ATR and POX Feed CO2 Addition for Soot-Free Syngas Reforming
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Solution Overview
Problem
Existing ATR and POX reactors face challenges in reducing soot formation during hydrocarbon conversion to synthesis gas, leading to carbon loss, fouling, and high operational costs due to the need for excessive steam/oxygen use and pressure losses from high velocity mixing techniques.
Innovation Solution
Adding gaseous carbon dioxide to the hydrocarbon feed before entry into the reactor, adjusting the steam-to-carbon ratio using a corrected minimum value calculated by the formula (S/C)lim,CO2=(S/C)lim−ζ·(mCO2/mC), to suppress soot formation and optimize operating conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the steam to carbon ratio and oxygen to carbon ratio are increased to inhibit soot formation, then soot formation is reduced, but the consumption of steam or oxygen increases
Solution Approach 1:
Carbon dioxide is introduced as an intermediary substance that mediates between the hydrocarbon fuel and oxidant. It participates in the combustion chemistry to suppress soot formation mechanisms, allowing the process to operate with lower steam-to-carbon and oxygen-to-carbon ratios while maintaining reduced soot levels.
Solution Approach 2:
The invention changes the compositional parameter of the feed stream by adding carbon dioxide. This parameter change modifies the combustion chemistry and thermodynamics, enabling soot suppression at lower steam-to-carbon and oxygen-to-carbon ratios compared to conventional operations without CO2 addition.
2Object-affected harmful factors
If high velocity and swirling are applied to improve mixing between fuel and oxidant, then soot formation is reduced, but pressure loss increases
Solution Approach 1:
Carbon dioxide acts as a mixing intermediary that facilitates better mixing between fuel and oxidant streams without requiring high velocities or swirling. The CO2 stream interacts with both fuel and oxidant, enhancing mass transfer and mixing efficiency while maintaining lower flow velocities that reduce pressure losses.
3Loss of substance
If the steam to carbon ratio is reduced to minimize steam consumption, then operational costs are reduced, but soot formation increases
Solution Approach 1:
Carbon dioxide serves as a mediating substance that enables the system to operate at lower steam-to-carbon ratios. By participating in the combustion chemistry, CO2 suppresses soot formation mechanisms, allowing reduced steam consumption without the penalty of increased soot production.
Solution Approach 2:
The addition of carbon dioxide changes the chemical composition parameter of the feed, modifying the combustion pathway. This parameter change allows the steam-to-carbon ratio to be reduced while maintaining soot suppression, as the CO2 influences the chemical equilibrium and reaction pathways.
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
Reduces soot formation to negligible levels, minimizes steam consumption, and reduces pressure drop, thereby improving reactor efficiency and reducing operational costs.
Implementation Method 1
partial oxidation (POX) reactors are widely used in the field of production of synthesis gas
Implementation Method 2
The production of a CO-containing gas from a hydrocarbon source however requires under-stoichiometric combustion which may lead to undesirable formation of soot
Data Source
AI summary
A method for the suppression of soot formation during the partial oxidation of a hydrocarbon-containing gaseous feed, in the presence of steam and in an ATR reactor or in a POX reactor, the method comprising the addition of gaseous carbon dioxide to the hydrocarbon-containing gaseous feed before entry into the reactor. A method for determining a minimum steam to carbon ratio required for scot-free operation is also disclosed.