JP2002060060A - Powder and grain feeder and exhaust gas treatment device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a powder and grain feeder capable of reducing wear when feeding powders and grains. SOLUTION: An anti-segregation device 1 (powder and grain feeder) includes a chute 3 where an auxiliary plate 42 projects above a main plate 41 connected thereto via a stage 5 and arranged in an inclined position. A carbonaceous adsorbent 17 supplied from above the stage 5 flows down the chute 3, is partially blocked by the auxiliary plate 42, and accumulates to cover the entire upper surface of the chute 3. A further supply of the carbonaceous adsorbent 17 slides down the accumulation 17c of the carbonaceous adsorbent 17. This prevents dynamic contact between the chute 3 and the absorbent 17, thus making it possible to effectively inhibit the wear of the chute 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a granular material supply device and an exhaust gas treatment device, and more particularly to a granular material supply device for supplying a granular material downward, and an exhaust gas treatment device provided with the granular material supply device. Related to the device.

[0002]

2. Description of the Related Art As a conventional powdery material supply apparatus, besides a general-purpose powder hopper, for example, Japanese Patent Application Laid-Open No.
A supply section of a catalyst (powder or granule) constituting the dry desulfurization / denitration apparatus described in JP-A-332347. The catalyst supply unit is formed by connecting a plurality of pipe-type chutes to an upper distribution hopper, and aims to make the particle size distribution of the catalyst uniform in a moving bed disposed below these chutes. In addition, thereby, drift of the exhaust gas is sufficiently prevented, and a decrease in the exhaust gas processing efficiency is sufficiently suppressed.

[0003]

Incidentally, the dry desulfurization / denitration apparatus described in the above publication has the above-mentioned excellent effects and is sufficiently satisfactory from the viewpoint of exhaust gas treatment performance. is there. In contrast, the present inventors:
As a result of intensive studies and studies on the conventional apparatus, it has been found that although slightly, the chute tends to be gradually worn with the operation of the apparatus. Such an event does not greatly affect the exhaust gas treatment performance of the dry desulfurization / denitration equipment, but from the viewpoint of reducing the frequency of replacement of components constituting the equipment and improving maintainability and economy, this point is considered. It was concluded that further improvement was desirable.

Accordingly, the present invention has been made in view of such circumstances, and an object of the present invention is to provide a powder and granular material supply device capable of reducing abrasion when supplying the granular material. Another object of the present invention is to provide an exhaust gas treatment apparatus capable of sufficiently preventing the drift of exhaust gas, reducing the frequency of replacing members constituting the apparatus, and improving maintainability and economy.

[0005]

Means for Solving the Problems In order to achieve the above object, the present inventor has conducted further studies. As a result, the wear of the chute is reduced by the chute surface on which the granules such as the catalyst flows and the chute surface. Dynamic contact (friction, rubbing, etc.) was one of the main factors. In order to prevent such abrasion, it is easy to consider providing a liner material for abrasion prevention on the chute surface. However, this will complicate the structure of the member and increase the cost of the member. However, wear of the liner itself becomes a problem. Then, based on these findings, intensive research was conducted, and the present invention was completed.

That is, the granular material supply device according to the present invention supplies the granular material downward, and includes a main plate portion extending at a predetermined angle with respect to the horizontal, and an upper surface of the main plate portion. And a plurality of sub-plate portions arranged at predetermined intervals along the direction in which the main plate portion extends, and a chute to which the granular material is supplied is provided. And

[0007] In the granular material supply apparatus thus configured, when the granular material is supplied to the main plate portion of the chute, the main plate portion has a predetermined angle with respect to the horizontal, that is, the main plate portion is inclined. The granules flow down along the main plate portion. A part of the granular material is impeded (blocked) by a plurality of sub-plates projecting from the main plate and is blocked, and accumulates on the entangled portion between the main plate and the sub-plate. As a result, the entire upper surfaces of the main plate portion and the sub plate portion can be covered with the granular material,
Further, the supplied granular material flows down along the chute so as to overflow and slide down on the deposited granular material without directly and dynamically contacting the main plate portion and the sub-plate portion.

In addition, since the granular material can flow down along the chute, a structure in which the upper portion of the main plate is opened is possible.
In this case, the possibility of clogging is lower than that using a conventional pipe-type chute. Furthermore, the periphery of the whole granular material supply device may be covered with a lid or a housing. In this way, even if the chute is punctured or broken, the powder and granules are prevented from dissipating to the outside and the gas is prevented from leaking to the outside even when applied to a system using gas. Can be done.

It is preferable that the main plate is provided so as to satisfy a relationship represented by the following formula (1): θa ≦ θs ≦ θa + 30 ゜ (1) Here, in the formula, θa indicates the angle of repose formed by the granular material, and θs indicates the above-mentioned predetermined angle formed by the main plate portion with respect to the horizontal direction. By doing so, it is possible to suppress a decrease in the fluidity of the granular material and to prevent the flow speed of the granular material from excessively increasing.

Further, it is more preferable that the sub-plate portion is provided so as to satisfy a relationship represented by the following formula (2): Lp ≦ H × 4 (2). Here, in the formula, Lp indicates the predetermined interval between the plurality of sub-plate portions, and H indicates the height of the sub-plate portion from the main plate portion surface. By doing so, the granular material is easily deposited on the entire upper surface of the main plate portion, the exposure of the upper surface of the main plate portion is suppressed, and the wear of the chute due to the dynamic contact with the granular material can be reliably prevented.

Further, a plurality of chutes are provided,
It is preferable to further include a stage for connecting the plurality of chutes at the upper end of each of the chutes, and a hopper provided above the stage and into which the powder and granules are introduced.

In general, when a particle having a particle size distribution falls freely, it accumulates so as to form a free surface having a repose angle depending on the particle size distribution, material, shape and the like. At this time, those having a large particle size tend to gather at the peripheral portion, while those having a small particle size tend to gather at the central portion. Since the powders and granules dropped from the chute show the same tendency, the powders supplied and accumulated downward from the chute have a nonuniform particle diameter as a whole. In this case, the supply target of the granular material is, for example, dry desulfurization and
In the case of a denitration device, gas drift may occur as described in the conventional publication.

On the other hand, by appropriately arranging a plurality of chutes, the granular material can be supplied from a plurality of locations, so that unevenness in the overall particle size of the accumulated granular material can be reduced or prevented. When these chutes are connected by a stage at the upper end, and the particles are introduced from the hopper onto the stage, the particles accumulated on the stage overflow and are supplied to the respective chutes substantially uniformly. Therefore, uniformity of the amount and particle size of the powder and granular material supplied from each chute downward can be favorably achieved.

At this time, it is preferable that the hopper has an adjustment margin for adjusting the installation position along the horizontal direction. With such a configuration, it is easy to match the position where the powder or granular material falls from the hopper to the center of the stage.
Thereby, there is an advantage that the powder and granules can be more uniformly supplied to each chute. Therefore, the amount and particle size of the granular material supplied from each chute downward can be further uniformed.

Further, the exhaust gas treatment apparatus according to the present invention comprises a moving bed through which the exhaust gas flows and a powder having the adsorption capacity or resolution of the exhaust gas flowing, and a plurality of the present invention provided above the moving bed. And a granular material supply device.

Here, it is preferable that a carbonaceous adsorbent such as activated carbon, a catalyst or the like is used as the powder. In the exhaust gas treatment device configured as described above, the granular material is supplied to the moving bed from the granular material supply device of the present invention, and the exhaust gas flows through the moving bed and is adsorbed by the adsorption ability of the granular material, Alternatively, it is decomposed by the resolution of the granular material. As described above, the wear of the chute of the granular material supply device when supplying the granular material is sufficiently suppressed, so that the frequency of replacement of the chute is reduced, thereby extending the life of the device, and consequently the maintainability of the device. And the economy can be improved.

In some cases, the particle size of the powder is distributed widely, for example, in the range of about 1 to 9 mm with the operation of the exhaust gas treatment apparatus. When the granules having such a particle size distribution are circulated and used in the exhaust gas treatment device, by using the granule supply device of the present invention having a plurality of chutes of the present invention, the drift of the exhaust gas in the moving bed is suppressed. It becomes possible.

Preferably, the moving layer is composed of a plurality of regions defined by partition walls extending in a substantially vertical direction, and the chute of the powder and granular material supply device is expressed by the following formula (3): 0.2 ≦ La / Lb ≦ 0.5 (3) It is useful if provided so as to satisfy the relationship represented by the following expression. Here, in the formula, La indicates the width of the shoot, and Lb
Indicates the width in the direction orthogonal to the direction in which the exhaust gas flows in the horizontal cross section of the region.

In this case, the granular material supplied downward from the chute of the granular material supply device flows into a plurality of regions of the moving bed, and moves (flows down) in each of those regions. That is, the granular material divides each region in the moving bed. At this time, when the chute satisfies the relationship of the above-mentioned formula (3), the granular material is easily distributed uniformly to each region, and the particle size distribution of the granular material flowing in each region is easily achieved. Therefore, drift of the exhaust gas, such as exhaust gas flowing in a specific area, can be sufficiently suppressed.

In the present invention, the term "granules" refers to a plurality of solid particles in the form of powder or granules (eg, carbonaceous adsorbent particles such as activated carbon, catalyst particles, etc.). An aggregate or an aggregate may be used, and the geometric or three-dimensional shape is not particularly limited, and examples thereof include shapes having a spherical shape, a cylindrical shape, a cylindrical shape, and the like.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail. Note that the same components are denoted by the same reference numerals, and redundant description will be omitted. Unless otherwise specified, the positional relationship such as up, down, left, and right is based on the positional relationship shown in the drawings.

FIG. 1 is a schematic diagram showing an exhaust gas treatment apparatus according to the present invention. The exhaust gas treatment apparatus 100 includes an adsorption reaction tower 110 and a desorption / regeneration tower 120, between which transfer machines 131 and 13 such as a conveyor.
2 are installed. The transfer devices 131 and 132 are arranged such that one end thereof is located below and above the adsorption reaction tower 110, respectively, and the other end thereof is located above and below the desorption regeneration tower 120, respectively. Are located. These transfer devices 131 and 132 are for transferring a carbonaceous adsorbent described later between the adsorption reaction tower 110 and the desorption regeneration tower 120. Further, the carbonaceous adsorbent is supplied to the adsorption reaction tower 110 and the desorption regeneration tower 120 from the upper end, flows down the inside of each, and is discharged from the lower end to the outside.

The adsorption reaction tower 110 has an exhaust gas supply section 18 and a treated gas discharge section 20 on its side wall. The exhaust gas W is introduced into the exhaust gas supply unit 18. The exhaust gas W is subjected to desulfurization (adsorption of SOx components) by a carbonaceous adsorbent, dust removal, etc., while flowing across the interior of the adsorption reaction tower 110, and discharges the treated gas as treated gas Ws. Stack (chimney) 140 from part 20
Sent to When reducing nitrogen N such as ammonia is supplied to the adsorption reaction tower 110 together with the exhaust gas W, the exhaust gas W can be denitrated (decomposition of the NOx component).

SOx in the exhaust gas W in the desorption regeneration tower 120
The carbonaceous adsorbent having adsorbed the components is sent to the desorption regeneration tower 120 by the transfer device 131, and the SOx component is desorbed by heating in the desorption regeneration tower 120. The desorbed and concentrated SOx gas is recovered as a by-product (such as sulfuric acid) in the recovery unit 150. Further, a sieve separator 16 is provided between the lower end of the desorption regeneration tower 120 and the other end of the transfer device 132.
0 is set. The carbonaceous adsorbent regenerated in the desorption regenerator 120 is sorted by the sieve 160 according to the particle size, and the carbonaceous adsorbent having a particle size of a predetermined size or more is transferred to the adsorption reaction tower 110 Will be returned to

FIG. 2 shows the exhaust gas treatment apparatus 100 shown in FIG.
FIG. 2 is a perspective view (partially cutaway view) schematically showing a structure of a main part (adsorption reaction tower) of FIG. In the adsorption reaction tower 110, a body 13 having a rectangular cross section is connected below an upper hopper 12 having a conical shape,
A lower hopper 14 having an inverted conical shape (funnel shape) is connected below the body portion 13. Further, a pair of moving layers 1 that are opposed to each other and arranged in parallel with each other
0, 10 are formed.

Further, at the upper end of the upper hopper 12, there is provided a supply port 15 into which a carbonaceous adsorbent 17 (granules) such as granular activated carbon is introduced. On the other hand, a discharge port 16 for the carbonaceous adsorbent 17 is provided at the lower end of the lower hopper 14. The carbonaceous adsorbent 17 supplied to the upper hopper 12 through the supply port 15 is supplied to each moving bed 10 and the lower hopper 1.
4 is discharged to the outside of the adsorption reaction tower 110 from the outlet 16. The above-described transfer machines 131 and 132 (see FIG. 1) are provided below the discharge port 16 and the supply port 15 respectively.
It is arranged above.

Further, the exhaust gas supply section 18 and the processed gas discharge section 20 are disposed on one and the other side walls of the body 13, respectively. From the exhaust gas supply section 18 to the body section 13
The exhaust gas W introduced into the inside is diverted to the left and right in the supply direction, circulates in each moving bed 10, becomes processed gas Ws, merges in the processed gas discharge unit 20, and is discharged therefrom. You.

The moving layer 10 is a space defined between the entrance louver 10a and the exit louver 10b. The inlet louver 10a has an opening structure so that the flowing-down carbonaceous adsorbent 17 does not pass through to the outside, while the outlet louver 10b is formed of a perforated plate. The diameter of each hole of the outlet louver 10b is also set such that the flowing carbonaceous adsorbent 17 does not pass through the outside. With such a structure, the carbonaceous adsorbent 17 flows down the moving bed 10 without fail, and the exhaust gas W and the treated gas Ws can pass through each moving bed 10. Further, between the inlet louver 10a and the outlet louver 10b, a plurality of partition walls 9 (partition walls) are provided substantially at right angles to each other and at predetermined intervals. Thus, the moving layer 10 is partitioned into a plurality of regions.

At the lower end of each moving layer 10, a plurality of cutting devices 22 such as a roll feeder rotated by a driving system (not shown) are provided. These cutting devices 2
2 adjusts the filling level of the carbonaceous adsorbent 17 in the moving bed 10 while keeping the carbonaceous adsorbent 17 through the outlet 16.
Is to be discharged in fixed amounts. With such a configuration, the carbonaceous adsorbent 17 in each moving bed 10 can flow down at a desired constant speed.

FIG. 3 is a sectional view taken along the line III-III in FIG. 2 (partially omitted), and mainly shows the internal structure of the upper hopper 12 constituting the adsorption reaction tower 110. FIG. 4 is a sectional view taken along line IV-IV in FIG. In FIG. 4, the drawing of the upper hopper 12 is omitted. FIG. 5 is a sectional view taken along line VV in FIG.

As shown, inside the upper hopper 12,
A segregation prevention device 1 (powder supply device) including an internal hopper 2 (hopper portion) and a plurality of (four in this embodiment) chutes 3 is provided. The internal hopper 2 has an inverted cone shape (funnel shape), and is provided with a substantially cylindrical discharge portion 2b communicating with a lower portion of a supply portion 2a to which the carbonaceous adsorbent 17 is supplied. . Further, the internal hopper 2 has an adjustment margin C in the horizontal direction, is appropriately positioned within the range of the adjustment margin C, and is fixed at a predetermined position. Although the value of the adjustment margin C is not particularly limited, for example, it is preferable that the center of the cross section of the internal hopper 2 can be adjusted by about ± 50 mm in the east-west-north-south direction in consideration of the installation accuracy of the members.

The chute 3 is formed by joining side plates 43 to both edges of a main plate 41 (main plate portion) having a plurality of plate-shaped sub plates 42 (sub plate portions) protruding therefrom. These chutes 3 are connected at their upper ends via a stage 5 and extend radially. In FIG. 4, two of the four chutes 3 are arranged such that the lower end is located above each moving layer 10. It is preferable that two or more chutes 3 are provided for one moving layer 10.

The inlet louver 10a and the outlet louver 10
b, each moving layer 10 is divided along the flow direction of the exhaust gas W by the perforated plates 10c and 10d as described above, and the moving layer 10 is divided by the plurality of partition walls 9 described above. It is further divided in the longitudinal direction. Further, the moving beds 10, 10 are connected at the upper end of the entrance louver 10a via a convex member 12a having a tower top and an inclined surface.

Hereinafter, the operation of the segregation preventing device 1 in the exhaust gas treatment device 100 configured as described above will be described. The carbonaceous adsorbent 17 transferred by the transfer device 132 shown in FIG. 1 or the carbonaceous adsorbent 17 newly added to the exhaust gas treatment device falls from the supply port 15 of the upper hopper 12 into the upper hopper 12. Is introduced continuously. The carbonaceous adsorbent 17 is supplied to the internal hopper 2 from the supply unit 2a, and drops from the discharge unit 2b to the center on the stage 5 through the inside. The carbonaceous adsorbent 17 forms a free surface having an angle of repose mainly determined by the particle size distribution on the stage 5 and is deposited in a mountain-like manner (an aggregate 17a (granules) shown in FIGS. 3 and 5). reference).

The carbonaceous adsorbent 17 further supplied onto the stage 5 overflows from the surface of the integrated body 17a and is supplied to the upper end of the chute 3, and the main plate 4 is tilted by the chute 3.
Flow down along 1. Here, FIG. 6 is a cross-sectional view (partially omitted) schematically illustrating a state where the carbonaceous adsorbent 17 is flowing down the chute 3 while showing a main part of the chute 3.
A part of the flowing carbonaceous adsorbent 17 is prevented from flowing by the uppermost sub-plate 42 and is deposited on the upstream side near the joint (entangled part) between the main plate 41 and each sub-plate 42.

At this time, the surface of the accumulated body 17c (granules) of the deposited carbonaceous adsorbent 17 forms a free surface having a repose angle θa determined by the particle size distribution described above. Carbonaceous adsorbent 1 no longer blocked by the uppermost sub-plate 42
Numerals 7 slide down on the stack 17c, are hindered by the sub-plates 42 located further downstream, and sequentially accumulate on the upstream side of each sub-plate 42. Eventually, the carbonaceous adsorbent 17 is blocked by all the sub-plates 42, and the upper surfaces of the main plate 41 and the sub-plate 42 are entirely covered with the carbonaceous adsorbent 17. Further, the supplied carbonaceous adsorbent 17 slides (falls down) along the chute 3 on the aggregate 17c.

Thus, the carbonaceous adsorbent 17 falls downward from the chute 3 and is supplied onto a predetermined area of each moving layer 10. In the normal steady operation state, the carbonaceous adsorbent 17 thus supplied is continuously and quantitatively discharged from the moving bed 10 at a flow rate corresponding to each region while being filled in the entire moving bed 10. You. Therefore, the carbonaceous adsorbent 1 is located in the space just above the moving layer 10 inside the upper hopper 12.
The state where 7 has been filled in a predetermined amount is maintained. The level at which the carbonaceous adsorbent 17 overflows from the chute 3 differs depending on the filling level, and the carbonaceous adsorbent 17 accumulates in a mountain shape having a free surface determined by the angle of repose even above the moving layer 10 (FIG. 3 and the aggregate 17b (granules) shown in FIG. 5), and then flows into the moving bed 10.

Here, the main plate 41 constituting the chute 3
Is preferably the following formula (1); θa ≦ θs ≦ θa + 30 ゜ (1), more preferably the following formula (4); θa ≦ θs ≦ θa + 20 ゜ (4), particularly preferably the following formula (5) Θa ≦ θs ≦ θa + 10} (5). Here, in the formula, θa indicates a repose angle (°) formed by the carbonaceous adsorbent 17, and θs indicates a predetermined angle (°) formed by the main plate 41 with respect to the horizontal direction. As a specific example of the angle of repose θa, in the case of granular activated carbon having a columnar shape as the carbonaceous adsorbent 17 having a particle size distribution of about 1 to 9 mm,
About 32 °. However, the numerical value is not limited to this.

If θs is less than θa, the carbonaceous adsorbent 17 only accumulates on the chute 3 and does not easily flow down on the chute 3. On the other hand, when θs exceeds θa + 30 °, the falling speed of the carbonaceous adsorbent 17 becomes excessive (unnecessarily).
The carbonaceous adsorbent 17 which is increased and discharged downward from the lower end of the chute 3 may be biased toward the side wall of the body 13.

The sub-plate 42 projecting from the main plate 41 is
Preferably, the following formula (2); Lp ≦ H × 4 (2), and more preferably the following formula (6): H ≦ Lp ≦ H × 2 (6) . Here, in the formula, Lp indicates an interval (arrangement interval) between the sub-plates 42, and H indicates a height H of the sub-plate 42 from the surface of the main plate 41. Specifically, when granular activated carbon having a columnar shape having a particle size distribution of about 1 to 9 mm flows down as the carbonaceous adsorbent 17, for example, H is set to about 50 mm, and Lp is set to 185 mm.
Degree. However, the numerical values are not limited to these.

When this Lp exceeds H × 4, the main plate 41
Is hardly covered with the carbonaceous adsorbent 17, and a part of the main plate 41 may be exposed. In this case, dynamic contact between the flowing carbonaceous adsorbent 17 and the main plate 41 tends to occur. Further, when Lp is less than H, the number of sub-plates 42 increases, which is disadvantageous in cost, and the flow resistance of the carbonaceous adsorbent 17 by the sub-plates 42 may increase improperly.

Referring back to FIG. 4, the shoot 3 is preferably of the following formula (3): 0.2 ≦ La / Lb ≦ 0.5 (3), more preferably the following formula (7): 0.25 ≦ La / Lb ≦ 0.4 (7) It is preferable to provide the relationship so as to satisfy the following expression. Here, in the formula, La indicates the width of the chute 3 and L
b is the longitudinal width of a region partitioned in the moving layer 10, that is, the exhaust gas W in the horizontal cross section of the region.
Indicates the width in the direction orthogonal to the direction in which Specifically, for example, the total width of the moving layer 10 in the longitudinal direction is 6 to 10 m.
Lb is about 1 m, and La is 20 to
It can be about 50 cm. However, the numerical values are not limited to these.

If the ratio La / Lb is less than 0.2, the falling range of the carbonaceous adsorbent 17 supplied downward from the chute 3 is significantly narrowed, and the carbonaceous adsorbent 17 17 may be unevenly distributed. On the other hand, when La / Lb exceeds 0.5, the tendency that the particle size distribution of the carbonaceous adsorbent 17 differs in each region tends to occur.
Further, when the condition of the expression (3) is satisfied, there is an advantage that it is easy to prevent the falling speed of the carbonaceous adsorbent 17 on the chute 3 from becoming too small or too large.

According to the segregation preventing device 1 and the exhaust gas treatment device 100 using the same, the carbonaceous adsorbent 17 supplied from the stage 5 and flowing down the chute 3 is used as described above. The portion is blocked by the sub-plate 42, and the upper surfaces of the main plate 41 and the sub-plate 42 are entirely covered with the carbonaceous adsorbent 17. Therefore, the deposited carbonaceous adsorbent 17
Becomes a liner (so-called “self-liner”) covering the upper surface of the chute 3, and direct and dynamic contact between the carbonaceous adsorbent 17 flowing down along the chute 3 and the main plate 41 and the sub plate 42 is prevented. . Therefore, abrasion of the chute 3 due to the contact between the flowing carbonaceous adsorbent 17 and the main plate 41 and the sub plate 42 can be sufficiently prevented. As a result, the frequency of replacement of the chute 3 can be reduced, and the maintainability and economy of the exhaust gas treatment device 100 can be improved.

Further, since the chute 3 is opened above the main plate 41, it is less likely to be closed as compared with a conventional one using a pipe-type chute. Furthermore, since the segregation prevention device 1 is covered by the upper hopper 12, the carbonaceous adsorbent 17 and the exhaust gas W are discharged to the outside of the adsorption reaction tower 110 even if the chute 3 is punctured or broken. They do not dissipate or diffuse. From these facts, the exhaust gas treatment device 1
00 can be improved. Furthermore, since the carbonaceous adsorbent 17 and the exhaust gas W do not diffuse or diffuse to the outside, even if such an abnormality should occur, it is advantageous in that it is easier to recover than the conventional case using a pipe-type chute. It is.

Further, when the number of the chutes 3 is one, as described above, the carbonaceous adsorbent 17 having a particle size distribution is used.
When the particles fall and accumulate, they tend to accumulate in the peripheral portion as the particles have a large particle size and accumulate in the center portion as the particles have a small particle size. In this case, a large amount of particles having a large particle diameter are supplied to the region of the moving layer 10 formed at a position far from the chute 3. In this case, inconvenience such as drift of the exhaust gas W may occur.

On the other hand, since the exhaust gas treatment apparatus 100 includes a plurality of chutes 3 for one moving bed 10, the carbonaceous adsorbent 17 supplied to each region of the moving bed 10 is provided.
Can be sufficiently uniformized. That is, segregation of the carbonaceous adsorbent 17 having a particle size distribution can be sufficiently prevented. Therefore, it is possible to suppress the occurrence of a short path of the exhaust gas W flowing through the moving bed 10 and the increase in pressure loss. As a result, it is possible to reliably prevent a reduction in the processing efficiency such as the desulfurization rate and the denitration rate of the exhaust gas W.

Further, when the main plate 41 is provided so as to satisfy the relationship represented by the equation (1), it is possible to sufficiently suppress the decrease in the fluidity of the carbonaceous adsorbent 17, and It is possible to sufficiently prevent the downflow speed of No. 17 from excessively increasing. Therefore, the carbonaceous adsorbent 17 can be reliably supplied downward, and the carbonaceous adsorbent 17 can be prevented from being supplied unbalanced to a specific portion of the moving bed 10.
As a result, the particle size distribution of the carbonaceous adsorbent 17 flowing down each region of the moving bed 10 can be further uniformed, and a short path of the exhaust gas W flowing through the moving bed 10 can be generated, and the pressure loss can be reduced. The increase can be further prevented. Accordingly, it is possible to further prevent a decrease in the processing efficiency such as a desulfurization rate and a denitration rate from the exhaust gas W.

In addition, when the sub-plate 42 is provided so as to satisfy the relationship represented by the equation (2), it is easy to cover the entire upper surface of the main plate 41 with the carbonaceous adsorbent 17. Therefore, the main plate 4
1 can be prevented from being exposed. Thereby, the dynamic contact between the carbonaceous adsorbent 17 and the main plate 41 is reliably prevented, and the wear of the chute 3 can be further suppressed. Therefore, the frequency of replacement of the chute 3 can be further reduced, and the maintainability and economy of the exhaust gas treatment device 100 can be further improved.

Further, since the internal hopper 2 has the adjusting margin C capable of adjusting the installation position along the horizontal direction, the drop position of the carbonaceous adsorbent 17 from the internal hopper 2 can be easily matched with the center of the stage 5. be able to. Thereby, the carbonaceous adsorbent 17 can be evenly supplied to each chute 3. Therefore, the amount and particle size of the carbonaceous adsorbent 17 supplied from each chute 3 downward can be further uniformed. Furthermore, since the internal hopper 2 is positioned by the adjustment margin C, and the internal hopper 2 is fixed at that position, the internal hopper 2 is not operated during the operation of the exhaust gas treatment apparatus 100 (while the carbonaceous adsorbent 17 is being supplied). Displacement can be reliably prevented.

Further, when the chute 3 is provided so as to satisfy the relationship represented by the equation (3), the falling range of the carbonaceous adsorbent 17 supplied downward from the chute 3 is significantly reduced. Can be suppressed. In this case, there is also an advantage that it is easy to prevent the falling speed of the carbonaceous adsorbent 17 on the chute 3 from becoming too small or too large. Thus, the carbonaceous adsorbent 17 is placed in a specific area of the moving bed 10.
Can be prevented from drifting due to uneven distribution of the exhaust gas W. When the condition of the expression (3) is satisfied, it is possible to further prevent the difference in the particle size distribution of the carbonaceous adsorbent 17 for each region.

In the above-described embodiment, the numbers of the chute 3 and the stage 5 of the segregation preventing device 1 and the connection structure thereof are not limited to those shown in the drawings. As another configuration, for example, a segregation preventing device 7 configured as shown in FIG. 7 can be exemplified. FIG. 7 is a plan view schematically showing a configuration of another embodiment of the granular material supply device according to the present invention. The segregation preventing device 7 is configured such that the stage 5 to which the end of the chute 3 is further coupled is connected to the lower end of each chute 3 of the segregation preventing device 1 shown in FIG. In the case of the drawing, the carbonaceous adsorbent 17 is supplied to one moving bed 10 from six places above the moving bed 10 to further prevent segregation.

Further, the segregation preventing devices 1 and 7 may be used for supplying a granular material other than the carbonaceous adsorbent 17. Examples of other powders and granules include powdery or granular catalysts, charcoal particles, various granules,
Examples include various pulverized bodies, beans or dried fruits, or grains or milled grains thereof. The segregation prevention device of the present invention is extremely effective as a device for supplying these powders and granules to a transfer device for the powders and granules, or a tank such as a storage tank, a storage tank, a silo, or a reaction tower such as a blast furnace. It is something.

[0054]

As described above, according to the granular material supply apparatus of the present invention, since the chute having the main plate portion provided with the sub plate portion is provided, the upper surface of the chute is entirely covered with the granular material. Dynamic contact between the chute and the chute which is covered and flows (flows down) is effectively prevented. Thereby, wear of the chute can be reliably suppressed. Further, since the exhaust gas treatment apparatus of the present invention has a plurality of the granular material supply apparatuses of the present invention, drift of the exhaust gas is prevented, and a reduction in the exhaust gas treatment efficiency can be sufficiently prevented. In addition, since the wear of the chutes is suppressed, the frequency of replacing the chutes, which are constituent members, can be reduced, that is, the life of the apparatus can be extended. As a result, the maintainability and economy of the exhaust gas treatment device can be improved.

[Brief description of the drawings]

FIG. 1 is a configuration diagram schematically showing an exhaust gas treatment apparatus according to the present invention.

FIG. 2 is a perspective view schematically showing a structure of a main part (adsorption reaction tower) of the exhaust gas treatment apparatus shown in FIG.

FIG. 3 is a sectional view (partially omitted) taken along line III-III in FIG. 2;

FIG. 4 is a sectional view taken along line IV-IV in FIG. 3;

FIG. 5 is a sectional view taken along line VV in FIG. 3;

FIG. 6 is a cross-sectional view schematically showing a main part of the chute and schematically showing a state in which a carbonaceous adsorbent is flowing down the chute.

FIG. 7 is a plan view schematically showing a configuration of another embodiment according to the granular material supply device according to the present invention.

[Explanation of symbols]

1, 7: segregation prevention device (powder supply device), 2: internal hopper (hopper portion), 3: chute, 5: stage, 9 ...
Partition walls (partition walls), 10 ... moving layer, 17a, 17b, 17
c: Aggregate (granule), 17: carbonaceous adsorbent (granule), 41: main plate (main plate portion), 42: sub plate (sub plate portion),
100 ... exhaust gas treatment device, 110 ... adsorption reaction tower, 120
... Desorption regeneration tower, C: adjust, W: exhaust gas, Ws: treated gas, θa: angle of repose.

────────────────────────────────────────────────── ─── of the front page continued (51) Int.Cl. ⁷ identification mark FI theme Court Bu (reference) B01D 53/56 B01D 53/34 123B 4G070 53/94 129B B01J 4/00 105 53/36 101A 8/12 331 B65G 11/16 F term (reference) 3F011 BA02 BC03 3F075 AA08 BA03 BB04 CA01 CA06 DA17 4D002 AA02 AA12 BA04 BA06 CA08 DA07 DA41 EA08 FA08 GA03 GB20 4D048 AA06 AB02 AC04 BA05X BB01 CB03 CC38 CD08 CD10 A03A08 A068 A068 AF36 AF40 4G070 AA01 AB05 BB21 CA07 CA10 CA13 CB07 CB08 CB11 CB19 CC07 DA15

Claims (7)

[Claims] An apparatus for supplying a granular material to supply a granular material downward, comprising: a main plate portion extending at a predetermined angle with respect to the horizontal; and protruding from the main plate portion. Powder comprising: a plurality of sub-plate portions arranged at predetermined intervals along an extending direction of the main plate portion; and a chute to which the granular material is supplied. Granule supply device. 2. The main plate portion has the following formula (1): θa ≦ θs ≦ θa + 30 ゜ (1), θa: angle of repose formed by the powdery granules, θs: the main plate portion forms with respect to the horizontal direction The granular material supply device according to claim 1, wherein the predetermined angle is provided so as to satisfy a relationship represented by the following expression. 3. The sub-plate portion has the following formula (2): Lp ≦ H × 4 (2), Lp: the predetermined interval between the plurality of sub-plate portions, and H: the main plate portion of the sub-plate portion. 3. The granular material supply apparatus according to claim 1, wherein the apparatus is provided so as to satisfy a relationship represented by: 4. A stage provided with a plurality of the chutes, wherein the plurality of chutes are connected at an upper end portion of each of the chutes, a hopper provided above the stage, and into which the granular material is introduced, The granular material supply device according to any one of claims 1 to 3, further comprising: 5. The powder and granular material supply device according to claim 4, wherein the hopper has an adjustment margin for adjusting an installation position along a horizontal direction. 6. A moving bed through which an exhaust gas flows and through which a granular material having an adsorption capacity or a resolution of the exhaust gas flows, and a plurality of moving beds provided above the moving bed. An exhaust gas treatment device comprising: the granular material supply device according to item 1. 7. The moving bed is composed of a plurality of regions partitioned by partition walls extending in a substantially vertical direction, wherein the chute of the granular material supply device has the following formula (3): 0.2 ≦ La / Lb ≦ 0.5 (3), La: width of the chute, Lb: width in a horizontal cross section of the region in a direction orthogonal to a direction in which the exhaust gas flows, and is provided so as to satisfy the following relationship. 7. The exhaust gas treatment device according to claim 6, wherein: