ELECTROTECHNOLOGICAL METHOD OF CONTROLLING BURNING IN PYROLYS BOILERS

The electric field has a significant effect on the speed and character of the combustion of solid fuels. Depending on the field strength and polarity of the electrodes, both an intensifying and an inhibiting effect can be achieved. The dependence of the combustion parameters on an electric field can be used in pyrolysis boilers. The first stage of fuel combustion in such boilers is carried out with insufficient oxygen, which is accompanied by the release of carbon monoxide and the risk of its penetration into the room. At the same time, an increase in the oxygen content leads to fuel ignition and pyrolysis disturbance. As a result of the experiment, it was found that a decrease in the oxygen content can be replaced by the action of a longitudinal electric field with a strength of 1 to 7 kV/cm. With such an effect, combustion is suppressed (there is a flame failure) due to the termination of fission chain reactions of charged radicals of ignited substances. At the same time, the release of carbon monoxide does not increase. The electrotechnological method of combustion control is techinically implemented using an industrial solid fuel boiler of low power. An experimental sample of this boiler is equipped with a box-shaped reservoir for burning solid fuel, made of a conductive material. Above the reservoir, there is a grid electrode able to move relative to the reservoir with the help of a controlled electric drive. When a flame appears, the voltage between the reservoir and the grid electrode increases, and the distance between them decreases. The strength of the longitudinal electric field increases, which leads to the suppression of the flame and the pyrolysis mode restoration.