Exhaust gas treating device, temperature raising method of catalyst, regeneration method of honeycomb structure, and ash removing method

Patent metadata

Field	Value
Publication number	US-10166500-B2
Application number	US-201615248125-A
Country	US
Kind code	B2
Filing date	Aug 26, 2016
Priority date	Sep 4, 2015
Publication date	Jan 1, 2019
Grant date	Jan 1, 2019

Abstract

An exhaust gas treating device includes a honeycomb structure including an inner honeycomb structure body, an outer honeycomb structure body disposed at a position which surrounds a part of a circumference of the inner honeycomb structure body and is away from the inner inflow end face of the inner honeycomb structure body, and plugging portions arranged in parts of cells; a can member which stores the honeycomb structure and has an inlet and a second outlet for an exhaust gas; and an opening/closing valve to open and close the second outlet of the can member.

First claim

What is claimed is:

1. An exhaust gas treating device comprising:
a honeycomb structure having porous partition walls defining a plurality of cells extending from a first end face which is one end face to a second end face which is the other end face;
a can member which stores the honeycomb structure and has an inlet and an outlet for an exhaust gas; and
an opening/closing valve disposed in the outlet of the can member to open and close the outlet,
wherein the honeycomb structure comprises an inner honeycomb structure body including a honeycomb substrate having porous inner partition walls defining the plurality of cells extending from an inner inflow end face which is the end face on the side of the first end face to an inner outflow end face which is the end face on the side of the second end face and a circumferential wall disposed at a circumference of the honeycomb substrate, an outer honeycomb structure body disposed at a position which surrounds a part of a circumference of the inner honeycomb structure body and is away from the inner inflow end face of the inner honeycomb structure body, the outer honeycomb structure body has porous outer partition walls defining the plurality of cells extending from an outer inflow end face which is the end face on the side of the second end face to an outer outflow end face which is the end face on the side of the first end face, and plugging portions arranged in parts of the cells,
the can member comprises an inflow tube which fits with an end portion of the inner honeycomb structure body on the side of the inner inflow end face and in which the inlet is formed, and a barrel portion which is continuous with the inflow tube,
in the barrel portion, a first outlet of the exhaust gas is formed at a position between the inner inflow end face of the inner honeycomb structure body and the outer outflow end face of the outer honeycomb structure body, and a second outlet of the exhaust gas is formed at a position which faces the second end face of the honeycomb structure, and
the honeycomb structure is stored in the can member in a state of having a clearance which serves as a through channel for the exhaust gas between the second end face and the can member and having a clearance which serves as a through channel for the exhaust gas between the outer outflow end face of the outer honeycomb structure body and the can member.

2. The exhaust gas treating device according to claim 1 ,
which comprises a bypass pipe in which one end portion is coupled with the first outlet of the barrel portion and the other end portion is coupled with a position behind the opening/closing valve in an exhaust pipe coupled with the second outlet of the barrel portion; and a second valve disposed in the bypass pipe.

3. The exhaust gas treating device according to claim 1 ,
wherein the honeycomb structure is disposed so that the outer outflow end face of the outer honeycomb structure body faces downward and so that an extending direction of the cells is parallel to a vertical direction.

4. The exhaust gas treating device according to claim 1 ,
wherein the plugging portions are not arranged in the inner honeycomb structure body or are arranged only in one end portion of the inner honeycomb structure body, and the plugging portions are arranged only in one of end portions of the outer honeycomb structure body or are arranged in both of the end portions.

5. The exhaust gas treating device according to claim 4 ,
wherein the plugging portions are arranged in end portions of the predetermined cells of the cells of the outer honeycomb structure body on the side of the outer inflow end face and end portions of the residual cells of the cells on the side of the outer outflow end face, and the plugging portions are not arranged in the inner honeycomb structure body.

6. The exhaust gas treating device according to claim 4 ,
wherein the plugging portions are arranged in parts of end portions of the inner honeycomb structure body on the side of any one of the inner inflow end face and the inner outflow end face.

7. The exhaust gas treating device according to claim 1 ,
wherein a thickness of the outer partition walls of the outer honeycomb structure body is larger than a thickness of the inner partition walls of the inner honeycomb structure body.

8. The exhaust gas treating device according to claim 1 ,
wherein a cell density of the outer honeycomb structure body is smaller than a cell density of the inner honeycomb structure body.

9. The exhaust gas treating device according to claim 1 ,
wherein the circumferential wall of the inner honeycomb structure body is formed integrally with the inner partition walls of the inner honeycomb structure body.

10. The exhaust gas treating device according to claim 1 ,
wherein in the can member, an outlet for EGR which connects with a route to recirculate the exhaust gas is formed at a position between the inner inflow end face of the inner honeycomb structure body and the outer outflow end face of the outer honeycomb structure body.

11. The exhaust gas treating device according to claim 1 ,
wherein a sound absorbing material is disposed in a clearance between the second end face and the can member.

12. A temperature raising method of a catalyst loaded onto the honeycomb structure of the exhaust gas treating device according to claim 1 ,
which comprises: closing the opening/closing valve of the exhaust gas treating device; and raising a pressure of an exhaust gas in the can member of the exhaust gas treating device to raise a temperature of the exhaust gas, thereby raising a temperature of the catalyst loaded onto the honeycomb structure.

13. A temperature raising method of a catalyst loaded onto the honeycomb structure of the exhaust gas treating device according to claim 1 ,
which comprises: raising, by a supercharger, a pressure of an exhaust gas in the can member of the exhaust gas treating device to raise a temperature of the exhaust gas, thereby raising a temperature of the catalyst loaded onto the honeycomb structure.

14. A regeneration method of a honeycomb structure in a state where soot is deposited in the honeycomb structure of the exhaust gas treating device according to claim 1 ,
which comprises: closing the opening/closing valve of the exhaust gas treating device comprising the honeycomb structure in which the soot is deposited; raising a pressure of an exhaust gas in the can member of the exhaust gas treating device to raise a temperature of the exhaust gas; and burning the soot, thereby regenerating the honeycomb structure.

15. A regeneration method of a honeycomb structure in a state where soot is deposited in the honeycomb structure of the exhaust gas treating device according to claim 1 ,
which comprises: raising, by a supercharger, a pressure of an exhaust gas in the can member of the exhaust gas treating device to raise a temperature of the exhaust gas; and burning the soot, thereby regenerating the honeycomb structure.

16. An ash removing method of removing ash in a honeycomb structure in a state where the ash is deposited in the honeycomb structure of the exhaust gas treating device according to claim 2 ,
which comprises: opening the opening/closing valve while closing the second valve in the exhaust gas treating device, to generate a flow of a fluid toward the outer inflow end face from the outer outflow end face of the outer honeycomb structure body of the honeycomb structure, thereby removing the ash deposited in the outer honeycomb structure body of the honeycomb structure.

Assignees

• Ngk Insulators Ltd

Inventors

• Aoki Takashi

Classifications

• Y02T10/47

  Cross-Sectional Technologies · mapped topic

• F01N2250/02

  filtering and catalytic conversion · CPC title

• B01D46/2459

  of the plugs · CPC title

• F01N13/0097

  the purifying devices are arranged in a single housing · CPC title

• B01D46/0061 Primary

  Operations & Transport · mapped topic