For example, for you to solve the problem of rotary kiln with thick tail kiln
Because many users do not understand the knowledge of rotary kiln deeply, and they are often lost in the face of rotary kiln. It is suggested that users of the construction machinery can call the consulting equipment manufacturers to understand the professional technology.
In this paper, a cement plant burning bituminous coal production line as an example to explain the kiln burning problem with thick tail kiln.
The use of rotary kiln factory specifications with 3.2 * 50m, high and low pressure loss preheater prototype preheater, precalciner specifications for 4500mm, average annual output is more than 1500t/d. The equipment used in early years, firing zone 12~16m easy long thick kiln, kiln 15~16m thick 800~1000mm, burning kiln skin for inverted horn shape, processing is extremely difficult, serious operation for seven days was forced to stop the kiln kiln skin artificial processing.
Once through the strengthening of raw materials management, process management and other measures to improve the level of operation, is firing with inverted horn shaped kiln skin situation has eased, output has increased to 1150~1250t/d, but further production kiln condition will deteriorate to normal production.
What are the reasons leading to this situation? The Red Star machine experts have carried on the analysis research to this, summarized the following several reasons, and proposed the reasonable solution.
1, the installation process C5 tube and the smoke chamber is not in strict accordance with the construction drawings, tube inclination is small, the junction is connected with the higher position of the cigarette chamber and the smoke chamber, position of slope near 500mm C5 tube, led C5 into the kiln material for the vacant state, a part of the material is in the kiln the wind blew the smoke chamber, the high concentration of dust, resistance, impact of kiln ventilation.
2, the use of limestone, shale, sandstone, iron ore and limestone into the plant ingredients, MgO content and shale composition changed greatly, raw material cannot be stabilized, changes in the chemical composition of the material in the kiln kiln is large, the thermal system is stable, easy to deteriorate kiln condition.
3, the supply of coal is not stable, there is no fixed adequate supply of coal manufacturers, coal quality is miscellaneous, unable to mix, and even affect the flame temperature and head coal combustion.
4, the low pressure fan, can not meet the requirements for air burner.
5, improve the output of the rotary kiln kiln condition changes or not even wind by adjusting the furnace, resulting in the wind is not reasonable.
6, plant when the burner flame is not ideal, thermal strength is not enough, the flame is too short and too concentrated.
In view of the above situation, how should solve? Red kiln experts give advice, and got a good result.
1, the replacement of the smoke chamber slope castable, the C5 tube and the smoke chamber in a slant slope. The lock hole diameter of decomposing furnace is the original diameter of 1150mm to 1180mm, reducing the dust concentration in the smoke chamber, ensure the ventilation of the kiln.
2, strengthen the control of limestone MgO content and shale composition, find the change, timely adjust raw meal index, ensure the realization of batching scheme.
3, the transformation of coal mill, increase the mill ventilation, the mill temperature has increased from 75 to 85 degrees, as much as possible to reduce the moisture of coal powder.
4, transform fan, the original 22KW motor transposition 30KW motor, the belt transmission instead of direct drive, meet the burner ventilation, ensure that the burner net wind pressure is above 35KPa.
5, adjust the burner, increase the height of the flame tail of the burner, prevent the formation of thick kiln skin at the tail of the burning zone, and avoid the agglomeration of the coal ash, resulting in the kiln inner ring. According to the temperature of the cylinder, the burner position is adjusted to about 20~50mm, the left and right position is about 20mm, and the center position can also be placed in parallel.
6, according to the three air negative pressure, smoke chamber negative pressure and decomposition furnace outlet negative pressure change, timely adjust the three air valve, ensure the use of wind in the kiln.
7, transformation of rotary kiln main reducer, a pair of fast change gear, kiln speed by the highest original 3.98r/min, increased to 4.5r/min, reduce the filling rate in kiln, ensure the thin turn.
According to the expert guidance of the improvement measures, the kiln operation has been good, no longer appear inverted horn shaped kiln skin, burning kiln skin smooth, stable thickness, refractory brick, long service life, production has also been further improved, stable in 1600~1650t/d.
To sum up, when you encounter problems, do not panic, find the cause of the fault, in order to remedy the problem.
