CN211856236U - Hydrogen peroxide concentration monitoring device - Google Patents

Abstract

The utility model discloses a hydrogen peroxide concentration monitoring device, and relates to the field of concentration monitoring. The hydrogen peroxide concentration monitoring device comprises an injection pipeline, an injection valve, a detection chamber, a pressure difference guide tube, a pressure difference drain valve, a liquid level meter and a temperature detector; the injection pipeline is provided with an injection valve; a hydrogen peroxide decomposition catalyst is provided in the detection chamber; one end of the pressure difference guide tube is inserted into the liquid to be tested in the detection chamber, and the other end is located outside the detection chamber, the pressure difference guide tube has at least one section of the pipe section higher than the liquid level of the liquid to be tested in the detection chamber, and the pressure difference drain valve is provided on the pressure difference guide tube; when the injection valve and the pressure difference drain valve are both closed, the detection chamber is sealed as a gas-sealed detection chamber; when the pressure difference drain valve is opened, the liquid to be tested in the detection chamber flows out from the pressure difference guide tube under the action of the internal air pressure; the liquid level meter is used to detect the liquid level data; and the temperature detector is used to detect the temperature. The utility model can be used to measure the hydrogen peroxide concentration of the liquid to be tested in the reaction pool to be tested.

Description

Hydrogen peroxide concentration monitoring device

technical field

The utility model relates to the field of concentration monitoring, in particular to a hydrogen peroxide concentration monitoring device.

Background technique

At present, the Fenton reaction is widely used in the field of wastewater treatment. The inorganic chemical reaction process of the Fenton reaction is: the mixed solution of hydrogen peroxide and ferrous ^ion Fe Alcohols and esters are oxidized to inorganic state. The Fenton reaction has a high ability to remove refractory organic pollutants. Hydrogen peroxide is commonly known as hydrogen peroxide. When using the Fenton reaction to treat wastewater, it is necessary to monitor the concentration of hydrogen peroxide in the reaction solution, adjust the amount of hydrogen peroxide in time, and improve the efficiency of the Fenton reaction.

However, in the prior art, a device that can be used to monitor the hydrogen peroxide concentration in the Fenton reaction cell is lacking.

Utility model content

In order to overcome the deficiencies of the prior art, the purpose of the present invention is to provide a hydrogen peroxide concentration monitoring device.

The purpose of this utility model adopts following technical scheme to realize:

Hydrogen peroxide concentration monitoring device, including sampling pipeline, sampling valve, detection chamber, differential pressure guide tube, differential pressure discharge valve, liquid level gauge and temperature detector;

The sampling pipeline is provided with the sampling valve; the sampling pipeline is configured to send the liquid to be tested in the reaction tank to be tested to the detection chamber when the sampling valve is opened; The detection chamber is provided with a hydrogen peroxide decomposition catalyst, and the hydrogen peroxide decomposition catalyst is used to catalyze the decomposition reaction of the hydrogen peroxide in the detection chamber;

One end of the differential pressure conduit is inserted into the liquid to be measured in the detection chamber, and the other end is located outside the detection chamber. The differential pressure conduit has at least a section higher than the liquid level of the liquid to be measured in the detection chamber. The pressure difference discharge valve is arranged on the pressure difference guide pipe; when both the sample injection valve and the pressure difference discharge valve are closed, the detection chamber is closed as a gas-tight detection chamber;

The differential pressure discharge valve is used to open when the internal air pressure in the gas-tight detection chamber is higher than the external atmospheric pressure, so that the liquid to be tested in the detection chamber flows out from the differential pressure conduit under the action of the internal air pressure ; the liquid level meter is used to detect the liquid level data of the liquid to be tested in the detection chamber; the temperature detector is used to detect the temperature of the detection chamber.

Further, the differential pressure guide tube is an inverted U-shaped tube, the side wall of the detection chamber is provided with an opening, and the first end of the inverted U-shaped tube extends into the detection chamber through the opening; the pressure The differential discharge valve is arranged on the pipe portion of the inverted U-shaped pipe located outside the detection chamber.

Further, the liquid level gauge is an ultrasonic level gauge.

Further, a sampling pump is also included, and the sampling pump is connected with the sampling pipeline to provide power for pumping the liquid to be tested in the reaction cell to be tested to the detection chamber.

Further, the detection chamber is filled with the particulate hydrogen peroxide splitting catalyst, and the hydrogen peroxide splitting catalyst includes manganese dioxide particles.

Further, the detection chamber is provided with a sample discharge port for discharging the liquid to be tested, and the filter screen is provided on the sample discharge port.

Further, it also includes a flushing water tank, a flushing pipeline, a flushing pump and a flushing valve; the flushing valve is arranged in the flushing pipeline; the flushing water tank is used for holding flushing liquid, and the flushing pipeline is used for connecting the flushing water tank with the flushing water tank. the detection chamber is communicated; the flushing pump is used for providing power to pump the flushing liquid in the flushing water tank into the detection chamber through the flushing pipeline when the flushing valve is opened;

When the flushing valve, the sampling valve and the differential pressure discharge valve are all closed, the detection chamber is a gas-tight detection chamber.

Further, the sampling pump is shared with the flushing pump, and is a sampling flushing pump; the sampling flushing pump has a water inlet and a water outlet;

The monitoring device further comprises a connecting dry pipe, one end of the sampling pipe is connected to the reaction cell to be tested, and the other end is connected to the connecting dry pipe; one end of the flushing pipe is connected to the reaction cell to be tested, and the other end is connected to the reaction cell to be tested. One end is connected with the connecting trunk;

The connecting main pipe is connected with the water inlet, and the water outlet is connected with the detection chamber.

Further, it also includes a sample discharge pipeline, a sample discharge valve and a sample discharge pump; the detection chamber is provided with a sample discharge port; the sample discharge pipeline is connected with the sample discharge port, and the sample discharge valve is arranged in the discharge port. The sampling pipeline; the sampling pump is used for providing power to discharge the liquid in the detection chamber through the sampling pipeline when the sampling valve is opened.

Further, it also includes a reaction pool to be tested for containing the liquid to be tested, the upper side of the reaction pool to be tested is provided with an opening, and the end of the discharge pipe away from the detection chamber passes through the opening to remove the liquid in the detection chamber. The liquid is sent to the reaction cell to be tested.

Compared with the prior art, the beneficial effects of the present utility model are:

It can be used to sample and test the liquid in the Fenton reaction tank, and use hydrogen peroxide to decompose under the action of a catalyst to measure the concentration of hydrogen peroxide in the liquid to be tested.

Description of drawings

Fig. 1 is the schematic diagram one of the hydrogen peroxide concentration monitoring device of the present invention;

Fig. 2 is the enlarged view of A part in Fig. 1;

Fig. 3 is the schematic diagram two of the hydrogen peroxide concentration monitoring device of the present invention;

FIG. 4 is a schematic diagram of the detection chamber of the present invention.

In the figure: 10, detection room; 21, sampling pipeline; 22, sampling pump; 23, sampling valve; 30, flushing water tank; 31, flushing pipeline; 32, flushing pump; 33, flushing valve; 41, sampling Pipeline; 42. Sampling pump; 43. Sampling valve; 50. Sampling flushing pump; 61. Differential pressure diversion pipe; 62. Differential pressure discharge valve; 71. Liquid level gauge; 72. Temperature detector; 80 , PLC display terminal; 90, the reaction pool to be tested.

Detailed ways

Hereinafter, the present invention will be further described with reference to the accompanying drawings and specific embodiments. It should be noted that, on the premise of no conflict, the embodiments or technical features described below can be combined arbitrarily to form new implementations. example.

As shown in Figures 1-4, the present embodiment provides a hydrogen peroxide concentration monitoring device, the hydrogen peroxide concentration monitoring device includes a sampling pipeline 21, a sampling valve 23, a detection chamber 10, a differential pressure conduit 61, and a differential pressure discharge valve 62 and level gauge 71.

The monitoring device of this embodiment is used for sampling monitoring from the reaction cell 90 to be tested containing the Fenton reaction liquid. The liquid to be tested in the reaction cell 90 to be tested contains hydrogen peroxide, and the monitoring device is used to monitor the concentration of hydrogen peroxide.

Specifically, the sample injection pipeline 21 is used to communicate the reaction cell 90 to be tested with the detection chamber 10; the sample injection pipeline 21 is provided with a sample injection valve 23; The liquid to be tested in the reaction tank 90 to be tested is sent to the detection chamber 10; the detection chamber 10 is provided with a sample discharge port, and the sample discharge valve 43 is used to close or open the sample discharge port. When the sample discharge valve 43 is opened, the detection chamber The liquid in 10 can be discharged from the sample outlet for the next monitoring; the detection chamber 10 is provided with a hydrogen peroxide decomposition catalyst. When the hydrogen peroxide decomposition catalyst is in contact with the hydrogen peroxide, it is used to catalyze the generation of hydrogen peroxide in the liquid to be tested in the detection chamber 10. decomposition reaction;

One end of the differential pressure guide tube 61 is inserted into the liquid to be measured in the detection chamber 10 , and the other end is located outside the detection chamber 10 . The differential pressure discharge valve 62 is arranged on the differential pressure diversion pipe 61; when the sample injection valve 23, the sample discharge valve 43 and the differential pressure discharge valve 62 are all closed, the detection chamber 10 is closed as a gas-tight detection chamber 10; the differential pressure The drain valve 62 is used to open when the internal air pressure in the gas-tight detection chamber 10 is higher than the external atmospheric pressure, so that the liquid to be tested in the detection chamber 10 flows out from the second end of the differential pressure guide pipe 61 under the action of the internal air pressure ; The liquid level meter 71 is used to measure the liquid level data of the liquid to be measured in the detection chamber 10 .

Preferably, in this embodiment, one end of the sample introduction pipe 21 is inserted into the reaction solution of the reaction cell 90 to be tested, and the other end is connected to the upper end of the detection chamber 10; Likewise, in some other embodiments, the sample discharge port may also be located at the upper end of the detection chamber 10 .

Preferably, since the liquid to be tested contains a strong oxidant, in order to ensure the normal operation of the system, the sampling pipeline 21 in this embodiment is a corrosion-resistant pipeline.

On the basis of the above structure, the sample introduction pipeline 21 of the present embodiment sends the liquid to be tested in the reaction cell 90 to be tested to the detection chamber 10 in the following manner:

The hydrogen peroxide concentration monitoring device is also provided with a sampling pump 22, which is connected to the sampling pipeline 21. When the sampling valve 23 is opened, the sampling pump 22 is started to provide power to transfer the liquid to be measured from the reaction pool to be measured. 90 is pumped to the detection chamber 10, and the sample injection pump 22 in this embodiment is used to pump the quantitative liquid to be tested to the detection chamber 10; the sample injection pipeline 21 in this embodiment includes a first pipeline and a second pipeline; the first pipeline One end of the pipeline is inserted into the reaction tank 90 to be tested, and the other end is connected with the water inlet of the sampling pump 22; one end of the second pipeline is connected with the water outlet of the sampling pump 22, and the other end is connected with the sampling inlet of the detection chamber 10; The sampling valve 23 is provided in the second pipeline. In some other embodiments, the injection pump 22 can also be arranged in other positions.

In some other embodiments, the liquid to be tested in the reaction cell 90 to be tested can also be sent to the detection chamber 10 in the following manner:

The liquid outlet of the sample introduction pipeline 21 is set to be lower than the liquid level of the reaction tank 90 to be tested, such as lower than the reaction tank 90 to be tested; in this way, the principle of the communication device can be used to connect the reaction tank 90 to be tested through the sample introduction pipeline 21. The reaction solution inside is led to the detection chamber 10 .

The hydrogen peroxide concentration work flow of the hydrogen peroxide concentration monitoring device in the present embodiment is:

Sampling step: the sampling valve 43 is closed, the sampling pump 22 and the sampling valve 23 are opened, and a certain amount of the liquid to be measured in the reaction tank 90 to be measured enters the detection chamber 10 through the sampling pipeline 21, and the sampling valve 23 is closed;

Monitoring step: the liquid to be tested containing hydrogen peroxide is in contact with the hydrogen peroxide decomposition catalyst in the detection chamber 10, and under the action of the catalyst, the hydrogen peroxide is decomposed to generate water and oxygen; at this time, because the sampling valve 43 and the sampling valve 23 are closed , the detection chamber 10 is sealed as a gas-tight detection chamber 10, and as the hydrogen peroxide decomposes under the action of a catalyst to release oxygen, the pressure in the detection chamber 10 rises; after the hydrogen peroxide decomposition reaction time (about 1-10min) ends, open the pressure Differential discharge valve 62, since the gas pressure inside the detection chamber 10 is higher than the external atmospheric pressure, under the action of the air pressure inside the detection chamber 10, the liquid to be tested is discharged to the outside of the detection chamber 10 through the differential pressure guide pipe 61 until the internal and external air pressure The liquid level meter 71 is used to record the liquid level to obtain the liquid level difference, and the temperature detector 72 is used to record the temperature in the detection chamber 10 .

Through the measured liquid level data and indoor temperature value, the principle of obtaining the hydrogen peroxide concentration value is as follows:

As shown in FIG. 4 , the volume of the liquid to be tested in the lower part of the detection chamber 10 is V ₁ , the volume of the gas in the upper part is V ₂ , and V ₁ +V ₂ =V.

Assuming that the content of hydrogen peroxide in the detection liquid is x, the molar equivalent of oxygen is decomposed:

m=0.5ρV ₁ x (formula 1);

Regardless of the dissolution of oxygen in the liquid to be tested, assuming that the oxygen is completely released into the upper space V ₂ of the detection chamber 10 , according to the van der Waals equation of oxygen, the pressure value and the volume satisfy the formula 2:

P=0.5ρV ₁ xRT/(V ₁ -b)-a/V ² (Equation 2);

Wherein, T is the temperature (K), T is the temperature value measured by the temperature detector 72; R is the gas equation constant; a is 0.1378 (Pa.m ⁶ .mol ^-2 ); b is 3.183*10 ^-5 ( m ³ .mol ^-1 ), a and b are the van der Waals equation constants of oxygen;

Ignoring the quadratic term, there is formula 3:

V=0.5ρV ₁ xRT/P+b (formula 3);

Assuming that the cross-sectional area of the detection chamber 10 is S, the drop of the liquid level height Δh in the detection chamber 10 satisfies Formula 4:

Δh=(0.5ρV ₁ xRT/P+b)/S(Formula 4);

Thereby, the relationship equation between the liquid level drop height Δh, the temperature T of the detection chamber 10 and the hydrogen peroxide concentration x can be established, so that the change of the hydrogen peroxide concentration x can be detected by the change of the liquid level height.

It should be noted that when a certain size of the detection chamber 10 is selected, the V value and the S value can be obtained.

In this embodiment, the liquid to be tested in the reaction cell 90 to be tested can be introduced into the detection chamber 10 through the setting of the sample introduction pipeline 21; Decomposition reaction can occur; by setting the closure of the sample injection valve 23, the differential pressure discharge valve 62 and the sample discharge valve 43, a sealed reaction space can be provided to avoid the leakage of oxygen generated by the hydrogen peroxide decomposition reaction; The setting of the liquid level gauge 71 can utilize the characteristic that the hydrogen peroxide decomposition reaction generates gas to increase the air pressure in the detection chamber 10. The liquid level difference Δh can be detected by the liquid level gauge 71, and then the temperature T measured by the temperature detector 72 can be obtained. , the hydrogen peroxide concentration x can be calculated according to formula 4.

Because when the differential pressure discharge valve 62 is opened, if each part of the differential pressure guide pipe 61 is located on the lower side of the liquid surface, according to the principle of the connector, even if the air pressure in the detection chamber 10 is equal to the external atmospheric pressure, the waiting room in the detection chamber 10 will not The liquid to be measured will also flow out along the differential pressure guide pipe 61, so in this embodiment, the differential pressure guide pipe 61 is set so that at least one section of the pipe section is located above the liquid level of the liquid to be measured, so as to ensure that the outflow of the liquid to be measured is only equal to the amount of the liquid to be measured. The pressure difference between the inside and outside of the chamber 10 is related.

The monitoring device of this embodiment can realize the lateral top of the concentration of hydrogen peroxide, which is beneficial to control the residual amount of hydrogen peroxide after the Fenton reaction is completed.

In this embodiment, a monitoring point is set at the water outlet of the reaction tank 90 to be tested, and one or two monitoring points are set in the neutralization and degassing tank. As the upper limit of the reduction of the amount of hydrogen peroxide added, each monitoring point is equipped with a hydrogen peroxide concentration monitoring device, so that the amount of hydrogen peroxide can be adjusted according to the monitoring results to be consistent with the fluctuation of the influent concentration.

In this embodiment, the control of the differential pressure discharge valve 62 can be implemented at least in the following ways: first, the monitoring device sets a control system, and the control system is used to accept the preset opening and closing time, so as to control the differential pressure discharge through the control system The opening and closing of the valve 62 ; secondly, the opening and closing of the differential pressure discharge valve 62 is manually controlled by manually observing the reaction in the detection chamber 10 .

In order to obtain the liquid volume value V ₁ of the liquid to be tested, in some embodiments, by controlling the injection speed of the injection pump 22 and the closing time of the injection valve 23 , etc., the liquid to be tested entering the detection chamber 10 is controlled. The volume V ₁ is a preset volume; in some other embodiments, the monitoring device is further provided with a volume monitoring component, and the volume monitoring component is used to monitor the liquid level in the detection chamber 10 , and according to the liquid level height and the size of the detection chamber 10 , the volume V ₁ of the liquid to be tested in the detection chamber 10 is obtained by calculation; in some other embodiments, the volume V ₁ of the liquid to be tested is directly read by setting a scale line in the detection chamber 10 .

Preferably, the differential pressure guide tube 61 is an inverted U-shaped tube, the side wall of the detection chamber 10 is provided with an opening, and the first end of the inverted U-shaped tube extends into the detection chamber 10 through the opening; There is a sealed connection between them; the differential pressure discharge valve 62 is arranged on the pipe portion of the inverted U-shaped pipe outside the detection chamber 10 .

In this embodiment, in order to improve the calculation efficiency, the monitoring device is further provided with a processing module, which can calculate the hydrogen peroxide concentration according to the data of the liquid level meter 71, the data of the temperature detector 72 and the preset liquid level concentration equation. This embodiment also includes a PLC display terminal 80 for inputting preset values (a, b, R) and displaying various information.

Preferably, the detection chamber 10 is filled with a granular hydrogen peroxide decomposition catalyst to increase the contact area between the liquid to be tested and the catalyst, which is conducive to full decomposition and improves the pressure monitoring accuracy.

On the basis of the above structure, in order to prevent the loss of catalyst during sample discharge, the monitoring device further includes a filter screen, and the filter screen is arranged at the sample discharge port.

Preferably, the hydrogen peroxide splitting catalyst particles comprise manganese dioxide particles or the main component of the hydrogen peroxide splitting catalyst particles is manganese dioxide.

Preferably, the upper side wall of the detection chamber 10 is provided with an injection port, and the injection pipe 21 is connected with the injection port.

Preferably, in order to facilitate repeated sampling detection, the monitoring device further includes a flushing water tank 30, a flushing pipeline 31, a flushing pump 32 and a flushing valve 33; the flushing valve 33 is arranged in the flushing pipeline 31; the flushing water tank 30 is used for containing the flushing liquid, and the flushing pipeline The port at one end of 31 is located in the flushing liquid, and the other end of the flushing pipe 31 is connected to the detection chamber 10; the flushing pump 32 is used to provide power, so that when the flushing valve 33 is opened, the flushing liquid in the flushing water tank 30 is pumped through the flushing pipe 31 to In the detection chamber 10; in this way, when the detection in the detection chamber 10 is completed, in order to ensure the accuracy of the next detection data, the flushing liquid is pumped into the detection chamber 10 by the flushing pump 32, and the residual in the detection chamber 10 to be tested can be flushed. Liquid, after flushing, the liquid is discharged from the sample outlet.

In some embodiments, a flushing shower or spray head may also be provided to improve flushing effect.

In this embodiment, when the flushing valve 33, the sampling valve 23, the differential pressure discharge valve 62 and the sampling valve 43 are all closed, the detection chamber 10 is a gas-tight detection chamber 10.

As shown in FIG. 1 , in some embodiments, the sampling pipeline and the flushing pipeline are independent of each other, and the sampling pump 22 and the flushing pump 32 need to be provided separately.

As shown in FIG. 2 , in some other embodiments, in order to reduce costs or facilitate installation, the sampling pump 22 is shared with the flushing pump 32, which is the sampling flushing pump 50; the sampling flushing pump 50 has a water inlet and a water outlet; monitoring The device also includes a connecting dry pipe, one end of the sample introduction pipe 21 is connected with the reaction cell 90 to be tested, and the other end is connected with the connecting dry pipe; one end of the flushing pipe 31 is connected with the reaction cell 90 to be tested, and the other end is connected with the connecting dry pipe; The pipe is connected to the water inlet, and the water outlet is connected to the detection chamber 10 .

Preferably, in order to speed up the sampling efficiency, the monitoring device further comprises a sampling pipeline 41, a sampling valve 43 and a sampling pump 42, the sampling pipeline 41 is connected with the sampling opening, and the sampling valve 43 is arranged in the sampling pipeline 41; The sample pump 42 is used to provide power to discharge the liquid in the detection chamber 10 through the sample discharge pipeline 41 when the sample discharge valve 43 is opened.

Preferably, since the liquid to be tested only undergoes a decomposition reaction of hydrogen peroxide in the detection chamber 10, no other impurities are mixed in the liquid to be tested. The end of 41 away from the detection chamber 10 is set above the liquid to be tested, so as to send the liquid in the detection chamber 10 to the reaction cell 90 to be tested through the opening.

This embodiment controls all valves and pumps through the control system.

The above-mentioned embodiments are only the preferred embodiments of the present invention, and the scope of protection of the present invention cannot be limited by this. Any insubstantial changes and replacements made by those skilled in the art on the basis of the present invention belong to the scope of the present invention. The scope of protection of the utility model.

Claims (10)

1. Hydrogen peroxide solution concentration monitoring devices, its characterized in that:

comprises a sample introduction pipeline, a sample introduction valve, a detection chamber, a differential pressure guide pipe, a differential pressure drain valve, a liquid level meter and a temperature detector;

the sample injection pipeline is provided with the sample injection valve; the sample introduction pipeline is configured to be used for sending liquid to be detected in a reaction tank to be detected into the detection chamber when the sample introduction valve is opened; a hydrogen peroxide decomposition catalyst is arranged in the detection chamber and used for catalyzing the hydrogen peroxide in the detection chamber to perform decomposition reaction;

one end of the differential pressure guide pipe is inserted into the liquid to be detected in the detection chamber, the other end of the differential pressure guide pipe is positioned outside the detection chamber, the differential pressure guide pipe is provided with at least one pipe section which is higher than the liquid level of the liquid to be detected in the detection chamber, and the differential pressure liquid discharge valve is arranged on the differential pressure guide pipe; when the sampling valve and the differential pressure drain valve are both closed, the detection chamber is sealed into a gas-sealed detection chamber;

the differential pressure drainage valve is used for being opened when the internal air pressure in the air sealing detection chamber is higher than the external atmospheric pressure, so that liquid to be detected in the detection chamber flows out of the differential pressure drainage pipe under the action of the internal air pressure; the liquid level meter is used for detecting liquid level data of liquid to be detected in the detection chamber; the temperature detector is used for detecting the indoor temperature.

2. The hydrogen peroxide concentration monitoring device according to claim 1, wherein:

the differential pressure flow guide pipe is an inverted U-shaped pipe, an opening is formed in the side wall of the detection chamber, and the first end of the inverted U-shaped pipe extends into the detection chamber from the opening; the differential pressure drain valve is arranged on the pipe part of the inverted U-shaped pipe outside the detection chamber.

3. The hydrogen peroxide concentration monitoring device according to claim 1, wherein:

the liquid level meter is an ultrasonic liquid level meter.

4. The hydrogen peroxide concentration monitoring device according to claim 1, wherein:

still include the sampling pump, the sampling pump with the sampling pipe connects to the power that the liquid pump that awaits measuring in will await measuring the reaction tank was sent to the detection room.

5. The hydrogen peroxide concentration monitoring device according to claim 1, wherein:

the detection chamber is filled with granular hydrogen peroxide decomposition catalyst, and the hydrogen peroxide decomposition catalyst comprises manganese dioxide particles.

6. The hydrogen peroxide concentration monitoring device according to claim 1, wherein:

the device also comprises a filter screen; the detection chamber is provided with a sample discharge port for discharging liquid to be detected, and the filter screen is arranged at the sample discharge port.

7. The hydrogen peroxide concentration monitoring device according to claim 4, wherein:

the device also comprises a flushing water tank, a flushing pipeline, a flushing pump and a flushing valve; the flushing valve is arranged on the flushing pipeline; the flushing water tank is used for containing flushing liquid, and the flushing pipeline is used for communicating the flushing water tank with the detection chamber; the flushing pump is used for providing power so as to pump flushing liquid in the flushing water tank into the detection chamber through the flushing pipeline when the flushing valve is opened;

and when the flushing valve, the sampling valve and the differential pressure drain valve are all closed, the detection chamber is a gas sealing detection chamber.

8. The hydrogen peroxide concentration monitoring device according to claim 7, wherein:

the sample injection pump and the flushing pump are shared and are sample injection flushing pumps; the sample injection flushing pump is provided with a water inlet and a water outlet;

the monitoring device also comprises a connecting main pipe, one end of the sample introduction pipeline is connected with the reaction tank to be detected, and the other end of the sample introduction pipeline is connected with the connecting main pipe; one end of the flushing pipeline is connected with the reaction tank to be tested, and the other end of the flushing pipeline is connected with the connecting main pipe;

the connecting main pipe is connected with the water inlet, and the water outlet is connected with the detection chamber.

9. The hydrogen peroxide concentration monitoring device according to any one of claims 1 to 6, wherein:

the device also comprises a stock layout pipeline, a stock layout valve and a stock layout pump; the detection chamber is provided with a sample discharge port; the sample discharge pipeline is connected with the sample discharge port, and the sample discharge valve is arranged on the sample discharge pipeline; the stock pump is used for providing power so that when the stock valve is opened, liquid in the detection chamber is discharged through the stock pipeline.

10. The hydrogen peroxide concentration monitoring device according to claim 9, wherein:

still including the reaction tank that awaits measuring that is used for splendid attire liquid that awaits measuring, the reaction tank upside that awaits measuring is equipped with the opening, the stock layout pipeline is kept away from the one end of detecting the room is passed through the opening will liquid in the detecting chamber is delivered to the reaction tank that awaits measuring.

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