JPH06178908A - Device for separating liquid from gas by utilizing cyclone and permeable membrane - Google Patents

Abstract

PURPOSE:To recover the liquid components in fluid through a permeable membrane into a container and to take out gaseous fluid after the recovery by providing a spiral gas passage in the container, forming the outer wall surface of the gas passage as the permeable membrane and passing the gaseous fluid therethrough at a high velocity CONSTITUTION:A gas passage member 7 consisting of nearly a circular column or cylinder is disposed in the hermetic pace 6 in the container 2. A gas passage groove 8 is formed spirally on the outer periphery of the gas passage member 7. The outer open surface 14 of the spiral gas passage groove 8 is closed by the permeable membrane 15 mounted on the outer surface of the gas passage member 7. The liquid components sticking to the gas passage groove 8 side of the permeable membrane 15 on the outer peripheral side are successively moved to the space 6 side of the container 2 by the swirling flow when a gaseous sample 10 is introduced through an introducing path 11 from an introducing pipe 16. The liquid components fall as liquid drops and accumulate in the bottom 18 of the container 2.

Description

Detailed Description of the Invention

[0001]

This invention relates to the analysis of combustion exhaust gas.
The present invention mainly relates to a technique for preventing environmental pollution such as measurement, and particularly to a gas-liquid separation device used in a gas analysis / measurement device. The combustion exhaust gas generally contains a component such as water that condenses into a liquid at room temperature, and it is necessary to separate the liquid component when introducing the sample gas into the gas analyzer near room temperature. The present invention relates to an improvement in this type of gas-liquid separator.

[0002]

2. Description of the Prior Art Moisture is usually removed in the sampling system of automobile exhaust gas analyzers. As a method of removing this water, the sample line is introduced into the condenser container 40 as shown in FIG. 2, and the condenser container is cooled to near 0 ° C. with ice to condense the water in the sample gas and store it in the condenser container 40. , The method of trapping so that it will not drain into the sampling pump or the analyzer by draining it later, or introducing the sample gas into the condenser pipe meandering in the cooling water tank as shown in Fig. 3 to cool and connect it to the lower end of the condenser pipe. There is a method in which a trap is used so that it is stored in the condenser container 50 and then drained intermittently later. These methods require a trap with a volume capable of accommodating water that condenses within a certain time, and even if the water content which reaches 14% in a normal gas state is condensed, the exhaust gas is 1 m ³ (10 l / m 2).
The flow rate of in reaches 100 ml or more for 100 min). For this reason, the container that holds the condensed water is 50 to 100 ml as a container for the trap, depending on the flow rate of passage.
It took more than that.

[0003]

On the other hand, since the conventional gas analyzer has a response of about a second unit to the change of the gas concentration, the sample flow path system has a time delay corresponding to this. Has been accepted. However, recently, a gas analyzer with a high-speed response has been realized, and a response of 10 ms or less has become possible, and in response to this, the time delay of the sample flow path system also needs to be 100 ms or less. . For this reason, it is required to make the dead space in the flow path system as small as possible. In the conventional technology, the space for gas-liquid separation reaches more than 20 ml, and the space is 10 ml / m.
At a flow rate of about in, an average residence time of 120 ms or more was required, and it became impossible to respond to high-speed response.

In the sample flow path system of the gas analyzer,
When the response speed is important, it is desirable that the flow velocity is 30 m / s or more and the dead space is 1/30 or less of the total flow rate per second. In order to achieve such a goal
As a liquid separation device, the actual dead space is small,
Moreover, it is necessary for the flow path to have a shape in which there is little change in the cross-sectional area and the like and there is no retention. The present invention is thus intended to solve the problem of reducing the dead space and maintaining an appropriate flow velocity to minimize the mixing of the sample gas before and after.

[0005]

To solve this problem, a gas-liquid separator using a cyclone and a permeable membrane according to the present invention is provided with a spiral gas passage in a container, and an outer wall surface of the gas passage is permeable. It is composed of a membrane, a gaseous fluid containing condensed moisture is passed through the gas passage at a high speed, liquid components such as moisture are passed through the permeable membrane and separated from the gas passage into a container,
The feature is that the separated gaseous fluid is taken out.

[0006]

In the present invention, a swirl flow for separating condensed water and the like is applied while maintaining a high flow velocity to a certain extent so that the liquid droplets adhere to the outer peripheral side by the cyclone action, and the outer peripheral wall thereof is made to be permeable to liquid. It is made of a material having a liquid content, and the liquid component is permeated and contained in a container having a space. That is,
The sample gas of the combustion exhaust gas is cooled to a temperature required for reaching the inlet of the gas-liquid separation device, for example, near room temperature, and is contained as droplets or mist. When this sample gas passes through the gas passage groove spirally provided from the gas introduction pipe, it becomes a swirling flow, so that the liquid droplets or mist having a particle size of about 5 μ or more contained therein have a strong centrifugal force. Move toward the outer side of the swirl flow, that is, toward the permeable membrane. With such an action, the liquid component in the sample gas can be attached to the permeable membrane. In the permeable membrane, the liquid component gradually permeates from the side of the gas passage groove to the side of the space in the container, and becomes a droplet, which falls due to gravity or the like in the container. On the other hand, the gas component in the sample gas hardly passes through the permeable membrane because there is no pressure difference between the front and back sides of the permeable membrane. Thereby, the liquid component in the sample gas can be separated and stored in the bottom of the container.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIG.
In FIG. 1, 1 is a gas-liquid separation device. Gas-liquid separation device 1
Has a container 2 and a lid 3. The lid 3 is attached to the upper end of the container 2 with screws 4 sandwiching a seal ring 5, and forms a sealed space 6 in the container 2. Space 6
A gas passage member 7 having a substantially columnar shape or a cylindrical shape is arranged therein. The gas passage member 7 is attached to and supported by the lower surface of the lid 3. A gas passage groove 8 is spirally formed on the outer periphery of the gas passage member. The upper end of the gas passage groove 8 communicates with a gas introduction passage 11 formed in the lid 3, and the lower end of the gas passage groove 8 is formed in the center of the passage 21 and the gas passage member 7. It communicates with the gas lead-out path 12 formed in the lid body 3 via 13.

Outer open surface 14 of spiral gas passage groove 8
Is a permeable membrane 1 attached to the outer surface of the gas passage member 7.
Closed by 5. The permeable membrane 15 can be formed of a permeable membrane such as a filter paper. The gas introduction passage 11 formed in the lid 3 is connected to the gas introduction pipe 16, and the gas discharge passage 12 is connected to the gas discharge pipe 17. In the gas-liquid separation device thus configured, the operation of separating the liquid component contained in the sample gas is as follows.

A sample gas 10 is introduced from a gas introduction pipe 16 through a gas introduction passage 11, and a spiral gas passage groove 8 provided on the outer peripheral surface of a cylindrical gas passage member 7 arranged inside the container 2. Then, the gas is discharged from the central gas passage 13 via the gas outlet 12 and the gas outlet pipe 17. The wall surface on the outer peripheral side of the spiral gas passage groove 8 is formed of the permeable membrane 15, and the permeable membrane 1 on the outer peripheral side is formed by the swirling flow.
Liquid components adhering to the gas passage groove 8 side of the container 5
To the space 6 side, drops as droplets, and collects on the bottom 18 of the container 2.

As the sample gas passage, the spiral gas passage groove 8 inside the permeable membrane 15, the gas passage 13 at the center of the cylindrical gas passage member 7, and the passage 21 communicating therewith.
The dead space thereof can be reduced to, for example, 1 ml or less.

[0011]

The sample gas of the combustion exhaust gas is cooled to a temperature required to reach the inlet of the gas-liquid separation device, for example, near room temperature, and is contained as droplets or mist. When this sample gas passes from the gas introduction pipe 16 through the gas passage groove 8 spirally provided, it becomes a swirling flow,
Droplets or mist having a particle size of approximately 5 μ or more contained therein move toward the outer side of the swirling flow, that is, toward the permeable membrane due to the action of a strong centrifugal force. With such an action, the liquid component in the sample gas can be attached to the permeable membrane. In the permeable membrane, the liquid component gradually permeates from the gas passage groove 8 side to the space 6 side in the container, and becomes a droplet, which falls due to gravity or the like in the container.

On the other hand, the gas component in the sample gas hardly passes through the permeable membrane because there is no pressure difference between the front and back of the permeable membrane. Thereby, the liquid component in the sample gas can be separated and stored in the bottom portion 18 in the container 2. in this case,
The space through which the sample gas passes has a spiral gas passage groove 8
And the passage 21 and the gas passage 13 before and after they are connected to each other, and their volumes can be made small, and the time for passing therethrough can be made small.

As described above, according to this apparatus, the liquid component contained in the sample gas can be separated from the gas phase with a very small dead space as the gas flow path and a high flow velocity. As a sampling channel system, a device that can separate gas and liquid with an extremely small delay time can be configured.

[Brief description of drawings]

FIG. 1 is a cross-sectional explanatory view of a gas-liquid separator using a cyclone and a permeable membrane according to an embodiment of the present invention.

FIG. 2 is a structural explanatory view showing a conventional gas-liquid separation device.

FIG. 3 is a structural explanatory view showing a conventional gas-liquid separation device.

[Simple explanation of symbols]

 1 Gas-Liquid Separator 2 Container 3 Lid 4 Screw 5 Seal Ring 6 Space 7 Gas Passage Member 8 Gas Passage Groove 10 Sample Gas 11 Gas Introducing Path 12 Gas Outflowing Path 13 Gas Passage 14 Outer Opening Surface 15 Outer Membrane 16 Gas Introducing Pipe 17 Gas Outlet Pipe 18 Bottom 21 Passage 40 Condenser Container 50 Condenser Container

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI Technical display location G01N 1/22 P 7519-2J K 7519-2J

Claims (2)

[Claims] 1. A spiral gas passage is provided in a container, an outer wall surface of the gas passage is formed of a permeable membrane, and a gaseous fluid containing condensed moisture is passed through the gas passage at a high speed to obtain a water content. A gas-liquid separation device using a cyclone and a permeable membrane, wherein a liquid component such as is passed through the permeable membrane to be separated from the gas passage into the container, and the separated gaseous fluid is taken out. 2. A spiral groove-shaped gas passage communicating from a gas inlet conduit is provided on a cylindrical outer peripheral surface placed in a container, and the outside thereof is covered with a cylindrical film capable of permeating a liquid component, condensed water, etc. A gaseous fluid containing water is passed through the spiral groove-shaped gas passage at high speed, liquid components such as water are passed through the permeable membrane and separated from the gas passage into the container. The gas-liquid separator using a cyclone and a permeable membrane according to claim 1, wherein the gas is sucked through a gas outlet via a gas passage of the part.