Furnace

Patent metadata

Field	Value
Publication number	US-11603607-B2
Application number	US-201816623469-A
Country	US
Kind code	B2
Filing date	Jun 13, 2018
Priority date	Jun 19, 2017
Publication date	Mar 14, 2023
Grant date	Mar 14, 2023

Abstract

A furnace for thermal treatment, in particular for carbonization and/or graphitization, of material, in particular fibers, in particular fibers of oxidized polyacrylonitrile PAN. During the thermal treatment, a pyrolysis gas is released from the material. The furnace includes a housing, a process space, which is located in the interior of the housing and is delimited by a process space housing and through which the material can be fed, a heating system for heating a process space atmosphere prevailing in the process space, and an extraction system for suctioning process space atmosphere laden with pyrolysis gas from the process space. The extraction system has at least one suction device having a suction channel, which is delimited by a channel wall and which is connected to the process space by means of a suction opening. The suction opening is arranged in a region of the process space in which, during operation of the furnace a temperature prevails at which no or only moderate chemical reactions occur between the pyrolysis gas and the process space housing and/or the channel wall.

First claim

What is claimed is:

1. A furnace for thermal treatment of material, wherein a pyrolysis gas is released from the material during the thermal treatment, comprising:
a) a housing;
b) a process space, which is located in an inner space of the housing and which is bounded by a process space housing and through which material can be guided, the process space being located next to or near an inlet opening of the process space housing, the material to be treated passing through and being fed into the process space through the inlet opening;
c) a process space atmosphere which is heated and prevails in the process space;
d) an extraction system, by means of which process space atmosphere loaded with pyrolysis gas can be exhausted from the process space,
wherein
e) the extraction system comprises at least one exhaust device with an exhaust duct which is bounded by a duct wall and which is connected to the process space via an exhaust opening, the exhaust duct extending through the inlet opening and entering the process space adjacent the material to be treated, wherein the material enters adjacent and external to the exhaust duct;
f) the exhaust opening is arranged in a region of the process space in which, during operation of the furnace, a temperature prevails at which no or only moderate chemical reactions occur between the pyrolysis gas and the process space housing and/or the duct wall.

2. The furnace according to claim 1 , wherein during operation of the furnace, a temperature of less than 1000° C. prevails in the region.

3. The furnace according to claim 1 , wherein the exhaust duct is configured such that the position of the exhaust opening can be changed.

4. The furnace according to claim 3 , wherein the exhaust duct comprises a plurality of duct sections which are detachably connected to each other such that the length of the exhaust duct can be adjusted by the number of provided duct sections.

5. The furnace according to claim 1 , wherein the exhaust duct is connected at an end, which is remote from the exhaust opening, to a collecting duct which for its part is connected to a thermal afterburning device.

6. The furnace according to claim 5 , wherein a passage housing of the at least one exhaust device, in which the collecting duct extends at least region-wise, is arranged in front of an inlet passage of the housing.

7. The furnace according to claim 1 , wherein the process space housing is configured as a muffle.

8. The furnace according to claim 1 , wherein the exhaust duct and/or the collecting duct are made of graphite or are lined with graphite.

9. The furnace according to claim 2 , wherein during operation of the furnace, a temperature of less than 900° C. prevails in the region.

10. The furnace according to claim 1 , wherein during operation of the furnace, a temperature of less than 800° C. prevails in the region.

11. The furnace according to claim 7 , wherein the muffle is made of graphite.

Assignees

• Eisenmann Se

Inventors

• Muck Matthias
• Sabelfeld Dimitri

Classifications

• F27D17/20

  Arrangements for treatment or cleaning of waste gases · CPC title

• F27D17/30

  Arrangements for extraction or collection of waste gases; Hoods therefor · CPC title

• D01F9/32 Primary

  Apparatus therefor · CPC title

• F27B9/28

  for treating continuous lengths of work · CPC title

• F27B9/082 Primary

  Muffle furnaces · CPC title