The solution of environmental problems in the manufacture of instant tea

In the conduct of many processes, including during operation of the drying equipment is well proven two-stage purification scheme of the coolant, including units for dry and wet cleaning emissions. This article was reviewed the system of purification of air of the shop of drying specializing on production of food powders on the example of powder of soluble tea. Detected locations the emission of dust in shop of drying, by production of soluble food powders, parameters of the fulfilled dryer heat carrier are determined, physical and structural and mechanical properties of the received product are analyzed, and also overall performance of the means of purification of air existing at the enterprise is defined. It is revealed that when drying this powder emissions contain a big share of fine fraction of the dust possessing high hygroscopicity and big adhesive ability and use of the hose filter as the second step of cleaning is inadmissible. The average value of catching the cyclone was in the range of 72-76 %. This is due to the fact that this dust is characterized by the presence of a large percentage of the fine fraction, which is poorly captured by the centrifugal dry cleaning apparatus. After analyzing the effectiveness of existing treatment systems, it is possible to draw a conclusion about inexpediency of its use in the enterprise when the dust dispersed composition of this and the need to develop other, better and more effective option. Used conical cyclone is not very effective device for cleaning of coolant from fine dust, so its use is possible only as the first stage of two-stage air purification. From the obtained results it follows that the existing air cleaning system did not provide the required efficiency. To ensure the required level of purification of exhaust air should take into account the special properties of the dusts of a particular production. As the second stage in this case, with regard to the specific characteristics of this type of dust, it is advisable to use wet types of cleaning. It was suggested use for cleaning of the heat carrier of the wet device of centrifugal and inertial action is offered. The presented generalized characteristics of dust can serve as the material allowing to estimate danger degree in the sanitary and hygienic relation of this or that technological process and are basic data for calculation of an efficiency of the operating clearing equipment and design new.