给水泵汽轮机润滑油系统建压慢原因分析及改进措施

以某公司3台660 MW机组为例，分析了给水泵汽轮机润滑油泵在切换过程中出现的备用油泵油压建立慢，导致润滑油母管压力低，易造成给水泵汽轮机跳闸的问题。通过机理分析及现场调试，找出了润滑油泵油压建立慢的原因，制定了相应的应对措施并实施改进，提高了发电机组运行安全性。     

某电厂3、4号机组汽轮机启动过程中润滑油压低原因分析及处理措施

针对某电厂3、4号机组汽轮机启动过程中润滑油压低现象进行了原因分析,通过机组检修对存在的问题进行了处理,并对运行及检修人员提出了防范措施。     

锥度切换装置在汽轮机润滑油在线切换过程中的应用

汽轮机润滑油系统在汽轮机安全运行中担负着至关重要的作用,一旦供油系统出现断油现象,就会给机组运行造成极大的影响,比如烧坏轴瓦,使机组无法运行。为了使机组能够安全、可靠长时间运行,汽轮机润滑油系统一般设计两套润滑油供油回路,两套互为备用,目前这两套共供油系统一般采用六通切换阀切换。目前常用六通切换阀存在造成使汽轮机断油的风险,基于此,需要一种新型结构安全可靠的润滑油在线切换装置,可以极大降低该风险。     

浅谈汽轮机润滑油系统主要问题分析及处理

本文针对汽轮机机组润滑油系统在运行期间所涉及的常见问题进行分析,分别概括了主机润滑油温度异常升高、主油箱排烟风机着火、以及盘车装置自投困难这三个方面问题的产生原因以及防范措施,希望能够引起业内人士的关注与重视,以确保汽轮机机组润滑油系统的安全、可靠、经济运行。     

汽轮机润滑油系统及其油压低故障分析

润滑油系统是汽轮发电机组的重要组成部分,同时也是保证汽轮机组安全稳定运行的基础,因此,从汽轮机润滑油系统的作用、组成、工作原理出发,分析汽轮机润滑油低压故障的原因,包括操作不规范、冷油器堵塞、润滑油系统泄漏、油箱油位过低,并提出了相应的处理措施,希望可以给相关工作人员提供借鉴。     

基于键合图理论的汽轮机润滑油系统建模及仿真分析研究

汽轮机润滑油系统作为影响汽轮机组安全运行的重要系统,因存在多种能量的耦合,使其建模和仿真工作具备一定的复杂性。本文针对某电厂汽轮机润滑油系统,分析了其流体能量学性质和热力学性质,并基于伪功率键合图理论建立了该系统的数学模型。利用Matlab/Simulink对所建立的数学模型进行仿真及分析,验证了该建模方法及数学模型的正确性和有效性,为汽轮机润滑油系统设计验证和分析评价提供了精确的模型对象。     

浅谈沙角A电厂汽轮机润滑油带水的原因及处理

主要针对沙角A电厂(以下简为本厂)#4、#5机组投运初期润滑油严重带水的原因及危害进行了分析,并提出了处理措施,以确保汽轮机安全稳定运行。     

给水泵汽轮机组润滑油系统交流润滑油泵连锁跳机故障浅析及解决方案

介绍了给水泵汽轮机组润滑油系统设计原理和设备配置,对于交流润滑油泵连锁时机组跳机问题,给予了分析并提供了解决方案。     

给水泵汽轮机油质恶化原因分析及解决方案

某厂2×330MW亚临界机组给水泵汽轮机运行过程中,因水分、颗粒度超标导致润滑油品质变差。文章从油箱负压、轴封压力、给水泵密封水、油箱材料等方面进行原因分析,并针对性地提出解决措施,减轻油中水分、颗粒度的超标程度,延长润滑油的使用寿命,为给水泵汽轮机的安全、经济运行奠定基础。     

工业汽轮机固定瓦推力轴承改进及效果研究

工业汽轮机运行中转子轴向推力由汽轮机推力轴承承担,同时保证汽轮机通流部分及静止部件的轴向位置。故此,工业汽轮机安全运行的首要条件就是推力轴承正常运转。推力瓦块工作稳定是影响推力轴承工作的主要因素,若机组运行时瓦块温度过高将导致运行负荷裕量过小,使瓦块磨损速度加快,造成润滑油质老化,甚至可能将瓦块烧毁,导致汽轮机严重损坏。故此,本文对轴瓦块温度过高的原因进行了分析,并给出了相应的改进措施。     

田坝水电站水轮机选型及结构设计

根据田坝水电站的水头参数、泥沙含量及运行情况,在水轮机选型时充分考虑能量特性、汽蚀特性及稳定性等方面的因素,选用2种转轮直径(两大一小)的水轮发电机组。在水轮机结构设计时,考虑到机组均属于中高水头小型水轮机,对水轮机的强度、刚度和狭小空间及抗磨蚀方面有着特殊的要求,因而在结构、材质及制造方面相应地采取了一些措施。     

田坝水电站水轮机选型及结构设计

根据田坝水电站的水头参数、泥沙含量及运行情况,在水轮机选型时充分考虑能量特性、汽蚀特性及稳定性等方面的因素,选用2种转轮直径（两大一小）的水轮发电机组。在水轮机结构设计时,考虑到机组均属于中高水头小型水轮机,对水轮机的强度、刚度和狭小空间及抗磨蚀方面有着特殊的要求,因而在结构、材质及制造方面相应地采取了一些措施。     

利用电厂循环水余热的吸收式热泵模拟研究

通过对热泵系统整体质量平衡、热平衡和内部部件之间的传热分析,建立了增热型吸收式热泵数学模型,并用该模型分析了某电厂热泵机组在运行中循环水温度、热网供水温度和汽轮机抽汽压力对机组制热系数的影响,通过模拟得出在不同工况下维持热泵机组制热系数在1.66以上所对应的汽轮机抽汽压力的变化范围。     

基于小偏差方法的燃气轮机气路故障判据的建立

根据燃气轮机实际运行的热力学过程,建立了某型燃气轮机正常运行状态下的数学模型,在该正常模型的基础之上运用小偏差法得到小偏差方程组.然后向小偏差方程组中引入故障因子,最终获得标准故障模型.结合气路故障性能参数变化判据,确定出典型气路故障与测量参数之同的隶属度大小关系.最终获得典型气路故障的测量参数变化判据,为燃气轮机气路故障诊断奠定基础.     

Experimental studies on the flow characteristics in an oscillating water column device

A fixed type oscillating water column (OWC) device was designed and tested in a 2-D wave channel. The air chamber was converged to its minimum area at the turbine section to obtain the maximum kinetic energy. The variations in the height of water in the water column and in the static pressure of the air caused by the oscillating waves were studied in detail. The airflow in the entire air chamber was documented with particle image velocimetry measurements. No turbine was installed in the device. The experiments were performed by varying the water depth and the wave frequency. It was found that the air velocities in the turbine chamber during the upward motion of water in the column are always larger than during the downward motion. While the airflow was strong most of the time, very low air velocities were recorded during the transition between the upward and downward flows indicating the need of an airflow regulator before the turbine to get a constant flow rate of air. The well-directed flow obtained at the turbine section can be used to drive a Savonius rotor, which is the most appropriate turbine for rectangular cross-section of the chamber.     

Study on Sludge Formation during the Oxidation Process of Turbine Oils

Against the backdrop of increased needs for longer operating life of turbine oils, there is a tendency to use amine-type antioxidants for steam turbine oils as well as gas turbine oils. Amine-type antioxidants are known to form sludge during the oxidation process, and the sludge formation from turbine oils involves the high risk for a power plant of bearing temperature rise caused by sludge deposition onto the bearing surface. But currently, there is no global specification to evaluate the sludge formation from turbine oils that have high rotating bomb oxidation test (RBOT) life. In this study, we examined 18 kinds of commercially produced turbine oils and two kinds of originally prepared oils with amine additives on sludge formation under 120°C dry turbine oil oxidation stability test (TOST) accelerated degradation test. Consequently, we found a criterion to check the quality of sludge resistance of turbine oils based on the relationship between the RBOT residual ratio and weight of filter residues(1μ m pore filter).     

有限元法在透平叶片振动研究中的应用

以透平叶片振动分析理论为基础,对实验室的等截面直叶片分别通过理论法和有限元法求解其前7阶的切向弯曲自振频率并加以比较。利用有限元法对叶片及顶部围带相互连接的叶片组在不同转速下进行模态分析,得到叶片及叶片组动力刚化效应振动模态数值分析结果,并对结果进行了分析比较。对于顶部围带不连接的叶片组,利用有限元法通过构造弹簧模型来处理顶部围带的接触问题,所得结果真实反映了汽轮机运行过程中围带的碰撞和叶片的振动情况。     

Research on ball valve and misaligned guide vane devices to improve the “S” characteristics of a pump turbine

“S”characteristics of a pump turbine may result in certain problems, such as excessive water hammer pressure, unstable no-load operation, and difficulty in synchronization. Accordingly, a new start-up strategy based on the partial opening of a ball valve is proposed, and the calculation model of the hydraulic transition process with misaligned guide vane devices (MGV) and a ball valve is established. The emergency shutdown and turbine start-up conditions are simulated and analyzed. The ball valve can more effectively reduce the maximum inlet pressure of the volute and increase the minimum inlet pressure of the draft tube during the shutdown process compared with the MGV devices. The newly proposed strategy can also effectively reduce the amplitude of pressure fluctuation at the volute and draft tube, shorten the synchronization time, and reduce the speed overshoot during the start-up process. The ball valve can effectively improve the operating quality of the unit in the S-shaped area.

     

江都四站水泵油润滑导轴承及其密封装置的设计

为确保水泵长期、连续、安全、可靠、稳定运行,在借鉴原水泵、立式水轮机导轴承及其密封装置设计经验的基础上,进行了优化设计。经泵站实际运行表明:江都四站改造后水泵导轴承及其密封装置结构合理、运行可靠,安装、运行管理、维修方便,达到预期目标,为类似大型立式水泵采用该型式导轴承和机械密封装置提供了设计参考。     

三菱M701F燃机透平冷却系统典型故障分析及处理

介绍了M701F燃机透平冷却系统技术要求,总结了冷却系统典型故障对机组运行的影响并提出了相应的对策措施。同时,研究了透平冷却空气对燃气轮机的影响机理,对机组的安全运行及维护具有重要借鉴意义。