共查询到18条相似文献,搜索用时 168 毫秒
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结合我国目前的小氮肥企业所面临的技术挖潜改造来增加效益的具体情况,分析了6 MW汽轮机在驱动往复式压缩机方面的具体应用和机组配套方式。 相似文献
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介绍了驱动往复式压缩机用单支撑电机轴系挠度和临界转速的相关计算,并给出了计算实例,同时对轴的强度计算做了简要介绍。由于该电动机的负载特性决定了在轴系设计时要综合考虑刚度和强度,同时应与压缩机轴系共同做扭振分析,保证整个轴系固有扭振频率避开强制振荡频率,避免发生共振,以确保电机运行可靠性,提高机组系统安全。 相似文献
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以小型往复式制冷压缩机为典型研究对象,通过对其封闭壳体的振动分析,指出了壳体振动的基频即为电机的转速。提出了一种基于微机的通过测量振动基频来间接测量封闭体内电机转速的方法和构成。 相似文献
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往复式压缩机作为冰箱的心脏部件,其在工作时候的负载情况对压缩机的性能分析具有指导意义,同时也影响到压缩机电机的负载点设计,使压缩机性能达到最优,冰箱系统实现节能的目的。 相似文献
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E. K. Arakelyan A. V. Andryushin S. Yu. Burtsev K. A. Andryushin 《Thermal Engineering》2018,65(12):900-910
Technical viability and economic feasibility of improving the technology of a 450-MW CCGT unit’s participation in power load leveling of the power system operating in a GTU based CHP mode by transferring a 450-MW CCGT T-125/150 steam turbine to the driving mode instead of its shutdown are considered. It is shown that the shutdown of the steam turbine is associated with increased fuel consumption under start-up conditions, delayed steam turbine loading and the CCGT unit as a whole, and a loss of steam turbine life characteristics. The technology of transferring the 450-MW CCGT unit to the GTU based CHP mode, possible schemes of high- and low-pressure steam distributions between line water heaters, and methods and results of calculation of power parameters of the 450-MW CCGT unit with the turbine shutdown and transferring it to the driving mode in the absence and presence of peak-load heaters in the heat balance are presented. It is shown that switching the 450-MW CCGT unit from the base 290 MW electric load and 1006 GJ/h heat production to the GTU based CHP mode leads to a decrease in electric capacity of the CCGT unit by 90 MW and an increase in heat production by 335–348 GJ/h. Comparative graphs of the steam turbine start-up and the CCGT unit rated loading in the comparable variants after its operation in the GTU based CHP mode for 8–10 h are given. Evaluation techniques and results of the economic efficiency of the generator driving mode are compared with the shutdown of the steam turbine. Based on the performed calculations, it is shown that, for various combinations of fuel equivalent and electricity costs and heating tariffs, the expedient time for switching the steam turbine to the driving mode is 10–18 h. Additional advantages of the driving mode are noted, such as improvement of the steam turbine reliability due to the elimination of cyclic temperature variations of its steam-inlet elements and vibrational oscillations in the final stages of the low-pressure cylinder and the possibility of the steam turbine generator to operate as a synchronous condenser. 相似文献
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给水泵汽轮机速关阀的分析和改造 总被引:1,自引:0,他引:1
将使用低压透平油的液压调节系统改为使用高压抗燃油的纯电调系统可以提高控制品质,是汽轮机控制技术发展的趋势。通过对给水泵汽轮机速关阀的结构和工作原理的分析,论述了速关阀改造的必要性和可行性;并对主要部件进行了设计计算,完成了速关阀改造的设计方案。 相似文献
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Lawrence R.G. Finney D. Davidson D.F. 《Industry Applications, IEEE Transactions on》1988,24(4):620-627
A power electronic converter is applied to control the speed of a 5 kV motor. The motor is directly coupled to a 6500 r.p.m. compressor and replaces a steam turbine. Dual converters are used in a twelve-pulse arrangement at both the utility and the motor. The motor is of solid rotor construction, with dual 30° displaced stator windings. Finite-element analysis is used to optimize the motor design for use with a variable-frequency static converter. Full-power tests are completed which confirm theoretical predictions on losses, performance, and operation. The electrical drive takes up considerably less space and is much more efficient than the steam turbine it replaces 相似文献
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设计一种新型直线压缩机驱动用永磁往复直线电动机的控制系统。通过分析直线压缩机的谐振工作特性和动圈式直线电动机的运行特点,在获得直线电动机样机的空载谐振的基础上,采用电机专用控制芯片TMS320LF2407设计了控制系统,完成了压缩机行程采样周期和采样数组的算法。并采用VB6编写了具有良好人机界面的上位机控制程序,解决了新型直线压缩机驱动用直线电动机的控制问题。 相似文献
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以漳泽发电分公司5号汽轮机在运行中2号轴承发生间断性振动波动现象为例,经测试分析诊断为汽轮机2号轴承油挡碰摩所致,检修中发现油挡内环融化导致碳化物积聚,经更换油挡处理后机组振动正常。 相似文献
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伊敏电厂前苏制1号500MW超临界汽轮机组在试运期间,1号汽动给水泵的小汽轮机4号轴承出现剧烈振动。经过对多次试验所测得的数据进行分析,确认1号小汽轮机发生了油膜振荡。采取了相应处理措施,保证了小汽轮机正常运行。 相似文献