Heating furnace

Patent metadata

Field	Value
Publication number	US-2024003627-A1
Application number	US-202318331256-A
Country	US
Kind code	A1
Filing date	Jun 8, 2023
Priority date	Jun 29, 2022
Publication date	Jan 4, 2024
Grant date	—

Abstract

A heating furnace includes a plurality of heat storage coolers capable of introducing a cooling gas into an inside of the furnace and sucking an in-furnace gas; wherein each of the plurality of heat storage coolers includes a gas nozzle in communication with the inside of the furnace; a gas port in communication with an outside of the furnace and connected to a gas piping system that is capable of switching between supplying gas to the heat storage cooler and exhausting gas from the heat storage cooler; a gas passage communicating the gas nozzle with the gas port and having a space for filling a heat storage element; and a heat storage element filled in the space for filling the heat storage element.

First claim

1 . A heating furnace, comprising a plurality of heat storage coolers capable of introducing a cooling gas into an inside of the furnace and sucking an in-furnace gas;
wherein each of the plurality of heat storage coolers comprises a gas nozzle in communication with the inside of the furnace; a gas port in communication with an outside of the furnace and connected to a gas piping system that is capable of switching between supplying gas to the heat storage cooler and exhausting gas from the heat storage cooler; a gas passage communicating the gas nozzle with the gas port and having a space for filling a heat storage element; and a heat storage element filled in the space for filling the heat storage element.

2 . The heating furnace according to claim 1 , wherein the heating furnace is a continuous heating furnace comprising an inlet, a heating zone, a cooling zone, and an outlet in this order, for heat treating at least one workpiece while transporting the at least one workpiece from the inlet to the outlet in the furnace, and
the cooling zone comprises the plurality of heat storage coolers.

3 . The heating furnace according to claim 1 , wherein at least one heat storage cooler of the plurality of heat storage coolers comprises at least one inlet/outlet for exchanging the heat storage element.

4 . The heating furnace according to claim 3 , wherein at least one heat storage cooler of the plurality of heat storage coolers comprises:
the gas passage comprising a first gas passage extending horizontally from the gas nozzle, and a second gas passage communicating the space for filling the heat storage element located below the first gas passage with the first gas passage; a first inlet/outlet for exchanging the heat storage element provided above the second gas passage; and a communication passage communicating the first inlet/outlet with the second gas passage.

5 . The heating furnace according to claim 3 , wherein at least one heat storage cooler of the plurality of heat storage coolers comprises a second inlet/outlet for exchanging the heat storage element, in communication with a lower portion of the space for filling the heat storage element.

6 . The heating furnace according to claim 1 , wherein the heat storage element is in a form of balls, honeycombs or meshes.

7 . The heating furnace according to claim 1 , wherein at least one of the plurality of heat storage coolers comprises the gas nozzle on a first inner wall, and at least one of the plurality of heat storage coolers comprises the gas nozzle on a second inner wall facing the first inner wall.

8 . The heating furnace according to claim 7 , satisfying one or both of the following conditions (1) and (2):
(1) at least one of the plurality of heat storage coolers comprises the gas nozzle at above half a height of the first inner wall, and at least one of the plurality of heat storage coolers comprises the gas nozzle at below half a height of the second inner wall, (2) at least one of the plurality of heat storage coolers comprises the gas nozzle at above half the height of the second inner wall, and at least one of the plurality of heat storage coolers comprises the gas nozzle at below half the height of the first inner wall.

9 . The heating furnace according to claim 7 , wherein a number of the heat storage coolers comprising the gas nozzle on the first inner wall and a number of the heat storage coolers comprising the gas nozzle on the second inner wall are the same.

10 . The heating furnace according to claim 7 , wherein at least one heat storage cooler comprising the gas nozzle on the first inner wall and at least one heat storage cooler comprising the gas nozzle on the second inner wall are configured to be contrary regarding a timing of introducing the cooling gas into the furnace and a timing of sucking the in-furnace gas.

11 . The heating furnace according to claim 2 , wherein the cooling zone comprises one or more cooling gas supply ports capable of introducing the cooling gas into the furnace on a side even closer to the outlet than the heat storage cooler closest to the outlet among the plurality of heat storage coolers; each of the one or more cooling gas supply ports is in communication with the gas port of at least one of the plurality of heat storage coolers, and is configured such that an exhaust gas from the at least one heat storage cooler can be introduced into the furnace via the cooling gas supply port as the cooling gas.

12 . The heating furnace according to claim 11 , wherein the cooling zone comprises one or more out-of-furnace air inlets in communication with the outside of the furnace on a side even closer to the outlet than the cooling gas supply port closest to the outlet among the one or more cooling gas supply ports.

13 . The heating furnace according to claim 1 , wherein the heating furnace is a firing furnace.

Assignees

• Ngk Insulators Ltd

Inventors

• Kitaguchi Daniel Yukichi
• Kinoshita Tatsuya
• Sato Masami

Classifications

• F27B9/12 Primary

  with special arrangements for preheating or cooling the charge · CPC title

• F27D9/00 Primary

  Cooling of furnaces or of charges therein (casings, linings, walls or roofs incorporating cooling arrangements F27D1/12) · CPC title

• F28C3/005

  one heat-exchange medium being a solid (F28C3/10 takes precedence) · CPC title

• F27B2009/126

  involving the circulation of cooling gases, e.g. air · CPC title

• F27D2009/0075

  in direct contact with the charge · CPC title