基于螺旋线方程的螺旋板换热器螺旋计算方法

提出了一种基于螺旋线方程的、全新的螺旋板换热器螺旋计算方法,给出该算法的计算公式以及公式的导出过程。使用该算法不但可以实现螺旋板换热器板长以及其它螺旋尺寸的精确计算,而且可以方便地实现由螺旋角到板长和由板长到螺旋角的正逆双向计算,具有普遍应用意义。     

多通道螺旋板式换热器几何设计

多通道螺旋板式换热器在设计上与单通道螺旋板式换热器有诸多不同之处。文章将介绍了多通道螺旋板换热器的设计及计算,并着重给出中心隔板、偏心距,有效换热面积、螺旋板圈数、螺旋板内半径、螺旋板起始角、螺旋板长度,螺旋体外径等计算公式。     

板式换热器的特点与优化设计

板式换热器的广泛应用,加速了我国板式换热器行业的迅速发展,但我国板式换热器设计与发达国家之间仍存在着不小的差距。鉴于我国板式换热器在设计方面存在的不足,本文讨论了板式换热器的优化设计方法,分析了如何才能使板式换热器达到最佳的方法。     

螺旋板换热器的外径计算方法探讨

螺旋板换热器的外径等于两螺旋板外侧线终点的极径之和,即DO=r1+r2。此方法不仅适用于半圆螺线的螺旋板换热器,也适用于阿基米德螺线的螺旋板换热器。     

大型板式换热器运行中的主要问题及现场检修

介绍了大型板式换热器在运行中存在的主要问题及原因剖析,重点阐述了进行现场检修的方法和注意事项。     

Heat Exchanger Network synthesis with Detailed Heat Exchanger Design

Pressure drop and fouling are important issues in heat exchanger network synthesis, which are usually neglected. Heat exchangers were designed in detail during the heat exchanger network synthesis, and pressure drop and fouling effects were taken into account. Pinch analysis combined with exergoeconomic analysis was used for determining optimal minimum approach temperature (ΔT_min) for heat exchanger network synthesis. Exergy consumption of heat transfer in HENs was calculated using a subsection integral on balanced composite curves. The heat transfer coefficients of all heat exchangers in the network were calculated iteratively to meet the requirements of optimal area and allowable pressure drops. The proposed method was applied to an industrial case. Numerical results indicate the importance of the detailed design of heat exchangers in HENs synthesis.     

Numerical Study on Plate‐Fin Heat Exchangers with Plain Fins and Serrated Fins at Low Reynolds Number

A simpler numerical model for plate‐fin heat exchangers with plain fins and serrated fins is presented, which incorporates the characteristics of fluid flow and heat transfer. The numerical simulations for heat exchangers with two fins at low Reynolds numbers are carried out by employing the simplified model and using the CFD code FLUENT. The results of heat transfer rate and pressure drop in numerical simulations are compared with the experimental results from the literature. It is shown that the results are in good agreement and the numerical model is reasonable and appropriate. The characteristics of fluid flow and heat transfer are analyzed and compared based on the numerical results. It is concluded that by applying the average heat transfer coefficient in practice, the heat transfer rate of the primary surface is overestimated, and the heat transfer rate and efficiency of the secondary surface are underestimated. The numerical modeling and conclusions provide the method and theoretical basis for the selection, optimization and analysis of plate‐fin heat exchangers.     

螺旋折流板换热器质心当量矩形通用计算模型

现有螺旋折流板换热器(HBHXs)螺旋通道的截面积是按照通道中被管排阻挡的最小截面计算的，而实际的螺旋通道截面是由最小截面和管间的最大截面共同构成的，螺旋流是逐步通过最小截面的。由于按此最小截面公式计算的Reynolds数不准确，因此无法获得预测Nusselt数和摩擦因子与Reynolds数关系的通用关联式。提出了一种新型质心当量矩形(MCER)模型，以更精确地计算螺旋折流板换热器的螺旋通道的截面积和壳侧流体Reynolds数，并采用商用软件HTRI和文献的实验数据对MCER模型进行了验证，获得了较满意的结果。在相同条件下，按MCER模型计算壳侧Nusselt数Nu_o的结果与采用换热器设计软件HTRI所计算结果的误差在-10%~5%范围内，与两组文献实验结果的误差分别在±18%和-5%~15%范围内，但其摩擦因子的公式结果与上述来源结果比较的误差都比较大，需要进一步完善。     

Equation‐oriented simulation and optimization of process flowsheets incorporating detailed spiral‐wound multistream heat exchanger models

Multiple chemical processes rely on multistream heat exchangers (MHEXs) for heat integration, particularly at cryogenic temperatures. Owing to their geometric complexity, the detailed design of MHEXs is typically iterative: the exchanger geometric parameters are selected to match process specifications resulting from a flowsheet optimization step; then, the flowsheet is reoptimized with the predictions of the MHEX model, and these steps are repeated until a convergence criterion is met. This paper presents a novel framework that allows—for the first time, to our knowledge—for the simultaneous optimization of the process flowsheet and the detailed MHEX design. Focusing on spiral‐wound MHEXs, we develop an equation‐oriented exchanger model using industry‐accepted heat transfer and pressure drop correlations for single‐phase and multiphase streams. We embed this model in our previously developed pseudo‐transient equation‐oriented process simulation and optimization framework. We demonstrate our approach on an industrial case study, the PRICO^® natural gas liquefaction process. © 2017 American Institute of Chemical Engineers AIChE J, 63: 3778–3789, 2017     

螺旋板换热器的螺旋计算

本文根据螺旋板换热器螺旋板初始圈的两种形状，提出了两类螺旋计算方法，与目前流行的方法比较，新方法更具系统性和准确性。     

螺旋板换热器几何尺寸的计算方法

半圆螺线和外径计算方法是螺旋板换热器几何尺寸计算的准确和完整的方法,能取代目前使用的各种方法。     

几种新型换热器的特点及使用状况对比

对板式换热器，波纹管换热器和超导热管换热器的特点及使用场合进行了分析，对比。指出只有根据不同的使用场合正确选用换热器，才能取得良好的应用效果。     

Geometric Calculations for the Spiral Heat Exchanger

The present paper deals with the calculation methods for semicircled spirals, from which are derived the geometric calculating formulas for spiral heat exchangers. This series of formulas are characterized by their universality, accuracy, and convenience.     

固定管板换热器换热效率影响因素探讨

通过对不带膨胀节的固定管板换热器换热效率的理论分析,找出影响换热效率的因素,提出了换热器设计时的几点原则,并用实例证明了结论。     

运用SW6进行双管板换热器管板的计算

由于ＳＷ６－９３（ＳＷ６－１９９８）软件包没有双管板换热器管板的计算模块，因此在设计计算时，我们将双管板换热器分成几个单管板换热器进行计算。几年来设计了数十台固定双管板换热器（卧式、立式）和Ｕ形管双管板换热器，下面介绍分解模式。     

阴极液换热器的腐蚀及预防

介绍了电解工序阴极液镍材换热器腐蚀的原因（如自身制造原因．杂散电流及循环水中杂质离子对板式换热器造成的腐蚀）,提出了相应预防措施。     

换热器优选的灰靶决策法

换热器的合理选择对于正常、高效生产具有较为重要的意义。针对备选的固定管板式、螺旋板式和板式三种换热器,采用灰色系统理论中新近出现的灰靶决策理论,通过对换热器指标建立标准模式、灰靶变换和计算靶心度,得出与采用别的方法分析相同的结论,采用灰靶理论可以简便计算分析过程。     

Heizen und Kühlen –- verfahrenstechnische Aspekte

Heating and cooling-chemical engineering aspects. This paper reviews the commonest types of heat exchangers and their applications. They are classified in the following types: tube bundle heat exchangers, plate heat exchangers, spiral heat exchangers, lamella heat exchangers, and heat exchangers for special purposes. Most of these apparatus can be used for heat exchange between single phases or for condensation or boiling of substances. The different criteria determining the choice of heat exchanger are explained.     

错排孔板封头对板翅式换热器流动与换热的影响

在对板翅式换热器内部物流分配研究的基础上,研究了错排孔板型结构封头对板翅式换热器出口流动与换热的影响。通过实验与工业用基本型封头对比,结果表明错排孔板型封头能够明显地改善换热器出口截面流量和温度分布的不均匀性。在Re=2 000时换热器的出口流量分布不均匀度大幅度地下降;而在Re数较大情况下,能更加显著地改善温度分布的不均匀性。     

纵流壳程换热器传热性能研究进展

基于折流杆、整圆形孔板、管束自支撑及空心环支撑等纵流换热器壳程的结构特点,从实验和数值模拟两方面阐述了这些换热器壳程流体流动和传热的研究现状,归纳总结了其传热和阻力性能的计算关联式,对比分析了其适用工况,为纵流换热器的进一步发展和应用提供指导。