煤矿空压机节能及余热回收系统设计

为解决当前煤矿空压机电能消耗过大且效率较低的问题,结合实际生产开展了空压机节能设计和余热回收系统设计方面的研究。空压机节能方面,通过重新选型空压机及采用变频节能启动达到目的;余热回收系统方面,通过配置不同型号的余热回收系统实现对热能的回收利用。最后验证了空压机节能改造和余热回收系统的实际应用效果。实践证明,设计取得了理想效果。     

空压机节能改造与应用分析

在工业行业的中空压机具有非常大的作用,然而其属于能耗非常大的一种工艺设备。对空压机节能改造与应用现状进行了介绍,结合空压机节能改造现状和改造原理,对耗能原因进行了分析,并对空压机节能发展和改造后的应用做了深入研究。     

空压机节能方法探析

叙述了空压机的原理、特点,指出了空压机运行的问题,提出,选购与使用空压机的原则及空压机的节能方法。     

上海空压机系统能效现状及节能对策

介绍了几种常用的空压机系统节能技术,并通过对上海工业领域空压机系统能效现状调研,提出空压机系统的节能思路。     

变频技术在大功率交流异步电动机驱动空压机中的应用

介绍了传统空压机控制现状及变频技术的工作原理,阐述了变频技术控制大功率交流异步电动机驱动空压机的改造方案,并给出了改造的实施方法,为大功率交流异步电动机空压机节能控制改造和安全运行提供了经济实用的方法.     

漳山电厂空压机变频改造

空压机是电厂最重要的设备之一,为使空压机能提供稳定的压力及经济运行,对空压机进行变频改造,通过对改造前后变频节能分析得出较安全和经济运行模式.     

关于空压机节能技术和能量利用的探讨

为做好节能减排工作,提高企业经济效益,该文介绍了变频技术在空压机节能改造中的应用和空压机余热回收工程的巨大的发展前景,这也是空压机技术发展的方向。     

全厂空压机系统优化节能技术改造

对国电福州发电有限公司全厂空压机系统的布局形式和运行特点进行科学合理分析,提出具体的系统节能优化改造方案.通过系统优化升级改造,不仅取得了可观的节能经济效益,而且大大提升了空压机系统的安全稳定性.通过实例说明发电企业可以通过自身内部挖潜降耗等经营管理手段来缓解企业经营压力,实现可持续发展.     

推广应用新型单螺杆空压机节能经济效益显著

本文简介5L-40／8型老式空压机存在的缺陷,重点介绍FHOG340W型单螺杆空压机的特点、结构、工作原理和节能经济效果。     

抓好空压机的技术改造和节能工作

空压机的技术改造 ,是煤矿节能的重要措施之一。文中介绍了对立式双缸和 L型空压机技术改造中采用工程塑料 ,加强管理等措施 ,取得了明显的节能效益     

小型离心压气机结构参数优化与流量特性的仿真分析

压气机的流量特性（图）是压气机使用的主要参考依据,但是目前仍主要依靠试验方法得到。笔者探讨利用稳态可压缩粘性流体微分方程和k-ε两方程紊流模型,采用有限体积法对离心压气机的工作状况进行三维仿真计算。对某型压气机,通过改变扩压器和k-ε蜗壳结构参数,得到优化模型。根据优化模型在每一转速不同出口静压工况下的计算结果,得到压气机的流量特性图。结果表明,CFD方法可以得到压气机的流量特性图,并且可以方便地分析压气机各部分的流动损失,是压气机设计及性能前期预测的一种有效方法。     

Theoretical and experimental studies of water injection scroll compressor in automotive fuel cell systems

A water injection scroll compressor to supply clean compressed air to an automotive fuel cell system is researched. The water is used as both the lubricant and coolant in the compressor. A thermodynamic model of the water injection scroll compressor considering leakage and heat exchange for use with an automotive fuel cell system was developed using the conservation of energy and mass equations and the equation of state. The results show that the scroll compressor has nearly isothermal compression when injecting water in it. Increasing the compressor rotation speed increases the discharge loss and the volumetric efficiency of the scroll compressor. The difference between the calculated power and the isothermal power increases as the compressor rotation speed rises, which means the efficiency of the compressor decreases. Increasing the flow rate of water injected increases the indicated isothermal efficiency and decreases the discharge temperature. Under the condition studied, the mass flow rate of water has the greatest effect on the discharge temperature.     

An experimental analysis of cycling in an automotive air conditioning system

In the majority of automotive air conditioning systems, the compressor continuously cycles on and off to meet the steady-state cooling requirements of the passenger compartment. Since the compressor is a belt-driven accessory device coupled to the engine, its cycling rate is directly related to the vehicle speed. The refrigeration system’s losses increase with increasing vehicle speed and thus with increasing compressor cycling. This paper identifies and quantifies individual losses in an automotive vapor-compression refrigeration system during compressor cycling. The second law of thermodynamics, in particular, nondimensional entropy generation, is used to quantify the thermodynamic losses of the refrigeration system’s individual components under steady driving conditions at idle, 48.3 kph (30 mph), and 96.6 kph (60 mph). A passenger vehicle containing a cycling-clutch orifice-tube vapor–compression refrigeration system was instrumented to measure refrigerant temperature and pressure, and air temperature and relative humidity. Data were collected under steady driving conditions at idle, 48.3 kph (30 mph), and 96.6 kph (60 mph). A thermodynamic analysis is presented to determine the refrigeration system’s performance. This analysis shows that the performance of the system degrades with increasing vehicle speed. Thermodynamic losses increase 18% as the vehicle speed changes from idle to 48.3 kph (30 mph) and increase 5% as the vehicle speed changes from 48.3 kph (30 mph) to 96.6 kph (60 mph). The compressor cycling rate increases with increasing vehicle speed, thus increasing the refrigeration system’s losses. The component with the greatest increase in thermodynamic losses as a result of compressor cycling is the compressor itself. Compressor cycling reduces the compressor’s isentropic efficiency, and thus the system’s thermodynamic performance. The individual component losses of the refrigeration system are quantified. The redistribution of these losses is also given as a function of increasing vehicle speed (i.e. increasing compressor cycling). At 96.6 kph (60 mph), the thermodynamic losses, based on the ratio of entropy generation to entropic load, are 0.22, 0.10, 0.07, and 0.02 in the compressor, the condenser, the evaporator-accumulator, and the orifice tube, respectively. The compressor losses dominated the overall system performance. The overall system efficiency could be significantly improved by increasing the compressor’s efficiency. The compressor’s efficiency could be improved by reducing or eliminating cycling, such as could be accomplished by using a variable capacity compressor or by not directly coupling the compressor to the engine. Another way to increase the compressor’s volumetric efficiency during cycling would be to reduce the compressor operating range. This could be accomplished by using two compressors such as is done in two-stage cascade refrigeration systems.     

S-CO2布雷顿循环中离心式压缩机研究现状

从小型离心式压缩机运行效率和冷凝影响两方面介绍了国内外机构对S-CO2离心式压缩机研究的现状。指出:采用小型离心式压缩机对布雷顿动力循环系统中压缩机的设计和理论研究进行实验验证仍是最优的方案;应充分利用现有技术深入研究小型离心式压缩机内部流场分布和边界层的影响,为S-CO2离心式压缩机设计与优化提供理论支持。     

多级轴流压气机模化设计中尺寸缩放对气动性能影响的数值研究

为了研究几何尺寸模化缩放及叶尖间隙对多级轴流压气机气动性能及内部流动的影响,采用Numeca程序对17级轴流压气机开展了数值计算。结果表明：在80%及100%等高转速条件下压气机效率随着模化比例增大而增大,而在50%转速下模化缩放对压气机效率的影响较小。相对于原型压气机,模化放大时,压气机前8级单级压比均有所降低,而后8级压比均提高;模化缩小时,压气机的变化规律则相反。随着压气机几何尺寸的增大,静叶叶根和叶尖区域的总压恢复系数显著提高。同时,叶片叶尖泄漏流区域的熵增减少,从而使各级效率均有所提升。缩放模化中,随着叶尖间隙的增大,泄漏流增多,恶化了动叶叶尖附近的流动分离,降低了动叶后50%弦长区域的相对马赫数,同时扩大了静叶上端壁的流动分离,使压气机效率降低。     

压气机蜗壳通道中气流流动的数值模拟

利用任意拉格朗日 -欧拉 (AL E)计算方法对基于“等环量”理论并考虑气体粘性而设计的蜗牛式压气机蜗壳进行了数值模拟。模拟计算结果与试验所测得的结果基本吻合 ,证明利用本计算程序所进行的数值模拟是可行的 ,计算结果对蜗牛式压气机蜗壳的优化设计具有参考价值     

零间隙压气机失稳机理的全通道数值模拟研究

为了探究零间隙压气机流动失稳机理,采用全通道非定常数值模拟方法研究了一台零间隙斜流压气 机转子的失稳机理,数值模拟过程中在转子出口施加了随时间动态变化的背压模拟压气机转子节流,非定常 数值计算结果表明零间隙斜流压气机转子仍然表现为典型突尖流动失稳特征。通过详细地分析斜流压气机 转子节流过程中不同阀系数对应的压气机内部流场结构,结果表明:尽管零间隙斜流压气机无叶顶泄漏特 征,但随着对压气机节流,转子叶片尾缘率先出现流动分离,进一步节流,尾缘流动分离表现为一方面在周向 范围加剧,另一方面分离点逐渐向上游移动,造成通道严重堵塞,最终引发相邻叶片通道尾缘回流和叶片前 缘流动溢出进而诱发叶片通道内部出现径向涡结构,从而形成压气机突尖失速先兆。     

Thermo‐economic Optimization of Gas Turbine Power Plant with Details in Intercooler

In this paper a gas turbine power plant with intercooler is modeled and optimized. The intercooler is modeled in details using the ε ? NTU method. Air compressor pressure ratio, compressor isentropic efficiency, gas turbine isentropic efficiency, turbine inlet temperature, cooling capacity of the absorption chiller, recuperator effectiveness as well as eight parameters for configuration of the intercooler are selected as design variables. Multi‐objective genetic algorithm is applied to optimize the total cost rate and total cycle efficiency simultaneously. Two plants including an intercooler and with/without air preheater are studied separately. It is observed that the air compressor pressure ratio in the HP compressor is higher than the LP compressor in both cases and its differences are higher for a plant without an air preheater. Actually the air compressor pressure ratio is found to be about 8.5% lower than the ideal value and 9.5% higher than the ideal value in the LP compressor and HP compressor, respectively, in the case with an air preheater. Moreover, a correlation for intercooler pressure drop in terms of its effectiveness was derived in the optimum situation for each case. © 2013 Wiley Periodicals, Inc. Heat Trans Asian Res, 42(8): 704–723, 2013; Published online in Wiley Online Library ( wileyonlinelibrary.com/journal/htj ). DOI 10.1002/htj.21051     

空气压缩机窜油质量问题的试验研究及其设计改进

现有D114系列柴油机的空气压缩机的窜油故障率较高,影响机油耗率和空气压缩机的可靠性,用户反映强烈。经试验研究,对空气压缩机的进气接头内径、进油孔径以及缸体与曲轴箱的连接作了改进设计,并取得了成效。     

Research Progress of Tip Winglet Technology in Compressor

In the present study,the research progress of tip winglets that control tip clearance leakage flow in compressors is reviewed.Firstly,the effects of tip leakage flow on the aerodynamic performance of the compressor are presented.Subsequently,the development of tip winglet technology is reviewed.Next,a series of studies on compressor tip winglet technology are conducted.Besides,the effects of tip winglets on the aerodynamic performance of rectangular cascades of low-speed and high-subsonic compressors,subsonic compressor rotor and transonic compressor rotor are discussed,respectively,and the control effect of tip winglet technology combined with tip groove design on tip leakage is investigated.Lastly,the subsequent development direction and research prospect of compressor tip winglet technology are presented.