Studies on efficiency of automated dust retention installations from compound feed factories
2021
Vasile, C., University of Craiova (Romania) | Glodeanu, M., University of Craiova (Romania) | Saracin, I., University of Craiova (Romania) | Glodeanu, A., University of Medicine and Pharmacy, Craiova (Romania)
The first stage in the flow of activities carried out in a compound feed factory involves grinding of cereal grains in order to mix the obtained flour with other ingredients in the recipe that will be produced. The paper presents some aspects of interest about the technological process of preparation of compound feeds, with emphasis on the grinding phase, as well as a study of the process of removing dust from the air circulated in the installations and technical equipment used. The dust resulting from the grinding process, or from granules sterilized with hot steam jets and then cooled with air jets, tends to be released in the atmosphere, and if it is not retained immediately, the air in the workroom will be polluted, endangering the health of the operators. That is why there are increasingly strict rules and laws, which limit the emission of dust in the atmosphere in order to achieve adequate protection of the environment. Thus, the retention of dust before its elimination in atmosphere is a necessity that must be taken into account when equipping compound feed factories with high-performance installations, with a high degree of automation, provided with special dust filters. These equipments ensure the separation of the air from the solid particles contained, so that the clean air can be released in the atmosphere, and the solid materials are recovered and then reintroduced in the technological process. The research presented in this paper was performed for two types of mills used in the installations, with which the compound feed factories are equipped: double mills with rollers and hammers, or single mills with a circuit for grinding larger particles that do not pass through the sieve. The experimental measurements were performed with the Strohlein gas detector for different recipes of compound feeds produced and showed that the values of dust concentrations are not exceeding 2 mg/m3 N, thus complying with the European environmental protection standards.
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