WO2018096863A1

WO2018096863A1 - Heat storage device, glass melting device, and glass article manufacturing method

Info

Publication number: WO2018096863A1
Application number: PCT/JP2017/038384
Authority: WO
Inventors: 正巳北野; 山村　真司; 純平吉川
Original assignee: Ａｇｃセラミックス株式会社
Priority date: 2016-11-28
Filing date: 2017-10-24
Publication date: 2018-05-31
Also published as: JPWO2018096863A1; JP6962928B2

Abstract

Provided is a heat storage device that can efficiently store heat in a heat storing body by utilizing exhaust gas, can efficiently heat combustion air using the heat storing body, and can suppress a situation in which the heat storing body becomes brittle. A heat storage device 10, which is for a glass melting furnace, comprises: a first heat storage chamber 11 in an upper part of which there is provided a connection port 13 for connecting to the glass melting furnace and inside of which a heat storing body 11a is disposed; a second heat storage chamber 12 which is adjacent to the first heat storage chamber 11, in an upper part of which there is provided a connection duct 14 for connecting to the outside atmosphere, and inside of which a heat storing body 12a is disposed; and a flow passage 15 that connects the first heat storage chamber 11 and the second heat storage chamber 12 to each other at the bottom of the chambers. A ratio (S2/S1) between the cross-sectional area (S1) of the first heat storage chamber 11 in a planar cross section and the cross-sectional area (S2) of the second heat storage chamber 12 in a planar cross section is 0.2-0.62.

Description

Heat storage device, glass melting device and method for manufacturing glass article

The present invention relates to a heat storage device for a glass melting furnace, a glass melting device having the heat storage device, and a method for producing a glass article using the glass melting device.

In the manufacture of industrial glass products, a large amount of glass material is melted using a glass melting furnace. The glass melting kiln needs to be kept at a high temperature in order to maintain the molten state of the glass. In order to maintain such a high temperature state, combustion air and fuel are introduced into the glass melting furnace and burned.

At this time, the introduction of the combustion air into the glass melting furnace is generally performed by passing through a heat storage device arranged in parallel with the glass melting furnace. Further, the exhaust gas generated by the combustion in the glass melting furnace is also passed through the heat storage device and discharged from the glass melting furnace to the external atmosphere. That is, in the heat storage device, the flow of combustion air and exhaust gas are in opposite directions.

The heat storage device used here has a heat storage body in which checker bricks are stacked inside, and stores the heat by passing high-temperature exhaust gas discharged along with combustion between the checker bricks, and the heat is stored. The combustion air that is then fed into the glass melting furnace is heated by heat. The heated combustion air is mixed with the fuel gas and burned inside the glass melting furnace, and maintains a predetermined high temperature state. As described above, by efficiently using the exhaust heat of the exhaust gas, the energy used when the glass is melted can be suppressed, and the manufacturing cost can be reduced. Moreover, since this operation only needs to distribute | circulate gas to a thermal storage apparatus, it can be performed by simple operation. Various configurations of such a heat storage device have been studied for the purpose of improving efficiency (see, for example, Patent Documents 1 and 2).

In addition, when heating the heat accumulator with combustion exhaust gas, the uppermost heat accumulator packed in the heat accumulator chamber is improved in order to improve the point that the combustion exhaust gas cannot be passed uniformly over the entire heat accumulator due to drift. A member in which the members are stacked stepwise from the port mouth side of the heat storage chamber toward the opposite side wall is known (for example, see Patent Document 3).

JP 09-12315 A U.S. Pat. No. 4,372,770 Japanese Patent Laid-Open No. 08-157222

By the way, in the case of a heat storage device (double-pass heat storage device) having two heat storage chambers, the heat exchangeable flow path is made longer than in the case of a heat storage device (single-pass heat storage device) having only one heat storage chamber. Therefore, the exhaust heat of the exhaust gas can be used efficiently. As a heat storage device having two heat storage chambers, a heat storage device as shown in FIG. 7 can be considered. The heat storage device 50 includes a first heat storage chamber 51 in which a heat storage body 51a is disposed, a second heat storage chamber 52 that is adjacent to the first heat storage chamber 51, and in which a heat storage body 52a is disposed, Have Here, the first heat storage chamber 51 is provided with a connection port 53 for connection with a glass melting furnace, and the second heat storage chamber 52 is provided with a connection duct 54 for connection with an external atmosphere. It has been. Moreover, the 1st heat storage chamber 51 and the 2nd heat storage chamber 52 are mutually connected by the flow path 55 below each other.

When discharging the exhaust gas generated in the glass melting furnace, the heat storage device 50 introduces the exhaust gas into the first heat storage chamber 51 from the connection port 53 connected to the glass melting furnace, and then introduces it. The exhaust gas is transferred to the second heat storage chamber 52 via the flow passage 55. The transferred exhaust gas flows through the second heat storage chamber 52 and is directly discharged from the connection duct 54 to the external atmosphere.

At this time, the exhaust gas is heated to a high temperature in the glass melting furnace, and the high temperature exhaust gas is circulated through the

heat storage bodies

51a and 52a to store heat in the heat storage body by heat transfer. By the way, since exhaust gas is high temperature, it tends to rise by buoyancy in the heat storage chamber. Accordingly, in the first heat storage chamber 51, exhaust gas accumulates from above, and transfer to the second heat storage chamber 52 starts when the exhaust gas accumulates to a position lower than the upper end of the opening of the flow passage 55.

Although the temperature of the exhaust gas introduced into the second heat storage chamber 52 is lowered due to contact with the first heat storage body 51a, it is still high temperature, so that it immediately moves to the second heat storage chamber 52. When it rises and reaches the vicinity of the ceiling of the second heat storage chamber 52, it is discharged as it is through the connection duct 54.

At this time, since the exhaust gas starts to move upward at the moment when the exhaust gas moves from the first heat storage chamber 51 to the second heat storage chamber 52, the first heat storage chamber 51 among the second heat storage chambers 52. Circulate the side upwards. Therefore, it does not circulate so much near the connection duct 54 away from the circulation port 55 on the opposite side.

On the other hand, when the combustion air is introduced into the glass melting furnace, the combustion air is taken into the second heat storage chamber 52 from the external atmosphere via the connection duct 54. At this time, contrary to the above, the combustion air is at a normal temperature at the beginning of introduction, and when it is taken into the second heat storage chamber 52, it tends to drop immediately. Therefore, in the second heat storage chamber, the combustion air flows downward near the connection duct 54, but does not flow much near the first heat storage chamber 51.

Therefore, in the second heat storage chamber 52, there is a drift that separates a portion where the exhaust gas exclusively circulates and a portion where the combustion air exclusively circulates. Due to this drift, there is a problem that the stored heat cannot be used efficiently and the energy efficiency is not improved as expected.

Further, when the flow path of the exhaust gas and the combustion air has shifted as described above, in the second heat storage chamber 52, the temperature on the first heat storage chamber 51 side through which the exhaust gas flows is likely to be high, The temperature on the side of the connection duct 54 through which the combustion air flows tends to be low. In this case, a temperature distribution occurs in the heat storage body 52a.

At this time, sodium sulfate (Na ₂ SO ₄ ) is precipitated from sodium ions and sulfate ions contained in the exhaust gas at a portion where the temperature is 880 ° C. or lower, and adheres to the heat storage member and precipitates, thereby The flow path may be blocked. Further, the precipitated sodium sulfate induces embrittlement of the heat storage body 52a. Therefore, it is preferable in terms of the furnace material structure to reduce the precipitation range of the sodium sulfate

heat storage bodies

51a and 52a. However, since a high temperature region of 880 ° C. or higher is generated in a wide range in the heat storage body 52a on the heat storage chamber 51 side, this sodium sulfate precipitation region is wide.

When the heat storage body becomes brittle (the heat storage member becomes brittle) in this way, the heat storage capacity of the portion decreases, and the embrittled heat storage member cannot maintain its layered structure, causing the heat storage body itself to collapse. In some cases, the heat cannot be held at a predetermined arrangement position and the heat storage function itself cannot be achieved.

Therefore, the present invention has been made to solve these problems, and can efficiently store heat in the heat storage body by the exhaust gas and heat the combustion air by the heat storage body. An object is to provide a heat storage device that prevents deterioration and has a long service life.

In the heat storage device of the present invention, a connection port for connecting to a glass melting kiln is provided above, a first heat storage chamber in which a heat storage body is disposed, an adjoining first heat storage chamber, and an external atmosphere Is connected to the second heat storage chamber, the first heat storage chamber and the second heat storage chamber are connected to each other below. And a cross-sectional area (S1) in the plane cross section of the first heat storage chamber and a cross-sectional area (S2) in the plane cross section of the second heat storage chamber. (S2 / S1) is 0.2 to 0.62.

The glass melting apparatus of the present invention includes a glass melting furnace and a pair of heat storage apparatuses of the present invention connected to the glass melting furnace and capable of alternately circulating combustion air and exhaust gas. And

The method for producing a glass article of the present invention uses the glass melting apparatus of the present invention, and the glass raw material in the glass melting furnace while the combustion air and the exhaust gas are alternately circulated by the pair of heat storage devices. It melt | dissolves and the glass raw material which melt | dissolved is solidified by cooling, It is characterized by the above-mentioned.

According to the heat storage device of the present invention, the heat storage to the heat storage body by the exhaust gas and the combustion air by the heat storage body can be efficiently performed, and the deterioration of the heat storage body can be suppressed to suppress the deterioration of the heat storage device itself. The service life can be improved.

According to the glass melting apparatus and the glass article manufacturing method of the present invention, since the heat storage apparatus is used, the heat storage and heating can be efficiently performed, and the energy used in glass melting and glass article manufacturing is further reduced. it can.

It is a sectional side view of the heat storage apparatus which is one Embodiment of this invention. It is AA sectional drawing in the thermal storage apparatus of FIG. It is a sectional side view of the connection duct which provided the damper. It is side sectional drawing of the other connection duct which provided the damper. It is the side view which showed an example of the laminated structure of a thermal storage body. It is the side view which showed the other example of the laminated structure of a thermal storage body. It is the side view which showed an example of the shape of a thermal storage member. It is a front view of the heat storage member of FIG. 5A. It is the side view which showed the other example of the shape of a thermal storage member. It is a front view of the heat storage member of FIG. 5C. It is a graph which shows the relationship between the production amount and fuel basic unit in an Example. It is a sectional side view of the heat storage apparatus which is one conventional embodiment.

Hereinafter, the present invention will be described in detail.
<Heat storage device>
The heat storage device according to the present invention is used in connection with a glass melting kiln as in the case of conventionally used heat storage devices, and allows combustion air and exhaust gas to flow alternately. This heat storage device stores the heat of the high-temperature exhaust gas in the heat storage body when circulating the exhaust gas from the glass melting furnace to the external atmosphere, and then stores the heat when circulating the combustion air from the external atmosphere to the glass melting furnace. The combustion air can be heated by the generated heat.

By alternately performing the flow of this exhaust gas and the flow of combustion air, heat storage and heat dissipation can be repeatedly performed by the heat storage body provided in the heat storage device, and heat energy can be used efficiently. Thereby, the combustion operation in the glass melting furnace can be efficiently performed at low cost.

FIG. 1 shows a schematic configuration of a heat storage device according to an embodiment of the present invention. The heat storage device 10 shown in FIG. 1 includes a first heat storage chamber 11, a second heat storage chamber 12, a connection port 13 for connecting to a glass melting furnace provided in the first heat storage chamber 11, It has a connection duct 14 for connecting to an external atmosphere provided in the second heat storage chamber 12, and a flow passage 15 connecting the first heat storage chamber 11 and the second heat storage chamber 12. ing. Hereafter, each element which comprises one Embodiment of this invention is demonstrated in detail.

The first heat storage chamber 11 is a space in which the heat storage body 11a is disposed, and the gas flowing through the first heat storage chamber 11 is partitioned so as to come into contact with the heat storage body 11a. That is, the first heat storage chamber 11 is provided so as to circulate the combustion air and the exhaust gas as described above, and the internal space serves as a flow passage, and combustion that passes through the first heat storage chamber 11 is performed. When the working air and the exhaust gas pass through the first heat storage chamber 11, they come into contact with the heat storage body 11a and can exchange heat.

Therefore, the heat storage body 11a is provided transversely in a direction perpendicular to the flow direction of the gas flowing through the first heat storage chamber 11, and heat is generated so that most of the flowing gas is in contact with the heat storage body 11a. The exchange can be performed efficiently.

In addition, the first heat storage chamber 11 is provided with a connection port 13 as a connection port for connection to the glass melting furnace. The connection port 13 connects the first heat storage chamber 11 and the inside of the glass melting kiln. The movement of exhaust gas from the glass melting kiln into the first heat storage chamber 11, from the inside of the first heat storage chamber 11. It is an opening that allows the movement of heated combustion air to the glass melting furnace.

The connection port 13 is provided above the first heat storage chamber. Here, “upward” means that the first heat storage chamber 11 is at a position higher than the heat storage body 11 a disposed inside the first heat storage chamber 11, for example.
Furthermore, the arrangement position of the connection port 13 is preferably a position close to the ceiling of the first heat storage chamber 11 or the ceiling so that the gas to be circulated does not stay in the first heat storage chamber 11.

The second heat storage chamber 12 is a space in which the heat storage body 12a is disposed, and the gas flowing through the second heat storage chamber 12 is partitioned so as to come into contact with the heat storage body 12a. That is, the second heat storage chamber 12 is provided so as to circulate the combustion air and the exhaust gas as described above, and the internal space serves as a flow passage, and the combustion that passes through the second heat storage chamber 12 is performed. When the working air and the exhaust gas pass through the first heat storage chamber 12, they come into contact with the heat storage body 12a and can exchange heat.

Therefore, the heat storage body 12a is provided transversely in a direction perpendicular to the flow direction of the gas flowing through the second heat storage chamber 12, and heat is generated so that most of the flowing gas is in contact with the heat storage body 12a. The exchange can be performed efficiently.

In addition, the second heat storage chamber 12 is provided with a connection duct 14 as a connection port for connection to the external atmosphere. The connection duct 14 connects the second heat storage chamber 12 and the external atmosphere, and movement of combustion air from the external atmosphere into the second heat storage chamber 12 and from the second heat storage chamber 12 to the external atmosphere. It is an opening that enables movement of exhaust gas.

The connection duct 14 is provided above the second heat storage chamber 12. Here, the upper direction may be a position higher in the second heat storage chamber 12 than, for example, the heat storage body 12a disposed in the second heat storage chamber 12. Furthermore, the arrangement position of the connection duct 14 is preferably close to the ceiling of the side wall of the second heat storage chamber 12 so that the gas to be circulated does not stay inside the second heat storage chamber 12, and may be provided on the ceiling. When provided on the ceiling, it may be provided in a chimney shape so that the flow path is formed in the vertical direction.

The above-described

heat storage bodies

11a and 12a are not particularly limited as long as they are conventionally known heat storage bodies used in a heat storage device of a glass melting furnace. The

heat storage bodies

11a and 12a are generally formed by stacking heat storage members such as heat storage bricks (checker bricks). In the lamination, the gaps between the heat storage bricks are adjusted and stacked so that the gas can flow therethrough (in order to increase the heat storage efficiency). At this time, typically, heat storage bricks are stacked and arranged so as to be arranged in a lattice pattern, and a plurality of such lattice-like arrays are stacked. At this time, in general, the directions are alternately stacked depending on the number of stages, and the positions of the odd and even stages are different. The heat storage bodies stacked in this way are stacked in a lattice shape when viewed from the front (side surface) and the plane, thereby forming a heat storage body. However, the stacking method is not particularly limited as long as the heat storage function can be exhibited.

As the heat storage bricks used here, those having high temperature and alkali resistance are used, and basic bonded bricks, alumina or alumina / zirconia / silica (AZS) electroformed bricks, and the like can be mentioned. The electroformed brick can be used at any part as a whole in the heat storage chamber, but in the case of a bonded brick, it is preferable to select the material as follows according to the use part in the heat storage chamber.

In the upper region of the heat storage body 11a formed in the first heat storage chamber 11, it is preferable to use high-purity alumina or magnesia-bonded bricks because the glass raw material powder is scattered particularly at high temperatures.

In the middle region of the heat storage element 11a, it is preferable to use spinel bricks, magnesia bricks, or the like that are resistant to deterioration caused by precipitation of bow crystals. In the lower stage region of the heat storage body 11a, it is necessary to use a clay brick or magnesia brick having a dense and low porosity because it needs strength to support the weight of the upper and middle heat storage bodies.

Further, in the lower region of the heat storage body 12a formed in the second heat storage chamber 12, the strength to support the weight of the upper and middle heat storage members is similar to the lower region of the heat storage body 11a in the first heat storage chamber. Since it is necessary, it is preferable to use clay bricks or magnesia bricks which are dense and have low porosity.

In the middle to upper stage of the second heat storage chamber 12, it is preferable to use ordinary clay bricks or clay bricks with low porosity.

Further, the heat storage body 11a formed in the first heat storage chamber is preferably obtained by stacking heat storage bricks in a lattice shape. At this time, it is preferable that bricks having a thickness of 30 to 60 mm are laminated, and each opening portion serving as a gas flow path is partitioned so as to be 140 to 160 mm square. Generally, bricks such as a square shape or a cross shape are used.

Although the shape of the heat storage body 12a formed in the second heat storage chamber is different from that of the heat storage brick used in the first heat storage chamber, there is a glass flow path and a brick portion when viewed in plan. Are preferably obtained by laminating so that the opening serving as a gas flow path is 140 to 190 mm and the brick thickness is 30 to 90 mm (preferably 60 to 90 mm).
In addition, the heat storage body 12a of the second heat storage chamber can be further arranged in a stacked manner as will be described later with reference to FIGS. 4A and 4B.

Further, the first heat storage chamber 11 and the second heat storage chamber 12 are connected to each other by a flow passage 15 provided below. The flow passage 15 is an opening that allows gas to flow from the first heat storage chamber 11 to the second heat storage chamber 12 and from the second heat storage chamber 12 to the first heat storage chamber 11.

The flow passage 15 is provided below both the first heat storage chamber 11 and the second heat storage chamber 12. Here, in the first heat storage chamber 11 and the second heat storage chamber 12, for example, the lower position may be a position lower than the

heat storage bodies

11a and 12a disposed inside the respective heat storage chambers. Furthermore, the arrangement position of the flow passage 15 is preferably a position close to the bottom surface of each heat storage chamber so that the gas to be circulated does not stay inside the first heat storage chamber 11 and the second heat storage chamber 12. Here, the flow path 15 is not particularly limited as long as it has a size that allows gas to smoothly flow between the first heat storage chamber 11 and the second heat storage chamber 12.

As described above, the connection port 13 and the connection duct 14 are provided upward, and the flow passage 15 is provided downward. Therefore, for example, the exhaust gas is introduced from the glass melting furnace to the upper side of the first heat storage chamber 11, moves downward while contacting the inside of the first heat storage chamber 11 with the heat storage body 11 a, and passes through the flow passage 15. Move to the second heat storage chamber 12. Further, the exhaust gas that has moved to the second heat storage chamber 12 moves upward while contacting the inside of the second heat storage chamber 12 with the heat storage body 12a, and is discharged from the connection duct 14 to the external atmosphere.

The heat storage device 10 is characterized in that the first heat storage chamber 11 and the second heat storage chamber 12 have a predetermined relationship. FIG. 2 is a cross-sectional view taken along the line AA of the heat storage device 10 shown in FIG. 1. In FIG. 2, the area of the first heat storage chamber 11 in the plane cross section is S1, and the second heat storage chamber 12 is flat. The area of the cross section is S2. Here, in one embodiment of the present invention, the ratio (S2 / S1) of the area S2 to the area S1 is 0.2 to 0.62, preferably 0.3 to 0.58, More preferably, it is 3 to 0.52. In FIG. 2, the area S1 is represented by a hatched pattern, and the area S2 is represented by a hatched pattern.

By setting this ratio (S2 / S1) to 0.62 or less, it is possible to suppress a decrease in efficiency of heat exchange due to drift, which has been a problem in the past, and to improve the utilization efficiency of heat energy. That is, by overlapping the exhaust gas flow path and the combustion air flow path in the second heat storage chamber 12, the efficiency of heat utilization by heat storage can be improved. Furthermore, this makes it possible to suppress embrittlement of the heat storage body and extend the life of the apparatus.

In addition, by setting the ratio (S2 / S1) to 0.2 or more, the first heat storage chamber 11 is changed to the second heat storage chamber 12, and the second heat storage chamber 12 is changed to the first heat storage chamber 11. It is possible to suppress the amount of change in the flow rate of gas that can be circulated to a good range, prevent damage to the heat storage body due to the gas flow rate becoming too fast, or reduce wear, The circulation of the gas in the heat storage device can be made smooth.

In general, the

heat storage bodies

11a and 12a are formed in the first heat storage chamber 11 and the second heat storage chamber 12 so as to be disposed in the entire area of the flat cross section (transverse cross section of the flow path), respectively. The area ratio is the same as the area where the

heat storage elements

11a and 12a are formed.

Further, as shown in FIG. 2, the vertical (depth) in the flat section of the first heat storage chamber is L1, the horizontal (width) is W1, and the vertical (depth) in the flat section of the second heat storage chamber is L2. When (width) is W2, the aspect ratio (L2 / W2) of the second heat storage chamber is preferably 0.3 to 0.7. By setting it as such an aspect ratio, the combustion air and exhaust gas which distribute | circulate the 2nd thermal storage chamber 14 can be distribute | circulated smoothly, and the above-mentioned heat storage by exhaust gas and the heating of combustion air can be made more efficient, respectively. .

Further, the opening area (S3) of the flow passage 15 is preferably such that the ratio (S3 / S1) to the area (S1) of the flat cross section of the first heat storage chamber 11 is 0.1 to 0.4. By setting this ratio (S3 / S1) to 0.4 or less, when exhaust gas moves from the first heat storage chamber 11 to the second heat storage chamber 12, the flow velocity passing through the flow passage 15 can be increased. The exhaust gas can be delivered to the heat storage body 12a (the heat storage body 12a on the connection duct 14 side) away from the flow passage 15. Further, by setting the ratio (S3 / S1) to 0.1 or more, the flow rate of the exhaust gas passing through the flow passage 15 does not become too high, and the exhaust gas can be brought into contact with the entire heat storage body 12a. That is, it is possible to suppress a drift in which the exhaust gas mainly contacts the heat storage body 12a near the first heat storage chamber 11.

Further, the opening upper end portion 15a of the flow passage 15 is preferably provided at a position 50 to 100 cm lower than the lower end of the heat storage body 12a disposed in the second heat storage chamber 12, and is 80 to 100 cm lower. Is more preferable.
Further, the opening upper end portion 15a of the flow passage 15 is preferably provided 50 to 150 cm above the floor surface of the second heat storage chamber 12 and more preferably 80 to 120 cm above.

When the distance from the floor surface of the second heat storage chamber 12 to the lower end of the heat storage body 12a is H1 (see FIG. 1), the opening upper end portion 15a of the flow passage 15 is the floor surface of the second heat storage chamber 12. Therefore, it is preferably provided at a position lower than 2/3 of H1, and more preferably provided at a position lower than 1/2.
As a result, the exhaust gas that has moved from the first heat storage chamber 11 to the second heat storage chamber 12 can be slightly delayed until it contacts the heat storage body 12a, and the exhaust gas that has flowed into the second heat storage chamber 12 thereby. Since this is diffused, this is also one method of suppressing drift.

Moreover, a step may be provided between the floor surface of the first heat storage chamber 11 and the floor surface of the second heat storage chamber 12. At this time, the floor surface of the second heat storage chamber 12 is preferably 15 to 50 cm higher than the floor surface of the first heat storage chamber 11, and more preferably 20 to 30 cm higher. In addition, when there is a step on the floor surface, the opening area (S3) of the flow passage 15 flows through the higher floor surface of the floor surface of the first heat storage chamber 11 and the floor surface of the second heat storage chamber 12. An opening is defined as the lower surface of the.

<Glass melting device>
The glass melting apparatus of one Embodiment of this invention has a glass melting kiln and a pair of said heat storage apparatus connected with this glass melting kiln. As the glass melting furnace used here, a conventionally known glass melting furnace is used and is not particularly limited.

Further, the heat storage device used here is the heat storage device of the present invention, for example, the heat storage device described above. This heat storage device is capable of alternately circulating combustion air and exhaust gas, and is further provided as a pair with respect to the glass melting furnace. When the combustion air is circulated through one of the pair of heat storage devices, the atmosphere in the glass melting furnace can always be combusted by allowing the exhaust gas to circulate through the other. Thereby, the high temperature state can be stably maintained in the glass melting furnace.

<Method for producing glass article>
The glass article manufacturing method of the present invention is characterized in that a glass article is manufactured using the glass melting apparatus.

In this method for producing a glass article, the glass raw material is melted in a glass melting furnace by the same operation as a conventionally known method, and the melted glass raw material is solidified by cooling to obtain a glass article. At this time, the point which uses the said glass melting apparatus as a glass melting apparatus is the characteristics.

That is, first, combustion air and fuel are introduced into the glass melting kiln of the glass melting apparatus, and are burned to heat the glass melting kiln to a desired temperature. While maintaining the inside of the glass melting furnace at a predetermined temperature, the glass raw material is sufficiently melted by a known method, and the melted glass raw material is transferred from the glass melting furnace, cooled and solidified, and glass having a desired shape. Manufacture articles.

In the production of this glass article, the pair of heat storage devices is used to maintain the temperature in the glass melting furnace at a high temperature so that the glass raw material remains in a molten state. That is, exhaust gas generated by combustion in the glass melting furnace is circulated to one heat storage device and discharged to the external atmosphere, and simultaneously, combustion air is circulated from the external atmosphere to the other heat storage device, Combustion air is introduced into the glass melting furnace. The combustion air introduced here is mixed with fuel and burned in a glass melting furnace so that a predetermined high temperature state can be maintained.

After performing this flow for a predetermined time, this time, the gas to be circulated in each heat storage device and the gas distribution direction are changed. That is, the combustion gas is circulated in the heat storage device in which the exhaust gas is circulated, and the exhaust gas is circulated in the heat storage device in which the combustion gas is circulated. The operation of alternately changing the gas to be circulated and the gas flow direction at a predetermined timing is repeated. Thereby, the inside of a glass melting furnace can always maintain a desired high temperature state.

By performing this operation, when the high-temperature exhaust gas and the heat storage body come into contact with each other, heat is stored in the heat storage body by heat transfer, and then when the combustion air is brought into contact with the heat storage body thus stored, the heat transfer causes room temperature. The combustion air is heated. This heat transfer is performed in the first heat storage chamber 11 and the second heat storage chamber 12.

In this way, exhaust heat of exhaust gas is used for heating combustion air via the

heat storage bodies

11a, 12a, so that heat energy can be effectively used to save energy and reduce costs in the manufacture of glass articles. Can be achieved.

(Modification of heat storage device)
Moreover, the above-described heat storage device can be configured as described below.
As shown in FIGS. 3A and 3B, the connection duct 14 may be provided with a damper 21 that can change the flow direction of the combustion air. The damper 21 is provided near the connection port between the second heat storage chamber 12 and the connection duct 14. The damper 21 only needs to be able to change the flow direction (take-in direction) of the combustion air when taking the combustion air into the second heat storage chamber 12 from the connection duct 14.

For example, the damper 21 shown in FIG. 3A is a plate-like member that is fixed at the center so that both ends can move up and down, and the combustion air that is fed into the second heat storage chamber depending on the orientation of the plate-like member The direction of changes. When combustion air is taken in from the connecting duct 14 in a diagonally downward direction, the heat storage body 12a disposed inside the second heat storage chamber 12 contacts the heat storage body near the connection port of the connection duct 14 and moves downward. When the combustion air is circulated and taken in from the connection duct 14 in an obliquely upward direction, it contacts the heat storage body that is distant from the connection port of the connection duct 14 among the heat storage bodies 12a disposed inside the second heat storage chamber 12. Then it comes to circulate downward.

Thus, by changing the flow direction when the combustion air is taken into the second heat storage chamber 12, the flow path of the combustion air can be prevented from being unevenly distributed, and the temperature of the heat storage body can be made uniform.

FIG. 3B shows an example in which the connection duct 14 is provided on the ceiling of the second heat storage chamber 12. It is preferable to provide the connection duct 14 on the ceiling in this way because the plane position where the combustion air is taken in can be arbitrarily set. For example, it can be provided according to the strength of the upward flow of exhaust gas. 3B, a damper 21 is provided as in FIG. 3A. At this time, the damper 21 is a plate-like member whose center is fixed so that both ends can be moved in the horizontal direction. The direction of the combustion air sent into the second heat storage chamber 12 changes depending on the direction of the member.

Therefore, when combustion air is taken in from the connection duct 14 toward the first heat storage chamber 11, the heat storage body near the first heat storage chamber 11 among the heat storage bodies 12 a arranged inside the second heat storage chamber 12. When the combustion air is taken in to the side away from the first heat storage chamber 11 of the connection duct 14, the first of the heat storage bodies arranged in the second heat storage chamber 12. It comes to distribute | circulate below, contacting the thermal storage body of the side away from the 1 thermal storage chamber 11. FIG.

Thus, by changing the flow direction when the combustion air is taken into the second heat storage chamber 12, the temperature of the heat storage body can be made uniform without uneven distribution of the flow path of the combustion air.

Next, the laminated structure of the heat storage member of the heat storage body 12a will be described.

The above-described heat storage body 12a is stacked so that heat can be stored by circulating a high-temperature gas and then heat can be dissipated by circulating a low-temperature gas, and is generally stacked in a lattice shape when viewed from the side. (FIG. 4A). FIG. 4A schematically shows a configuration example in the case where a rectangular parallelepiped heat-resistant brick is used as the heat storage member and the heat storage members are stacked in 13 stages. In FIG. 4A, the odd-numbered heat storage member is shown as 121a and the even-numbered heat storage member is shown as 121b. However, the heat storage member 121a and the heat storage member 121b are the same heat storage member.

Further, as another stacked structure of the heat storage member, as shown in FIG. 4B, the heat storage member may be stacked in a staggered arrangement in which the stacked positions of the heat storage members are staggered. Note that the staggered arrangement is divided into odd and even stages. In other words, the stacking positions in a certain odd-numbered stage are in a state of being stacked alternately so as not to overlap when viewed in plan with the stacking positions of the adjacent odd-numbered stages (± 2 stages in terms of the number of stages). .

In the case of staggered arrangement, at least one of the arrangement positions of the heat storage members in the odd stages and the arrangement positions of the heat storage members in the even stages may be the staggered arrangement. At this time, in the outer peripheral portion of the heat storage body 12a, it is preferable that the arrangement positions of the outer surfaces are aligned in consideration of the strength of the laminated structure and the like.

Like this staggered arrangement, by shifting the arrangement position of the heat storage member in plan view, the length of the flow path through which the circulating gas circulates inside the heat storage body can be lengthened, and the heat transfer of heat storage and heat dissipation is efficient. Can be done. For example, an example of the main flow of the exhaust gas in the heat storage body 12a shown in FIGS. 4A and 4B is indicated by a broken line. In FIG. 4A, the flow path fl1 is linearly formed in the vertical direction as it is, but in FIG. 4B, the flow path fl2 is blocked by the upper heat storage member and cannot be formed in a straight line. It is formed. Therefore, the flow path in the exhaust gas heat storage body 12a can be lengthened, and the chance of heat storage can be increased accordingly, and the efficiency of heat transfer can be improved.

In addition, in FIG. 4B, the flow path fl2 is simply shown, and it does not actually have a beautiful wave shape. That is, branching is caused by a collision with a heat storage member, and further branching by a collision with an upper heat storage member. It becomes complicated.

In addition, the staggered portion may be a part of the heat storage body. However, when it is provided, it is preferable that the arrangement pattern is repeated in the vertical direction so that the flow path length can be increased.

Although the alternate arrangement has been described above, the arrangement is not limited to this as long as the flow path length can be increased. That is, this arrangement is a structure in which the heat storage members are alternately stacked in the odd-numbered stage or the even-numbered stage. In other words, this is a stage one level higher than the arrangement of the heat storage member in the starting stage ( When the odd and even numbers are combined, the arrangement of the upper two stages is actually the middle of the pitch between the heat storage members in the starting stage (the arrangement position when viewed in plan), and the upper two stages (the odd and even stages) In total, the arrangement of the upper four stages) is the same as the heat storage member in the starting stage (arrangement position when viewed in plan). Furthermore, the arrangement of the upper three stages (if the odd and even numbers are combined, the actual upper six stages) is the same as the upper one (arrangement position when viewed in plan). The subsequent arrangement is repeated thereafter. That is, it can be said that this is a laminated structure in which layers are repeatedly laminated at a cycle of two stages.

In the present embodiment, a repeating structure may be provided with a period of three or more stages, for example, a period of 3 to 20 stages, in addition to repeated lamination with a period of two stages. At this time, as a method of forming a cycle, the cycle may be provided in a step shape, or the cycle may be provided in a wave shape. Here, for example, in the case of providing a staircase with a period of three steps, the odd-numbered first step, the odd-numbered second step, and the odd-numbered third step are overlapped when viewed in plan. An example is provided in which the fourth step of the odd number is the same as the first step, the fifth step is the same as the second step, and the sixth step is the same as the third step.

In addition, as a structure similar to the structure provided in a stepped manner with the period of three steps, the first to third steps are the same as the above, but the fourth step is the same as the second step, and the fifth step is the first step. In this example, the fifth and subsequent steps are provided in a wave shape that repeats the first to fourth steps. In this case, the repeating unit is four stages.

In addition, the heat storage member constituting the heat storage body may generally be a rectangular parallelepiped heat storage member. For example, as shown in FIGS. 5A and 5B, the upper width is narrow on the side surface and the lower width is wide. You may use the thermal storage member which has such an inclination. If the heat storage member having such a shape is used, the heat storage member can be easily cleaned. That is, when a glass article is manufactured using the above-described heat storage device, combustion debris generated by combustion in the exhaust gas, compounds contained in the exhaust gas, and the like adhere to the heat storage member as dust. Such deposits increase according to the usage time, and the gas flow path becomes too narrow after a long period of use and eventually becomes blocked, and the heat storage device may not function sufficiently.

In order not to cause such a situation, if a heat storage member having an inclination on the side surface as described above is used, accumulation of dust on the heat storage member itself can be suppressed. In addition, there is a case where such dust is maintained by regular cleaning. In this case, a cleaning tool is usually used from the dust connected to the second heat storage chamber or an openable cleaning window provided in the middle. And let the dust fall to the bottom of the second heat storage chamber. In this cleaning, since it is usually inserted from the top to the bottom, it is advantageous in terms of ease of cleaning.

Further, as shown in FIGS. 5C and 5D, the heat storage member is a heat storage member having an inclination in which the upper width is narrow and the lower width is wide in the side cross section, but the heat storage member has no partial inclination. It is good also as a member. The heat storage member in FIGS. 5C and 5D is a heat storage brick having a special shape in which there is no inclination at both ends and the central part in the width direction (the depth is the same in the height direction), and an inclination is provided between the two. By setting it as such a shape, the intensity | strength of a thermal storage member is securable, preventing accumulation of dust. When using this heat storage member, it is preferable to laminate a portion having no inclination with another heat storage member.

Hereinafter, the present invention will be specifically described with reference to Examples and Comparative Examples, but the present invention is not limited to these descriptions.

(Examples 1 and 2)
A glass melting apparatus provided with a heat storage device having a first heat storage chamber and a second heat storage chamber having the configuration shown in FIG. 1 in a glass melting furnace via a connection port was obtained. Table 1 shows the relationship between the parameters in these heat storage devices. Here, the glass melting kiln having a predetermined production amount in each example shown in Table 2 was used.

(Comparative Examples 1 and 2)
The glass melting apparatus which provided the thermal storage apparatus which has the 1st thermal storage chamber of the structure shown in FIG. 7 and the 2nd thermal storage chamber via the connection port in the glass melting kiln of each example predetermined production amount shown in Table 2 Got. The relationship of each parameter in these heat storage devices is shown together in Table 1.

(Comparative Examples 3 to 4)
Glass melting provided with a heat storage device having a first heat storage chamber (a single-pass one having no second heat storage chamber) via a connection port in a glass melting kiln having a predetermined production amount shown in Table 2 Got the device.

Note that the connection positions of the connection ducts in the second heat storage chamber are up (ceiling) in Examples 1 and 2, and side (upward) in Comparative Examples 1 and 2.
Using the glass melting apparatus obtained in Examples 1 and 2 and Comparative Examples 1 to 4, glass materials were melted to produce glass articles. Table 1 shows the relationship of each parameter in the heat storage devices of Examples 1 and 2 and Comparative Examples 1 and 2. At this time, the fuel intensity per unit production amount was calculated from the relationship between the production amount of the glass melting kiln and the fuel used in each example, and are shown in Table 2 and FIG.

As can be seen from Table 2 and FIG. 6, in the glass melting apparatuses of Comparative Examples 1 to 4, as the production volume increases and the size increases, the efficiency improves and the fuel consumption rate (y) can be reduced. When the fuel intensity of the comparative example is x (Pull (T / Day) which is the production amount per day) and y is the fuel intensity (GJ / T) which is the fuel necessary to melt 1 ton of glass, It can be approximated by the following equation (1).

y = 9.5038x ^-0.16 (1)

On the other hand, it can be seen that the glass melting apparatuses of Examples 1 and 2 are superior to the comparative example in the fuel consumption rate at the same production amount (x1). At this time, it can be said that the fuel consumption rate of the example is 5% or more lower than the approximate line of the comparative example.

From the above results, if S2 / S1 is 0.62 or less as in the embodiment as a relationship between the first heat storage chamber and the second heat storage chamber, the fuel at the same production amount (x1) as compared with the comparative example. The basic unit tends to improve. Similarly, the aspect ratio (L2 / W2) in the plane section of the second heat storage chamber is 0.3 to 0.7, and the cross-sectional area (S1) of the first heat storage chamber and the opening area (S3) of the flow passage are When the ratio (S3 / S1) is 0.1 to 0.4, the fuel consumption rate at the same production amount (x1) tends to be improved as compared with the comparative example.
As described above, when the heat storage device according to one aspect of the present invention is used, even in a production facility with a relatively small production amount in which energy efficiency is likely to decrease, heat storage to the heat storage body by exhaust gas and combustion air by the heat storage body It is possible to achieve efficient heating. That is, it has been found that the heat storage device in the present embodiment has improved heat exchange efficiency and is useful for energy saving.

The present invention can be used as a heat storage device in melting of glass, and can be suitably used particularly for a glass production device that produces a small amount of various products with a relatively small production amount (pull). Further, the glass forming method after melting is a known method, for example, a sheet forming glass manufacturing method such as a float method, a down draw method, a fusion method, and a slot down method, as well as a press forming method and a press blow forming method. It can be used for glass production apparatuses such as blow-blow molding and casting. Moreover, although the composition of glass is applicable to a well-known glass composition, soda-lime glass can be applied especially suitably.

Claims

A connection port for connecting to the glass melting furnace is provided above, a first heat storage chamber in which a heat storage body is disposed,
A second heat storage chamber adjacent to the first heat storage chamber, provided with a connection duct for connecting to the external atmosphere, and having a heat storage body disposed therein;
A heat storage device for a glass melting kiln having a flow path connecting the first heat storage chamber and the second heat storage chamber below each other,
The ratio (S2 / S1) of the cross-sectional area (S2) in the flat cross section of the second heat storage chamber to the cross-sectional area (S1) in the flat cross section of the first heat storage chamber is 0.2 to 0.62. A heat storage device characterized by this.
The heat storage device according to claim 1, wherein an aspect ratio (L2 / W2) in a plane section of the second heat storage chamber is 0.3 to 0.7.
The heat storage device according to claim 1 or 2, wherein a ratio (S3 / S1) of an opening area (S3) of the flow passage to a cross-sectional area (S1) of the first heat storage chamber is 0.1 to 0.4. .
The heat storage device according to any one of claims 1 to 3, wherein an upper end portion of the flow passage is provided 50 to 100 cm lower in a vertical direction than a lower end of the heat storage body of the second heat storage chamber.
The heat storage device according to any one of claims 1 to 4, wherein an upper end portion of the flow path is provided 15 to 50 cm above the floor surface of the second heat storage chamber in the vertical direction.
The heat storage device according to any one of claims 1 to 5, wherein a damper is provided in the connection duct.
The heat storage device according to any one of claims 1 to 6, wherein the connection duct is connected to an upper surface of the second heat storage chamber.
The heat storage body is provided with a heat storage member laminated therein so that gas can flow therethrough,
The heat storage device according to any one of claims 1 to 7, wherein the heat storage members in the second heat storage chamber are stacked in a lattice shape.
The heat storage body is provided with a heat storage member laminated therein so that gas can flow therethrough,
The heat storage body in the second heat storage chamber is laminated so that the arrangement position in a plan view does not overlap with the even-numbered stage and / or the odd-numbered stage of the heat storage member in the even-numbered stage and / or odd-numbered stage. The heat storage device according to claim 8.
The heat storage device according to claim 9, wherein the heat storage members of the even-numbered stages and / or the odd-numbered stages of the heat storage bodies are stacked so as to have a staggered arrangement in a side view.
10. The heat storage device according to claim 9, wherein the heat storage members of the even-numbered stages and / or odd-numbered stages of the heat storage body are laminated by repeating a pattern in a stepped shape or a wave shape with a period of 3 to 20 steps in a side view.
The heat storage device according to any one of claims 1 to 11, wherein a cross section of the heat storage member constituting the heat storage body has a trapezoidal shape.
A glass melting furnace,
A pair of heat storage devices according to any one of claims 1 to 12, which are connected to the glass melting furnace and allow a combustion air and an exhaust gas to flow alternately.
A glass melting apparatus comprising:
The glass raw material which melt | dissolved and melt | dissolved the glass raw material in the said glass melting kiln, using the glass melting apparatus of Claim 13, and making the said combustion air and the said exhaust gas distribute | circulate alternately by a pair of said heat storage apparatus. The glass article is solidified by cooling to obtain a glass article.