JP2002018251A - Ammonia diluting apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ammonia diluting apparatus capable of enhancing the dissolving capacity of introduced ammonia gas and capable of suppressing the generation of noise and vibration during operation. SOLUTION: In the ammonia diluting apparatus which is equipped with a dilution tank 2 storing a diluent liquid and an introducing pipe 4 for introducing ammonia gas into the dilution tank 2 and dissolves the introduced ammonia gas in the diluent liquid, a fluid dispersing member for dispersing a flow of the ammonia gas is housed in the leading end part 20 of the introducing pipe 4 and an ammonia gas jet orifice 24 is formed at the position facing to the fluid dispersing member of the introducing pipe 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an ammonia diluting apparatus for diluting introduced ammonia gas with a diluting liquid.

[0002]

2. Description of the Related Art When ammonia gas is discharged from an ammonia facility, since the ammonia gas is toxic, a process of discharging waste water after dissolving it with water in an ammonia diluting apparatus is performed. As a conventional ammonia diluting device, for example, a device disclosed in Japanese Patent Application Laid-Open No. H11-119456 is known, and this configuration is shown in FIG.

[0003] As shown in FIG. 1, in this ammonia diluting apparatus, when a safety valve is operated or blown in an ammonia facility, ammonia gas is sent into an ammonia diluting tank 61 through a pipe 63, and an ejection hole formed in a header 65 is provided. Is released into the water. The ammonia gas rises in the water as bubbles, and in the rising process, passes through a bubble splitting device 67 composed of Raschig rings or the like, and is split into small bubbles.

[0004]

In the above-described conventional ammonia diluting device, the bubble of the ammonia gas is split by the bubble splitting device 67, so that the contact area with water is increased to improve the dissolving ability. I have. However, a state in which ammonia gas is present as bubbles in water even after passing through the bubble splitting device 67 is considered that the ammonia concentration has almost reached the saturation concentration. There was a problem that a sufficient gas dissolving ability could not be obtained.

On the other hand, when ammonia is hardly dissolved in the water in the ammonia dilution tank 61, most of the bubbles ejected from the header 65 reach the bubble splitting device 67 because the ammonia gas is immediately dissolved. Disappear before. However, since these bubbles are larger than the bubbles that have passed through the bubble splitting device 67, when the bubbles are instantaneously crushed during dissolution, the pressure suddenly changes locally due to the same phenomenon as cavitation, resulting in a large hammer noise and vibration. There was a problem that occurs.

The present invention has been made to solve these problems, and can improve the dissolving ability of the introduced ammonia gas and can suppress the generation of noise and vibration during operation. It is intended to provide an ammonia dilution device.

[0007]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a diluting tank for storing a diluting liquid, and an introduction pipe for introducing ammonia gas into the diluting tank. In the ammonia dilution device for dissolving in a liquid, a fluid dispersion member for dispersing the flow of ammonia gas is housed at the distal end of the introduction pipe, and an ejection hole for ammonia gas is provided at a position of the introduction pipe facing the fluid dispersion member. Achieved by the formed ammonia dilution device.

In this ammonia diluting device, the sum of the opening areas of the ejection holes facing the downstream half of the fluid dispersion member is larger than the sum of the opening areas of the ejection holes facing the upstream half of the fluid dispersion member. It is preferable to make it larger.

Further, it is preferable that the fluid dispersion member is disposed in a horizontal state, and the total opening area of the ejection holes facing the upper half of the fluid dispersion member is determined by subtracting the total area of the ejection holes facing the lower half of the fluid dispersion member. It is preferable to make it larger than the total opening area of the holes.

It is preferable that a negative pressure prevention hole communicating with the upper portion of the dilution tank is formed in the introduction pipe.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a longitudinal sectional view showing an ammonia dilution device according to one embodiment of the present invention.
As shown in FIG. 1, the ammonia dilution device includes a dilution tank 2 in which water for dilution is stored, and an introduction pipe 4 for introducing ammonia gas into the dilution tank 2.

The dilution tank 2 is connected to a water supply pipe 6 for supplying water into the tank from a water source such as industrial water, and a drain pipe 8 for guiding the water in the tank to a wastewater treatment device (not shown). In the middle of the water supply pipe 6 and the drainage pipe 8, a water supply valve 7 and a drainage valve 9 are provided, respectively. The upper part of the dilution tank 2 communicates with the outside via a demister 10, and a spray nozzle 14 is provided above the demister 10. The spray nozzle 14 is connected to a water source via the watering valve 12,
By opening the watering valve 12, water can be sprayed on the demister 10.

One end of the introduction pipe 4 is connected to a liquefied ammonia storage tank (not shown), an ammonia vaporizer (not shown), an accumulator (not shown), and the like in the ammonia facility via piping. The other end of the introduction pipe 4 extends into the dilution tank 2, and a nozzle pipe 20 is attached to the tip. Further, the introduction pipe 4 has a negative pressure prevention hole 30 formed at the uppermost part in the dilution tank 2.

FIG. 2 is an enlarged sectional view of the nozzle tube 20.
As shown in the figure, the nozzle tube 20 is arranged in a horizontal state at the lower part of the dilution tank 2, and contains a fluid dispersion member 22 therein. The fluid dispersion member 22 is made of a stainless steel wire mesh having a three-dimensional network structure, and is configured to be capable of dispersing the flow of the passing fluid.

The nozzle tube 20 has a plurality of ejection holes 24 formed in a peripheral portion facing the fluid dispersion member 22, and the tip is covered with a cover flange 26. The ejection holes 24 are provided in the upper half on the peripheral surface of the nozzle tube 20, and a large number (for example, about 30) are provided on the downstream side along the gas flow. For example, when the diameter of the introduction pipe 4 is 100A, the diameter of the ejection hole 24 is preferably about 20 mm.
It is preferable to make the opening cross-sectional area larger than 0. still,
At the lowermost part of the nozzle tube 20, a drain hole 28 used for maintenance is formed.

Next, the operation of the ammonia dilution device will be described. For example, when blowing ammonia gas from the ammonia facility, first, the water spray valve 12 is opened to spray water to the demister 10, and the water supply valve 7 is opened to submerge the nozzle pipe 20. In this state, ammonia in the introduction pipe 4 is partially dissolved, and water has entered the inside of the nozzle pipe 20. The water surface position in the dilution tank 2 is
It is below the negative pressure prevention hole 30.

Next, when ammonia gas is blown,
The water inside the nozzle pipe 20 is pushed out to the dilution tank 2 by the gas pressure of the ammonia gas in the introduction pipe 4. However, since a part of the water adheres to the fluid dispersion member 22 and remains, a part of the ammonia gas is dissolved in the process of passing through the fluid dispersion member 22.

On the other hand, the remaining undissolved ammonia gas is finely dispersed in the process of passing through the fluid dispersion member 22, so that the ammonia gas bubbles released from the ejection holes 24 are very fine. . Therefore, the contact area between the ammonia gas and water increases, and the ability to dissolve in water increases. Furthermore, even when the bubbles are immediately dissolved and crushed, noise and vibration can be suppressed low because the bubbles are fine.

As described above, since the dissolving ability of the ammonia gas in the dilution tank 2 is high, water is once pushed out from the nozzle tube 20 and then new water enters the nozzle tube 20.
This water is pushed out again by the blow pressure of the ammonia gas.

As described above, the flow of water into and out of the nozzle tube 20 is repeated, so that the fluid dispersion member 22 after the water is pushed out is wet with water having a low ammonia concentration. Therefore, the ability to dissolve ammonia gas when passing through the fluid dispersion member 22 can always be maintained well.

When the ammonia gas dissolves inside the introduction pipe 4, the inside of the introduction pipe 4 becomes negative pressure, so that the suction force to the introduction pipe 4 acts on the water in the dilution tank 2 and the inside of the dilution tank 2 Is guided to the introduction pipe 4 through the negative pressure prevention hole 30.
In the present embodiment, since the fluid dispersion member 22 becomes a resistance when water passes through the nozzle pipe 20, only gas is introduced into the introduction pipe 4 through the negative pressure prevention hole 30, and the ammonia equipment (not shown) ) Can reliably prevent the risk of backflow of water.

During the blowing of the ammonia gas, a part of the ammonia gas is discharged from the negative pressure prevention hole 30 to the dilution tank 2. Since this ammonia gas is dissolved in the water sprinkled in the process of passing through the demister 10, the discharge of the ammonia gas to the outside of the dilution tank 2 is prevented.

As mentioned above, one embodiment of the present invention has been described in detail, but a specific embodiment of the present invention is not limited to this. For example, in the present embodiment, a wire mesh is used as the fluid dispersion member 22, but a plurality of laminates such as a punched metal plate and a mesh plate can be used. Further, a fluid dispersion member can be formed by winding a Raschig ring, a pole ring, a terraret, or the like into a tubular shape with a wire mesh or the like. In this case, it is preferable that the number of meshes of the wire net is, for example, 10 to 20.

Further, the ejection holes 24 formed in the nozzle tube 20 are formed.
Is not particularly limited as long as the position faces the fluid dispersion member 22, but is focused on the downstream side of the nozzle pipe 20 so as to secure a sufficient contact area between the ammonia gas and the fluid dispersion member 22. It is preferable to arrange them in a uniform manner. That is, the fluid dispersion member 2 is formed on a surface perpendicular to the axial direction of the nozzle tube 20.
When the two are equally divided, the total opening area of the ejection holes 24 facing the downstream half (the left half in FIG. 1) of the fluid dispersion member 22 is equal to the upstream half (the right half in FIG. 1) of the fluid dispersion member 22. It is preferable that each of the ejection holes 24 is arranged so as to be larger than the total opening area of the ejection holes 24 facing the ejection holes 24.

Further, when the nozzle tube 20 is filled with water, the ejection holes 24 are provided in the nozzle tube 20 so that undissolved ammonia gas does not stay inside the nozzle tube 20.
It is preferable to arrange them mainly on the upper side. That is, when the fluid dispersion member 22 is divided on a horizontal plane including the axis of the nozzle pipe 20, the ejection holes 2 facing the upper half of the fluid dispersion member 22 are formed.
It is preferable to arrange the ejection holes 24 so that the total opening area of the ejection holes 24 is larger than the total opening area of the ejection holes 24 facing the lower half of the fluid dispersion member 22.

In the present embodiment, the nozzle pipe 20 accommodating the fluid dispersion member 22 is attached to the leading end of the introduction pipe 4. It is also possible.

Further, in this embodiment, the negative pressure preventing hole 30 is formed in the introduction pipe 4 located inside the dilution tank 2.
A negative pressure prevention hole may be formed in the introduction pipe 4 located outside the dilution tank 2, and the negative pressure prevention hole and the inside of the dilution tank 2 may be connected by a pipe. Further, a check valve may be provided in the middle of this pipe so that the ammonia gas being blown does not flow into the dilution tank 2.

[0028]

As is apparent from the above description, according to the ammonia diluting apparatus of the present invention, a fluid dispersion member for dispersing the flow of ammonia gas is accommodated at the tip of the introduction pipe,
Since the injection hole of the ammonia gas is formed at the position facing the fluid dispersion member of the introduction pipe, the water in the dilution tank can be made to adhere to the fluid dispersion member to increase the wet area, and the flow of the ammonia gas can be increased. Can be dispersed. Therefore, the ability to dissolve ammonia gas released into the water in the dilution tank can be increased. Further, since the ammonia gas is dispersed and released into the water, it is possible to suppress the generation of vibration and noise when the bubbles are crushed.

Further, by forming a negative pressure prevention hole communicating with the upper part of the dilution tank in the introduction pipe, the gas in the dilution tank is guided to the introduction pipe through the negative pressure prevention hole when the introduction pipe has a negative pressure. This makes it possible to prevent the dilution liquid stored in the dilution tank from flowing back through the inlet tube.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an ammonia dilution device according to an embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a main part of FIG.

FIG. 3 is a cross-sectional view of a conventional ammonia dilution device.

[Explanation of symbols]

 2 Dilution tank 4 Introducing pipe 20 Nozzle pipe 22 Fluid dispersion member 24 Spray hole 30 Negative pressure prevention hole

Claims (4)

[Claims] 1. An ammonia diluting apparatus, comprising: a dilution tank in which a liquid for dilution is stored; and an introduction pipe for introducing ammonia gas into the dilution tank, wherein the ammonia gas introduced is dissolved in the liquid for dilution. An ammonia diluting device, wherein a fluid dispersion member for dispersing the flow of ammonia gas is accommodated at a distal end of the tube, and an ammonia gas ejection hole is formed at a position of the introduction tube facing the fluid dispersion member. 2. A method according to claim 1, wherein a total opening area of said ejection holes facing the downstream half of said fluid dispersion member is larger than a total opening area of said ejection holes facing the upstream half of said fluid dispersion member. The ammonia dilution device according to claim 1, wherein 3. The fluid dispersion member is disposed in a horizontal state, and the total opening area of the ejection holes facing the upper half of the fluid dispersion member is determined by the opening of the ejection holes facing the lower half of the fluid dispersion member. 3. The ammonia diluting device according to claim 1, wherein the total area is larger than the total area. 4. The ammonia diluting apparatus according to claim 1, wherein a negative pressure prevention hole communicating with an upper portion of the dilution tank is formed in the introduction pipe.