Rotary kiln shutdown kiln is divided into planned kiln shutdown and emergency kiln shutdown. Regardless of which type of kiln shutdown, there are many aspects that require operator attention to avoid damage to the rotary kiln.
Rotary kiln shutdown kiln is divided into planned kiln shutdown and emergency kiln shutdown. Regardless of which type of kiln shutdown, there are many aspects that require operator attention to avoid damage to the rotary kiln. In this article, the ZK CORP is talking about the relevant precautions for the planned shutdown of the kiln.
The shutdown of the rotary kiln firing system shall be planned to stop the kiln in the event of no accidents. The kiln scheduling shall fully consider all details, and shall be arranged according to the time of kiln shutdown without affecting the system maintenance work.
First, 2 hours before the scheduled flameout, reduce the supply of raw materials, the decomposition furnace gradually reduce coal, and then gradually reduce the amount of raw materials in order to prevent the preheater system temperature is high.
Second, cold air valve slowly open, so that the high temperature fan inlet temperature does not exceed 400 °C.
Third, when the temperature of the outlet of the decomposition furnace is reduced to 600-650°C, the material is completely stopped, and the speed of the kiln is reduced to 0.5r/min to control the coal consumption of the kiln head.
Fourth, reduce the high temperature fan pull wind, with the reduction of wind at the same time, reduce the kiln feed coal, do not make the raw material out of the kiln.
Fifth, stop the humidifier tower spraying water, and then continue to reduce the wind.
Sixth, when the tail temperature drops below 800°C, stop the kiln head to feed coal, then stop the high-temperature blower, the cold air valve is fully opened, and use the kiln-tailed bag discharge fan to control the amount of air used for the valve. Note that after the kiln stops coal, it is necessary to maintain the necessary primary air volume to prevent deformation of the coal injection pipe.
Seventh, depending on the situation, the cylinder cooling fan unit and the kiln mouth sealing ring cooling fan shall be used.
Eighth, stop the kiln tail large bag, back to the ash delivery system, raw material feeding system.
Ninth, when the temperature of the rotary kiln shell reaches below 250°C, it is transferred to the auxiliary kiln.
Tenth, after the kiln is turned off, pay attention to the negative pressure control of the kiln hood, that is, reduce the helium of the chiller and the exhaust of the kiln exhaust fan.
Eleventh, the kiln discharge is very small, stop the cold, after a period of time, from the six rooms to one room each fan stop one by one.
Twelfth, stop the kiln head electric dust collector, clinker transportation, a fan, kiln head electric dust collector exhaust fan, use the kiln dust collection exhaust fan to control the kiln negative pressure.
Thirteenth, depending on the situation, stop feeding coal fans and gradually pull the coal injection pipe out.
Stopping the kiln is simple and simple, and complex and complicated. As long as you follow the instructions one by one, you will find that it is not trouble. The most important thing is that you need multiple departments to cooperate with each other, so that each department can burn according to an orderly operation is required, especially if the pulverized coal bunker is empty, and how much pulverized coal is left for kiln cooling operation should be coordinated.
The ZK CORP believes that as long as you treat the equipment with care, the rotary kiln will certainly give you more returns.