Alternating Temperature Carbon Bed for Hydrogen Production
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Solution Overview
Problem
Current processes for producing hydrogen, carbon monoxide, and carbon-containing products face challenges such as high energy input requirements, significant CO2 emissions, and high operational costs, particularly due to the need for maintaining reaction temperatures above 1000°C for endothermic pyrolysis.
Innovation Solution
A process and apparatus utilizing a bed of carbon-containing material that alternates between heating to temperatures above 800°C and cooling to 900°C, allowing for the production of hydrogen and carbon monoxide during the heating phase and carbon and hydrogen during the cooling phase, with the energy from combustion being optimally reused to reduce external energy input.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional processes are used to produce hydrogen and carbon monoxide through endothermic pyrolysis, then the desired products are obtained, but high energy input is required to maintain reaction temperatures above 1000°C
Solution Approach 1:
The patent implements periodic alternation between exothermic combustion phase and endothermic pyrolysis phase. During combustion, fuel reacts with oxygen to generate heat; during pyrolysis, the heated carbon-containing material decomposes hydrocarbons. This periodic switching allows the system to reuse generated heat rather than continuously supplying external energy, resolving the contradiction between maintaining high temperature and reducing energy input.
Solution Approach 2:
The patent changes the operational parameters by alternating between different temperature regimes and reaction types. The system transitions from high-temperature combustion to controlled pyrolysis at slightly lower temperatures, optimizing energy efficiency while maintaining product formation. This parameter variation allows the system to avoid continuous high-energy input while achieving the desired thermal conditions for product synthesis.
2Quantity of substance
If conventional hydrogen production processes are used, then hydrogen is produced, but significant CO2 emissions occur
Solution Approach 1:
The patent converts the harmful CO2 emissions into a beneficial outcome by using CO2 as a reactant in the pyrolysis process. CO2 reacts with the carbon-containing material during pyrolysis to produce carbon monoxide and hydrogen, thereby reducing net CO2 emissions while enhancing product yield. This transforms the harmful greenhouse gas into a useful reactant, resolving the contradiction between hydrogen production and CO2 emission reduction.
3Quantity of substance
If endothermic pyrolysis is performed to produce hydrogen and carbon monoxide, then the desired synthesis gas is obtained, but high operational costs result from continuous energy supply
Solution Approach 1:
The patent merges the exothermic combustion reaction and endothermic pyrolysis reaction into a single integrated process system. The combustion phase generates heat that directly supplies the pyrolysis phase, eliminating the need for separate external energy sources. This merging of reactions reduces operational costs by utilizing internally generated energy rather than requiring continuous external energy supply, while maintaining synthesis gas production.
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 results in a significant reduction of CO2 footprint, improved energy efficiency, lower production costs, and the ability to produce synthesis gas with a desired H2/CO ratio, making the process suitable for large-scale production.
Implementation Method 1
heating the bed of carbon-containing material to a temperature of >800° C. by reacting hydrogen with oxygen
Implementation Method 2
decomposing the hydrocarbons in the presence of the bed of carbon-containing material to give carbon and hydrogen, the temperature of the bed of carbon-containing material decreasing in the process
Implementation Method 3
the energy from combustion being optimally reused to reduce external energy input
Data Source
AI summary
The invention relates to a process for producing hydrogen, carbon monoxide and a carbon-containing product in at least one reaction apparatus, wherein the at least one reaction apparatus comprises a bed of carbon-containing material and is characterized in that the bed of carbon-containing material in the at least one reaction apparatus is alternately heated to a temperature of >800° C. and, no later than upon reaching a temperature of 1800° C., cooled to a maximum of 800° C., wherein hydrogen and carbon monoxide are produced during the heating phase and carbon and hydrogen are produced during the cooling phase.