Multistage Pressure Regulator for Dew Point Dropout Prevention
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Solution Overview
Problem
Existing vapor gas sampling systems face challenges in maintaining accurate pressure regulation to prevent dew point dropout and ensure compositional integrity during the depressurization of natural gas samples, leading to potential analyzer damage and inaccurate BTU measurements.
Innovation Solution
A compact, adjustable, and calibratable multistage pressure regulating device that dynamically adjusts pressure stages using electro-mechanical adjustment devices and thermal control to maintain vapor samples within the vapor phase, preventing condensation and ensuring accurate analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single-stage pressure reducing regulator is used, then the device complexity is reduced, but the measurement precision of BTU measurements deteriorates due to inaccurate pressure regulation and potential dew point dropout
Solution Approach 1:
The pressure reduction process is divided into multiple stages, with each stage reducing pressure by a controlled amount. This segmentation allows precise pressure control at each step, preventing dew point dropout and maintaining compositional integrity, thereby ensuring accurate BTU measurements while avoiding the complexity of a single overly-complex regulator
2Productivity
If pressure reduction is applied too aggressively, then the productivity of sample analysis is improved, but the reliability of the system deteriorates due to analyzer damage from liquid condensation
Solution Approach 1:
The multistage regulator performs preliminary pressure reduction in controlled steps before the sample reaches the analyzer. By pre-reducing pressure through multiple stages with thermal control, the system prevents condensation and liquid formation upstream, protecting the analyzer from damage while enabling continuous high-productivity operation
3Ease of operation
If a fixed pressure regulation system is used, then the ease of operation is improved, but the adaptability to various gas profiles deteriorates
Solution Approach 1:
The regulator incorporates adjustable parameters that allow optimization for different gas compositions and flow conditions. Each stage can be independently configured to accommodate varying gas profiles, maintaining ease of operation through standardized adjustment mechanisms while achieving high adaptability to different natural gas samples
4Stability of the object's composition
If thermal control is applied during pressure reduction, then the compositional integrity is maintained by preventing condensation, but the use of energy increases
Solution Approach 1:
Thermal control is applied segmentally at each pressure stage rather than continuously throughout the entire pressure reduction process. This segmented approach maintains vapor temperature above dew point at each stage, preserving compositional integrity while minimizing total energy consumption by applying heat only where and when needed
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 provides reliable and precise pressure regulation, preventing dew point dropout and maintaining compositional integrity, thereby ensuring accurate BTU measurements and reducing the risk of analyzer damage, while being adaptable to various gas profiles and applications.
Implementation Method 1
avoids Joule-Thomson/dew point dropout condensation while maintaining the compositional integrity of the vapor throughout the depressurization process
Implementation Method 2
a thermal control means for maintaining thermal stability of the regulator body
Data Source
AI summary
A multi-stage pressure regulation system, device and associated methodology for reducing the pressure of gas passing through a gas sample conditioning system. The device and method allow for automatic and/or manual configuration settings for regulating different types of gas having different profiles while still avoiding dew point dropout thereby ensuring accurate sample analysis at a downstream analyzer. The pressure regulating device includes a housing having a core, a vapor sample input port, a plurality of openings on an upper surface, a plurality of pressure regulating valves configured to reduce the pressure of a vapor sample, and an assembly having a base and substantially central stem orthogonal to the base and extending axially therefrom, the stem being disposed within the core.