Two-Stage Vacuum Degassing Device for Low Oxygen Water
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Solution Overview
Problem
Existing degassing methods for water require costly and environmentally impactful stripping gases like carbon dioxide and steam, and involve energy-intensive processes, particularly in industries like the beverage and energy sectors where low oxygen levels are necessary to prevent corrosion and spoilage.
Innovation Solution
A two-stage degassing process in a closed system using vacuum degassing in two containers, where the first container generates a negative pressure slightly above the water's vapor pressure to remove dissolved gases, and the second container creates a vacuum below the vapor pressure to facilitate evaporation and further degassing without the need for external stripping gases, utilizing the natural vapor pressure of water to enhance degassing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If stripping gases like carbon dioxide or steam are used to remove dissolved gases from water, then degassing effectiveness is improved, but operating costs and environmental impact worsen
Solution Approach 1:
The invention extracts and removes the stripping gas from the system by operating in vacuum conditions. The vacuum pump creates negative pressure that draws dissolved gases out of the water without requiring external stripping gases like CO2 or steam, thereby eliminating their associated costs and environmental impacts while maintaining effective degassing
Solution Approach 2:
The system uses its own vacuum generation capability to create the driving force for degassing. The vacuum pump serves the dual purpose of removing dissolved gases and preventing the need for external stripping gases, making the system self-sufficient and eliminating dependency on costly external gas supplies
2Reliability
If steam is used as stripping gas for thermal deaeration, then dissolved gas removal is improved, but energy consumption worsens
Solution Approach 1:
The invention replaces the thermal energy input required for steam generation with a mechanical vacuum system. The vacuum pump mechanically creates negative pressure to drive gas removal, substituting the thermal field with a mechanical field, thereby eliminating the high energy consumption associated with steam generation while achieving effective deaeration
3Productivity
If vacuum pressure is set below vapor pressure to enable evaporation, then degassing efficiency is improved, but water loss increases
Solution Approach 1:
The invention applies partial vacuum (negative pressure slightly above vapor pressure) rather than extreme vacuum conditions. This partial action is sufficient to remove dissolved gases effectively while avoiding the excessive vacuum that would cause significant evaporation and water loss, achieving an optimal balance between degassing efficiency and water conservation
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 method achieves a significant reduction in energy consumption and eliminates the need for costly stripping gases, effectively lowering dissolved oxygen levels in water to below 10 ppb, thereby extending shelf life and reducing corrosion, while maintaining an energetically advantageous process.
Implementation Method 1
the first container generates a negative pressure slightly above the water's vapor pressure to remove dissolved gases
Implementation Method 2
According to Henry's Law, the amount of dissolved gas particles is proportional to the partial pressure in the gas phase of the stripping gas
Implementation Method 3
the second container creates a vacuum below the vapor pressure to facilitate evaporation and further degassing
Implementation Method 4
utilizing the natural vapor pressure of water to enhance degassing efficiency
Data Source
Figure 1
AI summary
The invention relates to a method for degassing dissolved gases from water in a degassing device and to a degassing device. The degassing process is carried out in two stages in a closed system with a first and a second degassing container, both of which operate continuously as inline degassers. In the first container, a vacuum degassing process of the flowing water is carried out, wherein a negative pressure slightly above the given steam pressure P1 of the introduced water is generated by a negative pressure-generating device. In the second degassing container, a negative pressure is generated by the negative pressure-generating device such that the negative pressure in the second degassing container is below the given steam pressure P2 of the water introduced into the second degassing container. In this manner, the introduced water begins to be evaporated. The quantity of the steam released from the water corresponds to the suction power of the negative pressure-generating device which generates the negative pressure and suctions the steam out of the second degassing chamber. Because the partial pressure of the gases in the steam is lower than the partial pressure of the dissolved gases in the water, the dissolved gases diffuse out of the water into the steam.