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首页> 外文期刊>Journal Of The South African Institute Of Mining & Metallurgy >Fluorinated melt-extruded thermoplastic linings in off-gas pipelines of sulphuric acid production plants and in tailor-made equipment for sulphur oxide and sulphuric acid handling
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Fluorinated melt-extruded thermoplastic linings in off-gas pipelines of sulphuric acid production plants and in tailor-made equipment for sulphur oxide and sulphuric acid handling

机译：硫酸生产工厂的废气管道中以及用于氧化硫和硫酸处理的定制设备中的氟化熔融挤出热塑性衬里

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摘要

Gases containing sulphuric acid and sulphur oxide (SO_2, SO_3) can lead to severe corrosion problems, in particular in high concentrations combined with water vapour. If add condensation takes place, this can lead to the extremely destructive dew-point corrosion. In these cases, even materials like titanium and stainless steels can be attacked in the aggressive environments, or suffer variable but significant degrees of material loss by surface degradation.An excellent option for solving the corrosion problems induced by sulphuric add and sulphur oxide is linings made from fluorinated melt-extruded thermoplastics. Those can be divided into partially fluorinated polymers like polyvinylidenefluoride (PVDF) and ethylene-chlorottifluoroethylene (ECTFE), and fuby fluorinated materials like tetrafluoroethyiene-hexafluoropropylene (FEP) and tetrafluoroetliylene-perfluoroalkylvinylether (PFA). The latter have a much higher temperature and chemical resistance than partially fluorinated thermoplastics, but share their outstanding processing properties. Fully fluorinated melt-extruded thermoplastics extend the application range of the lining solutions remarkably. The linings can be installed in sheets, tanks and reactors for liquid sulphuric add, as well as in scrubbers and pipelines for the conversion and transport of sulphur oxide and sulphuric add gases and fumes, including the shut-off valves for flow regulation.An introduction to and comparison of the lining materials and installation methods will be presented, illustrated by means of selected relevant applications. Application ranges for partially and fully fluorinated melt-extruded thermoplastics will be discussed against the background of the chemical compounds and temperatures involved. Case studies of two recently installed and successfully running pipelines in sulphuric add produdng metallurgical plants will be shown in detail. One is a fibre-reinforced plastic (FRP) reinforced FEP liner pipe for off-gases containing droplets of sulphuric add. The other is FEP-lined blast spools made from stainless steel, also installed in gas streams containing sulphuric add. Fabrication methods for transition forms, over-dimensional pipes, and other tailor-made parts will be explained, and relevant quality standards and best practices will be discussed.
机译：含有硫酸和氧化硫（SO_2，SO_3）的气体会导致严重的腐蚀问题，尤其是在高浓度下结合水蒸气。如果发生凝结，会导致极具破坏性的露点腐蚀。在这种情况下，即使是钛和不锈钢等材料也可能会在侵蚀性环境中受到侵蚀，或者由于表面降解而遭受各种程度不同但严重的材料损失。衬里制成的衬里是解决由硫酸和氧化硫引起的腐蚀问题的绝佳选择由氟化熔融挤出的热塑性塑料制成。那些可分为部分氟化的聚合物，例如聚偏二氟乙烯（PVDF）和乙烯-氯代三氟乙烯（ECTFE），以及fuby氟化的材料，例如四氟乙烯-六氟丙烯（FEP）和四氟乙烯-全氟烷基乙烯基醚（PFA）。后者比部分氟化的热塑性塑料具有更高的温度和耐化学性，但具有出色的加工性能。完全氟化的熔融挤出热塑性塑料显着扩展了衬里解决方案的应用范围。衬里可以安装在用于液态含硫添加剂的薄板，储罐和反应器中，也可以安装在洗涤器和管道中，以转化和运输二氧化硫和含硫添加剂的气体和烟气，包括用于流量调节的截止阀。将介绍衬里材料和安装方法并进行比较，并通过选定的相关应用进行说明。将在涉及的化合物和温度的背景下讨论部分氟化和完全氟化的熔融挤出热塑性塑料的应用范围。将详细介绍两个最近在硫酸加工厂生产中安装并成功运行的管道的案例研究。一种是纤维增强塑料（FRP）增强的FEP衬管，用于排放含硫滴的废气。另一个是FEP衬里的高炉线轴，其由不锈钢制成，也安装在含有硫酸的气流中。将解释过渡模板，超尺寸管道和其他定制零件的制造方法，并讨论相关的质量标准和最佳实践。

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