术参数、工作原理和技术特点,论述了套筒与阀体分离式密封结构、组合式阀瓣及适用于高温的高压差和低压差状态的低泄漏与长寿命刚性阀座密封副等先进结构的设计。     

高压调压器原理分析及维护

介绍了高压调压器的调压原理及结构特点,分析了调压器常见故障,总结了调压器日常维护方法。     

提高高温高压电磁阀可靠性和维修性的途径

对比分析了国内国外高温高压电磁阀的可靠性和维修性,探讨从技术设计和制造过程采取可行的途径,以提高高温高压电磁阀的可靠性和维修性。     

高温高压双金属片式疏水阀的设计

介绍了高温高压双金属片式疏水阀的工作原理以及特殊结构的设计,论述了双金属片材料和组合结构的选择,优化了阀门在恶劣工况下阻汽排水性能。     

高压消声降噪球阀研究

针对流体流经球阀时的具体工况,研究产生噪声和振动的声学原理,对球阀的结构提出改进,有效降低高压球阀启闭时的噪声和振动。     

提高超高压阀门寿命的措施

分析了超高压阀门失效的原因，论述了超高压阀门用材料选择，介绍了提高材料性能的热处理和表面硬化处理方法，提出了提高超高压阀门寿命有效措施。     

Wet gas meter based on the vortex precession frequency and differential pressure combination of swirlmeter

A wet gas meter, based on combination of two dissimilar output signals from swirlmeter, i.e. the vortex precession frequency and the differential pressure of swirlmeter, was designed and investigated in low pressure wet gas flow. A wet gas measurement model with the simultaneous equations from the two correlations of swirlmeter has been established, and then the iterative solution algorithm is given. The proposed wet gas meter predicts the gas mass flow rate errors within ±8% from 91.3% tested samples, and the liquid mass flow rate errors within ±20% from 89.2% tested samples, which may be used to meter both gas and liquid flow rates for wet gas flow with X?0.12$X?0.12$. In view of installation, maintenance and cost, the proposed approach is cost-effective due to using only a flow sensor.