Segmented Pipe Liner Structure for Thermal Elongation in Syngas Lines
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Solution Overview
Problem
In carbon-containing fuel gasification facilities, the thermal elongation difference between the liner and the pipe main body due to high-temperature syngas causes stress, leading to potential deformation and damage, while existing solutions for wear and corrosion resistance are inadequate.
Innovation Solution
A pipe member configuration with tubular liners inserted at intervals inside a tubular outer pipe, where one end is restrained in both axial and circumferential directions and the other end is slidable axially, with a fireproof material filling the gap, to manage thermal elongation and maintain wear and corrosion resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a continuous liner is provided inside the pipe main body, then wear resistance and corrosion resistance are ensured, but thermal elongation difference causes stress leading to deformation and damage
Solution Approach 1:
The continuous liner is divided into multiple segmented liners arranged side by side in the pipe axis direction. Each liner is independently supported by liner holding members, allowing thermal elongation to be managed segmentally rather than as a continuous stress distribution, thereby preventing deformation and damage while maintaining wear and corrosion resistance.
2Strength
If the liner is restrained in the pipe axis direction, then thermal elongation stress is reduced, but assembly and maintenance become difficult
Solution Approach 1:
The liner holding members provide restrained support that allows for controlled movement and adjustment during assembly and maintenance operations. The restraint mechanism is designed to be dynamic rather than completely rigid, enabling liners to be installed and removed while still providing thermal elongation control during operation.
3Strength
If multiple liners are arranged side by side, then thermal elongation is managed, but gaps between liners may cause fluid leakage
Solution Approach 1:
Heat-insulating filling material is placed in the gaps between adjacent liners to prevent fluid leakage. The filling material acts as an intermediary substance that seals the spaces between segmented liners while also providing thermal insulation, thereby managing thermal elongation stress and preventing harmful fluid leakage simultaneously.
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
This configuration effectively suppresses thermal elongation differences, ensuring both wear and corrosion resistance of the pipe main body, preventing deformation and damage, while allowing for easy assembly and handling of the liners.
Implementation Method 1
the raw syngas flowing in the liner has a high temperature of, for example, 400 to 500° C., thereby causing a thermal elongation difference between the liner and the pipe main body
Data Source
AI summary
In order to allow for thermal elongation of a liner, a pipe member, in the interior of which flows a fluid containing solids, is provided with: a tubular outer pipe; a single tubular liner provided inside the outer pipe with a gap therebetween in the radial direction, or a plurality thereof arranged serially in the direction of the pipe axis C; a refractory material filled in between the outer pipe and the liner; a first liner holding member that is provided on an end portion side of the outer pipe, and that holds the liner arranged on the end portion side in a restrained state in the pipe axis C direction and the circumferential direction around the pipe axis C; and a second liner holding member that is provided on an end portion side of the outer pipe, and that holds the liner arranged on the end portion side.