Multilayered CDR Reactor Reheating Gas to Prevent Coke Deactivation
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Solution Overview
Problem
Conventional carbon dioxide reforming reactors face challenges in maintaining uniform temperature and preventing catalyst deactivation due to coke deposition caused by endothermic reactions, leading to reduced efficiency and stability.
Innovation Solution
A CDR reactor with a multilayered catalyst arrangement, where catalyst layers are spaced apart at predetermined intervals, and a heating means restores reactant gas temperature between layers to maintain optimal reaction conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single catalyst layer is used in the CDR reactor, then the device complexity is reduced, but the temperature uniformity deteriorates due to endothermic reaction causing temperature decrease below appropriate reaction temperature
Solution Approach 1:
The single catalyst layer is divided into multiple catalyst layers (first, second, and third catalyst layers) arranged in sequence along the gas flow direction. Each layer is separated by a porous support structure, creating distinct reaction zones that maintain temperature uniformity through distributed heat management while performing the same CDR function.
2Length of moving object
If catalyst layers are arranged closely together, then the reactor length is reduced, but the temperature restoration capability deteriorates as there is insufficient space for heating between layers
Solution Approach 1:
The reactor design transitions from a one-dimensional linear arrangement to a three-dimensional structure by incorporating a porous support that extends in multiple directions. This allows gas to flow through the porous support in radial directions while catalyst layers are arranged axially, effectively utilizing spatial dimensions to accommodate both compact arrangement and sufficient heating space between layers.
3Productivity
If high reaction temperature is maintained for the endothermic CDR reaction, then the reaction efficiency is improved, but catalyst deactivation occurs due to coke deposition from methane decomposition
Solution Approach 1:
The porous support structure is pre-designed with high thermal conductivity and appropriate porosity to facilitate heat distribution and gas flow before the reaction begins. This preliminary structural arrangement ensures that heat is rapidly distributed to maintain reaction temperature while preventing localized overheating that would cause coke deposition, thus protecting catalyst stability before degradation occurs.
Solution Approach 2:
The porous support acts as an intermediary between the catalyst layers and the heating system. It mediates heat transfer from external heating sources to the catalyst layers while also serving as a flow channel for reactant and product gases. This intermediary structure enables temperature control that maintains reaction efficiency while preventing conditions that lead to catalyst deactivation.
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 reactor maintains a final conversion rate of reactant gas above 90% and prevents catalyst deactivation, ensuring high efficiency and long-term stability by reheating the reactant gas to appropriate temperatures.
Implementation Method 1
CDR reaction for reacting methane (CH4) with carbon dioxide (CO2) to reform the methane into a synthesis gas including carbon monoxide (CO) and hydrogen (H2)... an endothermic reaction between a catalyst and heated reactant gas supplied to the reactor gradually causes the temperature of the reactant gas to decrease
Data Source
AI summary
Proposed is a carbon dioxide reforming (CDR) reactor having a multilayered catalyst layer arrangement for preventing catalyst deactivation, wherein, in the reactor in which a CDR reaction for reacting methane (CH4) with carbon dioxide (CO2) to reform the methane into a synthesis gas including carbon monoxide (CO) and hydrogen (H2) is performed, in order to prevent a case where an endothermic reaction between a catalyst and heated reactant gas supplied to the reactor gradually causes the temperature of the reactant gas to decrease and the catalyst is deactivated by cokes generated due to the decrease in temperature of the reactant gas, CDR catalysts in the reactor are arranged in multiple layers in a multilayered structure to allow the reactant gas temperature that has decreased due to the endothermic reaction to be restored in spaces between the catalyst layers.