Integrated monitoring pipeline system and balance control method thereof

Abstract

The invention provides an integrated monitoring pipeline system and a balance control method thereof. The integrated monitoring pipeline system comprises a plurality of sampling branches, a gathering pipeline, an electromagnetic valve, a throttling orifice plate, a large-curvature bent pipe and an airborne radioactivity integrated monitoring device. In the plurality of sampling branches, each branch is connected to a sampling point of a to-be-monitored area; the gathering pipeline is respectively connected with each sampling branch through a Y-shaped tee joint; the electromagnetic valve is arranged at the upstream of each sampling branch and is used for controlling the on-off of each sampling branch; the throttling orifice plates are arranged in the sampling branches, and the opening sizes of the throttling orifice plates are calculated and determined according to the resistance of the sampling branches; in the large-curvature bent pipe, the curvature radius is greater than or equal to five times of the outer diameter of the pipeline; and the airborne radioactivity integrated monitoring device is connected to the tail end of the gathering pipeline. According to the technical scheme, the resistance matching function is achieved, meanwhile, occupied resources can be reduced, and economical efficiency is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of radiation protection, and particularly relates to an integrated monitoring pipeline system and an equilibrium control method thereof. Background Art

[0002] The primary circuit pressure boundary of an ocean power platform consists of equipment such as a reactor, a steam generator (primary side), a pressurizer, a main coolant pump, etc., and the pipe systems between them. If the integrity of the primary circuit pressure boundary is damaged, the fission products and corrosion activation products leaked from the coolant will form aerosols in the containment air, and the leaked radioactive inert gases, iodine, etc. will also mix into the air, causing radioactive contamination of the air. These airborne radioactive substances may also spread to other rooms through penetrations, ventilation ducts, etc., posing a radiation threat of external irradiation and internal irradiation to personnel. Therefore, airborne radioactive monitoring should be carried out in the rooms where personnel stay for a long time or at positions where airborne radioactive leakage may occur, such as the fresh air inlet of the control room, the ventilation ducts of the rooms, and the areas with dense penetrations, etc., to monitor whether the airborne radioactivity exceeds the limit and ensure the radiation safety of personnel.

[0003] Currently, in nuclear power, a multi-branch scanning air duct monitoring device is generally used to monitor the airborne radioactive level in the air. With this measurement method, by taking airborne samples from different plants, the airborne radioactive levels in different plants can be understood when using one airborne radioactive integrated device. Since the distances from the sampling branches of each plant to the airborne radioactive integrated device are different, in order to ensure the resistance matching of each branch, a regulating valve is generally used for flow regulation, and 8 - 9 regulating valves are required for the entire monitoring channel. At the same time, solenoid valves are also installed in each branch to switch each branch, and the number of valves is relatively large, occupying a relatively large amount of resources.

[0004] Therefore, how to provide an integrated monitoring pipeline system and an equilibrium control method thereof, which can reduce the occupied resources and improve the economy while realizing the function of resistance matching, has become an urgent technical problem to be solved. Summary of the Invention

[0005] An embodiment of the present invention provides an integrated monitoring pipeline system and an equilibrium control method thereof, which can reduce the occupied resources and improve the economy while realizing the function of resistance matching.

[0006] In one embodiment of the present invention, an integrated monitoring pipeline system is provided, including: a plurality of sampling branches 1 - 8, a collecting pipeline 25 - 32, solenoid valves 9 - 16, orifice plates 17 - 24, large curvature elbows 25, 32, and an airborne radioactive integrated monitoring device.

[0007] Among the plurality of sampling branches 1 - 8, each branch is connected to a sampling point in the area to be monitored;

[0008] The collecting pipeline 25 - 32 is respectively connected to each sampling branch through a Y-shaped tee 26 - 31;

[0009] The solenoid valves 9 - 16 are arranged upstream of each sampling branch for controlling the on / off of each sampling branch;

[0010] The orifice plates 17 - 24 are arranged in each sampling branch, and the orifice size is determined according to the resistance calculation of each sampling branch;

[0011] For the large curvature elbows 25, 32, the radius of curvature ≥ 5 times the outer diameter of the pipeline;

[0012] The airborne radioactive integrated monitoring devices 33, 35 are connected to the end of the collecting pipeline;

[0013] Among them, the orifice size of the orifice plates 17 - 24 satisfies: ΔP i throttle = ΔP max -ΔP i where ΔP max is the maximum resistance value of all branches, and ΔP i is the resistance of branch i without the orifice plate.

[0014] Furthermore, the branch angle of the Y-shaped tees 26 - 31 is 30° - 60°, the inner wall radius of curvature ≥ 5 times the outer diameter of the pipeline, and the connection direction of the Y-shaped tees 26 - 31 is arranged at an acute angle to the air flow direction.

[0015] Furthermore, the orifice size of the orifice plates 17 - 24 is determined by the following formula:

[0016]

[0017] Among them, W is the mass flow rate, d0 is the orifice diameter, D is the pipeline inner diameter, M is the gas molecular weight, Z is the compressibility factor, k is the adiabatic index, P 前 is the pressure value before the orifice plate, and P 后 is the pressure value after the orifice plate.

[0018] Furthermore, the solenoid valves 9 - 16 adopt a timing control method. When radioactive anomalies are detected, the host computer cyclically opens and closes the solenoid valves of each branch in a preset order, and only one branch is opened at a time for area positioning.

[0019] Furthermore, the system further includes: an intelligent control module;

[0020] When specific radionuclides are detected, the solenoid valve inspection sequence is automatically optimized to preferentially scan the branches in high-risk areas.

[0021] Further, the large - curvature elbows 25 and 32 adopt a gradually changing curvature design, and the radius of curvature R satisfies: R = 5D; the surface roughness Ra of the Y - shaped tees 26 - 31 is ≤0.8 μm; the inclination angle of the pipeline is controlled within 3° - 5°, where v is the flow velocity in m / s.

[0022] In another embodiment of the present invention, an equilibrium control method for an integrated monitoring pipeline system, based on the integrated monitoring pipeline system described in any one of the above, the method includes:

[0023] a) Measuring the original resistance ΔP of each branch i ;

[0024] b) Determining the maximum resistance ΔP max = max(ΔP1...ΔP8);

[0025] c) Calculating the resistance ΔP to be compensated for each branch i节流 = ΔP max -ΔP i ;

[0026] d) Iteratively calculating the orifice diameter d0 of the orifice plate according to the throttling value of ΔP i until the measured flow error of the branch is ≤5%.

[0027] In another embodiment of the present invention, by means of computational simulation, a mapping relationship database between the orifice diameter of the orifice plate and the resistance compensation value is established to determine the final orifice size.

[0028] The beneficial effects brought by the present invention are as follows:

[0029] As can be seen from the above solution, the embodiment of the present invention provides an integrated monitoring pipeline system and its equilibrium control method, including: a plurality of sampling branches 1 - 8, a collecting pipeline 25 - 32, solenoid valves 9 - 16, orifice plates 17 - 24, large - curvature elbows 25, 32, and an airborne radioactive integrated monitoring device. Among the plurality of sampling branches 1 - 8, each branch is connected to a sampling point in the area to be monitored; the collecting pipeline 25 - 32 is respectively connected to each sampling branch through Y - shaped tees 26 - 31; the solenoid valves 9 - 16 are arranged upstream of each sampling branch for controlling the on - off of each sampling branch; the orifice plates 17 - 24 are arranged in each sampling branch, and their orifice sizes are determined according to the resistance of each sampling branch; in the large - curvature elbows 25, 32, the radius of curvature is ≥5 times the outer diameter of the pipeline; the airborne radioactive integrated monitoring device is connected to the end of the collecting pipeline. The technical solution of the present invention can reduce the occupied resources and improve the economy while realizing the function of resistance matching. Description of the Drawings

[0030] Figure 1 It is a schematic diagram of an integrated monitoring pipeline system according to an embodiment of the present invention;

[0031] In the figure, 1-8 are the pipeline parts at the inlet of each branch; 9-16 are solenoid valves; 17-24 are orifice plates; 25 and 32 are large-curvature elbows; 26-31 are Y-shaped tees. The pipelines between 25-26, 26-27, 27-28, 28-29, 29-30, 30-31, 31-32 and 33, 35 are summary pipelines. Specific embodiments

[0032] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0033] As Figure 1 shown, Figure 1 This is a schematic diagram of an integrated monitoring pipeline system according to an embodiment of the present invention.

[0034] Figure 1 In , an integrated monitoring pipeline system includes: a plurality of sampling branches 1-8, a summary pipeline 25-32, solenoid valves 9-16, orifice plates 17-24, large-curvature elbows 25, 32, and an airborne radioactivity integrated monitoring device.

[0035] Among the plurality of sampling branches 1-8, each branch is connected to a sampling point in the area to be monitored;

[0036] The summary pipeline 25-32 is respectively connected to each sampling branch through Y-shaped tees 26-31;

[0037] The solenoid valves 9-16 are arranged upstream of each sampling branch and are used to control the on-off of each sampling branch;

[0038] The orifice plates 17-24 are arranged in each sampling branch, and the opening size thereof is determined according to the resistance of each sampling branch;

[0039] For the large-curvature elbows 25, 32, the radius of curvature ≥ 5 times the outer diameter of the pipeline;

[0040] The airborne radioactivity integrated monitoring devices 33, 35 are connected to the end of the summary pipeline;

[0041] Among them, the opening size of the orifice plate 17-24 satisfies: ΔP i throttle = ΔP max -ΔP i where ΔP max is the maximum resistance value of all branches, and ΔPi is the resistance of branch i without an orifice plate.

[0042] In the embodiments of the present invention, sampling branches 1-8 are connected to the monitoring areas (such as the fresh air inlet of the control room and the area with dense penetrations), and each branch is configured; the orifice sizes of orifice plates 17-24 are dynamically calculated according to the formula to ensure the balanced resistance of each branch. The radius of curvature of large-curvature elbows 25 and 32 is ≥5D. The airborne radioactivity integrated monitoring device is respectively connected to the end of the summary pipeline to analyze gas samples in real time.

[0043] In the embodiments of the present invention, the integrated airborne radioactivity monitoring pipeline can perform multi-branch sampling on the air in different areas, reducing the occupied resources. Flow orifice plate resistance components are provided in each branch to ensure that the resistances of each branch are similar, and to ensure that the airborne sampling flow rates and sampling amounts from each area are similar.

[0044] In one embodiment of the present invention, the branch angle of the Y-shaped tees 26-31 is 30°-60°, the inner wall radius of curvature is ≥3 times the pipeline inner diameter, and the connection direction of the Y-shaped tees 26-31 is arranged at an acute angle to the air flow direction. In addition, the Y-shaped tees are arranged at an acute angle and coated with polytetrafluoroethylene, and the large-curvature elbows adopt a gradually changing curvature design (R = 5D + 0.2v), which can reduce the aerosol deposition rate by 60% and extend the maintenance period by more than 3 times.

[0045] In another embodiment of the present invention, the orifice sizes of the orifice plates 17-24 are determined by the following formula:

[0046]

[0047] where W is the mass flow rate, d0 is the orifice diameter, D is the pipeline inner diameter, M is the gas molecular weight, Z is the compressibility factor, k is the adiabatic index, P 前 is the pressure value before the orifice plate, and P 后 is the pressure value after the orifice plate.

[0048] In another embodiment of the present invention, the solenoid valves 9-16 adopt a timing control method. When radioactive anomalies are detected, the host computer cyclically opens and closes the solenoid valves of each branch in a preset order, and only one branch is opened at a time for area positioning.

[0049] In another embodiment of the present invention, the system further includes: an intelligent control module;

[0050] When specific radionuclides are detected, the solenoid valve inspection sequence is automatically optimized, and the branches in high-risk areas are scanned preferentially.

[0051] In another embodiment of the present invention, the large-curvature elbows 25 and 32 adopt a gradually changing curvature design, and the radius of curvature R satisfies: R = 5D; the surface roughness Ra of the Y-shaped tees 26-31 is ≤ 0.8 μm; the pipeline inclination angle is controlled within 3°-5°.

[0052] In another embodiment of the present invention, an equilibrium control method for an integrated monitoring pipeline system is based on the integrated monitoring pipeline system described in any one of the above, and the method includes:

[0053] a) Measuring the original resistance ΔP of each branch i ;

[0054] b) Determining the maximum resistance ΔP max = max(ΔP1...ΔP8);

[0055] c) Calculating the resistance ΔP to be compensated for each branch i节流 = ΔP max -ΔP i ;

[0056] d) Iteratively calculating the opening diameter d0 of the orifice plate according to ΔP i until the measured flow error of the branch is ≤ 5%.

[0057] In another embodiment of the present invention, a mapping relationship database between the orifice plate opening diameter and the resistance compensation value is established by combining CFD simulation and actual test, and the final opening size is determined by interpolation.

[0058] Figure 1 In, an integrated airborne radioactive monitoring pipeline with resistance matching includes each sampling branch (pipelines between 1-8 and 9-17, 10-18, 11-19, 12-20, 13-21, 14-22, 15-23, 16-24, 17-25, 18-26, 19-27, 20-28, 21-29, 22-30, 23-31, 24-32), solenoid valves (9-16, 34, 36), orifice plates (17-24), elbows (25, 32), Y-shaped tees (26-31), sampling aggregation pipes (pipelines between 25-26, 26-27, 27-28, 28-29, 29-30, 30-31, 31-32 and 33, 35).

[0059] Each sampling branch (the pipeline between 1-8 and 9-17, 10-18, 11-19, 12-20, 13-21, 14-22, 15-23, 16-24, 17-25, 18-26, 19-27, 20-28, 21-29, 22-30, 23-31, 24-32), characterized in that: sampling is carried out at typical positions (entrance of area 1 - entrance of area 8) in the room to be monitored, and the sampled gas is sent to the sampling manifold of the integrated airborne radioactivity monitoring pipeline (the pipeline between 25-26, 26-27, 27-28, 28-29, 29-30, 30-31, 31-32 and 33, 35). The design of the sampling pipeline needs to be determined according to the room where airborne radioactivity monitoring is carried out and the installation position of the integrated airborne radioactivity monitoring device. The overall design principle is to minimize the length of the sampling pipeline, especially the horizontal pipeline.

[0060] Orifice plate (17-24), characterized in that: the opening size is designed according to the length of each sampling branch to ensure the resistance balance of each branch. The method for determining the opening size is as follows:

[0061] 1) Sort out the length of all horizontal pipelines, vertical pipelines, elbows, tees, the number of solenoid valves, etc. of each branch according to the format of Table 1.

[0062] 2) Calculate the resistance that the orifice plate of each branch needs to provide.

[0063] (1) To ensure that the sampling volume of each area is equal, the flow rate of each branch needs to be the same. Here, it is assumed that there are 8 branches, and the flow rate of each branch is equal and is 1 / 8 of the rated flow rate of the integrated airborne radioactivity monitoring device. Under this assumption, calculate the frictional resistance caused by each section of the pipeline of each branch and the local resistance caused by each component such as valves and tees. For the i-th branch, the frictional resistances are ΔP i沿1 、ΔP i沿2 ……, and the local resistances are ΔP i局部1 、ΔP i局部2 ……, and add up the total resistances to obtain ΔP i =ΔP i沿程1 +ΔP i沿程2 +...ΔP i局部1 +ΔP i局部2 +...。

[0064] Table 1

[0065]

[0066] (2) After calculating the total resistances of the 8 branches respectively, find the maximum resistance value ΔP max =max(ΔP1, ΔP2...ΔP8).

[0067] (3) According to the maximum resistance ΔP max and the resistance ΔP of each branch i , calculate the resistance ΔP that the orifice plate of each branch needs to provide i节流 = ΔP max - ΔP i .

[0068] 3) Calculate the orifice size of the orifice plate.

[0069] The orifice size calculation formula of the orifice plate is as follows:

[0070]

[0071] Taking the first branch as an example, before the orifice plate, there are pipeline 1, the pipeline between 9 - 17, and solenoid valve 9, then the pressure before the orifice plate is:

[0072] P 前 = ΔP 10 - ΔP 1沿程1 - ΔP 1沿程2 - ΔP 1局部1

[0073] Among them, P 前 is the pressure before the orifice plate, ΔP 10 is the pressure at the inlet of the pipeline of the first branch, ΔP 1沿程1 , ΔP 1沿程2 are the frictional resistances generated by pipeline 1 and the pipeline between 9 - 17 respectively, and ΔP 1局部1 is the local resistance generated by solenoid valve 9.

[0074] The pressure after the orifice plate is:

[0075] P 后 = P 前 - ΔP 1节流

[0076] According to the calculated P 前、 P 后 , and referring to other required data, the orifice size of the first branch can be calculated.

[0077] The solenoid valve (9 - 16) is characterized in that: during the monitoring process of the airborne radioactive integrated monitoring device, when radioactive anomalies are detected, the upper computer of the radiation monitoring system issues a "patrol inspection" command, sequentially opens and closes valves 9 - 16, and performs cyclic scanning on different areas to determine the area where radioactive anomalies occur.

[0078] The solenoid valve (9-16) described above is characterized in that during the monitoring process of the airborne radioactive integrated monitoring device, when radioactive anomalies are detected, the upper computer of the radiation monitoring system issues a "patrol inspection" command to sequentially open and close the valve 9-16 to perform a cyclic scan of different areas, thereby determining the area where the radioactive anomalies occur.

[0079] The elbows (25, 32) described above are characterized in that elbows with a curvature radius ≥ 5 times the inner diameter of the pipeline are selected to reduce the deposition of aerosols and iodine in the pipeline.

[0080] The Y-shaped three-way joints (26-31) described above are characterized in that non-right-angle three-way joints are selected to reduce the deposition of aerosols and iodine in the pipeline.

[0081] The collecting pipe (pipelines between 25-26, 26-27, 27-28, 28-29, 29-30, 30-31, 31-32) is used to collect the airborne radioactive substances of each branch and transmit the airborne radioactive substances to the collecting pipe 33 and send them to the airborne radioactive substance device for monitoring. During the monitoring process of the airborne radioactive integrated monitoring device, when radioactive anomalies are detected, the upper computer of the radiation monitoring system issues a "patrol inspection" command, and the valves 9-16 of each branch are sequentially opened and closed to perform a cyclic scan of different areas, thereby determining the area where the radioactive anomalies occur.

[0082] An embodiment of the present invention provides an integrated monitoring pipeline system and its balanced control method, including: a plurality of sampling branches 1-8, a collecting pipeline 25-32, solenoid valves 9-16, orifice plates 17-24, elbows with large curvature 25, 32, and an airborne radioactive integrated monitoring device 33, 35. Among the plurality of sampling branches 1-8, each branch is connected to a sampling point in the area to be monitored; the collecting pipeline 25-32 is respectively connected to each sampling branch through a Y-shaped three-way joint 26-31; the solenoid valves 9-16 are arranged upstream of each sampling branch to control the on / off of each sampling branch; the orifice plates 17-24 are arranged in each sampling branch, and the opening size thereof is determined according to the resistance calculation of each sampling branch; in the elbows with large curvature 25, 32, the curvature radius ≥ 5 times the inner and outer diameters of the pipeline; the airborne radioactive integrated monitoring device is connected to the end of the collecting pipeline. The technical solution of the present invention can reduce the occupied resources and improve the economy while realizing the function of resistance matching.

[0083] The above are the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. An integrated monitoring pipeline system, characterized in that: The integrated monitoring pipeline system comprises: a plurality of sampling branches (1-8), a collection pipeline (25-32), a solenoid valve (9-16), a throttling orifice plate (17-24), a large curvature elbow (25, 32) and an integrated airborne radioactivity monitoring device; Each of the plurality of sampling branches (1-8) is connected to a sampling point of the area to be monitored; The collecting pipeline (25-32) is connected to each sampling branch through a Y-shaped tee (26-31); The solenoid valves (9-16) are arranged upstream of each sampling branch and are used to control the on-off of each sampling branch; The throttling orifice plates (17-24) are arranged in each sampling branch, and the opening size thereof is determined by calculation based on the resistance of each sampling branch; In the large curvature curved pipe (25, 32), the curvature radius is ≥ 5 times the outer diameter of the pipe; The airborne radioactivity integrated monitoring device is connected to the end of the collecting pipeline; Wherein, the opening size of the throttling orifice plate satisfies: ΔP i Throttling = ΔP max -ΔP i , ΔP max is the maximum resistance value of all branches, ΔP i is the resistance of branch i when no throttling orifice is added.

2. An integrated monitoring pipeline system according to claim 1, characterized in that: The branch angle of the Y-shaped tee (26-31) is 30°-60°, the inner wall curvature radius is ≥5 times the outer diameter of the pipeline, and the connection direction of the Y-shaped tee (26-31) is arranged at an acute angle to the airflow direction.

3. The integrated monitoring pipeline system according to claim 1, characterized in that: The opening size of the throttling orifice plate (17-24) is determined by the following formula: Where W is the weight flow rate, d0 is the orifice diameter, D is the inner diameter of the pipe, M is the gas molecular weight, Z is the compressibility coefficient, k is the adiabatic index, and P 前 is the pressure before the throttling orifice plate, P 后 is the pressure value after the throttling orifice.

4. The integrated monitoring pipeline system according to claim 1, characterized in that: The solenoid valves (9-16) adopt a timing control method. When radioactive anomalies are detected, the host computer cyclically opens and closes the solenoid valves of each branch in a preset sequence, and only opens one branch at a time to perform regional positioning.

5. The integrated monitoring pipeline system according to claim 1, characterized in that: The system further comprises: an intelligent control module; The intelligent control module is used to automatically optimize the inspection sequence of the solenoid valves and give priority to scanning branches in high-risk areas when specific radioactive nuclides are detected.

6. The integrated monitoring pipeline system according to claim 1, characterized in that: The large curvature elbow (25, 32) adopts a gradual curvature design, and the curvature radius R satisfies: R=5D; the surface roughness Ra of the Y-shaped tee (26-31) is ≤0.8 μm; and the pipeline inclination angle is controlled at 3°-5°.

7. A method for controlling a balanced integrated monitoring pipeline system, based on the integrated monitoring pipeline system according to any one of claims 1 to 6, characterized in that: The method comprises: a) Measure the original resistance ΔP of each branch i ; b) Determine the maximum resistance ΔP max =max(ΔP1...ΔP8); c) Calculate the resistance ΔP required to compensate for each branch i节流 =ΔP max -ΔP i ; d) According to ΔP i The throttling value is iteratively calculated to obtain the throttling orifice plate opening diameter d0 until the error of the measured branch flow is ≤5%.

8. The method for controlling the balance of an integrated monitoring pipeline system according to claim 7, characterized in that: By means of simulation calculation, a database of mapping relationship between orifice plate opening diameter and resistance compensation value is established to determine the final opening size.

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