Divided Wall Column Vapor Control for Heat Integration
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Solution Overview
Problem
Conventional distillation systems for separating multicomponent streams are inefficient in terms of energy use and costly due to poor heat integration and the need for multiple columns, reboilers, condensers, and control circuitry, resulting in a large footprint and high operational expenses.
Innovation Solution
The implementation of a heat-integrated separation system using a divided wall column or thermally coupled columns with active vapor control, which includes a reboiler, condenser, and intermediate sections with vapor-liquid contact elements, allows for improved heat integration and energy efficiency by controlling vapor flow through vapor bypasses and restrictions, reducing the need for separate columns and associated equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate distillation columns are used for each component separation, then separation capability is improved, but system complexity and footprint increase
Solution Approach 1:
The patent combines multiple distillation functions into a single divided wall column that separates multiple components simultaneously. The column contains internal divided walls that create separate separation zones, allowing one column to perform the work of multiple conventional columns while reducing system complexity and footprint.
Solution Approach 2:
The divided wall column serves multiple separation functions within a single unit. The internal divided walls enable the column to separate different component ranges (light, intermediate, and heavy components) in simultaneous operations, making the single column universal for multiple separation tasks.
2Manufacturing precision
If separate distillation columns with individual reboilers and condensers are implemented, then separation precision is improved, but energy consumption increases
Solution Approach 1:
The patent converts the harmful waste heat from the condenser into a beneficial resource by using it to preheat the feed stream entering the column. This heat integration reduces the energy demand of the reboiler while maintaining separation precision, effectively converting energy waste into useful heating.
Solution Approach 2:
The system recovers thermal energy that would otherwise be discarded in the condenser. By implementing heat exchangers that capture condenser heat and transfer it to the feed stream, the system recovers and reuse thermal energy, reducing overall energy consumption while maintaining separation effectiveness.
3Ease of operation
If conventional distillation systems are used, then ease of operation is maintained, but operational costs increase due to poor heat integration
Solution Approach 1:
The patent converts the harmful waste heat from the condenser into a beneficial resource by using it to preheat the feed stream entering the column. This heat integration reduces the energy demand of the reboiler while maintaining separation precision, effectively converting energy waste into useful heating.
Solution Approach 2:
The system uses its own internal heat streams to serve its heating needs. The condenser heat automatically preheats the feed stream through integrated heat exchangers, creating a self-sustaining thermal system that reduces external energy requirements without adding operational complexity.
4Measurement precision
If multiple control valves and control circuitry are added to each column, then control precision is improved, but device complexity increases
Solution Approach 1:
The patent consolidates control functions by implementing a single control valve at the column overhead that regulates total vapor flow. This unified control approach replaces multiple individual control valves and simplifies the control system while maintaining adequate control precision for the combined separation process.
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 energy efficiency, reduces equipment costs and footprint, and provides better control over product composition during disturbances, leading to lower energy consumption and operational costs while maintaining product purity.
Implementation Method 1
a reboiler to receive liquid from a lower end of the column and to provide vapor to the lower end of the stripping section
Implementation Method 2
a condenser to receive vapor from an upper end of the rectifying section and to provide liquid to the upper end of the rectifying section
Implementation Method 3
intermediate sections with vapor-liquid contact elements
Data Source
AI summary
A separation system includes a column including a stripping section proximal to a lower end of the column, a rectifying section proximal to an upper end of the column, and an intermediate section disposed between the stripping section and the rectifying section. The intermediate section includes first and second vertical sides separated by a vertical wall. The column includes a feed port to receive a material stream to be separated. The separation system further includes a reboiler in fluid communication with the column. The reboiler provides vapor to the stripping section. The separation system also includes a condenser in fluid communication with the column. The condenser provides liquid to the rectifying section, the condenser to provide a distillate effluent stream. The separation system further includes an active vapor control to control the relative vapor flow rate to the first and second sections.