Corrosion reduces the lifetime of municipal solid waste incineration (MSWI) superheater tubes more than any other cause. It can be minimized by the careful selection of those materials that are most resistant to corrosion under operating conditions. Since thousands of different materials are already known and many more are developed every year, here the selection methodology developed by Prof. Ashby of the University of Cambridge was used to evaluate the performance of different materials to be used as MSWI superheater tubes. The proposed materials can operate at steam pressures and temperatures over 40 bars and 400ºC, respectively. Two case studies are presented: one makes a balanced selection between mechanical properties and cost per thermal unit; and the other focuses on increasing tube lifetime. The balanced selection showed that AISI 410 martensitic stainless steel (wrought, hard tempered) is the best candidate with a good combination of corrosion resistance, a relatively low price (0.83-0.92 e/kg) and a good thermal conductivity (23-27 W/m K). Meanwhile, Nitronic 50/XM-19 stainless steel is the most promising candidate for longterm selection, as it presents high corrosion resistance with a relatively low price (4.86-5.14 e/kg) compared to Ni-alloys.
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机译：腐蚀比任何其他原因都会大大缩短城市固体废物焚化（MSWI）过热器管的使用寿命。通过仔细选择在工作条件下最耐腐蚀的材料，可以将其最小化。由于已经知道了成千上万种不同的材料，并且每年都会开发出更多的材料，因此，剑桥大学Ashby教授开发的选择方法用于评估用作MSWI过热管的不同材料的性能。提议的材料可以分别在超过40 bar和400ºC的蒸汽压力和温度下运行。提出了两个案例研究：一个在机械性能和每热单位成本之间进行平衡选择；另一个侧重于延长灯管寿命。均衡的选择表明，AISI 410马氏体不锈钢（锻造，硬质回火）具有良好的耐腐蚀性，相对较低的价格（0.83-0.92 e / kg）和良好的导热性（23-27 W）是最佳选择/ m K）。同时，Nitronic 50 / XM-19不锈钢是长期选择的最有希望的候选者，因为与镍合金相比，它具有较高的耐蚀性且价格相对较低（4.86-5.14 e / kg）。
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