Boiler combustion in a thermal power plant affects the running safety and economical efficiency of the electric power plant to a large extent. Combustion is controlled and adjusted with purpose and plan so as to realize the best running mode for the boiler. Main parameters affecting the combustion condition are measured correctly. Primary air, air quantity of secondary air and primary air coal dust concentration are major factors affecting the combustion.

Therefore, primary and secondary air parameters of the electric power plant are adjusted reasonably according to factors including boiler load situation, burner form and coal kind. The key for realizing economical efficiency, environment protection and safe operation is establishing excellent air power condition in the furnace .

The AFMS system consists of a world's advanced bullet-head sensor, an AM series of intelligent flow rate control transmitter and an automatic anti-purging control device system. A boiler combustion air flow measurement system device with accuracy and stability, energy-saving and environment-friendly properties, safety and reliability and long-term maintenance-free property is mainly provided for a thermal power plant. Problems of non-enough air flow measurement straight pipe section, incorrect measurement and severe dust blockage existing in the running process of a power plant boiler are solved fundamentally. Measuring system

• High measuring accuracy, excellent linearity and repeatability, and high performance price ratio are achieved; Bullet-head sensor made by advanced design concept is capable of generating accurate and stable pressure difference signal;

• The probe structure has high intensity, wearing resistance, no leakage and anti-blocking property;

• The multi-point cross section measuring mode is used to solve the problem of inaccurate measurement caused by large pipe diameter and non-enough straight pipe section;

• An automatic zeroing differential pressure transmitter with high accuracy and ultralow measuring range is used to obtain stable value during low flow rate measurement;

• Unique anti-purging technology is applicable for normal work under various air stream environments with high dust contents;

• Individual design scheme is provided for user, and the position and number of measuring point are adjusted to realize multi-point cross section measurement. Optimized combustion

• Accurate air flow measuring data is supplied to improve the combustion efficiency of the boiler;

• Leveling of coal dust distribution between burners is solved to ensure that the wind-coal ratio of each burner reaches an appropriate level;

• It is ensured that each burner supplies coal dust and air into the furnace according to a certain wind-powder ratio so as to achieve better combustion effect in the furnace;

• The primary and secondary air flows are adjusted to control the centre of boiler combustion flame and to prevent boiler coking and pipe explosion;

• Low-nitrogen combustion is realized to remarkably reduce the coal consumption of the machine set and to reduce the emission of nitrogen oxide;

• Air supplying quantity and air inducing quantity are adjusted reasonably so as to maintain negative pressure in the hearth and ensure safe running of the boiler. Energy-saving and emission-reduction

• The air stream pressure loss of the sensor probe is low, so that the electricity consumption of the fan is reduced; The quantities of cold and hot air at the inlet of a coal grinding machine are adjusted reasonably to ensure appropriate granularity of the coal dust and to reduce the electricity consumption of the coal grinding machine;