Wang Zhiqiang, Lu Xuge, Cheng Xingxing, Ma Chunyuan
National Engineering Laboratory for Coal-fired Pollutants Emission Reduction, Shandong University 17923 Jingshi Road Jinan 250061 PR China
RSC Adv. 2018 Dec 11;8(72):41237-41245. doi: 10.1039/c8ra05705b. eCollection 2018 Dec 7.
In this paper, the low-temperature corrosion characteristics of the four fuel combustions that include methanol, diesel, MF75 (the volume fraction of methanol is 75 ± 2%), and MF50 (the volume fraction of methanol is 50 ± 2%) were studied. MF75 and MF50 were modulated by methanol, diesel and a small amount of cosolvent. The quality indicators of four fuels were judged by the specific standard. The acid dew point temperature of the four kinds of fuel combustion flue gas was calculated and compared, and the acid ion in the condensate of the four fuel combustion products was analyzed and tested. Based on this method, the corrosiveness of four kinds of condensate was determined. The corrosion rates of five metals (brass, 304 stainless steel, 316 stainless steel, corten steel, and Q245 steel) were tested by two different methods (electrochemistry corrosion and static immersion corrosion). The experimental results show that the quality indicators of four fuels have all reached the relevant national standards. The dew point temperature of methanol, MF75 and MF50 are lower than that of diesel. The corrosion products on the surface of corten steel are relatively compact and easily accumulate dust, which is not conducive to the safe operation of the boiler. The corrosion resistance properties of 316 stainless steel is excellent, showing that it would be the ideal material choice for the low-temperature zone of a boiler flue.
本文研究了甲醇、柴油、MF75（甲醇体积分数为75±2%）和MF50（甲醇体积分数为50±2%）这四种燃料燃烧的低温腐蚀特性。MF75和MF50由甲醇、柴油和少量助溶剂调制而成。四种燃料的质量指标按照特定标准进行判定。计算并比较了四种燃料燃烧烟气的酸露点温度，对四种燃料燃烧产物冷凝液中的酸离子进行了分析测试。基于此方法，确定了四种冷凝液的腐蚀性。通过电化学腐蚀和静态浸泡腐蚀两种不同方法测试了黄铜、304不锈钢、316不锈钢、耐候钢和Q245钢这五种金属的腐蚀速率。实验结果表明，四种燃料的质量指标均达到相关国家标准。甲醇、MF75和MF50的露点温度低于柴油。耐候钢表面的腐蚀产物相对致密，易积灰，不利于锅炉的安全运行。316不锈钢的耐腐蚀性能优异，表明它是锅炉烟道低温区的理想选材。
