JPH07280253A - Thermal storage burner - Google Patents

Abstract

(57) [Summary] [Purpose] Low pressure loss, spalling resistance,
Moreover, a heat storage type burner capable of high heat response is provided. In a heat storage type burner having heat storage bodies 14 and 15 therein, and a heat storage chamber 13 that alternately passes exhaust gas and combustion air, the heat storage bodies 14 and 15 are parallel to the flow direction of the air flow. A tube assembly consisting of a large number of independent small-diameter tubes 16 arranged in the above was used.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat storage type burner having a pair of burners and a heat storage chamber which alternately perform combustion and exhaust.

[0002]

2. Description of the Related Art In an industrial furnace such as a heating furnace, heat treatment furnace, melting furnace or incinerator, in order to improve thermal efficiency,
A regenerative burner is used in which exhaust and combustion are performed alternately, heat is recovered by a regenerator housed in a regenerator during exhaust, and combustion air is heated during combustion. As the heat storage body, a spherical heat storage body composed of a large number of small spheres as described in JP-A-59-122893, or JP-A-4-25.
A heat storage body having a honeycomb structure as described in Japanese Patent No. 1190 is known.

[0003]

However, the spherical heat storage body has a drawback that the pressure loss is large. Moreover, although the heat storage material having a honeycomb structure has good air permeability, since it has an integral structure as a whole, there is a problem that it is cracked or trapped by applying thermal shock of heating and cooling, and the spalling resistance is poor. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a regenerative burner that has a low pressure loss, has a spalling resistance, and can have a high thermal response.

[0004]

A method according to the above-mentioned object.
The heat storage burner described has a heat storage body inside, and in the heat storage burner provided with a heat storage chamber that alternately passes exhaust gas and combustion air, the heat storage body is arranged in parallel to the flow direction of the air flow. It is composed of a tube assembly consisting of many independent small diameter tubes. A heat storage burner according to a second aspect is the heat storage burner according to the first aspect, in which the tube assembly is arranged in a plurality of stages in the flow direction of the air flow.

[0005]

In the heat storage type burner according to claim 1 or 2, since the heat storage body is a tube assembly composed of a large number of independent small diameter pipes arranged in parallel to the flow direction of the air flow, the exhaust gas is reduced in the small diameter pipes. Passes inside and between adjacent small diameter pipes. Therefore, since the flow of the exhaust gas is straight and the ventilation area is large, the pressure loss is small. Also, because the individual small diameter tubes are independent, they are not interleaved and therefore
Even if the heating and cooling are partial, thermal distortion is unlikely to occur in the whole, and even if a trap occurs, it will end only with the small diameter tube, so the spalling resistance is great. Since the exhaust gas passes through not only the inside of the small diameter tube but also the outside thereof, the thermal response is high. Particularly, as in the heat storage type burner according to claim 2, by dividing the small-diameter pipe into a plurality of stages in the flow direction, the temperature difference between the inlet side and the outlet side of one small-diameter pipe can be reduced. Further, the spalling resistance is improved.

[0006]

Embodiments of the present invention will now be described with reference to the accompanying drawings to provide an understanding of the present invention. Here, FIG. 1 is a cross-sectional view of a heat storage type burner on one side, and FIG. 2 is a perspective view of a heat storage body.

As shown in FIG. 1, a heat storage type burner 10 according to an embodiment of the present invention has a burner 12 having a fuel supply section 11 and a heat storage chamber 13 connected to the burner 12. There is.

Inside the heat storage chamber 13, heat storage bodies 14, 1 are provided.
5, the heat storage bodies 14 and 15 are each formed of a tube assembly in which a large number of small diameter tubes 16 are bundled as shown in FIG. 2, and each has a two-layer structure. And
In the laminated portion, the axial cores of the upper and lower small-diameter pipes 16 are changed so that the airflow is sufficiently in contact with the small-diameter pipes 16. The small-diameter tube 16 has a diameter of 16 mm to 25 mm and a length of 50 mm to 150 mm, depending on the size of the heat storage bodies 14 and 15 as a whole.
It is made of ceramics such as alumina or heat-resistant metal.

As described above, since the small diameter pipe 16 is divided in the lengthwise direction and arranged in layers, it is possible to reduce the temperature difference between the inlet side and the outlet side of the small diameter pipe, and the spalling resistance. Can be improved.

Under the heat storage bodies 14 and 15, there are provided heat storage body support bases 17 and 18 made of, for example, a mesh made of a heat-resistant metal or a ceramic plate having a large number of ventilation holes. 15 is held in place.

Therefore, when the heat storage type burner 10 is used, the combustion exhaust gas from the other pair of burners flows like a streamline A at the time of exhaust, whereby the heat storage bodies 14, 1
5 is heated, combustion air flows like a streamline B at the time of combustion, and is preheated from the heat storage bodies 14 and 15.

In the above embodiment, the small diameter pipe 16 is
Although the layers are arranged in two stages, it is also possible to shorten the length and arrange in multiple layers or stages.

[0013]

The heat storage type burner according to claims 1 and 2 is
As is clear from the above description, since the heat storage body is composed of independent small-diameter tubes, it is possible to mitigate the thermal shock caused by heat transfer, thereby improving spalling resistance. Further, since each small-diameter pipe is arranged parallel to the flow of the air flow, the pressure loss is extremely small, and furthermore, the air flow passes through the inside and outside of the small-diameter pipe, so that the heat transfer area is large and the thermal response is excellent. Particularly, in the regenerative burner according to the second aspect, since each small-diameter pipe is divided in the flow direction of the air flow, the temperature difference between the inlet side and the outlet side of each small-diameter pipe is small, and the thermal stress generated inside is small. Becomes smaller and the heat transfer area is further expanded, so that spalling resistance and thermal response are improved.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a heat storage type burner on one side.

FIG. 2 is a perspective view of a heat storage body.

[Explanation of symbols]

 10 heat storage type burner 11 fuel supply section 12 burner 13 heat storage chamber 14 heat storage body 15 heat storage body 16 small diameter pipe 17 heat storage body support 18 heat storage body support

Claims (2)

[Claims] 1. A heat storage type burner having a heat storage body therein and having a heat storage chamber for alternately passing exhaust gas and combustion air, wherein a plurality of heat storage bodies are arranged in parallel to a flow direction of an air flow. A regenerative burner characterized by being composed of a tube assembly consisting of independent small diameter tubes. 2. The heat storage burner according to claim 1, wherein the tube assembly is arranged in a plurality of stages in the flow direction of the air flow.