JP2006125692A - Combustion device implementing swirl combustion - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a combustion device capable of reducing generation of CO and soot dust by improving combustion performance in comparison with a conventional one. <P>SOLUTION: In this combustion device provided with a cylindrical wind box 1 and a burner mounted on a central shaft portion of the wind box 1, and implementing combustion by sending combustion air to a burner portion from an air blower through the wind box, the supply of combustion air is adjusted by a damper 4 mounted in an air passage 2 for supplying air from the air blower to the wind box. The air passage 2 is connected in the tangent direction of the wind box to connect a side wall face of the air passage 2 with a cylindrical side wall face of the wind box 1, the damper 4 mounted in the air passage 2 is an eccentric damper having a rotating shaft 5 at a position out of a center of a damper plate, and the damper is mounted in such a state that the damper rotating shaft is positioned near the air passage side wall face opposite to the tangential extension side of the wind box. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a combustion apparatus that performs swirl combustion.

  In the case of a combustion apparatus that performs combustion while pushing the combustion air with a blower, a wind box that rectifies the air from the blower is provided, and the combustion air is supplied to the burner section via the wind box. The amount of combustion air supplied to the burner part is adjusted by providing a damper in the air passage connecting the blower and the wind box and adjusting the opening of the damper. As described in Japanese Utility Model Publication No. 4-5877, the damper includes a damper plate that changes the opening degree of the air passage and a rotating shaft that rotates the damper plate, and rotates the damper plate according to the amount of combustion. This adjusts the combustion air supply.

When combustion is performed, CO and soot are generated, but it is desired to reduce the generation amount of CO and soot. In order to reduce the generation amount of CO and dust in the combustion apparatus, it is necessary to make the supply air amount appropriate and to sufficiently mix the fuel and the combustion air to enhance the combustibility. For this reason, a baffle plate provided with a slit that swirls the air flow at the tip of the burner is installed, and the swirl flow is given to the air supplied to the combustion section to improve the mixing with the fuel and swirl the flame. It is done while burning. However, only the swirl flow using baffles or the like has a limit in improving swirl force, and the combustion performance cannot be further improved.
No. 4-5877

  The problem to be solved by the present invention is to provide a combustion apparatus capable of reducing the generation amount of CO and soot by improving the combustion performance more than before.

  The invention described in claim 1 is provided with a cylindrical wind box and a burner at the central axis portion of the wind box, and combustion air is burned by being sent from the blower to the burner portion via the wind box. A combustion apparatus, wherein a supply amount of combustion air is adjusted by a damper provided in an air supply path for supplying air from a blower to a wind box, wherein a side wall surface of the air supply path is connected to a cylindrical side wall surface of the wind box The wind path is connected in the tangential direction of the wind box so that they are connected, and the damper provided in the wind path is an eccentric damper having a rotation axis at a position off the center of the damper plate, and the damper rotation axis is tangent to the wind box It is a combustion apparatus that performs swirl combustion, characterized in that a damper is installed so as to be close to the air passage side wall surface facing the direction extension side.

  According to a second aspect of the present invention, in the combustion apparatus for performing the swirl combustion, the burner portion is provided with swirling means for swirling the combustion air in the same direction as the swirl direction of the combustion air in the wind box. Features.

  By carrying out the present invention, the swirl force of air in the combustion section is increased and the combustion performance can be improved, so that the generation amount of CO and soot can be reduced.

  An embodiment of the present invention will be described with reference to the drawings. 1 is a partially transparent perspective view of a part of a combustion apparatus embodying the present invention, FIG. 2 is a plan view taken along the line AA of FIG. 1, and FIG. 3 is a baffle plate provided at the front end of the combustion apparatus FIG.

  The combustion apparatus is provided with a cylindrical wind box 1 and a burner (not shown) in the central axis portion of the wind box 1. A combustion cylinder 3 that is concentric with the wind box 1 and extends downward in FIG. 1 is connected to the wind box 1. A baffle plate 6 for dispersing combustion air flowing through the combustion cylinder 3 and supplying the combustion air to the combustion section, a fuel injection nozzle for injecting fuel, and the like are provided at the tip of the combustion cylinder 3.

  The wind box 1 is connected with a blower passage 2 for supplying combustion air from a blower (not shown), and a damper 4 for adjusting the amount of supply of combustion air is provided in the middle of the blower passage 2. . The air passage 2 has a substantially rectangular cross section, and the air passage 2 is arranged in the tangential direction of the wind box 1 so that one side wall surface (the side wall surface on the back side in FIG. 1) is connected to the cylindrical side wall surface of the wind box 1. Connecting. The damper 4 provided in the air passage 2 is an eccentric damper having a rotating shaft 5 on one end side of the damper plate, and the other side wall surface facing the side wall surface of the air passage 2 that contacts the tangentially extending side of the windbox 1 (see FIG. 1, the rotating shaft 5 of the damper 4 is installed near the side wall surface on the near side.

  The damper 4 changes the flow passage area of the air passage 2 by rotating the rotary shaft 5 installed on the base side of the damper plate. When the flow passage area of the air passage 2 is increased, The rotating shaft 5 is rotated so that the tip side of the damper plate moves in the same direction as the air flow. When the damper plate is inclined in the air passage 2, the air sent from the blower (not shown) into the air passage 2 flows along the surface of the damper plate and extends in the tangential direction of the wind box 1. Flows to the opening formed between the side wall surface of the air passage and the tip of the damper plate. Therefore, on the downstream side of the damper 4, a lot of air flows along the air passage side wall surface extending in the tangential direction of the wind box 1, and the air flow flowing along the side wall surface enters the wind box 1. And since it flows along the cylindrical side wall surface of the wind box 1, a turning force is given to the air flow.

  In the case of a damper provided with a rotating shaft 5 at the center of the damper, when the damper is opened, the damper plate closes the center of the air passage 2 and air is supplied from two openings formed between the two side wall surfaces and the damper plate tip. Was supposed to flow. In this case, since the air is divided into a flow flowing along the side wall surface of the air passage that extends in the tangential direction of the wind box 1 and a flow along the other side wall surface, the turning force in the wind box 1 portion does not increase. It was. However, if the damper is eccentric and the air flow is concentrated on the side wall surface of the air passage that extends in the tangential direction of the wind box 1, the flow of the air flow toward the cylindrical side wall surface of the wind box 1 becomes stronger, and the flow along the cylindrical side wall surface Becomes a swirl flow in the wind box 1, and the swirl force is increased.

  The airflow swirling in the wind box 1 eventually enters the combustion cylinder 3 provided in the central portion of the wind box 1 and continues swirling in the combustion cylinder 3. A baffle plate 6 that disperses combustion air supplied to the combustion unit is provided at the tip of the combustion cylinder 3, and a plurality of slits 7 are provided on the baffle plate 6 as means for swirling the air supplied to the combustion unit. Keep it. The position of the inlet side and the outlet side is shifted in the slit 7 of the baffle plate 6 so that the combustion air swirls in the same direction as the direction in which the combustion air swirls in the wind box 1, and swirl in the wind box 1. The flow should continue to the combustion section beyond the baffle plate 6. In addition, a combustion injection nozzle that injects fuel and an ignition device that emits sparks for ignition are installed at the tip of the combustion cylinder 3, and combustion is performed in the combustion air flow blown out from the slit 7 of the baffle plate 6. Is fired on the downstream side of the combustion cylinder 3.

  In the combustion section on the burner tip side, the fuel is injected into the combustion air flow having a strong swirling flow, so that the mixing of the fuel and the combustion air is good. The flame burns while swirling, and the combustibility is improved, so that the generation amount of CO and dust can be reduced.

1 is a partially transparent perspective view of a part of a combustion apparatus embodying the present invention. Plan view by AA cross section of FIG. Partial cross-sectional perspective view of a baffle plate provided at the tip of the combustion device

Explanation of symbols

1 Windbox
2 Air passage
3 Combustion cylinder
4 Damper
5 Rotating shaft
6 Baffle
7 Slit

Claims (2)

  A cylindrical wind box and a burner provided in the central axis of the wind box, and combustion air is burned by sending air from the blower to the burner section through the wind box. The tangential direction of the wind box so that the side wall surface of the air passage is connected to the cylindrical side wall surface of the wind box in a combustion apparatus in which the amount of combustion air supplied is adjusted by a damper provided in the air passage that supplies air to the box The damper provided in the fan passage is an eccentric damper having a rotating shaft at a position off the center of the damper plate, and the damper rotating shaft faces the tangentially extending side of the wind box. A combustion apparatus for performing swirl combustion, characterized by installing a damper so as to be close to 2. The combustion apparatus for performing swirl combustion according to claim 1, wherein swirl means for swirling the combustion air in the same direction as the swirl direction of the combustion air in the wind box is provided in the burner portion. Performing combustion device.

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