螺旋折流板电加热导热油炉的热力设计与程序编制

论文总字数：27803字

摘 要

电加热导热油炉具有高温低压的特点，在工业加热过程中被广泛应用，其中电加热器是其核心部件。目前常用的电加热导热油炉大多存在着体积过大、传热性能低下等诸多不足，而这是由于其核心部件为弓形折流板支撑多层环状U型电加热管管束的电加热器，上述方案致使为达到预定的加热功率，所需电加热管束变多，加热面积变大。

本次毕业设计将三分螺旋折流板换热器技术应用于电加热导热油炉中电加热器的设计，从而完成对电加热导热油炉电加热器高效传热的系列化设计，系列化方案设计采用斜日字单元的Φ12 U型电加热器管，U型电加热器管的数目分别为9、18、27、36、45、54、72、99、108，功率覆盖24kW~720kW。根据传热系数的计算公式，编制了热力计算程序，可对导热油工质不同加热功率，不同工质流量及进、出口温度参数进行选型设计，确定所采用的电加热管数量和长度。螺旋折流板采用折耳和轴向分隔套管方案，折流板的倾斜角全部采用小角度8°，用垂直激光切割下料方法加工。通过编制程序确定螺旋折流板的几何尺寸、拉杆和套管设计。结合实例的电加热导热油炉设计对所编制的程序进行了验证，并绘制出相关图纸。

关键词：三分螺旋折流板电加热器；弓形折流板电加热器；电加热导热油炉；“斜日字”；C

THERMAL DESIGN AND COMPUTATIONAL CODE PROGRAMMING FOR HELICAL BAFFLE ELECTRIC HEATING OIL FURNACE

Abstract

Electric heating oil furnace has high temperature and low pressure features, and is widely used in industrial heating processes, of which the core component is electrical heater. The most commonly used type of electric heating oil furnaces has shortcomings of large volume, low heat transfer performance due to the electric heater adopts segmental baffle to support electric heating U-tube with multi- annular layout. To achieve the desired heating state, such schemes have to increase the number of electric heating U-tubes and with more heating area.

The graduation project design adopted trisection helical baffle heat exchanger technology in the design of electric heater of heating oil furnace, and completed the series design of electric heating oil furnace using Φ12 electric heating U-tube with one-plus-two U-tube unit. The number of electric heating U-tube series design were 9, 18, 27, 36, 45, 54, 72, 99, 108 respectively, and the heating power cover 24kW~720kW. The calculation formula for the heat transfer coefficient were listed and the thermodynamic calculation program were implemented, which can perform the heat transfer design in different heating power, different fluid flow rate and different inlet and outlet temperature parameters, in order to determine the number and length of the electric heating tube. The new approach of folded baffle and axial separation with spacing tube were used, and the inclined angle of the baffles were all of small angle 8° for adopting the vertical laser cutting method for the helical baffle manufacture. By programming the geometry, rod and spacing tube design of helical baffle electric heater can be determined. Verification the compiled program for electric heating oil furnace design was conducted with a certain example, and some drawings were provided.

KEY WORDS: Trisection helical baffled electric heater; segmental electric heater; electric heating oil furnace; one-plus-two U-tube units; C

主要符号表

目 录

摘要 ……………………………………………………………………………………Ⅰ

Abstract …………………………………………………………………………… Ⅱ

主要符号表 ……………………………………………………………………… III

1. 绪论 ………………………………………………………………………1

1.1 引言 …………………………………………………………………1

1.2螺旋折流板电加热器的发展现状 …………………………………………1

1.2.1折流板壳侧流体流动方式比较………………………………………………….2

1.2.2 斜日字三分螺旋折流板电加热器………………………………………………3

1.3软件环境简介 ………….……………………………………………………………3

1.4设计流程和研究内容 ……………………………..……………………………………4

1. “斜日字”三分螺旋折流板电加热导热油炉……………………………5

2.1 U型管管型及“斜日字”方案……….………………………………………………5

2.2“斜日字”布管方案 …………………………………………………………………5

2.3三分螺旋折流板方案 ………………………………………………………………8

2.3.1 周向重叠螺旋折流板…………………………………………………………....8

2.3.2 螺旋折流板折耳方案…………………………………………………………...9

2.3.3 轴向分割方案………………………………………………………………….10

第三章 三分螺旋折流板“斜日字”电加热油炉热力计算 ……………………………12

3.1 三分螺旋折流板电加热器的基本计算 ………………………………………12

3.2定距套管方案…..……………………………………………………15

3.3电加热导热油炉选型 ..………………………………………………………15

3.4 导热油泵选型 ………………………………………………………15

第四章 程序编制过程简介 ……………………………………………………………18

4.1 C 语言简介 ………..……………………………………………18

4.2程序编制界面和参数计算界面 …………………………………18

4. 3 程序操作界面………………………..……………………………………………18

结论 …………………………………………………………………………………21

致谢 …………………………………………………………………………………22

参考文献(References) ……………………………………………………………23

第一章 绪论

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