Process and device for cement clinker production

Patent metadata

Field	Value
Publication number	US-2019039949-A1
Application number	US-201816139666-A
Country	US
Kind code	A1
Filing date	Sep 24, 2018
Priority date	Apr 15, 2013
Publication date	Feb 7, 2019
Grant date	—

Abstract

In a process for the production of cement clinker, in which raw meal is preheated in a preheater ( 3 ) using the hot exhaust gases from a clinker kiln, and the preheated raw meal, which is optionally calcined in a calciner ( 4 ), is burned to clinker in the clinker kiln ( 2 ), wherein the preheater ( 3 ) includes at least one string of a plurality of cyclone suspension-type heat exchangers ( 8, 9, 10 ), through which the kiln exhaust gas successively flows and in which the raw meal is preheated in stages, a partial stream of the kiln exhaust gas is diverted such that only a remaining residual stream of the kiln exhaust gas is utilized for preheating the raw meal.

First claim

1 - 11 . (canceled)

12 . A cement clinker production plant for carrying out a process for the production of cement clinker comprising preheating raw meal in a preheater using hot exhaust gases from a clinker kiln, and burning the preheated raw meal, which is optionally calcined in a calciner, to clinker in the clinker kiln, wherein the preheater comprises at least one string of a plurality of cyclone suspension-type heat exchangers, through which the kiln exhaust gas successively flows and in which the raw meal is preheated in stages, wherein a partial stream of the kiln exhaust gas is diverted such that only a remaining residual stream of the kiln exhaust gas is utilized for preheating the raw meal, said cement clinker production plant comprising a clinker kiln having an output-side end, a clinker cooler connected to the output side end, the clinker cooler having a feed-side end, a preheater, and optionally a calciner, connected to the clinker cooler, wherein the preheater comprises at least one string of a plurality of cyclone suspension-type heat exchangers arranged so that the remaining residual kiln exhaust gas is able to successively flow along a flow path through the at least one string of a plurality of cyclone suspension heat exchangers and in which the raw meal is preheated in stages, and a branch duct ( 16 ) for diverting a partial stream of the kiln exhaust gas from the flow path.

13 . A plant according to claim 12 , wherein the branch duct branches off the flow path after the first cyclone suspension-type heat exchanger, viewed in the flow direction of the kiln exhaust gas.

14 . A plant according to claim 13 , wherein the branch duct branches off the flow path between the first and the second cyclone suspension-type heat exchanger, viewed in the flow direction of the kiln exhaust gas.

15 . A plant according to claim 12 , wherein the plant further comprises a control organ ( 18 ) for adjusting the partial stream of the diverted kiln exhaust gas.

16 . A plant according to claim 15 , wherein said control organ is adjusted such that the volume ratio of the diverted partial stream and the remaining residual stream of the kiln exhaust gas amounts to 5:95 to 40:60.

17 . A plant according to claim 12 , wherein the cement production plant includes a flue duct in which the branch duct and the flue duct lead away from the last cyclone suspension-type heat exchanger, viewed in the flow direction of the kiln exhaust gas, are guided to a mixing device.

18 . A plant according to claim 17 , wherein the mixing device comprises a mixing cyclone having a solids discharge for the separated hot meal that is connected to the calciner or a raw meal charging or conveying device.

19 . A plant according to claim 12 , wherein the plant further comprises a thermal utilization unit, and the clinker kiln exhaust gas diverted via the branch duct, and optionally the kiln exhaust gas drawn off the last cyclone suspension-type heat exchanger, viewed in the flow direction of the kiln exhaust gas, are fed to a thermal utilization unit.

20 . A plant according to claim 19 , wherein said thermal utilization unit comprises apparatus for drying raw material and/or for fuel drying, wherein the dried fuel and/or dried raw material are optionally fed to the clinker production process.

21 . A plant according to claim 19 , wherein said thermal utilization unit comprises the generation of steam in a heat recovery boiler.

22 . A plant according to claim 19 , wherein said thermal utilization unit excludes a drying unit for drying wet waste substances containing organic components, whose drier exhaust gases are fed the calciner.

23 . A plant according to claim 16 , herein said control organs are adjustable such that the volume ratio of the diverted partial stream and the remaining residual stream of the kiln exhaust gas amounts to 10:90 to 30:70.

24 . A cement clinker production plant for carrying out a process for the production of cement clinker comprising preheating raw meal in a preheater using hot clinker kiln exhaust gas from a clinker kiln, wherein the preheater comprises at least one string of a plurality of cyclone suspension heat exchangers through which the hot clinker kiln exhaust gas successively flows and in which the raw meal is preheated in stages, and wherein the string of a plurality of cyclone suspension heat exchangers includes a first cyclone suspension heat exchanger and a last cyclone suspension heat exchanger; burning the preheated raw meal, which is optionally calcined in a calciner, to clinker in the clinker kiln; diverting a partial stream of the hot clinker kiln exhaust gas such that a remaining residual stream of the hot clinker kiln exhaust gas is utilized for preheating the raw meal; drawing off hot clinker kiln exhaust gas from the last cyclone suspension heat exchanger in the at least one string of the plurality of cyclone suspension heat exchangers; and mixing the diverted partial stream of the clinker kiln exhaust gas with the clinker kiln exhaust gas drawn off the last cyclone suspension heat exchanger, viewed in the flow direction of the clinker kiln exhaust gas, said cement clinker production plant comprising
a clinker kiln having an output-side end, a clinker cooler connected to the output side end, the clinker cooler having a feed-side end, a preheater, and optionally a calciner, connected to the clinker cooler, wherein the preheater comprises at least one string of a plurality of cyclone suspension-type heat exchangers arranged so that a portion of kiln exhaust gas is able to successively flow along a flow path through the at least one string of a plurality of cyclone suspension heat exchangers and in which the raw meal is preheated in stages, and a branch duct for diverting a partial stream of the kiln exhaust gas from the flow path.

Assignees

• Holcim Technology Ltd

Inventors

• Gasser Urs

Classifications

• C04B7/432 Primary

  Preheating without addition of fuel · CPC title

• C04B7/4407

  Treatment or selection of the fuel therefor, e.g. use of hazardous waste as secondary fuel (fuels in general C10L); Use of particular energy sources, e.g. waste hot gases from other processes · CPC title

• C04B7/44 Primary

  Burning; Melting · CPC title

• F27B7/2016

  Arrangements of preheating devices for the charge · CPC title

• C04B7/475 Primary

  using the waste heat, e.g. of the cooled clinker, in an other way than by simple heat exchange in the cement production line, e.g. for generating steam · CPC title