Gasifier Liner Thermal Expansion Management
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Solution Overview
Problem
Existing gasification technologies face high capital costs and low availability due to complex or short-lived gasifier liner designs, particularly issues with ceramic/metal joining and thermal growth mismatches in regeneratively cooled liners.
Innovation Solution
A gasifier liner with controlled thermal expansion, featuring elongated coolant channels and ceramic sheaths that surround the channels, eliminating the need for metal/ceramic joining and addressing thermal growth mismatches by allowing independent expansion and contraction of the channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If regeneratively cooled liners are used to reduce cost and extend life, then operating cost and lifespan are improved, but thermal growth mismatch between ceramic liner and metal backing structure occurs
Solution Approach 1:
The patent introduces a ceramic matrix composite material as an intermediary between the ceramic liner and metal backing structure. This composite material has thermal expansion properties that bridge the gap between ceramic and metal, eliminating thermal growth mismatch while maintaining the regenerative cooling benefits and extending liner lifespan.
2Strength
If ceramic liners are attached to metal backing structure, then structural support is improved, but ceramic/metal joining complexity and reliability issues increase
Solution Approach 1:
The patent changes the material parameters by using ceramic matrix composite instead of traditional ceramic, which modifies the thermal and mechanical properties to be more compatible with metal backing structures. This parameter change eliminates the need for complex ceramic/metal joining while maintaining structural support and improving reliability.
3Device complexity
If refractory liners are used, then simplicity of design is maintained, but availability decreases due to annual replacement requirements
Solution Approach 1:
The patent employs ceramic matrix composite materials that combine the simplicity of refractory liner design with enhanced performance characteristics. The composite material provides extended service life and improved reliability while maintaining design simplicity, eliminating annual replacement requirements and improving gasifier availability.
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 solution reduces maintenance costs, increases the lifespan of gasifiers, and enhances operational reliability by decoupling thermal expansion differences between ceramic and metal components, thereby improving the availability and efficiency of gasification processes.
Implementation Method 1
the rates of thermal expansion of the ceramic liner and the metal backing structure are mismatched
Data Source
AI summary
A liner for use within a gasifier vessel includes a plurality of elongated channels and a plurality of ceramic sheaths. The elongated channels pass coolant through the gasifier. The ceramic sheaths surround the elongated channels.