氧化皮生成与等离子体煤粉点火锅炉启动的关系

电厂锅炉高温段受热面管内氧化皮的生成和脱落已经成为影响机组安全运行的世界性的问题之一,很多人认为使用等离子体煤粉燃烧器启动会促使氧化皮的生成和脱落。事实上,氧化皮的生成、脱落确实与启、停速率有关。从锅炉的启停方式、初始投入功率和后续输入功率的速率、运行调整等方面进行详细的阐述和分析。从数百台安装等离子体煤粉燃烧器锅炉的启停经验来看,特别是超（超）临界机组,在锅炉启动过程中,只要满足锅炉的升温升压曲线,适当调整初始投入功率和后续投入功率的速率以及运行方面的调整,就不会加速锅炉高温受热面管内氧化皮的生成和脱落。

Correlation Between Oxide Skin Formation and Plasma Ignition Boiler Startup

The formation and exfoliation of oxide skin on the high temperature heating surfaces have become a worldwide problem that may threaten the secure operation of electric power generating units. It is widely agreed that the formation and exfoliation of oxide skin may be accelerated by the plasma igniter for boiler startup. In fact, the oxide skin formation and exfoliation are indeed related to the startup and shutdown rates of the boilers. In this paper, the detailed analysis on this problem is conducted from the aspects of boiler startup and shutdown methods, the initial and succeeding loading rates and operational adjustment. Based on the experience on hundreds of boilers that are equipped with plasma igniter in pulverized coal burners, especially in supercritical and ultra supercritical units, if the startup process satisfies the temperature and pressure rising curves and the initial and succeeding loading rates as well as the operation style are appropriate, the formation and exfoliation of oxide skin in the tubes of high temperature heating surfaces will not be accelerated.