JPS6020016A - Combustion device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION As shown in FIG. 1 and a partial view, FIG. 2, and FIG. The drilled combustion tube 4 is completely erected, and an auxiliary combustion tube 7 having a recirculation port 5 and a fuel supply port 6 is erected approximately concentrically on the outer periphery of the combustion tube 4 at a constant interval. The fuel supply port 6 of the cylinder 8 and the fuel spray nozzle 8 were arranged opposite to each other. Therefore, the combustion air is injected as a swirling flow from the air hole 3 of the combustion tube 4 clockwise (arrow A) to the fuel zone B injected from the combustion spray nozzle 8 into the mixing chamber 9. The flow A and the fuel injection zone B collide in opposite directions, and a vortex area is formed around the side surface C of the fuel supply hole 6, which is on the right side of the swirling air flow (arrow A) when viewed from the fuel supply port 6. occurs. Therefore, this vortex area becomes a strong flame stabilizing source, and during the process from ignition to steady combustion, an abnormal flame E of pale black red flame that is not normally generated is formed throughout the process from ignition to steady combustion. This phenomenon is caused by the generation of soot, odor, and large amounts of unburned products such as CO at the time of ignition.
Soot on the 3rd circumferential wall of the combustion tube [This is a problem due to the deterioration of exhaust gas, including the build-up of soot, and when it comes to steady combustion, it obstructs the overall clean blue flame combustion action, and also causes soot and CO to be generated, as well as combustion. By extinguishing the abnormal flame that occurs on the fuel supply low side of the large cylinder during the transition and steady periods, the incomplete combustion in the transition and steady phases of combustion can be eliminated.CQ , one or more eddy current prevention small holes are drilled on the side of the fuel supply port of the auxiliary combustion tube, which is on the upper side of the swirling airflow injected from the air hole of the combustion tube, when viewed from the side, to achieve combustion characteristics without odor etc. As a result, the swirling airflow and the fuel injection zone collide with each other, creating a vortex area.
The small eddy current prevention holes described in vIJ eliminate the d and ``h flow effects and eliminate the eddy area.

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 at the time of ignition or the steady period when steady combustion has been reached. Has it been resolved and the situation is no longer redundant? This will be explained using Section 1, Figure 3, and Figure F5. 1 is a combustor main body which also serves as a heat exchanger and has a double can wall, which constitutes a combustion chamber 2, and approximately in the center of this combustion chamber 2 is a protruding air hole 3 which produces a plurality of swirling air flows. A perforated combustion tube 4 is erected, and an auxiliary combustion tube 7 having a recirculation port 5 and a fuel supply port 6 is erected approximately concentrically on the outer periphery of the combustion tube 4 at a constant interval. A fuel injection nostle 8 is arranged on one side of the combustor main body 1F so as to face the mJ fuel supply port 6.

In particular, one or more vortex area prevention small parts are installed on the right side of the fuel supply port 6 of the auxiliary combustion tube 7, that is, on the side surface C that corresponds to the L side of the swirling air flow A injected from the air hole 3 of the combustion tube 4. Hole 9
is installed. B is the fuel injection zone where the fuel is injected from the fuel injection nozzle. 10 is a mixing chamber, 11 is a recirculation path, 12 is an opening 12' in the center, 'f: a combustion regulating plate having a flame, 13 is an igniter, 14 is a fuel bonder, 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 shown below. 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, the air for combustion from the ventilation case 17 is supplied into the mixing chamber 10 and the combustion chamber 2 through the plurality of air holes 3 of the combustion cylinder 4, and some of the air is supplied to the primary air cylinder 1.
5 and 5 are respectively supplied into the mixing chamber 10 and the combustion chamber 2 together with the injection fuel control. At this point, when the igniter 13 emits, for example, a high-pressure spark, the injected fuel injection zone B is ignited by the high-temperature heat, and initial combustion begins. This ignition flame moves into the mixing chamber 10 through the fuel injection port 6 of the auxiliary combustion tube 7 as the fuel injection zone B moves, and receives the air of the high-speed swirling airflow supplied from the air hole 3 of the combustion tube 3. While promoting combustion, the naturally and continuously vaporization of the subsequently injected Bi ignition flame in the fuel injection zone is promoted, and diffused homogeneous mixing is achieved within the mixing chamber 10. As a result, an initial combustion flame (not shown) is formed in the air hole 3 of the F section of the cylinder 4, and up to this point, the flame is yellow.

In the next instant, a clean main combustion flame 18 of blue flame is formed, leading to complete combustion.

Particularly, from ignition to steady combustion as indicated by nIJ, as shown in Figure 4, conventionally, the vortex region prevention small Because it did not have a hole 9, the fuel injection zone B collided with the swirling combustion air A, inducing a vortex region, which became a strong ignition source and formed a pale black abnormal flame F. , from ignition to continuous combustion during steady combustion, producing soot and CO1
However, as shown in FIG. 5, the present invention provides one or more vortex area prevention small holes 9 on the right side C of the fuel supply port 6 of the auxiliary combustion tube 7. Because of this provision, even if the fuel injection zone B collides with the swirling combustion air current A, the eddy region prevention small hole 9 acts as a buffer zone and the air pressure does not rise at all. 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 eddy area in a well-balanced manner. However, when ignition occurs due to the swirl flow, no abnormal flame F is generated.

Therefore, even if steady combustion continues for a long time from ignition to steady combustion, a balanced and complete combustion will continue smoothly throughout this period and continue for a long time.
During this period, the generation of unburned products such as soot and CO1 odor that harm incomplete combustion is minimized as much as possible when viewed from the air supply port 6 through the air hole 3 of the combustion tube 4.
By drilling one or more eddy current prevention small holes 9 in the side surface C of the fuel supply 1''6 of the auxiliary combustion tube 7, which is on the upper side of the swirling airflow injected from the swirling airflow, the swirling airflow and the fuel injection zone can be separated. There is no collision, the eddy current action is resolved, and the eddy area is erased. Therefore, since there is no strong flame stabilizing source, incomplete combustion due to abnormal flame can be completely prevented even in the transition period at the time of ignition or in the steady period when steady combustion is reached without any abnormal flame F being formed at the side part CK of the fuel supply port. This technology 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. FIG. 1 is a sectional view taken along line A--A' in FIG. 1, and FIG. 5 is a sectional view taken along line 8--1' in FIG. 2... Combustion chamber, 3... Air hole, 4...
... Combustion cylinder, 5 ... Recirculation port, 6 ...
...Combustion supply port, 7...Auxiliary combustion tube, 9...
・Swirl flow prevention small hole, A...Swirling air flow, C...
・Name of the lateral agent Patent attorney Toshio Nakao and 1 other person・Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] A combustion cylinder having a plurality of air holes is provided approximately in the center of the combustion chamber, and a mixing chamber and recirculation are provided on the outer periphery of the combustion chamber, with air supply means and ignition means for atomized fuel and swirling flow facing into the combustion chamber. An auxiliary combustion tube having a plurality of recirculation ports and a fuel supply port is provided so as to form a passage, and a side surface of the 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. Combustion device with eddy current prevention holes.