SU812769A1 - Method of burning waste water precipitates - Google Patents

Description

one

This invention relates to the treatment of urban and industrial sewage sludge.

There is a known method of burning sewage sludge, including mechanical dewatering, drying the sludge to a wet, grinding- / With subsequent classification, after which the sludge pops into a cyclone furnace for burning 1.

The disadvantage of this method is the complexity of the process of mechanical dewatering, drying, grinding, classification and transportation of sediments, high energy consumption for its implementation and low intensity of evaporation of moisture per unit volume.

The purpose of the invention is to increase the efficiency of use, intensify and simplify the process by eliminating labor-intensive operations of mechanical processing of sediments, saturating them with the hydrogen-oxygen gas phase and using its energy.

The goal is achieved by the fact that sewage sludge is subjected to electroflating compaction, and the resulting foam, saturated with oxygen-hydrogen bubbles, is fed to the incineration.

Sludge to be incinerated or; sludge with a humidity of 98.9-99.9% is subjected to electro-flotation compaction by electroflo

tator hydrogen and oxygen bubbles gas. The dry matter particles of the sediment, adhering to the gas bubbles, are carried to the surface of the sediment in the form of foam with a moisture content of 91-96%. Under

they are pressured directly into the cyclone furnace with a thin jet with a thickness of 1-5 mm. In a cyclone furnace in a stream of mountains, a fuel-air mixture with a temperature of 600-1000 C

the foam pattern is heated, oxygen-oxygen bubbles explode and burn, and thin vapor films enveloping solid particles that prevent the intense evaporation of moisture. As a result

Claims (1)

This forms solid wasp particles; up to 500 microns in size, the drying intensity of which up to 5-40% of moisture per unit increases by 5-10 times. The organic precipitates thus dried are easily combusted. An example. An unconsolidated moisture content of 99% is subjected to electro flotation compaction to a moisture content of 95%. The resulting compacted foam, saturated with oxygen-hydrogen bubbles, is forced through the slots of the pressure cap by an electroflotter at a pressure of 0 atm and sent in a thin stream of 3 mm thickness directly into the cyclone furnace for burning. As a result of heating the foam jet before the furnace with temperature, explosions and combustion of oxygen-hydrogen foam bubbles, solid particles with an average particle size of 300 microns and a humidity of 10% are formed. At the same time, the rate of drying and burning increases by 8 times, the fuel consumption is reduced by 15%. Using the proposed method of burning precipitates reduces fuel consumption by 10-20%. due to the generated additional heat during the combustion of the hydrogen-oxygen mixture of foam and its destruction during explosions of gas bubbles. An increase in the rate of drying and burning corresponds to a decrease in the volume of a cyclone furnace with auxiliary equipment by a factor of 5-10 under the same temperature conditions. Claims The method of incineration of sewage sludge, including mechanical dehydration, drying of sludge, grinding and supplying it to a cyclone furnace for incineration, characterized in that, in order to increase the efficiency of use, intensify and simplify the process by eliminating labor-intensive operations of mechanical treatment of sludge, saturation their hydrogen by the oxygen gas phase and the use of its energy, precipitation is subjected to electro flotation compaction, and the resulting foam, saturated with an oxygen-hydrogen bubble to E is fed for incineration. Sources of information taken into account in the examination 1, USSR Author's Certificate II 361983, cl. C 02 C 3/00, 1970.