Converting 25MMscfd of Natural Gas to kg/hr: A Comprehensive Guide

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SUMMARY

This discussion focuses on converting 25 million standard cubic feet per day (MMscfd) of natural gas to kilograms per hour (kg/hr). The molecular weight of the natural gas is calculated to be 18.94 g/mol, with feed conditions set at 6900 kPa and 298 K. The conversion process involves using the formula for mass flow, which is derived from the standard density and volumetric flow rate. The standard volumetric flow rate is established as 25 MMscfd, and the standard density is calculated based on the molecular weight of natural gas relative to air.

PREREQUISITES
  • Understanding of gas properties, specifically molecular weight and density
  • Familiarity with standard cubic feet per day (MMscfd) as a volumetric flow unit
  • Knowledge of basic thermodynamic principles, including pressure and temperature effects
  • Ability to perform unit conversions and apply formulas for mass flow calculations
NEXT STEPS
  • Research the calculation of standard density for various gases
  • Learn about the effects of pressure and temperature on gas density
  • Explore advanced gas flow measurement techniques
  • Study the implications of gas composition on conversion calculations
USEFUL FOR

Engineers, process designers, and anyone involved in natural gas processing or conversion calculations will benefit from this discussion.

Yr11Kid
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Hi everyone

i need help converting 25MMscfd of natural gas to kg/hr
i calculated the molecular weight of the natural gas to be 18.94g/mol
the feed conditions are 6900kPa and 298K

i'm pretty sure 1MMscfd = 1180m^3/hr at standard conditions, I'm not sure how to work this out for the feed conditions
 
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You can directly compute your mass flow in kg/hr as follows:

mass flow = standard density X standard volumetric flow rate.

Your standard volumetric flow rate is given as 25 MMscfd

You can figure the standard density from your molecular weight:

standard density = [ MW (natural gas) / MW (air) ] X standard density of air.
 

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