Dividing Wall Column Heating and Cooling Stream Management
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Dividing wall columns require expensive high-pressure steam for heating and low-pressure steam for cooling, which is inefficient and costly, whereas conventional columns can utilize intermediate steam duties at lower costs.
Innovation Solution
The system employs a dividing wall column with an imperforate wall dividing it into vertical sections, incorporating overhead and side condensers and reboilers to efficiently manage heating and cooling duties using lower temperature steam and process streams, reducing the need for high-temperature steam.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a dividing wall column is used to separate three or more products, then energy and capital savings are achieved compared to multiple conventional columns, but expensive high-pressure steam is required for heating and low-pressure steam for cooling
Solution Approach 1:
The column is divided into multiple sections by an imperforate wall, creating separate contacting sections for different product separations. This segmentation allows independent heating and cooling zones, enabling the use of lower-cost utilities in each section rather than requiring expensive high-pressure steam throughout the entire column.
Solution Approach 2:
Different thermal conditions are applied to different sections of the column. The heating stream is introduced at specific locations and the cooling stream is condensed at different temperature levels in different sections, matching local thermal requirements with appropriate utility sources to reduce overall energy costs.
2Reliability
If high-pressure steam is used for heating and low-pressure steam for cooling in a dividing wall column, then the required heating and cooling duties are met, but operating costs increase due to expensive utilities
Solution Approach 1:
The system changes the thermal parameters by introducing a heating stream at intermediate temperature levels rather than requiring high-pressure steam throughout. The cooling stream is condensed at different temperature levels in overhead and side condensers, allowing the use of lower-cost utilities while maintaining required duty levels.
Solution Approach 2:
A heating stream and cooling stream are introduced as intermediaries to transfer thermal energy within the column system. The heating stream provides necessary thermal energy at intermediate levels, and the cooling stream is condensed in stages, reducing dependence on expensive high-pressure steam and low-pressure steam utilities.
3Use of energy by moving object
If conventional distillation columns are used instead of a dividing wall column, then intermediate steam duties can be supplied at lower costs, but energy and capital savings are lost
Solution Approach 1:
Multiple separation functions that would require separate conventional columns are merged into a single dividing wall column. The imperforate wall creates multiple contacting sections within one column, achieving the separation efficiency of multiple columns while enabling intermediate steam duties to be supplied at lower costs through strategic heating and cooling stream placement.
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 enhances energy efficiency and reduces operating costs by allowing the use of lower-cost utilities for heating and cooling, thereby optimizing the energy usage in dividing wall columns.
Implementation Method 1
the overhead condenser receives an overhead stream including a light naphtha from the column
Implementation Method 2
a heating stream may pass through the reboiler and the same or a different heating stream through a side reboiler
Implementation Method 3
the divided distillation column produces at least two of a light naphtha, a medium naphtha, an aromatic naphtha, and a heavy naphtha
Data Source
AI summary
One exemplary embodiment can be a system for separating a plurality of naphtha components. The system can include a column, an overhead condenser, and a side condenser. Generally, the column includes a dividing imperforate wall with one surface facing a feed and another surface facing at least one side stream. Typically, the wall extends a significant portion of the column height to divide the portion into at least two substantially vertical, parallel contacting sections. Typically, the overhead condenser receives an overhead stream including a light naphtha from the column. Usually, a side condenser receives a process stream from the column and returns the stream to the column to facilitate separation. A cooling stream may pass through the overhead condenser and then the side condenser.