JPH06159612A - High load combustion device - Google Patents

Abstract

PURPOSE:To prevent Co from being discharged and make possible a substantial restriction of occurrence of nitrogen oxide. CONSTITUTION:A high load combustion device is constructed such that a cold object 2 is mounted near a downstream side of a burner 1, a mixing promotion means 3 is mounted just after the cold object 2, and a not-yet ignited substance combustion region 6 is formed between the mixing promotion means 3 and a heat exchanger 11. Discharging of CO is prevented under an organic connection of the cold object 2, the mixing promotion means 3 and the not-yet ignited substance combustion region 6 and the like and concurrently the occurrence of nitrogen oxide can be substantially restricted. In addition, a stable combustion can be attained by the mixing promotion means 3 and a high load combustion can also be attained through accomplishment of a complete combustion.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high load combustion device.

[0002]

2. Description of the Related Art Conventionally, a heat exchanger is installed immediately after a burner,
A combustion device is disclosed in which, after cooling the flame temperature, combustion is performed by utilizing the heat insulating space of the heat exchanger (for example, Japanese Patent Laid-Open No. 6-58242).
Year 0, No. 78247).

[0003]

In the above-mentioned combustion apparatus, it is a precondition that a uniform air-fuel mixture is supplied to the burner so that the burner can uniformly burn even in terms of surface load.
For example, when the air ratio is distributed, there is a problem that the combustion cannot be completed in the heat insulating space of the heat exchanger and unburned components are discharged. In the burner, it is practically difficult to achieve the above-mentioned preconditions, and it can be said that it is impossible especially in a burner having a large combustion amount, and there is a big problem that a large amount of unburned components are discharged.

[0004]

In order to solve the above-mentioned problems, the present invention is to install a cold object in the immediate vicinity of the burner downstream side,
A mixing promoting means is installed immediately after the cold object, and an unburned component combustion region is formed between the mixing promoting means and the heat exchanger. Further, the present invention is characterized in that the cold object is constituted by a water pipe. Further, the present invention is characterized in that the mixing promoting means is constituted by a rod-shaped body. Further, the present invention is characterized in that the mixing promoting means is constituted by a plate-like member and is installed at the same cross section with a space. Further, the present invention is characterized in that the mixing promoting means is made of foamed ceramics. Further, the present invention is characterized in that the mixing promoting means is constituted by a tubular body, and air ejection holes are formed in the tubular body. Further, the present invention is characterized in that a peripheral wall air ejection hole is provided on the peripheral wall of the unburned component region. Further, the present invention is characterized in that the combustion exhaust gas is ejected from the air ejection hole to configure the unburned component combustion region as a combustion exhaust gas recirculation combustion region.
Further, the present invention is characterized in that the combustion exhaust gas is ejected from the peripheral wall air ejection holes to configure the unburned component combustion region as a combustion exhaust gas recirculation combustion region.

[0005]

[Operation] When combustion starts in the burner, combustion gas (flame)
Is cooled by a cold object immediately downstream of the burner, and is rapidly cooled to 1500 ° C. or lower and 1000 ° C. or higher. This rapid cooling can suppress the generation of nitrogen oxides generated at high temperatures.
Immediately after the rapid cooling, there is a mixing promoting means, and the existence of the combustion gas causes a turbulent flow of the combustion gas to promote mixing. That is, in the case of a rod-shaped body and a tubular body, due to the bluff body effect generated on the downstream side, a strong mixed state is formed, and in the unburned component combustion region located on the downstream side,
Complete the combustion. Then, the heat is absorbed in the heat exchanger on the downstream side and then discharged. At this time, in the case of a tubular body, by injecting air from the air ejection hole, two-stage combustion can be achieved, combustion in the burner can be made a low air ratio combustion, and the generation of nitrogen oxides can be further suppressed. It can be reduced. The air may be ejected not through the air ejection holes of the tubular body but through the peripheral wall air ejection holes provided on the peripheral wall of the unburned component combustion region. Further, when the two-stage combustion is not executed, the combustion exhaust gas is recirculated and ejected from the air ejection hole or the peripheral wall air ejection hole, and low temperature combustion is executed with the unburned component combustion region as the exhaust gas recirculation combustion region. The generation of nitrogen oxides may be suppressed. Further, in the case of a plate-shaped body, since they are installed at intervals in the same cross section, the combustion gas collides with the plate-shaped body and causes a turbulent flow state, which causes mixing like the rod-shaped body and the tubular body. Promote to complete combustion in the unburned component combustion region. Also in the case of the foamed ceramic body, the combustion gas is subdivided through the porosity of the foamed ceramic body, the mixing is promoted, and the combustion is completed as described above.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Reference numeral 1 is a burner, and 2 is a cold object provided immediately downstream of the burner. This cold object is a heat exchanger 1
It is composed of a water pipe communicating with 1. 3 is a mixing promoting means, and this mixing promoting means 3 is arranged in the immediate vicinity of the downstream side of the cold object 2. The mixing promoting means 3 may be a rod-shaped body 4 or a tubular body 5, or a foam ceramic body 10.
But it's okay. In the case of the tubular body 5, the air outlet 7 may be provided in the tubular body 5. Reference numeral 6 is the mixing promoting means 3
And the heat exchanger 11 in the unburned component combustion region, and the peripheral wall air jetting portion 8 is provided on the peripheral wall thereof. Then, when combustion starts in the burner 1, the combustion gas (flame) is cooled by the cold object 2 immediately downstream of the burner 1, and the combustion temperature thereof is rapidly cooled to 1500 ° C. or lower and 1000 ° C. or higher. This rapid cooling can suppress the generation of nitrogen oxides generated at high temperatures. Immediately after the rapid cooling, the mixing promoting means 3 exists, and the existence of the mixing promoting turbulent flow of the combustion gas promotes the mixing. That is, in the case of the rod-shaped body 4 and the tubular body 5, a strong mixed state is formed due to the bluff body effect formed on the downstream side thereof, and the unburned component combustion region 6 located on the downstream side of the mixing promoting means 3. At this point, the combustion is completed. Then, the heat is absorbed in the heat exchanger 11 on the downstream side, and then discharged. At this time, in the case of the tubular body 5, by ejecting air from the air ejection hole 7, two-stage combustion can be achieved, the combustion in the burner 1 can be made a low air ratio combustion, and nitrogen oxide Occurrence can be further reduced. In addition, the jet of air is
Instead of ejecting from the air ejection holes 7 of the tubular body 5, the air may be ejected from the peripheral wall air ejection portion 8 provided on the peripheral wall of the unburned component combustion region 6. Further, when the two-stage combustion is not performed, the combustion exhaust gas is recirculated and ejected from the air ejection hole 7 or the peripheral wall air ejection portion 8, and the unburned component combustion region 6 is used as the exhaust gas recirculation combustion region to perform low temperature combustion. May be performed to suppress the generation of nitrogen oxides. Further, in the case of the plate-shaped body 9, since they are installed at the same cross section with a space therebetween, the combustion gas collides with the plate-shaped body 9 to cause a turbulent flow state, so that the rod-shaped body 4 and tubular body 5 Similarly, the mixing is promoted to complete the combustion in the unburned partial combustion region 6. Also in the case of the foam ceramic body 10, the combustion gas is subdivided through the porosity of the foam ceramic body 10 itself, the mixing is promoted, and the combustion is achieved as described above. The cold object 2 may be formed by a water supply system before being introduced into the heat exchanger 11, and the water pipe of the water supply system may be used as the cold object 2.

[0007]

Since the present invention is as described above, it is possible to achieve complete combustion and prevent the emission of CO, and at the same time, it is effective in low temperature combustion, two-stage combustion, exhaust gas recirculation combustion, etc. Therefore, the generation of nitrogen oxides can be greatly suppressed. Further, due to the remarkable improvement of the mixed combustion, it is possible to achieve excellent effects such that high load combustion can be achieved under the various effects described above.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing an example of the present invention.

FIG. 3 is an explanatory diagram showing an example of the present invention.

FIG. 4 is an explanatory diagram showing an example of the present invention.

FIG. 5 is an explanatory diagram showing an example of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 burner 2 cold object 3 mixing promotion means 4 rod-shaped body 5 tubular body 6 unburned component combustion region 7 air ejection hole 8 peripheral wall air ejection portion 9 plate-shaped body 10 foamed ceramic body 11 heat exchanger

Claims (9)

[Claims] 1. A cold object is installed in the immediate vicinity of the downstream side of the burner,
A high-load combustion apparatus characterized in that a mixing promoting means is installed immediately after the cold object, and an unburned component combustion region is formed between the mixing promoting means and the heat exchanger. 2. The high-load combustion apparatus according to claim 1, wherein the cold object is composed of a water pipe. 3. The high-load combustion apparatus according to claim 1, wherein the mixing promoting means is constituted by a rod-shaped body. 4. The high load combustion apparatus according to claim 1, wherein the mixing promoting means is constituted by a plate-like member, and is installed at intervals in the same cross section. 5. The high-load combustion apparatus according to claim 1, wherein the mixing promoting means is made of foamed ceramics. 6. The high-load combustion apparatus according to claim 1, wherein the mixing promoting means is constituted by a tubular body, and air ejection holes are formed in the tubular body. 7. The high load combustion apparatus according to claim 1, wherein a peripheral wall air ejection hole is provided in the peripheral wall of the unburned component combustion region. 8. The high-load combustion apparatus according to claim 6, wherein the unburned partial combustion region is configured as a flue gas recirculation combustion region by ejecting flue gas from the air ejection holes. 9. The high load combustion apparatus according to claim 7, wherein the unburned component combustion region is configured as a combustion exhaust gas recirculation combustion region by ejecting combustion exhaust gas from the peripheral wall air ejection holes.