Methane Production Reactor Temperature Control
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Solution Overview
Problem
The existing methane production systems face challenges with high initial investment and operating costs due to the need for multiple reactors and auxiliary devices, which also lead to catalyst deactivation and reduced methane conversion rates due to temperature issues during the methanation reaction.
Innovation Solution
A methane production system with a simple configuration that includes a raw material gas supply, catalyst supply, methanation reaction part, temperature measurement and maintenance, and a raw material gas injection system to enhance contact between gases and catalysts, using a heat exchanger to control temperature and prevent hot spots, thereby maintaining catalyst activity and improving methane conversion rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple methanation reaction parts are connected to increase methane conversion rate, then methane conversion rate is improved, but initial investment cost and operating cost increase due to use of multiple reactors and auxiliary devices
Solution Approach 1:
The reactor is divided into multiple reaction zones along the gas flow path, with each zone containing catalyst and having controlled temperature through internal cooling structures. This segmentation allows high methane conversion rate while maintaining a single reactor unit, avoiding the need for multiple separate reactors and their associated auxiliary devices.
Solution Approach 2:
Cooling channels are nested within the reactor structure, with cooling media flowing through internal passages while the methanation reaction occurs in the surrounding catalyst zone. This nested configuration enables temperature control within a single integrated reactor, eliminating the need for separate cooling systems that would increase device complexity.
2Productivity
If methanation reaction temperature increases to improve reaction rate, then methane conversion rate is improved, but catalyst sintering occurs which reduces catalyst activity
Solution Approach 1:
Different zones of the reactor are maintained at different temperatures through selective cooling. The catalyst zones are kept at optimal temperatures for activity while allowing higher temperatures in non-catalytic regions to drive the reaction. This local temperature control prevents catalyst sintering while maintaining high methane conversion rate.
Solution Approach 2:
A cooling medium acts as an intermediary substance that absorbs excess heat from the exothermic methanation reaction. The cooling medium flows through internal channels, absorbing heat and preventing direct thermal feedback to the catalyst, thus preventing sintering while allowing the reaction to proceed at high rates.
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 effectively suppresses hot spots, uniformly controls reactor temperature, maintains catalyst activity, and enhances methane conversion rates, reducing both initial investment and operating costs while improving energy efficiency.
Implementation Method 1
The methanation reaction in which hydrogen and carbon dioxide react to produce methane and water may be performed in a methanation reaction part such as a methanation reactor or the like
Implementation Method 2
a transition metal-based catalyst is used for this methanation reaction
Implementation Method 3
The methanation reaction is an exothermic reaction, and a transition metal-based catalyst is used for this methanation reaction
Implementation Method 4
a heat exchanger connected to the cooling medium supply part and configured to exchange heat between the cooling medium supplied from the cooling medium supply part and the reaction heat generated through the methanation reaction
Implementation Method 5
a cooling medium supply part configured to store and supply a cooling medium, and a heat exchanger connected to the cooling medium supply part and configured to exchange heat between the cooling medium supplied from the cooling medium supply part and the reaction heat generated through the methanation reaction
Implementation Method 6
a raw material gas injection part connected to the raw material gas supply part to receive the raw material gas from the raw material gas supply part and configured to inject the raw material gas into the methanation reaction part at a flow rate higher than a flow rate at which the raw material gas is supplied from the raw material gas supply part
Implementation Method 7
a temperature measurement part connected to the methanation reaction part and configured to measure a temperature of the methanation reaction part
Implementation Method 8
a transition metal-based catalyst is used for this methanation reaction
Implementation Method 9
when the temperature of the methanation reaction part rises to a high temperature of 900° C. or higher by the methanation reaction, the temperature of the methanation reaction part exceeds the temperature that a catalyst can withstand. Therefore, the sintering of the catalyst occurs, which reduces the activity of the catalyst
Data Source
AI summary
A methane production system includes: a raw material gas supply part configured to store and supply a raw material gas; a catalyst supply part configured to store and supply a catalyst; a methanation reaction part connected to the raw material gas supply part and the catalyst supply part and configured to generate a reaction gas by performing a methanation reaction using the raw material gas and the catalyst supplied from the raw material gas supply part and the catalyst supply part; a temperature measurement part connected to the methanation reaction part and configured to measure a temperature of the methanation reaction part; a temperature maintaining part connected to the raw material gas supply part; and a raw material gas injection part connected to the raw material gas supply part to receive the raw material gas from the raw material gas supply part.