System having a furnace and method for operating such a system

Patent metadata

Field	Value
Publication number	US-11034616-B2
Application number	US-201716082336-A
Country	US
Kind code	B2
Filing date	Mar 3, 2017
Priority date	Mar 7, 2016
Publication date	Jun 15, 2021
Grant date	Jun 15, 2021

Abstract

A method of operating a plant having a furnace including at least two vertical shafts connected by an overflow duct, wherein at least one burner is arranged above the overflow duct in each case such that the burner gases therefrom flow downward in burning operation of the respective shaft. A cooling gas supply is provided beneath the overflow duct in each case such that, in combination with the operation of a burner in the burner-operated shaft, the burner gas flowing downward is deflected in the direction of the overflow duct by the cooling gas ascending in the burner-operated shaft, and a supply of cooling gas is adjusted such that the temperature of the burner charge through which the burner gas flows at least in the burner-operated shaft is kept above the deacidification temperature thereof.

First claim

What is claimed is:

1. A method of operating a plant having a furnace comprising:
two vertical shafts,
an overflow duct connecting the two vertical shafts,
a burner disposed in each of the two vertical shafts above the overflow duct and configured such that burner gas therefrom flows downward in burning operation of each of the two vertical shafts, and
a cooling gas supply disposed in each of the two vertical shafts beneath the overflow duct and configured such that, in combination with the operation of the burner in a burner-operated shaft of the two vertical shafts, the burner gas flowing downward is deflected in the direction of the overflow duct by ascending cooling gas from the cooling gas supply,
the method comprising:
adjusting a supply of the cooling gas such that the temperature of burner charge through which the burner gas flows in the burner-operated shaft of the two vertical shafts is kept above the deacidification temperature thereof; and
removing the burner charge from the two vertical shafts while the burner charge is at least 200° C.

2. The method of claim 1 , wherein the temperature of the burner charge through which the burner gas flows is kept above 800° C.

3. The method of claim 1 , further comprising discharging the burner charge from the two vertical shafts and transferring the discharged burner charge into an aftercooler.

4. The method of claim 3 , comprising cooling the burner charge in the two vertical shafts by means of the cooling gas to a temperature of not less than 200° C. and/or cooling the burner charge in the aftercooler down to a temperature of not more than 100° C.

5. The method of claim 3 , comprising cooling the burner charge in the two vertical shafts by means of the cooling gas to a temperature between 200° C. and 400° C. and/or cooling the burner charge in the aftercooler down to a temperature of not more than 100° C.

6. A plant comprising:
a furnace including two vertical shafts,
an overflow duct connecting the two vertical shafts,
a burner disposed above the overflow duct and such that burner gas therefrom flows downward in burning operation of each of the two vertical shafts,
a cooling gas supply disposed beneath the overflow duct and in each of the two vertical shafts such that, in combination with the operation of the burner in a burner-operated shaft of the two vertical shafts, the burner gas flowing downward is deflected in the direction of the overflow duct by ascending cooling gas from the cooling gas supply, and
a control device that is configured to provide for a state of operation for the furnace in which the cooling gas supply is controlled such that the temperature of a burner charge through which the burner gas flows in the burner-operated shaft of the two vertical shafts is kept above the deacidification temperature thereof and such that the burner charge is at least 200° C. upon removal from the two vertical shafts.

7. The plant of claim 6 , wherein the control device is configured to provide for a state of operation for the furnace in which the temperature of the burner charge through which the burner gas flows at least in the two vertical shafts is kept above 800° C.

8. The plant of claim 6 , wherein the control device is configured to provide for a state of operation for the furnace in which the burner charge is cooled in the two vertical shafts by means of the cooling gas to a temperature of not less than 200° C.

9. The plant of claim 6 , wherein the control device is configured to provide for a state of operation for the furnace in which the burner charge is cooled in the two vertical shafts by means of the cooling gas to a temperature between 200° C. and 400° C.

10. The plant of claim 6 , further comprising an aftercooler for the burner charge connected downstream of the furnace.

11. The plant of claim 9 , wherein the control device is configured to provide for a state of operation for the aftercooler in which the burner charge is cooled in the aftercooler until attainment of a temperature of not more than 100° C.

12. The plant of claim 9 , further comprising one or more connecting lines that connect an offgas outlet of the aftercooler to a burner gas supply to the two vertical shafts in each case and/or to a fuel supply for the burners of the two vertical shafts and/or to a device for conversion of thermal energy from offgas from the aftercooler to mechanical energy and/or electrical power.

Assignees

• Maerz Ofenbau
• Thyssenkrupp Ag

Inventors

• Piringer Hannes
• Bucher Patrick

Classifications

• F27B1/24

  Cooling arrangements · CPC title

• F27B1/02

  with two or more shafts or chambers, e.g. multi-storey · CPC title

• F27D19/00

  Arrangements of controlling devices · CPC title

• F27B1/28

  Arrangements of monitoring devices, of indicators, of alarm devices · CPC title

• F27B1/26

  Arrangements of controlling devices · CPC title