Plasma Methanation System with Fluidized Bed Heat Moderation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current gasification systems using plasma torches for energy have short catalyst lifetimes due to extreme temperatures, leading to high maintenance costs and inefficiencies in converting carbonaceous materials into methane.
Innovation Solution
A methanation system with a gasifier having an internal volume divided into sections, utilizing steam-fed fluidized bed gasification and microwave-induced plasma systems for efficient syngas production, followed by a methanation unit with cooling units for heat reuse and efficient methane production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If plasma torches are used to heat the catalytic bed for gasification, then thermal energy transfer efficiency is improved, but catalyst lifetime deteriorates due to extreme temperatures
Solution Approach 1:
A fluidized bed of inert particles (sand, gravel, or ceramic beads) is introduced as an intermediary medium between the plasma torch and the catalytic particles. The plasma torch heats the fluidized bed, which then transfers thermal energy to the catalytic particles through mixing and contact, preventing direct exposure to extreme plasma temperatures while maintaining effective heat transfer for gasification and methanation reactions
Solution Approach 2:
The invention changes the temperature parameter distribution by using the fluidized bed to moderate and distribute heat more uniformly. Instead of localized extreme temperatures from direct plasma contact, the fluidized bed creates a more homogeneous temperature field that maintains reaction efficiency while protecting catalyst particles from thermal degradation
2Productivity
If short-lived catalysts are used in plasma gasification, then initial methanation efficiency is maintained, but maintenance costs and system downtime increase
Solution Approach 1:
The fluidized bed acts as a protective intermediary that shields catalyst particles from direct plasma exposure, creating a more benign thermal environment that extends catalyst operational life while maintaining the temperature conditions necessary for efficient methanation reactions
Solution Approach 2:
The fluidized bed provides beforehand cushioning by absorbing and moderating extreme plasma energy before it reaches the catalyst particles, preventing thermal shock and gradual degradation that would otherwise require frequent catalyst replacement and system shutdowns
3Quantity of substance
If complete cooling of syngas is performed before methanation, then condensation of water is achieved, but energy efficiency deteriorates due to heat loss
Solution Approach 1:
Instead of discarding the heat energy removed during syngas cooling, the invention recovers this thermal energy by using it to preheat the feedstock or process water before it enters the gasifier, converting what would be a loss into a useful heating function that improves overall system energy efficiency
Solution Approach 2:
The cooling process is integrated with the heating process to create a continuous thermal cycle where heat removed from syngas during cooling is immediately put to useful effect in preheating incoming materials, eliminating idle heat loss and maintaining continuous productive action throughout the system
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 achieves high yields of clean syngas and efficient methane conversion with extended catalyst life, reducing maintenance and energy costs by reusing heat for steam generation.
Implementation Method 1
at least one plasma system (8) configured inside the upper section (5) so that gas that leaves the gasifier (1) via the gas outlet (16) passes through a zone heated by said at least one plasma system (8)
Implementation Method 2
a bed material comprising catalytic particles (9) inside the middle section (6) and/or lower section (7) and connected to at least one gas inlet (12) to fluidize the bed material
Implementation Method 3
a first cooling unit (18, 29), comprising a hot gas inlet (19) and a cold gas outlet (20), wherein said hot gas inlet (19) is fluidly connected to the gas outlet (16) of said gasifier (1)
Implementation Method 4
said first cooling unit and said second cooling unit independently comprise an economizer, an evaporator and/or a super-heater for steam production for the gasifier
Implementation Method 5
a methanation unit (21), suitable to produce crude methane from syngas
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The present invention provides a methanation system (36) for the conversion of carbonaceous material into methane, comprising: - a gasifier (1) for gasifying carbonaceous material into syngas, said gasifier being at least partially steam fed and comprising: - an internal volume (4) comprising an upper section (5), a middle section (6) and a lower section (7), and optionally a first connecting section (10), connecting said upper section (5) and said middle section (6) and/or a second connecting section (11), connecting said middle section (6) and said lower section (7), wherein said upper section (5), middle section (6) and lower section (7) are arranged along the longitudinal direction of said gasifier (1), with the upper section (5) placed on top of the middle section (6) which is placed on top of the lower section (7); - one or more carbonaceous material inlets (2) configured to receive a carbonaceous material feed and fluidly connected to the internal volume (4); - a bed material (9) inside the middle section (6) and/or lower section (7) and connected to at least one gas inlet (12) to fluidize the bed material; - a gas outlet (16), fluidly connected to the upper section (5) of the internal volume (4); and - at least one plasma system (8) configured inside the upper section (5) so that gas that leaves the gasifier (1) via the gas outlet (16) passes through a zone heated by said at least one plasma system (8); - a first cooling unit (18, 29), comprising a hot gas inlet (19) and a cold gas outlet (20), wherein said hot gas inlet (19) is fluidly connected to the gas outlet (16) of said gasifier (1); - a methanation unit (21), suitable to produce crude methane from syngas, comprising a syngas inlet (22) and a crude methane outlet (23), wherein said syngas inlet (22) is fluidly connected to said cold gas outlet (20) of the first cooling unit (18); - a second cooling unit (24,28), comprising a hot methane inlet (25) and a cold methane outlet (26), wherein said hot methane inlet (25) is fluidly connected to said crude methane outlet (23) of the methanation unit (21); wherein said first cooling unit and said second cooling unit independently comprise an economizer, an evaporator and/or a super-heater for steam production for the gasifier. Further does the invention also provide a process for the conversion of carbonaceous material in methane using such methanation system.