IP Library › Granted Patent US 12,643,816
Granted Patent B2
US 12,643,816 · App. 17/916,966 · Granted Jun 2, 2026

Method and device for the production of cement clinker

Inventors: Thomas Lappe (Bergkamen, DE); Eike Willms (Dortmund, DE)
Assignees: thyssenkrupp Polysius GmbH; VICAT SA; DYCKERHOFF GMBH
C04B7/47C04B7/434C04B7/4415
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Quick Facts
Patent No.
US 12,643,816
App. No.
17/916,966
Granted
Jun 2, 2026
Kind
B2
Abstract

A process for producing cement clinker may involve preheating raw meal in a preheater, calcining the preheated raw meal in a calciner, burning the preheated and calcined raw meal in a furnace to give cement clinker, cooling the cement clinker in a cooler, branching off a portion of the furnace offgases flowing out of the furnace as bypass gas, cooling the bypass gas in a mixing chamber with a cooling gas, and separating out dust present in the bypass gas. The cooling gas is formed at least partly or completely from the bypass gas and/or the calciner offgas and/or the preheater offgas. The cooling gas is introduced into the mixing chamber in a ratio of 2-10:1 relative to the bypass gas.

Claims (14)

1 . A process for producing cement clinker, the process comprising:

preheating raw meal in a preheater;

calcining in a calciner the raw meal that has been preheated;

burning in a furnace the raw meal that has been preheated and calcined to give cement clinker;

cooling the cement clinker in a cooler;

branching off a portion of furnace offgases flowing out of the furnace as bypass gas; and

cooling the bypass gas in a mixing chamber with a cooling gas and separating out dust present in the bypass gas, wherein the cooling gas is formed at least partly or completely from at least one of the bypass gas, a calciner offgas, or a preheater offgas,

wherein the cooling gas is introduced into the mixing chamber in a ratio of 2-10:1 relative to the bypass gas;

wherein the cooling gas is formed partly or completely from a portion of the bypass gas that has been dedusted and cooled without passing back through the preheater, calciner, or furnace, wherein a portion of the bypass gas that is not fed to the mixing chamber is fed to at least one of the calciner, the furnace, or the cooler.

2 . The process of claim 1 wherein the bypass gas is branched off between the furnace and the calciner.

3 . The process of claim 1 wherein the bypass gas is branched off downstream of the calciner.

4 . The process of claim 1 wherein the cooling gas is cooled in a second cooler prior to entry into the mixing chamber.

5 . The process of claim 4 wherein the second cooler that is upstream of the mixing chamber is an evaporative cooler or a gas-gas heat exchanger.

6 . The process of claim 1 wherein at least a portion of the bypass gas that is cooled and dedusted is fed to at least one of the calciner, the furnace, or the cooler.

Assignments (3)
CHANGE OF NAME Recorded Nov 5, 2024
From: THYSSENKRUPP INDUSTRIAL SOLUTIONS AG
To: THYSSENKRUPP POLYSIUS GMBH
Reel/Frame 069148/0739 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Oct 10, 2023
From: LAPPE, THOMAS; WILLMS, EIKE
To: VICAT SA; DYCKERHOFF GMBH
Reel/Frame 065168/0757 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Oct 4, 2022
From: LAPPE, THOMAS; WILLMS, EIKE
To: THYSSENKRUPP INDUSTRIAL SOLUTIONS AG
Reel/Frame 061309/0141 →
Priority Claims (2)
BE 2020/5226 · Apr 8, 2020 · national
DE 10 2020 204 519.4 · Apr 8, 2020 · national
Continuity (1)
Related Publication 20230150871A1 · May 18, 2023
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