Combustion apparatus

Patent metadata

Field	Value
Publication number	US-9777919-B2
Application number	US-201414648253-A
Country	US
Kind code	B2
Filing date	Jan 8, 2014
Priority date	Jan 23, 2013
Publication date	Oct 3, 2017
Grant date	Oct 3, 2017

Abstract

The present invention relates to a combustion apparatus capable of reducing the emission amount of nitrogen oxide and enabling stable combustion in the entire area of a set load. The combustion apparatus includes: a premixing chamber for premixing air and a gas; a blower for supplying a mixed-gas of the air and the gas to a burner; a combustion chamber for burning the mixed-gas by ignition of the burner; a heat exchanger for exchanging heat with water by using combustion heat in the combustion chamber; and an exhaust gas discharge part for discharging the exhaust gas passing through the heat exchanger, wherein the premixing chamber is formed in a Venturi shape having a throat part of which the cross-section area is tapered between an inlet and an outlet through which the air passes, the throat part of the premixing chamber being connected to a gas supply part for supplying a gas for combustion, and to an exhaust gas recirculation tube to which some of the exhaust gas having passed through the heat exchanger is introduced in proportion to differential pressure according to the flow rate of the mixed-gas passing through the throat part.

First claim

The invention claimed is:

1. A combustion apparatus comprising:
a premixing chamber in which air is mixed with a gas;
a blower for supplying the mixed-gas of the air and the gas to a burner;
a combustion chamber in which combustion is performed by ignition of the burner;
a heat exchanger in which water is heat-exchanged with combustion heat of the combustion chamber;
an exhaust gas discharge part from which an exhaust gas passing through the heat exchanger is discharged,
wherein the premixing chamber has a venturi shape having a throat part, which is gradually reduced in section area from an inlet and an outlet of the premixing chamber to a central portion thereof, between the inlet and the outlet through which the air passes, and
a gas supply part supplying a combustion gas and an exhaust gas recirculation tube are connected to the throat part of the premixing chamber so that a portion of the exhaust gas passing through the heat exchanger is introduced in proportion to a differential pressure according to a flow rate of the mixed-gas passing through the throat part,
a mixed-gas adjusting part opening and closing a flow passage of the air and the gas passing through the premixing chamber to adjust a supply flow rate of the mixed-gas.

2. The combustion apparatus of claim 1 , wherein the premixing chamber is divided into two sides, a first passage and a second passage, by a partition member therebetween,
the combustion gas introduced through the gas supply part is supplied to a first gas supply hole connected to the first passage and a second gas supply hole connected to the second passage, and
the exhaust gas recirculation tube is constituted by a first exhaust gas recirculation tube connected to the throat part of the first passage and a second exhaust gas recirculation tube connected to the throat part of the second passage.

3. The combustion apparatus of claim 2 , wherein a flow passage of the air and the gas of the first passage is in an opened state all the time, and
the mixed-gas adjusting part opens and closes a flow passage of the air passing through the second passage and a flow passage of the gas connected to the second passage through the second gas supply hole.

4. The combustion apparatus of claim 3 , wherein the first and second gas supply holes pass through one side surface of the first passage,
a first gas supply passage extending from the first gas supply hole to the partition member across the first passage and a second gas supply passage passing through the partition member from the second gas supply hole across the first passage to communicate with the second passage are defined in the throat part of the first passage,
a first gas jet hole is defined in the first gas supply passage toward an outlet-side of the first passage, and
a second gas connection hole is defined in an end of the second gas supply passage passing through the partition member toward the second passage.

5. The combustion apparatus of claim 4 , wherein the mixed-gas adjusting part comprises:
a first opening/closing member for opening and closing the flow passage of the air passing through the second passage;
a second opening/closing member for opening and closing the second gas connection hole, and
wherein the first and second opening/closing members may be lined to each other and simultaneously opened and closed.

6. The combustion apparatus of claim 5 , wherein the first opening/closing member comprises:
a main body coupled to a rotation shaft of a driving part and transversally disposed on the throat part of the second passage;
blades coupled to an outer surface of the main body to face each other and have a size corresponding to that of an opened transversal section of the throat part of the second passage, and
wherein the second opening/closing member reciprocates in a transversal direction according to rotation of the first opening/closing member.

7. The combustion apparatus of claim 6 , wherein, on the main body of the first opening/closing member, a first tip portion protruding toward the second opening/closing member and a first bottom portion having an oppositely recessed shape with respect to the first tip portion are alternately disposed at an angle of 90° along a circumferential direction,
a first inclined portion having a recessed shape is disposed between the first tip portion and the first bottom portion,
a second tip portion, a second bottom portion, and a second inclined portion each of which has a shape corresponding to that of each of the first tip portion, the first bottom portion, and the first inclined portion are disposed on the main body ( 331 ) of the second opening/closing member, and
the second opening/closing member is elastically supported so that the second opening/closing member is pressed toward the first opening/closing member by an elastic member.

8. The combustion apparatus of claim 7 , wherein a sealing member for maintaining air-tightness when the second gas connection hole is sealed is coupled to the second opening/closing member.

9. The combustion apparatus of claim 7 , wherein, when the first tip portion of the first opening/closing member contacts the second tip portion of the second opening/closing member, the blades of the first opening/closing member are parallelly disposed with respect to a transversal section of the second passage to block the flow of the air of the second passage, and at the same time, the second opening/closing member is closely attached to the second gas connection hole to block the flow of the gas passing through the second gas connection hole, and
when the first tip portion of the first opening/closing member contacts the second bottom portion of the second opening/closing member, and the first bottom portion of the first opening/closing member contacts the second tip portion of the second opening/closing member, the blades of the first opening/closing member are vertically disposed with respect to the transversal section of the second passage to open the second passage, and at the same time, the second opening/closing member is spaced apart from the second gas connection hole to open the second gas connection hole.

10. The combustion apparatus of claim 7 , wherein a guide member accommodating the second opening/closing member and the elastic member therein to guide a reciprocating motion of the second opening/closing member is disposed on the throat part of the second passage, and
a second gas jet hole is defined in the guide member toward an outlet-side of the second passage.

11. The combustion apparatus of claim 10 , wherein protruding pieces for supporting one end of the elastic member are disposed in plurality on an edge of the main body of the second opening/closing member along a circumferential direction, and
a flange part for supporting the other end of the elastic member and that is closely attached on a circumferential surface of the second gas connection hole is disposed in the guide member.

12. The combustion apparatus of claim 11 , wherein a plurality of guide grooves for guiding the plurality of protruding pieces to move in a horizontal direction are defined in an inner surface of the guide member in longitudinal direction.

13. The combustion apparatus of claim 11 , wherein fixing projections and fixing grooves that are fitted and coupled to each other are respectively formed on the flange part of the guide member and the circumferential surface of the second gas connection hole to fix the guide member.

14. A combustion apparatus comprising:
a premixing chamber in which air is mixed with a gas;
a blower for supplying the mixed-gas of th

Assignees

• Kyungdong Navien Co Ltd

Inventors

• Kim Young Mo

Classifications

• G09B23/40 Primary

  for geology · CPC title

• G09B25/08

  of scenic effects, e.g. trees, rocks, water surfaces (for stage purposes A63J1/00) · CPC title

• F23C9/00 Primary

  Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber (fluidised bed combustion apparatus with means for recirculation of particles entrained from the bed F23C10/02; fluidised bed combustion apparatus with devices for removal and partial reintroduction of material from the bed F23C10/26) · CPC title

• G09B19/0061

  Geography · CPC title

• F23N2221/12

  Recycling exhaust gases · CPC title