DE102004055133A1 - Method for producing of cement bricks entails delivering raw meal directly to rotary tube connected to calcinator and inside which are feed elements around which flows hot exhaust air from calcinator - Google Patents

Abstract

The method is for the producing of cement bricks, whereby the calcinator (3) is additionally heated, the exhaust gas from the rotary tubular kiln (1) is directed into the dehydrator (2), and the fired brick withdrawn from the kiln via a cooler (4). The raw meal is delivered directly to a rotary tube connected to the calcinator and inside which are feed elements for a forwards and mixing movement of the raw meal. The hot exhaust air from the calcinator is directed around the feed elements in counter-current fashion. An independent claim is included for a device for the carrying out of the aforesaid method in which screw-form plates are fastened on the inner wall of the rotary tube to act as a feed element, or a rotating screw is mounted in a fixed tube.

Description

The The invention relates to methods and apparatus for thermal treatment of cement raw meal for the production of cement clinker according to the main patent AZ 10 2004 023 686.0 dated 13.05.2004. Accordingly, the cement raw meal is granulated, dehydrated or preheated in a traveling grate and completely deacidified in the calciner, whereby the specific heat input for the Clinker is lowered.

According to the parent application the task of molded from raw meal compacts preferred on a traveling grate in the dehydrator, the compacts are here Temperatures around at least approx. 650 ° C up to max. 750 ° C completely drained and then led to the calciner. In the calciner at temperatures of 1100 ° C and more the material is completely deacidified. in the Micro rotary kiln according to the invention or another sintering device is then the residual clinker formation.

The for the Digestion optimally coarsely ground, well homogenized raw meal is before the task in the dehydrator heat exchanger by a special Treatment by means of water and / or a binder such as coke dust and / or oils processed into pellets, the required addition of water exactly over a weight-dependent, automatic dosing of water / raw meal takes place. The pellets are prefers granules with spherical shape in an average size of 10 mm.

The Preparation of the pellets from the raw meal requires a further process stage, which additional Cost be effective. The arranged in the dehydrator heat exchanger traveling grate owns as well a relatively high wear.

OBJECT OF THE INVENTION

The Object of the present invention is thus, while avoiding the production of granules from raw meal. optimal dehydration and preheating for the To create raw meal.

The The object is achieved by the Characteristics of the method claim 1 solved.

The claims 2 to 4 contain device variants for carrying out the Process.

The time for the heat exchange from the entry into the preheater until the Gutaustritt in the rotary kiln is opposite the Cyclone heat exchanger over a thousand times higher. This results in a more compact design and construction of the new system with much smaller volume conversions and therefore also low Construction costs possible and also reduce the radiation losses.

Of the entire content of the aforementioned parent application (description, claims, drawings) as far as it is for the understanding This additional application is also part of this Additional registration.

The Invention is shown schematically in the accompanying 4 figures and described in more detail below.

In the 1 illustrated plant for the production of cement clinker contains a rotary kiln 1 and is with a dehydrator 2 and a calciner 3 provided as a heat exchanger. The dehydrator 2 is in this case a rotating, horizontal heat exchanger. The fuel inputs take place with 5 in the rotary kiln 1 and 6 in the calciner 3 , That from the calciner 3 , a rotating, inclined heat exchanger, coming good is in the rotary kiln 1 , the kiln exhaust directly into dehydrator 2 guided.

The 2 shows a static, vertical heat exchanger with internals.

The 3 shows the components required for heat recovery of the jacket radiation losses, such as the helically placed on the coats snail-shaped sheets (which may also be individual wings) and the fixed, non-co-rotating jacket of the hot air collecting ducts 2 ' . 3 ' and 1' , The collection channels are free in the area of the respective role stations for the free access of the stations down, this right picture 4 (Air passage in hatched area). From the mill or dryer fan is via the open collecting channel 2 ' , on this left picture 4 (shaded area), fresh air sucked in and over the collecting channel 1' supplied from the heat recovery system of raw meal drying or other heat recovery.

1

Rotary kiln (Secondary oven)

1'

Collecting channel too 1

2

dehydrator

2 '

Collecting channel too 2

3

calciner = Primary oven

3 '

Collecting channel too 3

4

tube cooler

5

Fuel input QI

6

Fuel input QII

Claims (4)

A process for producing cement clinker, wherein the calciner additionally heated, the exhaust gas of the rotary kiln is fed into the dehydrator and the burned cement clinker is discharged from the rotary kiln via a cooler, characterized in that the raw meal directly one, a calciner ( 3 ) upstream rotary tube ( 2 ) with arranged in the interior conveying elements for a forward and mixing movement of the raw meal and the hot exhaust air from the calciner ( 3 ) is passed in countercurrent to the conveying elements. Device for carrying out the method according to claim 1, characterized in that in the rotary tube ( 2 ) attached as a conveying element on the inner wall helical plates or a rotating screw is mounted in a fixed tube. Apparatus according to claim 2, characterized in that the rotary tube ( 2 ) or fixed tube horizontally, or is arranged obliquely. Apparatus according to claim 2, characterized in that in a fixed, vertical tube ( 2 ) helical plates are firmly installed.