Methanation Reactor Superheated Steam Cooling
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Solution Overview
Problem
Current methanation reactors face challenges with high manufacturing costs, inefficient heat exchange, and the risk of carbonyl formation due to the use of thermal oils and steam cooling, which limits temperature control and catalyst deactivation.
Innovation Solution
A methanation reactor design incorporating a heat exchanger with superheated steam cooling, where the steam is saturated and regulated by a temperature sensor to control reaction temperature, avoiding carbonyl formation and optimizing heat exchange efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If thermal oil is used for cooling the reactor, then heat exchange efficiency is improved, but the reactor temperature is limited to 380-400°C and manufacturing costs increase
Solution Approach 1:
The patent changes the cooling parameter from thermal oil to superheated steam, which allows operation at higher temperatures (above 400°C) while maintaining efficient heat exchange. The superheated steam can be cooled to condense and then reused, creating a closed cycle that improves both temperature capability and energy efficiency.
Solution Approach 2:
The patent replaces expensive thermal oil with water/steam, which is much cheaper and can be continuously regenerated. The steam is condensed and fed back into the system, creating a sustainable cooling medium that reduces operational costs and eliminates the need for expensive thermal oil handling systems.
2Ease of manufacture
If steam cooling is used in the reactor, then manufacturing costs are reduced, but carbonyl formation occurs when walls are below 260°C
Solution Approach 1:
The patent uses superheated steam instead of saturated steam, which maintains higher temperatures throughout the cooling process. The superheated steam prevents the reactor walls from dropping below 260°C, thereby preventing carbonyl formation while still providing effective cooling. This parameter change resolves the contradiction between cost reduction and harmful byproduct formation.
3Loss of energy
If large heat exchange surfaces are used in fixed bed reactors, then heat removal capability is improved, but manufacturing costs and reactor size increase
Solution Approach 1:
The patent uses steam as a fluid cooling medium that can be circulated through the reactor system. The steam absorbs heat through condensation and phase change, providing high heat removal capability without requiring large heat exchange surfaces. This hydraulic approach is more cost-effective than extending solid heat exchange surfaces.
4Stability of the object's composition
If fluidized bed with immersed heat exchangers is used, then temperature homogenization is improved, but reactor space utilization is reduced and manufacturing costs increase
Solution Approach 1:
The patent uses superheated steam that serves multiple functions: it provides cooling, maintains temperature above 260°C to prevent carbonyl formation, and can be condensed and reused. This multi-functional approach achieves temperature control and homogenization without requiring separate large heat exchanger volumes, thereby optimizing reactor space utilization.
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 controls reaction temperature, prevents carbonyl formation, and allows for efficient heat exchange, reducing manufacturing costs and extending catalyst lifespan.
Implementation Method 1
a heat exchanger (120) passing through the hollow body (105) at least partially and at least partially immersed in the fluidized bed (106)
Implementation Method 2
superheated steam circulating in the heat exchanger (120)
Implementation Method 3
the methanation reaction is highly exothermic, it entails significant needs for heat removal and therefore for cooling the reactor
Implementation Method 4
a means for cooling and saturated steam superheated comprising a water inlet (140)
Data Source
Figure 1
Figure 2
AI summary
The invention relates to a methanation reactor (10) for reacting hydrogen with a carbon-based compound and producing methane, comprising: a hollow body (105) designed to receive a fluidised bed and comprising an inlet (110) for the carbon-based compound; an outlet (115) for methane and water produced by a methanation reaction; a heat exchanger (120) extending at least partially through the hollow body and at least partially submerged in the fluidised bed; and a means (127) for introducing overheated water vapour into the heat exchanger. In certain embodiments, the reactor comprises, downstream of the part of the heat exchanger that extends through the hollow body, a means for cooling the overheated vapour, designed to saturate the overheated vapour.