Drying compressed gas
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Solution Overview
Problem
Existing compressed air drying systems face inefficiencies due to high pressure drops and energy consumption, which can lead to increased operational costs and capital expenditures, while also failing to effectively manage moisture and condensate, causing corrosion and equipment breakdowns.
Innovation Solution
A system comprising a cooler, refrigeration cycle, and multiple adsorption dryers in parallel configuration, where the cooler cools compressed air using a refrigerant, and adsorption dryers using desiccants like silica gel or molecular sieves further reduce moisture to a dew point of -40°C, with a pre-cooler and heaters for efficient operation and flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional refrigeration-based dryers are used to remove water vapor from compressed air, then water content is reduced, but pressure drop increases and system efficiency decreases
Solution Approach 1:
The drying system is segmented into two distinct functional units: a refrigeration-based dryer for initial condensation removal and an adsorption dryer for final moisture removal. This segmentation allows each unit to operate optimally in its designated range, reducing overall pressure drop and energy consumption while achieving the required dew point.
Solution Approach 2:
The refrigeration-based dryer acts as an intermediary that pre-cools and pre-dries the compressed air before it enters the adsorption dryer. This intermediate step reduces the moisture load on the adsorption dryer, allowing it to operate more efficiently with lower pressure drop and reduced energy consumption.
2Productivity
If high capacity dryers are installed to handle multiple compressors, then moisture removal capability increases, but capital costs increase
Solution Approach 1:
The drying capacity is segmented across multiple independent dryer units that can be configured in parallel. Each unit handles a portion of the total compressed air flow, allowing the system to scale with multiple compressors without requiring a single oversized expensive dryer. The modular approach reduces capital costs while maintaining adequate moisture removal capability.
Solution Approach 2:
The dryer system is designed with universal components that can serve multiple compressors. The refrigeration-based dryer and adsorption dryer units are configured to handle aggregate flow from multiple compressors, providing a cost-effective solution that avoids the need for individual dryers for each compressor.
3Reliability
If adsorption dryers are used to achieve low dew point, then moisture removal effectiveness increases, but pressure drop and energy consumption increase
Solution Approach 1:
The refrigeration-based dryer performs preliminary cooling and condensation removal before the air enters the adsorption dryer. This preliminary action significantly reduces the moisture content and temperature of the incoming air to the adsorption dryer, allowing the desiccant to achieve the target dew point with lower pressure drop and reduced energy consumption for regenerating the desiccant.
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 reduces pressure drops and energy consumption, enhances system efficiency, supports multiple compressors and dryer units, and lowers capital and operational costs by effectively managing moisture and condensate, thus minimizing equipment damage and energy usage.
Implementation Method 1
The cooler is configured to cool compressed air received from multiple compressors by exchange with a refrigerant
Implementation Method 2
When air is cooled to a temperature less than the dew point, the water vapor condenses
Implementation Method 3
The refrigeration cycle includes a refrigerant chiller configured to re-cool the refrigerant received from the cooler
Implementation Method 4
The adsorption dryers are configured to remove moisture from the cooled compressed air to form dried compressed air with a dew point of approximately -40°C (-40°F) or below
Data Source
Figure 1A
Figure 1B
Figure 2
AI summary
A system includes a cooler, a refrigeration cycle, one or more receivers, and multiple adsorption dryers. The cooler is configured to cool compressed air received from multiple compressors by exchange with a refrigerant. The refrigeration cycle is in fluid communication with the cooler. The refrigeration cycle includes the refrigerant circulating in the refrigeration cycle. The refrigeration cycle includes a refrigerant chiller configured to re-cool the refrigerant received from the cooler. The one or more receivers are downstream of the cooler and are configured to collect condensate from the cooled compressed air. The adsorption dryers are in parallel downstream of the one or more receivers. The adsorption dryers are configured to remove moisture from the cooled compressed air to form dried compressed air with a dew point of approximately -40°F or below.