Two-Column Compressed Gas Dryer With Heated Regeneration Control
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Solution Overview
Problem
Existing dehumidification systems for compressed air are either costly to manufacture or require high compressed air consumption, limiting their operational efficiency and economy.
Innovation Solution
A hybrid dehumidification apparatus utilizing two columns of adsorbing material with a four-way valve and heating element, implementing alternating adsorption and regeneration cycles to optimize energy use and reduce air consumption, while ensuring efficient moisture removal and regeneration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hot-type regeneration is used, then dehumidification effectiveness is improved, but manufacturing cost increases
Solution Approach 1:
The system divides the dehumidification process into two separate columns: one for adsorption (dehumidification) and one for regeneration. This segmentation allows each column to perform its specific function optimally, achieving effective dehumidification while using a simpler, less expensive regeneration approach compared to hot-type regeneration systems.
Solution Approach 2:
The patent introduces an intermediary heat exchanger that transfers heat from the outgoing regenerated air to the incoming compressed air. This intermediary mechanism enables efficient heat recovery and preheating of the regeneration gas without requiring external high-temperature heating sources, thereby reducing manufacturing costs while maintaining dehumidification effectiveness.
2Ease of manufacture
If cold-type regeneration is used, then manufacturing cost is reduced, but compressed air consumption increases
Solution Approach 1:
The system maintains continuous dehumidification by operating two columns in alternating phases. While one column is in adsorption mode, the other undergoes regeneration. This continuity ensures that compressed air is always being dehumidified without interruption, optimizing the use of compressed air and reducing overall consumption compared to systems that require complete shutdowns for regeneration.
Solution Approach 2:
The patent employs automatic control means that monitor the dehumidification process and regulate the switching between adsorption and regeneration phases. This feedback mechanism optimizes the timing and duration of each phase, ensuring that regeneration occurs only when necessary and that compressed air consumption is minimized while maintaining effective dehumidification.
3Productivity
If two-column alternating system is used, then operational continuity is improved, but device complexity increases
Solution Approach 1:
The system uses a four-way valve that performs multiple functions: directing compressed air to either column, routing the dried air output, and controlling the regeneration gas flow path. This multi-functional component achieves operational continuity without requiring separate complex control systems for each function, thereby limiting the increase in device complexity.
Solution Approach 2:
The patent combines the regeneration heat exchanger and the main dehumidification flow path into an integrated system where heat exchange occurs between streams without direct mixing. This merging of functions achieves operational continuity while reducing the number of separate components compared to systems with independent regeneration and dehumidification circuits.
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 apparatus achieves significant operating economy and simplicity by optimizing the adsorption and regeneration cycles, reducing energy consumption, and minimizing the drawbacks of previous systems, such as high costs and excessive air usage.
Implementation Method 1
a second stage that uses the method of removing the residual humidity through the passage of the compressed air, flowing out of the first stage, through one or more 'beds' or columns of adsorbing substances that intercept and capture the residual humidity
Implementation Method 2
it is crossed by a second flow of gas, which is much dryer and at a conveniently high temperature so that it extracts the moisture previously captured by said adsorbing substances
Implementation Method 3
the well-known method of making said air flow through the first branch of a heat exchanger, the second branch of which (generally an evaporator) is crossed by a strongly cooled refrigerant
Implementation Method 4
which uses as a method for cooling the air (and the consequent removal of the resulting condensation)
Data Source
AI summary
Hybrid apparatus for drying compressed gas and including an adsorption dryer with first and second columns and an outflow device for the dried gas therefrom, a first diverting device to convey the compressed gas toward and through the first and second columns, a second diverting device to convey toward a downstream connected device the compressed gas coming from the first or second column, in which is arranged the command and control device to implement an adsorption cycle and a regeneration cycle that includes, for each column, an initialization, gas exhausting, regeneration, cooling and pressurization phases, and in which the initialization phase includes the determination of an assigned time within which subsequent phases must be maintained; the regeneration phase including tapping previously heated gas from the first column and feeding it into the second. The apparatus also includes a heating device connected to the second diverting device for the regeneration phase.