Quench Oil Cooling for Olefin Cracking Effluent
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Solution Overview
Problem
Olefin cracking processes face issues with fouling of heat exchange units and pressure drops, leading to reduced light olefin yields and increased energy consumption due to condensation of heavy hydrocarbons and inefficient cooling methods.
Innovation Solution
A process involving a single contact cooler with a quench oil stream to cool olefin cracking reactor effluent streams, minimizing pressure drop and fouling by using a countercurrent contact zone with a packed bed, and recycling a portion of the cooled oil stream to maintain efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If indirect heat exchange with cooling water is used to cool olefin cracking reactor effluent, then cooling capacity is provided, but fouling occurs reducing cooling capacity and requiring increased compressor size and energy consumption
Solution Approach 1:
The patent introduces a quench oil as an intermediary cooling medium between the hot olefin cracking effluent and the cooling water system. The quench oil absorbs heat from the effluent stream and prevents direct contact between the effluent and cooling water, thereby eliminating fouling of the heat exchanger surfaces while maintaining effective cooling capacity.
Solution Approach 2:
The patent extracts the harmful fouling problem by removing the direct heat exchange interface that causes condensation and fouling. By using a quench oil system, the harmful direct contact between effluent and cooling water is eliminated, allowing the cooling function to be maintained without the associated fouling issues.
2Temperature
If indirect heat exchange units are used to cool effluent, then cooling is achieved, but pressure drop increases requiring additional compressor energy
Solution Approach 1:
The quench oil serves as an intermediary that enables efficient heat transfer without creating significant pressure drop. The oil stream absorbs heat from the effluent while maintaining a low resistance flow path, thereby achieving effective cooling without the energy penalty of increased compressor power requirements.
3Temperature
If heavy hydrocarbons condense on heat exchange surfaces, then cooling occurs, but fouling reduces cooling capacity and increases downtime for cleaning
Solution Approach 1:
The quench oil acts as a protective intermediary layer that prevents heavy hydrocarbons from condensing directly on the heat exchanger surfaces. By absorbing heat and preventing condensation, the quench oil eliminates the fouling mechanism that would otherwise require periodic cleaning interruptions.
Solution Approach 2:
The patent converts the potential harm of heavy hydrocarbon condensation into a benefit by using quench oil to control the condensation process. The quench oil allows controlled heat transfer while preventing the harmful direct condensation on equipment surfaces, thereby maintaining continuous operation.
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 enhances light olefin yields, reduces fouling and pressure drops, and improves processing efficiency by maintaining a low pressure differential and effective cooling, thereby increasing the production of ethylene and propylene.
Implementation Method 1
contacting the olefin cracking reactor effluent stream with a quench oil stream in a single contact cooler contact zone to produce a cooled vapor stream and to form a heated quench oil stream
Implementation Method 2
single contact cooler with a quench oil stream to cool olefin cracking reactor effluent streams, minimizing pressure drop and fouling by using a countercurrent contact zone with a packed bed
Data Source
AI summary
A processing scheme and arrangement for enhanced olefin production involves cooling or treating an olefin cracking reactor effluent stream by contacting the olefin cracking reactor effluent stream with a quench oil stream in a single contact cooler contact zone to produce a cooled vapor stream and to form a heated quench oil stream. A pressure differential across the single contact cooler is less than about 3.5 kPa. The heated quench oil stream can be subsequently cooled and returned to the single contact cooler.