News

Sewage flowmeters for flow measurement applications in environmental engineering

The rapid increase in population and the rapid development of industrial production have caused the environment to deteriorate seriously and have reached dangerous levels. The country has made sustainable development a national policy and will be the biggest issue in the 21st century. The management of air pollution and water pollution must be strengthened. The basis of management is the quantitative control of pollution. China is a country with coal as its main energy source. There are millions of chimneys in the country that continuously emit smoke to the atmosphere day and night. Flue gas emission control has become an important project to eradicate pollution. In the United States, legislation has been established on the exhaust emission standards for smoke. Each chimney must be equipped with a flue gas analyzer and a sewage flow meter to form a continuous emission monitoring system (CEMS). Smoke exhaust gas flow measurement is a difficult measurement problem, and its difficulty is:
Large diameter, such as an irregular shape of the chimney, a few meters long;
The gas composition varies;
Wide range of flow rates, from very low speeds to high speeds;
Dirty, dust, corrosion;
The flow channel is non-circular in cross-section, with no similarity, and the velocity distribution in the channel is complex;
There is no straight pipe section, the shape of the spoiler is complex, the speed distortion and the rotating flow;
It is impossible to determine the meter factor of the flowmeter by individual calibration;
Static pressure, requiring low pressure loss of the instrument;
High temperature (above 200°C);
Wastewater and sewage discharge have seriously polluted rivers and lakes, which has caused the water resources that have been seriously deficient to be destroyed. The already tight water resources are even worse. The management and control of waste liquid and sewage discharge is an urgent task. However, the waste liquid sewage flowmeter is also a difficult problem in flow measurement because of the dirt, large diameter, special shape, low pressure head, wide flow rate range and dissatisfied pipe flow. The number of flowmeters needed by factory enterprises and people's lives is extremely large, and the types need to be diversified to meet a wide range of needs.
The flowmeters required for environmental protection projects will continue to put forward new requirements along with the in-depth development of the project. For example, large-scale wastewater reclamation equipment, urban waste treatment equipment, and water recycling systems of industrial and mining companies all require a wide range of flowmeters.

PREVIOUS：Instrument Control Flowmeter Manufacturers InNEXT：Instruments such as steam flow meters will us