JPH09117635A - Circulation spray pipe structure in the tower - Google Patents

Abstract

(57) An object of the present invention is to provide an intra-column circulation spray pipe structure capable of reducing the resistance of a gas flow path in an absorption tower and also reducing the scaling part of gypsum. SOLUTION: A support member of a circulation spray pipe 1 of an absorption liquid spray pipe for spraying an absorption liquid is provided above and below the circulation spray pipe 1.
By providing a structure in which the reinforcing plate 2 is integrally formed by extending a predetermined length along the pipe axis direction and outward in the radial direction, the strength of the spray pipe 1 itself is increased, so that the support member for the spray pipe 1 is formed. It is removed to reduce the area occupied by the absorbing solution spray pipe in the flow path cross section.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a support structure for an in-column circulation spray pipe of a flue gas desulfurization apparatus or a dust removal tower, and more particularly to an in-column circulation spray pipe in which a support member is formed integrally with the spray pipe. It relates to the tube structure.

[0002]

2. Description of the Related Art An absorption tower of a flue gas desulfurization apparatus using a wet limestone-gypsum method will be described with reference to FIG. 3. Exhaust gas for introducing combustion exhaust gas into the absorption tower 31 from upstream to downstream of the combustion exhaust gas flow. Introducing duct 32, absorbing liquid spray pipe 3
3, an eliminator 34 and an exhaust gas outlet duct 35 for discharging exhaust gas are provided, and an absorption liquid tank 36 for receiving the sprayed absorption liquid is integrated with the absorption tower 31 below the absorption liquid spray pipe 33. It is provided and is mainly configured.

In the flue gas desulfurization apparatus, the exhaust gas is brought into gas-liquid contact with a slurry-like absorption liquid containing an alkaline desulfurization agent such as calcium carbonate in the absorption tower 31 to desulfurize sulfur oxides (SO _x ) in the exhaust gas. The agent (absorption liquid) is absorbed and removed to perform desulfurization treatment of exhaust gas.

The exhaust gas introduction duct 32 is inserted from the side wall 31a of the absorption tower 31 so as to face the lower part of the absorption liquid spray pipe 33 in order to improve the contact with the absorption liquid.

A number of absorption liquid spray pipes 33 are horizontally inserted inside the absorption tower 31 from both sides of the absorption tower 31, and the absorption liquid spray pipe 33 is inserted from one side and the absorption liquid spray pipe 33 is inserted from the other side. The absorption liquid spray pipe 33 is provided in a vertically staggered manner, and is configured in multiple stages.

The diameter of the absorbing liquid spray pipe 33 is gradually reduced toward the tip, and the tip portion is separated from the inner wall of the absorber 31 by an appropriate gap to allow expansion and contraction due to thermal expansion. It is supported by a tip support member 48 provided in the absorption tower 31, and a contact portion between the tower wall through hole 49 provided in the side wall 31a of the absorption tower 31 and the absorbing solution spray pipe 33 is welded.

The eliminator 34 is made of a thin plate having a V-shaped cross section and removes the absorbing liquid contained in the exhaust gas.

A driving device 37 is provided adjacent to the absorption liquid tank 36 below the absorption tower 31, and the absorption liquid tank 36 is provided.
A stirring blade 38 is connected to the drive unit 37 by penetrating the side wall 36b of the above, and an oxidizing air introduction pipe 42 is formed above the stirring blade 38 as appropriate through the side wall 36b to the inner wall of the absorption liquid tank 36 on the opposite side. Have been passed over.

Absorbing liquid tank 36 on the opposite side of the stirring blade 38
The bottom part 36a is provided with a gypsum slurry discharge port 43 through the side wall 36b. Then, an absorbing liquid supply pipe 46 is connected to the gypsum slurry discharge port 43 appropriately above the side wall 36b. A reflux pipe 44 is connected between the absorbing liquid tank 36 and the absorbing liquid spray pipe 33.
Further, the pump 3 is provided in the vicinity of the absorption liquid tank 36 of the reflux pipe 44.
9 is connected, and a flow rate adjusting valve 45 is interposed in the vicinity of the absorption liquid spray pipe 33 of the reflux pipe 44.

An exhaust gas outlet duct 35 is attached to the side wall 31a above the absorption tower 31, and the exhaust gas outlet duct 35 extends downward outside the absorption tower 31 and reaches a discharge port (not shown). .

In the flue gas desulfurization apparatus described above, the absorption liquid in the absorption liquid tank 36 passes through the recirculation pipe 44 by the suction pump 39, and the flow amount is adjusted by the flow rate adjusting valve 45 to pass through the absorption liquid spray pipe 33. The spray nozzle 41 atomizes and sprays.

In this state, when the exhaust gas is introduced from the exhaust gas introducing duct 32 into the absorption tower 31, the sulfur oxide in the exhaust gas rising inside the absorption tower 31 is absorbed by the absorption liquid.

The absorbing liquid which has absorbed the sulfur oxides falls into the absorbing liquid tank 36, is oxidized by the air introduced from the oxidizing air introducing pipe 42 to be made into gypsum, and is appropriately discharged from the gypsum slurry discharge port 43. . The lime slurry in the absorbing liquid tank 36 is circulated again by the pump 39 through the reflux pipe 44.

The exhaust gas that has passed through the absorbing liquid spray pipe 33 has its liquid component removed by the eliminator 34 and is discharged from the exhaust gas outlet duct 32.

By the way, conventionally, in order to support the absorption liquid spray pipe 33 provided inside the absorption tower 31, the support member 47 such as H-shaped steel that can withstand the weight of the absorption liquid spray pipe 33 has been previously prepared. This is done by arranging a large number of them horizontally and side by side so as to intersect perpendicularly with the insertion direction of the absorbing solution spraying pipe 33 and providing them in multiple stages.

Further, the support member 47 has been used as a scaffold for workers at the time of maintenance inside the absorption tower 31.

FIG. 4 is a cross-sectional view of the structure of the in-tower circulation spray pipe supporting the absorbing liquid spray pipe 33, and FIG. 5 is a side view thereof.

4 and 5, a spray pipe through hole 52 for connecting the spray nozzle 41 is formed on both sides of the circulation spray pipe 51, and the spray nozzle base end portion 53 having an appropriate length is formed in the through hole 52. The spray nozzle tip portion 5 is connected to the spray nozzle tip portion 5 with the injection hole 54 provided at the tip thereof facing downward.
5 are connected by a flange 56.

The support member 47 shown in the lower portion of the absorbent spray pipe 33 is connected to the inner wall of the absorption tower 31 shown in FIG. The circulation spray pipes 51 are vertically arranged on the support member 47.

Further, the support member 47 has been used as a scaffold for maintenance workers at the time of maintenance.

[0021]

However, the support member 47 is only capable of withstanding the maximum weight to be placed, regardless of the strength and weight of the circulating spray pipe 51 itself or the presence or absence of the absorbing liquid in the circulating spray pipe 51. It was provided to have strength.

Further, since a large number of support members 47 are provided in a lattice pattern so as to intersect with the circulation spray pipe 51, there are problems that the support members 47 become a resistance to gas flow and increase the scaling portion of gypsum. there were.

[0023]

In order to solve the above-mentioned problems, the invention of claim 1 has one end supported by the inner wall of a tower such as an absorption or dedusting tower and the other end hung over the inner wall on the opposite side. In the circulating spray pipe, the circulating spray pipe is horizontally supported in the tower, and is extended vertically to the circulating spray pipe by a predetermined length along the pipe axial direction and radially outward. This is an internal circulation spray pipe structure in which a reinforcing plate is integrally formed.

According to a second aspect of the present invention, the circulation spray pipe is
2. The diameter of the reinforcing plate is gradually reduced from the fixed one end toward the other end, and the upper end of the reinforcing plate positioned above the circulation spray pipe has a flat horizontal surface. It is the described internal circulation spray tube structure.

According to the above construction, since the strength of the spray pipe itself can be increased, the weight of the spray pipe itself can be supported and the supporting member for the spray pipe can be removed. Moreover, the resistance of the gas flow and the scaling of the gypsum can be greatly reduced.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a sectional view of a main portion of a circulating spray pipe structure in a tower which constitutes the absorbent spray pipe of the present invention, and FIG.

The in-tower circulation spray pipe structure of the present invention includes a circulation spray pipe 1 and a spray nozzle 4 inserted into a large number of spray pipe through holes 3 formed on both sides of the circulation spray pipe 1 at appropriate intervals. It mainly comprises a reinforcing plate 2 which is integrally formed vertically with the circulation spray pipe 1 interposed therebetween.

As described with reference to FIG. 3, the circulation spray pipe 1 is connected to the reflux pipe 44 and is inserted into the tower wall through hole 49 formed by penetrating the side wall 31a of the absorption tower 31, one end of which is an inner wall. And the other end is provided so as to span the inner wall on the opposite side.

The tower wall through-holes 49 are formed on both sides of the absorption tower 31 so as to be horizontally aligned and vertically pass through the side walls 31a, and are formed according to the number of circulation spray pipes 1 to be inserted. . The column wall through hole 49 formed on one side of the circulation spray pipe 1 and the column wall through hole 49 formed on the other side are formed to coincide with each other in the horizontal direction but to be displaced in the vertical direction.

The circulation spray pipe 1 is gradually reduced in diameter from one end to be supported toward the other end, and the tip end on the small diameter side is adapted to allow expansion and contraction due to thermal expansion.
1 is supported by a tip support member 48 provided on the inner wall of the absorption tower 31, which is appropriately separated from the inner wall of 1.
The contact portion between the tower wall through hole 49 and the circulation spray pipe 1 is welded.

Since the tower wall through holes 49 formed on both sides of the absorption tower 31 are staggered in height, when the circulation spray pipe 1 is inserted, the circulation spray pipe 1 is also inserted from one side. The circulation spray pipes 1 inserted from the side are alternately arranged vertically in multiple stages.

Further, the spray nozzle 4 will be described. The spray nozzle 4 has a spray nozzle base end portion 7 having an appropriate length.
And a spray nozzle tip 6 provided with a spray hole 5 for spraying the absorbing liquid, and a flange 8. The spray nozzle base end 7 is appropriately provided on both sides of the circulation spray pipe 1 shown in FIG. A large number of spray pipe through holes 3 are formed at a distance from each other. The spray nozzle tip 6 is connected to the spray nozzle base 6 by a flange 8 with the injection hole 5 facing downward.

Next, the reinforcing plate connected to the circulation spray pipe 1 will be described in detail with reference to FIGS.

The reinforcing plate 2 is connected to the circulation spray pipe 1 shown in FIG. 2, and the circulation spray pipe 1 is reduced in diameter toward the tip end on the small diameter side as described in FIG. The reinforcing plate 2 is integrally formed with an appropriate height above and below the circulation spray pipe 1.
The upper end portion 2a of the reinforcing plate 2 located on the upper side of is formed to have a flat horizontal surface.

Therefore, the cross-sectional shape of the circulation spray pipe structure of the present invention shown in FIG. 1 is shown in the center as the circulation spray pipe 1 and the inner wall of the tower are separated from one end where they are welded.
And the height of the reinforcing plate 2 formed on the upper part increases.

As for the height of the reinforcing plate 2, the reinforcing plate 2 above the circulating spray tube 1 is formed to an appropriate height in consideration of the fact that an operator moves between the upper and lower circulating spray tubes 1 during maintenance. To do.

Further, since the tip end supporting member 48 is provided on the inner wall of the tower on the tip end side of the circulation spray tube 1, the reinforcing plate 2 is formed shorter than the circulation spray tube 1.

Next, the operation of this embodiment will be described.

According to the circulation spray pipe structure of the present invention, since the strength of the circulation spray pipe 1 itself can be increased, the self-weight can be supported by the strength of the circulation spray pipe 1 itself, and the circulation spray pipe shown in FIG. One support member 47 can be removed.

Therefore, the exhaust gas rising from below the circulation spray pipe 1 is not interrupted by the support member 47 of the circulation spray pipe 1 and is guided by the reinforcing plate 2 to rise smoothly.

Further, the absorption liquid which has absorbed the sulfur oxide is shown in FIG.
It almost falls on the support member 48 and the like shown in FIG.

Further, at the time of maintenance inside the absorption tower 31, the reinforcing plate 2 is used as a scaffold, and a worker moves across the reinforcing plate 2 to perform maintenance.

In the present embodiment, the circulation spray pipe structure of the present invention has been described as an example applied to a flue gas desulfurization apparatus using the wet limestone-gypsum method. However, other spraying using a circulation spray pipe is also possible. Needless to say, it is installed in a soot and smoke processing device.

Although not shown, the circulation spray pipe is easily bent when the inner width of the absorption tower 31 is increased. Therefore, the allowable stress of the material used for the circulation spray pipe and the load applied to the circulation spray pipe. In consideration of the buckling length, a transverse joint material (support member) may be provided as necessary.

Next, the spray pipe structure of the present invention is applied to a tower having an inner width of 95.
An embodiment when it is provided in an absorption tower having a length of 00 mm is shown.

The material used was SUS316L, and the materials having diameters of 250 A, 200 A, and 150 A were integrally connected, and the diameters were successively reduced. The reinforcing plate shown in FIG. 1 was manufactured by welding so that h was 500 mm and t was 12 mm.

The load condition is that the own weight is 0.982 kg /
cm, the liquid weight is 0.39 kg / cm, and the diameter of the circulation spray pipe 1 is between 250A and 200A and between 200A and 1A.
The section modulus and second moment with 50 A are calculated.

As a result, it was able to withstand a load in the axial direction sufficiently, but as a result of a study of lateral buckling, it was determined that if the transverse joint members (support members) were provided at intervals of about 3 m, it would not bend. Therefore, transverse materials were provided at intervals of 3 m.

The shape and height of the reinforcing plate are not limited to those shown in this embodiment, and the upper end of the upper reinforcing plate is provided with irregularities so that a worker can use it as a scaffold for maintenance. However, it does not have to be slippery, and it goes without saying that various changes can be made without departing from the scope of the present invention.

In the present embodiment, the reinforcing plate is
Although an example is shown in which the spray pipe is sandwiched and connected vertically, the reinforcing plate may be connected only to the upper side, or when the spray pipe is manufactured, it is extended radially outward to form the reinforcing plate. Is also good.

[0052]

In summary, according to the present invention, since the supporting members may be provided as needed, the number of supporting members can be greatly reduced.

Therefore, the resistance of the gas flow and the scaling of the gypsum can be greatly reduced.

Further, since the reinforcing plate is extended in parallel with the gas flow, the reinforcing plate can promote the rectification of the gas flow.

[Brief description of the drawings]

FIG. 1 is a sectional view of an essential part showing a circulating spray pipe support structure of the present invention.

2 is a side view of the circulation spray pipe support structure shown in FIG. 1. FIG.

FIG. 3 is a schematic diagram showing an absorption tower of a flue gas desulfurization apparatus using a conventional wet limestone-gypsum method.

FIG. 4 is a sectional view of an essential part showing a conventional circulating spray pipe support structure.

5 is a side view of the conventional circulation spray pipe support structure shown in FIG. 4. FIG.

[Explanation of symbols]

 1 Circulation spray pipe 2 Reinforcement plate 2a Upper end

Claims (2)

[Claims] 1. A circulation spray pipe, one end of which is supported by an inner wall of a tower such as an absorption or dedusting tower, and the other end of which is suspended over the inner wall of the opposite side, the circulation spray pipe being horizontally in the tower. A circulating spray in a tower, characterized in that a reinforcing plate is integrally formed on the circulating spray pipe, the reinforcing plate extending vertically along the pipe axial direction and outward in the radial direction by a predetermined length. Tube structure. 2. The circulation spray pipe is formed such that the diameter thereof is gradually reduced from one end to be fixed to the other end to be stretched over, and an upper end of a reinforcing plate positioned above the circulation spray pipe. The intra-column circulation spray pipe structure according to claim 1, wherein the part has a flat horizontal surface.