Improvements in the automation of powder raw material feeding in production
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In the production of polyester polyols, the feeding of adipic acid is currently done manually by crane, which generates a lot of dust and results in a very poor working environment. Do you all have any good suggestions?
Change it to a closed feeding conveyor belt like those used in cement factories.
Pneumatic conveying, sealed powder feeding machine. For automation, pneumatic conveying is easier to control, but it is costly; moreover, adipic acid, which is crucial in this process, poses a risk of dust explosions.
Diaphragm pumps can also be used for transportation.
Cost is not an issue. . Dust explosions are too dangerous. .
Personally, I think mechanical improvements, such as automatic lifting and feeding, as well as dust negative-pressure treatment, hold some promise.
I’m not sure about the feeding height, feeding amount, and feeding time mentioned by the original poster. Adipic acid is in powder form and prone to dust generation. Pulling vacuum while feeding material can easily cause blockages in the feed process ； If a vacuum is not created, the feeding environment becomes poor. In the case of continuous production, the temperature inside the reactor is relatively high; coupled with the static electricity generated by friction against the packaging bags, the possibility of a dust explosion during material feeding is quite high. Therefore, it is recommended to use vacuum material suction, with the pipeline inserted below the liquid surface, in order to reduce dust generation and lower dust concentrations. The kettle in the same space cannot be stirred to prevent sparks from being generated by friction.
At present, we use silo storage along with nitrogen-circulated pneumatic conveying； Main pain points in the transportation of adipic acid: 1. Dust is prone to explosion ； 2. Prone to caking and clumping ； Compaction is relatively more problematic, so the storage capacity in the silos should not be too large; it’s necessary to accelerate turnover and add more crushers.
Just use a screw conveyor for sealed negative-pressure transportation