A Measuring Method of Inlet Ventilation of Coal Mill

A measurement method, coal mill technology, applied in the direction of grain processing, etc., can solve the problems of low precision and large deviation of the measurement results of the ventilation volume at the entrance of the coal mill, and achieve the effects of improving efficiency, small deviation, and convenient implementation

Inactive Publication Date: 2017-11-17
ANHUI HUADIAN SUZHOU POWER GENERATION +1
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AI Technical Summary

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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  • A Measuring Method of Inlet Ventilation of Coal Mill

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Embodiment Construction

[0039] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific illustrations.

[0040] Aiming at the structural characteristics of the existing coal mill, the present invention proposes a method for indirectly measuring the air volume at the inlet of the coal mill according to the industrial analysis data and actual operating parameters of the coal mill for grinding coal, and adopting a heat balance method.

[0041] The method is implemented based on a corresponding intelligent measuring device, and the intelligent measuring device mainly includes a corresponding sensing and measuring device, a computing center (or computing unit) and a data storage unit.

[0042] Among them, the sensing and measuring device has several sensors, which are used to obtain various raw data required for measuring the air volume at the inlet of t...

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Abstract

The invention discloses a soft measurement method for the air flow at the entrance of the coal mill. The measurement steps of the soft measurement method are: first preset the air flow G (t / h) at the entrance of the coal mill, and then complete the air temperature Ti1 at the entrance of the coal mill ( °C) calculation, the calculation unit triggers to extract the stored coal mill inlet temperature Ti (°C), compares it with the calculated coal mill inlet air temperature Ti1, calculates the coal mill inlet air temperature difference dTi, and stores it; After completing the calculation of the air temperature difference dTi at the coal mill inlet, the calculation unit will trigger the extraction of the stored air temperature difference dTi at the coal mill inlet, and compare it with 1 for judgment: if dTi<1, the preset coal mill The inlet ventilation rate G (t / h) is the actual ventilation rate at the coal mill inlet at this time; if dTi≥1, the preset coal mill inlet ventilation rate G (t / h) is wrong, and the coal mill needs to be reset The ventilation volume value G (t / h) at the inlet of the machine is measured again until dTi<1 is obtained. The measurement result of the invention has high precision and is convenient for optimizing and adjusting the operation of the 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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B02C23/00B02C25/00
Inventor 张代新郭西清张宁全文涛吕晓东王健
Owner ANHUI HUADIAN SUZHOU POWER GENERATION
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