Device for Pre-Heating Cement Raw Meal for Cement Clinker Production

Abstract

The device for pre-heating cement raw meal for the cement clinker production comprises at least one heat exchanger line for charging cement raw meal in countercurrent flow to the hot gases drawn through the heat exchanger line and a supporting structure (19) for the at least one heat exchanger line, wherein the heat exchanger line comprises a plurality of heat exchangers (8, 9, 10) which are interconnected and through which flow can pass consecutively. The supporting structure (19) comprises stands (20) which jointly form a triangular outline (21) and serve to transfer load into at least one foundation.

Claims

1. A device for pre-heating cement raw meal for cement clinker production comprising at least one heat exchanger line for charging cement raw meal in countercurrent flow to hot gases drawn through the heat exchanger line; and a supporting structure for the at least one heat exchanger line, wherein the heat exchanger line comprises a plurality of interconnected heat exchangers through which flow can pass consecutively, and the supporting structure (19) comprises stands (20) which serve to transfer load into at least one foundation and jointly form a triangular outline (21).

2. The device according to claim 1, wherein the supporting structure comprises three stands (20) arranged in a triangle (21).

3. The device according to claim 1, wherein the stands (20) essentially extend beyond the height of the heat exchanger line.

4. The device according to claim 1, wherein the stands (20) are arranged to transfer the main load of the heat exchanger line into the at least one foundation.

5. The device according to claim 1, wherein the stands (20) are hollow in design.

6. The device according to claim 1, wherein the stands (20) are arranged inclined towards each other.

7. The device according to claim 6, wherein the stands (20) are each inclined at an angle of 1-10 to the vertical.

8. The device according to claim 1, wherein the device further comprises struts or platforms for interconnecting the stands (20) to each other.

9. The device according to claim 1, wherein the heat exchangers comprise gas-suspension heat exchangers.

10. The device according to claim 1, wherein the heat exchangers project beyond the triangular outline (21) with part of their volume.

11. The device according to claim 1, wherein only one heat exchanger line is supported by the supporting structure (19) with its stands forming the triangular outline (21).

12. A combination comprising a first device for pre-heating cement raw meal for the cement clinker production comprising at least one heat exchanger line for charging cement raw meal in countercurrent flow to hot gases drawn through the heat exchanger line and a supporting structure for the at least one heat exchanger line, wherein the heat exchanger line comprises a plurality of interconnected heat exchangers through which flow can pass consecutively, and the supporting structure (19) comprises stands (20) which serve to transfer load into at least one foundation and jointly form a triangular outline (21) with, directly adjoining it, at least one further device, for pre-heating cement raw meal for the cement clinker production comprising at least one heat exchanger line for charging cement raw meal in countercurrent flow to hot gases drawn through the heat exchanger line and a supporting structure for the at least one heat exchanger line, wherein the heat exchanger line comprises a plurality of interconnected heat exchangers through which flow can pass consecutively, and the supporting structure (19) comprises stands (20) which serve to transfer load into at least one foundation and jointly form a triangular outline (21), wherein two stands (20) of the supporting structure (19) of the first device are at the same time stands (20) of the supporting structure (19) of the further device, wherein the first device and the at least one further device only have one heat exchanger line, respectively.

13. The combination according to claim 12, wherein the combination comprises two devices, wherein the two triangular outlines (21) of the two devices jointly from a rhombic outline.

14. The device according to claim 2, wherein the stands (20) essentially extend beyond the height of the heat exchanger line.

15. The device according to claim 14, wherein the strands (20) are hollow, are inclined towards each other, and are at an angle of 1-10 to the vertical.

16. The device according to claim 15, wherein a portion of the heat exchangers extend beyond the side edges of the triangular outline (21), and the heat exchangers comprise gas suspension heat exchangers.

17. The device according to claim 8, wherein the struts or platforms are arranged within the triangular outline (21).

18. The device according to claim 9, wherein the gas suspension heat exchangers comprise cyclone separators.

Description

[0022] The invention will be explained below in more detail with the aid of the figures shown schematically in the drawing. FIG. 1 shows a cement clinker production plant according to the prior art, FIG. 2 a first embodiment of a heat exchanger tower according to the invention and FIG. 3 a second embodiment of a heat exchanger tower according to the invention.

[0023] A cement clinker production plant is schematically shown in FIG. 1, in which at point 1 charged raw meal is preheated in a preheater 3 in countercurrent flow to the hot exhaust gases of a clinker kiln 2 and calcinated in a calcinator 4. The clinker leaves the clinker kiln 2 at point 5 and is cooled in a clinker cooler 6. The cooled clinker leaves the clinker cooler 6 at point 7.

[0024] The preheater 3 can comprise one or more heat exchanger lines. In the drawing one line is shown. The line has a plurality of cyclone gas suspension heat exchangers connected one after the other, wherein the first gas suspension heat exchanger is designated with 8, the last gas suspension heat exchanger with and the gas suspension heat exchanger arranged in between with 10. The kiln fan 11 produces the required negative pressure so that the kiln exhaust gas emerging on the hot meal output side 12 of the clinker kiln 2 is drawn through the calcinator 4 and the consecutively connected gas suspension heat exchangers 8, 10, and 9 and the hot gas extractor 13.

[0025] Fuel is supplied to the firing of the clinker kiln 2 as shown schematically with 14. The fuel supply for the firing of the calcinator 4 is shown schematically with 15.

[0026] The clinker cooler 6 has a plurality of fans 16 via which ambient air is blown in. The air passes through the clinker cooler 6 and leaves the clinker cooler 6 via the tertiary air extractor 17 and the tertiary air duct 18, wherein the tertiary air duct opens out into the calcinator 4.

[0027] Shown in FIG. 2 is an outline of a heat exchanger tower for preheating cement raw meal according to the invention. It can be seen that the heat exchanger tower has a supporting structure 19, which comprises three vertical stands 20, which in outline form a triangle 21. Arranged within the triangular outline of the supporting structure 19 and supported on the supporting structure 19 in a manner not shown in more detail, is a heat exchanger line consisting of a calcinator 4 and a plurality of heat exchangers 8, 9, 10, more particularly cyclone separators.

[0028] FIG. 2 shows that on the hot meal charging side the clinker kiln 2 is connected to the calcinator 4. The heat exchangers 8, 9 and 10 are arranged as shown in FIG. 1, wherein the path of the kiln exhaust gas from one heat exchanger to the next is schematically shown by arrows. The heat exchangers 8, 9 and 10 are essentially arranged in a central symmetrical manner about a central axis.

[0029] For comparison the outline of a conventional rectangular supporting structure of a heat exchanger tower as dimensioned in accordance with the prior art for accommodating the heat exchanger line shown in FIG. 2 is shown with a broken line 22. It can be seen that with the embodiment according to the invention the outline, and thereby the structural volume, can be considerably reduced.

[0030] In the embodiment according to FIG. 2 the calcinator 4 and the heat exchangers 8, 9, 10 of the heat exchanger line are arranged with their entire volume within the triangular outline 21. Only working areas, staircases or other structural entities used for inspection and maintenance etc. can be arranged outside the outline 21. The outline can be reduced even further if it is acceptable that with part of their volume the calcinator 4 and the heat exchangers 8, 9 and 10 project beyond the triangular outline, as shown in FIG. 3.