浅述水冷壁管屏厂内预组装制造技术

本文主要阐述了对包括平管屏、螺旋管屏、成排弯管屏在内的水冷壁管屏进行厂内预组装的目的意义、制造难点及解决方案。重点对预组装过程中的减小单屏公差、控制生产环节质量、灵活转换交检尺寸等措施进行了详细的叙述。     

膜式窄节距12Cr1MoVG管屏埋弧焊接试验及手工电弧焊补焊裂纹分析

12Cr1MoVG钢管制成的膜式管屏替代超临界锅炉折烟角SA213-T22管屏水冷壁的试验过程中,发现了埋弧焊角焊缝焊条电弧焊补焊裂纹缺陷.针对这一缺陷展开分析,并找到了缺陷产生的原因,同时提出了解决措施.从而为12Cr1MoVG钢管制成的膜式成排弯管屏应用于超临界锅炉产品奠定了基础,为进一步降低制造成本提出了有意义的探索.     

膜式水冷壁立式成排弯管机设计

膜式水冷壁成排弯管机是锅炉制造的重要设备，文中归纳总结了国内外现有成排弯管机的弯制原理、弯管方式、设备结构、技术参数、机型和各自优缺点，在此基础上提出了适用于螺旋管圈膜式水冷壁成排弯管机的设计措施和有关计算方法，并进行分析比较，图14。     

弯曲半径R=2D_w成排弯膜式壁的制作

介绍在普通膜式壁成排弯机器上弯制带有弯曲半径R=2Dw成排弯的膜式壁的新方法及R=2Dw的成排弯模具结构原理,该方法改变了传统的带有R=2Dw的生产工艺,通过一定的工艺试制与批量生产,证明此方法可以节省大量的人力,并能提高产品质量。     

立式成排弯管机数显表和可编程序控制器(PLC)应用

采用数显表和可编程序控制器（ＰＬＣ）控制的立式成排弯管伙弯制加工膜式管排具有易操作性、 可靠性、直观性和效率高的特点．介绍了立式成排弯管机改进的目的和方法。     

薄壁管成排弯制造工艺技术研究

为满足市场及企业转型要求,我公司决定开发小容量锅炉.该类锅炉所选用的管子往往外径较大、壁厚较薄.成排弯时经常会出现弯瘪、通球不过等现象,给生产带来了较大困难.为解决此问题,通过分析成排弯原理以及设备工作原理,对薄壁管成排弯制造工艺进行了研究.结果表明:管屏弯头两侧加工艺管以及最大限度降低设备夹紧力相结合的方法可以保证薄...     

薄壁管小R成排弯技术

本文通过试验 ,给出了薄壁管小R成排弯的弯曲设备及弯曲模具的设计方案。     

薄壁管小R成排弯技术

本文通过试验,给出了薄壁管小R成排弯的弯曲设备及弯曲模具的设计方案.     

超临界锅炉螺旋水冷壁管屏立式成排弯可行性分析

超临界锅炉中螺旋式水冷壁是比较典型的一种结构,本文主要论述了应用立式成排弯管机弯制螺旋水冷壁的可行性.     

谁问谁

拉灯睡觉：现在的大屏手机太多了,总是听到销售人员说什么电阻屏、电容屏的,还有什么TFT、AMOLED什么的,我只知道电阻屏和电容屏是触摸屏,而TFT、AMOLED之类的就是显示屏,但是这电阻屏和电容屏有啥区别呢？     

螺旋管圈水冷壁的制造工艺

对螺旋管圈水冷壁的制造作了详细的工艺分析,着重探讨螺旋管圈水冷壁的划线、成排弯、过渡段管排的制造、灰斗制造、水冷套的加工、合金钢的焊接工艺,介绍保证螺旋角、过渡段管排的宽度、燃烧器与水冷套的顺利定位穿孔,解决焊接变形和焊接裂缝的方法。     

SANDWICH PANELS WITH INTERLAYER SLIP SUBJECTED TO THERMAL LOADS

Thermally induced bending of sandwich panels composed of three symmetrically arranged layers is studied under the consideration of plane strain. Moderately thick elastic layers made of dissimilar transverse isotropic materials are considered. Analyzing two special cases of interlaminar connections, namely, perfect bond and elastic interlayer slip, a complete analogy between the corresponding initial boundary-value problems is derived. Subsequently, the response of the panel with elastic interlayer slip can be determined directly from the solution of the perfectly bonded sandwich panel with moderately thick faces by substituting effective parameters.     

An investigational back surface cooling approach with different designs of heat‐absorbing pipe for PV/T system

A solar photovoltaic panel accumulates substantial amount of heat, which deteriorates its performance. Thus, to minimize the panel temperature, 3 new designs (semioval serpentine, circular spiral, and circular spiral semiflattened) of absorbers for back surface cooling are introduced in this paper. Experimental investigations on the panel performances with and without the designed cooling systems are performed. A similar experiment with an existing serpentine design of absorbers is also conducted, and the results of all the experiments are compared. The circular spiral semiflattened design absorber has shown preeminent performance among all the absorbers in terms of the highest improvement in efficiency (4.32%), fill factor (19.80%), etc.     

切向燃烧锅炉中屏结构对烟气偏差影响的试验研究

在冷模拟试验台上利用热线风速仪对屏区中气流流动情况进行了详细的测量,分析了分隔屏和后屏在烟气偏差形成中所起的作用,还提出了3个屏结构改进措施并进行了相应的试验,使水平烟道中烟气偏差状况得到了较大改善。图6表2参2     

Application of two-steps perturbation technique to geometrically nonlinear analysis of long FGM cylindrical panels on elastic foundation under thermal load

Present research deals with the geometrically nonlinear bending of a long cylindrical panel made of a through-the-thickness functionally graded material subjected to thermal load. A panel under the action of uniform temperature rise loading is considered. Formulation of the shell is based on the third-order shear deformation shell theory, where the first-order shear deformation and classical shell theory may be extracted as special cases. Thermomechanical properties of the shell are assumed to be temperature dependent and are estimated according to a power law function across the shell thickness. Also, it is assumed that shell is in contact with an elastic foundation which acts in tension as well as in compression. The nonlinear governing equations of the shell are obtained using the von Kármán type of geometrical nonlinearity. The obtained governing equations are solved for two cases, i.e., simply supported shells and clamped shells. The developed equations are solved using a two-step perturbation technique. Accurate closed-form expressions are provided to obtain the mid-span deflection of the shell as a function of temperature elevation. Numerical results are provided to analyze the effects of power law exponent, boundary conditions, temperature dependency, side to radius ratio, and side to thickness ratio.     

A new type of cooling ceiling panel with corrugated surface—Experimental investigation

In this paper a new type of cooling ceiling panel with corrugated surface has been studied experimentally. A heat flux and a heat transfer coefficient for the new type panel were compared with the reference values obtained for a panel of a flat surface. It was shown that increase of the new panel cooling performance results both from increase of its area and from enhancement of natural convection heat transfer. For typical operation conditions, the increase of the new type panel cooling capacity varies from 26 to 55%, in comparison with the reference panel. In addition, the new type panel is more resistant to the risk of dew point and enables the achievement of higher EER values by the heat pump cooperating with it.     

奥氏体不锈钢埋弧焊拼排焊接试验

CFB(循环流化床)锅炉向大容量超临界参数发展是必然趋势,将会采用奥氏体不锈钢膜式管屏。奥氏体不锈钢膜式管屏的拼排工艺已引起业内人员的重视,针对奥氏体不锈钢的特点,采用埋弧焊工艺进行试验。为奥氏体不锈钢埋弧焊拼排选材及焊接工艺提供了依据,为今后更高等级的锅炉管屏埋弧焊焊接打下了基础。