Dual Desiccant Tower Compressed Gas Drying System
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Solution Overview
Problem
Heat of compression dryer systems require frequent offline recharging and regeneration, leading to inefficiencies and potential dew point spikes, which disrupt the flow of dry compressed gas and can affect downstream equipment.
Innovation Solution
A system with two desiccant towers and a minimal number of valves (no more than ten) allows for seamless regeneration of one tower while the other dries compressed gas, minimizing pressure drop and maintaining consistent dew point by pre-cooling the regenerating tower and using a controlled flow path to ensure continuous operation without spikes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single desiccant tower is used in heat of compression dryer systems, then the system structure is simple, but the system requires frequent offline recharging and regeneration, leading to disruption of dry compressed gas flow and potential dew point spikes
Solution Approach 1:
The single desiccant tower is divided into two separate towers (first desiccant tower and second desiccant tower). One tower operates in drying mode while the other undergoes regeneration, allowing continuous operation without interruption to the dry compressed gas flow. This segmentation eliminates the need for offline recharging and prevents dew point spikes.
2Ease of operation
If multiple valves are used to control flow paths for regeneration, then the regeneration process can be controlled, but the number of components increases and pressure drop increases
Solution Approach 1:
The system merges the flow control functions into a minimal valve arrangement where valves control the diversion of compressed gas flow between the two towers. Instead of using multiple valves for complex control, the system uses a streamlined valve configuration that achieves the necessary flow path control with fewer components, reducing pressure drop and simplifying the overall system.
3Adaptability or versatility
If compressed gas flow passes through multiple valves during operation, then flow direction can be changed, but pressure drop increases
Solution Approach 1:
The system pre-cools the compressed gas before it enters the desiccant towers and pre-conditions the regenerating tower with cooled compressed gas. This preliminary action optimizes the drying efficiency and allows for smoother flow transitions through the valves, reducing turbulence and pressure drop while maintaining effective flow direction control.
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 system ensures continuous operation of the compressed gas dryer with minimal pressure drop and no dew point spikes, maintaining consistent dryness and efficiency by reducing the number of valves and optimizing the flow path for regeneration.
Implementation Method 1
a drying compound that interacts with the gas being dried to remove moisture from the flow
Implementation Method 2
employ the heat of compression to regenerate the cooled tower
Implementation Method 3
a cooler positioned downstream of the compressor to cool the compressed gas prior to passage through the towers
Data Source
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AI summary
A gas compressing system includes a compressor that provides a flow of compressed gas, a first desiccant tower, and a second desiccant tower separate from the first tower. The system also includes a first separator, a second separator separate from the first separator, an outlet, a first set and second set of no more than three valves each movable between an open position and a closed position. The flow flows along a flow path from the compressor to the first tower, to the first separator, to the second tower and out the outlet when the first set of valves is open and the second set of valves is closed. The flow of compressed gas flows from the compressor to the second tower, to the second separator, to the first tower and out the outlet when the first set of valves is closed and the second set of valves is opened.