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coal raymond mill seal transmission fault reasons and solving measures

21 April, 2015 at 3:48 am in Business

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At present, with the rapid development of the domestic power industry, for the application of air swept coal mill is also more widely, various problems in the application of this equipment is gradually exposed. The wind swept coal raymond mill process of common drive disc seal system fault analysis, put forward some effective measures.
Analysis of the causes
Bituminous coal raymond mill driving disc seal ring leakage at the early stage, only a slight leakage, leakage, and then to the rapid development of a large number of small particles of stone coal and Mars is ejected from the drive plate. According to the drive plate structure and operation situation analysis, determine the coal raymond mill gear disc sealing ring has the following main reasons of frequent leakage.
1, coal raymond mill machine and the driving disc sealing ring gap is too large
Bituminous coal raymond mill machine sealing design of ring and drive plate installation clearance for the 2.5mm, the error of installation and operation for a long time, the gap can be increased to 5 ~ 8mm. The gap is too large, reducing the seal internal and external air chamber of a wind chamber pressure, weaken the seal air sealing effect, caused by coal gangue particles larger into the sealed air chamber, and then falling between the drive plate and carbon seal ring labyrinth seal chamber, resulting in seal failure.
2, the driving disc carbon sealing type design flaw
A gap between the sealing ring and the gear disk with the increase of operation time and is more and more big, can not effectively prevent the stone coal. Carbon seal structure of a single, poor safety performance, stone coal particles was destroyed easily damaged.
3, the large amount of coal gangue
Due to changes in the coal market, coal boiler is deteriorating in recent years, mixed burning inferior coal has become inevitable, bituminous coal raymond mill in the process of operation, a significant increase in the amount of coal gangue. As a result of a wind chamber space is limited, if not timely discharge, Shi Zimei can not be timely discharge, will inevitably enter the base gap between the sealing ring and drive plate, resulting in destruction of the sealed, leak.
4, running off the scraper
Scraper shedding, large stone coal accumulation in a wind chamber, a sealing ring and the gap between the drive plate into the sealed air chamber; small coal particles piled up, will be sealed air chamber filled with small, into the gap between the carbon seal ring and the driving disc in the drive, circling to the carbon seal ring the damage caused by the leakage.
The measures to solve the
Through the above analysis, the main reason of bituminous coal raymond mill leak sealing ring is a sealing ring and a transmission wheel drive plate gap is too large and the carbon seal ring material brittleness, so the transformation of the main objective is to reduce the base seal ring and drive plate gap and improve the service life of carbon seal ring. Through the analysis of the driving plate seal structure, put forward the following scheme.
1, carbon graphite seal ring instead of rubber seal ring
The Shi Motan seal ring instead of rubber seal ring, can improve the service life of carbon seal ring. According to the coal raymond mill gear wheel and carbon seal ring installation groove size re processing of LAN, custom rubber sealing ring. The coal raymond mill during the repair, remove the original carbon seal ring, the rubber sealing ring is arranged in the original carbon seal ring position, joint viscose with clamps, the processing pressure flange with the original carbon seal ring and fixed ring are connected together by bolts to form a sealing pair.
2, increase the metal sealing scraper interior jacket
Scraper room (sealed air chamber outer) increase in the metal sealing sheath, a sealing ring can be prevented and the transmission plate gap is too large. According to the size and the actual mapping drawings, to determine the dimension of jacket, along the circumference of the clip made of material with 0Cr13, &le, ellipticity error concentricity deviation; 1mm, ≤ 0.5mm. The opportunity to overhaul the coal raymond mill, a wind chamber open manhole, the metal sealing sheath is installed on the driving wheel carbon seal ring, adjustment and the drive disc radial clearance in 1 ~ 1.5mm, welding and fixing.
Ultra fine grinding of coal transmission disc carbon seal ring for the transformation, the transmission plate almost no air leakage, leakage phenomenon, the wind swept coal mill drive plate area of the oil station, reducer bearing temperature and thermal instrumentation to further reduce the operation risk and maintenance of equipment, maintenance workload is greatly reduced, in addition, the operating personnel to avoid the coal raymond mill incorrect operation, to ensure that the coal raymond mill operation more safe, reliable.

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