JP2003166711A - Fluid passage and flue gas control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress the fluid drift to a minimum even when a exhaust gas duct is largely bent. <P>SOLUTION: A fluid passage 21 comprises an upstream side passage 22 connected to a boiler 1 side and a downstream side passage 23 connected to a denitrizing device 2, an upper end of the upstream side passage 22 is connected to an upper end of the downstream passage 23 via a direction changing passage 24, and the flow passage is bent by 180° downwardly in the vertical direction. Since the width C1 of a center part of the direction changing passage 24 is set to be larger than the width. B1 of the downstream side passage 23, a separation part 25 is generated on the downstream 23 side, but not generated in the passage on the denitrizing device 2 side. The flow rate distribution is also reduced. Thus, the drift of the exhaust gas to the denitrizing device 2 side is suppressed, and degradation of the denitrizing performance or the like is prevented. In addition, no member is present inside the fluid passage 21, and no pressure losses are caused, and no foreign matters such as ashes are deposited therein. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid passage for allowing a fluid to flow therethrough, and more particularly to a fluid passage at a portion whose direction is largely changed.

[0002]

2. Description of the Related Art For example, in a thermal power plant or the like, a flue gas treatment device such as a denitration device or a desulfurization device is provided for removing air pollutants when exhaust gas emitted from combustion in a boiler is discharged. There is. In thermal power plants and the like, in order to arrange various devices in a limited space, a fluid passage (gas duct) through which exhaust gas flows is often bent at a right angle or an angle of 180 degrees. If the gas duct is greatly bent, the exhaust gas may be biased to the outside of the bend, and a separation region may be generated on the inside to cause a part of the flow to stay.

[0003]

In the conventional gas duct, it is considered to suppress uneven flow by providing a resistance member in the passage so as to give the exhaust gas a flow resistance or by installing guide vanes. However, when installing a flue gas treatment device in an existing facility or when minimizing the installation space, it is necessary to increase the bending of the gas duct.If the gas duct is greatly bent, simply install a resistance member. It was the current situation that uneven flow could not be sufficiently suppressed simply by installing guide vanes.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a fluid passage capable of sufficiently suppressing uneven flow of fluid even when the flow path is largely bent. .

Further, the present invention has been made in view of the above situation, and is provided with a fluid passage capable of sufficiently suppressing the drift of exhaust gas even when the flow path on the inlet side is largely bent. An object of the present invention is to provide an exhaust gas treatment device.

[0006]

In order to achieve the above object, the structure of the fluid passage of the present invention is such that, in the fluid passage in which the upstream passage and the downstream passage are connected by the passage, the width of the passage is changed. Is characterized in that the width of the downstream passage is made wider to suppress the separation of the fluid on the direction-changing inner peripheral side of the downstream passage.

Further, the structure of the fluid passage of the present invention for achieving the above object is such that, in the fluid passage in which the upstream passage and the downstream passage are connected by the direction changing passage, the width gradually increases at the inlet of the downstream passage. Is formed to suppress the separation of the fluid on the inner peripheral side of the direction change of the downstream passage.

Further, the divergence angle of the wide portion on the inner circumferential side of the direction change of the fluid is formed to be smaller than the divergence angle of the wide portion on the outer circumferential side of the direction change. Further, it is characterized in that a guide member for guiding the fluid in the spreading direction of the wide portion is provided on the inner peripheral side of the direction change of the fluid on the inlet side of the wide portion.

Further, in the structure of the fluid passage of the present invention for achieving the above object, in the fluid passage in which the upstream passage and the downstream passage are connected by the direction changing passage, the fluid is supplied to the outlet portion of the upstream passage. It is characterized in that a guide member for guiding to the direction-changing outer circumference side is provided to suppress fluid separation on the direction-changing inner circumference side of the downstream passage.

The guide member is provided with an angle changing mechanism for changing the direction change angle of the fluid.

Further, the structure of the fluid passage of the present invention for achieving the above object is such that, in the fluid passage in which the upstream passage and the downstream passage are connected by the passage, the passage is bent along the curved passage. A guide member that guides the fluid is provided, and a circulation portion that allows the fluid to flow on both sides of the guide member is formed on the downstream side of the guide member to suppress fluid separation on the direction change inner peripheral side of the downstream passage. And

The fluid passage is a gas duct.

In order to achieve the above object, the structure of the flue gas treatment apparatus of the present invention comprises a catalyst means for purifying exhaust gas of a boiler in a thermal power generation facility, wherein the downstream side passage of the fluid passage according to claim 8 is used. It is characterized by being equipped on the upstream side.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a schematic configuration of a denitration device equipped with a fluid passage (gas duct) according to an embodiment of the present invention, and FIG. 2 is a fluid passage according to an embodiment of the present invention ( 1 shows a schematic configuration of a desulfurization device including a gas duct).

As shown in FIG. 1, for example, in a boiler 1 for generating steam for driving a steam turbine (not shown) of a thermal power generation facility, fuel f such as coal or heavy oil is burned in a furnace. There is. Exhaust gas from the boiler 1 is sent through a gas duct 11 to a denitration device 2 as a flue gas treatment device, flows through a catalyst means 3 of the denitration device 2, is denitrified, and is sent to a gas gas heater (not shown), a dust collector, a desulfurization device, etc. Emitted from 4 to the atmosphere.

Further, as shown in FIG. 2, the exhaust gas of the boiler 1 is denitrified by a denitration device (not shown) and then sent to a desulfurization device 5 as a smoke treatment device through a gas gas heater (not shown) and a dust collector through a gas duct 12. Then, it flows through the catalyst means 6 of the desulfurization device 5, is desulfurized, and is discharged from the stack 4 to the atmosphere. In the figure, reference numeral 7 is a dilute sulfuric acid stored in the lower portion of the desulfurization device 5, and 8 is a sulfuric acid tank for storing the dilute sulfuric acid of the desulfurization device 5.

The denitration device 2 and the desulfurization device 4 are installed together or separately.

The gas duct 11 of the denitration device 2 is shaped so that exhaust gas sent from below is bent 180 degrees and introduced downward into the denitration device 2 due to restrictions such as installation height. In addition, the gas duct 12 of the desulfurization device 5 is designed so that the exhaust gas sent from above is not exhausted from above due to restrictions such as installation height.
The shape is such that it is bent by 80 degrees and is introduced upward into the desulfurization device 4.

An embodiment of the gas duct described above will be described with reference to FIGS. 3 to 8.

FIG. 3 is a cross section of the fluid passage (gas duct) according to the first embodiment of the present invention, FIG. 4 is a cross section of the fluid passage (gas duct) according to the second embodiment of the present invention, FIG.
FIG. 6 is a cross section of the fluid passage (gas duct) according to the third embodiment of the present invention, FIG. 7 is a cross section of the fluid passage (gas duct) according to the fourth embodiment of the present invention, and FIG. 8 is the present invention. 7 is a sectional view of a fluid passage (gas duct) according to the fifth embodiment of FIG.

A first embodiment of the fluid passage (gas duct) will be described with reference to FIG.

As shown in the figure, the fluid passage 21 (corresponding to the gas ducts 11 and 12) is on the boiler 1 side (see FIGS. 1 and 2).
Upstream passage 22 and the denitration device 2 (see FIG. 1)
Alternatively, the downstream passage 23 connected to the desulfurization device 5 (see FIG. 2) is provided, and the upper end of the upstream passage 22 and the downstream passage 23 are provided.
The upper end of the flow path is connected by the direction change passage 24 so that the flow path is from upward to downward (in the case of the desulfurization device 5, downward to upward).
It is bent 180 degrees. Therefore, the exhaust gas can be introduced from the upper part of the denitration device 2 (the lower part of the desulfurization device 5) in a small space.

The width A1 of the upstream passage 22 and the downstream passage 23
B1 are set to be substantially equal to each other, and the width C1 of the central portion of the direction changing passage 24 is set to be larger than the width B1 of the downstream passage 23 (for example, B1 = 3C1). When the exhaust gas is bent 180 degrees in the direction changing passage 24 and flows, the exhaust gas on the inner peripheral side is deflected toward the outer peripheral side due to the influence of the centrifugal force, and the separation portion 25 is formed on the inner peripheral side. It is conceivable that the peeling portion 25 causes a pressure loss and causes a non-uniform flow in the exhaust gas on the downstream side to deteriorate the performance of denitration and desulfurization.

In the present embodiment, since the width C1 of the central portion of the direction changing passage 24 is set to be larger than the width B1 of the downstream passage 23, the peeling portion 24 is generated on the downstream passage 23 side and the denitration device is formed. 2 (desulfurization device 5) side passage does not occur.
The flow velocity distribution is also small. That is, the separation of the exhaust gas on the inner circumferential side of the direction change of the downstream passage 23 is suppressed. Therefore, the uneven flow of the exhaust gas to the side of the denitration device 2 (desulfurization device 5) is suppressed, and it is possible to prevent the performance deterioration of denitration and desulfurization. Further, since there is no member inside the fluid passage 21, no pressure loss occurs and foreign matter such as ash does not accumulate.

Incidentally, the width C of the central portion of the direction changing passage 24
1 and the width A1 of the upstream side passage 22 and the width B1 of the downstream side passage 23 are substantially equal to each other, the situation of separation and the situation of flow velocity distribution are shown. However, compared with the embodiment example shown by the solid line, The peeling portion is generated even in a portion on the side of the denitration device 2 (desulfurization device 5), and the flow velocity distribution is also large.

Therefore, in the above-described fluid passage 21, even if the flow path is largely bent, it is possible to sufficiently suppress the drift of the exhaust gas without pressure loss.

A second embodiment of the fluid passage (gas duct) will be described with reference to FIG.

As shown in the figure, the fluid passage 26 (corresponding to the gas ducts 11 and 12) is on the boiler 1 side (see FIGS. 1 and 2).
Upstream passage 27 and the denitration device 2 (see FIG. 1)
Alternatively, the downstream passage 28 connected to the desulfurization device 5 (see FIG. 2) is provided, and the upper end of the upstream passage 27 and the downstream passage 28 are provided.
The upper end of the flow path is connected by the direction change passage 29 so that the flow path is from upward to downward (in the case of the desulfurization device 5, downward to upward).
It is bent 180 degrees. Therefore, the exhaust gas can be introduced from the upper part of the denitration device 2 (the lower part of the desulfurization device 5) in a small space.

The width B2 of the downstream passage 28 and the direction changing passage 2
The width C2 of the central portion of 9 is set to be substantially equal,
A kicker 30 as a guide member for guiding the exhaust gas to the outside of the direction change is provided on the inner peripheral side of the outlet portion of 7, and the upper surface 30a of the kicker 30 is inclined to the outside of the direction change. Upstream passage 2
The outer peripheral side of 7 is a wide portion 27a formed at an angle substantially equal to the upper surface 30a of the kicker 30. The wide portion 27
It is not always necessary to provide a.

When the exhaust gas is bent 180 degrees in the direction conversion passage 29 and flows, the exhaust gas on the inner peripheral side is deflected toward the outer peripheral side due to the influence of the centrifugal force, and the separation portion 20 is formed on the inner peripheral side. It is conceivable that the peeling section 20 causes a pressure loss and causes a non-uniform flow in the exhaust gas on the downstream side to deteriorate the performance of denitration and desulfurization.

In this embodiment, the wide portion 27a is provided on the outer peripheral side of the upstream passage 27, and the exhaust gas is guided to the outside of the direction change by the kicker 30, so that the peeling portion 20 is provided immediately after the kicker 30. Occurs in the direction change passage 29 and does not occur in the downstream passage 29 on the side of the denitration device 2 (desulfurization device 5). That is, the exhaust gas is suppressed from being separated on the inner circumferential side of the downstream passage 29 where the direction is changed. Therefore, the uneven flow of the exhaust gas to the side of the denitration device 2 (desulfurization device 5) is suppressed, and it is possible to prevent the performance deterioration of denitration and desulfurization. Further, since the width B2 of the downstream passage 28 and the width C2 of the central portion of the direction changing passage 29 are made substantially equal to each other, it is possible to reduce the vertical space.

Therefore, in the above-described fluid passage 26, even if the flow passage is largely bent, it is possible to sufficiently suppress the drift of the exhaust gas with a small vertical space.

A third embodiment of the fluid passage (gas duct) will be described with reference to FIGS. 5 and 6. In the present embodiment, the kicker 1 has a variable angle with respect to the kicker 30 shown in FIG.
9 is provided.

As shown in the figure, the fluid passage 31 (corresponding to the gas ducts 11 and 12) is on the boiler 1 side (see FIGS. 1 and 2).
Upstream passage 32 connected to the denitrification device 2 (see FIG. 1)
Alternatively, the downstream passage 33 connected to the desulfurization device 5 (see FIG. 2) is provided, and the upper end of the upstream passage 32 and the downstream passage 33 are provided.
The upper end of the flow path is connected by the direction change passage 34 so that the flow path is from upward to downward (in the case of the desulfurization device 5, downward to upward).
It is bent 180 degrees. Therefore, the exhaust gas can be introduced from the upper part of the denitration device 2 (the lower part of the desulfurization device 5) in a small space.

A kicker 19 as a guide member for guiding the exhaust gas to the outside of the direction change is provided on the inner peripheral side of the outlet of the upstream passage 32, and the kicker 19 is a guide plate 18 and a guide plate 18 which can be inclined to the outside of the direction change. And a link 17 for inclining. That is, the tip end of the link 17 is rotatably supported by the side portion of the guide plate 18, and the base end of the link 17 is positionally movable along the elongated hole 16. By moving the base end of the link 17 and fixing it at a predetermined position, the guide plate 18 can be adjusted to an arbitrary angle (angle changing mechanism). Note that the inclination angle of the guide plate 18 is adjusted and fixed at an optimum position for each shape of the duct, but can be changed at any time according to fluctuations in the flow rate of exhaust gas.

When the exhaust gas is bent 180 ° in the direction changing passage 34 and flows, the flow of the exhaust gas on the inner peripheral side is biased toward the outer peripheral side due to the influence of the centrifugal force, and a separation portion is formed on the inner peripheral side. It is conceivable that the exfoliation part causes a pressure loss, and a non-uniform flow occurs in the exhaust gas on the downstream side to deteriorate the performance of denitration and desulfurization.

In this embodiment, the peeling portion is formed in the direction change passage 34 immediately after the kicker 19 and is not formed in the downstream passage 33 on the side of the denitration device 2 (desulfurization device 5). That is, the exhaust gas is suppressed from being separated from the inner circumferential side of the downstream passage 33 where the direction is changed. Therefore, the uneven flow of the exhaust gas to the side of the denitration device 2 (desulfurization device 5) is suppressed, and it is possible to prevent the performance deterioration of denitration and desulfurization.

The width C of the central portion of the direction changing passage 34 is
When 3 is small (see the dotted line in FIG. 5), by increasing the inclination angle of the guide plate 18 (see FIG. 5), the downstream passage 33
Exfoliation of the exhaust gas on the inner circumferential side of the direction change can be suppressed. Further, when the width C3 of the central portion of the direction changing passage 34 is large, the inclination angle of the guide plate 18 is made small (see FIG. 6) to suppress the separation of the exhaust gas on the inner side of the direction changing passage of the downstream side passage 33. can do.

Therefore, in the above-described fluid passage 26, even if the flow passage is largely bent, it is possible to sufficiently suppress the drift of the exhaust gas in a state corresponding to the duct shape.

A fourth embodiment of the fluid passage (gas duct) will be described with reference to FIG.

As shown in the figure, the fluid passage 36 (corresponding to the gas ducts 11 and 12) is on the boiler 1 side (see FIGS. 1 and 2).
Upstream passage 37 and the denitration device 2 (see FIG. 1)
Alternatively, the downstream passage 38 connected to the desulfurization device 5 (see FIG. 2) is provided, and the upper end of the upstream passage 37 and the downstream passage 38 are provided.
The upper end of the flow path is connected by the direction change passage 39 so that the flow path is from upward to downward (in the case of the desulfurization device 5, downward to upward).
It is bent 180 degrees. Therefore, the exhaust gas can be introduced from the upper part of the denitration device 2 (the lower part of the desulfurization device 5) in a small space.

A wide portion 40 having a gradually increasing width is formed at the inlet of the downstream passage 38, that is, the inlet of the downstream passage 38 has a narrow width. The divergence angle α (for example, 30
Is smaller than the spread angle β (for example, 45 degrees) of the wide portion 40b on the outer circumferential side of the direction change of the exhaust gas. The numerical values of the spread angles α and β are examples, and α <
Any relationship of β will do.

Further, an outlet guide vane 41 for guiding the exhaust gas in a bending direction is provided on the inner circumferential side of the exhaust gas in the outlet side of the upstream passage 37 where the direction of the exhaust gas is changed. Also,
An inlet guide vane 42 as a guide member that guides the exhaust gas in the spreading direction of the wide portion 40a is provided on the inner circumferential side of the exhaust gas at the inlet side of the wide portion 40.

When the exhaust gas is bent 180 degrees in the direction changing passage 39 and flows, the exhaust gas on the inner peripheral side is deflected toward the outer peripheral side due to the influence of the centrifugal force, and a separation portion is formed on the inner peripheral side. It is conceivable that the exfoliation part causes a pressure loss, and a non-uniform flow occurs in the exhaust gas on the downstream side to deteriorate the performance of denitration and desulfurization.

In this embodiment, an outlet guide vane 41 is provided on the outlet side of the upstream passage 37, and an inlet guide vane 42 for guiding exhaust gas in the widening direction of the wide portion 40a is provided on the inlet side of the wide portion 40. In addition, the width of the inlet portion of the downstream passage 38 is made narrower, and further, the spread angle α of the wide portion 40a on the inner circumferential side of the exhaust gas direction change is wider than that of the wide portion 40b on the outer side of the exhaust gas direction change. Since it is formed smaller than the angle β, no peeling portion is formed on the inner peripheral side of the direction changing passage 39. That is,
Exfoliation of the exhaust gas on the inner circumferential side of the downstream passage 39 in the direction change is suppressed. Therefore, the uneven flow of the exhaust gas to the side of the denitration device 2 (desulfurization device 5) is suppressed, and it is possible to prevent the performance deterioration of denitration and desulfurization.

Therefore, in the above-described fluid passage 36, it is possible to sufficiently suppress the drift of the exhaust gas even when the passage is largely bent.

A fifth embodiment of the fluid passage (gas duct) will be described with reference to FIG.

As shown in the figure, the fluid passage 46 (corresponding to the gas ducts 11 and 12) is on the boiler 1 side (see FIGS. 1 and 2).
Upstream passage 47 connected to the NOx removal device 2 and the denitration device 2 (see FIG. 1)
Alternatively, the downstream passage 48 connected to the desulfurization device 5 (see FIG. 2) is provided, and the upper end of the upstream passage 47 and the downstream passage 48 are provided.
The upper end of the flow path is connected by the direction change passage 49 so that the flow path is from upward to downward (in the case of the desulfurization device 5, downward to upward).
It is bent 180 degrees. Therefore, the exhaust gas can be introduced from the upper part of the denitration device 2 (the lower part of the desulfurization device 5) in a small space.

A guide vane 50 serving as a guide member for guiding the exhaust gas along the curved state of the passage is provided on the inner peripheral side of the direction changing passage 49, and a plurality of holes serving as circulation portions are provided on the downstream side of the guide vane 50. 51 is provided, and the exhaust gas can freely flow through the holes 51 on both sides of the guide vane 50.

When the exhaust gas is bent 180 degrees in the direction changing passage 49 and flows, the exhaust gas on the inner peripheral side is biased toward the outer peripheral side due to the influence of the centrifugal force, and a separation portion is formed on the inner peripheral side. It is conceivable that the exfoliation part causes a pressure loss, and a non-uniform flow occurs in the exhaust gas on the downstream side to deteriorate the performance of denitration and desulfurization.

In the present embodiment, since the guide vanes 50 are provided on the inner peripheral side of the direction changing passage 49, the exhaust gas flowing on the inner peripheral side is not affected by the centrifugal force. Further, since the holes 51 are provided on the downstream side of the guide vanes 50, when a separating action occurs at the parts of the guide vanes 50, the exhaust gas flows through the holes 51 and moves to the outside, and the parts of the guide vanes 50 are formed. No peeling occurs. That is, the exhaust gas is suppressed from being separated on the inner circumferential side of the downstream passage 39 where the direction is changed. Therefore, the uneven flow of the exhaust gas to the side of the denitration device 2 (desulfurization device 5) is suppressed, and it is possible to prevent the performance deterioration of denitration and desulfurization.

Therefore, in the above-mentioned fluid passage 36, it is possible to sufficiently suppress the drift of the exhaust gas even when the passage is largely bent.

In the above-mentioned embodiment, the gas duct connected to the smoke treatment device is taken as an example of the fluid passage, but the fluid passage is provided with a direction for guiding steam to equipment such as a heat exchanger. The present invention can be applied to a passage for converting, a passage for changing the direction for guiding water to a device such as a cooler, and the like.

[0054]

According to the fluid passage of the present invention, in the fluid passage in which the upstream passage and the downstream passage are connected by the passage, the width of the passage is made wider than that of the downstream passage. Since the separation of the fluid on the inner circumferential side of the direction change of the side passage is suppressed, even if the flow path is largely bent, it is possible to sufficiently suppress the drift of the fluid without pressure loss. .

Further, in the fluid passage of the present invention, in the fluid passage in which the upstream passage and the downstream passage are connected by the direction changing passage, a wide portion having a gradually increasing width is formed at the inlet portion of the downstream passage. Since the separation of the fluid on the inner circumference side of the direction change of the downstream passage is suppressed, it is possible to sufficiently suppress the drift of the fluid without pressure loss even when the flow path is greatly bent. Become.

Further, since the spread angle of the wide portion on the inner side of the direction change of the fluid is formed smaller than the spread angle of the wide section on the outer side of the direction change, separation of the fluid on the inner side can be suppressed. It will be possible.

Further, the change of the direction of the fluid on the inlet side of the wide portion Since the guide member for guiding the fluid in the expanding direction of the wide portion is provided on the inner peripheral side, the separation of the fluid on the inner peripheral side can be surely suppressed. It will be possible.

Further, in the fluid passage of the present invention, in the fluid passage in which the upstream passage and the downstream passage are connected by the direction changing passage, a guide member for guiding the fluid to the direction changing outer peripheral side is provided at the outlet of the upstream passage. Since the separation of the fluid on the inner circumferential side of the direction change of the downstream passage provided is suppressed, it is possible to sufficiently suppress the drift of the fluid without enlarging the passage even if the flow path is greatly bent. become.

Since the guide member is provided with the angle changing mechanism for changing the direction change angle of the fluid, it is possible to sufficiently suppress the drift of the fluid according to the shape of the passage.

Further, in the fluid passage of the present invention, in the fluid passage in which the upstream passage and the downstream passage are connected by the direction changing passage, a guide member for guiding the fluid along the curved state is provided in the direction changing passage and is guided. In the case where the flow path is largely bent, the flow passage is formed on both sides of the guide member on the downstream side of the member to suppress the separation of the fluid on the inner circumferential side of the direction change of the downstream passage. Even if there is separation, it is possible to sufficiently suppress the drift of the fluid without separation.

Since the fluid passage is a gas duct,
Even if the flow path is greatly bent, it is possible to sufficiently suppress the gas drift.

In the flue gas treatment apparatus of the present invention, the downstream passage of the fluid passage according to claim 8 is provided on the upstream side of the catalyst means for purifying the exhaust gas of the boiler in the thermal power generation facility. Even if the flow path to the chamber is greatly bent, it is possible to sufficiently suppress the drift of the exhaust gas and improve the smoke exhaust treatment performance.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a denitration device including a fluid passage (gas duct) according to an embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of a desulfurization device including a fluid passage (gas duct) according to an embodiment of the present invention.

FIG. 3 is a sectional view of a fluid passage (gas duct) according to the first embodiment of the present invention.

FIG. 4 is a sectional view of a fluid passage (gas duct) according to a second embodiment of the present invention.

FIG. 5 is a sectional view of a fluid passage (gas duct) according to a third embodiment of the present invention.

FIG. 6 is a sectional view of a fluid passage (gas duct) according to a third embodiment of the present invention.

FIG. 7 is a sectional view of a fluid passage (gas duct) according to a fourth embodiment of the present invention.

FIG. 8 is a sectional view of a fluid passage (gas duct) according to a fifth embodiment of the present invention.

[Explanation of symbols]

1 boiler 2 Denitration equipment 3,6 catalytic means 4 chimney 5 Desulfurization equipment 7 dilute sulfuric acid 8 Sulfuric acid tank 11,12 gas duct 16 long holes 17 links 18 Information board 19,30 kicker 20, 25 peeling section 21,26,31,36,46 Fluid passage 22, 27, 32, 37, 47 Upstream passage 23, 28, 33, 38, 48 Downstream passage 24,29,34,39,49 Direction change passage 40 wide part 41 Exit guide vane 42 entrance guide vane

Continued front page    F term (reference) 3K070 DA02 DA03 DA22 DA23 DA25                       DA66 DA73                 4D048 AA02 AA06 CA03 CC22 CC25

Claims (9)

[Claims] 1. In a fluid passage in which an upstream passage and a downstream passage are connected by a diversion passage, the width of the diversion passage is made wider than that of the downstream passage, and the diversion inner circumference of the downstream passage is formed. A fluid passage that suppresses fluid separation on the side. 2. In a fluid passage in which an upstream passage and a downstream passage are connected by a direction changing passage, a wide portion having a gradually widening is formed at an inlet portion of the downstream passage to form a direction change inside the downstream passage. A fluid passageway characterized by suppressing fluid separation on the circumferential side. 3. The fluid passage according to claim 2, wherein a widening angle of the wide portion on the inner side of the direction change of the fluid is formed smaller than a widening angle of the wide portion on the outer side of the direction change. 4. The fluid passage according to claim 2, wherein a guide member for guiding the fluid in the expanding direction of the wide portion is provided on the inner peripheral side of the fluid direction change on the inlet side of the wide portion. . 5. A fluid passage in which an upstream passage and a downstream passage are connected by a diversion passage, a guide member for guiding a fluid to the diversion outer peripheral side is provided at an outlet portion of the upstream passage, and the diversion of the downstream passage is formed. A fluid passage characterized by suppressing fluid separation on the inner peripheral side. 6. The fluid passage according to claim 5, wherein the guide member is provided with an angle changing mechanism for changing the direction change angle of the fluid. 7. A fluid passage, in which an upstream passage and a downstream passage are connected by a direction changing passage, is provided with a guide member for guiding the fluid along the curved state in the direction changing passage, and the guide member is provided downstream of the guide member. A fluid passage, characterized in that a fluid passage portion is formed on both sides of the member to prevent fluid from being separated on the direction change inner peripheral side of the downstream passage. 8. The fluid passage according to any one of claims 1 to 7, wherein the fluid passage is a gas duct. 9. A flue gas treatment apparatus comprising the downstream passage of the fluid passage according to claim 8 on the upstream side of a catalyst means for purifying exhaust gas of a boiler in a thermal power generation facility.