Method for controlling overcurrent jump stop of high-temperature fan in cement rotary kiln production line pipeline

Abstract

Disclosed is a method for controlling overcurrent jump stop of a high-temperature fan in a cement rotary kiln production line pipeline. The method includes detecting two-phase current of a high-temperature motor through a current sensor, and decomposing detected current through coordinate conversion to acquire momentary active and momentary reactive current; utilizing a PI adjuster to control the momentary reactive current to prevent a frequency changer from overcurrent protection due to load changing; when amplitude of output current of the high-temperature motor is higher than a set value, controlling the frequency changer to quickly lower frequency, and when current returns to normal, increasing the frequency to given frequency. The method has the advantages of simple principle, convenience in control, good reliability, high controlling accuracy and the like.

Description

technical field [0001] The invention mainly relates to the field of motor control in a cement rotary kiln, in particular to a control method used to solve the problem of a high-voltage frequency converter when a high-temperature fan pipeline in the cement industry collapses. Background technique [0002] At present, the competition in the cement industry is very fierce, but the key is the competition of manufacturing costs, and the power consumption of motors accounts for nearly 30% of the cost, and the high-voltage motors used to drive fans account for a large proportion of the motors. Therefore, it is extremely important to do a good job in the work of reducing consumption and increasing efficiency of electric motors. [0003] At present, the phenomenon of "big horses and small carts" of fans in many cement plants is serious. Using frequency conversion speed regulation technology to change the operating speed of the equipment to adjust the size of the air volume can not on...

AI Technical Summary

Problems solved by technology

[0004] Among them, in the application process of the high-temperature fan frequency conversion transformation at the kiln tail, due to the frequent occurrence of "slump" phenomenon, the high-voltage frequency converter often occurs over-current tripping, which directly affects the normal operation of the production line

If this phenomenon occurs frequently, it will cause damage to the motor of the high temperature fan

[0005] The reason for the overload of the high-temperature fan due to "slump" is that when the dust on the pipe wall of the preheater adheres to a certain thickness, it will collapse and fall off, resulting in an increase in the dust concentration in the pipe, an increase in resistance, and an increase in negative pressure. Increase the load of the exhaust fan; if the vertical flue or the preheater is crusted or there is material collapse, it will also cause airflow fluctuations, making the airflow in the exhaust pipe turbulent, resulting in a sudden increase in the load of the high-voltage inverter, resulting in overheating. flow protection

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