Belarusian National Technical University, Minsk, Belarus:

N. I. Berezovsky, Head of Chair of Mining Machines, Professor, Doctor of Engineering Sciences
N. P. Voronova, Associate Professor, Candidate of Engineering Sciences
V. V. Boriseyko, Senior Lecturer at Chair of Mining Machines, boriseyko.v@bntu.by

The authors propose an efficient flow chart for devaporation heat utilization with a counterflow preheater series-connected with the main heat-exchanger. An emphasis is laid on mathematical methods of determining design parameters of component assemblies in the remodeled dust-exhaust system. From computation of design parameters for dust-exhaust systems of steam tube driers commonly operated at peat briquetting plants in Belarus, it is feasible to use efficiently secondary energy sources in production of peat fuel briquettes, which can enable the product cost reduction in the industry. Integration of a high-performance bag collector in the dust-exhaust system of a single steam tube drier with annual operating time of 7200 h allows minimization of atmospheric emission (18–33 mg/m³), extra briquette production from 17–20 t of collected dust, as well as resource saving (water—18000 t/year, or 393 l per 1 t of briquettes, power—2.45 kW per 1 t of briquettes). Owing to highly efficient scrubbing of dust-and-air mixture, it is possible to connect additionally a steam tube heat-exchanger to the drier outlet, which allows recycling of secondary energy sources such as saturated steam in volume of 180 Mm3/year and condensed water in volume of 34000 t/year.

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