Natural gas relief
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Natural Gas Relief Systems: Key Insights and Developments
Steady-State Simulation for Natural Gas Pressure-Relieving Systems
Natural gas pressure-relieving systems are crucial for maintaining the safety of pipelines and equipment by preventing overpressure. A recent study proposed a steady-state simulation model that integrates hydrodynamic and thermodynamic equations for pipe elements and characteristic equations for resistance elements like valves and bends. This model can predict pressure, flow rate, and temperature under both critical and subcritical conditions. The model's reliability was validated with experimental data, showing minimal errors in temperature and flow rate predictions, making it a robust tool for various pressure-relieving systems without branches1.
Influence of Natural Gas Composition on Ultrasonic Flow Measurement
The composition of natural gas significantly impacts the accuracy of flow rate measurements in pressure relief flare systems. Research has shown that the maximum error in ultrasonic flow measurement due to unknown gas composition is only 0.04%. However, gas samples collected directly from flare systems may not accurately represent the actual gas composition, leading to negligible errors in total gas volume calculations. This finding underscores the importance of accurate gas composition data for reliable flow measurements in pressure relief systems2.
Pressure-Relief Gas Extraction in Multi-Coal Seam Mining
In multi-coal seam mining regions, a technical model for pressure relief gas extraction has been developed based on simultaneous coal and gas extraction theory. This model effectively reduces gas pressure in outburst-prone coal seams, facilitating safe and efficient gas discharge. Field investigations confirmed that this method significantly reduces gas extraction time and drilling workload, demonstrating its effectiveness in enhancing safety and productivity in mining operations3.
Evaluating Pressure-Relief Mining Performances
Pressure-relief coal mine methane (CMM) surface gas ventholes (SGVs) are essential for exploiting CMM and preventing outbursts. Analyzing data from multiple SGVs, researchers developed a model to predict gas flow rates and evaluate the performance of pressure-relief mining. The study identified three stages of gas flow rate evolution: sharp rise, decline, and stable stages. The results indicated that pressure-relief mining significantly enhances gas extraction, increasing volumes by up to 328.67 times compared to direct extraction methods4.
Designing Gas/Vapor Relief Systems with Rupture Disks
Designing gas/vapor relief systems, particularly those involving rupture disks, can be complex. A new method simplifies this process by providing a direct way to identify choking conditions without trial-and-error calculations. This method, validated through case studies, streamlines the design of vent piping for rupture disks, ensuring the adequacy of emergency relief systems and protecting process vessels from overpressure5.
Stress-Damage-Flow Coupling Model for Deep Coal Seam Gas Drainage
A coupled stress-damage-flow model has been developed to improve gas drainage in deep coal seams with low permeability. This model integrates stress evolution, damage, and gas permeability changes with coal and rock deformation. Numerical simulations showed significant stress relief and increased gas permeability in target coal seams, aligning well with field observations. This technology enhances safety and productivity in underground coal mines, particularly in regions with multiple low-permeability coal seams6.
Flow Erosion and Displacement in Gas Well Relief Lines
High-pressure, particle-laden gas flows in relief lines can cause erosion and vibration, posing safety risks. Using computational fluid dynamics (CFD), researchers investigated factors affecting erosion and displacement in relief lines. The study found that higher inlet flow rates and smaller pipe diameters lead to greater erosion and displacement. Additionally, sand particles have a more significant impact on erosion than liquid droplets, highlighting the need for careful consideration of flow characteristics in relief line design8.
Conclusion
The advancements in natural gas relief systems, from simulation models to practical design methods, significantly enhance the safety and efficiency of gas extraction and pressure relief operations. These developments ensure reliable performance under various conditions, contributing to safer and more productive industrial and mining environments.
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Most relevant research papers on this topic
A steady state simulation method for natural gas pressure-relieving systems
The steady-state simulation model for natural gas pressure-relieving systems accurately predicts pressure, flow rate, and temperature, with minimal errors compared to experimental data.
Evaluation of the Influence of the Composition of Natural Gas in the Ultrasonic Measurement of Flow in Flare-type Pressure Relief Systems
Ultrasonic measurement of gas flow rate in pressure relief flare systems has a maximum error of 0.04% when the actual gas composition is unknown, and collected gas samples may not represent the actual measured gas.
Technical scheme and application of pressure-relief gas extraction in multi-coal seam mining region
The proposed pressure-relief gas extraction technical model effectively reduces extraction time and drilling work load in multi-coal seam mining regions, ensuring quick and safe gas discharge.
Evaluating pressure-relief mining performances based on surface gas venthole extraction data in longwall coal mines
Pressure-relief mining significantly enhances gas extraction in longwall coal mines, increasing extraction volumes by 328.67 times compared to direct extraction without pressure-relief mining.
Highly CitedAn easy method to design gas/vapor relief system with rupture disk
This paper presents an easy and quick method to identify choking of gas flow in emergency relief systems, simplifying design calculations and validating venting adequacy.
Stress-damage-flow coupling model and its application to pressure relief coal bed methane in deep coal seam
Long-distance pressure relief gas drainage technology effectively improves safety and productivity in underground coal mines, especially in areas with multiple low permeability coal seams.
Highly Cited