JPH05157218A - Temperature regulating tower - Google Patents

Abstract

PURPOSE:To provide a temperature regulating tower which straightens the flow of exhaust gas so that exhaust gas flows balancedly through all spots in the tower through reduction of the occurrence of disturbance of a gas flow during introduction of exhaust gas to the tower, performs reliable mixture and contact of water, injected through a water spray nozzle, and exhaust gas with each other, lowers the temperature of exhaust gas with high efficiency, and prevents adhesion of water drops and dust to a tower wall and corrosion of the tower wall. CONSTITUTION:In a temperature regulating tower wherein exhaust gas from a refuse incinerator is cooled by means of water sprayed through one or a plurality of water spray nozzles 3, an introduction duct 1 for exhaust gas is arranged to the upper part of the tower such that the area of a gas flow passage is gradually increased from the inlet part of the duct 1 toward a connection between the duct 1 and the tower. A vertical louver 4 is placed in the vicinity of the inlet part of the duct 1. Preferably, a horizontal louver 7 is provided in the vicinity of a connection part between the introduction duct 1 and the tower in a state that it is inclined downward toward the gas downstream side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a 22
Exhaust gas before dust removal at 0 ° C to 280 ° C is
Regarding a temperature control tower which is a device for cooling to around 70 ° C. to 200 ° C., more specifically, it rectifies a gas flow in the temperature control tower, adheres water and dust to the tower wall, corrodes the tower wall. The present invention relates to a new structure of a temperature control tower that prevents such problems.

[0002]

2. Description of the Related Art A conventional temperature control tower, as shown in FIG. 7, has an exhaust gas introducing duct (1) at the upper part of the tower which is generally cylindrical.
However, a pair of vertical walls (1a) (1b) of the duct are provided so as to be parallel to a straight line (C) on one diameter of a circle formed by the horizontal section of the tower. Further, an outlet (2) for the cooled exhaust gas is provided in the lower part of the tower, and a water spray nozzle (3) is provided in almost the center of the tower ceiling wall.

[0003]

However, in this temperature control tower, only the water spray nozzle (3) is provided, and the rectification of the gas flow is hardly considered. Therefore, the following problems occur. There was a point.

That is, in this temperature control tower, the exhaust gas flows into the tower parallel to the pair of vertical walls (1a) (1b) of the introduction duct (1), so that as shown in FIG. 7 (b). In the tower, a vortex gas flow is generated outside the extension of the walls (1a) and (1b), and this vortex gas flow is one of the causes of the disturbance of the velocity distribution of the gas flow in the tower. Was there.

The exhaust gas from the refuse incinerator sent to the temperature control tower contains a lot of dust because it is before dust removal, and it also contains corrosive gas. When the gas flow is turbulent, the water (gas) sprayed from the nozzle (3) is not sufficiently mixed (heat exchange), and the dust (D) adheres to the tower wall and the water directly adheres to the tower wall. Wetness was seen. For this reason, the gas passage is blocked, and HCl or SO ₂ in the gas reacts with the metal wall in the painted wall portion,
The wall was rapidly corroded, and there were problems such as holes in the wall.

A conventional temperature control tower is shown in FIG. The main difference from the temperature control tower of Fig. 7 is that the water spray nozzle (3) is provided on the peripheral wall at the top of the tower,
After all, there was a problem similar to the above.

The object of the present invention is to solve the above problems of the conventional temperature control tower, reduce the turbulence of the gas flow at the time of introducing the exhaust gas into the tower, and make the exhaust gas average at all points in the tower. To ensure that the water sprayed from the water spray nozzle and the exhaust gas are mixed and contact with each other to lower the temperature of the exhaust gas efficiently and to prevent water droplets and dust from adhering to the tower wall and corrosion of the tower wall. It is to provide a temperature control tower that can be prevented.

As a result of intensive studies, the present inventors have found that the above object can be achieved by providing the exhaust gas introduction duct with a specific shape and providing a vertical louver in the vicinity of the inlet of the duct, and based on these findings. The present invention has been completed.

[0009]

That is, the present invention is directed to one or more water atomizing nozzles for exhaust gas from a refuse incinerator.
In a temperature control tower that is cooled by water sprayed from (3), the exhaust gas introduction duct (1) is located at the top of the tower.
At least one vertical louver is formed in the vicinity of the inlet of the duct (1) so that the gas passage area increases from the inlet of the (1) toward the connection between the duct (1) and the tower.
(4) is provided in the temperature control tower.

Further, in the present invention, the introduction duct (1)
Near the connection between the tower and the tower, at least one horizontal louver
It is preferable that (7) is provided so as to be inclined downward toward the gas downstream side.

In the temperature control tower according to the present invention, at least one vertical partition plate (5) is provided at the upper part of the temperature control tower, and the introduction duct is provided.
It is preferably provided in the length direction of (1). Further, it is preferable that the lattice-shaped slits (6) are provided over the entire horizontal cross-sectional area of the tower at the upper part of the temperature control tower and at a height position lower than the lower wall of the introduction duct (1). ..
Further, in the present invention, at least a part of the ceiling wall of the temperature control tower is inclined downward toward the gas wake side (8)
Preferably.

[0012]

As described above, the temperature control tower of the present invention is formed such that the flow passage area of the exhaust gas introduction duct (1) increases as it goes to the gas downstream, and the vicinity of the inlet of the duct (1) is formed. Since the vertical louvers (4) are installed in the column, and preferably the horizontal louvers (7) are also installed, the turbulence of the gas flow when introducing the exhaust gas into the tower is reduced, and It can be rectified so that the exhaust gas flows evenly at the points.

In the present invention, the vertical partition plate (5) and the grid-like slits (6) are provided, and further, at least a part of the tower ceiling wall is inclined downward toward the gas wake side.
(8) In the temperature control tower of the preferred embodiment, the above rectifying action can be further increased.

[0014]

The present invention will be described in detail with reference to the illustrated embodiments. In the description of the embodiment, the upper side of FIG. 1 (b) will be referred to as the left side and the left side will be referred to as the front side.

[Example 1] Referring to FIG. 1, a temperature control tower according to the present invention is provided with an exhaust gas introduction duct (1) at the upper part of a generally cylindrical tower, and at the bottom of the tower, the cooled exhaust gas is exhausted. An outlet (2) is provided (not shown), and a water spray nozzle (3) is provided almost at the center of the tower ceiling wall.

Left and right vertical walls (1c) and (1d) of the duct (1)
Is symmetrical and forms an angle of about 20 ° with each of the straight lines (C1) and (C2) parallel to the straight line (C) on one diameter of the approximately circular shape of the horizontal section of the tower, and the duct (1) The gas passage area of the duct (1) is formed so as to increase from the entrance of the duct toward the connecting portion between the duct (1) and the tower.

Further, three vertical louvers (4) are provided side by side in the vicinity of the entrance of the duct (1). The height of the vertical louvers (4) is about 80% of the distance between the upper and lower walls of the duct (1) and its width is about 65% of the height.

With this structure, the exhaust gas introduced from the inlet of the duct (1) can reduce the generation of gas vortices as in the case of the conventional temperature control tower shown in FIG. As a result, the velocity distribution of the gas flow in the tower becomes almost uniform, and the nozzle
(3) The sprayed water and gas can be sufficiently mixed (heat exchange), and the adhesion of dust to the tower wall and the direct wetting of water to the tower wall can be significantly reduced. it can.

In the present invention, the angles formed by the vertical walls (1c) and (1d) and the straight lines (C1) and (C2) are preferably in the range of about 10 to 30 °, respectively. Also a vertical louver
The number of sheets in (4) may be less than or more than three.

[Embodiment 2] In FIG. 2, the introduction duct
Three horizontal louvers (7) are arranged vertically in the vicinity of the connection between (1) and the tower, and the angle of the louver (7) is inclined downward by about 30 ° toward the gas wake side. is doing.

Other configurations in FIG. 2 are similar to those in FIG.

With this structure, it is possible to prevent the deviation of the gas flow to the rear part of the tower due to the collision of the gas flow with the rear wall of the upper part of the tower, and to further improve the uniformity of the velocity distribution of the gas flow in the tower. it can.

In the present invention, the horizontal louver (7)
The inclination angle of is not particularly limited and can be determined in consideration of the relationship with the tower diameter and the like. Also a horizontal louver
The number of sheets in (7) may be less than or more than three.

[Embodiment 3] In FIG. 3, three vertical partition plates (5a), (5b) and (5c) are provided on the upper part of the temperature control tower so that the length of the introduction duct (1) is in contact with the ceiling wall of the tower. It is provided in the direction. The central partition plate (5a) on the straight line (C) is provided over a length substantially similar to the diameter of the tower, and the left and right partition plates (5b) and (5c) are orthogonal to the straight line (C). The diameter (C ') is divided into four equal parts (5a) and the diameter (C'). The height of these vertical partition plates (5a) (5b) (5c) extends from the ceiling wall of the tower to slightly below the lower wall of the duct (1).

Other configurations in FIG. 3 are similar to those in FIG.

With this structure, it is possible to prevent the generation of a swirling vortex flow of gas as shown by a broken line in FIG.

In the present invention, the number of vertical partition plates may be smaller or larger than three.

[Embodiment 4] In the temperature control tower of FIG. 4, three vertical partition plates (5a) (5b) (5c) were introduced at the upper part of the temperature control tower of FIG. 2 in contact with the ceiling wall of the tower. It is provided in the longitudinal direction of the duct (1). The central partition plate (5a) on the straight line (C) is provided on the gas downstream side of the louver (7). Also, the left and right partition plates (5b) and (5c) have the same diameter as in the case of FIG.
At the position where (C ') and (5a) are approximately divided into four equal parts,
It is provided behind (C '). These vertical dividers (5a)
The height of (5b) (5c) extends from the ceiling wall of the tower to slightly below the lower wall of the duct (1).

Other configurations in FIG. 4 are similar to those in FIG.

[Embodiment 5] In FIG. 5, lattice-like slits (6) are provided at a height position immediately below the vertical partition plates (5a) (5b) (5c) over the entire horizontal sectional area of the tower. Has been. The shape of this lattice is a square with one side of 100 mm, and the height of the slit (6) is 200 mm.

Other configurations in FIG. 5 are similar to those in FIG.

With this structure, a downward uniform gas flow in the tower can be obtained.

In this embodiment, the lattice shape is square, but in addition to polygons such as rectangles, triangles and hexagons,
It may be circular.

[Embodiment 6] In FIG. 6, the ceiling wall behind the diameter (C ') of the temperature control tower is inclined downward at an angle of about 45 ° toward the gas wake side (8 ).

Other configurations in FIG. 6 are similar to those in FIG.

With this structure, deviation of the gas flow to the rear part of the tower due to collision of the gas flow with the rear wall of the upper part of the tower is further prevented than that of the temperature control tower in FIG. 5, and on the slit (6) of the gas flow. The static pressure distribution of can be made as constant as possible. As a result, the gas flow velocity distribution in the tower can be made constant.

In this embodiment, the slanted ceiling (8) is provided in the rear part from the center of the temperature control tower ceiling wall, but it is also possible to make almost the entire ceiling wall of the tower slanted ceiling.

[Example 7 and Comparative Example 1] In order to compare the performances of the temperature control tower of Example 6 (FIG. 6) according to the present invention and the conventional temperature control tower (FIG. 7), FIG. A model test apparatus having a tower diameter of 1880 mm shown in [Example 7] and FIG. 10 [Comparative Example 1] was prepared, and the velocity distribution of the gas flow and the wetting condition of the tower wall were investigated. A part of the tower wall of the model test device was made of a transparent plate (11) so that the inside of the tower could be observed. Also, on the inner wall of the tower at a position 2 m and 3 m below the tip of the nozzle (3), the upper tower (9) is provided.
A bottom grate (10) was provided to collect water sprayed from the nozzle (3).

A. Velocity distribution of gas flow In the model test device shown in FIG.
It was introduced from the introduction duct (1) at a flow rate of g = 20,000 Nm ³ / h, and at a height of 500 mm below the slit (6) with a hot-wire anemometer, at intervals of 200 mm in the horizontal two-dimensional direction
The velocity of the gas flow at the location was measured.

Similarly, with the model test apparatus shown in FIG.
The measurement was performed at the same height position.

[0041]

[Table 1] From the results shown in Table 1, in the conventional test device, the average flow velocity at 61 locations is 1.67 m / sec (maximum 3.4 m / sec, minimum 0.6 m / sec), and the standard deviation with respect to the average flow velocity is 0.
881 was improved by the test apparatus of the present invention to have an average flow velocity of 1.53 m / sec (maximum 2.35 m / sec, minimum 0.65 m / sec) and a standard deviation of 0.362, and the gas flow was improved. It can be seen that is very averaged.

B. Wetness of the tower wall Water injection from the water spray nozzle (3) with water quantity Qw = 500 l / h and spray air quantity Qa = 100 Nm ³ / h, and air is Qg =
When the air is introduced through the introduction duct (1) at a flow rate of 20,000 Nm ³ / h and when air is not introduced (Qg = 0 Nm ³
/ H) for each of the upper and lower (9) and lower (1
The wetting condition of the wall was measured by the amount of water collected in 0).

[0043]

[Table 2] From the results shown in Table 2, it can be seen that when air is introduced in the conventional test apparatus, the amount of wetting of the upper wall rather increases, and the air (gas) flow is disturbed. On the contrary,
In the test apparatus of the present invention, the wetting amount of the entire wall is significantly reduced when air is introduced, as compared with the case where air is not introduced, so that the rectified air (gas) flow downward in the tower is reduced. You can see that it has been obtained.

[0044]

According to the temperature control tower of the present invention, the exhaust gas introduction duct (1) has a specific shape, and the vertical louver (4) is provided near the inlet of the duct (1), which is also preferable. Since the horizontal louver (7) is installed, the turbulence of the gas flow when introducing the exhaust gas into the tower is reduced, and the exhaust gas is rectified so that the exhaust gas flows evenly at all points in the tower. As a result, the water sprayed from the water spray nozzle (3) is surely mixed and contacted with the exhaust gas, the temperature of the exhaust gas is lowered efficiently, and water droplets and dust adhere to the tower wall, corrosion of the tower wall, etc. Can be prevented.

[Brief description of drawings]

FIG. 1 (a) is a vertical longitudinal sectional view showing a specific example of the temperature control tower of the present invention. (b) (a) is a horizontal sectional view along the duct of the temperature control tower of the figure.

FIG. 2 (a) is a vertical longitudinal sectional view showing a specific example of the temperature control tower of the present invention. (b) (a) is a horizontal sectional view along the duct of the temperature control tower of the figure.

FIG. 3 (a) is a vertical longitudinal sectional view showing a specific example of the temperature control tower of the present invention. (b) (a) is a horizontal sectional view along the duct of the temperature control tower of the figure.

FIG. 4 (a) is a vertical longitudinal sectional view showing a specific example of the temperature control tower of the present invention. (b) (a) is a horizontal sectional view along the duct of the temperature control tower of the figure.

FIG. 5 (a) is a vertical longitudinal sectional view showing a specific example of the temperature control tower of the present invention. (b) (a) is a horizontal sectional view along the duct of the temperature control tower of the figure.

FIG. 6 (a) is a vertical longitudinal sectional view showing a specific example of the temperature control tower of the present invention. (b) (a) is a horizontal sectional view along the duct of the temperature control tower of the figure.

FIG. 7 (a) is a vertical vertical sectional view showing a specific example of a conventional temperature control tower. (b) (a) is a horizontal sectional view along the duct of the temperature control tower of the figure.

FIG. 8 is a vertical longitudinal sectional view showing a specific example of a conventional temperature control tower.

FIG. 9 is a vertical vertical sectional view showing a model test apparatus corresponding to the temperature control tower (FIG. 6) according to the present invention.

FIG. 10 is a vertical longitudinal sectional view showing a model test device corresponding to a conventional temperature control tower (FIG. 7).

[Explanation of symbols]

 (1)… Introduction duct (2)… Outlet (3)… Water spray nozzle (4)… Vertical louver (5)… Vertical partition (6)… Lattice slits (7)… Horizontal louver (8)… Inclined ceiling

Front page continuation (72) Inventor Nobuyuki Yoshida 5-3-28 Nishikujo, Konohana-ku, Osaka City Hitachi Shipbuilding Co., Ltd. In-house (72) Inventor Tadao Murakawa 5-3-28 Nishikujo, Konohana-ku, Osaka City Hitachi Shipbuilding Co., Ltd.

Claims (2)

[Claims] 1. In a temperature control tower for cooling exhaust gas from a refuse incinerator with water sprayed from one or more water spray nozzles (3), an exhaust gas introduction duct is provided at the upper part of the tower.
(1) is formed so that its gas flow passage area increases from the inlet of the duct (1) toward the connection between the duct (1) and the tower, and at least 1 is provided near the inlet of the duct (1). A temperature control tower characterized by being provided with a number of vertical louvers (4). 2. Near the connection between the introduction duct (1) and the tower,
2. The temperature control tower according to claim 1, wherein at least one horizontal louver (7) is provided so as to be inclined downward toward the gas wake side.