JPS62125206A - Burner - Google Patents

Abstract

PURPOSE:To reduce a production amount of NOx in exhaust gas to a low value and to improve safety of exhaust gas on a human body, by a method wherein heat is absorbed from the interior of flame by means of a flame cooling body to reduce the temperature of flame. CONSTITUTION:Fuel and primary air are fed to a burner 2 for ignition cmbustion. Flame is formed in a state to wrap a flame cooling body 11 therewith, and the flame cooling body is brought into wrap contact with the interior of a secondary flame 6 of flame forming a primary flame 5 and the secondary flame 6. The flame cooling body 11 is a heat resistant material consisting of a good thermal conductivity material, e.g., BeO, Al, both ends 12 are extended through an air feed plate 10 and are firmly secured to an inner case 7 wall. Air is sucked through a suction port 17, a part thereof flows as air for combustion to an air-for-combustion feed chamber 9, and forms flame in cooperation with secondary air, fed to a combustion chamber 8 through a secondary air feed plate 10, is it cools primary air through a nozzle and the end parts of the flame cooling body 11. The air feed chamber part wall of the inner case 7 forms a rediating part togetherwith the end parts of the cooling body 11, and, coupled with good thermal conductivity of the cooling body 11, they drive off a combustion heat from the inner side of flame to keep a flame temperature at a low value.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to improvements in combustors for gas and petroleum fuels, and is aimed at making exhaust gas cleaner.

BACKGROUND OF THE INVENTION Recently, efforts have been made to reduce NOx to make exhaust gas cleaner. One way to do this is to lower the flame temperature, and a surface combustion type burner has been proposed as a specific means. Although this can achieve low No. 1 production, there are limited uses as there is little need to adjust the firepower, making it light.

Problems to be Solved by the Invention The present invention is intended to solve such problems, and aims to maintain the thermal power adjustment as before and to lower the amount of NO in the exhaust gas.

Means for Solving the Problems In order to solve the above-mentioned problems, the combustor of the present invention has a heat resistant material with high thermal conductivity inserted into the flame, and the ends thereof are formed as heat radiating parts.

Function: With the above-described configuration, the flame is cooled from the inside and the flame temperature is lowered. Furthermore, by forming the heat dissipation end, the cooling is always stable, resulting in a high NOx reduction.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. 1st
Is the diagram the combustor of the present invention? FIG. 2 is a side sectional view showing the principle of the indoor open-air heater used, and FIG. 2 is a front sectional view of the combustor shown in FIG. 1.

1 is the outer cake of the hot air heater, 2 is a burner with a Bunsen-like flame formed in the width direction of the heater, and a mixing tube 3 and a nozzle 4 form a flame 5 and a flame 6.

Reference numeral 7 denotes an inner case of the heater, which is divided into a combustion chamber 8 in the north and a combustion air supply chamber 9 in the lower part, separated by a secondary air supply plate 10, with the burner 2 as a boundary.

11 is BedSAg which forms the flame cooling body which is the aim of this application.
A heat-resistant material made of a material with good thermal conductivity such as N, SiC, etc.
In this example, it is formed into a round rod shape, is enclosed in the flame, and has both ends 1.
2 passes through the secondary air supply plate 10 and is tightly fixed to the wall of the inner case 77. Reference numeral 13 denotes a secondary air hole bored in the secondary air supply plate 10, which connects the combustion chamber 8 and the combustion air supply chamber 9.
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Reference numeral 14 denotes a catalyst body supporting an oxidation catalyst, which is provided at the exhaust port 15 at the sun outlet of the combustion chamber. 16 is the blower, 6D, suction port 1
The room air sucked through the air outlet 7 is mixed with exhaust gas discharged from the exhaust port 15, and is blown into the room through the hot air passage 18 and the air outlet 19.

In this configuration, fuel and primary air are supplied to the burner 2 and ignited and burned. At this time, the flame is formed surrounding the flame cooling body 11. In this example, the flame is included in the two flames 6 of which the primary flame 5 and the secondary flame 6 are formed. However, this flame cooling body 11 is made of a material with good thermal conductivity, and its end portion 12 is closely fixed to the inner case 7 in the combustion air supply chamber 9. That is, the heat of the flame is transmitted from the inside to the flame cooling body 112a'' and is transferred to the inner case 7.
heat is radiated to lower the flame temperature. Generally the flame temperature is 2
It is before and after 0oO℃, and when a heated object is inserted into the flame, the temperature of the heated object locally decreases before ignition and after ignition, but the flame temperature only slightly decreases, but in this application, it is a good thermal conductor. In order to constantly extract heat, the flame temperature decreases, and according to experiments, under certain conditions, the flame cooling body temperature is below 600℃ and the humidity inside the flame is below 1000℃.No, the value is 1/3.
It decreased to ~115. (However, the flame surface becomes the front shoulder at 1500 degrees.) The air is sucked through the suction port 17, and a part of it enters the combustion air supply chamber 9 as combustion air, and the primary air from the nozzle and the end of the flame cooling body 11 are While cooling, the secondary air is supplied to the combustion chamber 8 through the secondary air supply plate 10 and forms a flame. The exhaust gas generated in the combustion chamber oxidizes a small amount of unburned matter remaining in the catalyst body, mixes with the air from the suction port 17, and is heated as hot air through the hot air passage 18 to the outlet 19 and into the chamber. released.

At this time, the wall of the air supply chamber of the inner case 77 to which the end of the flame cooling body 11 is fixed must be below 200°C, and together with the end of the flame cooling body 11 constitutes a heat dissipation part, and has good heat conduction of the cooling body 11. Combined with the heat of the flame, it also absorbs the combustion heat from the inside of the flame and keeps the flame temperature low. On the other hand, since the cooling body 11 is inserted into the flame, the combustion is completed without interfering with the formation of the flame.
There is almost no occurrence of o. Furthermore, it is possible to maintain a range close to that of the conventional method even during flame adjustment depending on the length of the flame. In addition, the cooling body end 1
2 may be placed in the hot air passage 18.

Effects of the Invention As described above, the combustor of the present invention makes it possible to suppress the generation of N01c in the exhaust gas by lowering the flame temperature by absorbing heat from the inside of the flame using the flame cooling body. While maintaining ease of use, the safety of exhaust gas to the human body has been greatly improved.

[Brief explanation of drawings]

FIG. 1 is a front cross-sectional view of a combustor according to an embodiment of the present invention used in a hot-air heater, and FIG. 2 is a side cross-sectional view of the same. 2... Burner, 5... Flame (primary flame)
, 6... Flame (secondary flame), 7... Inner case, 11... Heat resistant material (flame cooling body), 12...
...End of heat-resistant material (flame cooling body). Name of agent: Patent attorney Toshio Nakao and 1 other person2-
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Claims (2)

[Claims] (1) A combustor in which a heat-resistant material with good thermal conductivity is inserted into the flame, and the end thereof is formed as a heat radiating part. (2) The combustor according to claim 1, wherein the end portion is in close contact with the inner case wall to radiate heat.