Flow Measurement for Emissions Monitoring

Emissions monitoring is a foremost concern at chemical process industries (CPI) facilities. Many factors promote the importance of proper monitoring and amplifying the consequences of failing to do so reliably & accurately. These factors include global climate-change mitigation efforts, company-based environmental, social, & governance (ESG) objectives. Among the implications for the emphasis on emissions, monitoring is of heightened importance to accurately measure gas flow for high boiler and process-heater efficiency. In emissions control and combustion applications, flow meters measure the flow of fuel gas and air to combustion burners within various types of process equipment.
“Understanding Flow Measurement for Emissions Monitoring” discusses regulatory requirements and various flowmeter technologies, as well as the strengths and weaknesses of each.

Flow-Measurement-for-Emissions-Monitoring

Importance of Flow Measurement in Process Gas Emission

Most flue gases emission contains air pollutants that are harmful to human health. So continuous emission monitoring systems (CEMS) are mandatory for providing reporting to state & central pollution control boards for environmental pollution control. It is essential to measure the composition and concentration of polluting gases with mass flow rates to arrive at the total emission discharge in the environment.

Flue Gas Flow Rate Measurement is Imperative For Below

♦ Optimizing ESP performance by maintaining design parameters such as specific collection area, gas velocity, and treatment time within ESP in control.

♦ Indicates early warning for Preheater condenser failures

♦ Help regulates harmful pollutants, dust emission controls

♦ Useful information on optimizing mass balance

♦ Simple design to operate Helps in energy conservation easily

♦ Predictive & preventive measures for optimizing their process efficiency and reducing harmful emissions in the environment.

Flue Gas Flow Rate Measurement Techniques

Differential Pressure Flow Monitors: We can use the Differential pressure technique to measure the Flue Gas flow rate by generating DP (Differential pressure) with the help of S-type Pitot tube. The Pitot probe is constructed of two in-line tubes. The sampling point of the probe consists of two opposing open faces perpendicular to the traverse axis.

This technology is used in numerous gas flow monitoring applications other than flue gas. It is widely used to determine the air speed of an aircraft, water speed of a boat, and to measure liquid, air and gas velocities in industrial applications. The pitot tube is used to measure the local velocity at a given point in the flow stream & not the average velocity in the pipe or conduit.

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Flow Measurement For Emissions Monitoring

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