天然气集输管道微生物腐蚀规律及腐蚀速率模型

Microbiological Corrosion Law and Corrosion Rate Model of Natural Gas Gathering and Transportation Pipeline

为了研究硫酸盐还原菌(SRB)对天然气集输管道腐蚀行为的影响,通过浸泡试验,研究了常压和高压条件下不同SRB含量时5种钢材的腐蚀速率及其耐SRB腐蚀性能。依据试验结果建立了微生物腐蚀速率预测模型,并利用PIPSIM软件模拟管道温度和压力变化对模型进行了修正。结果表明:在常压和高压环境中,钢材的腐蚀速率均随着SRB含量的增加而增大,其中N80钢的耐SRB腐蚀能力最强;根据预测模型计算的腐蚀速率与实际腐蚀速率存在0.06~0.07 mm/a的误差,修正后的模型能够更好地预测管道微生物腐蚀速率。

In order to investigate the effect of sulfate-reducing bacteria(SRB) on the corrosion behavior of natural gas gathering and transportation pipelines, the corrosion rate of five steel materials at different SRB concentrations and their anti-bacterial corrosion performance under normal-pressure and high-pressure conditions were studied in immersion test. A prediction model of microbial corrosion rate was established based on the experimental results. PIPSIM software was used to simulate the changes of pipeline temperature and pressure to modify the model. The results show that in both normal-pressure and high-pressure environments, the corrosion rates of five steel materials increased with the increase of SRB concentration. N80 steel had the strongest resistance to SRB corrosion. There was an error of 0.06-0.07 mm/a between the corrosion rates calculated by the prediction model and the actual corrosion rates. The modified model could better predict the pipeline microbial corrosion rate.