Hydrogen Solubility Measurement With Dynamic Piston Pressure Control
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Solution Overview
Problem
Existing methods for measuring hydrogen solubility and competitive dissolution in formation water are flawed due to temperature-dependent volume changes causing pressure errors and inability to isolate gases, leading to inaccurate results and backflow during vacuumizing.
Innovation Solution
A measurement apparatus with a gas dissolution mechanism using heat-insulated boxes, piston plates, and controlled gas transport pipes to maintain preset pressures and isolate gases, combined with a desorption mechanism for accurate hydrogen and competitive gas solubility determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If formation water is directly introduced into a constant volume reaction vessel for gas solubility measurement, then the measurement process is simplified, but temperature increase causes water vapor conversion and volume expansion leading to pressure errors and inaccurate results
Solution Approach 1:
The system is divided into separate functional modules: a dissolution cylinder for gas-liquid contact, a reaction vessel for measurement, and a heat-insulated box for temperature control. This segmentation allows each component to perform its specific function optimally while avoiding the problems of direct constant-volume measurement.
Solution Approach 2:
A piston plate is introduced as an intermediary component between the formation water and the gas phase. The piston plate moves freely to accommodate volume changes of the formation water due to thermal expansion, thereby maintaining constant pressure conditions and eliminating pressure errors in solubility measurements.
2Reliability
If vacuumizing is performed to isolate gas from formation water, then gas isolation is achieved, but formation water backflows making multi-component gas competitive dissolution experiments impossible
Solution Approach 1:
The piston plate serves as a one-way valve mechanism that allows gas to be isolated from formation water during vacuumizing, while preventing formation water from backflowing into the gas phase. This enables effective gas isolation without compromising the ability to perform multi-component gas competitive dissolution experiments.
3Stability of the object's composition
If formation water volume expansion due to thermal expansion is allowed, then natural behavior is maintained, but the volume occupied by gas phase is reduced causing experimental errors
Solution Approach 1:
The piston plate acts as a movable boundary that allows formation water to expand thermally while maintaining a constant total system volume. As the piston plate moves, it accommodates the volume expansion of formation water without compressing the gas phase, thereby maintaining accurate gas phase volume measurements.
Solution Approach 2:
The system transitions from a static constant-volume design to a dynamic system where the piston plate can move freely. This dynamic adjustment allows the system to adapt to thermal expansion of formation water while maintaining measurement accuracy, as the piston plate position changes compensate for volume changes.
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
Accurately measures hydrogen solubility and competitive dissolution under varying temperatures by preventing volume changes and backflow, ensuring precise experimental results.
Implementation Method 1
as a temperature increases, the formation water will be converted into water vapor, affecting pressure of the reaction vessel, and also will expand to reduce a volume occupied by a gas phase
Implementation Method 2
a gas dissolution mechanism, where the gas dissolution mechanism includes a heat-insulated box
Data Source
AI summary
A measurement apparatus for hydrogen solubility and competitive dissolution of multi-component gases includes a gas dissolution mechanism, and the gas dissolution mechanism includes a heat-insulated box. A first piston plate and a second piston plate are slidably connected in a dissolution cylinder and a gas cylinder, respectively, a middle part of the first piston plate is connected to a gas transport pipe, and the gas transport pipe can connect upper and lower spaces of the first piston plate. The apparatus can clearly determine partial pressure generated by conversion of the formation water into the water vapor, and maintains preset partial pressure of hydrogen through dynamic adjustment by the second piston plate to eliminate an error caused by the change in a volume of the formation water. The first piston plate isolates a gas from the formation water to prevent the backflow of the formation water during gas replacement and vacuumizing.