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    Home > Active Ingredient News > Drugs Articles > Problems that may arise in the production of small spray dryers in the laboratory

    Problems that may arise in the production of small spray dryers in the laboratory

    • Last Update: 2020-11-12
    • Source: Internet
    • Author: User
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    The possible problems and causes and remedial measures in the production of spray dryers are summarized below for reference during operation.
    1, the phenomenon of sticky walls is serious mainly manifested in the drying room everywhere there is sticky wet powder.
    the reasons are: (1) the amount of feed is too large to fully evaporate, (2) the drying chamber before the start of the spray is not heated enough, (3) when the spray starts, the flow of the feed is too large;(4) The added fluid is unstable.
    For the different causes of the above-mentioned problems, the following measures may be taken in turn: appropriate reduction of feed volume, appropriate increase in the import and outlet temperature of hot air, at the beginning of spraying, the flow rate should be small, gradually increased, adjusted to the appropriate time, check whether the pipe is blocked, adjust the material solid content, to ensure the fluidity of the material.
    2, the product moisture content is too high exhaust temperature is the main factor affecting the finished product moisture content, so the cause of the product moisture content is generally too low exhaust temperature.
    and the exhaust temperature can be adjusted by the amount of feed.
    the corresponding measures are to reduce the amount of feed appropriately in order to improve the exhaust temperature.
    3, product purity is low, too many impurities caused by this situation may be caused by the following aspects: (1) poor air filtration effect;
    Available remedial measures are: check whether the filter material in the air filter is evenly laid, filter use time is too long, if it should be replaced immediately;
    4, product powder particles too fine product particles too fine will affect its solubility, punching performance.
    is that the content is too low or the feed is too small.
    remedy is to increase the solidity of the fluid, increase the feed, improve the air inlet temperature.
    5, running powder phenomenon is serious, product yield low running powder loss too much, greatly affecting the yield of the finished product, the general reason is that the cyclone separator separation effect is poor.
    If this happens, check whether the cyclone separator is deformed by knocking or colliding, improve the air tightness of cyclone separator import and export, and check its inner wall and feed port for blockages.
    separation efficiency is also related to the proportion and granularity of the powder, some materials can be added as needed to the second level of dust removal.
    6, centrifugal nozzle speed is too low is mainly centrifugal nozzle components failure, so stop using the nozzle, check the inside of the nozzle.
    7, evaporation is too low may be: (1) the entire system air volume reduction; (2) The import temperature of hot air is low; (3) The equipment has a leak phenomenon, cold air into the drying room.
    the remedial measures are: (1) to check that the speed of the centrifuge is correct, (2) to check that the centrifuge regulator valve is in the correct position, and (3) to check that the air filter and air heater pipes are blocked; (4) Check that the grid voltage is correct; (5) Check that the electric heater is working properly; (6) Check that the connections to the components of the equipment are sealed.
    8, centrifugal nozzle operation, there is noise or vibration mainly due to improper cleaning and maintenance of the nozzle caused by the spray disc with residue or spindle to produce bending and deformation, it may also be the centrifugal disk movement balance is not good.
    solution; check the spray plate for residual substances, if necessary, should be cleaned in time; if abnormal spindles are found, to be replaced; rebalance the centrifugal disk to be rebalanced or replaced.
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