Method and apparatus for distinguishing coal-burning boiler coal fines timely degree property

Abstract

The invention relates to a method and a device for judging a coal burning boiler on fire and time performance characteristics. The device comprises a temperature measuring instrument, a cloud deck, an alarm, an A / D converter and a data processor. The temperature measuring instrument collects temperature signals at a certain rotation angle Theta range for a coal dust jet flow, a characteristic length l and a characteristic temperature t can be calculated through the collected temperature signals, a critical characteristic distance l' and a characteristic temperature t' for reflecting ignition characteristics of the coal dust air flow are measured on a design cost burning test under typical load, the characteristic length l and the characteristic temperature t are compared with the critical distance l' and the characteristic temperature t' to figure out the margin Alfa of the coal dust ignition and time performance temperature, and the ignition and time performance index Beta based on the characteristic length of the frontal area of the flame, and the coal dust ignition and the time performance are judged according to the two parameters. The device is remarkably characterized in that how the operational parameters change need not to be detected, such as fuel characteristics, wind speed at one time, wind density at one time, etc; the coal dust area temperature field can be directly detected to quantitatively and conveniently judge current ignition state of the fuel, thereby placing a high value for boiler safety, economy, and stable operation.

Description

technical field [0001] The invention relates to the field of boiler combustion diagnosis, which is used for judging the timeliness of ignition of pulverized coal airflow of a coal-fired boiler, and in particular to a method and device for judging the timeliness of pulverized coal ignition of a coal-fired boiler. Background technique [0002] The timely ignition of the pulverized coal flow directly affects the stable operation of the pulverized coal boiler, and is related to the burnout of the fuel in the furnace. At present, boiler operators mainly adjust the combustion of boilers based on experience. For example, for most domestic power plants, the instability of coal type is a prominent problem. Changes in coal quality will affect the ignition of pulverized coal, boiler output, and pulverized coal. However, there is no good way to judge the fire timeliness of pulverized coal at present. The timeliness of fire is completely judged by the operator’s eyes, or the carbon conte...

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Problems solved by technology

[0004] There is also a combustion diagnosis system based on computer image processing technology in China. The main diagnosis functions are: 1) Flame temperature field distribution; 2) Combustion economy diagnosis; 3) NO X 4) Estimation of carbon content in fly ash; although such a combustion diagnosis system can provide a certain scientific basis for operators to adjust combustion to a certain extent, the system is complex and expensive, and it is difficult to obtain such a calculation model, method, and The adaptability of coal types needs to be improved and explored. More importantly, the above image processing technology does not directly provide real-time detection criteria and quantitative calculation methods for the timely ignition of pulverized coal.

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