How Big Is the Gas Flow in Industry

Typical range of industrial gas flow

the gas flow in industry varies greatly due to application scenarios and cannot be summarized by a single value. For example, gas chromatograph carrier gas flow in a small laboratory is usually1-100 mL/min; And the main air compression flow of large air separation unit (oxygen/nitrogen) can reach10 ”-10” m³/h(Standard status). Common industrial processes such as combustion control, chemical reaction feed, flue gas desulfurization, etc., more than flow-rate range10-10⁴ Nm³/h(Standard cubic meters per hour).

Key factors affecting traffic size

• process Type: large processes such as synthetic ammonia and ethylene cracking are much higher than nitrogen purging for food packaging.
• Equipment scale: the difference between a single reactor and a complete set of integrated unit is 3-6 orders of magnitude.
• Gas properties and states: it needs to be converted to the standard state (0°C, 101.325 kPa) conduct comparability assessment
• measurement reference: Volume flow (Nm ³/h), mass flow (kg/h) or molar flow (kmol/h) must be clearly marked

practical Reference Chart

the following figure shows the gas flow in typical industrial scenarios (standard conditions):

Logarithmic scale illustration of industrial gas flow

GC carrier gas
~0.001 Nm³/h

Boiler combustion air
~10²-10³ Nm³/h

Air separation main air flow
~10⁵ Nm³/h

Large refining total exhaust
>10⁶ Nm³/h

The actual selection should be combined with process design documents, instrument range and precision requirements, and comply with ISO 5167, GB/T 21446 and other standards and specifications.