System and method for thermally treatment of air-dispersible raw material

Patent metadata

Field	Value
Publication number	US-2024116809-A1
Application number	US-202218277032-A
Country	US
Kind code	A1
Filing date	Feb 4, 2022
Priority date	Feb 12, 2021
Publication date	Apr 11, 2024
Grant date	—

Abstract

The present disclosure relates to a method of thermal treatment of air-dispersible raw material, especially cement raw meal and/or mineral products, wherein the raw material is introduced into a conduit through which hot gases flow and is subjected to thermal treatment by the hot gases and/or the radiant heat in the conduit, fuel is at least partly converted in a treatment region, and the heat generated in the treatment region is supplied at least partly to the conduit, and an oxygen-rich gas is introduced into the treatment region, wherein the oxygen content in the hot gas and/or the gas temperature is ascertained and the amount of oxygen introduced into the treatment region is adjusted by open-loop or closed-loop control depending on the temperature ascertained and/or the oxygen content.

First claim

1 - 6 . (canceled)

7 . A method of thermal treatment of air-dispersible raw material comprising:
introducing the raw material is into a conduit through which hot gases flow; subjecting the raw material to thermal treatment by the hot gases and/or the radiant heat in the conduit, wherein the conduit is a riser conduit; converting fuel at least partly in a treatment region; supplying, at least partially, heat generated in the treatment region is to the conduit, wherein the treatment region and the conduit are connected to each other such that the hot gases generated in the treatment region by the at least partial conversion of the fuel flow at least partially into the conduit; introducing an oxygen-rich gas is into the treatment region; ascertaining the oxygen content in the hot gas; adjusting by open-loop control or closed-loop control depending on the oxygen content ascertained the amount of oxygen introduced into the treatment region, wherein the oxygen content ascertained is compared with a target oxygen content value; and increasing the amount of oxygen introduced into the treatment region when the oxygen content ascertained exceeds the target oxygen content value, wherein the target oxygen content value is an oxygen concentration between 0% and 6%.

8 . The method of claim 1 , wherein the flow direction of the hot gas the oxygen content in the hot gas is determined downstream of the treatment region.

9 . The method of claim 1 , wherein the gas temperature is ascertained within the treatment region or the conduit and wherein the amount of oxygen introduced into the treatment region is adjusted by open-loop or closed-loop control depending on the temperature ascertained.

10 . The method of claim 1 , wherein in the amount of oxygen introduced into the treatment region is increased or reduced based on variance of the oxygen content ascertained from the target oxygen value.

11 . The method of claim 10 , wherein in the temperature ascertained is compared with a target temperature value and, in the event of variance of the temperature ascertained from the target temperature value, the amount of oxygen introduced into the treatment region and/or the amount of combustible fuel introduced via a burner is increased or reduced, wherein the target temperature value is a temperature between 750° C. and 1050° C.

12 . The method of claim 1 , further comprising ascertaining a calorific value of the fuel is and adjusting the amount of oxygen and/or fuel introduced into the treatment region by open-loop control or closed-loop control depending on the calorific value ascertained.

Assignees

• thyssenkrupp Polysius GmbH
• Thyssenkrupp Ag

Inventors

• Lemke Jost
• Lampe Karl

Classifications

• F27D2019/0034

  through control of a heating quantity such as fuel, oxidant or intensity of current · CPC title

• F27D21/0014

  Devices for monitoring temperature · CPC title

• F27D2019/0015

  Monitoring the composition of the exhaust gases or of one of its components · CPC title

• F23N5/006

  the detector being sensitive to oxygen · CPC title

• F27B7/2033

  with means for precalcining the raw material · CPC title