Methanation Reactor Mode Switching for Catalyst Protection
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Solution Overview
Problem
Catalytic methanation reactors face stress and catalyst degradation due to continuous operation and frequent shutdowns for maintenance, leading to reduced lifespan and inefficiency.
Innovation Solution
Implementing a flexible operating mode that allows a methane-rich gas stream to flow with reduced material conversion, enabling quick switching between operational modes, minimizing catalyst stress, and using recirculation to maintain reactor temperature and reduce energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the reactor operates continuously at high utilization, then productivity is maintained, but catalyst stress and degradation increase
Solution Approach 1:
The patent implements periodic switching between a first operating mode (high material conversion, high productivity) and a second operating mode (low or negligible material conversion, catalyst protection). This periodic operation allows the reactor to maintain high utilization when needed while periodically reducing load to protect the catalyst, resolving the contradiction between continuous high productivity and catalyst lifespan
Solution Approach 2:
The system dynamically switches between different operating modes based on process requirements. The reactor can quickly transition from the first mode (high conversion) to the second mode (low conversion) and back, allowing flexible adaptation between productivity demands and catalyst protection needs, rather than operating statically at fixed utilization levels
2Ease of repair
If the reactor is shut down frequently for maintenance, then catalyst replacement is enabled, but productivity and operational continuity decrease
Solution Approach 1:
The second operating mode serves as a preliminary protective action that extends catalyst life by reducing stress during periods when high productivity is not required. This preliminary protection delays the need for catalyst replacement, thereby maintaining operational continuity and reducing the frequency of shutdowns for maintenance
Solution Approach 2:
The reactor maintains continuous operation by switching between two useful modes: the first mode for high productivity and the second mode for catalyst protection. This eliminates the need for complete shutdowns, as the second mode keeps the reactor operational while performing the useful function of protecting the catalyst, thus maintaining operational continuity
3Adaptability or versatility
If rapid changes in pressure and temperature are made, then operational flexibility increases, but catalyst damage risk increases
Solution Approach 1:
The system provides operational flexibility through dynamic switching between operating modes while managing the transition rates. The switch between first and second modes can be performed quickly when needed, but the patent acknowledges and accounts for the catalyst's sensitivity by controlling the rate of parameter changes during transitions, thus achieving flexibility without causing damage
4Use of energy by moving object
If the reactor operates in standstill mode, then energy consumption is reduced, but rapid restart capability must be maintained
Solution Approach 1:
The second operating mode functions as a standstill or low-activity periodic state where the reactor consumes minimal energy but remains operational. This periodic standstill mode allows energy reduction while maintaining the capability for rapid restart by keeping the reactor system intact and ready, rather than requiring full shutdown and restart procedures
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
Extends catalyst lifespan, reduces energy costs, and allows for flexible operation with frequent load changes without damaging the catalyst, enabling intermittent operation without the need for complete shutdowns.
Implementation Method 1
a starting gas containing carbon dioxide and hydrogen is methanated catalytically along a flow path of the reactor with a first conversion of material to form a methane-rich product gas
Implementation Method 2
the circulating methane-rich gas flow brings about heat equalization between different locations along the flow path and/or circulation path
Implementation Method 3
CO + H2O ↔ CO2 + H2, the so-called water-gas shift reaction
Implementation Method 4
CO + 3 H2 CH4 + H2O, the CO methanation
Implementation Method 5
CO2 + 4 H2 ↔ CH4 + 2 H2O, which limits CO2 methanation
Data Source
AI summary
Operating a methanization reactor, comprises methanizing a reactant gas containing carbon dioxide and hydrogen in a first operating mode, along a flow path of the reactor with a first catalytic conversion rate to produce a methane-rich product gas (2), and guiding a methane-rich gas stream at least at the beginning of the flow path in a second operating mode with a lower or negligible second conversion rate. Independent claims are also included for: (1) methanization reactor, preferably for carrying out the above method, comprising (i) a first supply device (10) for reactant gas containing carbon dioxide and hydrogen, at the flow path of the reactor, along which a catalyst is arranged, (ii) a dispenser for dispensing the methane-rich product gas along the flow path produced by the catalytic methanation of the feed gas, (iii) a control device (30), and (iv) a second supply device for supplying the methane-rich gas mixture to the beginning of the flow path, where the control device is switched between the first operating mode, where the product gas is produced in the first conversion rate, and the second operating mode, where the methane-rich gas stream flows at least at the beginning of the flow path with the lower or negligible conversion rate; and (2) an assembly of the methanization reactor, and an electrolyzer (20) for electrolytic production of hydrogen for the reactant gas.