How To Find Headbox Malfunction Reasons
As the heart of paper machine, Headbox is the source of many paper diseases. Some abnormal situations in its operation also need to be dealt with in time. The automatic control system and the display of change trend are very helpful for tracing the cause of the fault. Because of all kinds of situations, finding and solving faults must follow a systematic approach.
The impact of a defective measuring device can often be detected by the control loop set in the manual. The faults of the actuator can be found from the slight change of control parameters and whether there are corresponding changes in the process. Separate control circuit is quite easy to detect faults, but influenced by many factors, so-called “super-level control”, such as slurry net speed ratio, slurry longitudinal and transverse distribution.
If the Headbox pressure and liquid level are not reliable, the following can be checked:
Does the short cycle interfere?
Is the setting of pressure, liquid level and flow rate most suitable for the requirements of product grade?
Are the actuators all within their scope of operation?
Is liquid level setting appropriate?
Does the setting of air compressor affect liquid level? Correspondingly, are the pressures consistent?
Is all the control parameters set properly?
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