Energy-efficient modes of drying of colloidal capillary-porous materials
energy-efficient drying regimes, capillary-porous materials
Abstract
The processes of convective drying are among the most energy intensive industrial processes. The energy consumption for moisture removal reaches 3000 - 5000 kJ/kg or more, therefore the decision to reduce energy consumption during drying is an actual scientifi c and technical task. One of the ways to solve this problem is to develop energy-efficient drying regimes.
Analytical calculation of the process of drying of colloidal capillary-porous materials is quite complicated, because it is necessary to know a number of individual values for this product. In this work, the process of convection drying of organic colloidal capillary-porous material was investigated. The process is investigated experimentally using mono-raine and composition in a certain ratio of materials. As a significant increase in the energy costs of drying is usually associated with the complexity of removing moisture from the material, the kinetics of which is due to the mobility of water molecules and the energy of their interaction with other molecules, so it was important to study the changes in the specific heat of evaporation of water from mono-reagents, сompositions from them.
In the course of the research, new regularities were established and synthesized when drying composite raw materials. The heat of evaporation of mono and composite raw materials is determined, which is less in the composition than in the mono-raine. For the organization of the economic and energy process of drying organic colloidal capillary-porous raw materials and improving the quality of the dry product, it is most appropriate to create compositions and to use step-by-step modes of the energy trailer with a decrease in the temperature of the coolant with a decrease in the moisture content of the material.
Calculated intensity and duration of dehydration of mixtures.
The density of heat flux is calculated, which is spent on evaporation of moisture depending on the intensity of evaporation and the moisture content of the material.
Investigated the dependence of the Rebinder (as a drying optimization criterion) on the moisture content of the material, which substantiates the effectiveness of the proposed stepped drying regimes.
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