Segmented Distillation Column With Mechanical Heat Pump
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Solution Overview
Problem
Mechanical-heat-pump distillation columns face challenges in achieving significant energy savings when there is a large column temperature difference, as the compressor power consumption increases with the temperature difference, leading to reduced energy efficiency.
Innovation Solution
The solution involves dividing a conventional distillation column into two separate columns, one with a larger column temperature difference and the other with a smaller temperature difference, applying the mechanical-heat-pump distillation process only to the region with the smaller temperature difference, thereby reducing the compressor power required and enhancing energy savings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a mechanical-heat-pump distillation column is applied to achieve energy savings, then energy consumption is reduced, but compressor power consumption increases when there is a large column temperature difference
Solution Approach 1:
The distillation column is divided into two separate columns: a first column handling the region with large temperature difference (without mechanical heat pump) and a second column handling the region with small temperature difference (with mechanical heat pump). This segmentation allows the mechanical heat pump to operate efficiently only where the temperature difference is small, reducing compressor power consumption while still achieving energy savings in the appropriate section.
Solution Approach 2:
The mechanical heat pump system is applied selectively to only the region with small temperature difference (second column), while the region with large temperature difference (first column) uses conventional distillation. This local application ensures that the heat pump operates in the most efficient zone, maximizing energy savings while minimizing compressor power requirements.
2Manufacturing precision
If the column temperature difference is increased to improve separation efficiency, then distillation performance is improved, but compressor power consumption increases
Solution Approach 1:
By dividing the distillation process into two columns with different temperature difference characteristics, the system can maintain high separation efficiency in the first column (with large temperature difference) while using the mechanical heat pump in the second column (with small temperature difference) to optimize energy efficiency. Each column operates in its optimal range.
Solution Approach 2:
The system changes the operating parameters by creating two distinct columns with different temperature difference profiles. The first column operates with large temperature difference for efficient separation, while the second column operates with small temperature difference to enable efficient mechanical heat pump operation, thus resolving the contradiction between separation efficiency and energy consumption.
3Loss of energy
If a mechanical heat pump system is applied to the entire column, then heat utilization is optimized, but device complexity increases
Solution Approach 1:
The system segments the mechanical heat pump application to only the second column (region with small temperature difference), avoiding the complexity of implementing heat pump systems throughout the entire distillation process. This partial implementation reduces device complexity while still achieving significant heat utilization optimization in the appropriate section.
Solution Approach 2:
Instead of applying the mechanical heat pump system to the entire column (excessive action), the invention applies it partially to only the region where it is most effective (small temperature difference region). This partial application achieves sufficient heat utilization optimization without the excessive complexity of a full-column implementation.
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 configuration allows for significant energy savings in distillation columns with large temperature differences by optimizing the mechanical-heat-pump distillation process, particularly when a significant temperature difference occurs near the column top or bottom, while maintaining effective heat utilization and reducing compressor power consumption.
Implementation Method 1
a vapor withdrawn from any position of the distillation column is compressed by the compressor to be increased in temperature
Implementation Method 2
heat can be exchanged between the rectifying section and the stripping section. Accordingly, heat is transferred from the rectifying section to the stripping section (internal heat exchange)
Data Source
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AI summary
Significant energy saving can be achieved for a distillation column even when the distillation column has a large column temperature difference. Provided is a distillation column including a first (A1) and second columns (A2), wherein the first column (A1) includes a part of a rectifying section or a part of a stripping section; the second column includes, if the first column includes a part of the rectifying section, the rest of the rectifying section (A3) and the whole of the stripping section (A4), or the second column includes, if the first column includes a part ofthe stripping section, the rest ofthe stripping section and the whole ofthe rectifying section; and the second column constitutes a mechanical-heat-pump distillation column (A6, A8).