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论述了旧煤气管线改作输送天然气管线前,清除管线内壁焦油类沉积物及锈蚀产物的必要性,通过测定碳钢在四氢噻吩(THT)-石油醚溶液中的腐蚀性能,揭示残存的焦油能吸收添加在天然气中的THT,造成THT在管线输送过程中的额外损耗,并与此同时对送气管线构成一定的腐蚀.采用腐蚀挂片试验与XPS表面成分分析发现,在锈蚀的碳钢表面总伴有大量的含硫化合物吸附富集,吸附与锈蚀共存,二者是相互促进的关系.碳钢管线内壁发生腐蚀,也会引起THT的额外消耗,对清除旧煤气管线内壁的焦油和铁锈,提出了建议.
The necessity of removing the tar deposits and rust products on the inner wall of the pipeline before the old gas pipeline was changed to transport the natural gas pipeline was discussed. The corrosion performance of carbon steel in THT-petroleum ether solution was revealed to reveal the residual tar energy Absorption of THT added in natural gas, resulting in THT pipeline in the pipeline during additional loss, and at the same time on the gas pipeline to form a certain degree of corrosion.Using the corrosion coupon test and XPS surface composition analysis found that the surface of the total corrosion of carbon steel Accompanied by a large number of sulfur compounds adsorption enrichment, coexistence of adsorption and corrosion, the two are mutually reinforcing relationship.The corrosion of the inner wall of carbon steel pipe will also cause additional THT consumption, to clear the old gas pipeline wall tar and rust, give suggestions.