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二氧化硫的转化是生产硫酸的过程中的关键步骤。本文以二氧化硫转化为三氧化硫的反应动力学方程为基础，结合固定床反应器模型，将微分方程转化为差分方程，利用Excel对非线性方程的处理功能，计算出反应器的高度，从中可以看出反应器高度与转化率的关系：随着一段反应器转化率从0提高到81%，一段反应器高度由需要3.675m，二段反应器转化率从81%增加到99%，虽然二段反应器转化率仅提高了11%，但反应器高度却需要10.128m。本设计以计算固定床反应器高度为主，并设计固定床反应器的体积、段间换热面积、压降等参数，绘制了反应器的设备图。
关键词催化剂； 绝热固定床；Excel
The conversion of sulfur dioxide is a key step in the process of producing sulfuric acid. Based on the reaction kinetics equation of sulfur dioxide into sulphur trioxide as the foundation, combined with the fixed bed reactor model, the difference equation and differential equation can be converted to use Excel processing functions of nonlinear equation, calculate the height of the reactor, we can find that the reactor height and the conversion relationship: with a reactor conversion rate increased from 0 to 81%, a reactor height by the need to 3.675 m, 2 reactor conversion rate increased from 81% to 99%, while the second section of the reactor conversion only increased by 11%, but the reactor height is 10.128 m. This design is given priority to with height calculation fixed bed reactor, and design the volume of a fixed bed reactor, so the heat exchange between parameters such as area, pressure drop, mapped the reactor equipment.
Keywords Catalyst: adiabatic fixed bed; Excel
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