Traditional method of liquid waste fire processing includes contact boiling of liquid waste by a flue gas released in a combustion furnace, disposal of minerals from the flue gas, fuel and air supply to the furnace to burn boiled waste, discharge of melted minerals, and heating of the air with the flue gas.

In the newly-developed method, flue gas, having heated the air, is delivered to a contact-type boiler. Air heating is a two-stage process: at the first stage, flue gas heats a part of the air in a one-through flow; at the second stage, flue gas heats the other part of the air in a counterflow. Flue gas, leaving the boiler in which it’s boiled down to remove minerals, is conditioned by mixing with the first stage hot air before the treatment. One part of the second heating stage air flow is mixed with a fuel and fed to the furnace for combustion. The other part of the said air flow is used to carry dry minerals, withdrawn from flue gas, to the furnace. Air-fuel mixture is delivered to the furnace upper part. Dry minerals and boiled waste are fed together with air flow to the combustion zone located in the furnace lower part. Air-fuel mixture is directed to the above-melt zone to supplementary burn underburnt products.

Two modification of the new method are available.

In the first modification of the new method, an air carrying dry minerals is used to oxidize inorganic components of boiled waste in combustion process. In the second modification of the new method, a share of minerals, withdrawn from the flue gas in the contact boiler, is regulated by pressure alteration of liquid waste entering boiling process, depending on concentration of minerals in the boiled waste.

Volkov V.I.

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