Failure of Coal Mill
Mill Machine:
The mill is widely used in metallurgy, building materials, chemicals, mining minerals in areas such as grinding materials processing. According to the fineness of the grinding of materials and discharging materials fineness, milling machines can be divided into Raymond Mill, vertical pendulum mill, high pressure hanging roller mill, high pressure micro powder mill, Straight Centrifugal Grinder machine, super pressure trapezium mill, three-ring medium speed mill six mill type.
failure of coal mill
Coal Mill:
Blast furnace pulverized coal injection technology began in the 1950s and 1960s, the blast furnace coal products in the industrial, large-scale popularization of half a century, along with increasing domestic steel production capacity and blast furnace pulverized coal injection key technologies continue to progress and improve, the gradual expansion of market demand, especially in recent years with the growing scarcity of high-quality coking coal resources in China, the blast furnace injection of coal in the steel smelting process links the increasing savings in the steel industry smelting costs, is playing an increasingly important role. Pulverized coal injection process should include the raw coal storage and transportation systems, pulverizing system, coal conveyor systems, injection systems, gas systems and coal metering system, the latest design of pulverized coal injection system also includes the entire coal injection system computer control center.
The milling is an important process for blast furnace pulverized coal injection technology. Which you want to use the coal mill, advanced coal mill to grind the raw coal to the fineness of pulverized coal, can effectively avoid impurities or caking as a result of incomplete combustion, combustion pollution. Can be used to do the coal mill mill: Raymond mill, three-ring medium speed mill, CLM Vertical mill, Super pressure trapezium mill, high pressure hanging roller mill, high pressure differential mill production TGM series coal mill with its small footprint, low power consumption, maintenance advantages of the latest energy efficient, full support for the blast furnace pulverized coal injection technology, often with jaw crusher and other equipment with the use of pulverizing system of drying and grinding, the powder and dust are received to fill the blank of domestic market of very large mill, creating efficient international industrial mill and a new era of low energy consumption.
Coal Mill Working Principle:
Host reducer drive to the central axis of rotation, the upper end of the shaft connecting Plum racks, shelves equipped with a roller device and the formation of the swing fulcrum. The roller device is not only around the central axis of rotation around the grinding ring revolution, roll grinding friction and rotation. Plum aircraft equipped with a blade system, its location in the bottom of the grinding roller blade and roller coal toss feed mill roll grinding ring with the transfer process between the formation of the litter layer, the coal layer by the rotating grinding roller The coal mill to produce the outward centrifugal force (ie, extrusion force), which reached milling purposes.
How to Maintenance:
1, A control cabinet of the operation and maintenance should be the person responsible.
2, Regular inspection cabinets cabinet, instrument display is clear and bright, flexible movement of the operating handle, contactors, main electrical electric shock without dust.
3, frequently check components and the connection is loose, damaged.
4, Every six months telemetry insulation resistance, identify problems in time.
Failure of Coal Mill:
Coal mill, crusher, coal-fired boiler operation key. Mill, as the name implies, crushed into fine powder coal, so it can blow the boiler furnace to generate steam. No coal, no fire. No fire, no steam. No steam, no power supply. Six mill, on the utility of two units each employ a continuous basis for each. Each grinder mill is responsible for about 130 megawatts of electricity. When the coal is of good quality, the unit can run operating at full capacity in five shredders. Therefore, in the event of a failure, the impact on production is minimal assumptions grinder will not fail. This double failure, as a backup because of plant maintenance in the past two gearbox.
Grinder on the transmission reliability has always been poor. 12 boxes scene, with an average 10 people every year to rebuild, resulting in the average time between failure is about 1.2 years. About 35 percent of the reconstruction of the need to replace the gear, and expensive work, and spent 4,680 megawatt hours. In the other 65% of the failure of the rotating gears and bearings replaced. Major rehabilitation costs about $ 20,000 repair, and minor reconstruction cost $ 2,500 (Figure 1). The average reconstruction costs $ 8,625 without any downtime figures. The actual records show that units 1 and 2 repair expenditures were $ 137,000 and $ 81,000.
Hot temperature - due to overwork, the running of the gear box. Continuous duty lubricants average temperature of about 200 degrees Fahrenheit, it quickly reduced. In the gearbox, the surface of the mating components produced by hot spots, which increase the degradation rate.
Installation with the primary circuit loop air cooling system to reduce fluid temperature.
Oil drilling Road, force feed lubricant bearing.
Installation of high-quality respite to limit the intake of pollution.
On the circulation system, install a filter to remove the intake and pollutants generated.
All wetted parts provide adequate quantities of clean, cool oil, will eliminate their problems and avoid costly re-design of the ball mill grinder.
This utility is a bad actor pulverizer gearbox despite the fact that business units in more than 13% of its rated load, reliable assets. Combining with other condition monitoring technologies, oil analysis, find the root causes of failure is critical. It helps with mild to design changes, offset by overloading conditions, modify the path of return exclusive of any shutdown costs less than a year. Oil analysis, and maintain a healthy lubrication conditions, and detection and fault handling, production is threatened before.
