JPS6020053B2 - fluid contact device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for efficiently bringing liquids into contact with each other or with gas and liquid.

When performing fluid contact, such as gas-liquid contact, it is always important to effectively disperse the gas in the liquid to increase contact absorption efficiency.

Conventionally, as a method for dispersing gas or other liquid in a liquid, a method of dispersing and injecting gas or liquid through a porous pipe or a porous sintered body has been widely used.

In order to efficiently disperse gas and liquid using this method, the size of the bubbles when the gas comes into contact with the liquid should be reduced to 4.
It is necessary to increase the contact area by reducing the thickness. For this purpose, it is necessary to reduce the pore diameter of the porous tube, and as a result, the ejection port is particularly likely to become clogged, for example, when a precipitate is generated due to a reaction between liquid and gas. If the pore size is made large to avoid this, the disadvantage is that the bubbles become large and the gas-liquid contact efficiency deteriorates. The inventors of the present invention have conducted various studies on a fluid contact device that can improve the drawbacks of the conventional method and provide good contact efficiency with less blockage. It consists of a bowl-shaped body connected to the supply pipe and a plate in contact with the bowl-shaped body, and the slit area on the outer periphery between the bowl-shaped body and the plate is made variable depending on the gas load. If gas or a premixed gas-liquid mixture is fed through the supply port connected to the container, very fine air bubbles or gas-liquid bubbles will be ejected into the liquid, resulting in excellent fluid contact. We came to the present invention by learning that this is possible.

Furthermore, in the sealed tank divided into two upper and lower chambers, the mixer makes good fluid contact in the lower chamber, and multiple nozzles are provided in the upper chamber to eject liquid in the circumferential direction, and the fluid from the lower chamber is The present invention was completed based on the knowledge that a highly efficient fluid contact effect can be obtained by dispersing and spraying the liquid using this nozzle. That is, the gist of the present invention consists of a fluid contact tank and a mixer installed in the fluid contact tank, and the mixer includes a rigid retaining body connected to a fluid supply pipe and a plate in contact with the rigid retaining body. The dispersion nozzle has a slit for ejecting fluid on the outer periphery between the bowl-shaped body and the plate, the slit has a structure whose closed area changes depending on the pressure of the fluid, and the dispersion nozzle has a lower end with a lower chamber. This fluid contact device has a structure in which the upper part penetrates through the periphery and disperses liquid on the outer periphery.

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a schematic diagram showing an example of the simplest device of the present invention. In the examples shown in FIG. 1 and FIG. 2, which will be described later, a case will be described in which an alkaline liquid is brought into contact with an acidic gas for neutralization treatment. 1 is a liquid inlet, 2 is a gas inlet, 3 is a premixer, and 4 is a moat mixer shown in FIGS. 3 and 4, which will be described later.

The open tank 5 is filled with water or a specified liquid in advance, or in some cases, when it is empty, an alkaline liquid such as cement wastewater is introduced from the liquid inlet 1, and an acidic gas such as C02 gas is introduced from the gas inlet 2. and premixer 3
The gas-liquid enters the mixer 4 while being partially premixed using a (ejector type), and is ejected from the slit into a fine gas-liquid mixture bubble into the rice cake 5.

Immediately after ejection, gas absorption is almost complete, but if some unreacted gas remains due to gas-liquid mixing conditions, such as flow rate, it becomes fine bubbles and is absorbed into the gas 5. Absorption occurs through gas-liquid contact while rising through the liquid. In this example, the alkaline liquid and acidic gas are premixed, but in some cases, sufficient absorption can be achieved even if no premixing is performed and only the acidic gas is injected directly into the alkaline liquid in the tank through a mixer. . FIG. 2 is a schematic diagram showing another example of the present invention.

In the figure, 6 is a liquid inlet, 7 is a gas inlet, 8 is a premixer, and 9 is a mixer. Reference numeral 10 denotes a pressure-resistant sealed contact tank, which is divided into two upper and lower chambers.

11 is closed to the upper chamber, and the upper part has a structure for dispersing and spouting liquid onto the outer periphery.

The alkaline liquid and acidic gas pressurized in the pump chamber are introduced through the liquid inlets 6 and 7, respectively, and are partially mixed in the premixer 8 in the conduit, and when they are ejected from the slit part of the mixer 9, fine gas and liquid are formed. Since the foam is mixed, most of the contact is good near the spout, but if some remains unabsorbed or unreacted, the bubbles rise in the liquid in the contact tank 10 in the form of fine bubbles. Very effective contact absorption is achieved by the absorption effect due to fragmentation and the pressurization by the back pressure of the overlapping nozzle, which also serves as a physical absorption effect.

Furthermore, even if absorption is not complete due to inadequate operating conditions and the absorbed gas remains in the upper part of the lower chamber of the contact tank 10, the liquid containing gas in the lower chamber will be pushed up from the leg of the nozzle 11. The gas is injected toward the outer periphery to perform absorption, and also comes into contact with unreacted gas present in the upper chamber to contribute to the absorption reaction. The existence of the outlet 13 allows the exit atmosphere to undergo a mist-like absorption reaction by the nozzle 11 in the lateral interior, and gives the liquid and gas passing through the outlet 13 a chance for a final absorption reaction. In this way, the alkaline liquid is completely neutralized and discharged harmlessly. Figures 3 and 4 are examples of mixers installed in the apparatus of the present invention.

FIG. 3 shows an example of a mixer in which the fluid ejection gap is variable. Two bowl-shaped rigid bodies are connected to the fluid supply port 21 and are integrated with bolts 23 that set the slit plate 22. The slit plate 22 is a rigid flat plate connected to a pipe-shaped guide/stopper 24. 25 is a spring, 26 is a packing, 27 is a washer, 2
8 is a vertical nut.

When fluid enters through the fluid inlet 21 and pressure is applied, the slit plate 22 opens depending on the state of the fluid load, and finely divided gas-liquid bubbles are ejected over the entire circumference. Guide and stopper 2
4 serves as a guide designed to provide a uniform gap over the entire circumference when the slit plate 22 is opened, and the slit plate 2
It also serves as a stopper when 2 is closed. When the liquid does not flow, the slit plate 22 comes into close contact with the surface of the rigid body 20 due to the elasticity of the springer 25, and the slit is closed.
FIG. 4 is a schematic diagram showing another example of the mixer.

29 is a rigid, slightly shallow bowl-shaped body connected to the fluid inlet 30 and the fixing bolt 32 of the slit plate 31.

33 is a slit plate stopper fixed to the fixing bolt 32.

31 is a slit plate made of a movable member, and 34 is a nut that holds the slit plate 31.

A plate 33 serves as a stopper for the slit plate 31 and is fixed to the bolt 32, and the slit plate 31 is held between nuts 34. When fluid is introduced into the bowl-shaped rigid body 29 that is slightly shallower than the fluid inlet 30, the slit plate 31 opens due to the pressure, forming a V-shaped slit that widens outward. By appropriately adjusting the fluid pressure, finely divided gas-liquid bubbles are injected from the entire circumference to achieve good gas-liquid contact. The apparatus of the present invention can be applied to neutralize alkaline solutions such as cement wastewater with acidic gases such as carbon dioxide gas, or to other general gas absorption operations, and the operating pressure of the apparatus is set at a pressure equal to that of the liquid and gas to be treated. Depending on the composition, either normal pressure or pressurized pressure may be used.

Each member constituting the apparatus of the present invention should be selected and used appropriately depending on the type of liquid and gas to be treated and operating conditions, but the tank is usually made of metal, and the fluid supply pipe of the mixer and For example, a rigid body such as metal or plastic is used for the bowl-shaped portion, and a rigid metal, plastic, movable rubber, elastic plastic, or the like is used for the slit plate.

By using the device of the present invention, fluid contact such as absorption and removal of harmful components in exhaust gas or neutralization of waste liquid can be carried out efficiently with simple operations. □Fluid contact devices that combine a mixer with adjustable area and a dispersion nozzle are highly effective for many purposes. Furthermore, since this device can be made small and compact, it can be conveniently used as a portable device.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing one example of the device of the present invention, and FIG. 2 is a schematic diagram of another example of the device. 3 and 4 are schematic diagrams showing examples of mixers.
'Figure next Figure 2 Figure O 3 Figure O 4

Claims (1)

[Claims] 1. Consists of an open tank and a mixer installed in the tank,
The mixer is composed of a rigid bowl-shaped body connected to a fluid supply pipe and a plate in contact with the rigid bowl-shaped body, and has a slit on the outer periphery between the bowl-shaped body and the plate for spouting the fluid. A fluid contact device whose opening area changes depending on pressure. 2. The device according to claim 1, wherein the mixer comprises a rigid bowl-shaped body and a plate, both of which are connected via a spring so as to be openable and closable. 3. The device of claim 1, wherein the mixer comprises a rigid bowl-like body and a plate of sheet-like flexible members. 4 The sealed tank is divided into two chambers, upper and lower, with a mixer in the lower part of the lower chamber and a plurality of dispersion nozzles and a fluid outlet in the upper chamber, the mixer being a rigid bowl-shaped body connected to a fluid supply pipe. and a plate in contact with the bowl-shaped body, and has a slit for spouting fluid on the outer periphery between the bowl-shaped body and the plate, the slit has a structure whose opening area changes depending on pressure, and the nozzle has a lower end. A fluid contact device with a structure that penetrates the lower chamber and opens toward the outer circumference at the top.