Enclosure for a column for low-temperature distillation
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Solution Overview
Problem
Low-temperature distillation columns face issues with leakages of cryogenic liquids, which can lead to explosions and equipment collapse, and the toxicity of fluids like carbon monoxide poses additional risks, particularly in offshore air separation units.
Innovation Solution
A tank with pulverulent thermal insulation, such as perlite, is used to contain leakages from a distillation column, allowing carbon steel to be used for the enclosure casing, with a stainless steel or aluminum tank to collect and manage the leaked liquids, and a method for separating mixtures at temperatures below 0°C using a column enclosed in a carbon steel casing with perlite insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the enclosure casing is made from carbon steel, then the manufacturing cost and ease of manufacture are improved, but the risk of explosion and equipment collapse increases due to cryogenic liquid leakage
Solution Approach 1:
The enclosure is segmented into distinct functional zones: an upper safe zone with thermal insulation (perlite) that absorbs cryogenic liquids, and a lower collection zone with a stainless steel tank. This segmentation allows the majority of the enclosure to use cost-effective carbon steel while only critical areas use expensive stainless steel, resolving the contradiction between manufacturing cost and safety.
Solution Approach 2:
Pulverulent thermal insulation (perlite) acts as an intermediary substance between the cryogenic liquid and the carbon steel enclosure structure. It absorbs the coldness and cryogenic liquid, preventing direct contact with the carbon steel casing, thereby maintaining both cost-effectiveness and safety.
2Reliability
If stainless steel is used for the enclosure casing below leaking elements, then the reliability and resistance to cryogenic liquid damage are improved, but the manufacturing cost and weight increase
Solution Approach 1:
The enclosure structure is segmented by material type: carbon steel for the upper casing, stainless steel tank for liquid collection, and aluminum or stainless steel for the skirt. This selective material segmentation reduces overall weight and cost while maintaining reliability in critical areas through functional zoning.
Solution Approach 2:
Different material qualities are applied locally based on functional requirements: carbon steel for general enclosure, stainless steel for the liquid-retaining tank and skirt where cryogenic contact occurs, and aluminum as an alternative. This local quality approach optimizes the balance between weight, cost, and reliability.
3Object-affected harmful factors
If the entire enclosure is made from stainless steel, then the resistance to cryogenic liquid damage and explosion risk are reduced, but the manufacturing cost increases significantly
Solution Approach 1:
The enclosure is segmented into high-risk zones (lower part, liquid collection area) and low-risk zones (upper casing). Only high-risk zones use expensive stainless steel, while low-risk zones use economical carbon steel, achieving cost-effective protection against harmful factors.
Solution Approach 2:
Pulverulent thermal insulation serves as a protective intermediary that absorbs cryogenic liquids and coldness, preventing them from reaching and damaging the carbon steel enclosure structure. This intermediary layer provides resistance to harmful factors without requiring the entire enclosure to be made from expensive stainless steel.
4Ease of manufacture
If carbon steel is used for the enclosure casing, then the manufacturing cost is reduced, but the risk of explosion and equipment collapse due to cryogenic liquid leakage increases
Solution Approach 1:
Pulverulent thermal insulation (perlite) acts as a protective intermediary that absorbs cryogenic liquids and coldness, preventing direct contact with the carbon steel enclosure. This allows the use of economical carbon steel while maintaining resistance to harmful factors through the intermediary protection layer.
Solution Approach 2:
The pulverulent thermal insulation is pre-installed in the upper enclosure to cushion and absorb potential cryogenic liquid leaks before they can reach and damage the carbon steel structure, providing beforehand protection against harmful factors.
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
The solution effectively absorbs and manages cryogenic liquid leaks, preventing heat transfer and allowing the use of carbon steel for the enclosure, reducing the risk of explosions and equipment damage while enabling safe separation of hazardous mixtures.
Implementation Method 1
the liquid from the leakages is partially absorbed by the pulverulent insulation, for example perlite, such that the coldness of the liquid is not transferred to the structure of the enclosure
Implementation Method 2
an enclosure insulated with perlite
Data Source
AI summary
An enclosure for a column for low-temperature distillation comprises a distillation column, which has a circular cross section and is to be thermally insulated, the column containing liquid during use, at least one pipe attached to the column for transporting a liquid, a parallelepipedal casing enclosing the column in a sealed manner, pulverulent thermal insulation filling the space between the column or columns and the casing, a liquid-retaining tank, which has a flat bottom and four side walls, defining a liquid-retaining space, the tank being arranged inside the casing below the column in order to collect liquid that has leaked from the column, the tank being made from stainless steel or from aluminium and the casing being made from carbon steel, the column resting on the bottom of the tank through a skirt, the skirt being a cylinder made from stainless steel and having the same diameter as the column, the liquid-retaining space containing pulverulent thermal insulation.