JP2003251103A - Gas-liquid separation method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gas-liquid separation method for continuously separating gas and liquid from a pressurized container, into which both of the gas and the liquid continuously flow, to take out them in separated state while keeping the level of the liquid surface in the container constant. <P>SOLUTION: Two outlets are mutually provided to the side surface of the container, in which the liquid and the gas flow continuously, at upper and lower positions, or the upper and lower parts of the container are connected by piping positioned outside the container while two outlets mutually positioned up and down are provided on the way of the piping. A flow rate control valve, or the like, is provided to the upper outlet to set the resistance of the flow passage thereof to a range enabling the whole gas and a part of the liquid to flow through the flow passage and the greater part of the liquid is taken out of the lower outlet. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packed column, a sprinkling column, a bubble column, a stirring column for absorbing a gas into a liquid, removing a gas from a liquid, or causing a chemical reaction between a gas and a liquid. The present invention relates to a method for separating and recovering gas and liquid from a container such as a liquid mixer while keeping the liquid level constant.

[0002]

2. Description of the Related Art Gas and liquid are separated from a container, such as a packed tower, a shower scrubber, a bubble tower, and a gas-liquid mixer, into which both gas and liquid continuously flow, while keeping the liquid level constant. The method of taking out the container differs depending on whether the container is operated under atmospheric pressure or under pressure.

When used at atmospheric pressure, the gas is taken out from the upper part of the container and the liquid is taken out from the lower part of the container. Especially, the gas is taken out near the height of the liquid level where the outlet of the pipe for taking out the liquid is to be held. It is possible to separate the gas and the liquid while maintaining the liquid level by discharging the liquid.

An example of such a conventional method is shown in FIG.

FIG. 1 shows an example in which gas-liquid separation is performed while maintaining the liquid level in a bubble column used for the purpose of absorbing gas.

When the container is operated under pressure, a level switch is provided in the container and an opening / closing valve is provided at the liquid outlet, and when the liquid level reaches the sensor position of the level switch, the opening / closing valve is opened. A method of closing when the liquid level drops may be used.

FIG. 4 shows an example of a bubble column using such a gas-liquid separation method.

In the method using such a level switch, the liquid level is likely to fluctuate up and down, and the stability of gas absorption or chemical reaction may be impaired.

[0009]

DISCLOSURE OF THE INVENTION The present invention continuously separates gas and liquid from a pressurized container into which both gas and liquid continuously flow, while keeping the liquid level in the container constant. An object of the present invention is to provide a gas-liquid separation method for taking out by taking out.

[0010]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides two outlets located above and below each other on a side surface of a container into which a liquid and a gas continuously flow, or an upper portion of the container. The lower part is connected by a pipe located outside the container, and two outlets located above and below each other are provided in the middle of the pipe.

A flow rate control valve or the like is provided at the upper outlet so that the resistance of the flow passage is set within a range in which the total amount of gas and a part of the liquid flow through the flow passage, and most of the lower outlet is used. Take the method of taking out the liquid.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

In each of these embodiments, a bubble column used for the purpose of dissolving gas in water or the like is assumed as a container into which gas and liquid flow.

The same method can be applied to a packed tower, a sprinkler tower, a stirring type gas-liquid mixer and the like.

FIG. 1 shows an embodiment of the present invention according to claim 1.

In the figure, liquid is supplied into the container from the upper part (4) of the container (1) through the shower (9), and gas is supplied from the lower part (5) through the bubbler (8).

A pipe (22) is provided outside the container vertically in parallel with the container, and fluid outlets are provided at two places in the middle of the pipe (22).

Although not shown, it is possible to directly attach the container to the container without using the pipes (22) for these two outlets, and the following description is similarly applied to the configurations.

Most of the liquid is taken out from the lower outlet via the back pressure control valve (12).

The total amount of gas and a part of the liquid are taken out from the upper outlet through the flow control valve (13), and the gas is taken out to the upper part (23) and the liquid to the lower part (19) by the vertically branched pipes. Be done.

In order to create such a flow state, it is necessary to adjust the opening of the flow rate control valve (13) to an appropriate range at the first stage of operation.

The adjustment can be carried out by the following procedure. 1. The flow control valve (13) is fully closed to supply liquid and gas to the container at a predetermined flow rate. When the fluctuation of the gas flow rate is predicted, the maximum gas flow rate is flown. 2. Confirm that the pressure in the container rises to the pressure adjusted by the back pressure control valve, and the gas-liquid mixed flow is discharged through the back pressure control valve. 3. Gradually open the flow control valve so that a small amount of liquid is intermittently discharged together with the gas.

After the opening of the flow rate control valve is set by this method, a small amount of liquid and gas are continuously discharged intermittently from the upper outlet. Only liquid is discharged from the lower outlet. Further, the liquid level is stably maintained near the height of the upper outlet.

The reason why such an action occurs is basically that the resistance of the flow rate control valve has a difference of several tens of times between the liquid and the gas. The point will be described below.

When the opening of the flow rate control valve is set by the above method, the gas in the container is discharged through the flow rate control valve at a flow rate higher than the flow rate of the inflowing gas (under the pressure controlled by the back pressure control valve). Therefore, the volume of the gas phase portion in the container decreases,
Along with that, the liquid level rises.

When the liquid level rises, the liquid flows into the flow control valve. At that moment, the discharge of gas is stopped, and as a result, the amount of gas in the container increases and the liquid level is pushed down.
Then, the gas expels the liquid in the flow rate control valve and is discharged again through the flow rate control valve at a flow rate higher than the flow rate of the inflowing gas.

By repeating such a reduction, the liquid level is maintained near the upper outlet.

FIG. 2 shows an embodiment of the present invention according to claim 2.

In the figure, the liquid is supplied from the upper part (4) of the container (1) through the shower (9) and the gas is supplied from the lower part (5) through the bubbler (8).

A pipe (20) is provided outside the container vertically in parallel with the container, and two fluid outlets are provided at upper and lower locations along the pipe (20).

Although not shown in the drawing, a configuration in which the pipe (20) is not used for these two outlets and directly attached to the container is also possible, and the following description is similarly applied to the configurations.

Most of the liquid is taken out from the lower outlet through the flow control valve (12).

The total amount of gas and a part of the liquid are taken out from the upper outlet through the flow rate control valve (13) to the outside, and the gas is taken out to the upper part (21) and the lower part (19) by the vertically branched pipes. Be done.

In order to create such a flow state, it is necessary to adjust the openings of the flow rate control valves (13) and (24) to an appropriate range at the initial stage of operation.

The adjustment can be performed by the following procedure. 1. The flow rate control valves (13) and (15) are fully closed to supply gas to the container at a predetermined flow rate. When the fluctuation of the gas flow rate is predicted, the maximum gas flow rate is flown. 2. When the pressure in the container rises to the pressure adjusted by the pressure controller (14), the flow rate control valve (13) is gradually opened until gas and a small amount of liquid flow. 3. Gradually open the flow control valve (15) until the liquid flows at the specified flow rate.

In this way, the flow control valves (13) and (1
After setting the opening of 5), a small amount of liquid and gas are constantly discharged intermittently from the upper outlet. Only liquid is discharged from the lower outlet. Further, the liquid level is stably maintained near the height of the upper outlet.

Basically, such an action occurs when the resistance of the flow rate control valve has a difference of several tens of times between liquid and gas as in the case of FIG.

[0038]

According to the present invention, a gas such as a pressurized gas absorption tower or a chemical reaction container into which both a gas and a liquid continuously flow is provided while maintaining a constant liquid level in the container. And liquid can be continuously separated and taken out.

[Brief description of drawings]

FIG. 1 shows an embodiment according to claim 1.

FIG. 2 shows an embodiment according to claim 1.

FIG. 3 shows a conventional embodiment of a method for separating gas and liquid from a container operated at atmospheric pressure.

FIG. 4 shows a conventional embodiment of a method for separating gas and liquid from a container operated under pressure.

[Explanation of symbols]

1 container (bubble tower) 2 liquid level 3 bubbles 4 Liquid inlet 5 gas inlet 6 gas outlet 7 liquid outlet 8 Bubbler 9 showers 10 level switch 11 Automatic open / close valve 12 Back pressure control valve 13 Flow control valve 14 Pressure regulator 15 Flow control valve 16 gas outlet 17 Liquid outlet 18 Gas-liquid mixing outlet 19 Partial liquid outlet 20 piping 21 gas outlet

Claims (2)

[Claims] 1. A constant internal pressure above atmospheric pressure,
A method for continuously separating and extracting gas and liquid from a container into which both gas and liquid continuously flow, while maintaining a constant liquid level in the container, and having the following requirements: What to do. (A) Two outlets located above and below each other are provided on the side surface of the container, or the upper and lower parts of the container are connected by a pipe located outside the container, and they are located above and below each other in the middle of the pipe. There are two outlets for (B) A bottleneck such as a flow control valve or an orifice is provided at the upper one of the two outlets, and the resistance of the bottleneck is adjusted so that the entire gas and a part of the liquid flow out from the outlet. There is. (C) A back pressure adjusting valve is provided at the lower one of the two outlets, and is provided with a function of discharging the liquid while keeping the pressure in the container constant. 2. A constant internal pressure above atmospheric pressure is maintained,
From a container into which both gas and liquid continuously flow, a method of continuously separating and extracting gas and liquid while maintaining a constant liquid level in the container and having the following requirements: What to do. (A) The pressure inside the container is kept constant by a pressure regulator provided in the flow path of the liquid flowing into the container. (B) Two outlets located above and below each other are provided on the side surface of the container, or the upper and lower parts of the container are connected by a pipe located outside the container, and they are located above and below each other in the middle of the pipe. There are two outlets for (C) Of the two outlets, a bottleneck such as a flow control valve or an orifice is provided at the upper outlet, and the resistance of the bottleneck is such that the total amount of gas and a part of the liquid flow out from the upper outlet. It is adjusted and fixed. (D) A flow rate adjusting valve is provided at the lower one of the two outlets, and the flow rate of the liquid taken out to the outside is adjusted by adjusting the opening thereof.