Argon Recondensing Cold Box for Gravity-Fed Vapor Recovery
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for recovering argon vapors are limited in plants without integrated heat exchangers and are impractical for locations without access to distillation columns, as they rely on returning vapors to air distillation columns for condensation.
Innovation Solution
An autonomous argon recondensing unit within a sealed, insulated cold box equipped with a brazed aluminum heat exchanger, where gaseous argon is cooled by pressurized liquid nitrogen to condense back into liquid, which can then flow by gravity to storage tanks, with all valves and instrumentation located outside for easy maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If argon vapors are sent back to air distillation column for condensation, then argon recovery is achieved, but the method is inapplicable to locations without distillation columns and reduces operational versatility
Solution Approach 1:
The invention separates the argon condensation function from the air distillation column by creating a standalone recondensing unit. This unit contains its own heat exchanger and insulation system, allowing it to operate independently without requiring the complex distillation column infrastructure.
Solution Approach 2:
The invention introduces an intermediary cooling medium (typically water or air) to replace the direct integration with distillation column cold streams. This intermediary enables heat exchange for argon condensation without requiring connection to the distillation column system.
2Productivity
If integrated heat exchangers cooled by liquid nitrogen are used, then argon vapor condensation is effective, but the system complexity increases and not all plants have this equipment
Solution Approach 1:
The recondensing unit is designed with a universal heat exchanger system that can utilize various cooling sources (water, air, or other cold streams) rather than requiring liquid nitrogen specifically. This makes the system adaptable to different plant configurations and eliminates the need for specialized liquid nitrogen infrastructure.
Solution Approach 2:
The unit is designed to be self-contained with all necessary components (heat exchanger, insulation, piping) integrated into a single package that can operate autonomously without requiring connection to the main distillation plant's complex cooling systems.
3Ease of repair
If cold box requires internal access for maintenance, then heat exchanger and piping can be accessed, but operational time and safety risks increase
Solution Approach 1:
The invention extracts the maintenance-requiring components (heat exchanger, piping, instrumentation) from the insulated cold box enclosure and relocates them to an accessible position outside the insulation. This allows maintenance personnel to service these components without breaking the thermal insulation or entering the confined cold space.
Solution Approach 2:
The insulation system is designed as a sealed enclosure (cold box) that maintains thermal integrity while allowing external access to components. The insulation shell acts as a protective barrier that can be configured to provide external mounting surfaces for maintenance-accessible components.
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
Effectively recovers and recondenses argon vapors at loading and unloading sites, regardless of distillation plant equipment or location, by using a self-contained system that minimizes heat gain and allows for gravity-fed condensate return, enhancing operational efficiency and safety.
Implementation Method 1
a stream of gaseous argon enters the heat exchanger to be cooled down below its liquefaction point by a stream of pressurized liquid Nitrogen entering the heat exchanger
Implementation Method 2
gaseous argon is gradually cooled down until it is condensed into liquid
Implementation Method 3
the cold box is insulated to prevent heat gains from the ambient atmosphere
Implementation Method 4
the cold box can be physically elevated above the liquid argon storage tank to allow condensed argon to flow back by gravity to the storage tank
Data Source
AI summary
An apparatus for condensing argon can include cold box, which is preferably sealed and largely maintenance free, where all instruments and valves requiring routine maintenance are to be located outside, a nitrogen separator disposed within the cold box, a heat exchanger disposed within the cold box, the heat exchanger is configured to condense a gaseous argon stream against a pressurized liquid nitrogen stream. The cold box is elevated as compared to an argon storage vessel, such that the condensed argon stream can flow to the argon storage vessel without the need for a pump.