材料期刊网

在小规模流化床（FBC）中燃烧一种低S高Cl煤1000h后，对放置于接近沸腾床位置的A210-C碳钢管腐蚀情况进行分析，发瑞碳钢管表面温度为470℃-560℃的区域腐蚀产物（主要为Fe2O3）严重剥落，剥落的腐蚀产物表面覆盖一层沉积盐，部分区域发现有（K，Na）Cl，对残留在钢管表面的腐蚀层进行分析，发现在腐蚀层—碳钢界面或其附近的基体中出现局部氯化，导致形成FeCl2层；局部快速腐蚀，形成向基体一侧的腐蚀突体；形成内部空洞这三种腐蚀形态，并对此现象的产生及Cl2的影响机制进行了详细探讨。

Corrosion of A210-C carbon steel tube has been investigated after 1000h exposure at the place close to the bubbling bed of a bench-scale fluidized-bed combustor during firing a coal of low sulfur and high chlorine. It was foound that a heavily exfoliation of the wastage occurred in locations with the tube surface temperature of 460℃-560℃.The spalled wastage was mainly composed of hematite(Fe2O3) covered by a layer of deposits. (K,Na)Cl was locally detected in the deposits layer. By investigation of the residual wastage on the carbon steel tube,some locations at/near the interface of the wastage and the metal substrate did appear chlorization, which led to three different consequences:(1)formation of FeCl2 layer underneath the eastage,(2)rapid local corrosion,causing protrusions into the metal,(3)appearance of internal pores in the metal. The generation of the different morphologies above and effect of chlorine were both discussed in detail.