Recommendations for flue gas flow measurement

Project Overview

First, let’s introduce flue gas. Flue gas is a mixture produced during combustion or pyrolysis. It is usually composed of three forms of substances: solid, liquid and gas. Its composition is complex and diverse, depending on the burning substance (such as coal, oil, natural gas or other organic fuels) and the combustion conditions (such as temperature, oxygen supply, etc.).

It can be seen from the background of flue gas generation that a flow meter that can withstand high temperature and high pressure must be selected for flue gas flow measurement. Moreover, flue gas is composed of a mixture of various forms of substances and contains a variety of impurities. Special attention should be paid when selecting a flow meter.

For media with complex working conditions like flue gas, be sure to consult the manufacturer for advice. Supmea flow engineers have been working in the flow field for many years and have the following suggestions for flue gas flow selection:

1. Choose the appropriate measurement technology:

For high flow rates and relatively stable flows Field conditions can be measured using throttling devices. This method calculates flow rate and flow rate by measuring the pressure difference in the flue.

In the case of low flow rate or unstable flow field (such as the presence of eddy currents and fluctuations), the ultrasonic transit time method is an ideal choice. It uses the time difference between the upstream and downstream propagation of ultrasonic waves in the gas to determine the flow rate.

2. Consider the working conditions:

Fume gas temperature: High-temperature flue gas may require sensors made of high-temperature resistant materials.

Viscous dust and corrosiveness: If the flue gas contains a large amount of dust or is highly corrosive, you need to choose equipment that can adapt to such harsh environments to avoid clogging or damaging the sensor.

3. Calibration and maintenance:

Calibrate measuring instruments regularly to ensure accurate and reliable measurement data.

Clean the sensor to prevent dust accumulation from affecting measurement accuracy.

4. Parameter conversion and compensation:

According to the physical state of the flue gas (humidity, temperature, pressure), the measured working condition flow rate is converted into the flow rate under the standard state. To facilitate comparison and comply with environmental regulations.

5. System integration and continuous monitoring:

Integrate the flue gas flow meter with other related parameters (such as flue gas composition, temperature, pressure) monitoring system to achieve continuous and online Data collection and processing are conducive to real-time optimization of process flow and meeting environmental monitoring needs.

6. Compliance check:

Ensure that the selected measurement methods and equipment comply with the requirements of the local environmental protection department or international standards, such as relevant standards established by ISO, EPA, etc.

In short, when selecting a flue gas flow measurement solution, multiple factors should be fully considered.