Inline Gas Injection Sparger Design for Consistent Liquid Saturation
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Solution Overview
Problem
Existing methods for injecting gases like nitrogen into liquids, such as coffee, face challenges in maintaining consistent gas concentration and preventing foam formation due to the poor bonding of nitrogen with water and the instability of gas solutions under pressure changes.
Innovation Solution
A gas injection device with a porous sparger that injects gas into a flowing liquid under controlled pressure conditions, using a sparger with a porous surface and a backpressure device to maintain consistent gas concentration and prevent liquid clogging, along with a pressure detection and regulation system to manage flow rates and pressures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If gas is injected into liquid using conventional methods, then gas can be introduced into the liquid, but consistent gas concentration cannot be maintained and foam formation occurs
Solution Approach 1:
The patent employs a porous sparger element with controlled pore sizes (1-100 micrometers) to inject gas into the liquid. The porous structure creates numerous small bubbles that increase gas-liquid contact area, enabling consistent gas concentration (5-50% saturation) while preventing foam formation through controlled bubble dissolution. This directly resolves the contradiction by providing precise gas concentration control without the instability and foaming issues of conventional injection methods.
Solution Approach 2:
The system dynamically adjusts operating parameters including gas pressure (1-100 PSI), liquid flow rate (1-100 mL/min), and sparger pore size selection to maintain optimal gas concentration. By changing these parameters in response to flow conditions, the system achieves consistent gas saturation levels while preventing foam formation, thereby resolving the reliability issue.
2Quantity of substance
If pressure is increased to maintain gas in solution, then gas concentration can be maintained, but foam forms when pressure changes
Solution Approach 1:
The porous sparger creates fine bubbles (1-100 micrometers) that dissolve controllably in the liquid stream. This porous injection method allows gas to be introduced at elevated pressures while preventing foam formation through the controlled dissolution mechanism inherent to the porous structure, directly addressing the foam generation problem.
Solution Approach 2:
The system uses pulsing gas injection through the porous sparger at controlled frequencies to maintain gas concentration without continuous high-pressure injection. This periodic action prevents pressure buildup that leads to foam formation while maintaining adequate gas saturation levels in the liquid.
3Quantity of substance
If gas injection rate is increased to achieve desired concentration, then gas concentration improves, but liquid clogging of sparger occurs
Solution Approach 1:
The porous sparger design with interconnected pores (1-100 micrometers) prevents liquid clogging by allowing liquid to pass through the porous structure without blocking the gas flow paths. The porous material structure inherently resists clogging while maintaining effective gas injection rates for achieving 5-50% gas saturation.
Solution Approach 2:
The sparger features non-uniform pore size distribution with different pore sizes in different regions to optimize gas injection while preventing clogging. Larger pores provide liquid flow paths that resist clogging, while smaller pores provide effective gas dissolution, creating local quality variations that solve both problems simultaneously.
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 enables efficient and repeatable injection of gases into liquids, maintaining consistent gas concentration and preventing foam formation, ensuring consistent dispense quality and extended sparger life.
Implementation Method 1
A sparger with a porous surface is provided and positioned in the flow channel such that the liquid flows across the porous surface and the gas is injected into the liquid through the porous surface
Implementation Method 2
the gas is injected into the liquid through the porous surface as the liquid flows across the porous surface
Data Source
AI summary
A gas injection system for injecting a gas into a liquid to form a solution includes a flow channel that conveys a liquid from an upstream inlet configured to receive the liquid and a downstream outlet configured to dispense the solution, sparger positioned in the flow channel, a solution pressure detection device configured to sense a pressure of the solution in the flow channel, and a liquid valve configured to regulate flow of the liquid in the flow channel based on the pressure sensed by the solution pressure detection device. The sparger is configured to inject the gas into the liquid through the porous surface as the liquid flows across the surface.