CN211553916U

CN211553916U - Water-soluble gas detection device based on dynamic headspace method

Info

Publication number: CN211553916U
Application number: CN201922238670.8U
Authority: CN
Inventors: 刘佳; 肖尚斌; 刘流; 郑祥旺; 汉斯-彼得·格罗萨特; 安德里亚斯·洛尔克
Original assignee: China Three Gorges University CTGU
Current assignee: China Three Gorges University CTGU
Priority date: 2019-12-13
Filing date: 2019-12-13
Publication date: 2020-09-22
Anticipated expiration: 2029-12-13

Abstract

The utility model provides a water-soluble gas detection device based on developments headspace method, including water-gas mixing system and water-gas separation system, water-gas mixing system includes the mixing chamber, and the mixing chamber is connected with inlet tube and hybrid tube, and the nitrogen cylinder passes through the intake pipe to be connected with the mixing chamber, is equipped with the aeration equipment with intake-tube connection in the mixing chamber, is equipped with first delivery pump on the inlet tube, and water-gas separation system includes the separation chamber, and mixing tube and blast pipe are connected to the separation chamber top, and separation chamber bottom connecting drain pipe is equipped with the second delivery pump on the drain pipe, and the blast pipe is connected with the gas detection appearance. The device can detect the water-soluble gas in the water sample, and has the advantages of simple structure and easy operation.

Description

Water-soluble gas detection device based on dynamic headspace method

Technical Field

The utility model belongs to dissolved gas concentration analysis device, in particular to water-soluble gas detection device based on dynamic headspace method.

Background

Along with the development of society and the progress of technology, the capability of human beings for improving nature is stronger and more serious, and the damage to the environment is more and more serious. Since people burn fossil fuels such as petroleum, etc., or fell down a forest and burn it, they generate a large amount of carbon dioxide, i.e., these greenhouse gases are highly permeable to visible light from solar radiation and highly absorbent to infrared rays emitted from the earth, which strongly absorb ground radiation, resulting in an increase in the temperature of the earth. Global warming can redistribute global precipitation, glaciers, etc., not only jeopardizing natural balance, but also threatening human survival.

Further research shows that methane and nitrous oxide have strong warming effect except carbon dioxide. Hydroelectric power generation is considered to be clean energy with no pollution and zero emission, but recent research shows that the construction of a reservoir can cause the formation of a slow-flow water body, so that the reservoir emits more greenhouse gases such as carbon dioxide, methane, nitrous oxide and the like. Although the prior art can conveniently measure the concentrations of carbon dioxide, methane and nitrous oxide in the air, how to efficiently detect the concentrations of carbon dioxide, methane and nitrous oxide dissolved in a water body is still a difficult problem.

The headspace technique is widely applied to analysis of volatile organic compounds in various types of samples, and compared with other sample introduction techniques, headspace sample introduction can not only complete sample preparation, but also effectively avoid the problem of sample cross contamination.

Dynamic headspace is also known as purge-trapping analysis, in which a liquid sample is purged with an inert gas to purge the component to be analyzed.

Disclosure of Invention

The utility model aims to solve the technical problem that a water-soluble gas detection device based on dynamic headspace method is provided, can detect the water-soluble gas in the water sample, simple structure, easy to operate.

In order to solve the technical problem, the utility model discloses the technical scheme who adopts is: the water-soluble gas detection device based on the dynamic headspace method comprises a water-gas mixing system and a water-gas separation system, wherein the water-gas mixing system comprises a mixing chamber, the mixing chamber is connected with a water inlet pipe and a mixing pipe, a nitrogen cylinder is connected with the mixing chamber through an air inlet pipe, an aeration device connected with an air inlet pipe is arranged in the mixing chamber, a first conveying pump is arranged on the water inlet pipe, the water-gas separation system comprises a separation chamber, the top of the separation chamber is connected with the mixing pipe and an exhaust pipe, the bottom of the separation chamber is connected with a drain pipe, a second conveying pump is arranged on the drain pipe, and the exhaust pipe is connected with a gas detector.

In a preferable scheme, the air inlet pipe is provided with a pressure regulating valve.

In a preferable scheme, a gas flow controller is arranged on the gas inlet pipe.

In a preferred scheme, the device further comprises a bracket, and the mixing pipe is spirally wound on the bracket.

In a preferred scheme, the aeration device is an aeration stone.

The utility model provides a pair of water-soluble gas detection device based on dynamic headspace method, simple structure, the dependable performance makes conveniently and not fragile to with low costs, the site operation is simple and convenient, can carry out quick, continuous field monitoring, and it detects the water-soluble gas in the water sample through the principle of dynamic headspace method, and easy operation has optimized the error that traditional headspace balance method shifts many times and brings.

Drawings

The invention will be further explained with reference to the following figures and examples:

fig. 1 is a schematic structural view of the present invention;

in the figure: mixing chamber 1, water inlet pipe 2, mixing pipe 3, air inlet pipe 4, aeration device 5, first delivery pump 6, separation chamber 7, exhaust pipe 8, water outlet pipe 9, second delivery pump 10, gas detector 11, pressure regulating valve 12, support 13, gas flow controller 14 and nitrogen gas cylinder 15.

Detailed Description

Example 1: as shown in fig. 1, a water-soluble gas detecting device based on a dynamic headspace method comprises a water-gas mixing system and a water-gas separating system, wherein the water-gas mixing system comprises a mixing chamber 1, the mixing chamber 1 is a transparent plastic container with a volume of 3ml, and can conveniently observe the working state in the mixing chamber 1, the mixing chamber 1 is connected with a water inlet pipe 2 and a mixing pipe 3, the water inlet pipe 2 conveys a water sample, a nitrogen cylinder 15 is connected with the mixing chamber 1 through an air inlet pipe 4, an aeration device 5 connected with the air inlet pipe 4 is arranged in the mixing chamber 1, in the embodiment, the aeration device 5 is an aeration stone, the aeration device 5 can also be replaced by an aeration pipe laid in the mixing chamber 1 and an aeration nozzle arranged on the aeration pipe, the water inlet pipe 2 is provided with a first delivery pump 6, the first delivery pump 6 is a peristaltic pump, the flow rate of the first delivery pump 6 is set to be 500ml/min, the water-gas separation system comprises a separation chamber 7, the top of the separation chamber 7 is connected with a mixing pipe 3 and an exhaust pipe 8, the bottom of the separation chamber 7 is connected with a water discharge pipe 9, a second delivery pump 10 is arranged on the water discharge pipe 9, and the exhaust pipe 8 is connected with a gas detector 11, wherein in the embodiment, the gas detector 11 is Picaro 2301.

When the device is used specifically, the first delivery pump 6 is opened, the flow of the first delivery pump 6 is 500ml/min, a water sample is delivered into the mixing chamber 1, meanwhile, a valve on the nitrogen cylinder 15 is opened, the gas flow is set to be 1L/min, nitrogen is filled into the mixing chamber 1 to be mixed with the water sample, after aeration is carried out by the aeration device 5, the nitrogen is fully mixed and exchanged with the water sample, and the dynamic balance between the gas to be detected in the water sample and the headspace is achieved; mixing the water sample in the mixing chamber 1, discharging the mixed water sample into a separation chamber 7 through a mixing pipe 3, starting a second conveying pump 10, wherein the flow rate of the second conveying pump 10 is 500ml/min, separating the water sample from water-soluble gases (such as carbon dioxide, methane, nitrous oxide and the like), introducing the separated gases into a gas detector 11 through an exhaust pipe 8 for detection, and discharging the separated water sample through a drain pipe 9.

Preferably, the air inlet pipe 4 is provided with a pressure regulating valve 12. The inlet pressure of the inlet pipe 4 is adjusted by the pressure adjusting valve 12, in this embodiment, the inlet pressure of the inlet pipe 4 is adjusted to 2bar, so that the inlet flow is stable, and the flow control of the gas flowmeter is facilitated.

Preferably, the gas inlet pipe 4 is provided with a gas flow controller 14. In this embodiment, the gas flow controller 14 is of the SLD-MFC type, and the gas flow controller 14 can accurately control the gas inlet speed of the gas inlet pipe 4 to ensure the sufficient mixing of the nitrogen gas and the water sample.

Preferably, the mixing device further comprises a bracket 13, wherein the bracket 13 is of a cylindrical structure and is made of polyethylene material, and the mixing pipe 3 is spirally wound on the bracket 13. Mixing tube 3 is transparent polyethylene material hose, and length is two meters, through with mixing tube 3 winding on support 13, realizes the fixed of mixing tube 3, can guarantee the intensive mixing of water sample and gas through extension mixing tube 3, in the use, need observe mixing tube 3 interior rivers state, prevent to take place trouble such as jam.

Claims

1. The utility model provides a water-soluble gas detection device based on dynamic headspace method which characterized in that: including water-gas mixing system and water-gas piece-rate system, water-gas mixing system includes mixing chamber (1), mixing chamber (1) is connected with inlet tube (2) and hybrid tube (3), nitrogen cylinder (15) are connected with mixing chamber (1) through intake pipe (4), be equipped with aeration equipment (5) of being connected with intake pipe (4) in mixing chamber (1), be equipped with first delivery pump (6) on inlet tube (2), water-gas piece-rate system includes separating chamber (7), hybrid tube (3) and blast pipe (8) are connected at separating chamber (7) top, drain pipe (9) is connected to separating chamber (7) bottom, be equipped with second delivery pump (10) on drain pipe (9), blast pipe (8) are connected with gas detection appearance (11).

2. The water-soluble gas detection device based on the dynamic headspace method according to claim 1, wherein: the air inlet pipe (4) is provided with a pressure regulating valve (12).

3. The water-soluble gas detection device based on the dynamic headspace method according to claim 1, wherein: the mixing tube is characterized by further comprising a support (13), and the mixing tube (3) is wound on the support (13) in a spiral shape.

4. The water-soluble gas detection device based on the dynamic headspace method according to claim 1, wherein: the aeration device (5) is an aeration stone.

5. The water-soluble gas detection device based on the dynamic headspace method according to claim 1, wherein: and a gas flow controller (14) is arranged on the gas inlet pipe (4).