基于激光吸收光谱天然气脱硫中H2S检测系统研究

H_2S monitoring system in natural gas desulfurization based on laser absorption spectroscopy

硫化氢气体浓度的连续监测是脱硫装置中必不可少的部分。提出了一种基于激光吸收光谱技术的天然气脱硫H_2S测量系统设计方案,为满足现场高灵敏检测的要求,研制了紧凑型多次反射Herriot气体吸收池模块放置在脱硫塔现场,采用单模光纤传输激光和光电探测器信号直接远距离传输至控制室处理的方式,使得系统具有本质安全的特征。系统在胜利油田某集气站脱硫塔进行了现场检测,结果表明,检测下限为300ppb,运行稳定可靠,满足天然气脱硫H_2S检测的需要。

It is essential to monitor continuously the concentration of H2S in the procedure of natural gas desulfurization. The design of monitoring system based on the laser absorption spectroscopy to measure H2S in desulfurization was presented. In order to realize high sensitive measurement, the compact Herriot multi reflection gas absorption cell was developed, which is placed near the desulfurization tower. The detection system is characterized by signal of detector transferred directly to the analysis room. The experiments were carried out in the gas gathering station in Shandong Province. The results show that the detection limit is 300 ppb and the operation is stable and reliable. All the results demonstrate that the system satisfies the demand of monitoring H2S in the procedure of natural gas desulfurization .