JP3786347B2 - Mechanism for suppressing reduction in heat recovery efficiency of heat storage section in regenerative burner - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention provides a heat recovery efficiency reduction suppression mechanism for a heat storage section in a regenerative burner having a structure in which the supply and exhaust air passes through the heat storage section filled with the heat storage body in a substantially horizontal direction, particularly the heat recovery efficiency due to the volume reduction of the heat storage body. The present invention relates to a mechanism for suppressing the decrease.
[0002]
[Prior art]
The regenerative burner system uses two burners with a heat storage section filled with a heat storage body such as alumina balls in the internal air supply / exhaust flow path, and alternately performs switching combustion as a set, so that the inside of the heat storage section It is a high-efficiency combustion system that recovers waste heat using a heat storage body.
[0003]
7 and 8 show a conventional configuration example of a heat storage unit in a regenerative burner, in this case, a heat storage unit through which air supply and exhaust passes in a substantially horizontal direction. In these drawings, symbol a is a supply / exhaust flow path, and a heat storage section c is formed by a breathable support b in the supply / exhaust flow path a, and a fuel supply pipe d passing through the heat storage section c is formed. ing. The heat storage section c is filled with a heat storage body f such as an alumina ball from a filling port e provided on the upper side, and the lid g is closed after filling. The symbol h is a heat resistant wall.
[0004]
In the above configuration, when the burner on the side shown in the figure is combusted, the combustion air flows in the right direction in the heat storage section c as indicated by the solid line in the figure, and at this time, heat is stored in the heat storage body f in the previous cycle. As the heat is recovered, the fuel flows to the right in the fuel supply pipe d and is mixed on the downstream side to be burned.
[0005]
On the other hand, when the combustion of the burner on the side shown in the figure is stopped, that is, at the time of exhaust, the exhaust gas generated by the combustion on the other burner side flows in the left direction in the heat storage section c as indicated by the broken line in the figure, Heat storage is performed on the heat storage body f.
[0006]
[Problems to be solved by the invention]
As shown in FIG. 7, the heat storage body f filled in the heat storage section c is clogged over the entire space constituting the heat storage section c, as shown in FIG. Since the exhaust gas always flows through the portion where the heat accumulator c is clogged, heat exchange with the heat accumulator c is favorably performed.
[0007]
However, the alumina ball or the like as the heat storage body f is a. Improvement of packing density by vibration or the like, b. Cracks due to mechanical shock or heat shock, c. The volume decreases due to the wear of the surface of the heat accumulator f and the like, and therefore the filling height decreases, so that a gap i where the heat accumulator f is not clogged is formed on the upper side of the heat accumulator c.
[0008]
When such a gap i is formed, as shown in FIG. 8, a part of the combustion air or the exhaust gas flows through the gap i without flowing through the space where the heat accumulator f is packed. As a result, a part of combustion air or exhaust gas that does not exchange heat with the heat accumulator f is present, leading to a reduction in heat recovery efficiency.
The present invention aims to solve such problems.
[0009]
[Means for Solving the Problems]
In order to solve the above-described problems, in the present invention, in a regenerative burner having a structure in which air supply and exhaust passes in a substantially horizontal direction through a heat storage section filled with a ball-shaped heat storage body, a heat-resistant structure is formed on the upper side of the heat storage section. The ventilation baffle means is provided so as to be able to move up and down in accordance with the filling height of the heat storage body that decreases as the heat storage body volume decreases, and this ventilation baffle means is composed of a pair of plate-like bodies arranged at intervals, respectively. This proposes a mechanism for suppressing the reduction in heat recovery efficiency of the heat storage section in a regenerative burner projecting with the inclined section facing the lower portion of the plate-like body .
[0010]
The pair of plate-like bodies in the ventilation baffle means can be combined to form a hopper shape.
[0011]
The venting means can also be a thick block-like configuration.
[0012]
Moreover, in this invention, in order to solve the subject mentioned above, in the regenerative burner which has the structure where the inside of the heat storage part filled with the ball-shaped heat storage body passes through the horizontal direction in the horizontal direction, from the upper part of the heat storage part downward. A heat-resistant ventilation baffle plate is projected, and the lower end of this ventilation baffle plate is positioned below the minimum filling height due to the expected decrease in the heat storage body in the design. A mechanism to suppress recovery efficiency reduction is proposed.
[0013]
In the first to third aspects of the present invention, when the volume of the ball-shaped heat storage body is reduced due to the above-described causes and the filling height is lowered, the airflow obstruction such as a plate shape, a hopper shape, or a block shape is also accompanied. The means are also lowered. For this reason, even if there is a gap on the upper side of the heat storage section in a portion other than the corresponding portion of the ventilation baffle means, combustion air and exhaust gas are obstructed from flowing into the gap by the ventilation baffle means. The working air and the exhaust gas can flow through the space where the heat accumulator is packed.
[ 0014 ]
In the invention described in claim 4 , even if the volume of the ball-shaped heat storage body is reduced due to the above-described causes, the filling height is lowered, and a gap on the upper side is generated, a ball-like shape that is expected in design is provided. At the lowest filling height due to the reduction of the heat storage body, the lower end of the ventilation baffle plate is below this lowest filling height, so that combustion air and exhaust gas are obstructed from flowing into the gap by the ventilation baffle plate, Most of the combustion air and exhaust gas can flow through the space filled with the ball-shaped heat accumulator.
[ 0015 ]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment of the present invention will be described with reference to FIGS.
1 and 2 show a first embodiment of a heat recovery efficiency reduction suppressing mechanism according to the present invention. In the figure, reference numeral 1 denotes a supply / exhaust flow path, and a heat storage section 3 through which the supply / exhaust air passes in a substantially horizontal direction is constituted by a breathable support 2 in the supply / exhaust flow path 1. 3 constitutes a fuel supply pipe 4 passing through 3. The heat storage section 3 is filled with a heat storage body 6 such as an alumina ball from a filling port 5 provided on the upper side, and the lid 7 is closed after filling. Reference numeral 8 denotes a heat-resistant wall.
[ 0016 ]
And in the filling port 5 on the upper side of the heat storage unit 3, a pair of heat-resistant plate-like bodies 9a, 9b are configured to be movable up and down as a ventilation obstruction means, and these plate-like bodies 9a, 9b are The inclined portions 10a and 10b are provided so as to protrude from the lower portions. The pair of plate-like bodies 9a and 9b are combined to form a hopper shape. The pair of plate-like bodies 9 a and 9 b are expanded in the transverse direction of the flow path on the upper side of the heat storage unit 3.
[ 0017 ]
In the above configuration, the heat storage section 3 is filled with the heat storage body 6 such as an alumina ball from the filling port 5 on the upper side, and the lid 7 is closed after filling. In this filled state, the plate-like bodies 9a, 9b are supported at the highest position by the filled heat storage body 6, and the heat storage body 6 is also located in the space between the plate-like bodies 9a, 9b.
[ 0018 ]
In the above configuration, when the burner on the side shown in the figure is burned, the combustion air flows in the right direction in the heat storage section 3 as indicated by the solid line in the figure, and at this time, the heat storage body 6 stores heat in the previous cycle. As the heat is recovered, the fuel flows to the right in the fuel supply pipe 4 and is mixed on the downstream side for combustion.
[ 0019 ]
On the other hand, when the combustion of the burner on the side shown in the figure is stopped, that is, when exhausting, as shown by the broken line in the figure, the exhaust gas generated by the combustion on the other burner side flows in the left direction in the heat storage section 3, Heat storage is performed by exchanging heat with the heat storage body 6.
[ 0020 ]
As shown in FIG. 1, the heat storage body 6 filled in the heat storage unit 3 is clogged over the entire space constituting the heat storage unit 3 as shown in FIG. Since the exhaust gas always flows through the portion where the heat accumulator 6 is clogged, heat exchange with the heat accumulator 6 is favorably performed. In addition, since the lower ends of the plate-like bodies 9a and 9b as the ventilation obstructing means are in an upward state, they do not obstruct the ventilation.
[ 0021 ]
However, when the volume of the heat accumulator 6 decreases due to the above-mentioned causes, the filling height decreases as shown in FIG. 2, and the plate-like bodies 9 a and 9 b are also disposed on the inner periphery of the filling port 5. Descend vertically along.
[ 0022 ]
From the above, even if the gap 11 is formed on the upper side of the heat storage unit 3 in the portions other than the plate-like bodies 9a and 9b, the combustion air and the exhaust gas are obstructed by the plate-like bodies 9a and 9b. 11 so that most of the combustion air or exhaust gas flows into the space where the heat accumulator 6 is packed, as indicated by the solid line (combustion air) and the broken line (exhaust gas) in the figure. Can be. Therefore, the heat exchange between the combustion air or the exhaust gas and the heat storage body 6 is performed satisfactorily, and the reduction in the heat recovery efficiency can be minimized. In the above-described operation, the plate-like bodies 9a and 9b themselves as a ventilation obstructing means can also contribute to heat recovery as a heat storage body.
[ 0023 ]
In the above description, the pair of plate-like bodies 9a and 9b are combined to form a hopper shape, but they can be operated independently without being combined.
As described above, even when the pair of plate-like bodies 9a and 9b can be operated independently, by projecting the inclined portions 10a and 10b to face the lower portions of the respective plate-like bodies, the plate-like bodies 9a are provided. 9b can be lowered vertically along the inner periphery of the filling port 5 when the filling height of the heat storage body 6 is lowered. Moreover, a plate-like body can also be comprised by one.
[ 0024 ]
Next, FIG. 3 and FIG. 4 show a second embodiment of the heat recovery efficiency lowering suppression mechanism according to the present invention. In the second embodiment, only the configuration of the ventilation baffle means is the first. Since it is different from the embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and redundant description is omitted.
In this second embodiment, the ventilation block means has a thick block configuration, that is, a thick block 12 is fitted to the filling port 5 so as to be movable up and down.
[ 0025 ]
In this configuration, as shown in FIG. 3, immediately after filling, the heat storage body 6 filled in the heat storage unit 3 is clogged over the entire space constituting the heat storage unit 3, and thus flows through the supply / exhaust flow path 1. Combustion air or exhaust gas always flows through the portion where the heat accumulator 6 is clogged, and the lower end of the block 12 as the ventilation block means is in an elevated state, so that it does not block the ventilation.
[ 0026 ]
When the volume of the heat storage body 6 is reduced due to the above-described causes, the filling level is lowered as shown in FIG. 4, but the block 12 is also lowered at the same time. For this reason, even if a gap 11 is formed on the upper side of the heat storage section 3 in a portion other than the block 12, the combustion air and exhaust gas are obstructed by the block 12, so that they do not flow through the gap 11. As indicated by a solid line (combustion air) and a broken line (exhaust gas), most of them can flow in a space in which the heat accumulator 6 is packed. Therefore, the heat exchange between the combustion air or the exhaust gas and the heat storage body 6 is performed satisfactorily, and the reduction in the heat recovery efficiency can be minimized. In the above-described operation, the block 12 itself as a ventilation baffle means can also contribute to heat recovery as a heat storage body.
[ 0027 ]
Next, FIG. 5 and FIG. 6 show a third embodiment of the heat recovery efficiency lowering suppression mechanism according to the present invention. This third embodiment is the only configuration of the ventilation baffle means. Since it is different from the embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and redundant description is omitted.
In the third embodiment, the ventilation baffle means has a plate-like configuration, that is, a heat-resistant ventilation baffle plate 13 is provided so as to protrude downward from the upper part of the heat storage unit 3. The lower end is positioned below the minimum filling height due to the decrease in the heat storage body 6 expected in design.
[ 0028 ]
In this configuration, the ventilation baffle plate 13 is in the flow path even when the heat storage body 6 is clogged over the entire space constituting the heat storage section 3 as shown in FIG. Moreover, although the heat exchange efficiency with the heat storage body 6 of the part which adjoins the ventilation baffle plate 13 falls a little, it is not a grade which becomes a problem.
[ 0029 ]
Even if the volume of the heat storage body 6 decreases and the filling height decreases due to the above-described causes, the lower end of the ventilation baffle plate 13 is at the lowest filling height of the heat storage body 6 that is expected in design. Therefore, the combustion air and exhaust gas are obstructed by the ventilation baffle plate 13 and therefore do not flow through the gap 11 formed on the upper side of the heat storage unit 3. In this way, most of them can flow through the space where the heat storage body 6 is packed. Therefore, the heat exchange between the combustion air or the exhaust gas and the heat storage body 6 is performed satisfactorily, and the reduction in the heat recovery efficiency can be minimized. In the above operation, the block 12 itself as a ventilation obstructing means can be used as a heat accumulator to contribute to heat recovery.
[ 0030 ]
【The invention's effect】
Since the heat recovery efficiency lowering suppression mechanism of the heat storage section in the regenerative burner of the present invention is as described above, the following effects are obtained.
a. Even when the volume of the heat accumulator is reduced and the filling level is lowered, most of the combustion air and exhaust gas can be passed through the space where the heat accumulator is clogged, and operation with minimal decline in heat recovery efficiency is possible. Can continue.
b. Conventionally, since the heat recovery efficiency is reduced when the volume of the heat storage body is reduced, maintenance for replenishing the heat storage body is necessary, but such maintenance work can be reduced.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing the configuration and operation of a first embodiment of a heat recovery efficiency reduction suppressing mechanism of a heat storage unit to which the present invention is applied.
FIG. 2 is a longitudinal sectional view showing the configuration and operation of the first embodiment of the heat recovery efficiency lowering suppression mechanism of the heat storage unit to which the present invention is applied in a state where the volume of the heat storage body is reduced. It is a longitudinal cross-sectional view which shows the structure and operation | movement of 2nd Embodiment of the heat recovery efficiency fall suppression mechanism of the thermal storage part to which this invention is applied.
FIG. 4 is a longitudinal sectional view showing the configuration and operation of the second embodiment of the heat recovery efficiency lowering suppression mechanism of the heat storage unit to which the present invention is applied in a state where the volume of the heat storage body is reduced. It is a longitudinal cross-sectional view which shows the structure and operation | movement of 3rd Embodiment of the heat recovery efficiency fall suppression mechanism of the thermal storage part to which this invention is applied.
FIG. 6 is a longitudinal sectional view showing the configuration and operation of the third embodiment of the heat recovery efficiency lowering suppression mechanism of the heat storage unit to which the present invention is applied in a state where the volume of the heat storage body is reduced. It is a longitudinal cross-sectional view which shows the structure and operation | movement of the thermal storage part of the conventional regenerative burner.
FIG. 8 is a longitudinal sectional view showing a configuration and operation of a heat storage section of a conventional regenerative burner in a state where the volume of the heat storage body is reduced.
DESCRIPTION OF SYMBOLS 1 Supply / exhaust flow path 2 Support body 3 Heat storage part 4 Fuel supply pipe 5 Filling port 6 Heat storage body 7 Cover 8 Heat-resistant wall 9a, 9b Plate-shaped body 10a, 10b Inclination part 11 Crevice 12 Block 13 Ventilation baffle plate

Claims (4)

In a regenerative burner that has a structure in which the supply and exhaust of air passes through a heat storage section filled with a ball-shaped heat storage body in a substantially horizontal direction, the heat-resistant ventilation baffle means is lowered on the upper side of the heat storage section as the heat storage body volume decreases. depending on the filling height of the regenerator vertically movable to, the ventilation baffle means is composed of a pair of plate-like member placed at spaced intervals, facing the inclined portion to the lower portion of each of the plate-like body For reducing the heat recovery efficiency of the heat storage section in a regenerative burner, 2. A mechanism for suppressing a decrease in heat recovery efficiency of a heat storage section in a regenerative burner according to claim 1 , wherein a pair of plate-like bodies are combined to form a hopper-like structure. In a regenerative burner that has a structure in which the supply and exhaust of air passes through a heat storage section filled with a ball-shaped heat storage body in a substantially horizontal direction, the heat-resistant ventilation baffle means is lowered on the upper side of the heat storage section as the heat storage body volume decreases. The regenerative burner has a heat recovery efficiency lowering suppression mechanism provided in a regenerative burner , which is provided so as to be movable up and down according to the filling height of the heat storage body. In a regenerative burner having a structure in which air supply and exhaust passes in a substantially horizontal direction through a heat storage section filled with a ball-shaped heat storage body, a heat-resistant ventilation baffle plate protrudes downward from the upper part of the heat storage section, and this ventilation baffle The lower end of the plate is positioned below the minimum filling height due to a decrease in the heat storage body that is expected in the design, and the heat recovery efficiency lowering suppression mechanism of the heat storage section in the regenerative burner is characterized.

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