Early warning device and method for overhaul of medium-speed roller coal mill

Abstract

A medium-speed roller coal mill overhaul early warning device and method, which includes a wind pressure early warning device, a grinding roller early warning device and a nozzle early warning device, and the air duct of the wind pressure early warning device is connected to the primary air duct air inlet of the coal mill , the air pressure sensor is installed in the air duct, connected with the grinding disc of the coal mill through the grinding roller warning device, the sensing head of the distance sensor faces the grinding sleeve in the grinding disc, and connected with the static ring of the coal mill through the weight sensor of the nozzle warning device, The filter disc is connected to the weight sensor and is located on the side of the moving ring of the coal mill. The wind pressure sensor and the weight sensor give an early warning and then start the distance sensor. When the PLC control system sends out an overhaul alarm, it will automatically stop and then carry out overhaul. The invention overcomes the problem that the wear and tear of vulnerable parts of the original coal mill is not synchronous, and the overhaul time of the coal mill cannot be accurately and reasonably determined. Time, simple and convenient operation.

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

Images