Condições do ar intergranular em silos bolsa

Abstract

Brazil and consequently Mato Grosso, the state responsible for much of the country's grain production, face a major storage problem, due to the deficit in static storage capacity. Thus, it is necessary to search for storage alternatives to provide an increase in national static capacity. The bag silo, a versatile storage option, consists of layers of polyethylene and characterized as a hermetic system. Thus, the objective was to carry out the study of the internal conditions in bag silos. The study consisted of storing corn in two silos of different external colors (white and pink), with monitoring of intergranular air conditions by means of probes equipped with temperature, relative humidity and carbon dioxide sensors. The data obtained were worked on a free license for testing MATLAB. Through the results obtained, it was found that external climatic conditions have a greater influence on the upper layer of the mass of grains stored in bag silos, and have almost no influence on the intermediate and lower layers. The superficial accumulation of water in the soil, observed near the white bag silo, did not interfere in the relative humidity of the intergranular air, however, there is a possible influence on the temperature at 100 cm deep in the grain mass. Due to the CO2 concentration of the pink bag silo, the grains were in unsafe storage conditions, as there was a continuous increase in carbon dioxide inside the bag silo. The entry of rainwater into the pink bag silo, at the time of pocketing, influenced the respiratory activity of the grains, promoting greater release of CO2. There was no probability of intergranular air condensation in the two evaluated silos.