Iron Copper Spinel Coating Resists Coke Formation
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Solution Overview
Problem
Existing technologies face challenges in preventing coke formation and carburization on metal surfaces exposed to hydrocarbons at elevated temperatures, particularly in environments like hydrocarbon processes, iron ore reduction furnaces, and jet engines.
Innovation Solution
A metal substrate with a nickel content of 20 to 50 wt. % and a surface coating comprising an iron copper spinel, which includes specific weight percentages of compounds like MnCr2O4, Cr0.23Mn0.08Ni0.69, Cr1.3Fe0.7O3, Cr2O3, and CuFe5O8, applied using methods such as chemical vapor deposition, spray coating, or laser ablation, and then subjected to alternating oxidation and reduction treatments at temperatures from 500° C to 1000° C.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional metal surfaces are exposed to hydrocarbons at elevated temperatures, then hydrocarbon processing occurs, but coke formation and carburization occur on the metal surface
Solution Approach 1:
The invention applies a composite spinel coating containing copper (0.1-10 wt%), iron (2-40 wt%), and chromium (1-30 wt%) oxides on the metal substrate. This composite material structure provides resistance to coke formation and carburization while maintaining hydrocarbon processing capability at elevated temperatures up to 1000°C.
Solution Approach 2:
The coating composition parameters are optimized with specific ranges: copper oxide 0.1-10 wt%, iron oxide 2-40 wt%, chromium oxide 1-30 wt%, with the balance being mill scale or substrate. These parameter variations allow tuning of the coating's resistance properties against coke and carbon penetration while maintaining processability.
2Reliability
If metal surfaces are protected against coke formation using traditional coatings, then surface protection improves, but the coating may not withstand temperatures up to 1000° C. or resist carburization effectively
Solution Approach 1:
The spinel coating combines copper oxide, iron oxide, and chromium oxide in specific proportions to create a composite material that maintains structural integrity and protective properties at temperatures up to 1000°C. The synergistic interaction between these oxide components provides both thermal stability and resistance to coke formation.
Solution Approach 2:
The coating creates a localized protective layer with specific chemical composition on the metal surface. The spinel structure forms a dense, adherent layer with controlled porosity and chemistry that provides targeted protection against coke formation and carbon penetration at the surface interface, while the bulk material properties remain unchanged.
3Reliability
If a copper-containing spinel coating is applied to resist coke formation, then resistance to coke and carburization improves, but the coating application process becomes more complex
Solution Approach 1:
The coating process utilizes mill scale (a byproduct from steel manufacturing) as part of the coating composition, converting a waste material into a useful component. This self-service approach reduces the need for additional protective materials and simplifies the overall coating formulation while maintaining effective protection against coke and carburization.
Solution Approach 2:
The spinel coating serves multiple functions simultaneously: it provides resistance to coke formation, prevents carburization, withstands elevated temperatures up to 1000°C, and can be applied using conventional coating techniques. The multi-functional nature of the coating reduces the need for multiple separate protective systems.
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 iron copper spinel coating effectively resists coke formation and carburization, maintaining surface integrity and performance in harsh hydrocarbon environments, as demonstrated by reduced coke formation and improved ethylene yield in steam cracking processes.
Implementation Method 1
subjected to alternating oxidation and reduction treatments at temperatures from 500° C to 1000° C
Implementation Method 2
subjected to alternating oxidation and reduction treatments at temperatures from 500° C to 1000° C
Implementation Method 3
applied using methods such as chemical vapor deposition, spray coating, or laser ablation
Data Source
AI summary
An anti-coking surface having a thickness up to 15 microns comprising from 15 to 50 wt. % of MnCr2O4 (for example manganochromite); from 15 to 25 wt. % of Cr0.23Mn0.08Ni0.69 (for example chromium manganese nickel); from 10 to 30 wt. % of Cr1.3Fe0.7O3 (for example chromium iron oxide); from 12 to 20 wt. % of Cr2O3 (for example eskolaite); from 4 to 20 wt. % of CuFe5O8 (for example copper iron oxide); and less than 5 wt. % of one or more compounds chosen from FeO(OH), CrO(OH), CrMn, Si and SiO2 (either as silicon oxide or quartz) and less than 0.5 wt. % of aluminum in any form provided that the sum of the components is 100 wt. % is provided on steel.