Cryogenic Air Separation Column Layout for High Oxygen Output
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Solution Overview
Problem
Existing low-temperature air separation systems face limitations in oxygen production capacity and compactness, with strict constraints on column height and diameter for transportation, making it challenging to achieve high oxygen production while maintaining a compact design.
Innovation Solution
The system incorporates a high-pressure column, low-pressure column, a main condenser-evaporator, an auxiliary column, an argon removal column, and an argon removal column top condenser, arranged in a specific configuration to enhance oxygen production capacity and compactness, with the low-pressure column beside the high-pressure column, and additional columns used for argon removal and oxygen recovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the column height and diameter are increased to achieve high oxygen production capacity, then the oxygen production capacity is improved, but the system becomes too large for transportation
Solution Approach 1:
The system is divided into multiple functional columns (high-pressure column, low-pressure column, auxiliary column, argon removal column) that can be separately manufactured and then assembled. This segmentation allows each column to be compact enough for transportation while the integrated system provides high oxygen production capacity.
Solution Approach 2:
The patent employs a nested arrangement where the auxiliary column is positioned inside the high-pressure column, and the argon removal column is positioned inside the low-pressure column. This nesting strategy maximizes space utilization and reduces the overall system footprint, enabling compact transportation while maintaining high production capacity.
2Productivity
If additional columns and equipment are added to enhance oxygen production capacity, then the productivity is improved, but the device complexity increases
Solution Approach 1:
The patent combines multiple functions into integrated units. The main condenser serves both as a condenser for the high-pressure column and an evaporator for the low-pressure column. The auxiliary column and argon removal column share space within the main columns, reducing the number of external components and simplifying the overall system structure.
Solution Approach 2:
The auxiliary column serves multiple purposes: it acts as a condenser for the high-pressure column, provides additional separation capacity, and enables argon removal when equipped with the appropriate top condenser. This multi-functionality reduces the need for separate dedicated equipment, thereby controlling system complexity.
3Volume of moving object
If a compact design is implemented to facilitate transportation, then the system compactness is improved, but the oxygen production capacity is reduced
Solution Approach 1:
The patent transitions from a horizontal arrangement to a vertical arrangement by nesting columns within columns. This dimensional change allows the system to achieve high oxygen production capacity (which would require large horizontal footprint) within a compact vertical footprint suitable for transportation.
Solution Approach 2:
By nesting the auxiliary column inside the high-pressure column and the argon removal column inside the low-pressure column, the system achieves maximum space utilization. This nesting configuration provides high oxygen production capacity while maintaining a compact external volume for transportation.
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 achieves a high oxygen production capacity and energy efficiency by allowing for the recovery of nitrogen and argon products, reducing energy consumption, and enabling the system to be transported in a compact form.
Implementation Method 1
the evaporation space of the main condenser is flow-connected to the low-pressure column
Implementation Method 2
the liquefaction space of the main condenser is flow-connected to the top of the high-pressure column
Implementation Method 3
The heat exchange relationship between high-pressure column and low-pressure column of a double column is generally implemented by a main condenser
Implementation Method 4
a gaseous fraction, the oxygen content of which is equal to that of air or higher, is introduced into the sump region of the auxiliary column... a liquid stream... is introduced as reflux to the top of the auxiliary column
Implementation Method 5
an argon removal column that is flow-connected to an intermediate site of the low-pressure column
Data Source
AI summary
A system and method serve generate oxygen by low-temperature air separation in a distillation column system having a high-pressure column and a low-pressure column, a main condenser which is constructed as a condenser-evaporator, and an auxiliary column. A gaseous oxygen-containing fraction is introduced into the auxiliary column. A nitrogen-containing liquid stream from the high-pressure column, the main condenser or the low-pressure column is applied as reflux to the top of the auxiliary column. An argon-rich stream from an intermediate site of the low-pressure column is introduced into an argon removal column that has an argon removal column top condenser. The low-pressure column is arranged beside the high-pressure column, the main condenser is arranged over the high-pressure column, the auxiliary column is arranged over the main condenser, the argon removal column is arranged over the auxiliary column and the argon removal column top condenser is arranged over the argon removal column.