Steam Reformer Gas Manifold Insulation for Uniform Jacket Temperature
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Solution Overview
Problem
Existing product gas collecting systems for steam reformers face challenges in achieving uniform jacket temperatures due to temperature differences, leading to thermal expansion and distortion, which are costly to address with varying heat transfer coefficients.
Innovation Solution
A product gas manifold system with a concentrically arranged outer jacket and inner tube, filled with insulating materials, and a curved outer surface with a circular or U-shaped profile to manage temperature uniformity and reduce thermal expansion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the insulating layer is designed to maintain jacket tube temperature between 150°C to 200°C, then corrosion prevention and material strength are improved, but uniform temperature distribution around the circumference cannot be achieved due to asymmetric heat exposure
Solution Approach 1:
The patent applies local quality by providing enhanced insulation specifically at the bottom side of the jacket tube where heat exposure is lowest, rather than using uniform insulation throughout. This localized enhancement compensates for the asymmetric heat exposure from the reformer bottom, ensuring uniform temperature distribution while maintaining the jacket tube temperature within the safe 150°C to 200°C range.
Solution Approach 2:
The patent deliberately introduces asymmetry in the insulation design by placing additional insulating material at the bottom side of the jacket tube. This asymmetric insulation configuration counteracts the asymmetric heat exposure pattern, where the upper side receives more heat from radiative emission and port inflows, while the bottom side is exposed only to wind and draft.
2Stability of the object's composition
If varying heat transfer coefficients are used to compensate for asymmetric heat exposure, then temperature uniformity is improved, but manufacturing complexity and cost increase significantly
Solution Approach 1:
Instead of using complex varying heat transfer coefficients throughout the insulation, the patent simplifies the approach by providing enhanced insulation only at the specific location (bottom side) where heat exposure is insufficient. This localized solution achieves temperature uniformity without the complexity and cost of varying heat transfer coefficients across the entire circumference.
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 system achieves a more uniform jacket temperature, reducing thermal expansion and enhancing the lifespan and efficiency of the product gas manifold by withstanding internal and external influences.
Implementation Method 1
the space between the inner tube and the jacket tube being at least partially filled with a first layer of a first insulating material
Implementation Method 2
a second layer of a second insulating material disposed around the jacket tube over at least a portion of its circumference and over at least a portion of its length
Implementation Method 3
the curved outer surface has a circular arc-shaped or U-shaped profile in the radial direction, open in the direction of the reformer furnace
Implementation Method 4
an upper side of the collecting system is exposed to radiative heat emitted by the reformer bottom and in addition receives an inflow of heat via ports of the collecting system connected with hot reformer tubes
Data Source
AI summary
A product gas manifold system for a steam reformer is provided. The product gas manifold system includes a product gas manifold including an outer jacket tube and a gas-conveying inner tube extending concentrically and coaxially over its entire length, a space between the inner and jacket tubes being at least partially filled with a first insulating material, a plurality of nozzle tubes, each for connecting a reformer tube to the product gas manifold, a second insulating material disposed around the jacket tube, a curved outer surface outwardly limiting the second layer of the second insulating material and following the shape of the jacket tube in the axial direction.