JPH11211371A - Thermal storage materials-holding structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate occurrence of a gap between a thermal storage material and a housing for containing the material by disposing a filler having a flowability at a high temperature and being fixable or highly sticky at a low temperature between the housing and the material. SOLUTION: A thermal storage material 2 is charged in a media container 5 of a thermal storage material 3. And, a filler 7 is associated with a gap between the material 2 and the container 6 of a housing therearound. The filler 7 has a suitable flowability at a high temperature and is solidified or highly sticky at a low temperature. As the filler 7, for example, an adhesive, a binder, a hardener, a heat resistant adhesive containing a filler or the like, etc., can be used. Specifically, as the filler, an alkali metal silicate such as a water glass, a potassium silicate or the like, a phosphate such as a metal phosphate added with an inorganic filler or the like, or heat resistant adhesive such as a colloidal silica or the like can be used. For example, the water glass, the potassium silicate or a mixture of them with other composition is preferably used.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for holding a heat storage body in a housing. More specifically, the present invention relates to a heat storage body holding structure suitable for holding a heat storage body, particularly a honeycomb-shaped or tubular heat storage body having a large number of flow paths.

[0002] In the present specification, the term "housing" refers to any material that accommodates a heat storage material such as a metal casing, a wind box, a burner tile (burner throat), or a material that surrounds a heat storage material. Shall be included. In this specification, a regenerative burner that repeats a heat storage-radiation cycle at a high cycle within 60 seconds, preferably 20 to 30 seconds or shorter is referred to as a regenerative burner.

[0003]

2. Description of the Related Art In a conventional regenerative burner, a heat storage element (also referred to as a heat storage element) is housed in a tubular heat-resistant metal case and connected to the outside of the burner or provided inside the air throat. Have been. For example, in the case of a regenerative burner as shown in FIG. 7A, a heat storage element 102 is placed in a box-shaped metal casing (hereinafter referred to as a housing) 101 lined with a heat insulating material, and then a wind box having the same configuration is used. The wind box 103 is connected to the refractory burner tile 104 in such a manner as to abut against the burner tile 104. In this case, the heat storage body 10
If the heat storage body 102 is loaded without a gap between the housing 2 and the housing 101, the heat storage body 102 will be broken or cracked when thermally expanded, so that the heat storage body 102 cannot be loaded without a gap. On the other hand, if a gap is generated around the heat storage body 102, the pressure loss is much smaller than that of the flow path / cell hole in the heat storage body, so that the fluid passing therethrough becomes overwhelmingly large. For this reason, the temperature efficiency is reduced, and a large variation occurs in the flow rate of the fluid, and an extreme temperature difference occurs in the heat storage body (in the case of exhaust gas, a place where the flow rate is large is hot, and a place where the flow rate is small is relatively cold). Cracking due to thermal stress is caused.

Therefore, in order to allow a thermal expansion of the heat storage body 102 and to prevent a gap between the heat storage body 102 and the housing 101, a glass fiber 106 is wound around the heat storage body 102 so as to prevent the housing 1 from expanding.
01, and the gap between the heat storage body 102 and the housing 101 is filled with a glass fiber 106 and held. Further, when a heat storage body of a required size is constituted by a large number of block pieces, the block pieces are densely stacked by a skilled person in a housing lined with glass fibers.

Further, since a connecting portion 105 is formed between the burner tile 104 and the wind box 103, a seal is required. In addition, since the temperature of the part to be sealed is almost the same as that in the furnace, for example, about 1000 ° C. or higher, a high-temperature refractory sealing material must be used. In addition, a burner tile 10 made of a refractory
Because the coefficient of thermal expansion is different between the case 4 and the window box 103 whose metal shell is made of metal, it cannot be firmly connected by bolting or the like. Therefore, they are connected to such an extent that they are brought into contact with each other via a high-temperature sealing material such as a ceramic fiber fabric.
In some cases, as shown in FIG. 7B, the metal casing (hereinafter referred to as a housing) 101 ′ in which the heat storage body 102 around which the glass fiber 106 is wound is accommodated is simply installed by directly butting. . Reference numeral 105 'is a connecting portion.

[0006] Even with such a fixing method, in the conventional burner, the supply pressure of the combustion air is generally relatively low, so that the leakage of air does not become a serious problem.

[0007]

However, according to the heat storage body holding structure, the high temperature (about 1000 to 1300 ° C.) exhaust gas and the low temperature (about 20 to 30 ° C.) combustion air are alternately exposed in a short time. As the glass fiber 106 undergoes repeated expansion and contraction, the glass fiber 106 undergoes sagging due to aging, and the housing 101 around the heat storage body 102 when contracted.
To increase the flow (short path) of air or exhaust gas passing through the periphery of the heat storage body 102, causing a situation in which the heat storage body 102 is not sufficiently used, or causing a crack due to an extreme temperature difference. There is a possibility that it will be done. Therefore,
Frequent replacement of the glass fiber 106 and the heat storage body 102 is required, and maintenance is not easy.

Further, leaks at the connecting portions 105, 105 'between the burner tile 104 and the housings 101, 101', which have not been a problem so far, and a short path in the housing have emerged as extremely serious problems. . That is, as a result of the present inventors' research on NOx reduction,
High speed, for example, 60 m / s or more, preferably 100 to 120
It has been found that NOx can be rapidly reduced when supplying combustion air into the furnace at m / s. However, in order to increase the speed of combustion air, the supply pressure must be higher than before, but this promotes leakage at the seal portion and leakage of air and exhaust gas that slips around the heat storage body, which was not a problem in the past. It became a problem that could not be ignored.

It is an object of the present invention to provide a heat storage element holding structure capable of preventing or reducing the generation of a gap between the heat storage element and a housing for accommodating the heat storage element, and a heat storage element suitable for use therein. Aim. Another object of the present invention is to provide a heat storage body holding structure that does not leak when the heat storage body is attached to a burner.

[0010]

In order to achieve the above object, a first aspect of the present invention is to provide a structure for holding a heat storage body in a housing, which has an appropriate fluidity at a high temperature and solidifies or has high adhesion at a low temperature. The filler having the property is arranged between the housing and the heat storage body.

In this case, as the regenerator is exposed to the high-temperature exhaust gas and heated to a high temperature, the filler disposed between the regenerator and the housing also liquefies and exhibits an appropriate fluidity. Therefore, the heat storage body is freely movably connected to the housing without being restrained by the adhesive force of the filler, and the gap between the housing and the heat storage body is filled with the liquefied high-viscosity filler to be elastic. The heat storage body is held. On the other hand, at the time of cooling, as the heat storage body is exposed to low-temperature air and cooled, the filler disposed between the heat storage body and the housing also increases in viscosity and further solidifies. In addition, even in the process of cooling the heat storage element, the filler material follows the movement of the heat storage element without being hindered from moving due to the contraction of the heat storage element due to the adhesive force and fluidity of the filler. Therefore, the heat storage body is not excessively restrained, and the gap between the heat storage body and the housing is kept filled with the filler. That is, when the heat storage body expands and the gap between the housing and the housing narrows, the filler spreads, and when the gap widens, the filler gathers, and the two are fixed so that the gap between the housing and the heat storage material is always filled. You. As a result, while allowing free thermal expansion without restricting the heat storage body, it is possible to reduce the leakage of the fluid passing around the heat storage body and to allow the fluid to uniformly pass through the heat storage body.

According to a second aspect of the present invention, in the heat storage body holding structure according to the first aspect, any one of water glass, potassium silicate, and a mixture thereof with another composition is used as a filler. Like that. in this case,
For example, at a relatively low temperature of 400 ° C. or lower, a high viscosity is exhibited or solidified, so that the effect of fixing the housing and the heat storage element is high. Maintain a sufficient level of tackiness and fluidity. For example, even at a high temperature of 1200 to 1300 ° C., it has a viscosity of about tar at room temperature of about 1000 poise.

According to a third aspect of the present invention, in the heat storage body holding structure according to the first or second aspect, the filler is impregnated with the heat resistant reinforcing material and disposed. In this case, since the filler is reinforced by the heat-resistant reinforcing material and is always fixed to the surrounding heat storage body and the housing while expanding and contracting the heat-resistant reinforcing material, the heat storage body can be held more elastically and the filler itself can be held. , The leakage of fluid passing around the heat storage body is reduced, and the fluid can be uniformly passed through the heat storage body. Here, the heat-resistant reinforcing material is
It is preferable to use a glass fiber or a ceramic fiber having heat resistance at a use temperature, or a woven or nonwoven fabric thereof, or a woven or nonwoven fabric of a heat-resistant metal.

According to a fourth aspect of the present invention, in the heat storage body holding structure according to any one of the first to third aspects, a honeycomb-shaped rectangular heat storage material that forms a linear minimum flow path as the heat storage body. A block piece or a collection of thin tubular heat storage material block pieces is used.

According to a fifth aspect of the present invention, in the heat storage body holding structure according to any one of the first to third aspects, a fan-shaped honeycomb-shaped heat storage material block piece is joined as the heat storage body to form a cylindrical shape. I try to use what I did. In this case, it is possible to form a circular heat storage element having a size equal to or larger than the limit that can be manufactured by the ceramic honeycomb heat storage element.

According to a sixth aspect of the present invention, the housing in the heat storage body holding structure according to any one of the first to fifth aspects is arranged such that the housing is disposed in front of the media storage part for storing the heat storage body and the media storage portion. The heat storage case comprises an integrally molded cylindrical heat storage case having a narrowed portion for narrowing a path and a flange portion disposed at the rear, enabling a seal between a burner part or a furnace body at the flange portion, and a heat storage material. It is characterized by a cartridge type that can be attached to each case. In this case, the space between the heat storage case and the surrounding burner parts or furnace body is sealed at the low temperature portion at the rear end of the case, so that the low temperature sealing material provides a reliable seal. Further, in the heat storage body case in which the throttle portion and the media storage portion are integrally formed, there is no connecting portion between the throttle portion and the media storage portion. In addition, since the heat storage element can be incorporated into the heat storage case before mounting it on the burner without considering the removal of the heat storage element, the flow of air passing through the periphery of the heat storage element can be prevented. .
As a result, complete sealing can be achieved, the supply pressure of the combustion air can be increased, and the flow velocity of the combustion air can be increased.

Further, according to a seventh aspect of the present invention, in the heat storage body holding structure according to any one of the first to sixth aspects, the heat storage body has a suitable fluidity at a high temperature at least on a surface facing the housing. At low temperatures, a filler which solidifies or has high tackiness is applied in advance. In this case, the filler on the surface of the heat storage element is liquefied only by operating the regenerative burner after the heat storage element is loaded into the housing without any gap, and the filler is filled in the gap between the housing and the heat storage element by capillary action. Can be infiltrated and arranged at an appropriate position.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the present invention will be described below in detail based on an embodiment shown in the drawings.

FIG. 1 and FIG. 2 show an embodiment of a heat storage body holding structure according to the present invention. Incidentally, the regenerative burner in this embodiment is a combustion system constituted by a set of burners that alternately burns, and periodically switches between a burner that burns and a burner that stops burning, and the air throat of the stopped burner. The air is exhausted from the air throat, heat is recovered by a heat storage body provided in the air throat, and the recovered heat is used for preheating combustion air to be supplied at the next combustion. Although not shown, the regenerative burner system receives heat from one of the pair of burners, which is selectively connected to an air supply system or an exhaust system via a flow path switching device, while burning one of the pair of burners. Combustion gas that has been used for heating a heated object is exhausted. Therefore, except for the part relating to the heat storage body holding structure, the principle and configuration of the flow path switching means are publicly known and are not essential parts, and therefore detailed description thereof is omitted.

The heat storage material (also called a heat storage medium) 2 of each burner is previously incorporated in a heat storage material case 3 in which a throttle portion 4 and a media storage portion 5 are integrally formed as shown in FIG. It is inserted into the burner throat 9 of the burner tile 8. Then, the heat storage body case 3 is arranged such that the opening of the throttle portion 4 at the end thereof faces the burner throat 9. In the case of this embodiment, as shown in FIG. 1, the regenerator cartridge and the fuel nozzle 17 are assembled side by side on the burner tile 8 and are configured as one burner tile assembly 1. The burner tile assembly 1 is fitted and fixed to a burner mounting opening of the furnace body 13. Further, the heat storage cartridge and the burner tile 8 are formed by interposing a low-temperature sealing material 16 such as a rubber ring between the flange 6 at the rear end of the heat storage case 3 and the metal casing 12 of the burner tile 8. 8 is fixed to the metal casing 12. Therefore, the heat storage cartridge is burner tile 8
Thus, the seal 16 between the burner tile 8 and the heat storage case 3 is protected by being exposed to the low-temperature atmosphere. In addition, the code | symbol 1 in a figure
Reference numeral 0 denotes a fuel injection port of the burner tile 8 that accommodates the fuel nozzle 17, reference numeral 11 denotes a metal casing portion that protects the burner tile 8, and reference numeral 14 denotes a supply / exhaust port member that serves both as an air supply port and an exhaust port.

The heat storage case 3 has a narrowed portion 4 in front of a media storage portion 5 for storing the heat storage material 2 and has a cylindrical shape having a sharply tapered tip as a whole, and is integrally formed of the same material. I have. For example, when flowing exhaust gas of about 1000 ° C., heat-resistant steel such as stainless steel is used.
Ceramics such as SiC are used when flowing a higher degree of exhaust gas. In the case of stainless steel, the media storage section 5 and the drawing section 4 are welded.
Are welded and integrated. By changing the size of the opening at the tip of the throttle 4 of the media case, the injection speed (momentum) of the combustion air can be freely controlled, and the shape and properties of the flame can be changed. A flange 6 is formed at the rear end of the heat storage case 3 so as to be able to engage with a burner component such as the burner tile assembly 1 or the furnace body 13 when the heat storage cartridge is mounted. The cross-sectional shape of the heat storage case 3 is not particularly limited to a cylindrical shape, and a cross-sectional shape such as a square, a triangle, another polygon, or an ellipse may be appropriately used.

In the medium storage section 5 of the heat storage case 3,
The heat storage body 2 is inserted therein, and the filler 7 is disposed and incorporated in a gap between the heat storage body 2 and the media storage unit 5 as a housing around the heat storage body 2. The filler 7 has an appropriate fluidity at a high temperature and a solidification or a high tackiness at a low temperature, for example, a heat-resistant adhesive including an adhesive, a bonding agent, a curing agent, a filler and the like can be used. . Specifically, the filler 7 may be a water glass (a concentrated aqueous solution of an alkali silicate) or an alkali metal silicate such as potassium silicate, or a hose phosphate such as a metal phosphate to which an inorganic filler is added. Alternatively, a heat-resistant adhesive such as colloidal silica can be used, and for example, use of water glass or potassium silicate or a mixture thereof with another composition is preferable. As the mixture, use of ceramic fine powder such as alumina powder or refractory fine powder such as mortar is preferable. In particular, water glass is a highly viscous syrup-like liquid. When left in the air, water glass gradually decomposes and precipitates silicon dioxide, and solidifies in a gel state. Even at a high temperature of ~ 1200 ° C, it shows a high viscosity of about tar or slightly lower. As the water glass, for example, SiO ₂ (35-38)
_{%), Na 2 O (17-19} %), Fe ( 0.02%), the use of those compositions comprising a H ₂ O (about 50% or less) is preferred since it achieves the economical and desired effect . Water glass of this composition not only has a high fixing effect at low temperatures, but also has an adhesive force of 2.8 × 10 ⁻³ gf / mm ² or more even at a high temperature of about 1000 to 1200 ° C., and is inexpensive. is there. Therefore, when the temperature is high, the heat storage body 2 is gently held in the housing so as to be freely movable without being restrained, and when the temperature is low, the viscosity is increased and further solidified, so that the inside of the media storage unit (housing) 5 is increased. Fixed to. Use of water glass as a filler is suitable for a heat storage material made of alumina or the like. However, in the case of a heat storage body made of cordierite, potassium silicate is preferably used because corrosion may occur when the sodium component in the water glass comes into contact. On the other hand, it is preferable to use a combination of different materials, for example, a heat storage body of alumina and cordierite for a portion facing the inside of the furnace where the temperature is relatively high and a portion facing the outside of the furnace where the temperature is relatively low. In this case, a different filler material may be used for each material of the heat storage body.

This water glass / filler 7 has an appropriate amount on the inner wall surface of the housing of the heat storage body (including the aggregate of small blocks), that is, the outer wall surface facing the inner wall surface of the media storage portion 5. It is installed between the heat storage body 2 and the housing 5 by being applied and charged into the heat storage body case 3. The application amount of the water glass 7 is not limited to a specific amount, but requires an amount sufficient to fill a gap generated between the heat storage body 2 and the housing 5. On the other hand, the gap formed between the heat storage body 2 and the housing 5 is not made larger than necessary, and no heat is applied to the heat storage body when the heat storage body 2 is thermally expanded, or even if the heat storage body 2 is provided with a restraining force. Body 2
It is preferably set to a size that does not cause destruction or cracking. The water glass 7 may be loaded into the housing 5 without drying in a solution state, but it is used after being dried naturally or dried at a low temperature (50 ° C. or less) in advance for 1 to 24 hours. Is preferred. According to the results of experiments conducted by the present inventors, it has been found that it is difficult to ensure good retention of the heat storage body in a state of no drying or almost no drying. This is the water glass
Since foaming due to evaporation of water starts at about 80 ° C., when the foam is exposed to high-temperature exhaust gas and heated rapidly, foaming becomes remarkable and remains as bubbles, and the arrangement of the filler 7 is discontinuous and non-uniform. May be caused. Therefore, in the case of heat drying, it is desirable to heat at 50 ° C. or less for 1 hour or more, preferably for about 6 hours to 12 hours, and in the case of natural drying, it is desirable to dry sufficiently for 24 hours or more, preferably 5 days or more. It is.

The filler 7 may be disposed alone in the gap between the heat storage body 2 and the housing 5, but may be impregnated with a heat-resistant reinforcing material (not shown) in some cases. It is also possible. In this case, since the filler 7 is reinforced by the heat-resistant reinforcing material and is always fixed to the heat storage body 2 and the surrounding housing 5 while expanding and contracting the heat-resistant reinforcing material, the heat storage body 2 can be held more elastically. At the same time, the holding force of the filler 7 itself is increased to reduce the leakage of the fluid passing around the heat storage body 2, so that the fluid can be uniformly passed through the heat storage body 2. In addition, the heat storage material 2 and the housing 5 can be prevented from being directly contacted with each other by the heat-resistant reinforcing material to prevent cracks due to impact. Here, the heat-resistant reinforcing material is preferably a glass fiber or a ceramic fiber having heat resistance at a use temperature, or a woven or nonwoven fabric thereof, or a woven or nonwoven fabric of a heat-resistant metal.

The heat storage body 2 is preferably made of a material having a large heat capacity and high durability in spite of a relatively low pressure loss, for example, a cylindrical body having many honeycomb-shaped cell holes formed of ceramics. For example, 1000
For heat exchange between a high-temperature fluid of about 20 ° C. and a low-temperature fluid of about 20 ° C. such as combustion air, it is preferable to use a honeycomb-shaped one manufactured by extrusion using ceramics such as alumina, cordierite, and mullite. . In addition, the honeycomb-shaped heat storage body spontaneously penetrates the molten metal into the pores of other ceramics or a material other than the mix, such as a metal such as heat-resistant steel, or a composite of a ceramic and a metal such as a ceramic having a porous skeleton.
A part of the metal may be oxidized or nitrided to form a ceramic, and the metal may be manufactured using an Al ₂ O ₃ -Al composite, a SiC-Al ₂ O ₃ -Al composite or the like in which pores are completely filled. Although the honeycomb shape originally means a hexagonal cell (hole), the present specification includes not only an original hexagon but also an infinite number of square or triangular cells. Alternatively, the heat storage body 2 in a honeycomb shape may be obtained by bundling tubes or the like without integrally forming.

According to the heat storage body holding structure configured as described above, the heat storage body 2 is gently liquefied in a high temperature atmosphere of, for example, 800 ° C. or more because the water glass as the filler 7 is liquefied and exhibits appropriate fluidity. 5 and can move freely without being bound. For this reason, even if the heat storage element 2 moves due to thermal expansion or contraction, the heat storage element 2 and the housing 5 move while being fixed due to the viscosity of the water glass 7, and the gap is maintained while being filled with the filler 7. Is done. Therefore,
Fluid hardly passes around the heat storage body 2. Moreover, since the heat storage body 2 can move freely, an excessive restraining force is not given to the heat storage body, and breakage or cracking can be prevented. On the other hand, at a low temperature of, for example, 400 ° C. or lower, the viscosity of the filler 7 increases and further solidifies, so that the gap between the housing 5 and the heat accumulator 2 is solidified to hold the heat accumulator. In addition, even in the process of cooling the heat storage element, the filler material follows the movement of the heat storage element without being hindered from moving due to the contraction of the heat storage element due to the adhesive force and fluidity of the filler. Therefore, the heat storage body is not excessively restrained, and the gap between the heat storage body and the housing is kept filled with the filler.

Therefore, while allowing free thermal expansion without restricting the heat storage body, it is possible to reduce the leakage of the fluid passing around the heat storage body and to allow the fluid to uniformly pass through the heat storage body. As a result, it is possible to prevent uneven heat distribution inside the heat storage body, thereby reducing thermal stress and improving breakage and heat exchange efficiency. (Confirmation of Effect) The cartridge-type heat storage device shown in FIG. 1 in which the filler 7 made of water glass is disposed between the honeycomb-shaped heat storage material 2 made of alumina and the housing 5 has a temperature difference of 11 from normal temperature.
Heating and cooling were repeated between 00 ° C. As a result, when the temperature is low, the water glass 7 is hardened and the heat storage body 2 and the housing 5 are hardened.
And were mutually connected, and the fixing effect was high. Also, at high temperatures, the water glass 7 was liquefied and its viscosity was reduced, maintaining good fluidity and adhesion. The adhesive force at this high temperature was 2.8 × 10 ⁻³ gf / mm ² or more. Therefore, the water glass 7 prevents the heat storage body 2 from being separated from the housing 5. That is, even if the heat storage body repeats thermal expansion and contraction, the water glass follows the displacement accompanying the heat storage body, thereby preventing a gap from being formed between the heat storage body and the housing, thereby maintaining the fixed state. This result was the same for chamotte and cordierite.

Further, according to the regenerative burner adopting the heat storage body holding structure configured as in the embodiment of FIGS. 1 and 2, the media storage portion 5 and the throttle portion 4 forming a part of the air throat 9 are formed. Since the combustion air is supplied through the heat storage case 3 which is integrally molded and has a completely sealed structure in which the heat storage body 2 is incorporated without any gap, no leakage occurs even if the supply pressure is increased. Therefore, it is possible to increase the flow velocity of the combustion air, and the fuel jet is accompanied by the high-temperature and high-flow velocity combustion air jet, which is taken in from time to time to diffuse combustion and increase the gas flow in the furnace. Since NOx is taken into the fuel jet and reduced, or mixing of the furnace gas is promoted to form a smooth temperature distribution without a local high-temperature region, generation of NOx can be suppressed to a small level. Moreover, the mounting of the heat storage element 2 to the burner and replacement in the event of damage are performed in units of the heat storage cartridge, and only a heat storage element cartridge that has been manufactured in a factory or the like under sufficient quality control is prepared and inserted. Complete with For this reason, work such as fine adjustment on site and destruction or repair of the heat insulating wall is not required at all. Further, by exchanging the regenerator cartridge with a different opening size of the throttle unit 4, the injection speed (momentum) and direction of the combustion air into the furnace can be easily changed and freely controlled. The shape and properties of the flame.

FIGS. 3 and 4 show another embodiment of the heat storage body holding structure of the present invention. This heat storage body holding structure is one in which a fuel nozzle 17 ′ is arranged at the center of a cylindrical honeycomb heat storage body 2, and is suitable for application to a radiant tube burner. In this case, a part of the radiant tube forms the housing 5 and houses the heat storage body 2 inside. The space between the housing 5 and the heat storage body 2 and the heat storage body 2
By disposing fillers 7 and 7 ′ between the protective sheath tube 5 ′ and the protective sheath tube 5 ′ containing the fuel nozzle 17 ′, respectively,
The honeycomb-shaped regenerator 2 is elastically supported by the housings 5, 5 '. The primary air also serving as cooling air is flowed inside the protective sheath tube 5 ′, so that a considerable temperature difference is generated between the heat storage element 2 and the heat storage element 2. The body 2 is less likely to crack.

FIG. 5 shows another embodiment of the heat storage body holding structure of the present invention. This embodiment makes it possible to increase the size of the cartridge-type heat storage body shown in FIGS.
At present, the circular heat storage body 2 ′ made of ceramic has a diameter of 120 mmφ.
Degree is the limit of production. Therefore, as the heat storage body 2 ',
If the fan-shaped honeycomb-shaped heat storage material block pieces 2b,..., 2b are radially arranged around the circular honeycomb 2a at the manufacturing limit and joined together, a circular ceramic honeycomb larger than the limit of the size that can be manufactured. The heat storage body 2 'can be formed. If this heat storage element 2 'is housed in the housing 5 with the filler 7 interposed, the same operation and effect as those of the heat storage element holding structure of each of the above-described embodiments can be applied to the large heat storage element 2'. Can also be obtained. At this time, the water glass is solid at a low temperature, but liquefies again when heated to a high temperature.
Since it shows high viscosity like tar even at high temperature of 00 ° C,
It can also be used as a bonding agent between heat storage material block pieces.

FIG. 6 shows another embodiment of the heat storage body holding structure of the present invention. This heat storage element 2 ″ is formed by assembling honeycomb-shaped heat storage material block pieces 2c,..., 2c formed of a large number of rectangular blocks, and joining the adjacent block pieces 2c,.
2c are connected and integrated. Each heat storage material block piece 2c has a honeycomb shape having a large number of cell holes 1b defined by thin cell walls of, for example, about 0.5 to 2 mm. Also in this case, each heat storage material block piece 2
It is preferable to use the same water glass as the filler to adhere c,..., 2c to each other.

Although the above embodiment is an example of a preferred embodiment of the present invention, the present invention is not limited to this embodiment, and various modifications can be made without departing from the gist of the present invention. For example, the present invention can also be applied to a heat storage body formed by assembling heat storage material block pieces in the shape of a thin tube, a ball, or a nugget. In the case of a ball-shaped or nugget-shaped heat storage material, a gas flow path is formed around the heat storage material block piece, so there is a disadvantage that the pressure loss is large and dust is easily clogged as compared with the honeycomb-shaped heat storage material. However, it is possible to achieve an improvement in heat exchange capacity while having the advantage of being excellent in thermal shock resistance due to miniaturization.
Further, the heat storage body is not limited to each of the above-described embodiments, and may be of a type in which the heat storage body itself rotates or a type in which the fluid switching device rotates. Further, the shape of the heat storage body 2 is not particularly limited to the illustrated honeycomb shape, and a flat or corrugated heat storage material (not shown) may be radially or annularly arranged in the cylindrical media storage portion 5. A pipe-shaped heat storage material may be filled so that the fluid passes in the axial direction.

[0033]

As is apparent from the above description, the heat storage body holding structure of the present invention according to the first aspect uses a filler which has an appropriate fluidity at a high temperature and a solidification or a high tackiness at a low temperature. Since it is arranged between the housing and the heat storage element, the filler liquefies at high temperature and is held in a state where the movement of the heat storage element is allowed to move with high viscosity, so that the heat storage element is attached to the housing without being restrained. Freely movably connected,
In addition, the gap between the housing and the heat storage element is filled with a liquefied high-viscosity filler, and the heat storage element is held elastically.At low temperatures, the viscosity of the filler material increases and further solidifies because the filler is solidified. it can. In addition, even in the process of cooling the heat storage body, the fluidity of the filler does not hinder the movement of the heat storage body due to the shrinkage, so that the heat storage body is not excessively restrained. Can be prevented from being short-circuited by being filled with the filler and flowing around the heat storage element. As a result, it is possible to prevent uneven heat distribution inside the heat storage body, thereby reducing thermal stress and improving breakage and heat exchange efficiency.

According to the second aspect of the present invention, water glass or potassium silicate or a mixture of these and other compositions is used as the filler.
Not only is the fixing effect at a low temperature high, but it also stably retains the adhesive force that holds the heat storage body at a high temperature, and is inexpensive.

According to the third aspect of the present invention, since the heat-resistant reinforcing material is impregnated with the filler 7 and arranged, the filler is reinforced and the heat-storing body is always expanded while expanding and contracting the heat-resistant reinforcing material. And the surrounding housing is fixed to the heat storage body more elastically, and the holding force of the filler itself is increased to reduce the leakage of the fluid passing around the heat storage body, thereby allowing the fluid to uniformly pass through the heat storage body. obtain.

According to the fourth aspect of the invention, clogging and pressure loss are small.

According to the fifth aspect of the present invention, it is possible to form a circular heat storage element having a size equal to or larger than a limit size of a ceramic honeycomb heat storage element.

According to the heat storage body support structure of the sixth aspect, even if the supply pressure is increased in order to increase the injection speed of the combustion air to a high flow rate, leakage hardly occurs, and a high-speed jet can be formed. . In addition, since the seal between the heat storage case and the surrounding burner parts or furnace body is also performed in the low temperature part,
A low-temperature seal can be used, and sufficient sealing can be performed. Moreover, since the heat storage element can be incorporated without any gap by the filler, it can be easily incorporated so as to reduce the flow of air passing through the periphery of the heat storage element, and almost complete sealing can be achieved. Therefore, it is possible to increase the flow velocity of the combustion air, which makes the gas flow significantly stronger in a wide area of the heating space than before, and promotes entrainment and mixing of the gas in the furnace to lower the oxygen concentration of the combustion air. This causes the oxidation exothermic reaction to slow down and the convective heat transfer to increase, thereby eliminating the local temperature difference. Thus, the peak of the heat flux is kept small, and a uniform temperature distribution is formed. In addition, since the heat storage body is in the form of a cartridge in which it is housed in a case in advance, the medium can be easily replaced, and fine adjustments on site, breakage and repair of the heat insulating wall, and the like are not required at all.

Further, according to the invention, the regenerative burner is operated only after the heat storage element is loaded into the housing without any gap, and the filler previously attached to the surface facing the housing is liquefied. As a result, it penetrates into the gap between the housing and the heat storage body by capillary action and can be easily arranged at an appropriate position.

[Brief description of the drawings]

FIG. 1 is a central longitudinal sectional view showing an embodiment in which a heat storage body holding structure of the present invention is applied to a cartridge type heat storage body.

FIG. 2 is a cross-sectional view of the cartridge type heat storage unit of FIG.

FIG. 3 is a longitudinal sectional view showing an example in which the heat storage body holding structure of the present invention is applied to a radiant tube burner.

FIG. 4 is a cross-sectional view of the heat storage body of FIG.

FIG. 5 is a cross-sectional view showing an embodiment in which the present invention is applied to holding of a heat storage unit in a cartridge type heat storage unit.

FIG. 6 is a cross-sectional view showing an example of a heat storage body holding structure formed by assembling a large number of rectangular heat storage material block pieces.

7A and 7B are views showing a structure for mounting a heat storage body in a conventional heat storage type burner, wherein FIG. 7A shows a type connected outside the burner, and FIG. 7B shows a type mounted directly to a burner tile.

[Explanation of symbols]

 2 Thermal storage 5,5 ', 5 "Housing 7,7' Filler

[Procedure amendment]

[Submission date] February 16, 1998

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0003

[Correction method] Change

[Correction contents]

[0003]

In Conventional regenerative burners are provided so as to regenerator is housed in a box-shaped metallic case made either connected to the outside of the burner, or is interior to the air throat. For example, in the case of a regenerative burner as shown in FIG. 7A, a heat storage element 102 is placed in a box-shaped metal casing (hereinafter referred to as a housing) 101 lined with a heat insulating material, and then a wind box having the same configuration is used. The wind box 103 is connected to the refractory burner tile 104 in such a manner as to abut against the burner tile 104. In this case, if the heat storage element 102 is loaded without a gap between the heat storage element 102 and the housing 101, the heat storage element 102 may be broken or cracked when thermally expanded, so the heat storage element 102 is loaded without a gap. It is not possible.
On the other hand, if a gap is generated around the heat storage body 102, the pressure loss is much smaller than that of the flow path / cell hole in the heat storage body, so that the fluid passing therethrough becomes overwhelmingly large.
For this reason, the temperature efficiency is reduced, and a large variation occurs in the flow rate of the fluid, and an extreme temperature difference occurs in the heat storage body (in the case of exhaust gas, a place where the flow rate is large is hot, and a place where the flow rate is small is relatively cold). Cracking due to thermal stress is caused.

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0022

[Correction method] Change

[Correction contents]

In the medium storage section 5 of the heat storage case 3,
The heat storage body 2 is inserted therein, and the filler 7 is disposed and incorporated in a gap between the heat storage body 2 and the media storage unit 5 as a housing around the heat storage body 2. The filler 7 has an appropriate fluidity at a high temperature and a solidification or a high tackiness at a low temperature, for example, a heat-resistant adhesive including an adhesive, a bonding agent, a curing agent, a filler and the like can be used. . Specifically, the filler 7 may be a water glass (a concentrated aqueous solution of an alkali silicate) or an alkali metal silicate such as potassium silicate, or a hose phosphate such as a metal phosphate to which an inorganic filler is added. Alternatively, a heat-resistant adhesive such as colloidal silica can be used, and for example, use of water glass or potassium silicate or a mixture thereof with another composition is preferable. As the mixture, use of ceramic fine powder such as alumina powder or refractory fine powder such as mortar is preferable. In particular, water glass is a highly viscous syrup-like liquid. When left in the air, water glass gradually decomposes and precipitates silicon dioxide and solidifies into a gel. Even at a high temperature of ~ 1200 ° C, it shows a high viscosity of about tar or slightly lower. As the water glass, for example, SiO ₂ (35-38)
_{%), Na 2 O (17-19} %), Fe ( 0.02%), the use of those compositions comprising a H ₂ O (about 50% or less) is preferred since it achieves the economical and desired effect . The water glass having this composition not only has a high fixing effect at low temperatures, but also has an adhesive force of 2.8 × 10 ⁻³ gf / mm ² or more even at a high temperature of about 1000 to 1200 ° C., and is inexpensive. is there. Therefore, when the temperature is high, the heat storage body 2 is gently held in the housing so as to be freely movable without being restrained, and when the temperature is low, the viscosity increases and further solidifies, so that the medium storage portion (housing) 5 is formed.
Fix inside. Use of water glass as a filler is suitable for a heat storage material made of alumina or the like. However, in the case of a heat storage body made of cordierite, the use of potassium silicate is preferable because corrosion may occur when the sodium component in the water glass comes into contact. On the other hand, it is preferable to use a combination of different materials, for example, a heat storage material of alumina and cordierite for a portion facing the inside of the furnace where the temperature is relatively high and a portion facing the outside of the furnace where the temperature is relatively low. In this case, a different filler material may be used for each material of the heat storage body.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0032

[Correction method] Change

[Correction contents]

Although the above embodiment is an example of a preferred embodiment of the present invention, the present invention is not limited to this embodiment, and various modifications can be made without departing from the gist of the present invention. For example, the present invention can also be applied to a heat storage body formed by assembling heat storage material block pieces in the shape of a thin tube, a ball, or a nugget. In the case of a ball-shaped or nugget-shaped heat storage material, a gas flow path is formed around the heat storage material block piece, so there is a disadvantage that the pressure loss is large and dust is easily clogged as compared with the honeycomb-shaped heat storage material. However, it is possible to achieve an improvement in heat exchange capacity while having the advantage of being excellent in thermal shock resistance due to miniaturization.
Also, the regenerator is not limited to the embodiments described above, the format of the regenerator itself rotates and also of those can also be used of the type fluid diverter is rotated. Further, the shape of the heat storage body 2 is not particularly limited to the illustrated honeycomb shape, and a flat or corrugated heat storage material (not shown) may be radially or annularly arranged in the cylindrical media storage portion 5. A pipe-shaped heat storage material may be filled so that the fluid passes in the axial direction.

Continuation of front page (72) Inventor Makoto Miyata 2-1-153 Shirite, Tsurumi-ku, Yokohama-shi, Kanagawa Japan Furnace Industry Co., Ltd.

Claims (7)

[Claims] 1. A structure in which a heat storage body is held in a housing, wherein a filler having a suitable fluidity at a high temperature and a solidification or high tackiness at a low temperature is disposed between the housing and the heat storage body. A heat storage body holding structure characterized by the above-mentioned. 2. The heat storage body holding structure according to claim 1, wherein the filler is water glass, potassium silicate, or a mixture thereof with another composition. 3. The heat storage body holding structure according to claim 1, wherein the filler is disposed by impregnating the glass fiber. 4. The heat storage body according to claim 1, wherein the heat storage body is a set of honeycomb-shaped rectangular heat storage material block pieces or thin tubular heat storage material block pieces that form a linear minimum flow path. The heat storage body holding structure according to any one of the above. 5. The heat storage body holding structure according to claim 1, wherein said heat storage body is formed in a cylindrical shape by joining fan-shaped honeycomb-shaped heat storage material block pieces. 6. The heat storage of an integrally formed cylindrical shape having a media storage portion for storing the heat storage element, a throttle portion disposed forward of the housing to narrow a flow path, and a flange portion disposed rearward. 6. A cartridge type comprising a body case, wherein a seal with a burner part or a furnace body is enabled at the flange portion, and the heat storage body can be attached to the heat storage body case. The structure for holding a heat storage body according to any one of the above. 7. The heat storage element is characterized in that at least a surface facing the housing has a filler having a suitable fluidity at a high temperature and a solidification or high tackiness at a low temperature. A heat storage body holding structure according to claim 1.