JPS6350605B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a combustion device using a fuel spray nozzle.

Conventional configuration and its problems Conventionally, this type of combustion apparatus has the basic configuration shown in FIG. 1, a partial diagram, FIG. 2, and FIG. 4.
A combustion tube 4 having air holes 3 for generating a plurality of swirling airflows in a combustion chamber 2 made up of a combustor body 1.
An auxiliary combustion tube 7 having a recirculation port 5 and a fuel supply port 6 is provided upright on the outer periphery of the combustion tube 4 at a constant interval approximately concentrically, and the auxiliary combustion tube 8
The fuel supply port 6 and the fuel spray nozzle 8 were arranged opposite to each other. Therefore, for the fuel zone B that is injected from the combustion spray nozzle 8 into the mixing chamber 9, the combustion air is directed clockwise (arrow A) from the air hole 3 of the combustion tube 4.
Since the air is injected as a swirling flow, the air flow A and the fuel injection zone B collide in opposite directions, and the fuel supply port 6
A vortex region D is generated around the side surface C of the fuel supply port 6, which is on the upper side of the swirling airflow (arrow A) when viewed from above. Therefore, this vortex region D becomes a strong flame stabilizing source, and during the process from ignition to steady combustion, an abnormal dark red flame E, which should not be generated normally, is formed throughout the process from ignition to steady combustion. This phenomenon causes problems such as the generation of soot, odor, and a large amount of unburned products such as CO during ignition, which causes soot to adhere to the 3rd peripheral wall of the combustion tube and worsens the exhaust gas, leading to steady combustion. This not only impedes the overall clean blue flame combustion effect, but also generates soot and CO, causing combustion disturbances and leading to incomplete combustion, which is a major problem during the transition period and steady state period.

OBJECT OF THE INVENTION The present invention solves the conventional drawbacks, and eliminates incomplete combustion during the transient and steady periods of combustion by extinguishing the abnormal flame generated on one side of the fuel supply port of the auxiliary combustion tube. The purpose of this is to improve combustion characteristics without odor or the like.

Composition of the Invention In order to achieve this object, the present invention provides a single or multiple auxiliary combustion tube on the side surface of the fuel supply port of the auxiliary combustion tube, which corresponds to the upper side of the swirling airflow injected from the air hole of the combustion tube when viewed from the fuel supply port. By drilling the swirl prevention holes, the swirling air flow and the fuel injection zone collide with each other to generate a swirl area, but the swirl effect is canceled by the swirl prevention holes and the swirl area is generated. Be erased.
Therefore, since there is no strong flame stabilizing source, no abnormal flame is formed on the side of the fuel supply port, and incomplete combustion due to abnormal flame can be completely prevented even during the transitional period of ignition or the steady period when steady combustion has been reached. This solution eliminates the drawbacks of the conventional technology.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1, 3, and 5.
This will be explained using figures. 1 is a combustor main body that also serves as a heat exchanger and is made of a double can wall, and constitutes a combustion chamber 2. A protruding air hole 3 is bored approximately in the center of this combustion chamber 2 to generate a plurality of swirling air flows. An auxiliary combustion tube 7 having a recirculation port 5 and a fuel supply port 6 is installed on the outer periphery of the combustion tube 4 approximately concentrically at a constant interval. The fuel injection nozzle 8 is attached to the combustor main body 1 so as to face the fuel supply port 6.
It is located on one side of the bottom. In particular, the auxiliary combustion tube 7
One or more eddy area prevention small holes 9 are bored in one right side surface of the fuel supply port 6, that is, in the side surface C corresponding to the upper side of the swirling air flow A injected from the air hole 3 of the combustion tube 4. There is. B is a fuel injection zone injected from a fuel injection nozzle. 10 is a mixing chamber, 11 is a recirculation path, 12 is a combustion regulating plate having an opening 12' in the center,
13 is an igniter, 14 is a fuel pump, 15 is a primary air cylinder, 16 is a cylindrical body, 17 is a blower case, and 18 is a combustion main flame.

The operation will be explained using an embodiment configured as above. First, the fuel pump 14 injects liquid or gaseous fuel into the mixing chamber 10 through the fuel injection nozzle 8 . On the other hand, combustion air is supplied from the ventilation case 17 into the mixing chamber 10 and the combustion chamber 2 through the plurality of air holes 3 of the combustion tube 4, and some of the air is supplied together with the injected fuel from the primary air cylinder 15 to the mixing chamber 10 and the combustion chamber, respectively. Supplied within 2 days. At this point, when a high-pressure spark is emitted by the igniter 13, the high-temperature heat injects the fuel into the injection zone B.
is ignited and begins initial combustion. This ignition flame is caused by the movement of the fuel injection zone B and the fuel injection port 6 of the auxiliary combustion tube 7.
The air moves into the mixing chamber 10 through the combustion chamber 10, receives the high-speed swirling air flow supplied from the air hole 3 of the combustion cylinder 3, and accelerates combustion, while also depositing the fuel injection zone B that is subsequently injected. Natural and continuous vaporization of the flame is promoted, diffusion and homogeneous mixing is promoted in the mixing chamber 10, and an initial combustion flame (not shown) is formed in the air hole 3 at the bottom of the combustion tube 4. Until then, it will be a yellow flame. In the next moment, the main flame of clean blue flame 18
is formed, leading to complete combustion.

In particular, from ignition to steady combustion as described above, the fourth
The conventional structure shown in the figure does not have a small swirl area prevention hole 9 on the right side C of the fuel supply port 6 of the auxiliary combustion cylinder 7, that is, on the upper side of the air swirling flow when viewed from the fuel supply port 6, so the fuel injection zone B Combustion air A swirls around
collides with each other and induces a vortex region D, which becomes a strong ignition source and forms a pale black abnormal flame F, which continues to occur from ignition during steady combustion, inducing soot, CO, odor, etc. However, in the present invention, as shown in FIG. 5, one or more vortex area prevention small holes 9 are provided on the right side C of the fuel supply port 6 of the auxiliary combustion tube 7, so that the fuel injection zone B Even if the swirling combustion air flow A collides with the swirling combustion air flow A, the swirl region prevention small hole 9 acts as a buffer zone and no pressure rise occurs. The air flow A in the area where the vortex area occurs moves in and out of the auxiliary combustion tube 7 to control and suppress the generation of the vortex area D in a well-balanced manner. However, the vortex area D
It does not trigger when ignited by, and abnormal flame F does not occur at all. Therefore, even if steady combustion continues for a long time from ignition to steady combustion, the balanced and complete combustion will continue smoothly and for a long time, and during this period soot, CO,
The generation of unburned products such as odors due to incomplete combustion is suppressed as much as possible, and complete combustion is achieved.

Effects of the Invention As explained above, with the configuration of the present invention, the side surface of the fuel supply port 6 of the auxiliary combustion tube 7 which is on the upper side of the swirling airflow injected from the air hole 3 of the combustion tube 4 when viewed from the fuel supply port 6 By providing one or more eddy current prevention small holes 9 in C, the swirling air flow and the fuel injection zone do not collide with each other, the eddying action is eliminated, and the eddy area is eliminated. Therefore, since there is no strong flame stabilizing source, no abnormal flame F is formed on the side surface C of the fuel supply port, and incomplete combustion due to the abnormal flame occurs even during the transitional period at the time of ignition or the steady period when steady combustion has been reached. It completely eliminates the drawbacks of the conventional method and achieves complete combustion.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a typical burner, FIG. 2 is a perspective view of a conventional auxiliary combustion tube, FIG. 3 is a perspective view of an auxiliary combustion tube used in a combustion device according to an embodiment of the present invention, and FIG. 4 is a perspective view of a conventional auxiliary combustion tube. A sectional view taken along the line A-A' in Figure 1, and Figure 5 is a cross-sectional view taken along line A-A' in Figure 1.
-A' line sectional view. 2... Combustion chamber, 3... Air hole, 4... Combustion tube,
5...Recirculation port, 6...Combustion supply port, 7...Assistant combustion tube, 9...Swirl area prevention small hole, A...Swirling air flow, C
……side.

Claims (1)

[Claims] 1. A combustion chamber is provided with a combustion tube having a plurality of air holes approximately in the center of the combustion chamber, with an air supply means and an ignition means for the fuel to be sprayed and a swirling flow facing into the combustion chamber, and a mixing chamber and a combustion tube arranged on the outer periphery of the combustion chamber. An auxiliary combustion tube having a plurality of recirculation ports and a fuel supply port is provided to form a circulation path, and a fuel supply port of the auxiliary combustion tube is located on the upper side of the swirling air flow jetted from the air hole when viewed from the fuel supply port. A combustion device with eddy current prevention holes on the side.