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介绍了75t/h旋膜式热力除氧器的结构、工作原理以及设计的技术关键,该产品经实践检验效果良好,延长了锅炉的寿命,节省了投资,得到了用户的一致好评。 相似文献
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分析无除氧器热力系统给水泵的工作条件,对DG500-180型给水泵在国产200MW机组上述热力系统中,热应力能否满足运行要求提出质疑。以ПH-1530-350-1型汽动泵为例介绍了泵壳热应力的计算方法及其人汽蚀特性,得出与汽蚀系数与泵转速,流量关系的数学模型。 相似文献
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目前工业锅炉给水大多采用热力式除氧,但其中相当部分蒸汽会随废气排出,造成能源浪费和环境污染。本文介绍KLAR除氧器乏汽回收技术在珠江啤酒集团公司热电厂成功利用的实例,在我国能源供应形势十分紧张的情况下,KLAR除氧器乏汽回收技术是一种能产生巨大经济效益的节能降耗的新技术。 相似文献
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概述了无除氧器热力系统在国内燃气-蒸汽联合循环电厂中的应用,总结了三大主流燃机技术(MHI/SIEMENS/GE技术)中无除氧器热力系统的技术路线,可为后续工程设计提供借鉴。 相似文献
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针对热力除氧器系统大滞后、大惯性、非线性以及难以建立精确的动态数学模型等特点,本文采用模糊控制算法与传统的PID控制算法相结合,设计了热力除氧器温度控制系统。为了检测所设计的温度控制系统的性能,采用仿真软件MATLAB的模糊工具箱结合Simulink动态仿真分别对模糊PID控制算法和PID控制算法进行了仿真试验。试验结果表明,模糊PID控制系统能较好地满足除氧工艺要求,提高了热力除氧器温度控制系统的精度和工作效率。 相似文献
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设计了磨粉机快辊轴承座的加工工艺和具体的工装夹具.利用卧式加工中心加工磨粉机快辊轴承座,辅以能够高效快速夹紧的夹具,既可以保证加工精度,又能够提高加工效率. 相似文献
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In a recent paper, the Ritz method with simple algebraic polynomials as trial functions was used to obtain an eigenvalue equation for the free vibration of a class of homogeneous solids with cavities. The method presented is here extended to the study of a class of non-homogeneous solids, in which each solid is composed of a number of isotropic layers with different material properties. The Cartesian coordinate system is used to describe the geometry of the solid which is modelled by means of a segment bounded by the yz, zx and xy orthogonal coordinate planes and by two curved surfaces which are defined by fairly general polynomial expressions in the coordinates x, y and z. The surface representing the interface between two material layers in the solid is also described by a polynomial expression in the coordinates x, y and z. In order to demonstrate the accuracy of the approach, natural frequencies are given for both a two- and three-layered spherical shell and for a homogeneous hollow cylinder, as computed using the present approach, and are compared with those obtained using an exact solution. Results are then given for a number of two- and three-layered cylinders and, to demonstrate the versatility of the approach, natural frequencies are given for a five-layered cantilevered beam with a central circular hole as well as for a number of composite solids of more general shape. 相似文献
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本文以某些积算和双笔记录仪产品为例说明由于仪表功能设计的不合理或选型不当,影响了仪表的正常使用,制造厂和用户应关注这类问题。 相似文献
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针对目前市场对工业设计人才的需求,本文论述了我校在工业设计教育方面的改革措施,着重介绍了我校工业设计教育在软件和硬件方面所进行的一系列的改革。 相似文献
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通过分析膨胀套在实际使用产生滑移受阻现象、卡死现象原因的实质,并在分析产生问题原因的基础上提出了改进措施即:增加导向机构。 相似文献
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Polyvinyl pyrrolidone-Iodine complex (PVP-I) molecules were impregnated into the anodic oxide of an aluminum disk specimen. It was rubbed against a silicon nitride ball specimen using a ball-on-disk type friction test rig. Over the limited range of parameters studied (load: 0.2-1.0 N, sliding velocity: 0.6 mm/s, and sliding distance: 1-7 m), the coefficient of friction decreased to a value as low as 0.01 from values of 0.3 to 0.7 for the anodic oxide surface. Single-crystal iodine rubbed against silicon nitride showed a coefficient of friction of 0.1. The low coefficient of friction is attributed to the thin PVP-I film on the relatively hard anodic oxide. The mechanism of coefficient of friction reduction is the same as that of a thin soft film on a hard substrate. 相似文献
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