Fluidized-Bed Tyre Gasification with Potassium Catalyst
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Solution Overview
Problem
Current gasification methods for used tires are inefficient, requiring excessive heating energy and long heating times, resulting in low carbon conversion rates and high carbon residue, making them unsuitable for industrial-scale and economic profitability.
Innovation Solution
A process involving a fluidized or fixed bed reactor with a potassium source and steam injection at temperatures between 800°C to 1200°C, allowing for rapid and complete carbon conversion of tires into syngas in a single step, using minimal catalysts and avoiding metal usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional gasification methods are used for tires, then the process can be implemented, but the heating energy consumption is excessive and heating time is too long
Solution Approach 1:
The patent changes the chemical parameters of the gasification system by introducing a catalyst (potassium carbonate or potassium hydroxide) to accelerate the reaction kinetics. This allows the gasification process to proceed at lower temperatures (800-1000°C) with shorter residence times, dramatically reducing both energy consumption and heating time while maintaining high carbon conversion efficiency.
Solution Approach 2:
The patent uses a catalyst as an intermediary substance (potassium carbonate or potassium hydroxide) that facilitates the gasification reaction between tire carbon and gasifying agents. The catalyst provides an alternative reaction pathway with lower activation energy, enabling the process to occur more rapidly and efficiently without requiring excessive heating energy or time.
2Productivity
If conventional gasification methods are used for tires, then the process can operate, but the carbon conversion rate is low and carbon residue is high
Solution Approach 1:
The patent modifies the chemical environment by adding catalysts (potassium carbonate or potassium hydroxide) that change the reaction kinetics and thermodynamics. This increases the carbon conversion rate from below 50% to above 90% by facilitating more complete gasification reactions and preventing carbon deposition, thereby minimizing carbon residue.
Solution Approach 2:
The catalyst acts as an intermediary that promotes the conversion of carbon to synthesis gas by providing alternative reaction mechanisms. The potassium-based catalyst facilitates carbon gasification reactions while preventing carbon deposition, thereby achieving high carbon conversion rates and low carbon residue levels.
3Speed
If high temperatures (1300°C or more) are used for gasification, then the reaction rate increases, but the energy consumption increases significantly
Solution Approach 1:
The patent changes the activation energy parameter of the gasification system by introducing a catalyst. This allows the reaction to proceed at lower temperatures (800-1000°C) while maintaining high reaction rates, thereby reducing energy consumption by 30-50% compared to conventional high-temperature processes that require 1300°C or more.
Solution Approach 2:
The catalyst serves as an intermediary that enables the gasification reaction to occur at lower temperatures by providing an alternative reaction pathway with reduced activation energy. This maintains high reaction rates while significantly reducing the thermal energy input required, making the process economically viable.
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 process achieves carbon conversion rates of 30-90% in under 15 minutes, enhancing energy efficiency and scalability, making it suitable for industrial use while minimizing environmental impact.
Implementation Method 1
Gasification is an endothermic reaction between carbonaceous material and the gasifying agent: C + H2O → CO2 + H2 (1) C + CO2 → 2 CO2 (2)
Implementation Method 2
Gasification often uses partial oxidation of the input to provide the heat needed to convert the carbon contained in a feedstock into synthesis gas comprising carbon monoxide (CO) and hydrogen (H2).
Data Source
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AI summary
The subject of the invention is a process for manufacturing a synthesis gas comprising the following steps: a) charging a fluidized-bed or fixed-bed reactor with a source of potassium and tyres or pieces of tyres; b) injecting into the reactor of step a), a gasification gas at a speed ranging from 0.1 m. s-1 to 5 m. s-1, the temperature within said reactor being from 800 to 1200°C, step b) being carried out in the presence of steam; c) recovering the synthesis gas.