李建 崔久涛 何晓昶 夏春晖

摘      要：天然氣净化脱硫脱碳装置胺再生产的酸性气，需要进行达标处理并回收硫磺，硫磺回收可以很好地处理含H2S酸气。对于本装置产生的低浓度酸性气，使用常规的克劳斯工艺难以达到硫回收的技术要求，因此采用直接氧化法。采用流体仿真软件Fluent对反应器进行了流场仿真模拟分析，并对反应时反应器内的温度、压力、流线等参数进行了计算，通过对比分析反应器不同结构下的仿真计算结果，最终确定使用该反应器的结构和参数。针对该厂反应器存在的问题，对该厂的反应器进行了流场仿真，仿真模型涵盖了进气口、触媒反应区域、出气口;根据催化剂参数以及反应数据仿真分析，计算初步算例、反应发生程度以及放热量。利用CFD进行整个流场的仿真分析，寻找理论超温点。通过优化流场以及反应器结构设计，并对整流装置以及触媒筐组件设计，根据流体压强改变反应器局部渗透率，使反应气能平稳的通过反应器间隙及催化剂床层，保证反应气速均匀分布，保证流场条件满足催化剂技术指标。同时通过加装混合格栅，实现反应气浓度在催化剂中均匀分布，保证硫化氢的催化氧化反应均匀进行。并通过混合格栅的优化设计，使反应气温度分布均匀。

关  键  词：硫磺回收;流场仿真;CFD;氧化

中图分类号：TQ051.1+9       文献标识码：       文章编号： 1671-0460（2019）08-1888-06

Abstract： Acid gas from natural gas purification desulphurization and decarbonization plant needs to be treated and sulfur needs to be recovered. Sulphur recovery is beneficial to treating H2S acid gas well. For the low concentration of acid gas produced by this device， it is difficult to meet the technical requirements for sulfur recovery using the conventional Klaus process. Therefore， direct oxidation method is always used. Fluid simulation software Fluent was used to simulate the flow field in the reactor， and the parameters of temperature， pressure and streamline in the reactor were calculated. By comparing and analyzing the simulation results of different structures of the reactor， the structure and parameters of the reactor were finally determined. In view of the problems existing in the reactor， the flow field simulation of the reactor was carried out， including air intake， catalytic reaction area and air outlet. According to the parameters of catalyst and the simulation analysis of reaction data， the preliminary examples， the degree of reaction and the heat discharge were calculated. CFD was used to simulate and analyze the whole flow field， the theoretical hyperthermia point was found. By optimizing the flow field and reactor structure design， and designing the rectifier and the catalyst basket assembly， the local permeability of the reactor was changed according to the fluid pressure， so that the reaction gas passed smoothly through the reactor gap and the catalyst bed to ensure the uniform distribution of the reaction gas speed， and ensure that flow field conditions met the technical specifications of catalyst. At the same time， the reaction gas concentration was evenly distributed in the catalyst by adding mixed grille to ensure that the catalytic oxidation reaction of hydrogen sulfide was carried out evenly. And through the optimization design of the hybrid grid， the temperature distribution of the reaction gas was uniform.

Key words： Sulphur recovery;Flow field simulation;CFD;oxidization

1  概 况

国内某天然气净化厂脱硫脱碳装置胺再生产生的酸性气的脱硫设备开工生产后，出现了反应器局部温度过高、脱硫效率远远低于设计水平，而且尾气中二氧化硫的含量超过国家标准，造成空气污染和硫资源的浪费。……