Dump-Cooled Gasifier Liner Expansion and Coolant Flow
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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 with refractory and membrane liners, and thermal growth mismatch issues with regeneratively cooled liners.
Innovation Solution
A dump-cooled gasifier design featuring a liner with an axially and radially expandable aft end, eliminating metal/ceramic joining issues and thermal growth mismatches by suspending the liner freely, and using a coolant to control temperature and form a slag layer for protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If regeneratively cooled liners are used to reduce cost and extend life, then capital cost and availability improve, but thermal growth mismatch between ceramic liner and metal backing structure occurs
Solution Approach 1:
The patent removes the metal backing structure entirely, extracting the source of thermal growth mismatch. The ceramic liner is suspended freely within the gasifier vessel without being attached to any metal support structure, allowing independent thermal expansion without constraint or mismatch.
Solution Approach 2:
The liner system is segmented into independently expandable sections. The liner comprises multiple segments that can expand and contract independently along its length, with expansion joints allowing each segment to accommodate thermal growth separately, preventing stress buildup from mismatched expansion.
2Ease of manufacture
If refractory liners are used, then capital cost is reduced, but availability decreases due to annual replacement requirement
Solution Approach 1:
The patent changes the operating temperature parameter of the liner by implementing a cooling system that maintains the liner temperature below the melting point of slag. This allows the liner to operate continuously without degradation, eliminating the need for annual replacement while using cost-effective refractory materials.
Solution Approach 2:
The liner system uses composite construction combining refractory ceramic materials with a cooling fluid circulation system. This composite approach allows the use of simpler, less expensive refractory materials that would otherwise require frequent replacement, while the cooling system extends their service life significantly.
3Reliability
If membrane liners are used to extend life, then availability improves, but device complexity and cost increase 2 to 3 times
Solution Approach 1:
The patent uses simple, inexpensive refractory ceramic liner materials that can be easily replaced if needed, rather than complex membrane liners. The simplicity of the liner design combined with the cooling system achieves extended life without the 2 to 3 times cost increase associated with membrane liners.
4Strength
If metal/ceramic joining is implemented to attach liner to backing structure, then structural support is provided, but joining complexity and potential failure points increase
Solution Approach 1:
The patent completely removes the metal backing structure and all associated metal/ceramic joining mechanisms. The liner is suspended freely in the gasifier vessel without attachment to any metal support, eliminating joining complexity and potential failure points at metal/ceramic interfaces.
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 dump-cooled gasifier reduces maintenance costs, extends equipment life, and improves availability by managing thermal expansion and eliminating metal/ceramic joining issues, while directly controlling the liner temperature and forming a protective slag layer.
Implementation Method 1
The coolant enters at the head end of the liner, flows through the liner, and is expelled from the aft end of the liner
Implementation Method 2
The coolant enters at the head end of the liner, flows through the liner, and is expelled from the aft end of the liner directly into the vessel
Implementation Method 3
The aft end of the liner is axially and radially expandable with respect to the head end of the liner... as the temperature inside the gasifier increases, the rates of thermal expansion of the ceramic liner and the metal backing structure are mismatched
Implementation Method 4
allowing the temperature of the liner to be directly controlled by the flow rate of the coolant
Data Source
AI summary
A dump-cooled gasifier includes a vessel, a liner, and coolant. The liner has a head end, an aft end, and a plurality of channels extending along a length of the vessel. The aft end of the liner is axially and radially expandable with respect to the head end of the liner. The coolant enters at the head end of the liner, flows through the liner, and is expelled from the aft end of the liner directly into the vessel.