How to deal with the vibration of rotary kiln body caused by technological reasons?Date: 2019-07-24 Views:
Due to the characteristics of rotary kiln equipment, such as high temperature, large load, fast speed, long length, etc., the probability of vibration of rotary kiln during operation is greatly increased, and the vibration degree and performance condition of rotary kiln are various.The causes of vibration can be classified into two categories: process and equipment.Today we will talk about the kiln vibration caused by process reasons and the treatment methods.
Rotary kiln cylinder not straight or deformation will cause periodic vibration of rotary kiln.The following is a brief introduction of 3 kinds of technological reasons and treatment methods that cause rotary kiln vibration.
1. Stop the kiln normally before starting
Rotary kiln by kiln or temporary urgent pause for a long time, just after the ignition or restore the kiln, rotary kiln appear less than the periodic vibration of semicircle, serious when individual wheel (sometimes more than one wheel) and belting leather in a certain interval does not contact, trade, transfer and vibration synchronous motor current with volatility, serious when rotary kiln with the big gear drive pinion and synchronous vibration.After the rotary kiln runs for a period of time (generally within 3d), the vibration of the rotary kiln gradually reduces until it returns to normal.
(1) main reasons
The main reasons for this kind of qiao situation are three: rotary kiln stop after the auxiliary transmission time is too short, hot kiln turn kiln interval time is too long, each turn kiln Angle is not correct;Rotary kiln after a long time stop kiln, during the stop kiln did not according to the requirements of the kiln or kiln turning Angle is not correct;Rotary kiln emergency stop did not play auxiliary transmission in time.
(2) processing methods
If the rotary kiln ignition or resume feeding operation within 3d, vibration gradually reduce until return to normal can not do any processing, when the rotary kiln vibration does not fully return to normal, in the process operation should control the rotary kiln speed, can not accelerate blindly.
Special attention should be paid to each rotary kiln stop feeding or stop kiln for a long time, must be in accordance with the provisions of the rotary kiln operating instructions, correctly play auxiliary transfer and over kiln, otherwise it may cause rotary kiln cylinder fatigue fracture.
2. Stop the kiln before starting
Stop kiln rotary kiln by accident, just after the ignition or restore the kiln, rotary kiln in less than half the cyclical vibration, serious when individual wheel (sometimes more than one wheel) and belting leather in a certain interval does not contact, trade, transfer and vibration synchronous motor current with volatility, serious when rotary kiln big ring gear and drive pinion and synchronous vibration.When the rotary kiln runs for a certain period of time (above 3d), although the vibration of the rotary kiln is reduced, the vibration value is still beyond the allowable range, and the vibration cannot be completely eliminated after many adjustment methods.
(1) main reasons
There are three main reasons for this situation: the rotary kiln large area of brick or large area of red kiln stop coal fire is not timely, stop fire is not strictly in accordance with the provisions of the rotary kiln operation manual correctly transfer and over the kiln, resulting in rotary kiln cylinder uneven expansion and contraction and serious bending deformation;In the bad weather of strong wind and heavy rain, the kiln stopped accidently. After stopping the kiln, it failed to play auxiliary transmission and turn over the kiln in time.The rotary kiln stopped its kiln at the first stage and never turned over after it stopped.
If it is a large area of rotary kiln brick or large area of red kiln, should be timely stop the coal fire stop play auxiliary transfer and turn over kiln, try to extend the cold kiln time;During the severe weather of strong wind and heavy rain, the standby power supply must be enabled at any time. At ordinary times, the standby power supply should also be maintained in good condition.If the kiln tube is distorted and curved, it should be adjusted first, especially if it contains a non-straight center line of one, two and three gears simultaneously.When laying refractory bricks, the minimum point of lead pressure should be transferred to the top of the rotary kiln (i.e. the arch is on the top). In particular, when laying refractory bricks in the rotary kiln, the kiln should not be turned over for several days. The bending deformation of the rotary kiln can be slightly reduced by relying on the dead weight of the rotary kiln.At the initial ignition of the rotary kiln, the maximum point of the lead pressure data is transferred to the top of the rotary kiln (that is, the arch is at the bottom).Under the high temperature condition of rotary kiln, the maximum point of lead pressure data is transferred to the top of rotary kiln for 10-15min, and then it is run by auxiliary transmission for 3-5min. After repeated several times with this method, the vibration of rotary kiln will gradually reduce.If a large area of brick is removed or a large area of red kiln results in serious deformation of the kiln cylinder, the severely deformed kiln cylinder should be replaced after the above method is ineffective.
3. Thermal expansion of cylinder and belt
During the operation of the rotary kiln, the vibration value of the third gear wheel increases gradually from small, and sometimes after a period of time, the vibration value decreases gradually from large until it returns to normal.Periodic vibration is not obvious or not regularly, cylinder scanner (or) were examined with a handheld thermometer temperature measurement data showed that the second leg temperature increased obviously, the belting leather with handheld thermometer to check belting leather plate, the temperature significantly higher than that of the adjacent barrel temperature, at the same time with the second leg of the roller temperature increased, and check the belting leather with plate significant slippage found reduced, serious when there is no slippage may even belting leather pad lock.
(1) main reasons
The main reasons for this situation are as follows: the second gear belt refractory brick is thin, the process operation is improper, the flame moves back, forming a high temperature area in the second gear belt, resulting in the expansion of the kiln cylinder and the belt after the temperature increases;The refractory bricks in the second gear belt are extremely thin, which causes the expansion of the kiln cylinder and the belt after the temperature increases.
If the vibration value gradually increases from small, after a period of time, the vibration value gradually decreases from large until it returns to normal, which is generally caused by improper process operation, resulting in the formation of high temperature zone at the wheel belt, resulting in thermal expansion of the cylinder and the wheel belt.In the process operation, the flame length and intensity should be controlled, and the external cooling of the cylinder should be strengthened in the high temperature area to avoid local high temperature in the second gear belt.If the kiln vibration gradually reduces until it returns to normal, no treatment can be done.If the kiln vibration gradually reduces until it returns to normal, no treatment can be done.If the vibration value increases gradually, from small to run after a certain period of time can not return to normal, usually caused by serious ultra-thin belting leather place firebrick cylinder and belting leather, caused by thermal expansion technique in operation should be controlled on the flame length and strength, reduce the second leg belting leather at the local high temperature, strictly control the barrel temperature (should guarantee under 400 ℃), such as temperature control should consider to stop fire brick kiln replaced.
The reasons for the vibration of rotary kiln body are relatively complex, and it is better to analyze the problems according to the actual situation of the site. However, the above three technological reasons and solutions can basically solve the vibration problems of rotary kiln.