SU1740343A1 - Method of utilizing exhaust gases in roasting portland cement clinker - Google Patents

Abstract

SUMMARY OF THE INVENTION: The method involves the utilization of heat from excess waste gases. When the heated air from the clinker cooler to the rotary kiln is supplied, the excess air ratio of the gaseous medium is maintained at 1.30-1.50, and the weight of the smoke exhauster evacuating gases from the kiln increases proportionally to the excess air ratio. The invention is aimed at accelerating the decarbonization of raw materials and the disposal of flue gases. 1 il.

Description

The invention relates to the production of cement clinker and can be used in various methods for producing cement. The most acceptable is the invention in the production of cement on the kilns of the wet method of clinker burning.

The closest to the technical essence is a method by which, for the most complete utilization of the heat of the aspiration air, a part of it is fed to the cold end of the rotary kiln. At the same time, the heated gases (aspiration air) are fed either directly to the start of the chain curtain behind the pipe of supplying sludge to the furnace, or behind the chain curtain to the zone of the end of dehydration of the raw mix.

The purpose of the invention is to accelerate the decarbonization of raw materials.

This is achieved by the fact that the excess air ratio of the gaseous medium in the rotary kiln is maintained within 1.30-1.50. A smoke exhauster evacuating excess waste gases increases in proportion to the value of the excess air ratio.

To improve the thermal dissociation of calcite, it is necessary to ensure the continuous removal of gaseous reaction products - C02 from the bed of the calcined material.

PRI me R. The drawing shows a device for implementing the method.

The device includes a slaker 1, connected by a slurry pipe 2 to a rotary kiln 3, the hot end of which enters the hot end 4, connected to a cooler 5, inside of which are grate 6 (sharp blowing and regular, located in the spacer). Connected to fans 7 and 8 with a sharp and general blow. The flue 5 is fitted with a flue 9 leading to an accumulator of cyclones 10 from which the flue 11. extends to the aspiration fan 12 from which the flue 13 goes to the chimney 14. At the opposite end of the furnace 3 a dust chamber 15 is provided for large fractions taken out of furnaces of dust connected to electrostatic precipitators 16 and through them with baking smoke exhausters 17 leading to exhaust chimney 18

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flue gas into the atmosphere. The electrostatic precipitators 16 are connected to the augers 19 and 20 and further by an assembly screw 21 to remove the dust accumulated in them. A gas burner 22 is introduced through the hot end 4 into the rotary kiln 3. In the refrigerator 5, a crusher 23 is provided, from which there is an exit to the clinker conveyor 24. The hot end 4 of the rotary kiln 3 is connected to the aspiration fan 12 of the cooler 5 by a flue 25. For regulation The suction air supplied to the furnace shaft 3 serves as remote-controlled gates 26 and 27. A scalding collector 29 is installed on the rear outer wall 28 of the hot end 4 of the furnace 3, from which air tuyeres 30 pass through the wall 28.

The method is carried out as follows.

Raw sludge from schlampitel 1 through the sludge pipe 2 enters the furnace 3 and after passing through the furnace in the form of clinker with a temperature of 1100-1300 ° C enters the refrigerator 5 on the grates with grate 6, through which air is supplied from an acute ventilator blow 7 and fan general blow 8.

For supplying aspiration air to the hot end shaft 4, furnace 3 closes gate 26 while simultaneously opening gate 27. By adjusting the degree of opening of the blades 26 and 27, the amount of air supplied to the furnace is adjusted at a given limit of excess air ratio 1.30-1.50. By adjusting the degree of opening of the gates on the baking smoke exhausters 17, the required negative pressure at the hot end 4 of the furnace 3, which should not be less than 5 mm of the water column.

Claims (1)

Invention Formula The method of utilization of waste gases during the firing of portland cement clinker by supplying the waste gases from the clinker cooler to a rotary kiln, characterized in that, in order to accelerate the decarbonization of raw materials, the air ratio of 1.30-1.50 is maintained in a rotary kiln an increase in exhaust smoke evacuation of excess exhaust gases is proportional to the coefficient of excess air. Ton / tula Air