Gasifier Refractory Coating Slag Resistance
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Solution Overview
Problem
Current gasifier refractory coatings have limited service life due to corrosion from ash and slag, and increasing their thickness reduces the reactor's usable volume and yield.
Innovation Solution
A refractory coating with at least 45% chromium oxide and 20% stabilized zirconium oxide in cubic and/or quadratic form, along with optional dopants like CaO, is applied to the gasifier's interior wall, enhancing resistance to slag infiltration without degrading other functional properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If the thickness of refractory coating is increased to resist corrosion, then the service life is improved, but the usable volume of the gasifier is reduced
Solution Approach 1:
The invention changes the chemical composition parameters of the refractory coating by incorporating chromium oxide (40-70 wt%), zirconium oxide (5-20 wt%), and aluminum oxide (10-30 wt%), along with specific dopants like calcium oxide, magnesium oxide, and rare earth oxides. This compositional parameter change enables the coating to achieve enhanced corrosion resistance at optimal thickness, resolving the contradiction between service life extension and volume preservation.
Solution Approach 2:
The invention uses a composite refractory material system combining multiple oxide components (chromium oxide, zirconium oxide, aluminum oxide) with controlled dopants. This composite structure provides synergistic effects where each component contributes specific properties: chromium oxide for corrosion resistance, zirconium oxide for thermal stability, and dopants for microstructure control, achieving both durability and space efficiency.
2Reliability
If the content of chromium oxide is increased to improve corrosion resistance, then the resistance to slag infiltration is improved, but the manufacturing complexity and cost increase
Solution Approach 1:
The invention optimizes the chromium oxide content within a specific range (40-70 wt%) rather than using excessive amounts, and balances it with other oxide components and dopants. This parameter optimization achieves effective slag infiltration resistance while controlling manufacturing complexity through standardized composition ranges and proven sintering processes.
3Duration of action of stationary object
If the thickness of refractory coating is increased to extend service life, then the durability is improved, but the reactor yield is reduced
Solution Approach 1:
The invention changes the material composition parameters to achieve maximum protection at minimum thickness. By optimizing the ratios of chromium oxide, zirconium oxide, aluminum oxide, and dopants, the coating achieves enhanced durability without requiring excessive thickness, thereby preserving reactor volume and maintaining high yield.
Solution Approach 2:
The composite refractory coating combines multiple oxide systems with complementary properties, creating a material that provides superior protection per unit thickness. This high-performance composite enables thin yet durable coatings that extend service life without sacrificing reactor productivity.
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 significantly increases the service life of gasifier refractory coatings by reducing slag infiltration and thermal shock damage, maintaining performance and reactor efficiency.
Implementation Method 1
The gasifier is coated with various layers of refractory products capable of withstanding the conditions of temperature, pressure and chemical environment to which they are subjected during gasification
Implementation Method 2
the presence of at least 1% zirconium oxide of which at least 20% by weight is stabilized in the cubic and/or quadratic form reduces infiltration and attack by slag
Data Source
AI summary
A gasifier comprising an interior wall on which a layer is applied or an interior wall protected by an assembly of blocks, said layer or said blocks having at least one region of a sintered material containing:i) at least 25% by weight of chromium oxide Cr2O3; andii) at least 1% by weight of zirconium oxide, wherein at least 20% by weight of said zirconium oxide ZrO2 is stabilized in the cubic and/or quadratic form.