CN115015503A - Ocean radon in-situ measurement device and measurement method - Google Patents

Abstract

The invention discloses an ocean radon in-situ measuring device and a measuring method, which relate to the technical field of seawater measuring equipment and comprise a degassing component and a measuring component which are positioned in an underwater connection cabin, wherein the degassing component comprises a drying part and a measuring part, the drying part is used for separating gas in seawater, the measuring component comprises a drying part and a measuring part, the drying part is used for removing moisture in the gas, the measuring part is used for carrying out in-situ measurement on radon, and an exhaust port of the degassing component, the drying part and the measuring part are sequentially communicated along the flowing direction of the gas; the testing device provided by the invention does not need additional human intervention when running underwater, can automatically and quickly and accurately measure the radon content in the water body, and is also provided with the drying part, so that the influence of the moisture content in the radon gas on the measuring part can be reduced, the measuring precision is improved, and the service life of the measuring part can be prolonged by reducing the environmental humidity of elements inside the measuring part.

Description

A kind of marine radon in-situ measurement device and measurement method

technical field

The invention relates to the technical field of seawater measurement equipment, in particular to a marine radon in-situ measurement device and a measurement method.

Background technique

Marine radon isotope tracer technology is an ideal means to study oceanic processes from a chemical point of view, and natural radon isotope is a classic tracer for studying oceanic dynamical processes. Due to the extremely low concentration of radon gas in ocean water (0.05dpm/L～3dpm/L), the sampling of radon gas requires large-volume water collection and enrichment, and the backwardness of large-volume sampling and analysis and measurement technology of seawater has always restricted relevant research. progress. At present, the measurement of radon isotopes in seawater is mainly limited to the laboratory, and the navigation measurement technology is only in its infancy, and underwater in-situ measurement has not yet been achieved. Therefore, how to provide an in-situ measurement system for seawater radon concentration to realize underwater in-situ measurement of seawater radon isotopes is a technical problem solved by the current technology.

The invention patent with the application number of "202111524513.9" and the title of "Seawater Radon Concentration In-Situ Measurement System" discloses a technical solution capable of in-situ measurement of seawater radon concentration, which includes a degassing device and a measuring device; a degassing device It includes a degassing chamber for degassing seawater, and an outlet pipe and a gas return pipe connected to the degassing chamber; the measuring device includes a sealed cabin, a gas monitoring cabin and a radon probe sealed cabin arranged in the sealed cabin; The cabin has an air inlet and an air outlet, the air inlet is connected with the air outlet pipe of the degassing device, the air outlet is connected with the return air pipe of the degassing device, and the air inlet and the air outlet are respectively provided with control valves; the gas monitoring cabin An air pump is arranged inside, and the air inlet end of the air pump is connected to the air inlet through an air circuit; a radon probe is arranged in the sealed cabin of the radon probe, and the air inlet end of the radon probe is connected to the air outlet end of the air pump through an air circuit, and the air outlet end of the radon probe is installed. It is connected to the air outlet through a gas circuit, so that underwater in-situ measurement of radon isotopes in seawater can be realized.

However, traditional radon probes need to control the relative humidity of the gas to be lower than 10% during use, and the use conditions are relatively harsh. Directly passing the gas separated by the degassing device into the radon probe will not only affect the measurement accuracy of the radon probe, but also The internal components of the radon probe will be exposed to a high humidity environment for a long time, which will affect its service life.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a marine radon in-situ measurement device and measurement method, so as to solve the problems existing in the prior art, not only can reduce the influence of the moisture content in the radon gas on the measurement part, improve the measurement accuracy, but also reduce the The humidity of the environment where the components inside the measuring part are located, prolonging the service life of the measuring part.

In order to achieve the above object, the present invention provides the following solutions: the present invention provides a marine radon in-situ measurement device, comprising a degassing assembly and a measuring assembly located in the underwater connection cabin, and the degassing assembly includes a device for degassing seawater. The gas in the gas is separated, and the measuring assembly includes a drying part and a measuring part, the drying part is used for removing moisture in the gas, and the measuring part is used for in-situ measurement of radon, along the flow direction of the gas, the The exhaust port of the degassing assembly, the drying part, and the measuring part are communicated in sequence.

Preferably, the drying part includes a Nafion drying tube and a drying column containing a desiccant which are connected in sequence along the gas flow direction, the Nafion drying tube includes an inner tube and an outer tube that are sleeved together, and the two ends of the outer tube are respectively connected to The exhaust port of the degassing assembly is communicated with the drying column, and the inner pipe is communicated with the measuring part and the air inlet of the degassing assembly, respectively.

Preferably, a gas filter is further arranged between the drying column and the measuring part, and the gas filter is used for filtering particulate impurities and decay daughters of radon in the gas.

Preferably, the detection part includes a PIC radon probe for measuring radon concentration and a temperature, humidity and pressure sensor for measuring gas temperature, humidity and pressure.

Preferably, the measurement assembly further comprises a diaphragm air pump for powering the gas flow, and the diaphragm air pump is located at the inlet of the measurement part.

Preferably, the degassing assembly comprises a liquid filter, a diaphragm pump, a degassing pipe and a liquid one-way valve sequentially connected along the liquid flow direction; the air inlet and the exhaust port of the degassing pipe are respectively Air intake and exhaust ports of components.

Preferably, a gas check valve is further arranged between the inner pipe and the air inlet of the degassing component.

Preferably, the connecting cabin includes a measuring cabin and a degassing cabin, the measuring assembly and the degassing assembly are respectively arranged in the measuring cabin and the degassing cabin, and the measuring assembly further includes a A water leakage detector for detecting the water leakage condition of the measurement chamber.

Preferably, the measurement device further includes an information acquisition control system disposed on the water, and the information acquisition control system is electrically connected to the degassing component and the measurement component.

The present invention also provides a measurement method of the marine radon in-situ measurement device, comprising the following steps:

1) Use the diaphragm pump to send the seawater into the degassing pipe, and use the degassing pipe to separate the gas;

2) The separated gas enters the drying column through the outer tube of the Nafion drying tube for drying, and then passes into the PIC radon probe for measurement;

3) The measured gas enters the degassing pipe through the inner pipe of the Nafion drying pipe and the gas one-way valve in turn and dissolves into the seawater, and finally is discharged through the liquid one-way valve.

The present invention has achieved the following technical effects with respect to the prior art:

1. The test device in the present invention does not require additional human intervention when running underwater, can automatically measure the radon content in the water body quickly and accurately, and is also provided with a drying section in the present invention, which can not only reduce the moisture in the radon gas The influence of the content on the measurement part can improve the measurement accuracy, and can also prolong the service life of the measurement part by reducing the environmental humidity of the internal components of the measurement part;

2. The present invention uses a combination of Nafion drying tube and drying column to dry the separated gas. Due to the large humidity difference between the inner tube and the outer tube of the Nafion drying tube, a new round of high-humidity gas to be tested The water molecules in the desiccant will enter the inner tube from the outer tube by passive diffusion, so that the humidity of the gas entering the drying column will be reduced in advance, which will help prolong the service life of the desiccant in the drying column, and also improve the drying effect.

Description of drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings required in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some of the present invention. In the embodiments, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without creative labor.

Fig. 1 is the overall structure schematic diagram of the present invention summarizing the marine radon in-situ measurement device;

Among them, 1. Information acquisition control system; 11. Shore-based electronic control module; 2. Degassing components; 21. Liquid filter; 22. Diaphragm pump; 23. Degassing pipe; 24. Liquid check valve; 3. Measurement Components; 31, Nafion drying tube; 32, drying column; 33, gas filter; 34, PIC radon probe; 35, temperature, humidity and pressure sensor; 36, water leak detector; 37, gas check valve; 38, diaphragm pump 4. Underwater electronic control module.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

The purpose of the present invention is to provide a marine radon in-situ measurement device and measurement method, so as to solve the problems existing in the prior art, not only can reduce the influence of the moisture content in the radon gas on the measurement part, improve the measurement accuracy, but also reduce the The humidity of the environment where the components inside the measuring part are located, prolonging the service life of the measuring part.

In order to make the above objects, features and advantages of the present invention more clearly understood, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

This embodiment provides an in-situ measurement device for marine radon, which includes a degassing assembly 2 and a measuring assembly 3 located in an underwater connection cabin. The degassing assembly 2 includes a device for separating gas in seawater, and the measuring assembly 3 includes The drying part and the measuring part, the drying part is used to remove the moisture in the gas, and the measuring part is used to measure the radon in situ.

When in use, the connection cabin is placed in the ocean, the seawater enters the degassing component 2 for degassing, the separated gas enters the drying part in the measuring component 3 for drying, removes the moisture in the gas, and then the dry gas enters the measuring part, The measuring part measures the radon gas, and finally can convert the radon concentration in the air into the radon content in the water body through the gas-liquid distribution coefficient; thus the test device in this embodiment does not require additional human intervention when running underwater, and can The rapid and accurate measurement of the radon content in the water body is carried out automatically, and a drying part is also provided in this embodiment, which can not only reduce the influence of the moisture content in the radon gas on the measurement part, improve the measurement accuracy, but also reduce the internal components of the measurement part. The humidity of the environment where it is located can prolong the service life of the measuring part.

Specifically, in this embodiment, the degassing assembly 2 includes a liquid filter 21, a diaphragm pump 22, a degassing pipe 23 and a liquid one-way valve 24 connected in sequence along the liquid flow direction; the measurement assembly 3 includes Nafion disposed in sequence along the gas flow direction The drying pipe 31, the drying column 32 containing the desiccant, the gas filter 33, the diaphragm air pump 38, and the radon measuring chamber, wherein the Nafion drying pipe 31 comprises an inner pipe and an outer pipe that are sleeved together, and the two ends of the outer pipe are respectively It is communicated with the exhaust port of the degassing pipe 23 and the drying column 32, and the inner pipe is communicated with the measuring part in the radon measuring chamber and the air inlet of the degassing pipe 23; specifically, the measuring part includes a PIC radon measuring instrument and a temperature, humidity and pressure sensor. 35.

In the specific working process, the diaphragm pump 22 pumps water, and the water first passes through the liquid filter 21 (a stainless steel filter with a precision of 40 μm can be used) to filter out the biological debris, sediment, sediment and other large particles mixed in the seawater. To ensure that the degassing component 2 has a good working environment, to avoid damage to the service life and degassing efficiency, the filtered water flow passes through the degassing pipe 23 at a constant speed of 2L/min, and the dissolved gas in the seawater is separated after passing through the degassing pipe 23. Out, under the action of the diaphragm air pump 38, at a flow rate of 1 L/min, it first passes through the outer tube of the Nafion drying tube 31, and then passes through the drying column 32 filled with 8-mesh CaSO ₄ -CoCl ₂ type desiccant to further remove moisture and dry it. The latter gas passes through a nylon gas filter 33 with a pore size of 0.45 μm to remove particulate impurities and radon decay daughters (Po ⁺ , Pb ⁺ ions), and then enters the radon measuring chamber, where the radon concentration is measured by a PIC radon measuring instrument, and the temperature is used to measure the radon concentration. The wet pressure sensor 35 measures the temperature, humidity and pressure of the radon gas, then the gas enters the inner pipe of the Nafion drying pipe 31 , the gas one-way valve 37 returns to the degassing pipe 23 and re-dissolves into the seawater, and is discharged through the liquid one-way valve 24 .

Since there is a large humidity difference between the inner and outer tubes of the Nafion drying tube 31, the water molecules in the high-humidity gas to be measured in a new round will enter the inner tube from the outer tube by passive diffusion, so that they enter the drying column 32 The humidity of the gas is reduced in advance, which will help to prolong the service life of the desiccant in the drying column 32, and can also improve the drying effect.

Although the drying part has been set up in this embodiment, the PIC radon detector is still used. The detection efficiency of the radon probe in the PIC radon detector is about twice that of the RAD7 radon probe, and its detection sensitivity is hardly affected by the gas humidity. Has high measurement accuracy.

Existing degassing elements can be selected for the degassing pipe 23, and the specific structure and principle are not described in detail in this embodiment.

The connecting cabin includes a measuring cabin and a degassing cabin, the measuring assembly 3 and the degassing assembly are respectively arranged in the measuring cabin and the degassing cabin, and the measuring assembly 3 also includes a water leakage detector 36 for detecting the water leakage condition of the measuring cabin; The water leakage detector 36 is composed of a leakage detection sensor, a single-chip microcomputer, and a solenoid valve. It is installed at the air inlet of the outer pipe of the Nafion drying pipe 31, which can realize water leakage detection, and control the on-off of the solenoid valve through the detection result to prevent the measurement cabin. Internal water damage to internal components.

In order to ensure the normal operation of each element in the measuring device, in this embodiment, an underwater electric control module 4 is also arranged in the connecting cabin, an information collection control system 1 is arranged on the water, and the information collection control system 1 has a shore-based electric control module 11. The shore-based electronic control module 11 includes a power supply module, a communication module, a switch, etc., with a total of 4 interfaces: the shore power is connected through the power interface, and the power supply communication interface is connected to the underwater connection tank through a vulcanized 8-core watertight cable. Realize underwater 220VAC power supply and information transmission. The USB interface and network port can be directly connected to the computer, and the setting of underwater instruments and real-time reading of data can be performed through the host computer software. The underwater electronic control module 4 mainly includes a power supply module and a communication module. The main function of the power module is to convert the 220V AC on the shore into 12V DC, which is used for the diaphragm pump 22, the diaphragm pump 38, the water leakage detection device, the temperature and humidity pressure sensor 35 and the radon probe in the underwater connection cabin. There is a pair of communication modules in the whole system to realize the communication between the underwater temperature, humidity and pressure sensor 35, the PIC radon probe 34 and the shore-based host computer, which has the characteristics of high and stable long-distance transmission rate.

The present embodiment provides a measurement method of a marine radon in-situ measurement device, comprising the following steps:

1) Utilize the diaphragm pump 22 to send seawater into the degassing pipe 23, and utilize the degassing pipe 23 for gas separation;

2) The separated gas enters the drying column 32 through the outer tube of the Nafion drying tube 31 for drying, and then passes into the PIC radon probe 34 for measurement;

3) The measured gas enters the degassing pipe 23 and dissolves into seawater through the inner pipe of the Nafion drying pipe 31 and the gas check valve 37 in turn, and finally is discharged through the liquid check valve 24 .

Adaptive changes made according to actual needs are all within the protection scope of the present invention.

It should be noted that it is obvious to those skilled in the art that the present invention is not limited to the details of the above-mentioned exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. . Therefore, the embodiments are to be regarded in all respects as illustrative and not restrictive, and the scope of the invention is to be defined by the appended claims rather than the foregoing description, which are therefore intended to fall within the scope of the claims. All changes within the meaning and scope of the equivalents of , are included in the present invention. Any reference signs in the claims shall not be construed as limiting the involved claim.

Claims (10)

1. A marine radon in-situ measurement device, characterized in that it comprises a degassing assembly and a measuring assembly located in an underwater connection cabin, the degassing assembly comprises a device for separating gas in seawater, and the measuring The assembly includes a drying part and a measuring part, the drying part is used for removing moisture in the gas, the measuring part is used for in-situ measurement of radon, along the flow direction of the gas, the exhaust port of the degassing component, all the The drying part and the measuring part are communicated in sequence. 2 . The marine radon in situ measurement device according to claim 1 , wherein the drying part comprises a Nafion drying tube and a drying column equipped with a desiccant which are sequentially communicated along the gas flow direction, and the Nafion drying tube comprises a phase jacket. 3 . The inner pipe and the outer pipe are provided, the two ends of the outer pipe are respectively connected with the exhaust port of the degassing assembly and the drying column, and the inner pipe is respectively connected with the measuring part and the air intake of the degassing assembly. mouth connection. 3. The marine radon in-situ measurement device according to claim 2, wherein a gas filter is further provided between the drying column and the measurement part, and the gas filter is used to filter particulate impurities and impurities in the gas. The decay daughter of radon. 4 . The marine radon in situ measurement device according to claim 3 , wherein the detection part comprises a PIC radon probe for measuring radon concentration and a temperature, humidity and pressure sensor for measuring gas temperature, humidity and pressure. 5 . 5 . The marine radon in situ measurement device according to claim 4 , wherein the measurement assembly further comprises a diaphragm air pump for providing power for gas flow, and the diaphragm air pump is located at the inlet of the measurement part. 6 . place. 6. The marine radon in-situ measurement device according to any one of claims 1-5, wherein the degassing assembly comprises a liquid filter, a diaphragm pump, a degassing pipe and a liquid that are sequentially connected along the liquid flow direction a one-way valve; the air inlet and the air outlet of the degassing pipe are the air inlet and the air outlet of the degassing component, respectively. 7 . The marine radon in situ measurement device according to claim 6 , wherein a gas check valve is further provided between the inner pipe and the air inlet of the degassing assembly. 8 . 8 . The marine radon in situ measurement device according to claim 1 , wherein the connecting cabin comprises a measurement cabin and a degassing cabin, and the measurement assembly and the degassing assembly are respectively arranged in the measurement cabin. 9 . In the degassing chamber, the measurement assembly further includes a water leakage detector for detecting water leakage in the measurement chamber. 9 . The marine radon in situ measurement device according to claim 1 , wherein the measurement device further comprises an information acquisition control system arranged on water, the information acquisition control system being connected with the degassing assembly, the The measurement components are electrically connected. 10. A measurement method of a marine radon in-situ measurement device, characterized in that, comprising the following steps: 1) Use the diaphragm pump to send the seawater into the degassing pipe, and use the degassing pipe to separate the gas; 2) The separated gas enters the drying column through the outer tube of the Nafion drying tube for drying, and then passes into the PIC radon probe for measurement; 3) The measured gas enters the degassing pipe through the inner pipe of the Nafion drying pipe and the gas one-way valve in turn and dissolves into the seawater, and finally is discharged through the liquid one-way valve.

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