SU69619A1 - Apparatus for preheating secondary air in a rotary cement kiln, etc. - Google Patents

Description

Devices for preheating secondary air in rotary kilns for cement burning, etc., and for supplying air to the flow of flue gases are already known.

The proposed device differs from such devices in that it is made in the form of several channels concentrically located in the tail part of the furnace, between which there are channels for the discharge of combustion products.

FIG. Figure 1 shows schematically a longitudinal section of a rotary cement kiln, etc., with a device for preheating secondary air; FIG. 2 is a longitudinal section of the air preheater; FIG. 3 shows an AB view of FIG. 2

The housing 10 of the rotary cement kiln is mounted on bearings 15 and is adjacent to the wall 14 of the disposable chamber 7. In the tail part of the furnace, a device 11 for heating secondary air is made, consisting of several concentric channels 2, between which there are channels 3 for exhausting combustion products. Schlamm is supplied through pipe 9 under compressor pressure. Air is supplied by the fan 6 through the air duct 5 to the collector 4. The device 11 is attached to the furnace body by pipes 13. There are asbestos gaskets 16 between the furnace and the air chamber. A burner 1 is located in the front end wall of the furnace.

The external walls of the air channels 2 of the device //, washed by the furnace exhaust gases, are sprayed with sludge supplied through the pipe 9 under a pressure of 1-2 atmospheres. Thus, a rotary cement kiln instead of one surface for drying, located on the inside of its dilindra, has several surfaces evenly spaced across the living section of the kiln tail, with the total surface compared to the existing one increasing two to three times.

The air, the passage through the air ducts, is heated by waste

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