两种氧化镁添加剂对燃油锅炉防腐特性的试验研究

燃油锅炉运行过程中，往往面临受热面高温腐蚀、受热面积灰、空气预热器及尾部烟道低温腐蚀等问题，合理使用氧化镁添加剂可以有效地解决上述问题。选取了两种燃油添加剂Sunricho-EM330、Sunricho-OM20，分别介绍了其作用机理、特性和使用特点。在燃用高钒、高硫的两台燃重油锅炉上分别添加这两种添加剂，进行对比试验，并确定了添加剂的合理剂量。两种添加剂均可有效防止受热面腐蚀，提高灰的pH值，降低酸露点温度，但长期使用添加剂给锅炉带来更多的灰量，锅炉受热面存在粘污问题。停炉后，对受热面积灰进行取样分析，发现高烟温区段的积灰内层存在黏结性沉积物。在实现燃油锅炉防腐蚀目的同时，Sunricho-OM20的注入量相对更少，粘污情况比较轻微，更具优势。

Experimental Study on Corrosion Resistance of Two Kinds of Magnesium Oxide Fuel Additives Used in Heavy Oil-Fired Boiler

During the operation of oil-fired boiler, some problems occurs frequently such as high temperature corrosion of heating surface, ash deposition on heating surface, low temperature corrosion of air preheater and tail flue, and so on. Reasonable usage of magnesium oxide additive can effectively solve the above problems. Mechanisms, performance and application characteristics of above two kinds of fuel additives, i.e., Sunricho-EM330 and Sunricho-OM20 are introduced. In the heavy-oil fired boiler using fuels with high content of vanadium and sulfur, the two kinds of fuel additives are applied for the comparison test. The proper amount for the fuel additives are determined in test. Both of the additives have effect on anti-corrosion of heating surface, enhancing PH vale, and decreasing the dew point of flue gas. However, long term usage of additives will bring the fouling problem for the boiler as it could bring more ash. Heating surface inspection and ash analysis are performed when boiler is shut down. Sticky deposit is found in the inner layer of ash. To achieve the same target of anti-corrosion, OM20 exhibits more advantages with less amount of OM-20 needed but better performance in fouling.