锅炉胀接和影响胀接质量的因素

本文概述了锅炉胀接的特点及影响胀接质量的因素。     

锅炉和热交换器胀接结构的可靠性研究

本文针对换热管与管板胀接结构的可靠性.运用弹塑性理论对胀接结构进行了理论上的初步探讨,并应用后退式胀管器做了管子与管板试件的胀接试验.推导了适合液压式胀接和机械式胀接的胀管率的近似理论计算方法.     

FWEC管式空气预热器管子管板胀接工艺

根据FWEC管式空气预热器技术规范对管子—管板胀接的要求,对有缝电阻焊管胀接进行工艺试验。通过试验结果及分析,确定了合理的胀接工艺及参数,满足了技术规范对壁厚减薄的要求并应用于产品制造。同时介绍了产品胀接实际应用情况及经验,并对管板的胀接结构提出改进建议。     

胀接技术在次高压锅炉中的应用探讨和研究

锅炉管束采用胀接连接方式较多,但由于胀接控制不当,造成胀漏水、补胀、超胀现象时有发生。主要介绍胀接的控制要点,同时介绍一台锅炉的胀接工艺性评定试验,并提供了一些数据和经验。     

胀管方法综述

通过介绍胀接的基本原理,对机械胀管,爆炸胀管,橡胶胀管、液压胀管进行了详细的分析,并且对于不同胀管方法的操作方法,胀管器结构、工艺要求,存在问题等方面做了介绍。     

300WM凝汽器不锈钢管胀管工艺改进

本文介绍了不锈钢管胀管工艺试验和ABB规范中胀管率的计算方法,胀接扭矩的选择,并对新旧工艺的胀接试样、胀接顺序、胀接检查等进行对比和分析。     

对用接公式应用的探索

胀接实践中发现,现行规范中的胀接公式难以作为胀接质量的判据。本文拟在探索一种既使规范中的胀管公式具有连续性,又能保证肝接质量的新途径。     

影响锅炉胀接质量的因素及其常见缺陷的处理

介绍了工业锅炉胀接过程中，影响锅炉胀接质量的几个关键因素及其常见缺陷的处理方法。     

对斜接胀管的探讨

通过对斜接胀管的介绍和分析，认为有必要对目前的胀接主要概念进行了探讨，而该胀接形式为胀接新论点－“弹塑性机理”的提出，提供了又一个充分的证据。     

应用液压胀管技术提高高压给水加热器胀管质量

本文对近几年哈锅公司在高压给水加热器产品制造中应用液压胀管技术的试验与实践予以了阐述。并和其他胀接技术-机械胀管做了比较,得出了在目前高压给水加热器产品制造中液压胀管技术优于其他胀接技术的结论。     

确保锅炉胀管质量的工艺方法

确保胀管质量的工艺方法。     

液袋式液压胀管在高压加热器制造中的应用

目前高加胀管的几种方法,着重介绍了液袋式胀管的结构和工作原理,并对液袋式胀管方法和“O”型圈胀管方法进行比较,得出液袋式胀管方法是最经济有效的结论。     

巯基功能化介孔硅的孔径调节及其吸附性能研究

叙述了以F127和CTMABr为模板剂,添加扩孔剂1,3,5三甲苯（TMB）经水热法合成不同孔径的巯基（-SH）修饰的新型介孔吸附剂。指出,以Cu＋2和Pb＋2为处理对象,根据不同孔径的介孔吸附剂对重金属离子的吸附性能,确定扩孔剂TMB投加量为TMB和表面活性剂摩尔比为1.5时,可得到重金属吸附的适用吸附剂的扩孔功能化硅基介孔材料,其BET孔径为6.554 nm,BET孔容为0.6134 cm3/g。     

冷凝器不锈钢管—碳钢管板的胀接

通过对冷凝器不锈钢管－碳钢管板胀接的试验分析，确定了冷凝器不锈钢管－碳钢管板胀接的合理胀接率范围。     

贺西煤矿三采扩区集中回风巷变形分析

贺西煤矿三采扩区集中回风巷因与34k4工作面距离较近,在34k4工作面回采时,三采扩区集中回风巷受采动影响,巷道出现底鼓、片帮等变形,就巷道变形规律进行分析,提出今后应注意和改进的措施。     

螺杆膨胀机在煤气化余热回收中的应用

采用螺杆膨胀机发电技术回收煤气化生产过程中产生的大量余热,通过实例计算分析了该新型发电技术的优越性和市场发展的广阔前景,具有很大的推广价值。     

Measurement of laminar burning speeds and Markstein lengths using a novel methodology

Three different methodologies used for the extraction of laminar information are compared and discussed. Starting from an asymptotic analysis assuming a linear relation between the propagation speed and the stretch acting on the flame front, temporal radius evolutions of spherically expanding laminar flames are postprocessed to obtain laminar burning velocities and Markstein lengths. The first methodology fits the temporal radius evolution with a polynomial function, while the new methodology proposed uses the exact solution of the linear relation linking the flame speed and the stretch as a fit. The last methodology consists in an analytical resolution of the problem. To test the different methodologies, experiments were carried out in a stainless steel combustion chamber with methane/air mixtures at atmospheric pressure and ambient temperature. The equivalence ratio was varied from 0.55 to 1.3. The classical shadowgraph technique was used to detect the reaction zone. The new methodology has proven to be the most robust and provides the most accurate results, while the polynomial methodology induces some errors due to the differentiation process. As original radii are used in the analytical methodology, it is more affected by the experimental radius determination. Finally, laminar burning velocity and Markstein length values determined with the new methodology are compared with results reported in the literature.     

小型风冷热泵节流装置改造的节能研究

对风冷热泵冷热水机组节流装置(热力膨胀阀)进行改进,通过不同试验工况条件下的性能及其各种相关状态参数的测试,比较了系统改进前后的制冷量、能效比和响应时间,验证了使用电子膨胀阀机组能够达到节能的效果,并且提出了改进系统的进一步措施。     

轻质耐火浇注料的研制与应用

根据国内轻质耐火浇注料的组成与性能以及煤气发生炉烟道的实际工作条件,针对烟道内衬实际存在的问题,提出了内衬膨胀珍珠岩轻质耐火浇注料的改进技术要求,并确定了在保证膨胀珍珠岩浇注料保温隔热性能的前提下,提高浇注料的力学性能、抗热震性能和防爆性能的研究内容.通过反复的实验研究,获得了性能优良的膨胀珍珠岩轻质耐火浇注料,并在煤气发生炉烟道上得到成功的应用,取得了大幅度延长烟道内衬使用寿命的效果.     

Role of cellular wavelengths in self-acceleration of lean hydrogen-air expanding flames under turbulent conditions

An investigation is done upon the lean H₂-air flame under turbulent conditions to clarify the role of inherent instabilities and turbulence in self-acceleration of expanding flames. The result shows that, in weak turbulent flow fields, the two-stage self-acceleration feature still exists. As the turbulent intensity increases, the originally evident two-stage “transition-saturation” feature is weakened. When the Karlovitz number becomes greater than 1, the self-acceleration process no longer experiences the transition stage and performs a single-stage feature. These observations are correlated with the distribution and evolution of length scales in the cellular structure of the flamefront. A theoretical analysis is conducted to compare growth rates of disturbances induced by instability and turbulence, with consideration of their wavelength dependence. On this basis, interpretations are proposed on afore-mentioned phenomenal observations and response of quantitative parameters such as fractal excess and average cell wavelength.