1, the diluted slurry from the White Water Tower passes through a section of desanding pump and enters into a number of desanders, and the treated slurry enters the stable slurry tank, while the slurry enters the secondary desander and the third stage of sand removal. The slurry from the apparatus and the white water are mixed and sent to the second-stage sand remover through the second stage. The light slag from the exhaust port enters the degasification tank and overflows into the riser of the white water tower. After the two-stage treatment, the slurry is mixed with the white water tower riser and white water. The second-stage slurry slurry enters the three-stage de-sanding device through a three-stage de-sanding pump, and the slurry enters the secondary pump inlet. The slurry is discharged through the slag discharge valve at regular intervals. Each sand remover slurry tube has a white water connection that can be flushed.
2 Abnormal process flow at fault When the fault occurs, the actual detection of paper quantitatively fluctuates greatly. The current of the second-stage sand removal pump is reduced by about 30%. The liquid level of a slurry tank fluctuates continuously, and the liquid level of the white water tower riser fluctuates greatly.
3 Analysis and processing process The system detected large current fluctuations in the secondary desanding pump, focusing on troubleshooting the slurry pump because of its inability to produce stable production. In order to ensure supply, after research and analysis, it has boldly attempted to eliminate the secondary and tertiary sand removal systems. After 2 days of use, it was followed for 2 days. The quantitative stability was observed and no fluctuations were found. In the course of careful investigation, it was found on site that air bubbles were generated at the lower section of the three-stage sand remover (two in total). At the time of parking, the de-sanding device for air leakage was dismantled, and compressed air was discharged at the air bubble flange. It was finally determined that the compressed air of the slag discharge valve was passed from the power room through the connecting channel with the valve core into the valve core, and the valve core was closed. When the compressed air is pushed into the third stage, it eventually causes cavitation in the second stage desanding pump, which causes the slurry entering the white water tower to fluctuate, eventually causing quantitative fluctuations.
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