Molten Pool Hydrogen Cracking via Joule Heating
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Solution Overview
Problem
Existing methods for converting hydrocarbons into hydrogen result in significant CO2 emissions, as they rely on external heating sources that emit CO2, such as fossil fuels, or inefficient heat transfer methods that reduce conversion yields and increase energy consumption.
Innovation Solution
A process and apparatus that utilize a molten metal and/or salt medium within a conversion reactor, where the heat required for the hydrocarbon cracking reaction is supplied by an electric current passing through the molten medium, minimizing CO2 emissions and improving heat transfer efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If external heating sources (fossil fuels) are used to heat the reactor, then the cracking reaction can proceed, but CO2 emissions increase significantly
Solution Approach 1:
The patent replaces the mechanical/chemical heating system (fossil fuel combustion) with an electrical heating system. Electric current is passed through the molten metal medium, which has electrical resistance, generating heat through Joule heating. This substitution eliminates CO2 emissions from heating while maintaining the required temperature for the cracking reaction.
Solution Approach 2:
The patent changes the heating mechanism from external combustion heating to internal resistive heating. By utilizing the electrical resistance property of the molten metal medium and passing current through it, the system transforms the heating parameter source from fossil fuel chemical energy to electrical energy, thereby eliminating CO2 emissions.
2Temperature
If external heating through reactor walls is used, then the reactor can be heated, but heat transfer efficiency decreases and temperature gradients increase
Solution Approach 1:
The patent merges the heating function with the reaction medium itself. The molten metal serves dual purposes: as the reaction medium for methane cracking and as the heating element through which electric current passes. This eliminates the separate heating system and its associated heat transfer losses.
Solution Approach 2:
The molten metal medium serves itself by converting electrical energy directly into thermal energy through its own electrical resistance. The system heats itself internally without requiring external heating apparatus, eliminating temperature gradients and heat transfer inefficiencies associated with wall-based heating.
3Object-generated harmful factors
If hydrogen produced is burned for heating, then CO2 emissions are reduced, but the value of the hydrogen product decreases
Solution Approach 1:
The patent introduces electricity as an intermediary energy carrier between the energy input and the cracking reaction. Instead of using the produced hydrogen for heating (which would consume the product), electrical energy serves as the intermediary that heats the system without being consumed in the chemical reaction, preserving the full value of the hydrogen output.
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 effectively reduces or eliminates CO2 emissions by using renewable energy for heating, enhances heat transfer efficiency to over 95%, and allows for the use of fossil fuels to be minimized or avoided, while maintaining high hydrogen yields.
Implementation Method 1
the heat required for the cracking reaction is supplied by the electric current produced by applying an electric field by means of electrodes directly immersed in said molten pool
Implementation Method 2
the heat required for the cracking reaction is supplied by the electric current produced by applying an electric field by means of electrodes directly immersed in said molten pool
Data Source
AI summary
A hydrocarbon cracking process for producing gaseous hydrogen and solid carbon in a medium consisting of a pool of molten metals and/or salts, characterized in that the heat required for the cracking reaction is supplied to said molten pool by circulating an electric current directly in said molten pool obtained by applying an electric field supplied by electrodes immersed in said molten pool.