JP2004093086A - Single end type combustion burner of heating furnace - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a single end type radiant tube burner for a heating furnace with heat efficiency higher than a conventional one, and especially heighten an entire effective radiant heating efficiency of a burner by reducing loss heat of exhaust gas from a flue exhaust port of the burner. <P>SOLUTION: A flue exhaust port extends upwardly in an upright manner, and an inlet of combustion air extends upwardly in an upright manner to surround the flue exhaust port extending in an upright manner from the outside, so as to heighten heat exchange exhaust gas passing through the flue exhaust port to the combustion air. Then, the combustion air is sufficiently preheated. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to a single-end combustion burner for heating an atmosphere in an industrial heating furnace. That is, the present invention intends to provide a single-end type combustion burner having high thermal efficiency that recovers waste heat from a burner and uses the recovered heat to preheat combustion air sent to the burner.
[0002]
[Prior art]
When non-electric fuel is used as the heat source for heating the furnace atmosphere of an industrial heating furnace, single-ended radiant combustion tube burners of the type illustrated in FIG. 1 have been commonly used.
[0003]
As shown in FIG. 1, such a radiant tube burner has one end 3 attached to a heat-insulating furnace wall 2 of a heating furnace and closed, and the other end 4 of the radiant tube burner is located outside of the other heat-insulating furnace wall 2 opposed thereto. It has an outer pipe 1 connected to a flue exhaust port 5. Inside the outer tube 1, there is an inner tube 6 whose tip 7 opens toward the closed end 3 of the outer tube and the other end 8 of which is connected to a combustion air inlet 9 outside the other insulated furnace wall 2. Is provided. Further, inside the inner pipe 6, a combustion pipe 10 is provided in which a fuel injection port 11 at a front end faces the front opening 7 of the inner pipe 6 and another end 12 is connected to a combustion gas inlet 13.
[0004]
In the radiant tube burner having the above-described structure, the combustion gas injected into the inner tube 6 from the fuel injection port 11 at the tip of the combustion tube 10 violently together with the air supplied from the combustion air inlet 9 into the inner tube 6. It burns and proceeds toward the closed end of the outer tube 1 as indicated by the arrow in the figure, and then reverses and proceeds through the outer tube 1. That is, while the combustion gas that burns violently in the outer tube 1 in the furnace inner wall 2 proceeds in this manner, the furnace atmosphere is heated by the radiant heat of the combustion gas. The combustion exhaust gas discharged from the flue exhaust port 5 to the outside air through the outer pipe extending horizontally outside the furnace preheats the air sent from the combustion air inlet 9 into the inner pipe 6. In FIG. 1, reference numeral 16 denotes a heat exchange fin.
[0005]
The effective radiant heat generation efficiency into the furnace of the conventional radiant tube burner having such a structure and operation is about 50 to 63.3% of the calorie burned of the used fuel, and the heat loss of exhaust gas from the flue exhaust port 5 is reduced. Is 31.6% on average. The other heat dissipation loss is about 5%.
[0006]
[Problems to be solved by the invention]
An object of the present invention is to provide a single-ended radiant tube burner that can be expected to have higher thermal efficiency than conventional ones. In particular, an object of the present invention is to increase the effective radiant heat generation efficiency of the burner by reducing the heat loss due to the exhaust gas from the stack exhaust port 5.
[0007]
[Means for Solving the Problems]
In order to reduce the heat loss due to the exhaust gas from the stack exhaust port 5, the combustion exhaust gas sent into the outer tube 1 outside the furnace is included in the exhaust gas before being discharged from the stack exhaust port 5 to the outside air. The inventor of the present application diligently examined whether the heat calories could be exchanged and used well by preheating the combustion air sent into the inner pipe 6. First, it was devised that the outer tube 1 and the inner tube 6 outside the furnace were horizontally extended outward as they were, and the combustion air sent into the inner tube 6 was passed through the outer tube 1 outside. Heat exchange and preheating were performed in a longer flow path by the flue gas passing therethrough.
[0008]
However, this has revealed that the space for installing the heating furnace is unnecessarily wide and large, which is inconvenient both economically and in terms of work. Further, if the combustion air is to be warmed from the outside with the combustion exhaust gas passing through the outer tube, the heat of the combustion exhaust gas passing through the outer tube 1 that is in contact with the outside air is radiated to the outside air rather than warming the combustion air. It turned out to be a lot.
[0009]
Therefore, in the present invention, the above-mentioned problem is solved by raising the flue exhaust port 5 and extending upward, and extending the combustion air inlet 9 upward so as to surround the flue exhaust port from the outside. And solved.
Further details of the combustion burner according to the present invention will be made clear in the embodiments described below.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Referring to FIG. 2, the structure and operation of the single-ended combustion burner of the heating furnace according to the present invention will be described. However, the outer tube 1, the heat insulating furnace wall 2, the closed end 3 of the outer tube 1, the other end 4 of the outer tube 1, the flue exhaust port 5, the inner tube 6, and the tip opening of the inner tube 6 in FIG. 7, the other end 8 of the inner tube 6, the combustion tube 10, the fuel injection port 11 of the combustion tube 10, the other end 12, the combustion gas inlet 13, and the heat exchange fin 16 of FIG. The corresponding parts of the single-ended combustion burner are the same, their construction is the same as that described above, and their operation is the same as that of the above. Therefore, to avoid distracting the specification, their configuration and operation will not be described again here.
[0011]
In the single-ended combustion burner according to the present invention, as shown in FIG. 2, the flue exhaust port 5 becomes a cylindrical tube 14 and rises upward. On the other hand, the combustion air inlet 9 surrounds the cylindrical exhaust pipe 14 and is connected to a lower part of a vertically rising pipe 15. Therefore, the combustion air sent into the pipe 15 from above to below the pipe 15 flows upward through the cylindrical exhaust pipe 14 before being sent from the combustion air inlet 9 into the inner pipe 6. It is sufficiently preheated by the combustion exhaust gas which goes toward the atmosphere and proceeds. Fins are provided on the outer wall of the cylindrical exhaust pipe 14, and the air flowing downward in the pipe 15 is spirally rotated so that the efficiency of heat exchange between the combustion exhaust gas and the combustion air flowing in opposite directions to each other. Can be further increased.
[0012]
Example A single-ended burner according to the present invention having a diameter of 160 mm, an effective radiation length of 1200 mm and a heat generation function of up to 35,000 Kcl was prepared by using propane gas as a combustion gas and sufficiently preheated combustion as described above. By burning with the air for use, the atmosphere temperature in the heating furnace was maintained at 900 ° C. At this time, the effective heat generation efficiency was 83.6%, the heat loss due to exhaust gas was 13.5%, and the heat loss due to dissipation was 3.6%.
[0013]
【The invention's effect】
The above-mentioned effective heat generation efficiency of the burner of the present invention far exceeds the numerical value described above for the efficiency of the conventional burner, and the heat loss due to exhaust gas and the heat loss due to dissipation of the burner according to the present invention are as described above. [0005] These values are remarkably lower than those of the prior art.
[Brief description of the drawings]
FIG. 1 is an explanatory sectional view showing a conventional single-ended combustion burner.
FIG. 2 is an explanatory sectional view similar to FIG. 1, showing a single-ended combustion burner according to the present invention.
[Explanation of symbols]
1-Outer tube of burner 2-Insulated furnace wall of heating furnace 3-Closed end of outer tube 1-Other end of outer tube 1-Flue gas outlet 6-Inner tube 7-Tip opening 8 of inner tube 6- The other end 9 of the inner pipe 6-combustion air inlet 10-combustion pipe 11-fuel injection port 12 of combustion pipe 10-other end 13 of combustion pipe 10-combustion gas inlet 14 to combustion pipe 10-flue exhaust port 5 Exhaust pipe 15 leading to the air supply pipe 16 to the combustion air inlet 9-fins for heat exchange

Claims (1)

An outer tube having one end closed in the heating furnace and the other end connected to a flue exhaust port outside the heating furnace, and an outer end provided in the outer tube, the tip of which opens toward the other end of the outer tube to be closed and the other end Is connected to a combustion air inlet outside the heating furnace, and a combustion pipe provided in the inner pipe, a combustion injection port at a tip thereof opens toward the opening of the inner pipe, and the other end connects to a combustion gas inlet. A combustion burner comprising: the above-mentioned flue exhaust port rising and extending upward; and the above-mentioned combustion air inlet rising and surrounding the flue exhaust port from the outside and extending upward. Single-end combustion burner for heating furnace.

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