胡峻硕 董海兵 曾德宝 王秋燕

摘 要：变压吸附制氧是指采用沸石分子作为吸附剂，利用加压吸附、降压解吸的原理来获取氧气。在一定压力下，空气的氧、氮在分子筛空隙中具有不同的扩散速率，人们可以利用这一现象达到分离空气的目的。本文研究了采用变压吸附方法制备高纯氧的制氧机工艺，并对其自动控制系统进行设计。通过分析自动控制系统的控制逻辑可知，制氧机可以通过西门子公司的可編程逻辑控制器S7300来控制多个阀门，以实现循环制氧。本文对控制系统进行硬件和软件设计，并通过编程软件STEP7的PLCSIM仿真模块与组态软件WINCC6.0进行离线模拟仿真和组态监控。实践证明，该控制方案良好，能达到实际要求。

关键词：制氧机;可编程逻辑控制器;PLCSIM;WINCC6.0;仿真;监控

中图分类号：TF345.05 文献标识码：A 文章编号：1003-5168（2021）09-0018-03

Abstract： Pressure swing adsorption oxygen production refers to the use of zeolite molecules as adsorbents， using the principle of pressure adsorption and decompression desorption to obtain oxygen. Under a certain pressure， the oxygen and nitrogen of the air have different diffusion rates in the molecular sieve voids， people can use this phenomenon to achieve the purpose of separating air. In this paper， the technology of oxygen generator for preparing high-purity oxygen by pressure swing adsorption method was studied， and its automatic control system was designed. By analyzing the control logic of the automatic control system， it can be known that the oxygen generator can control multiple valves through the programmable logic controller S7300 of SIEMENS to realize circulating oxygen. This paper carried on the hardware and software design to the control system， and carried on off-line simulation simulation and configuration monitoring through the PLCSIM simulation module of the programming software STEP7 and the configuration software WINCC6.0. Practice has proved that the control scheme is good and can meet actual requirements.

Keywords： oxygen machine;PLC;PLCSIM;WINCC6.0;simulation;monitoring

自发明以来，变压吸附分离技术被广泛地应用于气体混合物的分离精制，比如，其在制氧机控制系统中就有大量应用。变压吸附制氧系统是以沸石分子筛为吸附剂，利用加压吸附、降压解吸的原理从空气中吸附和释放氧气，从而分离出氧气的自动化设备[1]。沸石分子筛是一种经过特殊的孔型处理工艺加工而成且表面和内部布满微孔的球形颗粒状吸附剂，呈白色。其孔型特性使其能够实现氧、氮的动力学分离。沸石分子筛对氧、氮的分离作用是基于这两种气体的动力学直径的微小差别，氮分子在沸石分子筛的微孔中有较快的扩散速率，氧分子扩散速率较慢。……