High-Temperature Anti-Corrosion Design Strategy of Boiler Flue of Waste Incineration Power Station Based on the Principle of Equal Life

Abstract

In view of the urgent need for high-temperature corrosion prevention in high-parameter waste incineration power stations at home and abroad, a refined strategy and plan for high-temperature corrosion protection of flue were devised using the equal life design principle according to the change law of the actual temperature of each flue in the waste boiler and the corrosion rate of the pipeline. For instance, composite induction fusion welding coatings were applied to the mid and lower sections of the first flue’s water-cooled wall; the upper and ceiling portions of the first flue were welded with Inconel625; composite induction fusion welding techniques were used for the second flue’s water-cooled wall; the third flue’s water-cooled wall was treated using induction fusion welding; the high-temperature superheater in the horizontal flue adopted a composite induction fusion welding process; induction fusion welding was the chosen method for the medium and low-temperature superheaters. For the economizer, the use of high-temperature ceramic coatings was recommended. The refined anti-corrosion strategies of the flue according to the principle of equal life design could greatly reduce the one-time investment of the enterprise and bring significant economic benefits.

Keywords

• waste incineration power station|equal life design|boiler four-tube|surfacing welding|composite induction fusion welding process|ceramic coating|fine anti-corrosion