Measuring the Velocity and Flow of Gas Flows in Chimneys

Measuring the Velocity and Flow of Gas Flows in Chimneys

With the conversion from direct electricity and fossil fuels to bioenergy-based heating systems, there is increasing interest in determining the efficiency of heating boilers and characterizing and measuring emissions such as carbon monoxide, hydrocarbons, nitric oxides and particulates.

Especially in the case of solid fuel boilers, methods are developed to measure efficiency and emissions on an annual basis and solutions are sought to improve these systems. Continuous measurement of flue gas flow rate is required to quantify emissions under dynamic conditions.

For continuous dynamic flue gas flow measurements, a single point velocity pressure measurement is made with a standard S-type pitot-static tube and a certain velocity profile is assumed based on the initial cross-measurements.

TS ISO 10780 Point source emissions - Measurement of velocity and flow of gas flows in pipes.

This standard describes manual methods for determining the velocity and volumetric flow rate of gas flows in air ducts, chimneys and chimneys. This standard applies to gas flows with essentially constant density, temperature, flow rate and pressure at the sampling point.

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