JPH11304367A - Regenerative burner in ceramic kiln - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the local heating of a material to be baked by making the temperature distribution of a furnace uniform. SOLUTION: A regenerative burner is disposed on the furnace wall 10 of a ceramic kiln to alternately repeat combustion and exhaust. A gas nozzle 2 is divided into two or more relative to one air passage 1 having a heat storage body 3 so that a flame does not reach an opposed wall. Thus, the end of the flame is prevented from coming into contact with a material W to be baked. The air passage 1 is provided below or sideward of the gas nozzle 2. Thus, even when air for combustion sinks downward, it does not intersect the flow of main gas.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a regenerative burner in a ceramic firing furnace.

[0002]

2. Description of the Related Art A regenerative burner alternately repeats combustion and exhaust, recovers sensible heat of a high-temperature combustion gas to a regenerator during exhaust, and preheats combustion air by the regenerator during combustion. By doing so, it is a burner capable of performing heat-efficient combustion.

FIG. 3 is a view showing an example of a ceramic firing furnace in which a regenerative burner is attached to a furnace wall 10. In this figure, a roller hearth kiln equipped with rollers 11 is shown. The regenerative burners are usually provided in pairs on the left and right furnace walls 10, and FIG. 3 shows only the regenerative burners on the left side, but the same regenerative burners are also provided on the right side. I have.

In FIG. 3, reference numeral 1 denotes a gas nozzle, and reference numeral 2 denotes an air flow passage provided immediately above and in parallel with the gas nozzle 1, and a regenerative burner is constituted by a combination of these. The main gas is supplied to the gas nozzle 1 intermittently in a short cycle of about 30 seconds, and a premix gas for pilot is supplied even while the main gas is stopped. In the case of a general ceramic firing furnace, the main gas injected from the gas nozzle 1 is 30,000 k
It has about cal / h of heat.

[0005] The air flow path 2 contains a heat storage body 3 made of a ceramic honeycomb or the like. As described above, the regenerator 3 is heated when the high-temperature furnace gas is exhausted through the air flow path 2, and the preheat is performed by the regenerator 3 when the combustion air is supplied next time. It has become.

[0006]

However, in such a conventional ceramic sintering furnace equipped with a regenerative burner, the temperature distribution in the furnace may be deteriorated or the article W to be baked may be locally heated. Was. One of the causes is that, in many cases, the width of the ceramic firing furnace is as narrow as about 600 to 1200 mm, so that the combustion of the main gas ejected in the furnace width direction is not completed within the furnace width, as shown in FIG. Is that the tip of the flame strikes the furnace wall 10 facing it. As a result, the tip of the flame bends in the direction of the article to be fired W, causing local heating.

[0007] Another cause is that the combustion air injected into the furnace from the air passage 2 is preheated by the regenerator 3 but is lower in temperature than the furnace temperature. To form a local high-temperature region near the intersection with the main gas from the gas nozzle 1. In addition, when the combustion air sinks in this way, the flame is also bent downward, causing local heating of the article to be fired W.

The present invention solves the above-mentioned conventional problems and provides a regenerative burner in a ceramic firing furnace in which the temperature distribution in the furnace is made uniform and local heating of the article to be fired W can be prevented. It was done to do so.

[0009]

Means for Solving the Problems According to the first aspect of the present invention, there is provided a regenerative burner which is installed on a furnace wall and alternately repeats combustion and exhaust, comprising a regenerator. The gas nozzle is divided into two or more for one air flow path. According to the second aspect of the invention, by dividing the gas nozzle into two or more for one air flow path, the gas calorific value of each gas nozzle can be increased by 1500.
0kcal / h or less. In order to solve the same problem, an invention according to claim 3 is a regenerative burner which is installed on a furnace wall and alternately repeats combustion and exhaust, wherein an air flow path is provided below or beside a gas nozzle. It is characterized by the following.

According to the first and second aspects of the present invention, the gas nozzles are dispersed to complete the combustion of the main gas within the furnace width, thereby preventing local heating due to the flame tip hitting the workpiece W. be able to. According to the third aspect of the invention, even if the combustion air ejected from the air flow path sinks downward, it does not intersect with the main gas, thereby preventing local heating and uniforming the temperature distribution in the furnace.

[0011]

Embodiments of the present invention will be described below.
FIG. 1 is a cross-sectional view of a ceramic firing furnace equipped with a regenerative burner that alternately repeats combustion and exhaust.
As in the prior art, the regenerative burners are installed on both sides of 0 and the regenerative burners are composed of the air flow path 1 and the gas nozzle 2. However, in the present invention, 1
The gas nozzle 2 is divided into two or more pieces for each air flow path 1. Accordingly, the main gas ejected from each gas nozzle 2 can be suppressed to less than half without reducing the output of each regenerative burner, and the length of the flame can be shortened. Accordingly, unlike the related art, the tip of the flame does not hit the facing furnace wall 10 to bend in the direction of the article to be fired W, so that local heating of the article to be fired W can be prevented. In the present invention, the arrangement of the plurality of gas nozzles 2 is not particularly limited. For example, as shown in FIG. 1, the gas nozzles 2 can be arranged horizontally.

In the invention of claim 2, by dividing the gas nozzle 2 into two or more for one air flow path 1,
The calorific value of the gas from each gas nozzle 2 was set to 15,000 kcal / h or less. By suppressing the amount of gas heat while keeping the air supply amount from the air flow path 1 constant, even if the furnace width is 600 to 1200 mm, combustion is completed before the main gas flow reaches the opposite surface. Can be done. Accordingly, unlike the related art, the tip of the flame does not hit the facing furnace wall 10 to bend in the direction of the article to be fired W, so that local heating of the article to be fired W can be prevented. Moreover, the amount of combustion heat of the regenerative burner as a whole does not decrease.

FIG. 2 is a diagram showing an embodiment of the third aspect of the present invention. As shown in this figure, in the invention of claim 3, the air flow path 1 is provided below or beside the gas nozzle 2.
In this case, the gas nozzle 2 may be single or plural. If the air flow path 1 is provided below or beside the gas nozzle 2 as described above, even if the combustion air blown out from the air flow path 1 bends downward as shown by the arrow, the main air blown out from the gas nozzle 2 It does not cross the gas flow. Therefore, the air passage 1 is connected to the gas nozzle 2 as in the prior art.
Unlike the one provided directly above the, local heating can be prevented,
The temperature distribution in the furnace can be made uniform. Note that the gas nozzle 2 can be inclined at a slight angle to the opposite side of the air flow path 1.

[0014]

As described above, according to the first and second aspects of the present invention, the gas nozzle is dispersed to complete the combustion of the main gas within the furnace width, and the tip of the flame strikes the workpiece W. This can prevent local heating. Further, according to the invention of claim 3, even if the combustion air ejected from the air flow path sinks downward, it does not intersect with the flow of the main gas, thereby preventing local heating and making the temperature distribution in the furnace uniform. There are advantages.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an embodiment of the present invention.

FIG. 2 is a sectional view showing an embodiment of the invention of claim 3;

FIG. 3 is a cross-sectional view showing a problem of the conventional example.

FIG. 4 is a sectional view showing another problem of the conventional example.

[Explanation of symbols]

 W Product to be fired 1 Air flow path 2 Gas nozzle 3 Heat storage material 10 Furnace wall 11 Roller

Claims (3)

[Claims] 1. A regenerative burner which is installed on a furnace wall and alternately repeats combustion and exhaust, wherein a gas nozzle is divided into two or more for one air passage provided with a regenerator. Storage burner in a ceramic firing furnace. 2. A regenerative burner which is installed on a furnace wall and alternately repeats combustion and exhaust, wherein a gas nozzle is divided into two or more for one air flow path provided with a regenerator. A regenerative burner in a ceramic sintering furnace, wherein a gas calorie of a gas nozzle is set to 15,000 kcal / h or less. 3. A regenerative burner which is installed on a furnace wall and repeats combustion and exhaust alternately, wherein an air flow path is provided below or beside a gas nozzle.