Математична модель сушіння рослинної сировини в обертальному барабані за комбінованого підведення енергії

Р. А. Калініченко, Б. І. Котов, А. В. Спірін



R. A. Kalinichenko, B. I. Kotov, A.V.Spirin


Introduction. Drying is an industrial way of preserving wet dry plant materials and products in relation to the volume of drying grain, seed and feed materials is a significant share in agribusiness production areas. For the drying of the diversity of agricultural raw materials in bulk or crushed (to provide agglomeration) as the most widely used universal drying machine drum and pneumatic drum type. In the latter type material units during pouring the rotation of the drum moves under the influence of the drying agent. Domestic industry and foreign manufacturers for agriculture produces a large number of models of this type dryers. But for a number of performance indicators (cost per unit of energy, the level of automation, the implementation of environmental requirements, etc.), these dryers do not completely meet the current requirements of agricultural and processing industries.

Significant energy consumption for evaporation of material due to costly heat in the environment, such as the cost of heat from the spent drying agent and heat transfer through the surface of the drum into the environment. Ways to reduce these types of energy loss is to reduce the total drying agent, which can be reached directly supply extra energy in the drying zone through a special heating elements - IR emitters. But the use of this method of drying process is constrained by the lack of settlement of mathematical models of heat and mass transfer in the drying drum units in the presence of additional sources of infrared radiation in local areas dryers.

Analysis of recent researches and publications. In existing publications, enough material for calculation of heat and mass transfer, and movement of material in the settings drum drying agricultural and food materials. The efficiency of the use thermal radiation energy supply drying drums. The main advantage of such schemes drying process is more efficient transfer of heat to the material and the opportunity to influence the temperature distribution of material along the length of the drum. However, in certain jobs impact local IR to supply material impact while moving the drying agent is not considered a mathematical description of processes available.

Purpose. Improving the mathematical description of heat and mass transfer during drying material in a rotating drum in the presence of sources of infrared radiation.

Materials and methods of research. Specificity developed by question determines the feasibility of using as the main analytical calculation method study of heat and mass transfer in drying particulate material in the drum units. Since the mathematical description used to determine rational modes of dryers in stationary and transient (speaker output on sustainable mode) processes assume that examines specific drum with a combined blade and distribution nozzle with known geometrical parameters. The problem with the study is to determine the impact of power and its distribution on the processes of heating and drying the material. Taking into account ramjet movement of the drying agent and material hydraulic circuit of the unit responsible model of ideal displacement.

Results. To compile the mathematical description make appropriate assumptions to simplify the design of a process, but do not distort the physical nature of phenomena: thermal properties transported environments and elements of construction the drum, thermal conductivity along the radius and length do not count; heat radiating element is concentrated in a domestic capacity; all kinds of heat captured heat transfer coefficients that are independent of temperature; heating material and construction without gradient; distribution parameters of one-dimensional in the direction of the material and drying agent (OY).

When using zonal radiation material when the IR emitter is placed in a drum in a certain zone must also have a mathematical description of drying drum with no radiator and availability nozzle.


The mathematical description of dynamic modes of loose material in the rotary drum with combined convection-radiation energy to supply material distributions taking into account parameters of the length of the drum.

The equations can be used for process analysis and optimization of operating parameters with known values of design parameters.

Повний текст:



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