The discharge of flue gas, waste liquid and sewage seriously pollutes the atmosphere and water resources, and seriously threatens the human living environment. The state regards sustainable development as its national policy, and environmental protection will be the biggest subject in the 21st century. To control air and water pollution, management must be strengthened, and the basis of management is quantitative control of pollution. Flowmeters play an irreplaceable role in flue gas discharge, sewage and waste gas treatment flow measurement.
China is a country with coal as its main energy source. There are millions of chimneys all over the country that continuously emit smoke into the atmosphere. Flue gas emission control is an important project to eradicate pollution. Each chimney must be equipped with flue gas analyzer and flowmeter to form a continuous emission monitoring system. There are many difficulties in flue gas flow rate, such as large chimney size and irregular shape, variable gas composition, large flow rate range, dirt, dust, corrosion, high temperature, no straight pipe section, etc.