Catalytic Gas Purification Using Oxygen to Break Down Tars
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Solution Overview
Problem
Existing gas purification methods struggle to effectively remove tars and undesired hydrocarbons, such as benzene, from gasification gases without the need for complex catalysts or high temperatures that lead to the formation of polyaromatic hydrocarbons (PAH) and carbon black.
Innovation Solution
A catalytic treatment reactor with a catalyst zone uses oxygen gas to react with gas containing tars and hydrocarbons, employing catalysts like zirconium-based materials, to convert these impurities through catalytic partial oxidation, preventing the formation of PAH and carbon black.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If catalytic reforming is used to clean gasification gas, then tars and hydrocarbons can be converted to products, but specific catalysts such as noble metal or nickel catalysts are needed and the construction of the reformer becomes complicated with several different layers and catalysts
Solution Approach 1:
The patent extracts and removes tars and hydrocarbons from the gasification gas through a simplified catalytic reactor design, eliminating the need for complex multi-layer reformer structures while maintaining effective gas cleaning functionality
Solution Approach 2:
The catalytic reactor is designed to perform multiple functions simultaneously: tar removal, hydrocarbon conversion, and gas purification in a single integrated unit, replacing the need for separate complex reforming stages with multiple catalyst layers
2Reliability
If thermal cracking is used to clean gasification gas, then unstable tars can be degraded at high temperatures, but polyaromatic hydrocarbons (PAH) and carbon black form during the process
Solution Approach 1:
The patent changes the operational parameters by conducting catalytic oxidation at controlled temperatures (200-400°C) rather than high-temperature thermal cracking, which effectively degrades tars while preventing the formation of harmful PAH and carbon black byproducts
Solution Approach 2:
The patent introduces oxygen or air as an oxidizing agent to promote complete oxidation of tars and hydrocarbons, converting them into harmless CO2 and H2O instead of allowing them to form PAH and carbon black through incomplete thermal decomposition
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
The method achieves significant decomposition of over 70% of tars and hydrocarbons, producing a purified gas with low impurity levels, avoiding the need for additional post-treatment and reducing the risk of soot formation.
Implementation Method 1
the gas reacts with the oxygen gas by means of a catalytic partial oxidation on the catalyst
Implementation Method 2
the gas reacts with the oxygen gas by means of a catalytic partial oxidation on the catalyst
Data Source
AI summary
The invention relates to a method and an apparatus for purifying gas, wherein the gas which includes at least tars and/or undesired hydrocarbons is supplied to a catalytic treatment reactor which has at least one catalyst zone including at least one catalyst element with a catalyst, oxygen gas is fed into the catalyst element of the catalyst zone in the catalytic treatment reactor and is supplied through the catalyst element, the gas is arranged to flow to the catalyst zone and arranged to contact with the oxygen gas and the catalyst, and a purified gas is discharged from the catalytic treatment reactor. Further, the invention relates to the use of the method.