Oxidation Reactor Refractory Lining Thermal Expansion Management
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Solution Overview
Problem
Existing oxidation reactors for partial oxidation of hydrocarbon streams suffer from thermal expansion and contraction issues, which can lead to mechanical tensions and potential damage to the fireproof bricks, compromising the reactor's integrity.
Innovation Solution
The design incorporates a multi-layered fireproof lining with ring-shaped expansion gaps and periodic empty joints to accommodate thermal expansion and contraction, preventing mechanical tensions and maintaining the structural integrity of the fireproof bricks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a continuous fireproof brick lining is used in the oxidation reactor, then the protective function against high temperatures is improved, but thermal expansion and contraction cause mechanical tensions and potential damage to the bricks
Solution Approach 1:
The continuous fireproof brick lining is segmented by introducing ring-shaped expansion gaps at regular intervals along the reactor length. This divides the rigid lining into separate sections that can independently expand and contract thermally, eliminating cumulative mechanical tensions while maintaining protective coverage through periodic segmentation.
Solution Approach 2:
Ring-shaped expansion gaps are extracted from the continuous brick lining structure, creating periodic voids or reduced-density zones. These extracted sections serve as expansion compartments that accommodate thermal dimension changes, preventing stress accumulation in the remaining brick sections while preserving the overall protective function.
2Productivity
If the oxidation reactor operates at high temperatures (1000-1500 °C) for efficient partial oxidation, then the reaction efficiency is improved, but thermal expansion and contraction of fireproof bricks increase, leading to mechanical damage
Solution Approach 1:
The design explicitly incorporates thermal expansion gaps that accommodate the dimensional changes of fireproof bricks under high-temperature operation. By providing predetermined expansion space through ring-shaped gaps, the system allows bricks to expand freely at elevated temperatures without generating damaging compressive stresses, thereby enabling sustained high-temperature operation for efficient partial oxidation.
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 design effectively minimizes mechanical tensions caused by thermal expansion and contraction, ensuring the structural integrity of the fireproof bricks and extending the lifespan of the oxidation reactor.
Implementation Method 1
The design incorporates a multi-layered fireproof lining with ring-shaped expansion gaps and periodic empty joints to accommodate thermal expansion and contraction, preventing mechanical tensions
Data Source
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AI summary
The invention relates to an oxidation reactor for the partial oxidation of a feed stream containing an oxygen oxidant stream to a hydrogen-containing product stream. The partial oxidation can be carried out as non-catalytic partial oxidation (POX) or as autothermal reforming (ATR). Suitable feed streams include hydrocarbon-containing streams as well as streams containing ammonia. According to the invention, the oxidation reactor is provided within the pressure-bearing reactor shell with a protective layer of refractory bricks, wherein the bricks are arranged in the at least one protective layer such that the protective layer is movable in the radial direction during thermal expansion. This effectively prevents or at least minimizes the destruction of the bricks due to thermal expansion.