JP2744700B2 - Flow path switching device, heat storage type alternate combustion burner system and heat storage type heat exchange system using the same - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a flow path switching device suitable for switching between two gas flow paths, a heat storage type heat exchange system using the same, and a heat storage type alternating combustion burner system.
More specifically, the present invention provides a flow path switching device for switching between two flow paths such as a flow path for flowing a high-temperature gas and a flow path for flowing a low-temperature gas, and two fluids having a temperature difference alternately. The present invention relates to a heat storage type heat exchange system such as a waste heat recovery system or a heat storage type heat exchanger that allows heat exchange to be performed through a heat storage body, and a heat storage type alternate combustion burner system using the same.

BACKGROUND ART In recent years, a technology for recovering a considerable amount of heat from exhaust gas using a heat storage body and preheating combustion air has been developed. For example, as shown in FIG. 8, a burner 103 having a heat storage body 102 is provided at both ends of a radiant tube 101, and these are alternately burned and the combustion gas is discharged through the heat storage body 102 on the burner side not burning. In this way, a radiant tube burner that preheats combustion air using heat of the combustion gas stored in the heat storage body 102 has been proposed.

In such a heat storage type alternate combustion burner system, a flow path switching device that switches between a flow path in which high-temperature exhaust gas flows and a flow path in which low-temperature combustion air flows with respect to the heat storage body is required. Conventionally, an electromagnetic valve is generally used as such a flow path switching device in a combustion system. For example, as shown in FIG. 8, solenoid valves 104, 105, 106,
107 is provided, and by selectively opening and closing them, the flow path of the high-temperature gas and the low-temperature gas can be switched. Incidentally, reference numerals 108 and 109 in the figure are solenoid valves for selectively opening and closing the fuel supply system 110.

However, the flow path switching device constituted by the electromagnetic valves requires a large number of expensive electromagnetic valves, and thus increases equipment costs. In particular, when applied to heat exchange in a combustion system, a large number of more expensive high-temperature solenoid valves are required, which increases equipment costs. In addition, since the solenoid valve for air piping is quite large, it requires four of them and takes a considerable space, and the piping is doubled and complicated. For example, when it is applied to a heating furnace, a soaking furnace, or the like in a steel mill or the like, several thousand solenoid valves are required. In addition, when switching between air and exhaust gas is frequently performed in a short time of less than one minute, the durability of the solenoid valve is uneasy.

It is also conceivable to use a four-way switching valve 207 as shown in FIG. The four-way switching valve 207 is configured such that two adjacent two of the four ports are communicated with each other by a switching valve 206 that rotates in a valve casing 205 having four boats 201, 202, 203, and 204 to switch the flow path. Things.

However, since the four-way valve alternately introduces a gas having a considerable temperature difference, a clearance is provided between the switching valve 206 and the valve body 205 in order to prevent an operation failure due to thermal expansion. It is necessary, and there is a possibility that two flow paths may cause a short path in the valve to cause gas leakage. For example, when used in the illustrated heat storage type radiant tube burner, combustion air constantly leaks to the exhaust gas flow path side in the four-way valve 207, and the amount of the leak is not constant and unknown, so the combustion air ratio is accurately determined. The disadvantage is that you can't control it. Further, since it is difficult to increase the size of the four-way valve, it is not suitable for a large-capacity flow path system.

As a heat exchange system for performing heat exchange between two fluids via a heat storage body, a Jungstrom-type air preheater as shown in FIG. 10 is generally used. This Jungstrom-type air preheater 400 has a disk-like heat storage element in which a duct 402 through which a relatively high-temperature gas such as exhaust gas flows and a duct 403 through which a low-temperature gas flows such as combustion air are fixed. By rotating the 401, the flow of gas to the heat storage body 401 is switched without changing the flow path itself, and the combustion air is preheated using the heat recovered from the exhaust gas. In the Jungstrom-type air preheater 400, the upstream side and the downstream side of the rotating heat storage body 401 are divided into at least two chambers 406, 407 and 409, 410 by partition walls 405, 408 and a sealing material 404. The heat storage body 401 is substantially divided into two regions by a sealing material 404, and is provided so as to be heated by exhaust gas in one region and to preheat combustion air in the other region.

However, in the case of this Jungstrom type air preheater,
Fluid leakage from the high pressure (low temperature gas) side to the low pressure (high temperature gas) side occurs. Various measures have been devised for the seal in order to prevent this leakage. However, on the high temperature side before the heat exchange, the sealing effect is not improved and the leakage cannot be suppressed. For this reason, if it is large, about 25% of the combustion air leaks to the exhaust gas flow path side, and the amount of the leak is not constant, so if the preheated air is used as it is in the combustion system, the air ratio is accurately controlled. There is a problem of not being able to do so. In addition, when a large heat storage element is used, the heat storage element becomes heavy, so that the structure of the rotating mechanism becomes large, and the strength of the heat storage element becomes uneasy.

DISCLOSURE OF THE INVENTION The present invention relates to a flow path switching method capable of performing a high-speed flow switching operation with a simple structure without mutual gas leakage between two flow paths, for example, two flow paths having a temperature difference. It is a first object to provide a device.

In order to achieve such an object, the flow path switching device of the present invention includes a fixed chamber member divided into two fixed chambers by a partition wall,
A casing comprising a switching chamber member divided into two switching chambers by a partition wall orthogonal to the partition wall of the fixed chamber member, and separating the fixed chamber member and the switching chamber member in the flow direction; A communication hole that is perforated in the partition wall in the flow direction and communicates with one fixed chamber in a region where two switching chambers overlap with each other and the other fixed chamber in a region where the two switching chambers overlap with each other; Is connected to one of the two switching chambers while the other fixed chamber is connected to the other switching chamber. Here, the switching means is a butterfly-type damper that alternately closes two communication holes existing in the same room, or provided with through holes that alternately open two communication holes existing in the same room at every 180 °. It is preferably a rotating disk.

Therefore, according to these flow path switching devices, the first fixed chamber of the fixed chamber member is connected to one switching chamber of the switching chamber member, and at the same time, the other switching chamber is connected to the second fixed chamber. By one opening / closing operation of the switching unit, a flow path switching operation between two flow paths, for example, flow paths of two gases having a temperature difference, can be performed reliably and at high speed without gas leakage. In particular, in the case of a mechanism in which a butterfly type switching means is combined, the flow path switching operation is performed in a state of receiving the supply pressure and the exhaust pressure, so that the shut-off (shutdown) can be performed instantaneously, and the gas at the time of the switching is switched. Low leakage.
According to the flow path switching device of the present invention, the opening and closing of the four communication holes can be driven by one driving device (switching means).
It can be made extremely compact as compared with the conventional switching method.

Further, the present invention provides a flow path switching device used for a regenerative alternating combustion burner system, which is much more compact and inexpensive than an electromagnetic valve, so that leakage of combustion air and combustion exhaust gas hardly occurs. For other purposes.

In order to achieve this object, the regenerative alternating combustion burner system of the present invention provides a combustion air system in one of the two fixed chambers of the fixed chamber member of the above flow path switching device, and an exhaust gas system in the other chamber. Connected to the two switching chambers of the switching chamber member, and an alternate combustion type burner for supplying combustion air and discharging combustion gas through the heat storage is installed, and the flow path switching device is provided. While the burners are alternately burned by the combustion air supplied through the burner, the combustion gas discharged from the burner that is not burning is discharged through the flow path switching device.

In the case of this heat storage type alternating combustion burner system, the switching means can be mechanically switched, so that the switching cycle between combustion air and exhaust gas can be reliably realized at a high speed of several tens of seconds, and when an electromagnetic valve is used. In addition, the equipment cost can be made much lower than that of, and the device can be used stably for a long time. Further, according to the conventional regenerative burner system, two air pipes and two exhaust pipes are required for a pair of regenerative burners, but according to the present invention, one air pipe and one exhaust pipe are required. Only simple exhaust piping is sufficient, and no fluid leakage is involved.

Still another object of the present invention is to provide a heat storage type heat exchange system that can exchange heat by passing two fluids having a temperature difference without switching two flow paths.

In order to achieve such an object, the heat storage type heat exchange system of the present invention installs the above-described flow path switching devices on the upstream side and the downstream side of the heat storage body, respectively, and converts the fluid changed in the upstream side flow path switching apparatus. After the flow has passed through the heat accumulator, the flow is returned again in the downstream flow path switching device, and the flow path is changed in the heat accumulator.

In the case of this heat storage type heat exchange system, since there is no need to rotate the heat storage body, there are few problems such as damage to the heat storage body, and the seal is simple and the leakage of fluid is small.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing one embodiment of the flow path switching device of the present invention. FIG. 2 is a perspective view showing another embodiment of the flow switching device of the present invention. FIG. 3 (A) is a longitudinal sectional view showing an embodiment of a flow path switching device having an X-shaped partition wall, and FIG. 3 (B).
FIG. 3 is a sectional view taken along the line III-III in FIG. 4th
FIG. 4A is a longitudinal sectional view showing an embodiment of a flow path switching device having a Y-shaped partition wall, and FIG. 4B is a sectional view taken along line IV-IV in FIG. 4A. FIG. 5 is a schematic diagram showing an example of a regenerative alternating combustion system to which the flow path switching device of the present invention is applied. FIG. 6 is a schematic diagram showing an example of a regenerative heat exchange system to which the flow path switching device of the present invention is applied. FIG. 7 is a perspective view showing another example of the regenerative alternating combustion system. FIG. 8 is a schematic diagram showing an example of a regenerative radiant tube burner incorporating a conventional electromagnetic switching valve. FIG. 9 is a schematic view of a regenerative radiant tube burner incorporating a conventional four-way switching valve. FIG. 10 is a schematic diagram showing an example of a Jungstrom type air preheater which is a conventional heat exchanger for waste heat recovery.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a configuration of the present invention will be described in detail based on an embodiment shown in the drawings.

FIG. 1 shows an embodiment of the flow path switching device of the present invention.
In this embodiment, a butterfly valve is provided as a switching unit.

The flow path switching device 1 is for switching the flow of fluid flowing through two different flow paths, and includes a fixed chamber member 2, a switching chamber member 4, and a fixed chamber member 2 between them.
And a switching means 3 for selectively changing a portion for partitioning and opening / closing the switching chamber member 4.

In the case of this embodiment, the fixed chamber member 2 is connected, for example, by a vertical partition wall 5 to the first fixed chamber 2a connected to the flow path of one system and the second fixed chamber 2a connected to the flow path of the other system. Fixed room 2b
It is divided into and. Further, the switching chamber member 4 is firstly separated by a horizontal partition wall 6 orthogonal to the partition wall 5 of the fixed chamber member 2.
And a second switching chamber 4d. The fixed chamber member 2 and the switching chamber member 4 are separated by a partition wall 7 in the flow direction. Therefore, these fixed chamber members 2 and switching chamber members 4
The first switching chamber 4c of the switching chamber member 4 and the second switching chamber 4
The switching chamber 4d of the first switching chamber 4c and the second switching chamber 4d of the switching chamber member 4 overlap with the switching fixed chamber 2b of the fixed chamber member 2, and the switching chamber 4d is partitioned at 90 ° intervals. -Shaped 4 rooms 2
a, 2b, 4c, and 4d. Incidentally, reference numeral 18 in the drawing denotes a casing.

Here, the switching means 3 for selectively communicating the first and second two fixed chambers 2a and 2b of the fixed chamber member 2 and the first and second two switching chambers 4c and 4d of the switching chamber member 4 A butterfly type damper (plate) 9ac, which selectively opens and closes four communication holes 8ac, 8bc, 8ad, 8bd formed in a partition wall 7 for separating the fixed chamber member 2 and the switching chamber member 4 in the flow direction. It comprises 9bc, 9ad, 9bd and a drive mechanism for opening and closing them.
Although the drive mechanism is not particularly limited, for example, in the case of the present embodiment, the drive mechanism includes the switching shaft 10 and an actuator (not shown) for driving and rotating the switching shaft. The switching shaft 10 is rotatably accommodated in a cylindrical shaft holder 11 installed at a portion where the partition wall 7 and the partition wall 6 intersect. This shaft holder 11 has dampers 9ac, 9b
A window 12 having an angle slightly larger than the swing range of c, 9ad, 9bd is provided, and each damper 9ac, 9b is penetrated through the window 12.
c, 9ad, 9bd are fixed to the switching shaft 10 inside thereof by welding or the like.

In the case of the present embodiment, the dampers 9bc and 9bd are disposed in the first switching chamber 4c and the second switching chamber 4d of the switching chamber member 4, and the dampers 9ac and 9ad are disposed in the first fixed chamber of the fixed chamber member 2. Located at 2a. The dampers 9ac, 9ad and 9bc, 9bd are connected to the switching shaft 10 installed at the intersection of the partition 7 and the partition 6 with each other.
The sheets are fixedly combined so as to intersect with each other at an opening angle θ of, for example, about 150 ° to 90 °. In the case of the present embodiment, since the damper 9ac, 9ad and 9bc, 9bd are crossed with an opening angle θ of 150 ° in a butterfly type, one of the communication holes, for example, 8ac, 8bd is connected to the damper 9ac, 9bd. Damper 9ad, 9bc that closes the other communication hole 8ad, 8bc when closed with
Are arranged at an angle of 30 ° with respect to the partition wall 7 to open the communication holes 8ad and 8bc. Therefore, each of the dampers 9ac, 9bc, 9ad, 9bd is provided with a communication hole 8ac, 8bc, 8a of the partition wall 7.
Since it is arranged on the upstream side of the flow of d, 8bd, the communication holes 8ac, 8bc, 8ad, 8bd are always closed by receiving the pressure of the fluid.
In addition, since the pressure of the fluid is similarly received by the damper on the opposite side, it functions as a counterweight during the switching operation. For this reason, the switching operation of the damper can be smoothly and promptly performed with relatively light force. Although not shown, the dampers 9ac, 9bc, 9ad, 9bd or the communication holes 8ac, 8bc, 8a
It is preferable that a sealing material is fixed to the edges of d and 8bd to enhance airtightness.

The flow path switching device 1 configured as described above operates as follows. This operation will be described for the case where two systems, that is, an air supply system and an exhaust system, whose flow directions are reversed, are two systems of flow passages whose flow directions are fixed.

First, in the state of FIG. 1, when a relatively low-temperature fluid such as combustion air is introduced into the first fixed chamber 2a of the fixed chamber member 2, the combustion air passes through the communication hole 8ad and is switched to the switching chamber member. 4 flows into the second switching chamber 4d. Then, it is supplied to a use point, for example, a heat storage unit / burner, etc., through a flow path connected to the second switching chamber 4d. On the other hand, switching chamber member 4
The fluid introduced into the first switching chamber 4c, for example, the combustion exhaust gas that has passed through the regenerator flows into the fixed chamber 2b of the fixed chamber member 2 through the communication hole 8bc. Then, it is released into the atmosphere via a flow path connected to the fixed chamber 2b, for example, an exhaust duct.

Next, when the switching shaft 10 is rotated clockwise from the state shown in FIG. 1, the dampers 9ad, 9bc close the communication holes 8ad, 8bc and open the communication holes 8ac, 8bd. Then, the combustion air introduced into the first fixed chamber 2a of the fixed chamber member 2 flows through the communication hole 8ac above the first fixed chamber member 2a to the first chamber of the switching chamber member 4.
To the switching chamber 4c, and is supplied to the flow path connected to the chamber 4c. At this time, since the heat storage element installed in this flow path is heated by the waste heat of the combustion exhaust gas that has passed before switching, the supplied combustion air is preheated and supplied by receiving the heat of the heat storage element. You. On the other hand, the second fixed chamber 2b of the fixed chamber member 2
Then, the combustion exhaust gas flows from the second switching chamber 4d of the switching chamber member 4 through the lower communication hole 8bd. At this time, the other communication hole 8ad communicating with the second switching chamber 4d is closed by the damper 9ad. The combustion exhaust gas is exhausted after the waste heat is discarded into a heat storage body in a flow path connected to the second switching chamber 4d to become a relatively low-temperature gas.

FIG. 2 shows another embodiment. The passage switching device of this embodiment uses a rotating plate 13 that rotates or swings within a range of 90 ° as the switching means 3. In this embodiment, the positional relationship between the fixed chamber member 2 and the switching chamber member 4 is reversed from that of the embodiment shown in FIG. As shown in FIG. 2, the fixed chamber member 2 and the switching chamber member 4 are each partitioned in the flow direction by partition walls 14 and 15 which are orthogonal to the flow path, and further partitioned by partition walls 5 and 6 in the flow direction. Four communication holes 8ac, 8bc, 8a arranged in the four chambers 2a, 2b, 4c, 4d
d and 8bd are respectively opened. A rotating disk 13 is arranged between the partition wall 14 of the fixed chamber member 2 and the partition wall 15 of the switching chamber member 4. The rotating disk 13 has communication holes 8ac, 8bc, 8ad, provided in the fixed chamber member 2 and the switching chamber member 4.
Communication holes 16 and 17 are formed at two positions out of the positions corresponding to 8bd. These two communication holes 16 and 17 are opened at an interval of 180 °, and the first fixed chamber of the fixed chamber member 2 is formed.
2a and 2nd fixed room 2b and 1st change room of change room member 4
It is arranged at a position where it simultaneously communicates with both 4c and the second switching chamber 4d. Although not shown, the partition wall 14 and the rotating plate 13 are not shown.
It is preferable to arrange a seal member between the rotary plate 13 and the partition wall 15 to seal the space therebetween and partition the communication holes 8ac, 8bc, 8ad, 8bd from each other. For example, a slidable sealing material may be provided on each of the partition walls 14 and 15 in each of the communication holes 8ac, 8bc, 8
It is sufficient if the ad and 8bd are provided in the shape of a cross so as to partition each other, or provided in an X-shape on both the front and back surfaces of the rotating plate 13. Although not shown, the rotary plate 13 is provided with a rotation drive shaft at the center thereof so as to swing or rotate. In addition, a gear is formed on the outer peripheral surface of the rotating plate 13 and a driving pinion gear meshing with the gear is driven by an actuator such as a motor to rotate, or a roller or the like is pressed against the outer peripheral surface of the rotating plate 13 to rotate.

Therefore, as shown by the solid lines in FIG.
Is disposed, one of the two communication holes 8ac and 8ad formed in the first fixed chamber 2a of the fixed chamber member 2 is one of the communication holes 8ac.
Communicates with the communication hole 16 of the rotating plate 13 and also communicates with the communication hole 8ac provided in the first switching chamber 4c of the switching chamber member 4. On the other hand, one of the two communication holes 8bc and 8bd provided in the second fixed chamber 2b of the fixed chamber member 2 overlaps with the communication hole 17 of the rotary plate 13, and Second switching room 4d
The switching chamber member 4 overlaps with the lower communication hole 8bd provided in the
The second switching chamber 4d communicates with the second fixed chamber 2b of the fixed chamber member 2. At this time, the first fixed chamber 2a and the second switching chamber
The other communication hole 8ad of 4d and the other communication hole 8bc of the second fixed chamber 2b and the first switching chamber 4c are partitioned and shielded by the rotating plate 13, respectively. When the rotating plate 13 rotates 90 °, the second
The communication holes 16 and 17 move to the positions indicated by the broken lines in the figure, and the first fixed chamber 2a and the second switching chamber 4d communicate with each other, and the second fixed chamber 2b and the first switching chamber 4c communicate with each other, and the flow is established. Switch.

FIG. 3 shows another embodiment. In this embodiment, the partition walls 5, 6, and 7 of the flow path switching device shown in FIG.
The flow path can be switched by two butterfly type dampers, and the casing is formed by an X-shaped partition wall 50.
51 rooms are divided into 4 rooms. That is, the inside of the casing 51 is X
A first partition and a second lock, in which two opposing chambers, for example, chambers 52a and 52b are connected to two flow paths in which the flow direction of the fluid is fixed. And the other two opposing chambers, eg chamber 54
c and 54d are first and second switching chambers connected to two flow paths in which the flow direction of the fluid is alternately switched. Each side of the X-shaped partition wall 50 has two adjacent rooms 52a and 54c, 5
Communication holes 58ac, 58ad, 58bc, 58bd for communicating 2a and 54d, 52b and 54c, 52b and 54d, respectively, are perforated, and four chambers 5
2a, 52b, 54c, and 54d are mutually connected. X-shaped partition wall 50
At the intersection of, the communication holes 58ac, 58bc, 58
Switching means 53 including a damper 59 for closing bd and 58ad is provided. The switching means 53 includes a damper 59 disposed in the first fixed chamber 52a and a damper 59 disposed in the second fixed chamber 52b.
By rotating one of the communication holes 58ac or 58ad and 58bd or 58bc at the same time by rotating in the same direction by 57, the fixed chambers 52a and 52b and the partition 54
It is composed of a butterfly-type damper that simultaneously switches the connection relationship with c and 54d. A rotating shaft 57 that supports and rotates the damper 59 is rotatably supported by a bearing 56 near an intersection that is the center of the X-shaped partition wall 50. In the vicinity of the intersection of the X-shaped partition walls 50, there are provided partitions 55 that partition two opposing chambers, in this embodiment, a first fixed chamber 52a and a second fixed chamber 52b. The partition 55 is made of a plate-shaped sealing material that projects from the X-shaped partition wall 50 toward the center of the rotary shaft 57 so as not to hinder the rotation of the rotary shaft 57 and the damper 59. The rotating shaft 57 has a first fixed chamber.
The damper 59 occupying the inside of the second fixed chamber 52b and the damper 59 occupying the inside of the second fixed chamber 52b are brought into contact with the partition wall 50 in parallel with each other.
It is installed at intervals of degrees. In addition, each communication hole 58ac, 58ad, 58b
d and 58bc are provided at positions where the swing ends of the damper 59 are completely closed. The first and second fixed chambers 52a, 52b and the first and second switching chambers 54c, 54d each have a connecting pipe 60a, 60b, 60c for connecting a flow path one by one.
60d is provided. The first and second fixed chambers 52a and 52b are connected to two systems of flow paths (ducts) in which the flow direction of the fluid is fixed, respectively.
The switching chambers 54c and 54d are connected to two channels (ducts) in which the flow direction of the fluid is alternately switched. In addition, it is preferable that a sealing material is fixed to the edges of the damper 59 and the communication holes 58ac, 58ad, 58bd, 58bc to improve airtightness.

Channel switching by the channel switching device configured as described above is performed as follows. This operation will be described for the case where two systems, that is, an air supply system and an exhaust system, whose flow directions are reversed, are two systems of flow passages whose flow directions are fixed. For example, an air supply fluid, for example, low-temperature combustion air flows into the first fixed chamber 52a, while an exhaust fluid, for example, high-temperature combustion exhaust gas flows from the second fixed chamber 52b. In the illustrated state, the first fixed chamber 52
The fluid introduced into a flows into the first switching chamber 54c through the through hole 58ac of the partition wall 50, and is supplied to a location where air supply is required via a duct (not shown) connected to the first switching chamber 54c. You. On the other hand, the first switching chamber 5b is provided in the first fixed chamber 52b.
Exhaust fluid is sucked from an exhaust source or the like through a duct connected to 4d by an exhaust fan or the like of the exhaust system, introduced into the second switching chamber 54d, and then into the second fixed chamber through the communication hole 58bd. The air is discharged to the flow path / exhaust system connected to the same room 52b via the room 52b.

In the case of this flow path switching device, the two dampers 59 as the switching means 53 are rotated by one rotating shaft 57, so that the device is compact and the operation is simple. Further, since four chambers can be efficiently arranged in one casing 50, there is little waste of space.

FIG. 4 shows still another embodiment. The flow path switching device of this embodiment is a modification of the X-shaped partition wall in FIG. 3, and the inside of the casing 61 is substantially formed with the X-shaped partition wall by combining two Y-shaped partition walls 65a and 65b. The sealing structure between the chambers is improved while having the same configuration. That is, the two Y-shaped partition walls 65a and 65b are
7 are arranged in the axial direction and combined in the opposite directions, and Y
One of the three rooms partitioned by each partition 65a, 65b
One is separated from the other Y-shaped partition wall by a partition wall 66 so as to partition the inside of the casing 61 into four chambers as a whole. In the case of this embodiment, the inside of the casing 61 is divided into four chambers by partitioning the triangular portion above the Y-shaped partition wall 65a and the triangular portion below the Y-shaped partition wall 65b with the partition wall 66. The other chambers not partitioned by the partition wall 66 form one chamber each over the two Y-shaped partition walls 65a and 65b. The first and second fixed chambers connect two of the four chambers, that is, the chamber 62a and the chamber 62b in the present embodiment, to two flow paths in which the flow direction of the fluid is fixed. And Further, the remaining two chambers, that is, the chamber 64c and the chamber 64d in this embodiment, are first and second switching chambers connected to two flow paths in which the flow direction of the fluid is alternately switched. . These four chambers 62a, 62b, 62c, and 62d are respectively connected to two adjacent chambers by communication holes 68ac, 68ad, 68bc, and 68bd formed in the partition walls 65a and 65b. At the intersection of the Y-shaped partition walls 65a and 65b, communication holes 68ac, 68ad, 68bc
And a switching means 63 comprising a damper 69 for alternately closing the and 68bd. The switching means 63 has communication holes 68ac, 68ad, 68bc, 6
Damper 69 closing 8bd and rotating shaft 6 supporting and rotating it
It is composed of 7. The rotating shaft 67 has Y-shaped partition walls 65a and 65b.
Are arranged so as to penetrate a partition wall 66 that vertically partitions the two Y-shaped partition walls 65a and 65b in the vicinity of the intersection. The rotating shaft 67 has one of the chambers partitioned by Y-shaped partition walls 65a and 65b, and in this embodiment, the first and second fixed chambers 62a and 62.
One damper 69 arranged at b is attached.
In addition, it is preferable that a sealing material is fixed to the edges of the damper 68 and the communication holes 68ac, 68ad, 68bd, 68bc to improve airtightness.

The flow path switching by the flow path switching device thus configured is substantially the same as that in the embodiment of FIG. 3, and therefore the description thereof is omitted. In the case of this flow path switching device, two Y-shaped partition walls
Since the four chambers in the casing 61 are completely partitioned by 65a, 65b and the vertical partition wall 66, gas leakage between the two flow paths in the casing 61 can be further reduced as compared with the embodiment of FIG. .

The flow path switching device 1 configured as described above is used, for example, as follows. FIG. 5 illustrates an example of a regenerative alternating combustion system applied to a burner burning in a furnace. Of course, it is needless to say that the present invention can be applied to a burner that burns in a radiant tube.

This combustion system has a furnace body 21 provided with at least one set of regenerative burners 22 and 23. The heat storage burners 22, 23
Although the structure and the combustion system are not particularly limited, in the present embodiment, the combustion air system 27 that supplies combustion air and the combustion exhaust gas system 28 that discharges combustion gas are connected to the flow path switching device 1. The heat storage unit 25 and the wind box 24 can be selectively connected to each other through the heat storage unit 25 so as to supply combustion air and discharge combustion exhaust gas through the heat storage unit 25. In addition, as the heat storage body 25, a ceramic having a honeycomb structure in which a large number of through holes (cells) are provided in a longitudinal direction is used. Fuel nozzles 26, 26 for injecting fuel are provided in a burner throat portion of the wind box 24 near the furnace body 21.
Is buried. The fuel nozzles 26, 26 are provided so as to inject fuel from the inner peripheral surface of the refractory forming the burner throat, and are installed so that the fuel intersects the flow of combustion air flowing in the burner throat. ing. Further, the flue gas system 28 and the combustion air system 27 are, for example,
Or the flow path switching device 1 of the present invention exemplified in FIG.
Heat storage body 2 of one of the burners 22, 23 selectively
5 and the wind box 24. Then, for example, the combustion air supplied by the pushing fan 29 is supplied to the wind box 24, and at the same time, for example, the induction fan 30 draws the combustion gas from the non-combustion wind box 24 and discharges it to the atmosphere. Further, the fuel is selectively supplied to one of the burners 22, 23 via the three-way valve 33 of the fuel supply system 32. Reference numeral 34 in the drawing denotes an exhaust means for adjusting the furnace internal pressure and the like, which is provided as necessary.

Since it is configured as described above, the pair of regenerative burners 22 and 23 are alternately burned, and the combustion gas generated at that time is exhausted through the combustion exhaust gas system 28 of the unburned burner, and the regenerator If the waste heat of the flue gas is recovered at 25, the thermal economy will be extremely improved. In addition, combustion air preheated by using waste heat recovered in the heat storage unit 25 is supplied to the burner side that is burning. The combustion cycle of this burner is relatively short, e.g. 20 seconds to 90 seconds, preferably 20 seconds to 60 seconds.
Switching to seconds, most preferably about 40 seconds, is preferred for increasing the thermal efficiency. In this case, the maximum heat storage efficiency is obtained. Switching of the flow of combustion air and combustion exhaust gas
For example, the measurement is performed using a timer (not shown) or when the temperature of the combustion gas passing through the heat storage unit 25 is measured by a thermo sensor (not shown) and reaches a predetermined temperature. Such a short-time switching can be reliably realized by the flow path switching device 1 of the present invention illustrated in FIGS. 1 to 4 without causing the exhaust gas to leak.

In this embodiment, the flow path switching device 1 and the regenerative burner 2
2 and 23 are apart, but a pair of regenerative burners 22 and 23
If they are installed adjacently as shown in the figure, they can be installed directly below them. In this case, there is an advantage that the piping is extremely simple. Here, illustration of the fuel system is omitted in FIG. Furthermore, in the present embodiment, a combination of a pair of regenerative burners and a single flow path switching device has been mainly described. However, the present invention is not particularly limited to this.
Switching of combustion air and combustion exhaust gas to two or more pairs of regenerative burners may be performed by one flow path switching device.

FIG. 6 shows an embodiment of a heat exchange system using the flow path switching device of the present invention. In this embodiment, the system through which the fluid is exchanged is switched only at the portion where the heat exchange is performed, without basically changing the flow path of the fluid. 1 to 4
The channel switching device 1 illustrated in the figure is installed on the upstream side and the downstream side of the heat storage body 40, respectively, and the first switching chamber 4c and the second switching chamber 4c of the switching chamber member 4 of the channel switching device 1 on the upstream side are installed. The switching chamber 4d is connected to the heat storage element 40, and the first fixed chamber 2a and the second fixed chamber 2b of the fixed chamber member 2 of the flow path switching device 1 on the downstream side are firstly switched to the heat storage element 40 on the upstream side. The connection is made at a position facing the chamber 4c and the second switching chamber 4d. For example, an air supply pipe 41 is connected to one of the fixed chamber members 2 of the flow path switching device 1 on the upstream side, and a duct 42 of an exhaust system is connected to the other. Then, the first fixed chamber 2a of the fixed chamber member 2 of the flow passage switching device 1 on the downstream side is made to correspond to the first switching chamber 4c and the second switching chamber 4d of the switching chamber member 4.
And a second fixed chamber 2b. The heat storage material is stored in the first chamber 4c of the switching chamber member 4 of the downstream-side flow path switching device 1.
An air supply pipe 41 for supplying combustion air preheated by the heat of 40 to a boiler and the like, and a duct 42 of an exhaust system for exhausting high-temperature exhaust gas are connected to the second chamber 4d.
At this time, it is preferable to interpose a sealing material for sealing the periphery between each of the flow path switching devices 1, 1 and the heat storage body 40. Since the heat storage body 40 does not rotate, the seal between them is not particularly difficult. In addition, a partition between the first and second switching chambers 4c and 4d of the upstream channel switching device 1 that is in contact with the heat storage element 40 and the first and second fixed chambers 2a and 2b of the downstream channel switching device 1 are provided. It is preferable to provide a seal on the wall.

In the case of this heat storage type heat exchange system, by changing the flow path in the flow path switching device 1 on the upstream side, the fluid is allowed to pass through a region different from that previously passed by the heat storage body 40, and again on the downstream side. In the flow path switching device 1, the flow path is changed and returned to the original flow path, the flow path is switched only in the heat storage unit 40, and the gas is continuously changed without substantially changing the flow path in other places. Can be supplied to

With the above configuration, the air supplied from the air supply pipe 41 is supplied to, for example, the first switching chamber of the flow path switching device 1.
It is guided to the side 4c, passes through the left half of the heat storage element 40, receives heat from the heat storage element 40, becomes relatively high-temperature air, and is supplied into the fixed chamber 2a of the flow path switching device 1 on the downstream side. And the same device 1
Is supplied to the air supply pipe 41 from the first switching chamber 4c to supply hot air. This hot air is used, for example, as combustion air for a boiler or the like. Then, the combustion gas obtained by the combustion is introduced into the second switching chamber 4d of the flow path switching device 1 on the downstream side through the duct 42 of the exhaust system, passes through the second fixed chamber 2b of the device 1, and then stores the heat. The second switching chamber 4d and the second fixed chamber 2b of the flow path switching device 1 that passes through the right half of the body 40 and are located upstream.
Through the duct 42 of the exhaust system. At this time, the waste heat of the exhaust gas is recovered by the right half of the heat storage unit 40.

When the recovery of waste heat reaches a saturated state or when a predetermined switching time has been reached, the switching means 3 of the upstream and downstream flow path switching layers 1 and 1 is operated to switch each switching device 1. , 1 is switched. That is, the air supplied from the air supply pipe 41 is supplied to the first fixed chamber of the flow path switching device 1 on the upstream side.
The heat storage body 40 is guided from 2a to the second chamber 4d of the switching chamber member 4.
After passing through the right half of the
After being introduced into the fixed chamber 2b of the device 1,
It is guided to 4c and supplied from the air supply pipe 41 to a boiler or the like. At this time, in the air, the waste heat of the exhaust gas previously stored in the right half of the heat storage unit 40 is preheated. On the other hand, the combustion exhaust gas recovered from the boiler or the like is introduced into the second switching chamber 4d of the downstream flow path switching device 1 and then into the first fixed chamber of the switching device 1.
After passing through the 2a side and passing through the left half of the heat storage body 40 to heat it, it is guided to the first switching chamber 4c of the flow path switching device 1 on the upstream side. Thereafter, the gas is guided to the second fixed chamber 2b side of the switching device 1 and discharged into the atmosphere through the exhaust duct 42.

The above embodiments are one of the preferred embodiments, but are not limited thereto, and various modifications can be made without departing from the spirit of the present invention. For example, in this embodiment, the first and second fixed chambers 2a, 2
b and the first and second switching chambers 4c and 4d of the switching chamber member 4 are mainly described with reference to the embodiment on the assumption that one flow path is connected to each of the chambers. Instead, two or more flow paths may be connected to one chamber as long as the flow paths flow the same system of fluid. In short, as long as one channel is connected to one chamber, the number of channels may be plural. In the present embodiment, a relatively high-temperature gas and a low-temperature gas are mainly described as examples of the two-system fluid. However, the present invention is not particularly limited thereto. It can also be used for changing the flow path with a normal temperature fluid or switching the flow path between two fluids having different physical properties without a temperature difference. Further, in this embodiment, as two systems in which the direction of the fluid flow is fixed,
Although the description has been given by taking two systems, such as an air supply system and an exhaust system, whose flow directions are opposite to each other as an example, the present invention is not limited to this, and two systems in which fluid flows in the same direction may be used. In the heat storage type alternate combustion burner system, the heat storage element 25 may be directly connected to the first switching chamber 4c and the second switching chamber 4d, or the heat storage element 25 may be accommodated in each of the switching chambers 4c and 4d. You may. The same can be said for the respective embodiments shown in FIGS. Further, in the first to fourth embodiments, the communication holes 8bc, 8bd, 8ac, 8ad, 58ac, 58ad, 58bc, 58bd,
Each of 68ac, 68ad, 68bc, and 68bd is constituted by a single circular hole, but is not particularly limited thereto. The hole may have a shape other than a circle, for example, a hole such as a square or a triangle, or may be a group of many holes. A plurality of holes that are simultaneously opened and closed by one damper or a part of the disc are recognized as one hole.

Claims (5)

(57) [Claims] 1. A fixed chamber member divided by two fixed chambers connected to two flow paths in which the flow direction of a fluid is fixed, and a partition wall of the fixed chamber member is orthogonal to the partition wall. The flow direction of the fluid is alternately switched by the partition wall 2
A casing having a switching chamber member partitioned into two switching chambers connected to the flow path of the system, and a casing that partitions the fixed chamber member and the switching chamber member in the flow direction, and a partition wall in the flow direction of the casing. A communication hole that is perforated and communicates with one of the fixed chambers in an area where the two switching chambers overlap with each other and the other fixed chamber with the two switching chambers, and opens and closes the communication hole. A switching means for communicating one fixed chamber with one of the two switching chambers and communicating the other fixed chamber with the other switching chamber. 2. A flow path switching device according to claim 1, wherein said switching means is a butterfly type damper which alternately closes two communication holes existing in the same room. 3. The switching device according to claim 1, wherein said switching means is a rotary disk provided with through holes alternately opening two communication holes existing in the same room at intervals of 180 °. Channel switching device. 4. A combustion chamber system is connected to one of the two fixed chambers of the fixed chamber member of the flow path switching device according to claim 1, and an exhaust gas system is connected to the other chamber. A regenerator is connected to each of the two switching chambers of the member, and an alternate combustion type burner for supplying combustion air and discharging combustion gas through the regenerator is installed. A regenerative alternating combustion burner system, wherein the burners are alternately burned by air, and the combustion gas discharged from the non-burner is discharged through the flow switching device. 5. Two switching chambers connected to two flow paths in which the flow direction of the fluid is fixed and two switching chambers connected to two flow paths in which the flow direction of the fluid is alternately switched. And a casing in which two switching chambers are arranged adjacent to each of the fixed chambers, and two fixed switching chambers are arranged adjacent to each of the fixed chambers. A flow path switching device comprising: a communication hole to be communicated with each other; and switching means for opening and closing the communication hole to communicate one fixed chamber with one of the two switching chambers and communicate the other fixed chamber to the other switching chamber. Installed on the upstream side and the downstream side of the heat storage body, respectively, and after returning the flow of the fluid changed in the upstream side flow path switching device through the heat storage body, the flow is changed back in the downstream side flow switching device, The flow path is changed by the heat storage body. Regenerative heat exchange system for causing.