Simulation of dynamic modes in regenerative heat exchanger with a rotating disc nozzle
DOI:
https://doi.org/10.31548/energiya2022.03.062Abstract
A significant amount of heat is contained in low-potential steam and gas emissions from the premises, as well as in the spent drying agent of drying units.
Heat exchangers of recuperative and regenerative type (with fixed and rotating nozzles) are used to use the exhaust heat of ventilation emissions.
The aim of the research is to develop mathematical models of non-stationary modes of operation of a regenerative utilizer with a disk rotating nozzle on the basis of simplified physical representations.
Based on the analysis of existing heat recovery units for the use of heat from exhaust emissions and drying agents of dryers with dusty moisture-intensive streams, the feasibility of using a regenerative heat exchanger with a rotating disk nozzle, which is self-cleaning by centrifugal force. A mathematical model of non-stationary mode of heat recovery as an object with distributed parameters is formulated, which allows to determine the influence of design and mode parameters on the efficiency of secondary use of waste heat. To calculate the dynamic characteristics of the regenerative heat recovery unit, a simplified mathematical description in the form of a system of linear differential equations is formulated.
The developed simplified mathematical description of the transient process in the heat recovery unit allows to determine the change of the main parameters in time at the output of the heat exchanger and can be used in the synthesis of the automatic control system.
Key words: heat recovery unit, heat carrier, disk rotating nozzle, thermal mode, mathematical model
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