Isomerization Feed Temperature Control via Effluent Heat Recovery
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Solution Overview
Problem
Current methods for isomerization and separation of hydrocarbon feeds in the petrochemical and petroleum refining industries face significant utility consumption, despite efforts to improve heat recovery through heat exchange between hot and cooler streams, and often require additional heating sources.
Innovation Solution
A process that efficiently controls the temperature of a feed stream by combining it with a stream from a separation column and heating it in multiple heat exchangers, using effluent streams from isomerization reactors to minimize heat input, and optimizing heat exchange between isomerization and separation zones to reduce energy requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If heat exchange between hot effluent streams and cooler feed streams is implemented, then heat recovery is improved, but utility consumption remains high due to additional heating requirements
Solution Approach 1:
The patent combines multiple heat exchangers into an integrated heat recovery system where effluent streams from different reactors sequentially heat the feed stream at different stages, merging heat transfer operations to maximize energy utilization and minimize additional utility requirements
Solution Approach 2:
The patent changes the temperature parameters of the feed stream progressively through multiple heat exchangers, using effluent at different temperatures to heat the feed at different stages, optimizing the temperature differential and heat transfer efficiency throughout the process
2Loss of energy
If multiple heat exchangers are used to heat the feed stream, then heat recovery is enhanced, but device complexity increases
Solution Approach 1:
The effluent streams serve multiple functions: they heat the feed stream in heat exchangers and simultaneously provide heating to separation columns, making the thermal energy utilization multi-functional and reducing the need for separate heating systems
Solution Approach 2:
The heating process is segmented into multiple stages with different heat exchangers handling different temperature ranges and different effluent streams, allowing each component to be optimized for its specific function while contributing to the overall heat recovery system
3Use of energy by moving object
If effluent streams are used to heat separation columns, then energy efficiency is improved, but control precision becomes more difficult
Solution Approach 1:
The system uses feedback control where temperature sensors monitor the feed stream and effluent streams, and control valves adjust the flow distribution to maintain optimal temperature differentials and heating efficiency, automatically compensating for process variations
Solution Approach 2:
The system dynamically adjusts the flow of effluent streams to different heat exchangers and separation columns based on real-time temperature requirements, allowing flexible redistribution of thermal energy to maintain control precision while maximizing energy efficiency
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 leads to enhanced heat recovery and energy savings, lowering utility consumption, operating costs, and equipment size requirements by effectively utilizing heat from effluent streams and minimizing heat transfer to the feed stream in the stabilization zone.
Implementation Method 1
heating the feed stream in a first heat exchanger; heating the feed stream in a second heat exchanger; heating the feed stream in a third heat exchanger
Implementation Method 2
heating the feed stream in a charge heater
Implementation Method 3
separating a portion of an effluent from the isomerization zone in the first separation column
Implementation Method 4
heating a separation column with the effluent stream from the second reactor
Data Source
AI summary
A process for heating a feed stream to an isomerization zone by passing the feed stream though heat exchangers and heating the feeds stream with reactor effluent from the isomerization zone. The effluent from the last reactor is passed to a stabilization column and then a separation column, preferably without heating the feed stream. The separation column may also be heated with effluent from a reactor in the isomerization zone.