KR101145860B1

KR101145860B1 - Wet Gaseous Sample Collector

Info

Publication number: KR101145860B1
Application number: KR1020100024739A
Authority: KR
Inventors: 신재신; 한상용
Original assignee: 한국수력원자력 주식회사
Priority date: 2010-03-19
Filing date: 2010-03-19
Publication date: 2012-05-17
Also published as: KR20110105543A

Abstract

It is an object of the present invention to provide a wet gas sample collector capable of effectively collecting gas samples present at very low concentrations in air.
The wet gas sample collector of the present invention for realizing the object as described above is a bubbler which is connected to an air inlet and an air outlet, and contains a collecting solution for collecting the gas sample contained in the air introduced into the air inlet. And, it is characterized in that it comprises a moisture separator for recovering the moisture of the collecting solution contained in the air passing through the collecting solution and discharge only the air in the gaseous state.
According to the present invention, it is possible to effectively collect gas samples present at very low concentrations in the air in a short time by increasing the flow rate of air and minimizing the evaporation and moisture discharge of the collecting solution.

Description

Wet Gaseous Sample Collector

The present invention relates to a wet gas sample collector, and more particularly, to a wet gas sample collector for capturing gaseous substances in an air at an extremely low concentration to an analytical level.

A bubbler (bubbler or gas washing bottle) is used as a device for collecting samples such as tritium and C-14 contained in the air. The bubbler is a device that blows air into the collecting solution so that the material to be collected is dissolved in the collecting solution while the bubbles pass through the collecting solution.

The collection solution is selected according to the material to be collected. Pure water or ethylene glycol is used to capture tritium in the form of steam, and sodium hydroxide (NaOH) solution is used to capture carbon dioxide (CO ₂ ).

Pure water can also be used to capture heavy water contained in the air.

Usually, the concentration of heavy water in the air is very low, so it is not easy to increase the concentration of heavy water dissolved in the collection solution to an easy level for analysis.

Therefore, if the concentration of the substance to be contained in the air is low, a large amount of air must pass through the bubbler. In this case, however, the collection time becomes long and the collection solution evaporates. The amount of evaporation of the collection solution is proportional to the product of the saturated vapor partial pressure of the solution and the volume of air passing through the solution.

In addition, if the flow rate of air is increased in order to shorten the collection time, there is a problem that the moisture of the collecting solution may be discharged accompanying the air.

The present invention has been made to solve the above problems, an object of the present invention is to provide a wet gas sample collector that can effectively collect the gas sample present in a very low concentration in the air.

The wet gas sample collector of the present invention for realizing the object as described above is connected to an air inlet and an air outlet, and a bubbler containing a collecting solution for collecting gas samples contained in the air introduced into the air inlet. And, it is characterized in that it comprises a moisture separator for recovering the moisture of the collecting solution contained in the air passing through the collecting solution and discharge only the air in the gaseous state.

It may further comprise a pressure control unit consisting of a compressor for compressing the air flowing into the air inlet, and a pressure control valve for adjusting the flow rate of the air discharged to the air outlet.

The pressure control unit may further include a flow meter and a pressure gauge for measuring the flow rate and pressure of the air passing through the bubbler.

It may be configured to further include a cooling unit for cooling the collection solution contained in the bubbler.

The cooling unit may be configured to include a cooling coil surrounding the outer circumference of the bubbler.

The cooling unit may be a cooling coil is inserted into the inside of the bubbler, the outer surface of the bubbler may be a heat insulating treatment.

An upper side of the bubbler may be configured to further include a heat exchanger for performing heat exchange between the air flowing through the air inlet and the air cooled by the cooling unit and discharged to the air outlet.

The moisture separator is an exhaust pipe consisting of an air inlet portion having an open bottom portion and having a wide cross section and an air discharge portion having a narrow cross section extending upwardly and communicating with the air outlet port, and an outer side of the air inlet portion of the exhaust pipe. It may be configured to include a downfall pipe consisting of a mixed gas inlet portion spaced apart from the circumference and a downflow portion extending downward.

The bubbler may be configured to be provided with a stopper for maintaining the airtight inside the bubbler.

According to the wet gas sample collector according to the present invention, it is possible to effectively collect the gas sample present at a very low concentration in the air within a short time by increasing the flow rate of air and minimizing the evaporation of the collecting solution and the discharge of moisture. have.

1 is a block diagram of a wet gas sample collector according to the present invention,
2 is an enlarged view of a bubbler constituting the wet gas sample collector according to the present invention;
Figure 3 is an enlarged view of the moisture separation unit provided in the bubbler of the wet gas sample collector according to the present invention.

Hereinafter, the configuration and operation of the preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a configuration diagram of a wet gas sample collector according to the present invention, Figure 2 is an enlarged view of a bubbler constituting the wet gas sample collector according to the present invention, Figure 3 is a bubbler inside the wet gas sample collector according to the present invention An enlarged view of the moisture separator provided in the.

The wet gas sample collector according to the present invention is connected to the air inlet 11 and the air outlet 12, the trapping solution (L) for trapping the gas sample contained in the air introduced into the air inlet 11 is accommodated The bubbler 10, a pressure control unit 20 for pressurizing air in the bubbler 10, a cooling unit 30 and a bubble for cooling the collection solution contained in the bubbler 10. And a heat exchanger 40 provided at an upper side of the plunger 10 to exchange heat between the air introduced through the air inlet 11 and the air cooled by the cooling unit 30 and discharged to the air outlet 12. It is composed.

An air inlet pipe 11a is connected to the air inlet 11, and the air inlet pipe 11a has a lower level at a predetermined water level inside the bubbler 10 via an internal space of the heat exchanger 40. It is located in the received collection solution (L).

The air introduced through the air inlet pipe 11a is subjected to molecular exchange while bubbles are passing through the collecting solution, so that the sample material is collected in the collecting solution, and the air raised above the surface of the collecting solution is discharged through the air discharge pipe 12a. do.

The bubbler 10 is made of a solid material to withstand high pressure, and as shown in FIG. 2, a stopper 45 that opens and closes the upper portion of the bubbler 10 is screwed so as not to open itself by pressure. It may be configured to rotate by opening or closing a separate release preventing device (not shown) is installed.

The stopper 45 is inserted through the air inlet pipe 11a and the exhaust pipe 51.

The pressure control unit 20 is to reduce the volume of air passing through the collection solution to reduce the amount of evaporation of the collection solution, the compressor 22 is installed on the flow path of the air inlet pipe (11a) and the air discharge pipe (12a) And a pressure gauge (23) for measuring the pressure control valve (24) installed on the flow path of the air), and the air inlet pipe (11a) or the air discharge pipe (12a) for measuring the flow rate of air. The flowmeter 21 is installed.

By restricting the flow of air by adjusting the pressure regulating valve 24 while blowing air into the bubbler 10 using the compressor 22, the pressure inside the bubbler 10 may be increased.

The compressor 22 preferably uses a large capacity in order to allow a large amount of air to pass through the collecting solution in a short time. For example, when the air of 5 m 3 or more is to be passed within 8 hours, a flow rate of 10 lpm or more is 1. A compressor that can compress above atmospheric pressure (gauge pressure) would be suitable.

The cooling unit 30 is for reducing the evaporation amount of the collection solution by lowering the saturated air partial pressure, and cooling the collection solution near the freezing point. The cooling unit 30 is configured in such a way that the cooling coil 32 surrounds the outer circumference of the bubbler 10 as shown in FIG. 1, or although not shown, the cooling coil 32 inside the bubbler 10. ) And the outer surface of the bubbler 10 may be insulated.

The heat exchanger 40 is to lower the temperature of the air introduced into the bubbler 10 by utilizing the low temperature air discharged from the bubbler 10, and the heat transfer area is in the internal space of the heat exchanger 40. In order to increase the flow path of the air inlet pipe (11a) is arranged in the S-shape, the outer surface of the air inlet pipe (11a) is in contact with the low-temperature air discharged through the exhaust pipe (51).

On the other hand, in the present invention, when the flow rate of air is large, the moisture separator 50 is provided on the inner upper portion of the bubbler 10 to prevent the moisture generated when the bubbles of the collecting solution burst with the air. The moisture separator 50 recovers the moisture of the collecting solution contained in the air passing through the collecting solution and discharges only the gaseous air to the heat exchange part 40 through the exhaust pipe 51.

Referring to FIG. 3, the moisture separator 50 has an air inlet 51a and a diameter D1 having a wide open cross section and a narrow cross section extending upwardly and communicating with the heat exchanger 40. The exhaust pipe 51b is formed of an air discharge part 51b and a diameter D2, and the upper part of the exhaust pipe 51 is opened and spaced apart from the outer circumference of the air inlet part 51a of the exhaust pipe 51. It consists of a mixed gas inlet 52a (diameter D3) and a downfall portion 52b, a diameter D4 extending to the lower side thereof, and comprises a downcomer pipe 52 in which the moisture of the collecting solution is recovered downward.

According to this configuration, the air containing the moisture that passes through the collecting solution and moves upward from the inside of the bubbler 10, the upper flow path is converted downward from the upper side of the mixed gas inlet 52a, so that the mixed gas inlet ( It passes through space A between 52a) and the air inlet 51a, and moves to space B.

The air moved to the space B is again converted to an upward flow path to move to the space C inside the air inlet 51a. At this time, the moisture of the collecting solution contained in the air cannot be changed in direction and the lower slope 52c is provided. When it hits, it flows downward through the area | region D inside the dripping pipe 52b, and is collect | recovered with a collection solution.

In addition, since the flow path cross section of the space C is wider than the flow path cross section of the space A, the flow velocity of air passing through the space C is reduced. This causes the moisture in the air to sink down.

In this process, the moisture separated from the moisture separator 50 is recovered as a collecting solution, and only the air in the gas state from which the moisture is removed is moved upward and discharged to the heat exchange unit 40 through the air discharge unit 51b. do.

As described above, the wet gas sample collector according to the present invention is a pressure control unit 20 for suppressing evaporation of a collection solution caused when the flow rate of air is increased in order to collect gas samples existing at very low concentrations in the air. ) And a cooling unit 30 and a moisture separation unit 50 for preventing the moisture of the collecting solution from being discharged with the air can be effectively collected in a short time.

It will be apparent to those skilled in the art that the present invention is not limited to the above embodiments and can be practiced in various ways without departing from the technical scope of the present invention. will be.

10: bubbler 11: air inlet
11a: air inlet pipe 12: air outlet
12a: air discharge pipe 20: pressure control unit
21: flow meter 22: compressor
23: pressure gauge 24: pressure control valve
30 cooling unit 32 cooling coil
40: heat exchanger 45: stopper
50: moisture separation unit 51: exhaust pipe
51a: air inlet 51b: air outlet
52: downfall pipe 52a: mixed gas inlet
52b: falling part 52c: inclined surface
B: Bubble L: Collection Solution

Claims

A bubbler which communicates with an air inlet and an air outlet, and accommodates a collecting solution for collecting gas samples contained in the air introduced into the air inlet;
It includes a moisture separator for recovering the moisture of the collecting solution contained in the air passing through the collecting solution and discharge only the air in the gaseous state,
The moisture separator,
An exhaust pipe having an air inlet portion having an open lower portion and having a wide cross section, and an air discharge portion having a narrow cross section extending upwardly and communicating with the air outlet port;
The wet gas sample collector of claim 1, further comprising a downfall pipe formed of a mixed gas inlet part which is spaced apart from the outer circumference of the air inlet part of the exhaust pipe and a downfall part extending downward.

The method of claim 1,
And a pressure regulating unit comprising a compressor for compressing air introduced into the air inlet, and a pressure control valve for adjusting a flow rate of air discharged to the air outlet.

The method of claim 2,
The pressure regulator is a wet gas sample collector, characterized in that further comprises a flow meter and a pressure gauge for measuring the flow rate and pressure of the air passing through the bubbler.

4. The method according to any one of claims 1 to 3,
Wet gas sample collector, characterized in that it further comprises a cooling unit for cooling the collection solution contained in the bubbler.

The method of claim 4, wherein
And the cooling unit comprises a cooling coil surrounding the outer circumference of the bubbler.

The method of claim 4, wherein
The cooling unit is a wet gas sample collector, characterized in that the cooling coil is inserted into the inside of the bubbler, the outer surface of the bubbler is insulated.

The method of claim 4, wherein
Wet gas sample collector, characterized in that the heat exchanger further comprises a heat exchange between the air flowing through the air inlet through the air inlet and the air cooled by the cooling unit discharged to the air outlet.

delete

The method of claim 1,
The bubbler is a wet gas sample collector, characterized in that the stopper is installed for maintaining the airtight inside the bubbler.