阅读说明：本技术 一种用于含碘液体回路水质在线分析的流通池 (A flow-through cell for iodine-containing liquid return circuit online analysis of quality of water ) 是由 海正银 王辉 张鹏 季松涛 魏严凇 陈林林 史晓磊 于 2021-08-20 设计创作，主要内容包括：本发明属于碘分析技术领域,具体涉及一种用于含碘液体回路水质在线分析的流通池,连接在含碘液体回路上,包括能够从所述含碘液体回路引入含碘液体的密封的流通池主体(1),所述流通池主体(1)设有能够对所述含碘液体进行测量的PH电极(5)、碘离子选择电极(7)和溶解氧电极(9)。本发明能够实现含碘液体回路中的含碘液体的PH值、碘离子浓度和溶解氧含量的在线测量,对含碘溶液水质的在线监测,可以直接地对液相碘的转化反应进行监控,大大提高了试验的效率。所述流通池由聚四氟乙烯材料制成,避免了因容器壁面对碘的大量吸附而造成的试验干扰,这对该类碘含量很低的试验具有重要意义。(The invention belongs to the technical field of iodine analysis, and particularly relates to a flow cell for online analysis of water quality of an iodine-containing liquid loop, which is connected to the iodine-containing liquid loop and comprises a sealed flow cell main body (1) capable of introducing iodine-containing liquid from the iodine-containing liquid loop, wherein the flow cell main body (1) is provided with a PH electrode (5), an iodide ion selective electrode (7) and a dissolved oxygen electrode (9) capable of measuring the iodine-containing liquid. The invention can realize the on-line measurement of the pH value, the iodide ion concentration and the dissolved oxygen content of the iodine-containing liquid in the iodine-containing liquid loop, can directly monitor the conversion reaction of liquid-phase iodine by on-line monitoring of the water quality of the iodine-containing solution, and greatly improves the efficiency of the test. The flow cell is made of polytetrafluoroethylene materials, so that test interference caused by a large amount of iodine adsorbed by the wall surface of the container is avoided, and the flow cell has important significance on tests with very low iodine content.)

1. The utility model provides a flow-through cell that is used for iodine-containing liquid return circuit quality of water on-line analysis, connects on iodine-containing liquid return circuit, characterized by: including can follow sealed flow-through cell main part (1) of iodine-containing liquid is introduced to iodine-containing liquid return circuit, flow-through cell main part (1) is equipped with can be right PH electrode (5), iodide ion selective electrode (7) and dissolved oxygen electrode (9) that the iodine-containing liquid carries out the measurement.

2. The flow cell of claim 1, which is used for the online analysis of the water quality of the iodine-containing liquid loop and is characterized in that: a first pipeline (19) is arranged at the front end (25) of the flow cell main body (1), the first pipeline (19) is communicated with the flow cell main body (1) through a first connector (2), and the first pipeline (19) is used for being communicated with the iodine-containing liquid loop to realize the introduction of the iodine-containing liquid; the diameter of the first pipe (19) is smaller than the diameter of the first connector (2).

3. The flow cell of claim 2, which is used for the online analysis of the water quality of the iodine-containing liquid loop and is characterized in that: a first pipe sleeve (6) is arranged at the top of the flow cell main body (1), and the tail end of the first pipe sleeve (6) is in sealed communication with the flow cell main body (1); the PH electrode (5) penetrates through the first pipe sleeve (6) from the head end of the first pipe sleeve (6).

4. The flow cell of claim 3 for the on-line analysis of water quality of iodine-containing liquid loop, characterized in that: a second pipe sleeve (8) is arranged at the top of the flow cell main body (1), and the tail end of the second pipe sleeve (8) is hermetically communicated with the flow cell main body (1); the iodide ion selective electrode (7) penetrates through the second pipe sleeve (8) from the head end of the second pipe sleeve (8).

5. The flow cell of claim 4 for the on-line analysis of water quality of iodine-containing liquid loop, which is characterized in that:

a third pipe sleeve (20) is arranged at the top of the flow cell main body (1), the tail end of the third pipe sleeve (20) is in sealed communication with the flow cell main body (1) through a second pipeline (21), and the dissolved oxygen electrode (9) penetrates through the third pipe sleeve (20) from the head end of the third pipe sleeve (20);

a first throttle valve (11) is arranged on the second pipeline (21);

the head end of the second pipeline (21) is in sealed communication with the tail end of the third pipe sleeve (20) through a third joint (10); the tail end of the second pipeline (21) is in sealed communication with the flow cell main body (1) through a fourth connector (12).

6. The flow cell of claim 5 for on-line analysis of iodine-containing liquid loop water quality, characterized by:

the first end of the third pipeline is hermetically connected with one side of the third pipe sleeve (20) through a sixth joint (15);

the circulating pool is characterized by further comprising a fourth pipeline (23) arranged at the top of the circulating pool main body (1), the tail end of the fourth pipeline (23) is in sealed communication with the circulating pool main body (1) through a fifth joint (13), and a second throttle valve (14) is arranged on the fourth pipeline (23);

the iodine circulating pool further comprises a tee joint (16) and a fifth pipeline (24), wherein three interfaces of the tee joint (16) are respectively communicated with the head end of the fourth pipeline (23), the tail end of the third pipeline (22) and the head end of the fifth pipeline (24) in a sealing mode, the tail end of the fifth pipeline (24) is used for being communicated with the iodine-containing liquid loop, and the iodine-containing liquid in the circulating pool main body (1) flows back to the iodine-containing liquid loop;

when the first throttle valve (11) is opened and the second throttle valve (14) is closed, the second pipeline (21), the third pipe sleeve (20), the third pipeline (22) and the fifth pipeline (24) form a passage containing the dissolved oxygen electrode (9) and are communicated with the iodine-containing liquid loop, and the dissolved oxygen content of the iodine-containing liquid can be measured by using the dissolved oxygen electrode (9);

when the first throttle valve (11) is closed and the second throttle valve (14) is opened, the fourth pipeline (23) and the fifth pipeline (24) form a passage not containing the dissolved oxygen electrode (9) and communicate with the iodine-containing liquid circuit, at which time the dissolved oxygen content of the iodine-containing liquid cannot be measured using the dissolved oxygen electrode (9).

7. The flow cell of claim 6, which is used for the online analysis of the water quality of the iodine-containing liquid loop and is characterized in that: a sixth pipeline (4) is arranged at the bottom of the flow cell main body (1), the head end of the sixth pipeline (4) is communicated with the flow cell main body (1) in a sealing mode through a second connector (3), and a third throttle valve (18) is arranged on the sixth pipeline (4); the sixth pipeline (4) is used for discharging the liquid in the flow-through cell main body (1).

8. The flow cell of claim 7 for on-line analysis of iodine-containing liquid loop water quality, characterized by: a seventh joint (17) is arranged at the rear end (26) of the flow cell main body (1) and is used for connecting an external water source and cleaning the interior of the flow cell main body (1), and when the external water source is not connected, the seventh joint (17) is in a sealing state and keeps the interior of the flow cell main body (1) sealed; the front end (25) and the rear end (26) are opposite to each other.

9. The flow cell of claim 8, which is used for the online analysis of the water quality of the iodine-containing liquid loop and is characterized in that: the PH electrode (5), the iodine ion selective electrode (7), the dissolved oxygen electrode (9) and the fourth pipeline (23) are sequentially arranged from the first pipeline (19) of the front end (25) to the seventh joint (17) of the rear end (26) at the top of the flow cell main body (1).

10. The flow cell of claim 9 for on-line analysis of iodine-containing liquid loop water quality, characterized by:

the PH electrode (5), the iodide ion selective electrode (7) and the dissolved oxygen electrode (9) are all made of glass;

the flow cell main body (1), the first joint (2), the second joint (3), the sixth pipeline (4), the first pipe sleeve (6), the second pipe sleeve (8), the third joint (10), the first throttle valve (11), the fourth joint (12), the fifth joint (13), the second throttle valve (14), the sixth joint (15), the tee joint (16), the seventh joint (17), the third throttle valve (18), the first pipeline (19), the third pipe sleeve (20), the second pipeline (21), the third pipeline (22), the fourth pipeline (23) and the fifth pipeline (24) are all made of polytetrafluoroethylene;

the first joint (2), the second joint (3), the third joint (10), the fourth joint (12), the fifth joint (13), the sixth joint (15) and the seventh joint (17) are all NPT rotating sleeve joints.

Technical Field

The invention belongs to the technical field of iodine analysis, and particularly relates to a flow cell for online analysis of water quality of an iodine-containing liquid loop.

Background

Iodine is one of fission products generated by a reactor core of a light water reactor, under the condition of a reactor accident, the iodine is taken as an important radiation source, the form of the iodine which is initially released from fuel is mostly in an ionic state, most of ionic iodine is settled or directly settled after being attached to a wall surface and enters a water pool of the reactor core, but the ionic iodine does not exist in a water environment stably all the time, part of the ionic iodine can be further converted into elemental iodine under a specific environmental condition, so that the elemental iodine is volatilized again to enter a gaseous space of a containment vessel and is released to the external environment through a containment vessel defect or an exhaust system, and therefore the iodine is considered to have the greatest relationship with public health.

Factors influencing the conversion of ionic iodine to elemental iodine in the water tank mainly include pH value, temperature, irradiation dose rate, concentration of iodide ions, organic substances and the like. In order to be able to systematically and quantitatively assess the iodine content and morphology in gaseous spaces, it is necessary to study the effect of the water chemistry conditions of the pool water on the conversion of ionic iodine to elemental iodine.

As for the research on the behavior of iodine under accident conditions of pressurized water reactors, although the domestic state is still in the beginning stage, a great deal of research work has been carried out internationally, in the research process, the change conditions of parameters such as liquid-phase iodide ion concentration, solution PH value, system dissolved oxygen content and the like can intuitively reflect the iodine conversion condition, is important information to be known in the test process, an analysis unit is added in a liquid phase loop at present and is specially used for analyzing and measuring the information in the loop, in the analysis process, part of liquid needs to be led out for analysis, not only real-time on-line monitoring can not be realized, but also the operation is more complicated, and sometimes the analytical liquid is contaminated by the addition of other analytical reagents during the analysis and therefore cannot flow into the circulation circuit again, along with the increase of the measurement times, the liquid in the circulation loop is continuously reduced, so that the whole test is greatly influenced; in addition, the analysis unit is easy to have dead angles, is not easy to clean, and has errors which cause higher measured values after long-term use.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a device capable of monitoring parameters such as the concentration of iodide ions, the pH value of a solution, the dissolved oxygen content of a system and the like in an iodine-containing liquid phase circulation loop in real time on line.

In order to achieve the purpose, the technical scheme adopted by the invention is that the flow cell for online analysis of the water quality of the iodine-containing liquid loop is connected to the iodine-containing liquid loop, wherein the flow cell comprises a sealed flow cell main body which can introduce iodine-containing liquid from the iodine-containing liquid loop, and the flow cell main body is provided with a PH electrode, an iodide ion selective electrode and a dissolved oxygen electrode which can measure the iodine-containing liquid.

Further, a first pipeline is arranged at the front end of the flow cell main body, the first pipeline is communicated with the flow cell main body through a first connector, and the first pipeline is used for being communicated with the iodine-containing liquid loop to realize the introduction of the iodine-containing liquid; the diameter of the first pipeline is smaller than that of the first joint.

Further, a first pipe sleeve is arranged at the top of the flow cell main body, and the tail end of the first pipe sleeve is hermetically communicated with the flow cell main body; the PH electrode penetrates through the first pipe sleeve from the head end of the first pipe sleeve.

Further, a second pipe sleeve is arranged at the top of the flow cell main body, and the tail end of the second pipe sleeve is communicated with the flow cell main body in a sealing manner; the iodide ion selective electrode penetrates through the second pipe sleeve from the head end of the second pipe sleeve.

Further, in the present invention,

a third pipe sleeve is arranged at the top of the flow cell main body, the tail end of the third pipe sleeve is hermetically communicated with the flow cell main body through a second pipeline, and the dissolved oxygen electrode penetrates into the third pipe sleeve from the head end of the third pipe sleeve;

a first throttle valve is arranged on the second pipeline;

the head end of the second pipeline is in sealed communication with the tail end of the third pipe sleeve through a third joint; and the tail end of the second pipeline is communicated with the flow cell main body in a sealing way through a fourth joint.

Further, in the present invention,

the head end of the third pipeline is hermetically connected with one side of the third pipe sleeve through a sixth joint;

the tail end of the fourth pipeline is communicated with the flow cell main body in a sealing mode through a fifth joint, and a second throttling valve is arranged on the fourth pipeline;

the iodine-containing liquid circulating tank further comprises a tee joint and a fifth pipeline, wherein three ports of the tee joint are respectively in sealed communication with the head end of the fourth pipeline, the tail end of the third pipeline and the head end of the fifth pipeline, and the tail end of the fifth pipeline is used for being communicated with the iodine-containing liquid loop to realize backflow of iodine-containing liquid in the circulating tank main body to the iodine-containing liquid loop;

when the first throttle valve is opened and the second throttle valve is closed, the second pipeline, the third pipe sleeve, the third pipeline and the fifth pipeline constitute a passage containing the dissolved oxygen electrode and are communicated with the iodine-containing liquid loop, and the dissolved oxygen content of the iodine-containing liquid can be measured by using the dissolved oxygen electrode;

when the first throttle valve is closed and the second throttle valve is open, the fourth line and the fifth line constitute a passage that does not contain the dissolved oxygen electrode and communicate with the iodine-containing liquid circuit, at which time the dissolved oxygen content of the iodine-containing liquid cannot be measured using the dissolved oxygen electrode.

Furthermore, a sixth pipeline is arranged at the bottom of the flow cell main body, the head end of the sixth pipeline is communicated with the flow cell main body in a sealing manner through a second joint, and a third throttle valve is arranged on the sixth pipeline; the sixth pipeline is used for discharging the liquid in the flow-through cell main body.

Further, a seventh joint is arranged at the rear end of the flow cell main body and used for connecting an external water source and cleaning the interior of the flow cell main body, and the seventh joint is in a sealed state when the external water source is not connected and keeps the interior of the flow cell main body sealed; the front end and the rear end are opposite to each other.

Further, the PH electrode, the iodide ion selective electrode, the dissolved oxygen electrode, and the fourth pipeline are sequentially arranged at the top of the flow cell body in a direction from the first pipeline at the front end to the seventh joint at the rear end.

Further, in the present invention,

the PH electrode, the iodide ion selective electrode and the dissolved oxygen electrode are all made of glass;

the flow cell main body, the first joint, the second joint, the sixth pipeline, the first pipe sleeve, the second pipe sleeve, the third joint, the first throttle valve, the fourth joint, the fifth joint, the second throttle valve, the sixth joint, the tee joint, the seventh joint, the third throttle valve, the first pipeline, the third pipe sleeve, the second pipeline, the third pipeline, the fourth pipeline and the fifth pipeline are all made of polytetrafluoroethylene;

the first joint, the second joint, the third joint, the fourth joint, the fifth joint, the sixth joint, and the seventh joint are all NPT ferrule joints.

The invention has the beneficial effects that:

1. the flow cell can realize multiple functions in the iodine-containing liquid loop, and firstly, the liquid loop circulates circularly; secondly, monitoring the concentration of iodide ions, the pH value of the solution and the content of dissolved oxygen in the liquid loop in real time on line; thirdly, the cleaning of the analysis electrode is convenient, and the analysis error caused by the dead angle around the analysis electrode is avoided (the analysis electrode comprises a PH electrode 5, an iodide ion selection electrode 7 and a dissolved oxygen electrode 9); fourth, the discharge of the circuit liquid. The operation for realizing each function is simple and convenient, so the method has higher use value.

2. The flow-through cell can realize the on-line monitoring to its iodide ion concentration, pH value, dissolved oxygen at iodine-containing liquid circulation flow in-process, need not to take a sample earlier and analyze again, and convenient operation is swift when, has reduced because of the many times sample analysis arouses the experimental error that the liquid total amount reduces and cause to greatly increased experimental degree of accuracy.

3. The whole flow cell body that reaches is big to the flow cell main part, and little to every thread bush to and every pipeline of connection all adopt polytetrafluoroethylene material to make, avoided adsorbing the interference that iodine caused to the experiment because of the wall, this has extremely important meaning to the lower experiment of this kind of iodine content.

Drawings

FIG. 1 is a schematic diagram of a flow cell for on-line analysis of iodine-containing liquid loop water quality according to an embodiment of the present invention;

in the figure: 1-flow cell body, 2-first joint, 3-second joint, 4-sixth pipeline (loop drain), 5-PH electrode, 6-first pipe sleeve, 7-iodide ion selective electrode, 8-second pipe sleeve, 9-dissolved oxygen electrode, 10-third joint, 11-first throttle valve, 12-fourth joint, 13-fifth joint, 14-second throttle valve, 15-sixth joint, 16-tee, 17-seventh joint, 18-third throttle valve, 19-first pipeline, 20-third pipe sleeve, 21-second pipeline, 22-third pipeline, 23-fourth pipeline, 24-fifth pipeline, 25-front end, 26-back end.

Detailed Description

The invention is further described below with reference to the figures and examples.

As shown in fig. 1, the flow cell for online analysis of water quality of an iodine-containing liquid loop provided by the invention is connected to the iodine-containing liquid loop, and comprises a sealed flow cell main body 1 capable of introducing iodine-containing liquid from the iodine-containing liquid loop, wherein the flow cell main body 1 is provided with a PH electrode 5 capable of measuring the iodine-containing liquid, an iodide ion selective electrode 7 and a dissolved oxygen electrode 9.

The front end 25 of the flow cell main body 1 is provided with a first pipeline 19, the first pipeline 19 is communicated with the flow cell main body 1 through a first connector 2, and the first pipeline 19 is used for being communicated with an iodine-containing liquid loop to realize the introduction of iodine-containing liquid; the diameter of the first pipe 19 is smaller than the diameter of the first connection 2.

A first pipe sleeve 6 is arranged at the top of the flow cell main body 1, and the tail end of the first pipe sleeve 6 is hermetically communicated with the flow cell main body 1; the PH electrode 5 is inserted into the first socket 6 from the head end of the first socket 6.

A second pipe sleeve 8 is arranged at the top of the flow cell main body 1, and the tail end of the second pipe sleeve 8 is hermetically communicated with the flow cell main body 1; the iodide ion selective electrode 7 is inserted into the second pipe sleeve 8 from the head end of the second pipe sleeve 8.

A third pipe sleeve 20 is arranged at the top of the flow cell main body 1, the tail end of the third pipe sleeve 20 is hermetically communicated with the flow cell main body 1 through a second pipeline 21, and the dissolved oxygen electrode 9 penetrates through the third pipe sleeve 20 from the head end of the third pipe sleeve 20;

a first throttle valve 11 is arranged on the second pipeline 21;

the head end of the second pipeline 21 is in sealed communication with the tail end of the third pipe sleeve 20 through the third joint 10; the tail end of the second pipeline 21 is in sealed communication with the flow cell body 1 through a fourth joint 12.

The first pipeline 22 is connected with one side of the third pipe sleeve 20 in a sealing mode through a sixth joint 15;

the device also comprises a fourth pipeline 23 arranged at the top of the flow cell main body 1, the tail end of the fourth pipeline 23 is hermetically communicated with the flow cell main body 1 through a fifth joint 13, and a second throttling valve 14 is arranged on the fourth pipeline 23;

the iodine circulating pool further comprises a tee joint 16 and a fifth pipeline 24, three interfaces of the tee joint 16 are respectively communicated with the head end of the fourth pipeline 23, the tail end of the third pipeline 22 and the head end of the fifth pipeline 24 in a sealing mode, the tail end of the fifth pipeline 24 is used for being communicated with an iodine-containing liquid loop, and the iodine-containing liquid in the circulating pool main body 1 flows back to the iodine-containing liquid loop;

when the first throttle valve 11 is opened and the second throttle valve 14 is closed, the second pipeline 21, the third pipe sleeve 20, the third pipeline 22 and the fifth pipeline 24 constitute a passage containing the dissolved oxygen electrode 9 and are communicated with the iodine-containing liquid loop, and the dissolved oxygen electrode 9 can be used for measuring the dissolved oxygen content of the iodine-containing liquid;

when the first throttle valve 11 is closed and the second throttle valve 14 is opened, the fourth piping 23 and the fifth piping 24 constitute a passage not containing the dissolved oxygen electrode 9 and communicate with the iodine-containing liquid circuit, at which time the dissolved oxygen content of the iodine-containing liquid cannot be measured using the dissolved oxygen electrode 9.

A sixth pipeline 4 is arranged at the bottom of the flow cell main body 1, the head end of the sixth pipeline 4 is hermetically communicated with the flow cell main body 1 through a second connector 3, and a third throttle valve 18 is arranged on the sixth pipeline 4; the sixth pipe 4 is for discharging the liquid in the flow cell body 1.

The rear end 26 of the flow cell main body 1 is provided with a seventh joint 17 which is used for connecting an external water source and cleaning the interior of the flow cell main body 1, and when the external water source is not connected, the seventh joint 17 is in a sealing state and keeps the interior of the flow cell main body 1 sealed; the front end 25 and the rear end 26 are opposite to each other.

On the top of the flow cell body 1, a PH electrode 5, an iodide ion selective electrode 7, a dissolved oxygen electrode 9, and a fourth line 23 are sequentially arranged from the first line 19 at the front end 25 to the seventh junction 17 at the rear end 26.

The PH electrode 5, the iodine ion selection electrode 7 and the dissolved oxygen electrode 9 are all made of glass;

the material of the flow-through cell main body 1, the first joint 2, the second joint 3, the sixth pipeline 4, the first pipe sleeve 6, the second pipe sleeve 8, the third joint 10, the first throttle valve 11, the fourth joint 12, the fifth joint 13, the second throttle valve 14, the sixth joint 15, the tee joint 16, the seventh joint 17, the third throttle valve 18, the first pipeline 19, the third pipe sleeve 20, the second pipeline 21, the third pipeline 22, the fourth pipeline 23 and the fifth pipeline 24 is polytetrafluoroethylene;

the first joint 2, the second joint 3, the third joint 10, the fourth joint 12, the fifth joint 13, the sixth joint 15 and the seventh joint 17 are all NPT ferrule joints.

The invention provides a flow cell for iodine-containing liquid loop water quality on-line analysis, which has the specific application that:

the fifth pipeline 24 (being used for going out the liquid) on the tee bend 16 that passes through front end 25 respectively connects 2 (being used for the feed liquor) and is close to rear end 26 in the iodine-containing liquid return circuit (liquid phase circulation circuit) with the pipe connection of iodine-containing liquid return circuit, the iodine-containing liquid in the iodine-containing liquid return circuit like this when passing through flow cell main part 1, the PH value, the iodide ion concentration, the dissolved oxygen value of iodine-containing liquid can carry out online real-time measurement. Wherein whether the dissolved oxygen content in the iodine-containing liquid is measured or not can also be regulated by the first throttle valve 11 and the second throttle valve 14. Opening the first throttle valve 11 while closing the second throttle valve 14 allows measurement of the dissolved oxygen content of the iodine-containing liquid, whereas the iodine-containing liquid passes directly through the second throttle valve 14 and the tee 16 without flowing through the dissolved oxygen electrode 9.

Example 1

In the research test of the conversion behavior of the ionic iodine in the pool water to the elemental iodine under the reactor accident condition, the test relates to a reaction kettle, an iodine-containing liquid loop and an iodine-containing gas loop, and gas-liquid phases can respectively realize online sampling for iodine analysis. Specifically, the method comprises the following steps:

the reaction kettle is used for stirring the iodine-containing solution and converting the iodine into different chemical forms and physical forms under different conditions, and is provided with a water bath heating device and a stirrer;

the water replenishing tank is used for replenishing liquid media to the reaction kettle;

the iodine-containing liquid loop comprises:

the two ends of the first circulating pipeline are respectively communicated with the reaction kettle and are used for circulating the iodine-containing solution and sampling a liquid phase;

the internal circulating pump is used for generating circulating power in the iodine-containing liquid in the first circulating pipeline;

the heating circulating pot is used for heating the iodine-containing solution in the first circulating pipeline;

the cooling circulator is used for cooling the liquid in the first circulating pipeline before the analysis electrode flows into the first circulating pipeline;

the iodine-containing gas loop comprises:

the two ends of the second circulating pipeline are respectively communicated with the reaction kettle and are used for circulating the iodine-containing gas and sampling a gas phase;

and the gas loop circulating pump is used for generating circulating power in the second circulating pipeline.

Before the test is started, firstly, the PH electrode 5 in the first pipe sleeve 6, the iodide ion selective electrode 7 in the second pipe sleeve 8 and the dissolved oxygen electrode 9 in the third pipe sleeve 20 are reasonably installed and the circuit connection is good; the iodide ion concentration is 10^-3Pouring 3L of a solution with the M/L (namely, the concentration of iodide ions is 127ppm) and the pH value of 3 into a water replenishing box, opening an internal circulating pump to start circulation after the solution enters a reaction kettle and confirming that the pipeline and a valve are well sealed, wherein the solution in the reaction kettle passes through a main body 1 of a flow cell, but a loop of the iodine-containing liquid does not reach a stable state at the moment, so that the pH value, the concentration value of the iodide ions and the dissolved oxygen value displayed by an instrument are in a change state, and the display value of the instrument also reaches a stable value after the loop of the iodine-containing liquid reaches the stable state, wherein the pH value is 3.02, the concentration of the iodide ions is 126ppm, and the dissolved oxygen value is 8.02 mg/L; starting a stirrer in the reaction kettle, adjusting the stirring speed to 55r/min, opening a heating circulating pot, a cooling circulating machine and an iodine-containing gas loop circulating pump in an iodine-containing liquid loop, and starting timing after the solution is heated to a temperature value of 80 ℃ required by an experiment; and respectively carrying out gas-liquid two-phase online sampling at the sampling ports of the two gas-liquid loops every 20h within 100h of the reaction according to the test requirement, then opening a third throttle valve 18 below the flow cell main body 1, and discharging the solution of the iodine-containing liquid loop from a sixth pipeline 4 below the flow cell main body 1. The entire iodine containing liquid loop is then rinsed several times with deionized water until clean. Finally, the seventh joint 17 at the rear end 26 of the flow cell body 1 is opened, and deionized water is continuously injected into the flow cell body 1 to clean the dead space in the flow cell body 1 while waste liquid is continuously discharged from the sixth pipe 4 (return drain) below the flow cell body 1.

Example 2

In contrast to example 1, the solution was added to an iodide ion concentration of 10^-4M/L (i.e., iodide ion concentration of 12.7 ppm).

Example 3

In contrast to example 1, the pH of the iodine ion-containing solution added was 7.

The device according to the present invention is not limited to the embodiments described in the specific embodiments, and those skilled in the art can derive other embodiments according to the technical solutions of the present invention, and also belong to the technical innovation scope of the present invention.