JPH11325432A - Structure of flue - Google Patents

Abstract

PROBLEM TO BE SOLVED: To uniformize flow speed distribution of a rising waste gas flow at an inlet of a rising flue section in a flue where there is disposed a heating pipe line in the rising flue section for heating a fluid. SOLUTION: There is provided upstream a heating pipe line 21 a waste gas flow adjusting plate 1 capable of altering and adjusting a position or an attitude so as for flow speed distribution of waste gas at a disposition position of a heating pipe line 21 to be purpose distribution. Herein, for an attitude adjusting mechanism of a waste gas flow adjusting plate 1 the waste gas flow adjusting plate 1 may be constructed rockably around a lateral axis core P, and the waste gas flow adjusting plate 1 may be divided into upper and lower portions of the lateral axis core P to permit the divided upper and lower adjusting plates to be adjustable in a relative angle.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a flue, and more particularly, to a flue for guiding exhaust gas downward to a flue for guiding an exhaust gas flow from a waste heat treatment furnace, and the descending flue. A heating duct for heating a fluid in the rising flue section, comprising a flue bend section for deflecting the exhaust gas flow from the upper section upward, and a rising flue section for guiding the exhaust gas from the flue bending section upward. Related to the structure of the stack.

[0002]

2. Description of the Related Art Conventionally, for example, in a waste incinerator, when a waste heat boiler is provided at a secondary combustion chamber outlet flue of the incinerator as shown in FIG. 10, a descending flue section 11 for guiding the exhaust gas passing between the pipes of the waste heat boiler downward, and the descending flue section 1
The flue gas flow S from the exhaust gas flow S is deflected upward, and the flue gas from the flue gas curved portion 12 is constituted by a rising flue portion 13 for guiding the flue gas upward. As a heating pipe for heating the fluid, a flue structure in which a superheater pipe 21 for heating steam from the waste heat boiler is generally employed.

[0003]

FIG. 12 shows the locus of the exhaust gas flow S in the flue 10 having the above-mentioned structure by a simulator. The length of the arrow indicates the level of the flow velocity. When the descending exhaust gas flow is deflected in the section 12, the exhaust gas flow S that separates at the partition lower end 14a of the partition 14 between the descending flue section 11 and the ascending flue section 13 faces the partition 14 due to the inertia of the descending flow. The flow velocity of the exhaust gas is lower in a region close to the partition wall 14 than in the superheater pipe 21 arranged above the wall 15, and the flow velocity in the position close to the opposing wall 15 is increased. Is generated, a flow distribution is deviated in the ascending gas flow Su passing through the superheater conduit 21, and in the region near the partition 14, the flow velocity of the ascending gas flow Su is low. Before This causes deposition of dust such as fly ash on the superheater line 21 and corrosive gas components mainly containing chlorine in the exhaust gas are absorbed by the moisture contained in the adhering dust, so that the superheater line 21 However, there is a problem in that corrosion of the outer wall of the tube is caused by corrosive moisture. On the side of the opposing wall 15, the flow velocity of the rising gas flow Su becomes high, so that heat transfer to the superheater pipe 21 becomes excessive, and as a result, the pipe wall temperature of the superheater pipe 21 is increased. As the temperature rises to reach the high-temperature corrosion temperature range, there is also a problem that high-temperature corrosion of the outer wall of the tube is easily caused. For this purpose, the rising gas flow Su
As a result, it is necessary to suppress the average temperature of the superheated steam to such an extent that the high-temperature corrosion can be prevented.As a result, the temperature of the superheated steam at the outlet of the superheater cannot be increased, and the power generation efficiency by the steam from the waste heat boiler cannot be maintained high. Had. Therefore, in order to protect the pipe wall of the superheater pipe line 21, it is important to adjust the flow velocity distribution of the rising gas flow Su. Therefore, the structure of the flue of the present invention solves the above-mentioned problems, and provides a structure of the flue that makes it possible to adjust the flow velocity distribution of the exhaust gas along the duct of the heating duct arranged in the rising flue. The purpose is to do.

[0004]

[Means for Solving the Problems] The first feature of the structure of the flue according to the present invention for the above purpose is as described in claim 1, wherein the structure is provided on the upstream side of the heating pipe. The present invention is characterized in that an exhaust gas flow adjusting plate whose position or attitude can be changed and adjusted is provided so that the exhaust gas flow velocity distribution at the arrangement position of the heating pipe line becomes the target distribution.

According to a second aspect of the present invention, as the attitude adjusting mechanism of the exhaust gas flow adjusting plate in the first characteristic configuration, it is sufficient if the exhaust gas flow adjusting plate is configured to be swingable about a horizontal axis. (2nd feature configuration), As described in claim 3, it is even better if the exhaust gas flow adjusting plate in the first or second feature configuration is formed so as to be vertically adjustable so that the relative angle can be adjusted (third feature configuration). The first to third aspects as described in claim 4.
It is more preferable that the exhaust gas flow adjusting plate in any one of the characteristic configurations is divided into a plurality of parts in the direction of the horizontal axis (fourth characteristic configuration), and the first to fourth characteristic configurations as described in claim 5. It is more preferable that a plurality of exhaust gas flow control plates in any one of the above is provided and arranged with different horizontal axis cores (fifth characteristic configuration). In addition, as described in claim 6, while providing a flow velocity measuring means for detecting a flow velocity distribution of exhaust gas flowing between the heating pipes in any of the first to fifth characteristic configurations,
It is further preferable that a rectifying plate control mechanism for changing and adjusting the position or the attitude of the exhaust gas flow adjusting plate based on the detection result of the flow velocity measuring means is provided (sixth characteristic configuration). Here, claim 7
As described in the above, the flow rate measuring means in the sixth characteristic configuration, a plurality of temperature measuring means for detecting the pipe wall temperature of the heating pipe is provided along the heating pipe, and detected by the temperature measuring means. It is more preferable that the flow rate distribution of the exhaust gas is detected from the temperature distribution obtained (seventh characteristic configuration).

[Function and effect of each characteristic configuration] According to the above-mentioned first characteristic configuration, the temperature distribution of the heating pipe can be adjusted to a desired distribution. That is, since the exhaust gas flow adjusting plate whose position or posture can be changed and adjusted is provided on the upstream side of the heating pipe, the exhaust gas flow from the descending flue section is dispersed and rectified by the exhaust gas flow adjusting plate. Therefore, by changing and adjusting the position or the attitude of the exhaust gas flow adjusting plate, the flow velocity distribution of the exhaust gas at the arrangement position of the heating pipe can be adjusted to be the target distribution.

According to the second aspect, the flow velocity distribution in the first aspect can be adjusted by simple means. In other words, as the posture adjustment mechanism of the exhaust gas flow adjustment plate,
If the exhaust gas flow adjustment plate is configured to be swingable around the horizontal axis,
The rectification direction and the degree of dispersion of the exhaust gas flow from the descending flue can be easily adjusted.

According to the third aspect, the flow velocity distribution in the first or second aspect can be more finely adjusted. In other words, by forming the exhaust gas flow adjusting plate into upper and lower portions so that the relative angle can be adjusted, the rectification direction and the degree of dispersion of the exhaust gas flow from the descending flue can be easily adjusted while individually adjusting the vertical direction. In addition, if a gap is provided between the vertically divided exhaust gas flow control plates, the flow of the exhaust gas passing through the gap and flowing to the back is added, so that the flow velocity distribution can be easily made uniform.

According to the fourth characteristic configuration, the flow velocity distribution in the direction along the partition can be adjusted to a desired distribution in the first to third characteristic configurations. In other words, if the exhaust gas flow adjusting plate is divided into a plurality of parts in the direction of the horizontal axis, the flow velocity distribution originally occurs in the direction along the partition walls. This distribution can be flattened by controlling the attitude of the flow adjusting plates individually.

According to the fifth aspect, it is possible to further uniform the flow velocity distribution of the ascending exhaust gas flow over the entire flow path of the ascending flue section in the first to fourth aspects. . That is, it is possible to change the deflection direction of the exhaust gas flow by providing a plurality of exhaust gas flow adjusting plates and disposing the horizontal axis cores differently. Normally, the flow rate in the wall opposed to the partition wall and in the region near the side walls on both sides tends to be high. Therefore, by flowing this toward the partition wall and toward the center, the opposed wall is In addition, it is possible to disperse the exhaust gas flow in a region near the both side walls to make the exhaust gas density uniform over the entire region. Therefore, the flow velocity distribution can be flattened.

[0011] According to the sixth aspect, the flow velocity distribution along the heating pipe can be easily adjusted to a desired distribution in the first to fifth aspects. That is, the flow velocity distribution can be detected by providing the flow velocity measuring means for detecting the flow velocity distribution of the exhaust gas flowing between the heating pipes, and the position or the posture of the exhaust gas flow adjusting plate is determined based on the detection result of the flow velocity measuring means. Since the rectifying plate control mechanism for changing and adjusting is provided, the position and / or posture of the exhaust gas flow adjusting plate are controlled either or both so that the flow velocity distribution approaches a desired distribution, so that the flow velocity distribution can be finely adjusted. become.

According to the seventh aspect, the temperature distribution on the tube wall of the heating conduit can be adjusted to a desired distribution while adjusting the flow velocity distribution in the sixth aspect to a desired distribution. That is, by disposing a plurality of temperature measuring means for detecting the pipe wall temperature of the heating pipe along the heating pipe, the temperature distribution of the pipe wall of the heating pipe can be detected, and the temperature measuring means can detect the temperature distribution of the pipe wall of the heating pipe. Since the flow velocity measuring means is configured to detect the flow velocity distribution of the exhaust gas from the detected temperature distribution, the flow velocity distribution can be adjusted to a desired distribution, and the temperature distribution of the pipe wall can be surely adjusted. Moreover, since the temperature distribution corresponds to the flow velocity distribution of the exhaust gas, the flow velocity distribution can also be detected.

As a result, the flow velocity distribution of the exhaust gas along the heating conduit arranged in the rising flue can be adjusted, so that the temperature of the exhaust gas for heating the heating conduit is maintained at a predetermined temperature. Meanwhile, corrosion of the outer wall of the heating pipe can be prevented.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One example of an embodiment of the above-described flue structure of the present invention will be described below with reference to the drawings. FIG. 1 shows a refuse incinerator in which an exhaust gas flow control plate according to the present invention is arranged, FIG. 2 is a schematic view of the flue before and after a flue bend, and FIG. 3 shows the exhaust gas flow control plate as an example. In a state where a specific position and posture are set, a flue curve is drawn along a flue curve section along a vertical plane perpendicular to the partition wall of the descending flue section and ascending flue section, and a streamline of the exhaust gas flow along the vertical section above it. FIG. 4 is an operation explanatory view of the exhaust gas flow adjusting plate. Note that the same elements as those described in the related art and elements having the same functions are denoted by the same reference numerals as in FIG. 12, and a part of the detailed description is omitted.

A waste heat boiler 20 in which exhaust gas from a furnace of a garbage incinerator is subjected to secondary combustion to generate steam by the heat thereof
The flue 10 from the outlet has a descending flue section 11 having a rectangular flat cross section for guiding the exhaust gas flow S vertically downward, and a rising flue section having a rectangular flat cross section for guiding the exhaust gas upward. 13 is provided with a flue bend portion 12, and the flue bend portion 12 has a wall surface extending downward from both walls facing the partition wall 14 so as to form a constriction. The lower part of the side walls 16 on both sides is extended as it is. A partition wall 14 between the descending flue section 11 and the ascending flue section 13 is formed in a water pipe wall, and a boiler lower header 20a of the waste heat boiler 20 is provided at a partition lower end 14a at a lower end thereof. It is provided between the flue on both sides. For this reason, the lower end portion 14a of the partition wall has an expanded cross-sectional shape. A superheater pipe 21 for heating the steam from the waste heat boiler 20 is disposed near a lower end of the rising flue section 13 as a heating pipe for heating the fluid.

The flue bend 1 below the rising flue 13
An exhaust gas flow adjusting plate 1 that can swing around a swing axis P on the horizontal axis is disposed at 2. The exhaust gas flow adjusting plate 1 has a rectifying surface 2 formed in a concave shape. In other words, the straightening surface portion 2 is formed to be bent in the shape of a vertical section, and the maximum flow velocity portion St of the exhaust gas flow S descending down the descending flue portion 11 is defined by the straightening surface portion 2.
Of the rectifying surface portion 2 or the portion below the lower surface (lower rectifying surface portion 4), and the bent portion of the rectifying surface portion 2 forms the farthest surface portion 2 a furthest from the vertical plane F along the partition wall 14. The rocking axis P along the farthest surface 2a is arranged parallel to the vertical plane F and horizontally (see FIG. 2).

The interplanar angle between the upper rectifying surface portion 3 forming the rectifying surface portion 2 above the farthest surface portion 2a and the lower rectifying surface portion 4 forming the rectifying surface portion 2 below the farthest surface portion 2a is 145 to 145.
The upper rectifying surface portion 3a is formed at an angle of 3 ° with respect to the vertical plane F.
The posture is controlled so as to have a gradient of 5 ° or less. The maximum gradient of the upper rectifying surface portion 3 is an angle set so that dust such as fly ash does not accumulate on the back surface, and the downward gradient of the partition wall lower end portion 14a on the side of the upward flue portion 13 is: The angle is set for the same reason, and the exhaust gas flow S drifting toward the angle is made to follow as much as possible. The inclination of the lower rectifying surface portion 4 changes in accordance with the change in the attitude of the upper rectifying surface portion 3, but the angle of the maximum gradient is set for the same reason. Further, the angle of the gradient of the lower rectifying surface portion 4 receives the maximum flow rate portion St of the exhaust gas flow S descending from the descending flue portion 11 and partially scatters downward to the upper partition wall 14. It is also set to be deflected toward. Note that the actual gradient of the upper end rectifying surface portion 3a and the lower end rectifying surface portion 4 whose inclination changes accordingly.
The gradient of a differs depending on the position where the exhaust gas flow control plate 1 is arranged and the shape of the flue, and is adjusted according to each situation.

The exhaust gas flow adjusting plate 1 is provided with the swing shaft P
It is configured to be swingable around, as shown in FIG.
The swing shaft 5 is pivotally supported on the side walls 16 on both sides of the partition wall 14. The farthest surface portion 2a is formed along the pivot axis P. Because it is formed in this way, 145-
The upper rectifying surface portion 3 and the lower rectifying surface portion 4 formed at an inter-plane angle of 110 ° change their posture in conjunction with each other. The surface-to-surface angle is deflected toward the partition 14 along the upper rectifying surface portion 3 while scattering part of the maximum flow rate portion St of the exhaust gas flow S descending from the descending flue portion 11 downward, In addition, it is set so as to scatter downward along the lower rectifying surface portion 4. If the angle between the surfaces is appropriately set, and the gradient of the upper rectifying surface portion 3a and the gradient of the lower rectifying surface portion 4a are suitable gradients, the rising gas at the position where the superheater conduit 21 is disposed. The flow Su has an upward uniform flow velocity distribution.

The exhaust gas flow adjusting plate 1 is arranged such that the pivot axis P is not higher than the lower end 14a of the partition wall, and the bottom 12a of the dust hopper formed by the bent portion 12 of the flue. (It is sealed by a seal damper that is opened and closed at the time of dust discharge.) It is arranged so as to be located at the center in the vertical direction between the partition lower end portion 14a. This position varies depending on the shape of the peripheral wall of the flue bending portion 12, that is, the shape of the dust hopper. Further, the width of the upper rectifying surface portion 3 in the up-down direction is equal to the lower end portion 14a of the partition wall and the bottom portion 12a.
The vertical width of the lower rectifying surface portion 4 is also preferably 40% or less of the vertical distance between the lower rectifying surface portion 4 and the vertical distance between the partition lower end portion 14a and the bottom portion 12a. Is preferably 40% or less.

In order to adjust the attitude of the exhaust gas flow adjusting plate 1, that is, the angle of the upper rectifying surface portion 3 with respect to the vertical plane F, an attitude adjusting mechanism 6 for controlling a driving mechanism for driving the swing shaft 5 is provided. (See FIG. 3). The attitude adjusting mechanism 6 may control the attitude of the exhaust gas flow adjusting plate 1 by, for example, rotating an arm attached to the swing shaft 5 by a cylinder mechanism. If the posture is to be maintained while allowing the swing vibration caused by receiving the exhaust gas flow S on the rectifying surface portion 2, the cylinder mechanism may be a pneumatic cylinder mechanism. The swing shaft 5
Gears may be attached to the motor, and the posture may be adjusted by a servo motor mechanism.

For controlling the attitude of the exhaust gas flow adjusting plate 1 by the attitude adjusting mechanism 6, a temperature measuring means 8 comprising a plurality of thermocouples is provided along the superheater pipe 21 (see FIG. 1). The attitude adjusting mechanism 6 is provided with the temperature measuring means 8.
Based on the detected temperature distribution, the swing shaft 5 is driven by feedback control so as to flatten the temperature distribution. The measurement result from the temperature measuring means 8 results in a temperature distribution on the outer wall of the superheater line 21, and this temperature distribution is representative of the flow velocity distribution of the rising gas flow Su.
The temperature measuring means 8 can be used as the flow velocity measuring means 7. That is, if the distribution of the outer wall temperature of the superheater pipe 21 obtained from the temperature measured by the temperature measuring means 8 becomes uniform, it can be determined that the flow velocity distribution of the rising gas flow Su is uniform. The superheater pipe 21
When it is desired to apply a temperature gradient to the heating pipeline exemplified in the above, the temperature gradient is given to the attitude adjusting mechanism 6 as a reference temperature for each measurement point, and the measurement results of the temperature measurement means 8 are respectively set to the reference temperature. The attitude of the exhaust gas flow adjusting plate 1 is controlled so as to match the above.

Next, another embodiment of the present invention will be described. <1> In the above embodiment, the flue bend 12
An example is shown in which the exhaust gas flow adjusting plate 1 which is bent and formed in a vertical cross-sectionally L-shape so as to be swingable around the horizontal axis P of swinging is provided. The rectifying surface portion 2 of the exhaust gas flow adjusting plate 1 has a curved surface. In the above embodiment, the angle formed between the upper end rectifying surface portion 3a and the vertical plane F is set to the angle formed between the upper rectifying surface portion 3 and the vertical surface F, and the lower end rectifying surface portion is formed. The angle between the vertical plane F and the vertical plane F of the lower rectifying surface 4
And the maximum flow velocity portion St of the exhaust gas flow S that has descended the descending flue section 11 while corresponding to the angle formed between
To the upper end rectifying surface portion 3a or the lower end rectifying surface portion 4a.
Therefore, the flow rate distribution of the ascending gas flow Su flowing into the ascending flue section 13 can be easily controlled.

<2> In the above embodiment, the exhaust gas flow control plate 1 integrally formed is configured to be swingable around the swing axis P, and the swing shaft 5 is connected to the partition wall. An example in which the exhaust gas flow regulating plate 1 is pivotally supported on the side walls 16 on both sides of the exhaust gas 14 is shown in FIG. 5, for example. There may be. According to such a configuration, the exhaust gas flow control plate 1 can be moved to an arbitrary position.
3, the flow velocity distribution of the rising gas flow Su can be adjusted to a desired distribution.

<3> In the above embodiment, the exhaust gas flow control plate 1 integrally formed is configured to be swingable about the swing axis P, and the swing shaft 5 is connected to the partition wall. In the example shown in FIG. 6, the exhaust gas flow adjusting plate 1 is formed so as to be able to relatively swing up and down the swing shaft 5, as shown in FIG. 6. , An upper adjustment plate 1a and a lower adjustment plate 1b. According to this structure, the approach angle of the exhaust gas flow deflected along the upper end rectifying surface portion 3a to the partition wall 14, the amount of the exhaust gas flow scattered along the lower rectifying surface portion 4a, and the degree of the dispersion are individually determined. , And the flow velocity distribution of the rising gas flow Su in the rising flue section 13 can be easily adjusted.

<4> Further, with respect to the configuration of the above <3>,
For example, as shown in FIG. 7, the upper adjustment plate 1a and the lower adjustment plate 1b are separately pivotally supported by different swing shafts 5, that is, a first swing shaft 5a and a second swing shaft 5b. If a gap is provided between the upper adjustment plate 1a and the lower adjustment plate 1b, the gas flow behind the exhaust gas flow adjustment plate 1 is reduced by the exhaust gas flowing through the gap. Spreading is facilitated, and the flow velocity distribution of the rising gas flow Su is further easily adjusted.

<5> In the example shown in <4>, the first swing shaft 5a and the second swing shaft 5b may be arranged before and after the exhaust gas flow S. In this case, for example, the first oscillating shaft 5a is arranged on the upstream side of the second oscillating shaft 5b (see FIG. 8), and the maximum flow velocity portion St is adjusted to the rectifying surface portion 2 (lower side) of the lower adjustment plate 1b. If the flow is received by the rectifying surface portion 4), the exhaust gas flow S scattered on the lower rectifying surface portion 4 and deflected upward is directed toward the partition wall 14 along the rectifying surface portion 2 (upper rectifying surface portion 3) of the upper adjustment plate 1a. In this case, the upper adjustment plate 1a and the lower adjustment plate 1b
Can also be scattered by the gas flow passing behind from the gap between the rising gas flow Su and the flow velocity distribution of the rising gas flow Su can be further easily adjusted.

<6> In the above embodiment, the exhaust gas flow control plate 1 integrally formed is configured to be swingable about the swing axis P, and the swing shaft 5 is connected to the partition wall. Although an example in which the exhaust gas adjusting plate 1 is pivotally supported on the side walls 16 on both sides of the 14 is shown, for example, the exhaust gas adjusting plate 1 may be divided along the swing axis P as shown in FIG. . Furthermore, it is more preferable that each of the divided exhaust gas adjusting plates 1 is individually controlled in a swinging posture, and the flow velocity distribution of the rising gas flow Su generated in the direction of the swinging axis P is more finely adjusted. Becomes possible.

<7> In the above embodiment, the exhaust gas flow control plate 1 integrally formed is configured to be swingable around the swing axis P, and the swing shaft 5 is connected to the partition wall. Although an example is shown in which the exhaust gas adjusting plates 1 are pivotally supported on both side walls 16 of both sides, a plurality of the exhaust gas adjusting plates 1 may be provided. If the attitude is individually controlled, the flow velocity distribution of the rising gas flow Su is further finely adjusted. It becomes possible to do. If the exhaust gas flow control plate 1 is provided integrally between the side walls 16 on both sides, it becomes possible to capture the exhaust gas flow S at different positions and to make the flow drift or diffuse.

<8> In the above item <7>, the exhaust gas flow adjusting plate 1 may be formed so as to be divided between the side walls 16, provided that the directions of the pivot axes P are different. Thus, the flow velocity distribution on the plane section of the ascending flue section 13 can be adjusted. For example, the exhaust gas flow control plate 1 is divided into three portions between the both side walls 16, and the swing axis P of the central exhaust gas flow control plate 1 is arranged in parallel with the partition wall 14,
The angle of the oscillating axis P of the exhaust gas flow adjusting plate 1 on the side with respect to the oscillating axis P of the exhaust gas flow adjusting plate 1 at the center is deflected inward so as to deflect the received exhaust gas flow S inward. By arranging them so as to face inward, it becomes possible for the exhaust gas leaning toward the both side walls 16 to drift or diffuse toward the center.

<9> In the above-described embodiment, the exhaust gas flow control plate 1 is provided in the flue bend 12 of the refuse incinerator in which the waste heat boiler 20 is provided in the exhaust gas channel from the furnace outlet. Although an example is shown, the refuse incinerator to which the present invention is applied may not be provided with a waste heat boiler. For example, as shown in FIG. Air may be blown into the exhaust gas to lower the exhaust gas temperature to a predetermined temperature. In other words, the drift of the upper exhaust gas flow Su in the upward flue section 13 occurs in the same manner as described in the above-described conventional technique, and due to the flow velocity distribution of the upper exhaust gas flow Su, for example, the heating pipe 21 of the air preheater.
In order to prevent corrosion due to temperature unevenness, the effect of providing the exhaust gas adjusting plate 1 is sufficient.

[0031]

EXAMPLES (Example 1) Simulating the flow rate of the rising exhaust gas flow Su near the superheater pipe 21 and the distribution of the exhaust gas temperature in the superheater pipe 21 in the configuration of the exhaust gas adjusting plate 1 described in the above embodiment. The results of estimation using are shown in FIGS. FIG. 3A shows a comparative example 1 in which the flue 10 described in the above-mentioned prior art is provided with a flue bend 12 formed in a four-sided constriction and the exhaust gas adjusting plate 1 is not provided. Figure (b) shows the descending flue 11
Bent section 12 formed by extending the side walls 16 on both sides of the partition wall 14 between the upper and lower flue section 13 from above as it is.
In addition, the exhaust gas control plate 1 described in the above-described embodiment is attached to the vertical surface F along the partition 14 of the upper rectifying surface 3 by 35%.
This is an embodiment in which it is arranged to be inclined downward at an angle of ゜. In both cases, the flue 10 is a sectional view in which the partition wall 14 is cut along a vertical plane perpendicular to the center of the flue 10, and fly ash and the like accompanying the exhaust gas from the flue in which the waste heat boiler 20 is disposed. Four representative particles of dust descend on the descending flue section 11 and rise on the ascending flue section 13 via the flue curve section 12 based on the estimated calculation results.
The dust was set as having an average particle size of 30 μm.

As is clear from the comparison of FIGS. 2A and 2B, the trace of dust in the embodiment is, as shown in FIG. For this reason, although it is slightly offset to the outside of the turning radius, it is well dispersed as compared with the comparative example shown in FIG. This indicates that the exhaust gas flow is well dispersed below the rising flue section 13.

(Embodiment 2) FIGS. 3 and 12 show that the descending flue section 11 is lowered from the outlet of a waste heat boiler 20 disposed in the flue 10 by using the same means as in the above-mentioned embodiment 1. The flow line is drawn so as to simultaneously show the flow velocity based on the calculation result of the estimated flow of the exhaust gas rising in the ascending flue section 13 via the flue curve section 12. FIG. 3 shows, similarly to the above, side walls 1 on both sides of a partition wall 14 of a descending flue section 11 and an ascending flue section 13.
In this embodiment, the flue gas adjusting plate 1 described in the first embodiment is provided on a flue bent portion 12 formed by directly extending the lower portion of the exhaust gas from above, and FIG. This is a comparative example 2 in which the flue 10 described in the above-mentioned technique is provided with a flue bend 12 formed in a four-sided constriction and the exhaust gas adjusting plate 1 is not provided.

As is apparent from a comparison between the two figures, the flow velocity distribution of the rising exhaust gas flow Su in the second embodiment is such that the gas flow path in which the superheater pipe 21 is disposed as shown in FIG.
The inlet has a substantially uniform flow velocity distribution, and the outlet has a uniform flow direction and flow velocity at the outlet. On the other hand, in Comparative Example 2, as shown in FIG.
The flow rate of the rising exhaust gas flow Su on the side of the wall 15 opposed to the above is substantially maintained at the outlet of the gas flow path in which the superheater conduit 21 is disposed.
As is clear from the above comparison, the effect of disposing the exhaust gas control plate 1 according to the present invention is clearly shown.

[0035]

As described above, according to the present invention,
The flow rate of the exhaust gas at the inlet of the ascending flue can be adjusted so as to be uniform from the partition wall to the opposite wall, so that, for example, in a refuse incinerator equipped with a waste heat boiler, a steam superheater It has become possible to maintain the temperature of the superheated steam at the outlet of the road at a required temperature and to protect the pipe wall from corrosion.

In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the configuration shown in the attached drawings.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating an example of a garbage incinerator to which the present invention is applied.

FIG. 2 is an explanatory cross-sectional view of a main part illustrating a configuration of the present invention.

FIG. 3 is a schematic sectional view of a flue showing an analysis result by a simulator for explaining the effect of the present invention.

FIG. 4 is an operation explanatory view of a cross section of a main part of the exhaust gas flow control plate.

FIG. 5 is an operation explanatory view of a cross section of a main part showing another example of the exhaust gas adjusting plate.

FIG. 6 is an operation explanatory view of a cross section of a main part showing another example of the exhaust gas adjusting plate.

FIG. 7 is an operation explanatory view of a cross section of a main part showing another example of the exhaust gas adjusting plate.

FIG. 8 is an operation explanatory view of a cross section of a main part showing another example of the exhaust gas adjusting plate.

FIG. 9 is a perspective view of a main part showing another example of the exhaust gas control plate.

FIG. 10 is a perspective perspective view of a flue showing a trace of dust illustrating the first embodiment.

FIG. 11 is an explanatory view of another example of a refuse incinerator to which the present invention is applied.

FIG. 12 is a schematic sectional view showing a flue gas flow distribution of a flue of a conventional refuse incinerator.

[Description of Signs] 1 Exhaust gas flow adjusting plate 6 Attitude adjusting mechanism 7 Flow velocity measuring means 8 Temperature measuring means 10 Flue duct 11 Downward flue section 12 Curved flue section 13 Upward flue section 21 Heating conduit P Oscillating axis

Claims (7)

[Claims] 1. A descending flue section (11) for directing exhaust gas downward into a flue (10) for conducting an exhaust gas flow from a waste heat treatment furnace, and an exhaust gas from the descending flue section (11). A flue bending section (12) for deflecting the flow upward, and a rising flue section (13) for guiding exhaust gas from the flue bending section (12) upward, the rising flue section (13). ) To heat the fluid to the heating conduit (2
1) a flue structure in which the heating pipe (2) is provided upstream of the heating pipe (21);
A flue structure provided with an exhaust gas flow adjusting plate (1) whose position or attitude can be changed and adjusted so that the exhaust gas flow velocity distribution at the arrangement position of (1) becomes a target distribution. 2. The exhaust gas flow adjusting plate (1) as a posture adjusting mechanism (6), wherein the exhaust gas flow adjusting plate (1) is configured to be swingable about a horizontal axis (P). The flue structure described. 3. The flue structure according to claim 1, wherein the exhaust gas flow adjusting plate (1) is divided vertically into upper and lower portions so that the relative angle can be adjusted. 4. The flue structure according to claim 1, wherein the exhaust gas flow adjusting plate (1) is divided into a plurality in the direction of the horizontal axis (P). 5. A plurality of said exhaust gas flow control plates (1) are provided,
The said horizontal axis core (P) is arrange | positioned so that it may differ.
5. The structure of the flue according to any one of 4. 6. A flow rate measuring means (7) for detecting a flow rate distribution of exhaust gas flowing between said heating pipe lines (21), and based on a detection result of said flow rate measuring means (7), The flue structure according to any one of claims 1 to 5, further comprising a current plate control mechanism for changing and adjusting the position or the posture of the adjustment plate (1). 7. A plurality of temperature measuring means (8) for detecting a pipe wall temperature of the heating pipe (21) are provided along the heating pipe (21). The flue structure according to claim 6, wherein the flow velocity measuring means (7) is configured to detect a flow velocity distribution of the exhaust gas from the detected temperature distribution.