Abstract
Waste material from the meat industry can be taken into account as a biofuel. Studies confirm, that calorific value is higher and ash content is lower comparing to some conventional fuels. EU directives regulate details of thermal disposal of the waste material from the meat industry - especially in range of the process temperature and time of the particle presence in area of the combustion zone. The paper describes design of the rotating drum grate stove, dedicated to thermal disposal of the meat wastes as well as solid biomass (pellet, small bricket, wood chips) combustion. Device has been developed in frames of cooperation between AGH University of Science and Technology (Krakow, Poland) and producer focused on technologies of energy utilization of biomass in distributed generation. Results of measurements of selected operational parameters performed during startup of the furnace have been presented and discussed. Furthermore, numerical model of the combustion process has been developed to complement experimental results in range of the temperature and oxygen distribution in the area of the combustion chamber. ANSYS CFX solver has been applied to perform simulations including rotational domain related with specifics of operation of the device. Results of numerical modelling and experimental studies have been summarized and compared.
Highlights
Waste material from the meat industry is characterized by a high content of organic matter, from 50%, to almost 80%
As a result of the simulations, it was found, that meat and bone meal (MBM) combustion gives a lower gas temperature than coal combustion. This is due to the some parameters of the waste-derived fuel, such as higher moisture and ash content, and lower oxygen content compared to the coal
The results show, that more stable conditions of combustion process can be achieved by shortening the length of periods between rotations of the grate, so it can be concluded, that continuous operation would be the most efficient
Summary
Waste material from the meat industry is characterized by a high content of organic matter, from 50%, to almost 80% This is extremely important for the natural environment, due to bacterial and epidemiological risk [1]. As a result of the simulations, it was found, that MBM combustion gives a lower gas temperature than coal combustion. This is due to the some parameters of the waste-derived fuel, such as higher moisture and ash content, and lower oxygen content compared to the coal. Lower particle size and temperature in MBM combustion process results in poor char burnout, but due to the low content of fixed carbon, the impact on gas temperature is insignificant
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