Comprehensive improvement of energy efficiency and environmental friendliness of a solid fuel boiler house

Nizhny Novgorod State University of Architecture and Civil Engineering, 603000, Nizhny Novgorod, Russia

^* Corresponding author: rvkondratev@mail.ru

Abstract

Measures to improve the energy efficiency of boiler houses must be carried out in a complex, taking into account the interconnection of all obtaining heat energyprocesses, their automation and greening. A number of experiments have been carried out on UHFheating, drying and subsequent ignition of various types of solid fuels. Duration determinedUHF-impact and distribution of temperatures on the fuelsurface, depending on its moisture content and fraction. It is proposed to use a pre-combustion device to increase the energy characteristics of fuel with a high moisture content (up to 80%) by combined heating of an electromagnetic fieldUHFand convective thermal - flue gases, as well as a condensing air heater. The results of the pre-combustion device usefor combined heating are: an increase in the drying solid fuelefficiency, an increase in its combustionheat. Homogenized fuel was obtained from low-grade cheap solid fuel with a high moisture content (wood waste), which in its energy characteristics is not inferior to expensive pellets. The joint work of the developed pre-furnace design and the condensing air heater allows: to determine the efficiency factor of a boiler plant, reduce fuel consumption, involve wood waste and low-calorie fuel with a high moisture content (up to 80%) in the fuel balance of boiler houses, recycle and reuse the heat of flue gases, reduce the concentration of corrosive substances in flue gases and condensate, which allows use it as make-up and process water.