Medium-speed roller type coal mill overhaul early warning device and method

Abstract

The invention discloses a medium-speed roller type coal mill overhaul early warning device and a method. The early warning device comprises an air pressure early warning device body, a grinding roller early warning device body and a nozzle early warning device body, an air pipe of the air pressure early warning device body is connected with a primary air duct air inlet of a coal mill, an air pressure sensor is arranged in the air pipe, the grinding roller early warning device body is connected with a grinding disc of the coal mill, a sensing head of a distance sensor faces a grinding sleeve in the grinding disc, a weight sensor of the nozzle early warning device body is connected with a static ring of the coal mill, and a filtering disc connected with the weight sensor is located on one side of a movable ring of the coal mill; and the distance sensor is started after early warning is sent out through the air pressure sensor and the weight sensor, and when a PLC control system gives an overhaul alarm, automatic shutdown is conducted and then overhaul is conducted. According to the device and the method, the problems that easy-to-wear parts of an original coal mill are asynchronously worn, and the overhaul time of the coal mill cannot be accurately and reasonably determined are solved; and the advantages that the structure is simple, online early warning is conducted on the easy-to-wear parts of the coal mill, the overhaul time of the coal mill can be accurately and reasonably determined, and the operation is easy and convenient are achieved.

Description

technical field [0001] The invention belongs to the technical field of coal mill maintenance, and relates to a medium-speed roller coal mill overhaul early warning device and method. Background technique [0002] In large-scale coal-fired power stations, it is necessary to use a coal mill to grind coal into powder and then add it to other mixtures, and then transport it to the coal-fired furnace to improve combustion efficiency and reduce fuel costs. Coal mills are divided into high-speed, medium-speed and low-speed according to speed, which involves a medium-speed coal mill, which is mainly composed of three grinding rollers arranged on the grinding disc raceway along the circumferential direction. The grinding force is generated by the hydraulic loading system and controlled by the PLC. Control system control, because there are many vulnerable parts of the coal mill, mainly reflected in the air leakage at the primary air inlet leading to insufficient air pressure, which wi...

AI Technical Summary

Problems solved by technology

Coal mills are divided into high-speed, medium-speed and low-speed according to speed, which involves a medium-speed coal mill, which is mainly composed of three grinding rollers arranged on the grinding disc raceway along the circumferential direction. The grinding force is generated by the hydraulic loading system and controlled by the PLC. Control system control, because there are many vulnerable parts of the coal mill, mainly reflected in the air leakage at the primary air inlet leading to insufficient air pressure, which will carry the fly ash from the air preheater, causing the dust to fly and spread; secondly, the grinding rollers and grinding discs are severely worn Finally, the gap is too large, resulting in changes in the thickness of the coal seam, and the output is abnormal; in addition, after the nozzle between the static ring and the moving ring is worn too much, the coal powder carried by the coal hopper becomes granular and scattered around the static ring

The overhaul time of the pulverizer cannot be accurately and reasonably determined due to the wear and tear of the above wearing parts are not synchronized

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