CN116223447A - Real-time monitoring method and device for marine organisms in nuclear power cooling water channel - Google Patents

Abstract

The invention discloses a method and a monitoring device for real-time monitoring of marine organisms in nuclear power cooling channels, comprising the following steps: arranging a plurality of monitoring points in the monitoring area, and the monitoring points are arranged in an array; obtaining monitoring data of each monitoring point in real time and flow data; according to the monitoring data, it is judged whether there are marine organisms in the monitoring area; when the presence of marine organisms is detected, the parameters of marine organisms are obtained through the monitoring data. There are monitoring points arranged in an array, and the monitoring data and flow data of the monitoring points are obtained in real time through the sensing device. Through data processing, the marine organisms with small volume and fast flow can be identified, and further To distinguish the types of marine organisms, the method and device of the present invention have a fast identification and response speed, and can be arranged in an array to collect data at the same time in a synchronous manner and accurately obtain parameters of marine organisms.

Description

A real-time monitoring method and monitoring device for marine organisms in nuclear power cooling channels

technical field

The invention relates to the technical field of nuclear power operation and maintenance safety, in particular to a method and a monitoring device for real-time monitoring of marine organisms in nuclear power cooling channels.

Background technique

Nuclear power plants are mainly distributed in coastal areas, and seawater is used as an important natural cooling medium during nuclear power operation. However, in addition to the required cooling liquid, natural seawater also contains a large number of marine organisms such as seaweed, tanks, fish and shrimp. When seawater is used as the cooling medium, excessive sea organisms can cause the blockage of the cooling circulation pipeline and cause a secondary verified cold source blockage accident, which poses a serious threat to the safe operation of the unit. At present, the method of assessing and monitoring marine biomass is to establish the relationship between the pulling force of the trash net and the amount of intercepted marine organisms, and then evaluate the biomass of marine organisms. However, this indirect measurement method based on a mechanical mechanism cannot accurately assess the number of marine organisms due to the influence of parameters such as the permeability of the trash net. Especially when a variety of marine organisms exist at the same time, the number of marine organisms cannot be extracted from the macroscopic tension monitoring results due to the differences in the permeability coefficients of different marine organisms.

"Nuclear power plant cold source water intake interception network state monitoring system and monitoring method CN113702981A", the monitoring object of the invention is the water intake interception network state, and the number of sea organisms in the cooling water is indirectly realized through the change of the interception net tension, rather than directly affecting the sea life in the water. Biomass measurements.

"An alarm device for monitoring the quantity of marine organisms at the water intake of a nuclear power plant CN213241425U", the monitoring location of this utility model is at the water intake, that is, before the cooling water enters the circulating water channel. Since the range of the water intake can usually reach hundreds of meters, the test range of the attached device cannot cover the entire monitoring area, so it is impossible to timely and effectively identify and give early warning when concentrated marine organisms appear.

"Intelligent detection method and system for marine organisms in cold source of nuclear power plant CN114299332A", the invention uses video images to extract the characteristics of marine organisms and to identify the number and type of marine organisms. This invention only proposes the use of intelligent algorithms for image recognition, but does not describe a specific method for recognizing image features of marine organisms. In addition, due to the turbidity and low visibility of the cooling seawater, the effective recognition distance of the video image method is relatively small.

At present, the slow response speed of the turbidity sensor results in a low sampling frequency, and the sea organisms and water flow in the channel are fast. If the optical signal changes cannot be captured in time when the sea organisms flow through the sensor, the sea organisms cannot be effectively identified. For marine organisms with small volume and fast flow speed, the existing technology cannot realize the identification of marine organisms, let alone distinguish the types of marine organisms. At the same time, according to the changes in the power of the main engine of the nuclear power plant and the demand for power generation, the flow rate of the cooling water in the backwashing channel is also constantly changing, and it is difficult to effectively identify marine organisms in the water flow under the dynamic flow rate.

Contents of the invention

In view of the above defects or deficiencies, the purpose of the present invention is to provide a real-time monitoring method and monitoring device for marine organisms in nuclear power cooling channels, which can effectively identify marine organisms in water flow at dynamic flow rates.

For achieving above object, technical scheme of the present invention is:

A method for real-time monitoring of marine organisms in nuclear power cooling channels, comprising the following steps:

arranging a plurality of monitoring points in the monitoring area, and the monitoring points are arranged in an array;

Real-time access to monitoring data and flow data of each monitoring point;

According to the monitoring data, it is judged whether there are marine organisms in the monitoring area; when the existence of marine organisms is detected, the parameters of marine organisms are obtained through the monitoring data.

The arrangement of multiple monitoring points in the monitoring area is as follows:

Multiple monitoring points are arranged in the direction of coastal water flow, and the monitoring points are arranged in a straight line, and each monitoring point is set at equal intervals.

The real-time acquisition of monitoring data at each monitoring point includes:

The monitoring point is provided with an optical sensor for testing the refractive index within a preset range;

Collect the refractive index and flow data of the monitoring point according to the preset time; the flow data includes: the flow velocity v (m/s), the depth h (m) of the monitoring point, and the width w (m) of the water channel;

According to flow velocity v(m/s), depth h(m), and width w(m), calculate the flow rate as V _w =v·h·w.

According to the monitoring data, it is judged whether there are marine organisms in the monitoring area; when the presence of marine organisms is detected, obtaining the parameters of marine organisms through the monitoring data specifically includes:

Compare the monitoring data of each monitoring point with the preset threshold value, when it is greater than the threshold value, there is marine life, otherwise there is no marine life;

When marine organisms exist, parameters of marine organisms are calculated according to monitoring data and flow data; wherein, the parameters of marine organisms include volume and/or density of marine organisms.

The monitoring data specifically include

Comparing the refractive index of each monitoring point with a preset threshold to obtain the amplitude s _i of the monitoring point, where the amplitude s _i represents the amplitude of the i-th measuring point;

According to the amplitude s _i and the flow rate V _w , calculate the sea life volume and sea life density:

sea biovolume

The density of marine organisms is η=V _b /V _w ;

Among them, n is the number of monitoring points, and d is the distance between n measuring points.

The refractive index of each monitoring point is compared with a preset threshold to obtain the amplitude s _i of the monitoring point, specifically:

The refractive index of each monitoring point is compared with a preset threshold, and when it is greater than the threshold, it is considered that there are marine organisms in the monitoring point, and the amplitude is defined as s _i =1, otherwise s _i =0.

A monitoring device, comprising: an anti-clogging fixed support fixedly installed on the inner wall of a water channel, a liftable array monitoring mechanism is installed in the middle of the anti-clogging fixed support, and the array monitoring mechanism is arranged in the same direction as seawater flow.

The array monitoring mechanism includes: a mounting bracket, a plurality of optical sensors arranged in a straight line on the mounting bracket, and flow meters and depth gauges are respectively arranged on both sides of the optical sensors.

The array monitoring mechanism also includes: a spoke-type anti-accumulation housing, the spoke-type anti-accumulation housing is connected to the anti-clogging fixed bracket, and the installation bracket, the optical sensor flow meter, and the depth gauge are arranged on the spoke-type anti-accumulation housing. In the anti-accumulation shell; the floating ball and the locking teeth of the installation bracket, the liquid level adjustment gear is installed on the anti-clogging fixed bracket, the locking teeth mesh with the liquid level adjustment gear, when the floating ball drives the installation bracket to move , the mounting bracket drives the optical sensor, flow meter and depth gauge to move vertically up and down.

The fixed brackets on both sides of the anti-blocking fixed bracket and the side wall are fixed to the windward side at an angle of 30° with the water flow direction in the direction facing the water.

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

The present invention provides a real-time monitoring method and monitoring device for marine organisms in nuclear power cooling water channels based on turbidity testing. Monitoring points arranged in an array are provided, and the monitoring data and flow data of the monitoring points are obtained in real time through the sensing device. Data processing can identify marine organisms with small volume and fast flow speed, and can further distinguish the types of marine organisms. The method and device in the present invention have fast identification and response speed, and the array arrangement can Data collection is performed at the same time in a synchronous manner to accurately obtain the parameters of marine organisms.

Description of drawings

Fig. 1 is a flow chart of the method for real-time monitoring of marine organisms in nuclear power cooling channels of the present invention;

Fig. 2 is a schematic diagram of the array arrangement of the present invention;

Fig. 3 is the structural diagram of monitoring device of the present invention;

Fig. 4 is a three-dimensional structure diagram of the monitoring device of the present invention;

Fig. 5 is a structural diagram of the liquid level adjustment gear of the monitoring device of the present invention;

Fig. 6 is an installation diagram of the monitoring device of the present invention.

In the figure, 1 flow meter; 2 depth gauge; 3 optical sensor; 4 anti-clogging fixed bracket; 5 liquid level adjustment gear; 6 power adapter; 7 data collector; ; 11 mounting bracket.

Detailed ways

The present invention will be described in detail below in conjunction with the accompanying drawings. Apparently, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

When seawater is used as the cooling medium to cool down the operating equipment of nuclear power plants, insufficient filtration of marine organisms often occurs, resulting in the fact that the existing technology cannot realize the identification of marine organisms, let alone distinguish marine organisms. creature type.

Embodiment one

In order to improve the identification rate of marine organisms, as shown in Figure 2, the present invention provides a method for real-time monitoring of marine organisms in nuclear power cooling channels, comprising the following steps:

S1. Arrange multiple monitoring points in the monitoring area, and the monitoring points are arranged in an array;

Along the seawater flow direction, multiple monitoring points are arranged in a straight line, and the monitoring range and sensitivity between each monitoring point are set at equal intervals, as shown in Figure 2. For example, in the center of the channel, along the seawater flow direction , arranging a plurality of monitoring points, and each monitoring device or sensor for monitoring is set electrically. In the present invention, an exemplary optical sensor is used, and the distance between each measuring point forming an arrayed optical sensor group is 1 cm. . Each optical sensor can test the refractive index of seawater at the target measuring point, and the refractive index will change significantly when the seawater flows through marine organisms; specifically, according to the sampling frequency, the optical sensor on each monitoring point synchronously collects the same moment The refractive index, and transmit the refractive index to the data collector for processing and saving. Exemplarily, 7 optical sensors are arranged, the distance between each optical sensor is 1 cm, the sampling frequency of each optical sensor is about 1 Hz, and the total length of monitoring is 7 cm. In the present invention, by adopting a plurality of sensor arrays, the problem that the sensor sampling frequency is low and cannot effectively capture small pieces of marine organisms can be avoided. According to the spacing of the sensors and the number of measuring points, the array optical sensor group can test the drifting sea creatures with a total length of 7 cm at the same time, and the test accuracy of the length of sea creatures can reach 1 cm. Since the marine organisms in the backwashing channel have been filtered by multiple traps, the length of the marine organisms in the channel is generally about 2 to 3 cm, and the length of the marine organisms in the channel can reach 5 cm. Therefore, the array sensor group can effectively identify the marine organisms and their sizes in the water channel.

S2. Obtain the monitoring data and flow data of each monitoring point in real time;

In order to effectively monitor the state and condition of marine organisms, in the present invention, the monitoring point collects data according to the real-time sampling;

specifically:

The real-time acquisition of monitoring data at each monitoring point includes:

The monitoring point is provided with an optical sensor for testing the refractive index within a preset range;

Collect the refractive index and flow data of the monitoring point according to the preset time; the flow data includes: the flow velocity v (m/s), the depth h (m) of the monitoring point, and the width w (m) of the water channel;

According to flow velocity v(m/s), depth h(m), and width w(m), calculate the flow rate as V _w =v·h·w.

An optical sensor is a sensor that measures based on optical principles. It has many advantages, such as non-contact and non-destructive measurement, almost no interference, high-speed transmission, and telemetry and remote control. It mainly includes general optical measuring instruments, laser interferometry, grating, encoder and optical sensors and instruments such as optical fiber. It is mainly designed to monitor the presence of objects, or to monitor the motion of various industries, automobiles, electronic products and retail automation.

In the water, when there are marine organisms, due to the occlusion of the marine organisms, after the monitoring light emitted by the optical sensor is blocked, the refraction angle of the light changes. In the present invention, the optical sensor mainly judges whether the marine organisms are There is, further, data such as the length of the sea creatures that have been measured.

S3. According to the monitoring data, it is judged whether there are marine organisms in the monitoring area; when the existence of marine organisms is detected, the parameters of marine organisms are obtained through the monitoring data.

According to the monitoring data, it is judged whether there are marine organisms in the monitoring area; when the presence of marine organisms is detected, obtaining the parameters of marine organisms through the monitoring data specifically includes:

Compare the monitoring data of each monitoring point with the preset threshold value, when it is greater than the threshold value, there is marine life, otherwise there is no marine life;

When marine organisms exist, parameters of marine organisms are calculated according to monitoring data and flow data; wherein, the parameters of marine organisms include volume and/or density of marine organisms.

3.1. Comparing the refractive index of each monitoring point with a preset threshold value to obtain the amplitude _si of the monitoring point, the amplitude _si represents the amplitude of the i-th measuring point; The refractive index is compared with the preset threshold to obtain the amplitude s _i of the monitoring point, specifically:

The refractive index of each monitoring point is compared with the preset threshold value, and when it is greater than the threshold value, it is considered that there are marine organisms in the monitoring point, and the amplitude is defined as si=1, otherwise si=0. Exemplarily, the array optical sensor has a total of n measuring points, and each measuring point is assigned a value of si, which represents the amplitude of the i-th measuring point. The data of each measuring point is divided into high and low. When the threshold is greater than 1000mg/L Then it is considered that there are marine organisms at the measuring point si=1, otherwise si=0, and the distance between n measuring points is d.

3.2. Calculate the volume and density of marine organisms according to the amplitude s _i and the flow rate V _w :

海生物密度为η＝V_b/V_w；sea biovolume

The density of marine organisms is η=V _b /V _w ;

Among them, n is the number of monitoring points, and d is the distance between n measuring points.

Exemplary:

Step1: Set a total of 5 monitoring points of the array optical sensor, record the refractive index of each monitoring point, and compare it with the preset threshold;

When in the monitoring points, s1=0, s2=1, s3=1, s4=1, s5=0, it means that the data of the 2nd, 3rd and 4th monitoring points are divided into high positions, and the distance between every 2 measuring points is 0.1cm.

Step2: According to the detected flow data: flow velocity 1 (m/s), depth 1 (m), width 1 (m), calculate the flow rate as V _w =v·h·w=1m ³ /s.

Step3: Calculate the volume of sea organisms from optical sensor data:

Step 4: The density of marine organisms is η=V _b /V _w =1.5/1=1.5kg/s.

The same detection method as above can accurately obtain the specific parameters of marine organisms.

Embodiment two

As shown in Figures 3 and 4, in order to implement the above-mentioned real-time monitoring method for marine organisms in nuclear power cooling water channels based on turbidity testing in the present invention, the present invention also provides a monitoring device, including: an anti-blocking fixed device fixedly installed on the inner wall of the water channel Bracket 4, a liftable array monitoring mechanism is installed in the middle of the anti-blocking fixed bracket 4, and the arrangement of the array monitoring mechanism is the same as that of seawater flow.

The array monitoring mechanism includes a plurality of optical sensors 3 arranged in a straight line, and the two sides of the optical sensors 3 are respectively provided with a flow meter 1 and a depth gauge 2 . The optical sensor 3, the velocity meter 1 and the depth gauge 2 are both connected to a power adapter 6 and a data collector 7 . An anti-clogging fixed bracket 4 is installed on the housing 8 , and the array monitoring mechanism is installed on the anti-clogged fixed bracket 4 through the liquid level adjustment gear 5 .

It should be noted that the array monitoring mechanism is set in a single-row structure and is located in the middle of the fluid, because the test is only a probability statistics. According to the characteristics of the flow field, the flow rate in the middle of the fluid is the fastest, and monitoring at this position is the most representative sex. Exemplarily, as shown in Figure 3, the array monitoring mechanism is set in a single-row structure, but it is not limited thereto, and multiple rows of array monitoring mechanisms can also be set according to requirements to form a multi-row array structure .

In the present invention, the flow meter 1 is an ultrasonic flow meter 1, and the ultrasonic flow meter is an instrument for measuring liquid flow in a circular pipe based on the principle of "speed difference method". It adopts advanced multi-pulse technology, signal digital processing technology and error correction technology, so that the flow meter can better adapt to the environment of the industrial site, and the measurement is more convenient, economical and accurate. Ultrasonic flowmeter is a non-contact instrument, it can measure the medium flow of large pipe diameter and can also be used for the measurement of medium that is not easy to touch and observe. Its measurement accuracy is very high, and the highest accuracy of ±0.5% can be achieved by the external clamping installation. Flow measurement of radioactive and flammable and explosive media. The depth meter 2 is an ultrasonic depth meter, or an ultrasonic depth meter, and the ultrasonic depth sounder is mainly composed of an ultrasonic transducer and a measurement and control device. The ultrasonic transducer is used for ultrasonic transmission and reception; the measurement and control device controls the instrument to transmit, receive and analyze and process the received data. The working principle of the ultrasonic depth sounder is designed according to the principle that the ultrasonic wave can propagate in a straight line at a uniform speed in a homogeneous medium, and is reflected when it encounters different medium surfaces. The ultrasonic depth sounder uses the water body as the ultrasonic medium. When measuring the depth, the ultrasonic transducer is placed in a certain position underwater. The depth from the transducer to the bottom of the water can be transmitted to the received signal according to the propagation speed of the ultrasonic wave in the water and the ultrasonic signal. The time interval is calculated.

As shown in Figure 5, anti-clogging fixed brackets 4 are vertically installed on both sides of the array monitoring mechanism; floating balls 10 and locking teeth are arranged on the anti-clogged fixed brackets 4, and liquid level is installed on the housing 8. The gear 5 is adjusted, and the locking teeth are meshed with the liquid level adjusting gear 5 . When the floating ball 10 drives the anti-clogging fixed bracket 4 to move, the anti-clogged fixed bracket 4 drives a plurality of optical sensors 3 to move.

Specifically, the array monitoring mechanism also includes: a spoke-type anti-accumulation housing 8, the spoke-type anti-accumulation housing 8 is connected to the anti-clogging fixed bracket 4, the mounting bracket 11, the optical sensor 3 flowmeter 1. And the depth gauge 2 is set in the spoke-type anti-accumulation housing 8; as shown in Figure 4, the mounting bracket 11 float 10 and locking teeth, the anti-clogging fixed bracket 4 is equipped with a liquid level adjustment gear 5, The locking teeth are meshed with the liquid level adjustment gear 5, and when the floating ball 10 drives the mounting bracket 11 to move, the mounting bracket 11 drives the optical sensor 3, the flow meter 1 and the depth gauge 2 to move vertically up and down.

As shown in FIG. 6 , the brackets on both sides of the anti-clogging fixed bracket 4 are fixed to the side walls in the direction facing the water with a windward surface at an angle of 30° to the direction of the water flow.

In the present invention, the height adjustment of the liquid level adjustment gear 5 can ensure the vertical height of the ultrasonic flow meter and the array optical sensor group, thereby meeting the testing requirements of different parts of the device. The ultrasonic depth gauge transmits the liquid level height data to the data collector. When the liquid level height changes by more than 2 cm, the command is sent to the liquid level adjustment gear through the controller, and then the vertical height of the upper part of the bracket is adjusted through the gear drive. Until the height difference between the ultrasonic flowmeter and the array optical sensor group at 1/2 of the liquid surface is less than 2 cm.

Specifically, the ultrasonic current meter is installed on the mounting bracket 11, and the measured water flow velocity will be used to calculate the seawater flow rate and the density of marine organisms. The use of ultrasonic flowmeters will avoid the blockage of sensors caused by marine organisms or garbage in traditional vane or resistance flowmeters. The velocity meter sensor needs to be placed at the center of the liquid surface to measure the velocity of seawater in the channel. The cross section of the channel is small and the seawater in the channel has a relatively obvious velocity gradient. The horizontal position of the current meter sensor should be close to the center of the channel so as to measure the fastest flow velocity in the channel.

The ultrasonic depth gauge is installed on the mounting bracket 11, and the measured liquid level height is used to calculate the seawater flow rate and sea life density. The depth gauge sensor should be placed at the bottom of the channel in the vertical direction, so as to avoid the influence of liquid level changes on the test accuracy. The depth gauge sensor should be placed close to the edge of the pool in the horizontal direction to avoid the impact of excessive flow velocity or sea creature flow on the sensor test content. The sensor probe of the ultrasonic depth gauge adopts an embedded arc design. When sea creatures or marine garbage flow through the designed arc structure, they will not be blocked or attached due to the edges and corners of the sensor, thereby reducing the maintenance cost of long-term monitoring.

The array optical sensor group is installed on the mounting bracket 11, and consists of 7 optical sensor measuring points arranged in a straight line along the direction of the water flow. The distance between each measuring point forming the array optical sensor group is 1 cm. Each optical sensor can test the refractive index of seawater at the target measuring point, and the refractive index will change obviously when the seawater flows through sea creatures. The sampling frequency of each sensor is about 1 second, and the seven sensors collect data at the same time in a synchronous manner, and transmit the data to the data collector. The use of multiple sensor arrays can avoid the problem that the sensor sampling frequency is low and cannot effectively capture small pieces of marine organisms. According to the spacing of the sensors and the number of measuring points, the array optical sensor group can test the drifting sea creatures with a total length of 7 cm at the same time, and the test accuracy of the length of sea creatures can reach 1 cm. Since the marine organisms in the backwashing channel have been filtered by multiple traps, the length of the marine organisms in the channel is generally about 2 to 3 cm, and the length of the marine organisms in the channel can reach 5 cm. Therefore, the arrayed optical sensor group can effectively identify the marine life and its size in the water channel.

Preferably, as shown in Figure 5, the fixed brackets (9) and the side walls on both sides of the anti-blocking fixed bracket 4 are fixed on the side wall of the water channel by fastening bolts, and an ultrasonic flow meter and an ultrasonic depth gauge are installed on the mounting bracket 11. and arrayed optical sensor group and other components. The brackets on which the side walls are fixed are designed on the windward side at an angle of 30° to the water flow direction for the two pillars facing the water. When the marine organisms flow through the pillars, they will flow along the inclined plane design and will not be formed by scratches and other phenomena. Build up clogs.

In the present invention, the monitoring device as a whole has IP67 waterproof and dustproof performance, and at the same time, the device shell is made of 316L and plastic steel material with good corrosion resistance. The device can automatically capture the height of the liquid level and adjust the height of the sensor to the center of the liquid level. The anti-clogging design can prevent the sensor probe from being blocked by pollutants during the long-term monitoring process and affect the test. The spoke-type anti-clogging housing 8 is installed on the anti-clogging fixed bracket 4 and surrounds the outer side of the ultrasonic flowmeter and the array optical sensor group. Since the sensor parts of the ultrasonic current meter and the array optical sensor group are cylindrical, it is easy to form the accumulation of marine organisms when placed in the water channel, causing the water channel to be blocked, which seriously affects the monitoring effect and the normal operation of the water channel. The spoke-type anti-clogging housing 8 surrounds the ultrasonic flowmeter and the array optical sensor group, and adopts a crawler-type design that can be driven by the water flow for transmission. Drain after transport to the downstream, so as to avoid the clogging of the drain.

The technical problem mainly solved by the monitoring device of the present invention:

1) It can measure the turbidity changes caused by the passage of marine organisms in the channel;

2) According to the parameters such as turbidity change, flow velocity and flow rate, the density of sea creatures flowing through can be calculated;

3) The pollutants can be automatically cleaned by the flow of seawater in the channel to prevent the sensor surface from being blocked.

For those skilled in the art, it is obvious that the above-mentioned specific examples are only preferred solutions of the present invention, so those skilled in the art may make improvements and changes to some parts of the present invention, which still reflect the present invention. The principle of the present invention is still the object of the present invention, and all belong to the protection scope of the present invention.

Claims (10)

1. The marine organism real-time monitoring method in the nuclear power cooling ditch is characterized by comprising the following steps of:

arranging a plurality of monitoring points in a monitoring area, wherein the monitoring points are arranged in an array;

acquiring monitoring data and flow data of each monitoring point in real time;

judging whether marine organisms exist in the monitoring area according to the monitoring data; when the existence of the marine organism is detected, the marine organism parameters are acquired through the monitoring data.

2. The method for monitoring marine life in a nuclear power cooling ditch in real time according to claim 1, wherein the arrangement of a plurality of monitoring points for a monitoring area is specifically as follows:

the coastal water flows to and arranges a plurality of monitoring points, and a plurality of monitoring points are in the straight line arrangement, equidistant setting between every monitoring point.

3. The method for monitoring marine life in a nuclear power cooling water channel in real time according to claim 1 or 2, wherein the acquiring monitoring data of each monitoring point in real time comprises:

an optical sensor for testing refractive index in a preset range is arranged at the monitoring point;

collecting the refractive index and flow data of the monitoring point according to preset time; the flow data includes: the flow velocity v (m/s), the depth h (m) and the width w (m) of the canal of the monitoring point;

calculating the flow rate V according to the flow velocity V (m/s), the depth h (m) and the width w (m) _w ＝v·h·w。

4. The method for monitoring marine life in a nuclear power cooling ditch according to claim 1, wherein the method is characterized in that whether marine life exists in the monitoring area is judged according to the monitoring data; when the existence of the marine organism is detected, the marine organism parameters are acquired through monitoring data, and the method specifically comprises the following steps:

comparing the monitoring data of each monitoring point with a preset threshold value, if the monitoring data is larger than the threshold value, the marine creature exists, otherwise, the marine creature does not exist;

when marine organisms exist, calculating parameters of the marine organisms according to the monitoring data and the flow data; wherein the parameters of the marine organism include volume and/or marine organism density.

5. The method for monitoring marine life in a nuclear power cooling ditch according to claim 4, wherein the monitoring data specifically comprises:

comparing the refractive index of each monitoring point with a preset threshold value to obtain the amplitude s of the monitoring point _i Amplitude s _i Representing the amplitude of the ith measuring point;

according to amplitude s _i And flow V _w Calculating the sea volume and sea biological density:

sea creature volume

Sea biological density of η=v _b /V _w ；

Wherein n is the number of monitoring points, and d is the interval between n measuring points.

6. The method for real-time monitoring marine life in nuclear power cooling water channel according to claim 5, wherein the refractive index of each monitoring point is compared with a preset threshold value to obtain the monitoring pointIs of the amplitude s of (2) _i The method specifically comprises the following steps:

comparing the refractive index of each monitoring point with a preset threshold value, and when the refractive index is larger than the threshold value, considering that the monitoring point has marine organisms, and defining the amplitude as s _i =1, otherwise s _i ＝0。

7. A monitoring device, comprising: the anti-blocking fixing support (4) is fixedly arranged on the inner wall of the ditch, an array type monitoring mechanism capable of ascending and descending is arranged in the middle of the anti-blocking fixing support (4), and the arrangement of the array type monitoring mechanism is identical to the flow direction of seawater.

8. The monitoring device of claim 7, wherein the array monitoring mechanism comprises: the optical sensor comprises a mounting bracket (11), a plurality of optical sensors (3) which are linearly arranged on the mounting bracket (11), and a flowmeter (1) and a depth gauge (2) which are respectively arranged on two sides of each optical sensor (3).

9. The monitoring device of claim 8, wherein the array monitoring mechanism further comprises: the spoke type anti-accumulation shell (8), the spoke type anti-accumulation shell (8) is connected with the anti-blocking fixed support (4), and the mounting support (11), the optical sensor (3) flowmeter (1) and the depth gauge (2) are arranged in the spoke type anti-accumulation shell (8); the anti-blocking device is characterized in that the mounting support (11) is provided with a floating ball (10) and a latch, the anti-blocking fixing support (4) is provided with a liquid level adjusting gear (5), the latch is meshed with the liquid level adjusting gear (5), and when the floating ball (10) drives the mounting support (11) to move, the mounting support (11) drives the optical sensor (3), the flowmeter (1) and the depth gauge (2) to vertically move up and down.

10. The monitoring device according to claim 9, characterized in that the brackets (9) on both sides of the anti-clogging bracket (4) are fixed to the side walls with a windward side at an angle of 30 ° to the water flow direction in the water-ward direction.

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