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Benchtop and floor-standing air blasting oven is one of the most used drying equipment in pesticide factory.
Box type drying oven is a small investment, easy operation, convenient variety
replacement and small tail gas treatment capacity. Suitable for small batch,
regular variety change, intermittent production occasions. However, it belongs
to static intermittent drying, the traditional equipment has poor working
conditions, large labor intensity and long production cycle. Although the
operating temperature is not high, it is easy to overheat the dry material
because the material is subjected to the same temperature for a long time. General
products after drying but also after crushing, also not suitable for the
production of large tonnage products. Box dryer also has two types of parallel
flow and through flow. The former is mainly used for drying paste materials,
and the flow box dryer is mainly dried by hot air through the surface of wet
materials. When the hot air passes through the wet material surface, the
surface material is heated and the moisture vaporizes first. Due to the
humidity difference inside and outside the material, the internal moisture
moves to the outside and vaporizes, repeating the above process to dry the
material. Through flow box dryer is hot air vertical through the material,
mainly used for block and granular material drying. Compared with the parallel
flow box dryer, the drying time is shorter and the production efficiency is
higher. Most pesticide plants use the method of placing the tray on the steam
pipe, turning the material manually at regular time, and heating and drying
under static condition. This method must have high labor intensity, more
importantly, the inhomogeneity of material drying is inevitable, the product
quality can not be guaranteed, and the energy loss is very large. The thermal
efficiency of this box dryer is not more than 20%.
In recent years, the drying oven manufacturer have
carried on the technical transformation to the box type precision
oven, mainly has made the improvement in the following several
aspects.
First, the tray of box dryer adopts cart type, and
multi-layer tray is placed on the cart, which improves the working efficiency
and reduces the labor intensity.
Secondly, using forced hot air circulation,
the temperature in every corner of the dryer is basically the same, which not
only ensures the uniformity of moisture and quality of the product, but also
greatly improves the working efficiency and thermal efficiency. Although the
box drying oven is the original, old drying equipment, but also practical can’t
be eliminated, it has other drying equipment incomparable advantages.
Therefore, although many new drying devices have been
developed, there is still no sign of withdrawal. The automatic temperature
regulating system and ventilation system of box dryer should be further
developed. The gas relative humidity measuring instrument is installed at the
outlet of the gas discharge, and some hot air circulation is adopted to correct
its shortcomings as far as possible, so that this old equipment can play a new
role.
