Shuttle kiln for firing ceramic porous bodies

Patent metadata

Field	Value
Publication number	US-9776922-B2
Application number	US-201314022619-A
Country	US
Kind code	B2
Filing date	Sep 10, 2013
Priority date	Mar 17, 2011
Publication date	Oct 3, 2017
Grant date	Oct 3, 2017

Abstract

The invention provides a shuttle kiln that can fire ceramic porous bodies containing organic binders in a shorter period of time than in conventional methods without occurring breaks due to a temperature difference between the inside and the outside. The shuttle kiln of the invention is suited for firing of ceramic porous bodies containing organic binders. It includes a gas suction path 4 that suctions in-furnace gas and discharges it via an afterburner 5 and a circulation path 7 that suctions the in-furnace gas to the furnace outside to burn organic binder gas and then returns it into the furnace.

First claim

The invention claimed is:

1. A shuttle kiln for firing ceramic porous bodies containing organic binders, the kiln comprising:
a gas suction path that includes at least one gas suction port for suctioning an in-kiln gas outside the kiln and exhausting the in-kiln gas to the atmosphere via an afterburner; and
a circulation path for suctioning the in-kiln gas outside the kiln, burning an organic binder gas contained in the in-kiln gas, and then recirculating the in-kiln gas back into the kiln,
wherein the gas suction path and the circulation path are completely independent of each other,
wherein the ceramic porous bodies are loaded on a carriage that reciprocates between the inside and the outside of the kiln,
wherein the gas suction path and the gas suction port are located at a lower part of the carriage, and
wherein the circulation path includes a catalytic reactor vessel for catalytic combustion of the suctioned in-kiln gas.

2. The shuttle kiln according to claim 1 , wherein the in-kiln gas is suctioned to the circulation path from a side wall of the kiln body.

3. The shuttle kiln according to claim 1 , further comprising a fuel gas supply pipe mounted in the circulation path upstream of the catalytic reactor vessel and used to supply a fuel gas.

4. The shuttle kiln according to claim 1 , wherein the circulation path comprises:
a heating device mounted upstream of the catalytic reactor vessel and used to heat the suctioned in-kiln gas; and
a cooling device mounted downstream of the catalytic reactor vessel and used to lower a temperature of the gas having passed through the catalytic reactor vessel to a predetermined temperature.

5. The shuttle kiln according to claim 3 , wherein the circulation path comprises:
a heating device mounted upstream of the catalytic reactor vessel and used to heat the suctioned in-kiln gas; and
a cooling device mounted downstream of the catalytic reactor vessel and used to lower a temperature of the gas having passed through the catalytic reactor vessel to a predetermined temperature.

Assignees

• Ngk Insulators Ltd

Inventors

• Miyata Jotaro
• Ihara Chikashi
• Yasue Takashi

Classifications

• C04B2235/6586

  Processes characterised by the flow of gas · CPC title

• C04B35/64

  Burning or sintering processes (C04B33/32 takes precedence {; powder metallurgy B22F}) · CPC title

• C04B2235/6562

  Heating rate · CPC title

• F27D7/06

  Forming or maintaining special atmospheres or vacuum within heating chambers (supplying steam, vapour, gases or liquids F27D7/02) · CPC title

• C04B2235/6584

  at an oxygen percentage below that of air · CPC title