Deflagration detection method and detection system in pulverized coal pipeline at coal mill outlet

Abstract

The invention relates to a method for detecting deflagration in a coal mill outlet coal dust pipeline, and a detection system thereof. The detection method comprises the following steps: analyzing and screening all deflagration accident records to obtain parameter records having related characteristics and determine the deflagration instance of a milling system and characteristic parameters most related with the deflagration; sensing related pressure parameter signals by online arranged pressure sensors; recording a pressure parameter signal curve through a record analyzer; picking pressure signals through a detection device, determining and comparing abruptly changed pressure signal parameters, and instantly emitting an alarm signal through an alarm device if deflagration generation determination conditions are met; and instantly emitting a milling system running stopping command through a linkage module, and carrying out closed milling or steam fire extinguishing treatment in order to rapidly inhibit the deflagration of the milling system in an initial stage. The method and the system can realize efficient, stable and reliable detection and alarming, and can timely emit the signal after the deflagration and instantly stop the running of the milling system.

Description

technical field [0001] The present invention relates to the detection of the working state of the coal mill, and specifically relates to the detection method of the working state of the pulverized coal pipeline at the outlet of the coal mill. Background technique [0002] Coal-fired power plant boiler pulverization system consists of coal storage bunker, coal feeder, coal mill, primary fan, sealing fan and coal powder export pipeline. figure 1 A part of the pulverizing system is shown: a coal mill 1 and a pulverized coal outlet conveying pipeline 3 . The coal mill 1 includes a body 4, a separator 2 arranged in the body 4, a grinding roller 5, a grinding bowl 6, a primary air inlet 7 on the bottom side of the body 4 and an outlet valve (not shown) on the upper part; the separator 2 is provided with a falling coal inlet pipe 8; the pulverized coal outlet conveying pipe 3 is connected to the upper part of the body 4, and is connected to the furnace (not shown). The raw coal f...

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Problems solved by technology

[0005] However, the detection methods disclosed in the above-mentioned documents and the systems adopted all have deficiencies: they cannot fully effectively, reliably, and timely detect the spontaneous combustion in the pulverized coal delivery pipeline to avoid the resulting deflagration and avoid the occurrence of major accidents

Compared with the temperature fire early warning system, the early warning signal can be issued in advance, but the system relies on the accuracy of the data obtained by the carbon monoxide sensor, and the device configuration has many and complicated units, which is expensive and requires a lot of operation and maintenance

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