卧式热虹吸再沸器设计及核算软件开发

在查阅和分析国内外大量的卧式热虹吸再沸器资料的基础上,传承再沸器的各种设计方法,并用具体的工业生产实例进行考核。最终,将编制出通用于各种工艺工况,便于进行卧式热虹吸再沸器设计的软件,为编制开发出统一应用于各种工艺条件下热虹吸再沸器的设计软件包成为可能。     

立式热虹吸再沸器HTRI优化设计

立式热虹吸再沸器是间壁式换热器里计算最为复杂的一类换热器,结合工作实践,在分析工艺流体在再沸器换热管内物理变化过程和间壁换热器传热研究的基础上,利用HTRI软件对立式热虹吸再沸器进行优化设计。     

HTRI设计立式热虹吸再沸器

根据立式热虹吸再沸器的原理,结合工作实践,详细介绍了用HTRI设计立式热虹吸再沸器的方法和设计要点。     

浅析立式热虹吸再沸器热应力及管道设计

立式热虹吸再沸器是利用热介质在壳程提供热量将管侧工艺流体加热沸腾的管壳式换热器。本文介绍了立式热虹吸再沸器的热应力分析及管道设计注意事项;笔者以芳烃分离装置为例,运用CAESARII软件对相关管道及设备管口进行应力分析。     

二硫化碳/硫化氢分离塔再沸器的工程设计

立式热虹吸再沸器是实现液体气化的重要单元设备,在化工行业应用广泛,但其设计较为复杂。二硫化碳/硫化氢分离塔再沸器作为一台重要的换热设备,其运行状况对分离塔的分离效果有较大影响。本文在介绍立式热虹吸再沸器基本工作原理的基础上,利用HTRI软件对二硫化碳/硫化氢分离塔底部的立式热虹吸再沸器进行优化设计。对气化率、安装高度、阻力损失等重要设计参数进行了讨论,以期对其它类似换热器的设计提供参考。     

立式热虹吸再沸器的设计与校核

立式热虹吸再沸器在石化行业中应用十分广泛,但其计算十分复杂。介绍了立式热虹吸再沸器的设计方法,以实例详细介绍了其计算步骤和校核过程,并分析了设计过程中应考虑的一些问题。     

精馏塔釜立式热虹吸再沸器的模拟与优化设计

介绍了立式热虹吸再沸器的操作方式及特点,通过Aspen Plus、Aspen EDR模拟软件,考察了精馏塔釜立式热虹吸再沸器的模拟、设计过程,通过实例分析了塔釜静压头、再沸器结构尺寸、进出口管径等对热虹吸循环稳定性的影响,并得到了优化后的再沸器结构参数。塔釜内的液体静压头与再沸器内两相流密度差产生了热虹吸循环的推动力,设计中应综合考虑并选择合适的静压头,进而确定再沸器的基本结构参数。当推动力大于阻力且循环阻力在再沸器进口、再沸器内、再沸器出口三段管线中分配的比例合适时,才能产生稳定的热虹吸循环。     

精馏塔釜立式热虹吸再沸器的模拟与优化设计

对立式热虹吸再沸器的运行模式和特性进行了简单的描述，利用Aspen Plus、Aspen EDR模拟软件，对精馏塔釜立式热虹吸再沸器的模拟和设计过程进行了研究，研究了塔釜静压头、再沸器结构尺寸、进出口管径等对热虹吸循环稳定性的影响，并获得了最优的再沸器结构参数。再沸过程中，由于塔中的流体静态压力与再沸反应室中两相流场的浓度之比存在差异，在进行再沸反应室的优化时，对再沸反应室中的流体静态压力进行合理选取，以保证再沸反应室的基本结构尺寸，实现较好再沸器循环。     

立式热虹吸再沸器的强化传热

在立式热虹吸再沸器的加热管中插入内管形成新型结构。对新型结构的立式热虹吸再沸器进行了可视化研究和传热性能的实验。探索了该装置内的两相流流型及传热系数、循环速率与热通量的关系。工作介质为水、乙醇、聚丙烯酰胺水溶液和苯乙烯。通过分析和实验袁明,新结构的立式热虹吸再沸器操作稳定,传热系数高,去垢作用强。     

乙烯裂解炉急冷锅炉设计方法的对比

采用文[1]废热锅炉计算方法与文[2]立式热虹吸再沸器的计算方法两种不同的设计手段对乙烯裂解炉双套管急冷锅炉水循环及传热进行计算，从而进行急冷锅炉的工艺设计。对两种方法的计算结果进行了比较。     

盐酸汽提塔再沸器改造

针对盐酸汽提塔管壳式石墨立式热虹吸再沸器在运行中出现的问题,结合圆块孔换热器的特点,应用新型分体式圆块孔石墨再沸器替代原管壳式石墨再沸器。     

Machine Learning Supports Robust Operation of Thermosiphon Reboilers

The analysis of process and equipment operational data in chemical engineering regularly requires a high level of expert knowledge. This work presents a Machine Learning-based approach to evaluate and interpret process data to support robust operation of a thermosiphon reboiler. By applying an outlier detection, potentially interesting and unstable operating conditions can be identified quickly. A multidimensional regression allows to forecast the circulating mass flow. The results obtained fit well into the current state of research and manual evaluation of thermosiphon reboilers.     

Use of Wire Matrix Inserts in Thermosiphon Reboilers in the Lower Operating Range

Turbulators are applied to increase the thermal efficiency of heat transfer units. The additional pressure drop can be challenging for the self-circulation of thermosiphon reboilers. Thus, the effects of hiTRAN®-wire matrix inserts for the boiling of water and a water/glycerol mixture were investigated herein, using the performance of a thermosiphon reboiler with plain tubes as a reference. The reboiler was operated at sub-atmospheric pressures, small driving temperature differences, and under flooded conditions. Favorable and unfavorable operating conditions for using inserts were specified. Especially for the water/glycerol mixture, significant improvements of self-circulation and heat transfer up to six times compared to the plain tube reference were observed, allowing an operation of thermosiphon reboilers at smaller driving temperature differences under sub-atmospheric pressures.     

热虹吸式重沸器循环回路的设计探讨

探讨热虹吸式重沸器循环回路设计,包括热虹吸式重沸器的分类及特点、塔釜结构型式、塔釜液位确定、塔釜至重沸器的降液管及重沸器至塔釜的升气管尺寸计算等。     

Circulation rates of boiling liquids in a vertical tube

An experimental study of heat transfer to boiling liquids under natural convective flow has been carried out in a single tube vertical thermosiphon reboiler to investigate the effect of heat flux and submergence on circulation rates. The test liquids used were distilled water, various concentrations of propan-2-ol in water and their azeotrope. The test section was an electrically heated stainless steel tube of 25.56 mm i.d., 28.85 mm o.d. and 1900 mm long with twenty-one spot welded copper constantan thermocouples to measure the variations in wall temperature along its axis. The uniform heat fluxes in the range of 3.5–42.4 kW/m² were employed while inlet liquid sub-cooling varied from 0.2 to 30.7 °C. The liquid submergence levels were maintained in the range 30–100%. The typical experimental data has been graphically presented and discussed. An empirical correlation has been developed from the experimental data of the present study through regression analysis.     

Development of support vector regression (SVR)-based model for prediction of circulation rate in a vertical tube thermosiphon reboiler

The hydrodynamics and heat transfer in a thermosiphon reboiler interact with each other making the process very complex. Prediction of the rates of heat transfer and thermally induced flow are the primary requirements for the design of thermosiphon reboilers. The objective of this study was to develop, for the first time, a unified data-driven model, for the prediction of circulation rate in a thermosiphon reboiler for different pure components with wide variation in thermo-physical properties and operating parameters, using support vector regression (SVR)-based modeling technique. In the present work, 148 experimental data points from accessible sources, including the author's own study were used. First, a multiple regression (MR) model for circulation rate (in the form of Reynolds number) was developed as a function of dimensionless parameters namely, Peclet number for boiling (Pe_b), Subcooling number (K_sub), and the Lockhart–Martinelli parameter (X_tt), followed by the formulation of an SVR-based model. Statistical analysis revealed that the proposed generalized SVR-based model had high prediction accuracy with an average absolute relative error (AARE) of 3.82%, root mean square error (RMSE) of 0.0717, leave-one-out cross validation (Q²_LOO) of 0.9975 and mean relative error (MRE) of 0.0288 on the training data. Corresponding values of 6.11% AARE, 0.0816 RMSE, 0.9991 leave-one-out cross validation on test data (Q²_ext) and 0.0541 MRE were obtained for the test data. A comparison of the SVR-based correlation was made with the MR model and with some selected empirical correlations in the literature. It was observed that the proposed SVR-based model significantly exhibited an enhanced prediction and generalization performance.     

反应精馏合成醋酸正丁酯的模拟和优化

利用Aspen Plus模拟了合成醋酸正丁酯的反应精馏过程,并分析各工艺参数对产品纯度和再沸器热负荷影响。通过优化得出最佳工艺参数为:理论塔板数为16;精馏段、反应段和提馏段塔板数分别为5、7和4;醋酸和正丁醇的进料塔板数分别为5和7;酸醇进料比为1:1;回流比为1。在此条件下产品醋酸正丁酯的纯度达99.55%;乙酸的转化率达99.71%,再沸器的能耗较低。     

再沸器与精馏塔的工艺设备布置及管路设计

再沸器与精馏塔合用是石油化工企业常用的组合工艺装置,其工艺设备布置及管路设计的优化有利于整个管系和设备的稳定运行。介绍了自然循环式和强制循环式热虹吸再沸器工艺流程;提出了再沸器与精馏塔组合的设备布置要求;简述了再沸器生根在精馏塔上和再沸器安装在单独支架上的2种典型布置方案;探讨了2种典型布置方案的管路设计原则和注意事项...