Measurement method of coal mill entrance ventilation quantity

Abstract

The invention discloses a soft measurement method of the coal mill entrance ventilation quantity. The soft measurement method comprises the measuring steps: firstly, presetting the coal mill entrance ventilation quantity G (t / h), after completing calculation of a coal mill entrance air temperature Ti1 (DEG C), triggering a calculating unit to extract a stored coal mill entrance temperature Ti (DEG C), comparing with the coal mill entrance air temperature Ti1 obtained by calculation, calculating out a coal mill entrance air temperature difference value dTi, and storing; after completing calculation of the coal mill entrance air temperature difference value dTi, triggering the calculating unit to extract the stored coal mill entrance air temperature difference value dTi, and comparing and judging with 1: if the dTi is less than 1, the preset coal mill entrance ventilation quantity G (t / h) is the current coal mill entrance actual ventilation quantity; and if the dTi is greater than or equal to 1, the preset coal mill entrance ventilation quantity G (t / h) is wrong, the coal mill entrance ventilation quantity G (t / h) is required to be anew preset, measurement is carried out again until the dTi is less than 1. The measurement result has high precision, and is convenient for optimization and adjustment of operation of a pulverizing system.

Description

technical field [0001] The invention relates to a soft measurement method of ventilation volume, in particular to a measurement method of coal mill inlet ventilation volume. Background technique [0002] With the increase of the unit capacity of the thermal power plant and the improvement of the coordination control level, the accurate measurement and control of the air volume of the boiler unit is more important; especially the inaccurate measurement of the air volume at the entrance of the coal mill often leads to the control of air volume and fuel volume, Boiler load coordination cannot be put into automatic operation, which also causes poor combustion conditions, lower boiler operating efficiency, and coal mill blockage and tripping due to insufficient ventilation of the coal mill, which brings hidden dangers to the safe and economical operation of the boiler. [0003] The pulverized coal burner of the power plant boiler needs to maintain an appropriate air-to-coal ratio...

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Problems solved by technology

[0004] The present invention provides an optimized method for measuring the ventilation volume at the coal pulverizer inlet, aiming at the problems of large deviation and very low precision in the measurement results of the ventilation volume at the entrance of the coal pulverizer

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