JP2610514B2 - Empty structure of refractories for heat storage room - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to an empty stacking structure of refractories used for heat storage in a heat storage chamber of a glass melting furnace, and more particularly, to a rectangular cast refractory which is melt-cast. The present invention relates to an empty stack structure of refractories for a heat storage room using bricks.

[Related Art] Refractories for a heat storage chamber of a glass melting furnace are heated mainly by radiant heat transfer by high-temperature exhaust gas discharged from a discharge port and led to a heat storage chamber, and the heated refractory is cold. The combustion air is preheated exclusively by convection heat transfer.

Conventionally, as an empty stacking structure of the refractory for a heat storage chamber, a structure described in JP-A-55-149139 is known.

As shown in FIG. 9, this rechargeable material for a heat storage room has an outer contour octagon in which all the ridge lines of a rectangular tube are cut off to form a ridge surface 1a, and convex portions corresponding to upper and lower end surfaces are formed. Part 1b, recess
A large number of refractory bricks 1 each having a rectangular tube shape formed with 1c are formed by engaging the convex portions 1b and the concave portions 1c on the upper and lower end surfaces and simultaneously adjoining ones.
1a is abutted and stacked in multiple layers, and a large number of gas-throughflow furnaces 2 coaxial with the vertical axis of the furnace and having a rectangular cross section are formed in the heat storage chamber.

According to this empty stacking structure, it is possible to increase the specific surface area while keeping the pressure loss of the gas flowing through the gas flow passage small.

[Problems to be solved by the invention]

However, in the above-mentioned conventional structure for stacking refractories for a heat storage chamber, a large number of independent gas passages 2 having inlets and outlets only at the upper and lower sides of the heat storage chamber are formed. The gas that enters from the inlet will exit the other outlet as it is.

On the other hand, the high-temperature exhaust gas flowing into the heat storage chamber from the outlet of the glass tank kiln is not uniformly distributed at both the temperature and the flow velocity in the cross section of the gas flow. In order to reduce such non-uniformity of the exhaust gas as much as possible, the upper space of the heat storage chamber may be made large, but the non-uniformity still does not disappear. Therefore, the high-temperature lung gas which is not uniform in temperature and speed is distributed as it is in the upper space of the heat storage chamber and flows into the individual gas passages 2. As a result, the high-temperature exhaust gas distributed to each gas passage 2 becomes non-uniform both in temperature and in flow rate, that is, in volume, and as a result, the heat exchange rate becomes uneven in the horizontal distribution of the refractory for the heat storage chamber.

As a result, a temperature difference occurs between the gas flow passages 2. This temperature difference is not corrected even with the lapse of time. May be discharged directly into the flue. As a result, there is an inconvenience that the heat exchange efficiency of the entire heat storage chamber performed within a certain time is reduced. The same applies to the heat exchange between the heated refractory and the cold combustion air.

Therefore, an object of the present invention is to provide an empty stack structure of refractories for a heat storage chamber, which can correct the temperature difference between the gas passages and improve the overall heat exchange efficiency.

[Means for solving the problem]

In order to solve the above-mentioned problems, the present invention relates to a heat storage chamber refractory empty stacking structure in which a large number of rectangular tubular refractory bricks are stacked in piles to form a large number of vertical gas passages in the heat storage chamber. Standard height refractory bricks with irregularities on the surface and refractory bricks appropriately lower than this are piled up in multiple layers by engaging adjacent concavities and convexities so that the adjacent gas passages communicate at required positions It was done.

(Operation)

According to the above-described means, the refractory bricks are integrally engaged with each other, and a horizontal bypass is formed at a required position of the adjacent gas passage.

The refractory brick is an electro-melt cast material such as alumina-silica-zirconia, and the second refractory brick having a standard height lower than the first refractory brick is 1/2 to 9/10 of the first refractory brick. If the height exceeds 9/10, the height of the space formed between the first refractory brick is too small, and the suspended matter in the gas adheres and melts during use. Eventually, there is a risk of clogging, and if it is less than 1/2, the uneven surface of the ridge supporting the refractory brick is too small, and the entire empty stacking structure becomes mechanically unstable.

Further, unless the number of the second refractory brick occupied by the same step is less than half, a stable structure cannot be obtained as a whole.

〔Example〕

Hereinafter, an embodiment of the present invention will be described with reference to FIGS.

1, 2 and 3 are perspective views of a part of an empty stacking structure of refractories for a heat storage chamber showing one embodiment of the present invention, a sectional view taken along line II-II in FIG. 1 and FIG. FIG. 3 is a sectional view taken along line III-III.

This rechargeable structure for a regenerator has a first refractory brick 5 having a standard height (for example, 150 mm) and a second refractory having a height not less than 1/2 and not more than 9/10 the standard height. And a brick 6.

Both refractory bricks 5 and 6 are electro-melt cast products such as alumina-silica-zirconia, and as shown in FIG. 4, all ridges of the rectangular cylinder are cut off to form an octagonal outer contour. , Serrations 7 extending in the direction perpendicular to the axial direction (vertical direction in the figure) on all the ridges and developing in the axial direction
Are provided so that adjacent members are prevented from moving in the axial direction and mesh with each other. Further, the hollow portions 8 in the axial direction of the refractory bricks 5 and 6 form a gas passage which will be described later.

As shown in FIGS. 1 to 3, the refractory for the heat storage chamber is constructed by the first refractory bricks 5 and 6.
The end faces of the refractory bricks 5 are formed by vertically stacking in multiple stages in the vertical direction to form gas passages 9 in the vertical direction, and engaging the unevenness 7 of the ridges of the four refractory bricks 5 on a horizontal plane.
The first refractory brick 5 is replaced by a second refractory brick 6 at every third stage of the first refractory brick 5, and the second refractory brick 6 is adjacent to the second refractory brick 6. The gas flow passages 9 are vertically shifted by one step.

Therefore, above or below the second refractory brick 6 (the upper side is shown in the figure), a space portion 11 is formed between the second refractory brick 6 and the first refractory brick 5 by an amount lower than the standard height. The section 11 functions as a bypass that connects the adjacent gas through passages 9 and 10 in the horizontal direction, while the refractory bricks 9 and 10 above the space section 11 are adjacent to each other in the horizontal direction.
, It is maintained very stable.

In this way, a large number of gas passages 9 and 10
Is formed, the gas flow can move horizontally from a high pressure place to a low pressure place.

The most effective use of this horizontal movement of the gas flow is when the high-temperature gas flow guided from the outlet of the glass melting furnace heats the cooled refractory, On the other hand, when the cooling air is pre-heated with a high-temperature refractory, the combustion air flows upward from below the refractory. This method is the most common method conventionally employed. As is well known, the reason is that the refractory can be heated evenly in consideration of the upward buoyancy of the high-temperature gas.

More specifically, when the high-temperature gas heats the refractory while moving down the gas flow passages 9 and 10, even if a portion that is heated to a higher temperature than the surroundings occurs for some reason, that portion is not heated by another portion. The temperature difference with the high-temperature gas is smaller than that of the portion. Generally, the amount of heat transfer between a heated object and a heated object is represented by a function of a temperature difference. Therefore, the gas passing through that portion next time maintains a high temperature because the amount of heat radiation is smaller than that of the other portions.

On the other hand, a gas having a higher temperature than the surroundings as a property of the gas body has a property of having a greater buoyancy than the surroundings.
Since the direction of the buoyancy of the gas body is upward, the buoyancy exerts resistance on the flow of the gas flow and decreases the pressure of the gas in the locally high temperature gas flow descending from above. Therefore, the flow rate is reduced. Then, the reduced gas flows through the bypass to a low-temperature surrounding area in the horizontal direction, as indicated by arrows in FIGS. In the portion where the flow rate is reduced in this way, the heating of the refractory is delayed from the surroundings, and conversely, the rate of temperature rise in the portion where the flow rate is increased is increased. As a result, over time, locally hot refractories will gradually equilibrate with the ambient temperature.

This is also true of the fact that even if the gas flow initially has an uneven flow velocity in some places, the unevenness is gradually eliminated by the difference in buoyancy caused by the difference in the degree of cooling by heat exchange with the refractory. Elapses. For the same reason, if there is a location where the temperature of the refractory is locally low, the hot gas flow through it will be well cooled and less buoyant,
Thus, the flow is promoted and the refractory is well heated and gradually equilibrates with the surrounding temperature.

As described above, when the refractory is heated by the high-temperature gas descending through the gas passages 9 and 10, the gas flow can freely flow in the horizontal direction by the bypass. Heated.

Further, the above-described principle works so as to correct and eliminate even if the hot gas flow before flowing into the refractory has an uneven temperature distribution even in the cross section of the flow. This means that the locally hot gas does not flow out of the heat storage chamber at a high temperature without giving heat to the refractory.

Furthermore, the principle of uniform heating using the buoyancy of gas is that when preheating cold combustion air with a high-temperature refractory, cool air is passed so as to ascend the gas passages 9 and 10 of the high-temperature refractory. The present invention is also applied to the case where the air is efficiently and uniformly heated without leaving a high-temperature refractory locally.

In the above embodiment, the first refractory brick 5 is
After the stacking of the second refractory bricks, the pattern of stacking the second refractory brick 6 by one step is repeated. However, the present invention is not limited to this. For example, empty stacks may be alternately stacked one by one, or the former may be continuously stacked three or more stages, and then the latter may be empty stacked one stage, or the replacement of the second refractory brick may be partially performed. You may. In short, it suffices to form a bypass to such an extent that high-temperature exhaust gas is not discharged locally as it is, and the space 11 forming the bypass is
For this purpose, it is necessary not to reduce the specific surface area of the refractory much. In this case, the total volume of the space 11 should not be increased so much, and preferably 20% or less of the volume of the entire refractory.

As described above, the height of the second refractory brick 6 is preferably not less than 1/2 and not more than 9/10 of the standard refractory brick 5 having a standard height. If the height is too small, the suspended matter in the gas will adhere and melt during use, and there is a danger that it will eventually become blocked. If it is less than 1/2, the unevenness of the ridges that support the refractory bricks 9 and 10 Is too small and the entire empty stacking structure becomes mechanically unstable. Similarly, unless the number of the second refractory bricks 6 occupied by the same step is less than half, a stable structure cannot be obtained as a whole.

Further, the irregularities 7 on all the ridge surfaces of the refractory bricks 5 and 6 are not limited to the sawtooth-shaped ones extending in the direction perpendicular to the axial direction and developing in the axial direction. For example, as shown in FIG. It may be a hemispherical unevenness 7a.

Furthermore, the inner and outer surfaces of both refractory bricks 5, 6 are
In addition to the case of a flat surface as shown in FIGS. 5 and 5, for example, as shown in FIG. 6, a saw-tooth shape extending in the circumferential direction perpendicular to the axial direction on the inner surface and the outer surface and developing in the axial direction 12, unevenness
13 or, as shown in FIG. 7, a serration 14 extending in the axial direction and extending in the circumferential direction is formed on the inner surface, and the serrations 14 are formed on the outer surface in the circumferential direction. The sawtooth-shaped unevenness 13 that develops in the axial direction may be formed.
By doing so, the specific surface area of the refractory can be increased, and the gas flows flowing through the gas passages 9 and 10 can be made turbulent.

FIG. 8 is a perspective view of a part of an empty stack structure of a refractory for a heat storage chamber showing another embodiment of the present invention, in which a refractory brick of the type shown in FIG. 6 is used.

An empty stack structure of the refractory for a heat storage room of this embodiment has a first refractory brick 5 of a standard height and a half or more of the standard height 9/10 as in the above-described embodiment. And second refractory bricks 6 having the following heights.
The space formed by meshing the sawtooth-shaped irregularities 7 provided on the ridge surface of each other with each other and being surrounded by four refractory bricks 5, 6 as a minimum unit, and the hollow portions of the individual refractory bricks 5, 6 8 are stacked in multiple stages with the end faces of the refractory bricks 5 and 6 abutting or facing each other so as to form a large number of gas passages 9 in the vertical direction by being alternately connected in the upper and lower stages. The short second refractory brick 6 is appropriately arranged. Above or below the second refractory brick 6 (the upper side is shown in the drawing), as in the above-described embodiment. A space 11 functioning as a bypass connecting the adjacent gas flow passages 9
Are formed.

〔The invention's effect〕

As described above, according to the present invention, the refractory bricks are integrally engaged with each other, and a horizontal bypass is formed at a required position of the adjacent gas passage, so that the refractory empty stacking structure is dynamically When the refractory is heated by flowing the high-temperature gas down the gas flow passage and heating the refractory, the gas flow before entering the gas flow passage of the refractory is uneven in temperature and flow velocity in its cross section. Even if it has a distribution, it flows freely in the horizontal direction through the above-mentioned bypass after entering each gas passage and heats the entire refractory to the same temperature, in other words, the gas flow is cooled evenly You can move freely as you do.

Therefore, since a part of the gas flow does not flow out of the heat storage chamber at a high temperature, the overall heat exchange efficiency increases. In addition, since the refractory can be heated evenly in any part, it is not damaged by local heating.

Similarly, when heating the combustion air cooled by the high-temperature refractory, the combustion air is efficiently heated even when the cold combustion air flows so as to ascend the gas passage of the high-temperature refractory. And because the refractory is cooled evenly, there is less damage from localized quenching.

[Brief description of the drawings]

1 to 8 show an embodiment of the present invention.
FIG. 2, FIG. 2 and FIG. 3 are perspective views of a part of an empty stacking structure of refractories for a heat storage chamber of one embodiment, a sectional view taken along line II-II in FIG. 1, and a sectional view taken along line III-III in FIG. , FIG. 4 is a perspective view of the refractory brick used in the empty stacking structure of FIG. 1, FIG.
6 and 7 are perspective views of a refractory brick of another embodiment, respectively, FIG. 8 is a perspective view of a part of an empty stack structure of a refractory for a heat storage room of another embodiment, and FIG. It is a perspective view of a part of empty storage structure of refractories for heat storage rooms. 5: first refractory brick, 6: second refractory brick 7,7a: unevenness, 9, 10, gas passage 11: space

 ────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A 64-24023 (JP, A) JP-A 64-24022 (JP, A) JP-A 63-213794 (JP, A)

Claims (1)

(57) [Claims] 1. A heat storage room refractory stacking structure in which a large number of rectangular tubular refractory bricks are piled up to form a large number of gas passages in a vertical direction in a heat storage chamber, and irregularities are provided on a ridge surface. A firebrick of standard height and a firebrick appropriately lower than this are stacked in multiple layers by interlocking the concavities and convexities of adjacent ones so that the adjacent gas passages communicate at predetermined positions. Empty structure of refractories for heat storage room.