Induction Heated Fluidized Bed Reactor with Dual Bed Materials
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Solution Overview
Problem
Existing fluidized bed reactor heating methods face challenges in achieving high operating temperatures without direct contact between electroconductive materials and raw materials, which can lead to unwanted catalytic impacts and difficulties in heating ferromagnetic materials.
Innovation Solution
The method involves a fluidized bed reactor with at least two bed materials, where the first bed material comprising electroconductive material is heated indirectly using induction heating in the lower part of the reactor, transferring heat to the fluidizing agent and second bed material without direct contact, allowing for efficient heating of the raw material in the upper part without catalytic interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If direct contact heating is used between electroconductive materials and raw material, then heating efficiency is improved, but unwanted catalytic impacts occur
Solution Approach 1:
The patent introduces a non-electroconductive bed material as an intermediary substance between the electroconductive heating elements and the raw material. This intermediary bed material receives heat from the electroconductive materials through conduction and transfers it to the raw material, thereby enabling efficient heating while preventing direct catalytic contact between electroconductive materials and raw material.
2Power
If ferromagnetic materials are used for heating, then inductive heating is effective, but direct contact with raw material causes catalytic interference
Solution Approach 1:
The patent employs a non-electroconductive bed material as a mediator that allows inductive heating to occur effectively while preventing ferromagnetic materials from directly contacting raw material. The intermediary bed material conducts heat from the heated ferromagnetic particles to the raw material, eliminating catalytic interference while maintaining heating effectiveness.
Solution Approach 2:
The patent applies different material properties to different regions: electroconductive and ferromagnetic materials are used in specific zones for heating, while non-electroconductive materials are used in contact zones with raw material. This local differentiation allows each material to perform its optimal function without causing harmful effects.
3Temperature
If electrical heating is used in fluidized bed reactor, then heating is achieved, but high operating temperatures are difficult to reach
Solution Approach 1:
The patent uses an intermediary bed material that facilitates heat transfer from electrical heating elements to the bulk material. This intermediary substance improves thermal conductivity and enables more effective heat distribution, allowing the system to reach high operating temperatures more easily and uniformly.
Solution Approach 2:
The patent optimizes material parameters such as thermal conductivity, particle size, and density of the bed material to enhance heat transfer efficiency. By changing these parameters, the system achieves more effective electrical heating and can reach high operating temperatures with reduced difficulty.
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 approach enables effective and CO-emission-free heating of the fluidizing agent and raw material, avoiding catalytic impacts while maintaining energy and cost efficiency, and is suitable for various fluidized bed processes including gasification and pyrolysis.
Implementation Method 1
The first bed material is heated by induction heating in the lower part of the reactor
Implementation Method 2
heat is transferred from the first bed material to the fluidizing agent and/or to the second bed material
Data Source
AI summary
A method and apparatus for treating raw material in a fluidized bed reactor comprising at least two bed materials are provided. The second bed material is subjected into a lower part of the fluidized bed reactor that includes first the bed material having electroconductive material. A fluidizing agent is fed to a bottom of the fluidized bed reactor, and the fluidizing agent flows through the lower part of the reactor to an upper part of the fluidized bed reactor. The first bed material is inductively heated and heat is transferred from the first bed material to the fluidizing agent and/or to the second bed material in the lower part of the reactor. The heated second bed material is fluidized by the fluidizing agent to the upper part of reactor. The raw material is fed to the upper part of the reactor where the raw material is treated.