Yankee Drier Internal Coating for Steam Corrosion Resistance
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Solution Overview
Problem
Steel Yankee driers are prone to corrosion due to deviations in steam quality, especially in paper mills that do not control steam production, leading to oxide formation, reduced thickness, and obstruction of condensate collecting tubes, affecting drying efficiency and paper quality.
Innovation Solution
A protective coating with high adhesion, low porosity, ductility, and high thermal conductivity is applied to the internal surface of the Yankee drier, using high phosphorus nickel plating to resist corrosion and maintain heat transfer efficiency, with a thickness of less than 200 microns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If steel is used for the Yankee drier mantle, then heat transfer efficiency is improved and manufacturing flexibility is increased, but corrosion resistance deteriorates compared to cast iron
Solution Approach 1:
The patent applies a protective coating layer on the internal surface of the steel mantle, creating a composite structure that combines the high thermal conductivity of steel with the corrosion resistance of the coating material, thus resolving the contradiction between heat transfer efficiency and corrosion resistance
Solution Approach 2:
The patent modifies the chemical composition parameters of the steel mantle by controlling the content of alloying elements such as chromium, nickel, and molybdenum to enhance corrosion resistance while maintaining the thermal conductivity advantages of steel
2Adaptability or versatility
If steam quality is not严格控制, then operational flexibility is improved, but oxide formation increases leading to reduced thickness and corrosion
Solution Approach 1:
The patent applies a protective coating on the internal surface of the steel mantle before operation, which acts as a buffer against oxidative corrosion from poor quality steam, allowing operational flexibility without the harmful effects of oxide formation
Solution Approach 2:
The protective coating serves as a sacrificial layer that protects the expensive steel mantle from corrosion, absorbing the harmful effects of poor steam quality while maintaining the longevity of the main structure
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The coating effectively prevents corrosion and erosion, maintaining thermal efficiency and reducing the risk of wet bands in paper, while minimizing material and energy costs by optimizing the coating process for large components.
Implementation Method 1
high phosphorus nickel plating
Implementation Method 2
high thermal conductivity
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
Yankee drier comprising a cylindrical mantle (15) to which two end heads (13, 14) are connected, on each of which a corresponding pin (2, 6) is arranged, wherein the cylindrical mantle (15) has an external surface and an internal surface, and wherein the internal surface of the mantle (15) in cooperation with the lateral heads (12, 13) delimits an internal chamber of the Yankee drier in which steam can be introduced. The internal surface of the mantle (15) is at least partially provided with a surface protective coating, the surface protective coating protecting the internal surface of the mantle from corrosive and/or abrasive agents contained in the steam introduced into said chamber.