A method and system for measuring primary air volume at the inlet of a medium-speed coal pulverizer

Abstract

The invention discloses a method and system for measuring the amount of inlet primary air of a medium speed coal mill. The method comprises the steps of S1, collecting the temperature th and the amount Bh of the inlet hot primary air at the position of an inlet hot primary air pipeline, collecting the temperature tc of the inlet cold primary air at the position of an inlet cold primary air pipeline, and collecting the temperature te of an inlet hybrid primary air at the position of an inlet hybrid primary air pipeline; S2, according to the heat balance principle, calculating the amount Be of the inlet hybrid primary air at the position of the inlet hybrid primary air pipeline. By means of the method, direct measurement of the amount of the primary air at the position where the distributinguniformity of a flow field is poor can be avoided, the amount of the primary air is calculated through measurement results, which are relatively good, at other positions, the measurement accuracy ofthe amount of the inlet primary air of the coal mill can be obviously improved, and operation adjustment of operators is facilitated.

Description

technical field [0001] The invention relates to the technical field of air volume measurement of medium-speed coal mills, in particular to a method and system for measuring primary air volume at the inlet of medium-speed coal mills. Background technique [0002] At present, large coal-fired generating units are often equipped with positive pressure direct blowing pulverization system. The primary air volume at the inlet of the coal mill has a great influence on the operation of the pulverizing system and the boiler, and is an important parameter for the control and adjustment of the positive pressure direct blowing pulverizing system. When the coal supply is constant, keep other operating conditions unchanged. If the primary air volume increases, the fineness of coal powder will also increase, which will affect the burnout effect of fly ash. The machine output increases, but the ventilation power consumption and exhaust gas temperature will increase. If the primary air vol...

AI Technical Summary

Problems solved by technology

Due to the short measuring straight pipe section at this measuring position, the uniformity of the flow field distribution is poor, which has a relatively adverse effect on the accurate measurement of the primary air volume at the inlet of the coal mill.

For this reason, the accuracy of the primary air volume at the inlet of coal mills in many power plants is not satisfactory, which brings more inconvenience to operating personnel

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