含硫气田水微正压气提过程分析优化

Process Analysis and Parameter Optimization of Micro-positive Pressure Stripping in Sulfur-containing Gas Field Water

针对含硫气田水正压气提效率低、负压气提设备投资较高且工艺流程较复杂的问题,开展了微正压气提除硫试验。同时采用Aspen Plus软件进行微正压气提过程模拟分析,以气提效率和水处理成本作为评价指标,分析了气水比、塔压、进水pH值、进水流量和进水硫化物含量对气提效果的影响。结果表明,微正压气提在进水pH值为4.5~5.5,塔压30 kPa以下,气水比为6~10条件下,气提效果较好。现场应用表明,优化后微正压气提效率平均为93.15%,比优化前气提效率提高了13.86%,可节约水处理成本约46.11万元/a,为同类含硫气田水处理技术提供一定的参考。

In view of the low stripping efficiency of positive pressure stripping, high equipment investment costs and relatively complicated technology of negative pressure stripping for the sulfur-containing gas field water, micro-positive pressure stripper desulfurization experiments were carried out. With the process simulation and performance analysis using Aspen Plus software, the effect of operation parameters on stripping performances were investigated, using the stripping efficiency and economic performance as evaluation indicators.The ratios of gas to liquid, stripper pressure, the pH of inlet liquid, inlet liquid volume and the sulfide content of inlet liquid influences on the air lift were analyzed. The results showed that the optimized stripping performance can be accessed under the conditions of inlet water pH 4.5-5.5,stripper pressure below 30 kPa and gas to liquid ratio 6-10. The field application showed that the average efficiency of micro-positive stripping pressure was 93.15%after optimization. The stripping efficiency was improved by 13.86%,which can save the annual cost for about 461 100 yuan. The method provided a certain reference for the water treatment process in similar sulfur-containing gas fields.