SU1616869A1 - Method of producing cement clinker - Google Patents

Abstract

The invention relates to the building materials industry, primarily to the production of cement clinker in a rotary kiln. The aim of the invention is to reduce energy costs. In the claimed method for producing cement clinker, sludge is fed in two streams, one of which is dehydrated and the resulting cake with a moisture content of 15-22% is mixed with slag, then the mixture is fed along the axis of the furnace into heat exchange devices, followed by mixing the mixture with another stream of dried sludge before loss its plasticity. Heat consumption for clinker burning is reduced by 13.5 kg of equivalent fuel per 1 g of clinker. 1 il.

Description

The invention relates to the industrial construction materials, mainly to the production of cement clinker in a rotary kiln.

The aim of the invention is to reduce energy costs.

The drawing shows the implementation of the method.

The method is carried out as follows.

From the horizontal sludge pool 1, the prepared sludge leaves two streams. One stream by the dosing pump 2 is directed through the feed tube 3 directly to the initial section of the heat exchanging devices 4 of the rotary kiln 5 | The second stream of sludge enters the press filter section 6 and leaves it in the form of a cake with an initial moisture content of 15-22%, entering through the conveyors 7 into the charging device 8. The same device 8 via the conveyors 7 enters granulated slag from tank 9 mixing with cake. The resulting mixture is supplied to a transport pipe 10, which is installed inside the heat exchanging devices 4 coaxially with the body.

furnace 5 and has an internal surface in the form of a spiral.

Due to the rigid attachment of the transfer pipe 10 to the furnace body 5, it rotates with it, contributing to the advancement of the mixture of cake and slag along the axis.

In this case, the pipe 10 is made of such length that it could provide

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the mixture of cake and slag in the slurry until its plasticity is lost for mixing. I The resulting mixture is fed further to the calcining.

Humidity of sludge within 15-22% is associated with optimal values of technical and economic performance of filters and the mechanism of material movement in the working volume of the furnace: As it follows from the performance formulas, when the cake moisture is below 15%, the process of cement raw material production mixtures become: unprofitable.

Having reached a moisture content of 14%, the sludge loses its plasticity and stickiness properties. From this point on, the material moves as a loose body and its mixing with the cake is permissible.

Using the proposed method will reduce energy consumption, mainly in the reconstruction of cement plants with a wet production method, due to a significant decrease in the moisture content of the raw cement mixture,

Claims (1)

Invention Formula An increase in moisture above 22% can lead to an excessive consumption of heat for the evaporation of physical water of the cake and the material being coated with heat exchangers. When feeding sludge into the chain zone, the heat exchanger evaporates water and additive from the fine-dispersed gases. When the moisture content of the sludge becomes less than 24%, it turns into a viscous doughy mass, which sticks to the inner surface of the furnace and chains, forming a lump. A method for producing cement clinker by supplying sludge and slag to the cold end of a rotary kiln and subsequent calcining, characterized in that, in order to reduce energy costs, the sludge is fed in two streams, one of which is dehydrated, and the resulting cake with a moisture content of 15-22% is mixed with slag , then the resulting mixture is fed along the axis of the furnace to heat exchange devices, followed by mixing the mixture with another stream of dried sludge until it loses its plasticity. (see Clinker