Electrically Heated Moving-Bed Reactor for High-Temperature Gas Conversion
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Solution Overview
Problem
Existing reactors for endothermic high-temperature reactions using fossil fuels for heating produce CO2 emissions and face issues with carbon deposition leading to reduced pourability and blocking of inert solid material particles, limiting economic efficiency.
Innovation Solution
A reactor design with a moving bed of solid material particles that uses electrical heating to transfer heat from the particles to the feed gas, incorporating heat integration zones to recover and preheat gases, and employs electrodes that allow particle flow without obstruction, using high-temperature-resistant materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If electrical heating is used to heat solid material particles in the reaction zone, then CO2 emissions are reduced and energy efficiency is improved, but carbon deposition on particles reduces pourability and causes blocking
Solution Approach 1:
The harmful carbon deposits are extracted and removed from the solid material particles through a separate carbon removal system. This allows the particles to maintain their pourability and flow characteristics while still enabling the endothermic reaction to proceed with electrical heating, thus resolving the contradiction between reducing CO2 emissions and maintaining particle flow continuity.
Solution Approach 2:
The physical and chemical parameters of the solid material particles are changed by controlling the electrical heating conditions, reaction temperature, and residence time. These parameter changes optimize the balance between achieving sufficient heating for the endothermic reaction and minimizing carbon deposition that would affect particle pourability, thereby maintaining reliable continuous operation.
2Temperature
If fossil fuels are combusted for heating, then high temperature is achieved for endothermic reactions, but CO2 emissions are produced and energy efficiency is limited
Solution Approach 1:
The mechanical/chemical combustion system is replaced with an electrical heating system. Electrical energy is used to heat the solid material particles directly through resistive heating or induction heating, eliminating the need for fossil fuel combustion. This substitution achieves the required high reaction temperatures while avoiding CO2 emissions and improving overall energy efficiency.
Solution Approach 2:
The heating method parameter is changed from fossil fuel combustion to electrical heating. This parameter change fundamentally alters the energy input mechanism, allowing precise control of temperature while eliminating carbon emissions. The electrical heating system can achieve the same high temperatures required for endothermic reactions without the environmental drawbacks of fossil fuel combustion.
3Loss of energy
If heat integration zones are added to preheat feed gas and recover heat from product gas, then energy efficiency is improved, but device complexity increases
Solution Approach 1:
The heat integration zones are merged with the main reaction zone to form an integrated reactor structure. The feed gas preheating and product gas heat recovery functions are combined with the endothermic reaction process in a single continuous system. This merging approach improves energy efficiency by maximizing heat recovery while avoiding the complexity of separate standalone heat exchangers.
Solution Approach 2:
The solid material particles serve multiple functions simultaneously: they act as the reaction medium for the endothermic reaction, as the heat transfer medium for electrical heating, and as the heat storage medium for heat integration. This multi-functionality allows the system to achieve high energy efficiency through heat recovery without requiring additional complex equipment, as the same particles perform multiple roles in different zones.
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
Achieves efficient operation without fossil heating, reduces CO2 emissions, and prevents blocking by maintaining particle flow, with high heat recovery and rapid heating/cooling times for improved reaction control.
Implementation Method 1
heating the solid material particles in the reaction zone (for example, by generating an electric current in the solid material particles, in other words by generating Joule heat in the solid material particles)
Implementation Method 2
transferring heat from the solid material particles to the feed gas
Implementation Method 3
heat from the product gas produced in the reaction zone can be transferred to solid material particles of the reactor bed
Implementation Method 4
Heat integration can be achieved by the counterflow condition of solid and gas facilitating high method efficiency
Data Source
AI summary
A reactor for carrying out an endothermic reaction, in particular a high-temperature reaction, in which a product gas is obtained from a feed gas, wherein: the reactor surrounds a reactor interior; the reactor is configured to provide a reactor bed in a reaction zone of the reactor interior, which reactor bed comprises a large number of solid material particles; the reactor is also configured to guide the feed gas into the reaction zone; in order to heat the feed gas, the reactor is designed to heat the solid material particles in the reaction zone such that, by transferring heat from the solid material particles to the feed gas, the feed gas in the reaction zone can be heated to a reaction temperature in order to participate as a starting product in the endothermic reaction for producing the product gas.