Gas Density Monitor Using Low-GWP Reference Gas and Spring Compensation
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Solution Overview
Problem
Density monitors using mechanical measuring principles with a reference volume are not environmentally friendly due to their reliance on greenhouse gases like SF6 for temperature compensation.
Innovation Solution
A density monitoring method and device that uses a closed reference volume filled with a reference gas having a global warming potential less than 100, with increased pressure compared to the noxious gas, and compensates for the resulting force on the partition wall using a spring device, allowing for detection of gas density deflections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a reference volume filled with noxious gas (e.g., SF6) is used for temperature compensation in density monitors, then temperature compensation accuracy is improved, but environmental harm increases due to high global warming potential
Solution Approach 1:
The patent introduces a reference volume filled with inert gas (nitrogen or noble gases like argon, krypton, or xenon) as an intermediary substance to replace the noxious SF6 gas in the density monitor. This intermediary gas provides the necessary temperature compensation function while having zero or negligible global warming potential, thus resolving the contradiction between measurement precision and environmental harm
Solution Approach 2:
The patent changes the physical parameters of the reference gas system by using inert gases with different molecular weights and thermal properties compared to SF6. The reference volume is filled with these alternative gases at appropriately adjusted pressures to maintain the temperature compensation functionality while eliminating the harmful environmental effects of SF6
2Object-affected harmful factors
If the reference volume is filled with inert gas at increased pressure to replace noxious gas, then environmental friendliness is improved, but the force on the partition wall increases requiring additional compensation
Solution Approach 1:
The patent applies counterbalancing spring elements that exert an opposing force on the partition wall to compensate for the increased force generated by the high-pressure inert gas in the reference volume. These springs are pre-loaded or adjustable to provide the necessary counterforce, allowing the system to use environmentally friendly high-pressure gas while maintaining mechanical equilibrium
Solution Approach 2:
The patent incorporates adjustable or temperature-compensated spring mechanisms that can dynamically adapt their force output to match changing conditions in the reference volume. This dynamic adjustment allows the system to maintain balance across different temperatures and pressure conditions while using inert gas at elevated pressures
3Force
If spring devices are added to compensate for increased reference gas pressure, then force balance is improved, but device complexity increases
Solution Approach 1:
The patent designs the spring compensation mechanism to be self-adjusting through thermal expansion and contraction, or self-regulating through the mechanical interaction between the spring and the partition wall. The spring automatically adjusts its force to maintain balance as conditions change, eliminating the need for complex external control systems or frequent manual adjustments
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 environmentally friendly density monitoring of noxious gases by reducing the reliance on high-global-warming-potential gases and maintaining accurate temperature compensation, while also reducing manufacturing and operational costs.
Implementation Method 1
compensating, by means of a spring device, for a force acting on the partition wall as a result of the increased reference gas pressure
Implementation Method 2
detecting a deflection of the partition wall for monitoring the gas density
Data Source
AI summary
In order to mechanically monitor a gas density of a greenhouse gas in a more climate-friendly and cost-effective manner, the invention provides a density monitoring method for monitoring the gas density of a noxious gas (10), comprising: a) providing a closed reference volume (26) with a partition wall (28) movably disposed between the reference volume (26) and the noxious gas (10) to be monitored, b) providing a reference gas (56) which has a lower global warming potential relative to the noxious gas (10) by at least a factor of two in the reference volume (26) at a reference gas pressure which is higher than the filling pressure of the noxious gas (10), c) compensating, by means of a spring device (32), for a force acting on the separation wall (28) due to the increased reference gas pressure in the reference volume (26), and d) detecting a deflection of the partition wall (28) for monitoring the gas density. A gas density monitor (14), its use in such a method and an electrical system provided therewith are also proposed.