Reasons why a vacuum belt dewatering machine cannot achieve complete dryness.
Release time:
2023-01-19
Source:
The dewatering effect of the vacuum belt filter press is poor when the gypsum moisture content is greater than 10%. The reasons and solutions are as follows: the vacuum level is low, which can be compared with the normal vacuum level, generally above 40 kPa. If the vacuum level is low, check the reasons for the low vacuum level.
The reasons why the vacuum belt dewatering machine cannot dry properly may include the following points
The dewatering effect of the vacuum belt dewatering machine is poor when the gypsum moisture content is greater than 10%. The reasons and solutions are: low vacuum degree, which can be compared with the normal vacuum degree, generally above 40kPa. If the vacuum degree is low, check the reasons for the low vacuum degree.
Poor regeneration of the filter cloth: the filter cloth is not rinsed clean: check the rinsing water flow, pressure, and nozzle to ensure the rinsing water amount.
The scraper removes the remaining filter cloth, and the filter cake effect is poor: adjust or replace the scraper, which should be close to the filter cloth.
Aging of the filter cloth: long-term operation blocks the filter cloth, replace the filter cloth (the filter cloth is replaced approximately every 6 months).
Belt deviation: belt deviation can cause the water outlet hole in the center of the belt to shift towards the center of the vacuum chamber, and the belt hole is covered by the friction belt. At this time, the vacuum degree increases, and the dewatering rate worsens.
Adjust the tension roller, adjust the screws to adjust the belt. Non-compliant slurry: the slurry density is below 40%, and the slurry moisture content is high, with a normal value of 40%-50%. At this time, adjust and check the primary dewatering hydrocyclone to ensure its concentration meets the requirements. Due to the desulfurization process, the slurry quality is poor, and there is always a layer of thin mud on the surface of the filter cake during the dewatering process, with a higher vacuum degree. Based on this, the slurry was sampled and component tested, and adjustments were made to meet the requirements.
Clogged demister: open the inspection port at the top of the gas-liquid separator and rinse the demister with water. Uneven feeding from the feeder leads to uneven filter cake thickness: check if the porous plate inside the feeder is deformed and replace the porous plate. If the filter cake thickness is too thick, greater than 30mm, and the gypsum processing amount exceeds the design value, adjust the slurry amount.
If the dewatering effect is still poor, it is necessary to go to a professional vacuum belt dewatering machine repair shop for maintenance.
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