Steam Cracker Feedstock Flexibility With Vaporized Streams to Reduce Fouling
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Solution Overview
Problem
Steam crackers are designed for specific feedstocks and have limited flexibility, making it challenging to adapt to unconventional feedstocks like hydrotreated plastic pyrolysis oil, which often contain impurities that cause fouling and require significant capital investment and logistical challenges.
Innovation Solution
A process for purifying a secondary hydrocarbon stream by evaporating and combining it with a primary stream in the presence of steam, followed by thermal cracking, to produce ethylene and propylene, while minimizing fouling and equipment damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If steam crackers are designed for specific feedstocks to optimize thermal efficiency and product yield, then manufacturing precision and productivity are improved, but adaptability to unconventional feedstocks deteriorates
Solution Approach 1:
The steam cracker unit is designed to handle multiple feedstock types (conventional hydrocarbons and unconventional feedstocks like hydrotreated plastic pyrolysis oil) through a universal processing approach. The invention enables the same equipment to process diverse feedstocks by implementing specific pre-treatment and processing modifications, eliminating the need for separate dedicated units for each feedstock type.
Solution Approach 2:
The invention modifies operational parameters and processing conditions to enable the steam cracker to handle unconventional feedstocks. By adjusting temperature profiles, residence times, and steam-to-feed ratios, the unit can adapt to varying feedstock compositions while maintaining acceptable productivity and product quality.
2Adaptability or versatility
If unconventional feedstocks are processed to improve feedstock flexibility, then adaptability is improved, but fouling and equipment reliability deteriorate
Solution Approach 1:
The invention implements pre-treatment steps before the main cracking process to remove problematic components from unconventional feedstocks. By performing preliminary separation and purification, the unit prevents fouling and deposits in downstream equipment, maintaining reliability while processing flexible feedstock streams.
Solution Approach 2:
The invention extracts and removes harmful impurities and problematic components from the feedstock before it enters the cracking unit. By taking out contaminants and non-volatile substances, the process protects equipment from fouling while still utilizing the valuable hydrocarbon content of unconventional feedstocks.
3Adaptability or versatility
If impure hydrocarbon streams are processed to enhance feedstock flexibility, then adaptability is improved, but equipment damage and loss of time increase
Solution Approach 1:
The invention performs preliminary separation and purification operations to prepare impure feedstocks for processing. By completing these pre-treatment steps before main processing, the unit avoids interruptions and downtime that would otherwise occur due to fouling and equipment damage, thus reducing overall process time while maintaining flexibility.
4Adaptability or versatility
If capital investment is increased to adapt steam crackers to unconventional feedstocks, then adaptability is improved, but device complexity increases
Solution Approach 1:
The invention designs a universal processing approach that enables a single steam cracker unit to handle both conventional and unconventional feedstocks. By implementing multi-functionality, the unit eliminates the need for separate dedicated processing lines, reducing overall capital investment and device complexity while achieving high adaptability.
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
Enhances feedstock flexibility in steam crackers by reducing fouling and equipment downtime, allowing the processing of impure hydrocarbon streams efficiently.
Implementation Method 1
Evaporating the secondary hydrocarbon stream, optionally in the presence of steam, to obtain a secondary gaseous hydrocarbon stream
Implementation Method 2
Thermal cracking the combined hydrocarbon and steam mixture under conditions enabling production of ethylene and propylene
Data Source
AI summary
Process for the purification, treatment and steam cracking of a secondary hydrocarbon stream in combination with a primary hydrocarbon stream, wherein the secondary hydrocarbon stream is vaporized before introduction within the convection section of a steam cracker furnace in combination with at least a portion of the said primary hydrocarbon stream.