Multi-stage cement calcining plant suspension preheater

Patent metadata

Field	Value
Publication number	US-10598434-B2
Application number	US-201615753049-A
Country	US
Kind code	B2
Filing date	Oct 6, 2016
Priority date	Oct 8, 2015
Publication date	Mar 24, 2020
Grant date	Mar 24, 2020

Abstract

The invention relates to multi-stage cement calcining plant suspension preheater of the kind mentioned in the introduction, wherein the preheater comprises a top separator comprising a central tube entering the top separator in a lowermost part of the separator housing whereas the central tubes of the bottom separators enters the separator housing in an upper part of the separator housing.

First claim

The invention claimed is:

1. A multi-stage cement calcining plant suspension preheater comprising:
a plurality of stages each of which has a separator for separating raw cement meal from a gas in which the meal is suspended and wherein the separators of the plurality of stages are serially connected and in series with a calcining combustor,
the plurality of stages comprising a top separator arranged at the uppermost stage of the preheater and a plurality of bottom separators arranged at the lowermost stages of the preheater,
the top separator comprising:
a top separator housing comprising a substantially cylindrical top separator upper part and a substantially conical top separator lower part,
a top separator tangential inlet in the top separator upper part of the top separator housing for introducing an un-separated stream of gas and raw cement meal in suspension,
a top separator outlet in a lowermost end of the conical top separator lower part for discharging a first fraction of coarse cement raw meal material,
a top separator central tube extending with a free end axially into the top separator housing for diverting a second fraction of fine cement raw meal material and gas,

the bottom separators comprising:
a bottom separator housing comprising a substantially cylindrical bottom separator upper part and a substantially conical bottom separator lower part,
a bottom separator tangential inlet in the bottom separator upper part of the bottom separator housing for introducing an unseparated stream of gas and raw cement meal in suspension,
a bottom separator outlet in a lowermost end of the conical bottom separator lower part for discharging a first fraction of coarse cement raw meal material,
a bottom separator central tube extending with a free end axially into the bottom separator housing for diverting a second fraction of fine cement raw meal material and gas,

wherein the top separator central tube enters the top separator housing in the lower part of the top separator housing, and
wherein the central tubes of the bottom separators enter the bottom separator housing in the upper part of the bottom separator housing.

2. The preheater of claim 1 , wherein the top separator comprises a top separator suspension having a receiving opening for receiving and supporting the top separator, wherein a receiving opening diameter of the receiving opening is smaller than a top separator upper part diameter of the top separator upper part and wherein the top separator is suspended by the top separator suspension engaging the top separator lower part.

3. The preheater of claim 1 , wherein a ratio between an upper part diameter D CYL of the top separator upper part and a central tube diameter D CT of the top separator central tube is between 1.8<D CYL /D CT <3.

4. The preheater of claim 3 , wherein the upper part diameter of the top separator upper part is larger than a upper part diameter of the bottom separator upper part.

5. The preheater of claim 1 , wherein the top separator comprises a material feed inlet arranged in a central part of the upper part of the top separator housing.

6. The preheater of claim 5 , wherein the material feed inlet is arranged co-axially with a longitudinal center axis of the top separator housing.

7. The preheater of claim 5 , wherein the material feed inlet comprises means for spreading material feed in a tangential direction of the top separator housing directing the material feed in a direction from the material feed inlet towards the periphery of the top separator housing such that the material feed exiting the material inlet has a tangential velocity component in a tangential direction of the top separator housing.

8. The preheater of claim 7 , wherein, the tangential direction is co-current with a direction of airflow in the top separator.

9. The preheater of claim 5 , wherein the material feed inlet comprises means for spreading material feed in a radial direction of the top separator housing directing the material feed in a direction from the material feed inlet towards the periphery of the top separator housing such that the material feed exiting the material inlet has a radial velocity component in a radial direction of the top separator housing.

10. The preheater according to claim 7 , wherein the means for spreading the material feed in the tangential direction comprises an exit tube directed in the tangential direction.

11. The preheater according to claim 7 , wherein the means for spreading the material feed in the tangential direction comprises a splash plate angled in the tangential direction.

12. The preheater according to claim 7 , wherein the means for spreading the material feed in the tangential direction comprises material accelerating means such as pressurized air or mechanical conveyor means.

13. The preheater according to claim 7 , wherein the means for spreading the material feed in the tangential direction comprises a rotating plate for accelerating the material after entry into the top separator.

14. The preheater of claim 13 , wherein the rotating plate comprises one or more substantially vertical shovel blades for forcing the material in the direction of rotation of the rotating plate.

15. The preheater of claim 14 , wherein the shovel blades extend from the center of the rotating plate to the periphery of the rotating plate in a substantially radial direction.

16. The preheater of claim 14 , wherein the shovel blades are gradually decreasing in height from the center of the rotating plate towards the periphery of the rotating plate.

17. The preheater according to claim 9 , wherein the means for spreading the material feed in the radial direction comprises an exit tube directed in the radial direction.

18. The preheater according to claim 9 , wherein the means for spreading the material feed in the radial direction comprises a splash plate angled in the radial direction.

19. The preheater according to claim 9 , wherein the means for spreading the material feed in the radial direction comprises material accelerating means such as pressurized air or mechanical conveyor means.

20. The preheater according to claim 9 , wherein the means for spreading the material feed in the radial direction comprises a rotating plate for accelerating the material after entry into the top separator.

Assignees

• Smidth As F L

Inventors

• Tokman Alexander Flavio
• Pommer Gilla
• Petersen Per Ingemann

Classifications

• F27B15/003

  Cyclones or chain of cyclones · CPC title

• F27B7/2016

  Arrangements of preheating devices for the charge · CPC title

• F27B7/2033 Primary

  with means for precalcining the raw material · CPC title

• F27D2017/009

  Mechanical Engineering · mapped topic

• F27D17/004

  Mechanical Engineering · mapped topic