JP5044244B2 - Gas-liquid mixing blowing nozzle - Google Patents

Description

In the present invention, a liquid containing a dissolved substance or a suspended solid or a liquid in which a dissolved substance or a solid is generated by a gas-liquid reaction is fed upward. The present invention relates to a gas-liquid mixing blowout nozzle configured such that a gas inlet pipe into which gas is supplied is communicated and connected to a location so that the gas-liquid mixed fluid can be blown upward into the bubble column from its bottom .

The gas-liquid mixing blowing nozzle can blow the gas-liquid mixed fluid in which the gas is mixed into the liquid upward in the bubble column that is processed by bringing the liquid into contact with air or a gas other than air. In addition, a gas inlet tube into which a gas is supplied is connected to a midway portion of the liquid inlet tube into which the liquid is supplied.
As shown in FIG. 8, the conventional gas-liquid mixing blowing nozzle has a gas inlet pipe 14 having a diameter substantially equal to that of the liquid inlet pipe 13 at a midpoint of the straight pipe liquid inlet pipe 13 having a constant diameter. The gas B fed into the gas feed pipe 14 is connected to the liquid feed pipe 13 from a direction orthogonal to the tube axis X of the liquid feed pipe 13 or at a larger angle than that inside the liquid feed pipe 13. The gas outlet 20 of the gas inlet tube 14 is opened on the inner peripheral surface of the liquid inlet tube 13 so that the liquid inlet tube 13 can mix the gas-liquid mixed fluid C at a predetermined flow rate. Is set to a diameter that can be blown into the bubble column (see, for example, Patent Document 1).

Japanese Examined Patent Publication No. 52-15064

Since the gas outlet 20 of the gas inlet pipe 14 is opened to the side of the liquid inlet pipe 13, as shown in FIG. The liquid A flows back into the tube 14 or the liquid a is easily scattered in the gas inlet tube 14, and the dissolved substance and the suspended solid are contained in the liquid A fed into the liquid inlet tube 13. When dissolved substances and solids are generated by the reaction between the liquid A and the gas B mixed in the liquid A, the dissolved substances and suspended solids in these liquids are close to the gas outlet 20. The gas adhering pipe 14 adheres to and adheres to the gas inlet pipe 14, and further, the adhering substance D is thickened, which easily leads to flow obstruction and blockage.
Further, the gas B flowing into the liquid inlet tube 13 from the gas outlet 20 flows toward the gas inlet tube 14 side, and it is difficult for the gas B to be dispersed and mixed in the entire liquid flowing through the liquid inlet tube 13. As a result, there is a defect that the gas-liquid mixed fluid C in which the gas B is uniformly mixed is difficult to blow into the bubble column, and this defect becomes more prominent as the diameter of the liquid inlet tube 13 increases.
The present invention has been made in view of the above circumstances, and does not particularly impede the flow of the liquid or gas-liquid mixed fluid in the liquid inlet pipe. Even if a suspended solid is included or a dissolved substance or solid is generated by the reaction between the liquid and the gas mixed in the liquid, the dissolved substance or suspended solid will remain in the gas inlet tube. It is another object of the present invention to provide a gas-liquid mixing blowout nozzle that is difficult to adhere to the gas and easily blows a gas-liquid mixed fluid in which gas is uniformly mixed into the bubble column.

A first characteristic configuration of the present invention is a liquid in which a dissolved substance or a solid substance to be suspended is contained or a liquid in which a dissolved substance or a solid substance is generated by a gas-liquid reaction is sent upward. A gas-liquid mixing blowout nozzle configured to connect a gas inlet pipe through which gas is supplied to a midway portion of the inlet pipe so that the gas-liquid mixed fluid can be blown upward into the bubble column from its bottom. The liquid feed pipe is configured by connecting a series of upstream large diameter parts and a downstream small diameter part having an inner diameter smaller than the large diameter part by a reducer, and the gas feed pipe The inner diameter is smaller than the inner diameter of the small-diameter portion , and the tube axis is substantially intersected at an acute angle with the tube axis of the large-diameter portion with the tip side inclined obliquely downstream. said allowed to enter to the vicinity of the tube axis of the liquid inlet tube into the large-diameter portion, of the liquid inlet tube Connected to the middle portion, the tube cross-sectional area along the radial direction of the large diameter portion, by subtracting the projected area in the pipe axis direction of the large-diameter portion in a gas inlet tube part that enters into said large diameter portion The inner diameter of the large-diameter portion is set so that the subtracted area is equal to or larger than the cross-sectional area in the tube along the radial direction of the small-diameter portion , and a part of the tip of the gas inlet tube is the large-diameter portion or the The gas inlet pipe is inserted into the large-diameter portion so as to contact the inner peripheral surface of the reducer at substantially one point .

[Action and effect]
The pipe shaft of the liquid feed pipe is placed in the large diameter portion in a posture in which the gas feed pipe is inclined obliquely toward the downstream side of the gas feed pipe and the pipe axis substantially intersects the pipe core of the large diameter portion at an acute angle. thereby enter to the vicinity of the heart, so are close to the middle portion of the liquid inlet tube, the opening of the gas inlet tube is positioned slightly rearward of the gas-liquid confluence, from the nearby mixing point of gases into liquids, It is difficult for the liquid to flow back into the gas inlet tube or the liquid droplets to be scattered into the gas inlet tube.
Moreover, a liquid inlet tube, and a large diameter portion of the upstream side and a small diameter portion of the inner diameter than the large diameter portion is smaller downstream constructed by connecting a series with reducer, small inner diameter of the gas inlet tube Since the tip side is inserted into the large-diameter part , the gas flow rate in the gas inlet pipe is increased without unnecessarily increasing the amount of gas supplied. Thus, it is possible to effectively prevent the backflow of liquid into the gas inlet tube and the scattering of liquid droplets into the gas inlet tube.
Also, let the gas inlet tube enter the liquid inlet tube at the tip side and connect it to the middle of the liquid inlet tube to mix gas into the liquid near the tube axis of the liquid inlet tube. Therefore , it is easy to disperse and mix the gas in the entire liquid flowing through the liquid inlet pipe.
Furthermore, the tube cross-sectional area along the radial direction of the large diameter portion, is subtracted the area obtained by subtracting the projected area of the large diameter portion of the pipe axis direction in the gas inlet tube portion that enters into the large-diameter portion, the small diameter portion The inner diameter of the large-diameter portion is set so as to be equal to or larger than the cross-sectional area in the tube along the radial direction of the tube, so that the distal end side of the gas inlet tube is inserted into the large-diameter portion , while in the liquid inlet tube There is little risk of increasing the pressure loss by obstructing the flow of the liquid or gas-liquid mixed fluid.
Therefore, without particularly obstructing the flow of the liquid or gas-liquid mixed fluid in the liquid inlet pipe, the liquid sent into the liquid inlet pipe contains dissolved substances or suspended solids, When dissolved substances and solids are generated by the reaction between the liquid and the gas mixed in the liquid, the dissolved substances and suspended solids are difficult to adhere to the gas inlet tube, and the gas is mixed uniformly. It is easy to blow the gas-liquid mixed fluid into the bubble column.
In addition, because the gas inlet tube is inserted into the large diameter portion so that a part of the tip of the gas inlet tube is in contact with the large diameter portion or the inner peripheral surface of the reducer at approximately one point. In order to prevent the flow of the liquid in the liquid inlet tube as much as possible, the amount of gas entering the large diameter portion of the gas inlet tube can be reduced and the gas that has entered the large diameter portion or the reducer Since the opening of the gas inlet pipe faces the downstream side of the liquid inlet pipe by the inlet pipe portion, the effect of preventing the backflow of the liquid to the gas inlet pipe can also be obtained.

The second characteristic configuration of the present invention is the distal end surface of the gas inlet tube that enters into the large-diameter portion, a point which had been formed in a shape substantially along the pipe axis of the large diameter portion.

[Action and effect]
The distal end surface of the gas inlet tube that enters into the large-diameter portion, so is formed in a substantially along the shape in the pipe axis of the large diameter portion, is less pressure drop along the pipe axis of the large diameter portion liquid Easy to flow in the state.

According to a third characteristic configuration of the present invention, the liquid inlet pipe has a pipe diameter reduced on the upstream side of the large diameter portion using another reducer having the same diameter on the large diameter side as the reducer. It is in that it is a thing.

[Action and effect]
When a conventional gas-liquid mixing blowing nozzle already installed is replaced with the gas-liquid mixing blowing nozzle according to the present invention, the diameter of the liquid inlet tube is often the same as the diameter of the blowing portion. Therefore, by joining another reducer to the reducer and joining the liquid feed pipe through the reducer, the projected area in the tube axis direction of the gas feed pipe is subtracted from the pipe cross-sectional area along the radial direction. The area can be ensured to be equal to or larger than the cross-sectional area along the radial direction of the small-diameter pipe, and the gas-liquid mixing blowing nozzle according to the present invention can be mounted.

The 4th characteristic structure of this invention exists in the point which has set the flow velocity of the gas in the said gas inflow pipe | tube to 15 m / s or more.

[Action and effect]
In the gas-liquid mixing blowout nozzle configured to be able to blow the gas-liquid mixed fluid into the bubble column upward from the bottom thereof, for example, when the gas flow velocity in the gas inlet pipe is set to about 2 m / s, Backflow of liquid into the gas inlet pipe and scattering of liquid droplets into the gas inlet pipe occur, but since the gas flow velocity in the gas inlet pipe is set to 15 m / s or more, Compared with the flow velocity, the flow velocity of gas is remarkably large, and it is possible to effectively prevent the backflow of liquid into the gas inlet tube and the scattering of liquid droplets into the gas inlet tube.

A fifth characteristic configuration of the present invention is that the bubble column is a desulfurization liquid regeneration tower in a fuel gas desulfurization facility, the liquid is a desulfurization liquid, and the gas is air to be reacted with the desulfurization liquid. .

[Action and effect]
The bubble column is a regeneration column for the desulfurization liquid in the fuel gas desulfurization facility, the liquid is the desulfurization liquid, and the gas is the air that reacts with the desulfurization liquid. Dissolved substances and suspended solids are contained, and dissolved substances and solids are generated by the reaction of the desulfurization liquid and air, but the flow of the desulfurization liquid and gas-liquid mixed fluid in the liquid inlet pipe is particularly hindered. Therefore, dissolved substances and suspended solids are unlikely to adhere to the gas inlet tube, and a gas-liquid mixed fluid in which air is uniformly mixed is easily blown into the regeneration tower.

Embodiments of the present invention will be described below with reference to the drawings. In the drawings, the parts indicated by the same reference numerals as those in the conventional example indicate the same or corresponding parts.
[First Embodiment]
FIG. 1 shows a desulfurization solution in a desulfurization facility for a fuel gas to be desulfurized by bringing hydrogen sulfide (H ₂ S) into contact with an alkaline desulfurization solution and dissolving hydrogen sulfide as a dissolved component in the desulfurization solution. A desulfurization liquid is shown in order to show a regenerator, in which hydrogen sulfide in the desulfurization liquid is oxidized and decomposed by air bubbles, and the oxidation generates sulfur (S) as a solid substance and dissolved substances such as thiosulfate. A desulfurization liquid regeneration tower (an example of a bubble tower) 1 that oxidizes and decomposes hydrogen sulfide in air and decomposes it, and a desulfurization liquid (an example of a liquid) A in which hydrogen sulfide is dissolved. A gas-liquid mixing blowout nozzle 3 according to the present invention for blowing the mixed gas-liquid mixed fluid C into the regeneration tower 1 is provided.

  The regeneration tower 1 is connected to a gas-liquid mixing blowing nozzle 3 so that its blowing port 4 opens at the bottom, and a gas-liquid mixed fluid C in which air B is mixed in the desulfurization liquid A is blown from the bottom. The outlet of the desulfurization liquid A is connected upward.

  Then, hydrogen sulfide in the desulfurization liquid of the gas-liquid mixed fluid C blown into the regeneration tower 1 is oxidized by air, and the desulfurization liquid containing solid sulfur and dissolved salt generated by the oxidation is extracted as the regeneration desulfurization liquid. It is configured.

  As shown in FIG. 2, the gas-liquid mixing blow-out nozzle 3 has a cylindrical straight tubular gas feed to which air B is fed at a midpoint of a cylindrical liquid feed pipe 13 into which the desulfurization liquid A is fed. The inlet pipe 14 is connected in communication.

The liquid inlet tube 13, a straight pipe large-diameter portion 15 on the upstream side, with reducers 17 and straight tube small-diameter portion 16 of the inner diameter is smaller downstream of the large-diameter portion 15, a large diameter tube of the large-diameter portion 15 The shaft core X1 and the small- diameter tube shaft core X2 of the small- diameter portion 16 are connected in series, and the gas inlet tube 14 has an inner diameter smaller than the inner diameter of the small-diameter portion 16. The posture in which the tube axis Y crosses at an acute angle θ with respect to the tube axis X1 of the large diameter portion 15 with the tip end thereof being inclined obliquely downstream, that is, the tube axis Y of the gas inlet tube 14 is The large-diameter tube axis X1 is inserted into the large-diameter portion 15 to the vicinity of the tube axis center of the liquid-injection tube in an attitude that intersects with the acute angle θ obliquely downstream from the insertion point into the liquid-inlet tube 13. Then, it is connected to an intermediate position of the liquid inlet pipe 13.

Further, as shown in FIG. 2 (b), the tube cross-sectional area along the radial direction of the large diameter portion 15, a large diameter portion axial direction X1 of the gas inlet tube portion 18 that has entered the large-diameter portion 15 The inner diameter of the large-diameter portion 15 is set so that a subtracted area (hatched portion in the figure) S obtained by subtracting the projected area is equal to or larger than the cross-sectional area in the tube along the radial direction of the small-diameter portion 16.

  Then, the flow rate of the air B in the gas inlet pipe 14 is 15 m / s so that the backflow of the desulfurization liquid A into the gas inlet pipe 14 and the scattering of the liquid a into the gas inlet pipe 14 are reduced. The gas-liquid mixed fluid C in which the air B is mixed in the desulfurization liquid A is configured so as to be blown into the regeneration tower 1.

3, as a part 21 of the front end surface 19 of the gas inlet tube 14 is in contact with substantially one point on the inner peripheral surface of the inner peripheral surface or reducer 17 of the large diameter portion 15, a gas inlet tube 14 large diameter portion 15 is included.

According to the present embodiment, it is possible to reduce the amount of the gas inlet pipe 14 entering the large diameter portion 1 so that the flow of the desulfurization liquid A in the liquid inlet pipe 13 is not hindered as much as possible.

[Reference example]
FIG. 4 shows another embodiment of the gas-liquid mixing blowout nozzle 3 according to the present invention, in which the front end surface 19 of the gas inlet pipe 14 is formed by substantially two surfaces, and the front end surface portion 19a on one downstream side is made large. The inner surface of the penetrating portion of the diameter portion 15 or the reducer 17 is shaped along the inner surface, and the other upstream end surface portion 19b is orthogonal or substantially orthogonal to the tube axis Y. The gas inlet tube 14 is inserted into the large-diameter portion 15 in the shape of the shape.

According to this embodiment , compared with 1st Embodiment , the amount of penetration | invasion to the large diameter part 1 of the gas inflow tube 14 can be decreased further, and the flow of the desulfurization liquid A can be prevented more.
Other configurations are the same as those of the first embodiment.

5, a large diameter portion 15 and the small diameter portion 16, is the difference Z only eccentric to each other between the inner periphery side radius of the inner peripheral side radius and a small-diameter portion 16 of their axial X1, X2 large-diameter portion 15 Te, connected to a series in reducer 17, the distal end side of the gas inlet tube 14, from the large diameter portion axial X1 side than the small-diameter portion axial X2, are allowed to enter the large-diameter portion 15.

Nozzle 3 blowout mixture the gas-liquid has a large diameter portion axial X1 and the small diameter portion axial X2 and along a vertical direction, may be communicated connectable to the bottom of the regenerator 1 small-diameter portion 16 in the present embodiment, the large-diameter portion axial X1 and the small diameter portion axial X2 are substantially along a horizontal direction, and along a large-diameter portion axial X1 and the small diameter portion axial X2 vertically up and down disposed in large diameter portion axial X1 is to be located above the small-diameter portion axial X2, it is communicated connectable to the small diameter portion 16 on the lateral side of the regenerator 1.
Other configurations are the same as those of the first embodiment.

In FIG. 6, the distal end surface 19 of the gas inlet tube 14 entering the large diameter portion 15 is formed in a shape substantially along the axis X <b> 1 of the large diameter portion 15.
Other configurations are the same as those of the first embodiment.

FIG. 7 shows a small-diameter end 21 having an inner diameter substantially the same as the inner diameter of the liquid inlet tube 13 and a larger diameter larger than the smaller-diameter end 21 at an intermediate position of the liquid inlet tube 13 having a substantially constant inner diameter. Two reducers 17 (17a, 17b) having end portions 22 are connected to a large- diameter portion 20 formed by concentrically connecting large-diameter end portions 22 to each other. is there.

Then, the gas inlet tube 14 is formed so that its inner diameter is smaller than the inner diameter of the liquid inlet tube 13, and the tube axis Y is the tube axis of the enlarged diameter portion 20 with its tip side inclined obliquely downstream. It is inserted into the enlarged diameter portion 20 in a posture substantially intersecting with the core X at an acute angle (an angle of 45 degrees in the present embodiment) θ and connected to the enlarged diameter portion 20 .

From the cross-sectional area in the pipe along the radial direction at the large-diameter end 22 of the large- diameter portion 20 , the projection of the large- diameter portion 20 in the gas inlet pipe portion 18 entering the large- diameter portion 20 in the direction of the tube axis X 1. The inner diameter of the large-diameter end 22 is set so that the subtracted area obtained by subtracting the area is equal to or larger than the cross-sectional area in the pipe along the radial direction of the liquid inlet pipe 13.
Other configurations are the same as those of the first embodiment.

  When the gas-liquid mixing blowing nozzle (this embodiment nozzle) 3 according to this embodiment shown in FIG. 7 is attached to the regeneration tower 1 of the desulfurization apparatus shown in FIG. 1, the conventional gas-liquid mixing blowing nozzle (shown in FIG. 8) ( For each of the cases where the conventional nozzle) 3 was attached, an experimental operation was performed over a period of about 6 months.

Experimental conditions are shown below.
This embodiment nozzle Conventional nozzle Liquid feed pipe inner diameter 41.2mm 41.2mm
Outer diameter 41.2mm 41.2mm
Internal diameter of the large diameter end of the reducer 49.5mm -----
Inner diameter of gas inlet pipe 16.2mm 27.2mm
Angle formed by each gas and liquid feed pipe 45 degrees 90 degrees Liquid type Desulfurization liquid Desulfurization liquid gas type Air Air liquid feed flow rate 35m ³ / h 35m ³ / h
Gas flow rate 11m ³ / h 11m ³ / h
Flow rate at the time of gas delivery 15m / s 5.4m / s

  As a result of the above experimental operation, in the conventional nozzle, it was recognized that the solid material that grew in a branch shape over the entire cross section of the gas inlet tube 14 was generated, but in the nozzle of the present embodiment, the solid was formed on the inner surface of the gas inlet tube 14. There was no adhesion or formation of objects.

[Other Embodiments]
1. The gas-liquid mixing blowout nozzle according to the present invention communicates with a gas inlet pipe through which gas is fed into a midway position of a liquid inlet pipe into which a liquid containing dissolved substances or suspended solids is fed. It may be connected.
2. The gas-liquid mixing blowout nozzle according to the present invention includes a dissolved substance or a suspended solid, and is in the middle of a liquid feed pipe into which a liquid in which a dissolved substance or a solid is generated by a gas-liquid reaction is fed. A gas inlet pipe into which gas is introduced may be connected to the place in communication.
3. The gas-liquid mixing blowout nozzle according to the present invention may be configured so that a gas-liquid mixed fluid can be blown into a bubble column used for various uses other than the desulfurization solution regeneration column.

Schematic diagram of playback device (B) Vertical cross-sectional view of gas-liquid mixing blowout nozzle, (b) View along line II-II in (b) The longitudinal cross-sectional view of the gas-liquid mixing blowing nozzle which shows 2nd Embodiment Vertical sectional view of a gas-liquid mixing blowout nozzle showing a reference example Vertical sectional view of a gas-liquid mixing blowout nozzle showing a reference example Vertical sectional view of a gas-liquid mixing blowout nozzle showing a reference example Vertical sectional view of a gas-liquid mixing blowout nozzle showing a reference example Illustration of prior art

1 Bubble tower (desulfurization liquid regeneration tower)
DESCRIPTION OF SYMBOLS 13 Liquid inlet pipe 14 Gas inlet pipe 15 Large diameter part 16 Small diameter part 17 Reducer 18 Gas inlet pipe part 19 Tip surface 19a One tip surface part 19b The other tip surface part A Liquid (desulfurization liquid)
B gas (air)
C gas-liquid mixture fluid S subtracted area X1 axial (large diameter portion axial)
X2 axial (the small-diameter portion axial)
Y tube axis Z difference θ acute angle

Claims (5)

A liquid containing a dissolved substance or a suspended solid, or a liquid in which a dissolved substance or a solid is generated by a gas-liquid reaction is sent upward, and a gas is placed in the middle of the liquid feed pipe. Is a gas-liquid mixing blowout nozzle configured to connect a gas inlet pipe into which gas is fed and to allow the gas-liquid mixed fluid to be blown upward from the bottom of the bubble column,
The liquid feed pipe is configured by connecting a series of upstream large-diameter portions and downstream small-diameter portions having an inner diameter smaller than the large-diameter portions with a reducer,
The gas feed pipe is formed so that its inner diameter is smaller than the inner diameter of the small- diameter portion , and the tube axis is at an acute angle with respect to the tube axis of the large-diameter portion with its tip side inclined obliquely downstream. In the posture that substantially intersects with in the large diameter portion to enter the vicinity of the tube axis of the liquid inlet pipe , connected to the middle part of the liquid inlet pipe ,
Wherein the tube cross-sectional area along the radial direction of the large diameter portion, the is subtracted area obtained by subtracting the projected area in the pipe axis direction of the large-diameter portion in a gas inlet tube portion that enters into the large-diameter portion, said Set the inner diameter of the large-diameter portion to be equal to or greater than the cross-sectional area in the tube along the radial direction of the small-diameter portion ,
The gas inlet tube is inserted into the large diameter portion so that a part of the tip of the gas inlet tube is in contact with the large diameter portion or the inner peripheral surface of the reducer at substantially one point. Gas-liquid mixing blowing nozzle. The gas-liquid mixing blowout nozzle according to claim 1, wherein a front end surface of the gas inlet pipe entering the large diameter portion is formed in a shape substantially along a tube axis of the large diameter portion . 3. The pipe diameter is reduced by using another reducer having the same diameter on the large diameter side as that of the reducer on the upstream side of the large diameter portion. mixed balloon nozzle gas-liquid described. The gas-liquid mixing blowout nozzle according to any one of claims 1 to 3 , wherein a gas flow velocity in the gas inlet pipe is set to 15 m / s or more. The bubble column is a desulfurization liquid regeneration column in a fuel gas desulfurization facility;
The gas-liquid mixing blowout nozzle according to any one of claims 1 to 4 , wherein the liquid is a desulfurization liquid, and the gas is air that reacts with the desulfurization liquid.

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