Regenerative burner, industrial furnace and method for producing a fired article

Patent metadata

Field	Value
Publication number	US-11920786-B2
Application number	US-201816174671-A
Country	US
Kind code	B2
Filing date	Oct 30, 2018
Priority date	Nov 6, 2017
Publication date	Mar 5, 2024
Grant date	Mar 5, 2024

Abstract

A regenerative burner including: a combustion chamber; a heat exchange chamber; and a communication passage therebetween, the combustion chamber includes a tip of a fuel nozzle and a flame ejection port, and is configured such that fuel introduced from the fuel nozzle into the combustion chamber can be burned in the combustion chamber using combustion air introduced into the combustion chamber through the communication passage to eject flame from the flame ejection port; the fuel nozzle is configured such that fuel burned in the regenerative burner is introduced into the combustion chamber; and the heat exchange chamber comprises a heat accumulator interposed between the communication passage and an air port, and is configured such that combustion air can pass through the heat accumulator and then be introduced into the combustion chamber such that an exhaust gas passes through the heat accumulator and is discharged from the air port.

First claim

What is claimed is:

1. A regenerative burner comprising: a combustion chamber; a heat exchange chamber; and a communication passage between the combustion chamber and the heat exchange chamber,
wherein the combustion chamber comprises a tip of a fuel nozzle and a flame ejection port, and the combustion chamber is configured such that fuel introduced from the fuel nozzle into the combustion chamber can be burned in the combustion chamber using combustion air introduced into the combustion chamber through the communication passage to produce a flame within the combustion chamber before the flame is ejected from the flame ejection port;
wherein the fuel nozzle is configured such that a total amount of fuel burned in the regenerative burner is introduced into the combustion chamber;
wherein the heat exchange chamber comprises: an air port provided on a wall of the heat exchange chamber such that the air port is perpendicular to a port of the communication passage on a combustion chamber side, and a heat accumulator interposed between the communication passage and the air port, and the heat exchange chamber is configured such that combustion air introduced from the air port into the heat exchange chamber can pass through a space filled with the heat accumulator and then be introduced into the combustion chamber through the communication passage, and such that an exhaust gas introduced into the heat exchange chamber through the communication passage can pass through the space filled with the heat accumulator and then be discharged from the air port; and
wherein a port of the communication passage on the combustion chamber side is disposed on a surface of the combustion chamber perpendicular to a surface of the combustion chamber on which the fuel nozzle is disposed.

2. The regenerative burner according to claim 1 , wherein the tip of the fuel nozzle is disposed at a position opposite to the flame ejection port.

3. The regenerative burner according to claim 1 , wherein the regenerative burner is configured such that an exhaust gas from at least one other regenerative burner can be introduced as a part or all of the combustion air through the air port.

4. The regenerative burner according to claim 3 , wherein the air port is in communication with a combustion air fan for supplying the combustion air, and an inlet of the combustion air fan is in communication with an outlet of an exhaust fan for discharging an exhaust gas from the at least one other regenerative burner.

5. An industrial furnace comprising a plurality of regenerative burners according to claim 1 .

6. The industrial furnace according to claim 5 ,
wherein each of the regenerative burners is configured such that an exhaust gas from at least one other regenerative burner can be introduced as a part or all of combustion air through the air port.

7. The industrial furnace according to claim 5 ,
wherein the industrial furnace is a continuous industrial furnace comprising: an inlet; a binder removing zone; a firing zone; a cooling zone; and an outlet in this order, and being configured to fire at least one ceramic formed article containing an organic binder while transporting it from the inlet toward the outlet;
wherein a plurality of regenerative burners according to claim 1 are disposed in the firing zone; and
wherein the industrial furnace comprises at least one return line that can supply an in-furnace gas in the firing zone to the binder removing zone.

8. A method for producing at least one fired article using the industrial furnace according to claim 7 , the method comprising:
removing a binder from at least one ceramic formed article containing an organic binder in the binder removing zone;
firing the ceramic formed article after removing the organic binder in the firing zone; and
cooling the fired ceramic formed article in the cooling zone.

9. The regenerative burner according to claim 1 , wherein the heat exchange chamber comprises an inlet/outlet port configured to facilitate replacement of the heat accumulator.

Assignees

• Ngk Insulators Ltd

Inventors

• Taniguchi Satoshi
• Tokunaga Takeshi

Classifications

• F23L15/02 Primary

  Arrangements of regenerators · CPC title

• F23C5/28

  to obtain flames in opposing directions, e.g. impacting flames · CPC title

• F23D14/66

  Preheating the combustion air or gas · CPC title

• F23C2900/05081

  Disposition of burners relative to each other creating specific heat patterns · CPC title

• Y02E20/34

  Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery · CPC title