After the high parameterization of the boiler in the garbage power plant, the corrosion of the pipe wall intensifies, and enterprises face the urgent problem of how to choose the best protection method according to their own needs. At present, there are many methods for coating corrosion protection of waste incineration boiler pipelines, each with its own advantages and disadvantages. Therefore, it is necessary to establish a scientific and effective evaluation method for various existing corrosion protection technologies to help relevant scientific and technological personnel choose coating protection methods and technologies reasonably. This article designs a total of 13 typical anti-corrosion process schemes currently in use, and selects two types of protection schemes: high cost-effectiveness and high economy. After determining the weight coefficients, a fuzzy comprehensive evaluation method based on Analytic Hierarchy Process was adopted. After constructing a judgment matrix and consistency testing, a comprehensive evaluation technology ranking suitable for high-temperature protection schemes under high parameter conditions was finally formed. This evaluation method is used to select protection schemes, which has significant effects, is simple and convenient, and has strong practicality.
某电厂锅炉水冷壁管发生了爆管.通过失效管道宏观形貌和显微组织观察、管材化学成分和力学性能检测、腐蚀产物成分分析等对该水冷壁管爆管的原因进行了分析.结果表明:爆管位置有明显腐蚀沟槽,局部位置发生了Na元素浓缩,腐蚀产物主要为铁的氧化物(Fe3 O4 和Fe2 O3)、水垢和一定量的NaFeO2;断口无明显塑性变形,宏观形貌表现为脆断特征,微观形貌表现为沿晶断裂特征;爆管位置组织为铁素体+珠光体,组织中有大量沿晶裂纹;锅炉运行期间,锅炉水pH出现过一段时间较高(10.0～10.2)的情况.综合以上分析,确定水冷壁管失效原因为碱腐蚀引起的应力腐蚀开裂.
在对某油田套损井工况调研的基础上,通过采出水成分、腐蚀产物成分等分析,明确了套管内、外腐蚀环境及腐蚀原因.通过化学成分分析及模拟工况环境的腐蚀速率测试评价了在用套管材料的耐蚀性;通过有限元模拟方法计算得到套管内置和外置牺牲阳极在不同环境中的有效保护距离;通过释放率和缓蚀率测试评价了在用固体缓蚀剂的缓蚀性能.最后根据评价结果对防腐蚀措施提出了改进建议.
高压直流输电系统接地极单极大地回路运行时,大量电流入地导致接地极附近地电位升高,接地极附近管道及附属设施可能面临管体腐蚀、管体氢脆、防腐蚀层剥离、设备烧蚀等风险.为监检测高压直流接地极对管道的影响,对国内外相关研究案例进行了调研总结,介绍了多种高压直流干扰监检测方法,对其未来的发展方向进行展望并提出了相关建议.
采用循环神经网络(RNN)对腐蚀探针的监测数据(90%)进行训练,建立了管道腐蚀速率预测模型,并利用剩余的 10%监测数据对模型的有效性进行了验证.结果表明:基于RNN建立的腐蚀速率预测模型能准确地预测出管道的腐蚀速率,预测值与监测数据的均方误差为 0.008%,该方法可以为管道的腐蚀监测提供预警信息.
