BURNING OF WATER-FUEL EMULSION FROM PAINT INDUSTRY WASTE

The article reviewed the results of water-fuel emulsions combustion, which are created on the basis of paint industry waste. They are created by mixing a contaminated solvent (with 65-80% methyl acetate or acetate) and reflux water. A feature of the considered emulsions is a high water part (about 50%). Combustion is possible under the action of a high-frequency electric discharge. Emulsion drops are heated and a micro-explosion phenomenon may occur, when steam bubbles form in the water granules in the emulsion drop. It upon rapid expansion, break the initial drops into even smaller drops. This stimulates the microdroplets combustion of flammable liquid and the water vapor formation. In this way, it is possible to burn organic waste with “dirty water”. Experiments were conducted in several stages. At the first stage, the combustion of the original fuel (waste) was studied in a Petri dish, where the effect of high-frequency discharges on increasing the burning rate was shown. The emulsion was created by mechanical mixing of liquid fuel and water. Active emulsion combustion in the industrial burner was observed only when the high-frequency discharge generator was operating. The disadvantage is the need for preliminary mechanical cleaning of waste. The nozzle and filters in the pumps could fail. An alternative is the separate supply and spraying of fuel and water. Thus fire method of cleaning and processing non-flammable waste water has been implemented. Steady combustion of the main fuel and steady spraying of reflux water and its subsequent fire cleaning are observed. The length of the torch is 3 m. Estimates of gas composition during complete combustion of such emulsions, as well as air flow, were made. Taking into account the combustion of polyester resins, which contains paint industry waste, indicates that the volume of combustion emulsions products increases almost 1.5-2 times more than the volume of primary air. The main amount of combustion products is nitrogen of primary air (about 50%) and water vapor (about 40%).