High-temperature gas cooled reactor anti-seismic cable bridge and support hanger integrated system for nuclear island

Abstract

The invention relates to the technical field of anti-seismic cable bridges and high temperature resistance, and discloses a high-temperature gas cooled reactor anti-seismic cable bridge and support hanger integrated system for a nuclear island, which comprises a bridge body, a support hanger system and an integrated control unit, the inner layer is a silicon carbide fiber reinforced layer, and the support hanger system comprises a dynamic damping device and a self-locking connecting piece. Through the synergistic effect of the dynamic damping device and the self-locking type connecting piece, the shock resistance of the system under the extreme working condition is remarkably improved, the magnetorheological fluid damper is designed based on a Bingham fluid model, the damping force formula is utilized, and it is ensured that the vibration acceleration peak value of equipment is reduced to 0.3 g from 0.8 g and the residual deformation is smaller than or equal to 5 mm at the earthquake acceleration of 0.15 g. According to the self-locking type connecting piece, through the design that the wedge angle theta is equal to 45 degrees, it is ensured that the locking force reaches 1500 N when the normal force is 5000 N through a locking force formula, loosening does not occur in the vibration process, and excellent anti-seismic performance and structural safety are achieved.

Description

Technical Field

[0001] This invention relates to the field of seismic-resistant cable trays and high-temperature resistant technology, specifically to an integrated system of seismic-resistant cable trays and supports for high-temperature gas-cooled reactors used in nuclear islands. Background Technology

[0002] In the high-temperature gas-cooled reactor environment of the nuclear island, cable trays and support systems, as key nuclear power equipment, must simultaneously withstand the combined effects of high-temperature radiation (≥300℃), strong seismic loads (0.15g~0.3g), and complex mechanical loads. Traditional technical solutions have the following significant drawbacks:

[0003] 1. Insufficient high-temperature resistance and creep resistance of the material.

[0004] Existing cable trays are mostly made of ordinary stainless steel (such as 304 / 316L) or glass fiber reinforced plastic (GFRP), and their maximum operating temperature is usually ≤200℃ (GB / T 20878-2007). Under the conditions of high-temperature gas-cooled reactors above 300℃, stainless steel is prone to sensitization and embrittlement, while GFRP suffers a mechanical property degradation of more than 50% due to resin decomposition.

[0005] 2. Passive seismic resistance systems result in low energy dissipation efficiency.

[0006] Conventional supports and hangers use rigid connections or ordinary rubber shock absorbers, with a damping ratio (ζ) typically ≤0.05 (GB50011-2010). Under seismic wave input, the peak vibration acceleration of the system can reach 0.8g, and the residual deformation exceeds 10mm, which can easily lead to cable detachment or equipment damage.

[0007] 3. Poor adaptability to dynamic loads and limited control strategies.

[0008] Existing systems mostly use fixed-rigidity supports and hangers, making it impossible to adjust the system frequency according to real-time loads. When the equipment operating frequency overlaps with the natural frequency of the cable tray-support system, resonance will occur, resulting in an acceleration response amplification factor of 5 to 8 times. In addition, traditional PID control, due to its fixed parameters, exhibits a steady-state error exceeding 10% and an overshoot of up to 15% under nonlinear loads (such as seismic waves superimposed on mechanical vibrations).

[0009] 4. Low reliability of connectors leads to structural instability.

[0010] Ordinary bolted connections are prone to loosening under vibration conditions, and their locking force attenuation rate can reach 30% / year (ISO2738-2008).

[0011] In summary, existing technologies cannot meet the stringent requirements of high-temperature gas-cooled reactors in nuclear islands for cable trays and support systems, which demand high temperature resistance, strong seismic resistance, adaptive control, and high reliability. Therefore, there is an urgent need for an integrated seismic-resistant cable tray and support system for high-temperature gas-cooled reactors in nuclear islands to solve the above problems. Summary of the Invention

[0012] The purpose of this invention is to provide an integrated system of anti-seismic cable trays and supports for high-temperature gas-cooled reactors in nuclear islands, so as to solve the problems mentioned in the background art.

[0013] To achieve the above objectives, the present invention provides the following technical solution: an integrated system of seismic-resistant cable trays and supports for high-temperature gas-cooled reactors in nuclear islands, comprising a cable tray body, a support system, and an integrated control unit. The cable tray body adopts a multi-layer composite structure, with an outer layer of chromium-aluminum-silicon alloy and an inner layer of silicon carbide fiber reinforcement. The support system includes a dynamic damping device and self-locking connectors, and the damping coefficient satisfies the following conditions: In the formula, c is the damping constant, m is the equivalent mass, and k is the stiffness. The integrated control unit adjusts the stiffness of the support and hanger through real-time load monitoring. The adjustment algorithm is as follows: In the formula, β is the stiffness adjustment coefficient. For reference acceleration.

[0014] Preferably, the composition of the chromium-aluminum-silicon alloy layer satisfies: Fe 55 Cr 25 Al 15 Si 5±2%, and after solution treatment at 1150℃, the volume fraction of the grain boundary precipitate satisfies: V ppt =1-e -3.2t In the formula, t is the heat preservation time.

[0015] Preferably, the silicon carbide fiber reinforcement layer adopts a three-dimensional braided structure, with a fiber volume fraction V f satisfy: In the formula, σ ult E is the ultimate stress of the matrix. f ε is the fiber modulus. crit The critical strain is given.

[0016] Preferably, the dynamic damping device is a magnetorheological fluid damper, and the damping force is calculated using the following formula: In the formula, η is the viscosity, A is the effective area, and τ is the viscosity. y For yield stress, This represents the velocity gradient.

[0017] Preferably, the self-locking connector adopts a double wedge structure, and the locking force meets the following requirements: In the formula, μ is the friction coefficient, N is the normal force, and θ is the wedge angle.

[0018] Preferably, the integrated control unit employs a fuzzy PID control algorithm, and the control law of the fuzzy PID control algorithm includes the following steps:

[0019] First, calculate the error e and the rate of change of error between the actual output and the expected output of the system.

[0020] Let error e and the rate of change of error be used. Fuzzification is the process of mapping them to the membership function of a fuzzy set;

[0021] Fuzzy reasoning is performed based on rules in a fuzzy rule base, which typically contains a series of "if-then" rules, for example:

[0022] If the error is large and the rate of change of the error is large, then increase the proportional gain;

[0023] If the error is small and the rate of change of the error is small, then reduce the integral gain;

[0024] The results of fuzzy inference are defuzzified to obtain specific PID parameter adjustment values;

[0025] Based on the defuzzification results, adjust the parameter K of the PID controller. p K i and K d The control output u(t) is calculated using the adjusted PID parameters and applied to the controlled object.

[0026] The specific control law can be expressed as: Among them, K p K i and K d The parameters are optimized using the particle swarm optimization algorithm, and the error e(t) is the difference between the set load and the measured load.

[0027] Preferably, the total thickness of the cable tray body satisfies the formula: In the formula, P max Where v is the maximum design load, E is the elastic modulus, α is the coefficient of thermal expansion, and ΔT is the temperature difference.

[0028] Preferably, the surface of the cable tray body is coated with a zirconium oxide-based thermal barrier coating, and the coating thickness meets the following requirements: In the formula, k is the thermal conductivity, and t life For the design life, ρc p It is the heat capacity.

[0029] This invention provides an integrated system of seismic-resistant cable trays and supports for high-temperature gas-cooled reactors used in nuclear islands. It offers the following advantages:

[0030] (1) This invention significantly improves the seismic resistance of the system under extreme conditions through the synergistic effect of the dynamic damping device and the self-locking connector. The magnetorheological fluid damper is designed based on the Bingham fluid model and uses the damping force formula to ensure that the peak vibration acceleration of the equipment is reduced from 0.8g to 0.3g under a seismic acceleration of 0.15g, and the residual deformation is ≤5mm. The self-locking connector is designed with a wedge angle of θ = 45° and uses the locking force formula to ensure that the locking force reaches 1500N when the normal force is 5000N, and no loosening occurs during vibration, thus achieving excellent seismic performance and structural safety.

[0031] (2) The cable tray body of this invention adopts a composite structure of a chromium-aluminum-silicon alloy layer and a silicon carbide fiber reinforcement layer. The thickness is optimized using a formula to ensure that the thermal stress is reduced by 40% under a temperature difference of 300℃. After the chromium-aluminum-silicon alloy layer is solution treated at 1150℃, the volume fraction of the grain boundary precipitate increases the creep resistance by 25%. The fiber volume fraction of the silicon carbide fiber reinforcement layer increases the bending strength to 1200MPa, which is 50% higher than that of the substrate. The zirconia-based thermal barrier coating uses a thickness formula to ensure that the surface temperature is ≤200℃, and the radiative heat transfer ratio is only 15% at 1200℃, which significantly extends the service life of the equipment.

[0032] (3) The integrated control unit of this invention adopts a fuzzy PID algorithm and optimizes parameters through a particle swarm optimization algorithm to achieve dynamic shift of the system's natural frequency when the load changes, avoiding resonance, and the response time is ≤0.2s. Verified by a Simulink model, the steady-state error under nonlinear load is ≤2%, and the overshoot is reduced to 5%, significantly improving the control accuracy and stability of the system under complex working conditions. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the process steps of the present invention. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the invention, and should not be construed as limiting the invention.

[0036] Example 1

[0037] A preferred embodiment of the integrated system of seismic-resistant cable trays and supports for high-temperature gas-cooled reactors in nuclear islands provided by the present invention is as follows: Figure 1 As shown: An integrated system of seismic-resistant cable trays and supports for high-temperature gas-cooled reactors in nuclear islands includes a cable tray body, a support system, and an integrated control unit. The cable tray body adopts a multi-layer composite structure, with an outer layer of chromium-aluminum-silicon alloy and an inner layer of silicon carbide fiber reinforcement. The thickness of the cable tray is calculated using the following formula: Among them, P max Take 120kN (nuclear island design load), v = 0.3 (Poisson's ratio), E = 200GPa (elastic modulus), α = 1.2 × 10⁻⁶. -6 / ℃ (coefficient of thermal expansion), ΔT=300℃ (temperature difference). Substituting these values, we get t=8.5mm, but in actual processing, we retain 9mm.

[0038] The support system includes a dynamic damping device and self-locking connectors, and the damping coefficient satisfies: In the formula, c is the damping constant, m is the equivalent mass, and k is the stiffness; the dynamic damping device adopts a magnetorheological fluid damper, and the damping force is calculated using the following formula: In the formula, η is the viscosity, A is the effective area, and τ is the viscosity. y For yield stress, Let be the velocity gradient, where η = 0.15 Pa·s (viscosity) and A = 0.02 m. 2 (Effective area), τ y =50 kPa (yield stress) (Velocity gradient);

[0039] The integrated control unit adjusts the stiffness of the supports and hangers through real-time load monitoring. The adjustment algorithm is as follows: In the formula, β is the stiffness adjustment coefficient. The reference acceleration is used; the integrated control unit adopts a fuzzy PID control algorithm, and the specific control law can be expressed as: Among them, K p =2.5, K i =0.01, K d =0.5 (optimized by particle swarm optimization);

[0040] In this embodiment, the thermal stress of the cable tray body is reduced by 40% under a temperature difference of 300℃, and after the chromium-aluminum-silicon alloy layer is solution treated at 1150℃, the volume fraction of grain boundary precipitates Vppt = 0.82, and the creep resistance is improved by 25%.

[0041] In this embodiment, under a seismic acceleration of 0.15g, the peak vibration acceleration of the magnetorheological fluid damper decreased from 0.8g to 0.3g, and the residual deformation was ≤5mm.

[0042] In this embodiment, fuzzy PID control dynamically shifts the system's natural frequency to avoid resonance, and the response time is ≤0.2s when the load changes.

[0043] Example 2

[0044] Please see Figure 1 Furthermore, based on Example 1, the chromium-aluminum-silicon alloy layer was prepared by vacuum induction melting, with the composition controlled to be Fe. 55 Cr 25 Al 15 Si 5±2%, and after solution treatment at 1150℃, the volume fraction of grain boundary precipitates is calculated using the formula: V ppt =1-e -3.2t Where t = 2h (heat preservation time), V ppt =0.47; the silicon carbide fiber reinforcement layer adopts a three-dimensional braided structure, and the fiber volume fraction V f satisfy: Where, σ ult 800MPa (matrix ultimate stress), E f =400 GPa (fiber modulus), ε crit =0.015 (critical strain);

[0045] In this embodiment, the oxidation resistance of the chromium-aluminum-silicon alloy layer is improved by 30% at high temperature, and the hardness reaches HV450 after solution treatment at 1150℃.

[0046] In this embodiment, the silicon carbide fiber reinforcement layer increases the bending strength of the cable tray body to 1200 MPa, which is 50% higher than that of the matrix.

[0047] Example 3

[0048] Please see Figure 1 Furthermore, based on Examples 1 and 2, the following is obtained: A model is built in Simulink with an input error e ranging from -6 to 6 and an error rate of change e ranging from -5 to 5. The fuzziness is resolved using the centroid method, and the parameter adjustment formula is: ΔK p = -0.8e-0.5ec, Zirconia thermal barrier coating: plasma spraying process, parameters: main gas flow rate 55L / min, current 600A, spraying distance 110mm. Coating thickness is calculated using the formula:

[0049] Example 4

[0050] Please see Figure 1 Furthermore, based on Examples 1, 2, and 3, the following method for verifying the seismic performance of the system is obtained:

[0051] Establish a finite element model and apply a three-dimensional seismic wave input;

[0052] Calculate the response spectrum of the cable tray-support system and verify whether it meets the following requirements:

[0053] In the formula, S a (T) represents the acceleration response spectrum, and R is the safety factor, which is set to 1.5.

[0054] Vibration modes are analyzed using Fourier transform to ensure the dominant frequency f dom Avoid the equipment resonance zone

[0055] When using,

[0056] 1. Load transfer and cable tray bearing capacity

[0057] The cable is supported by a multi-layer composite cable tray body (chromium aluminum silicon alloy layer + silicon carbide fiber reinforcement layer). The thickness of the cable tray is optimized by the thermal stress balance formula to ensure structural stability under a maximum design load of 120kN and a temperature difference of 300℃.

[0058] 2. Vibration Suppression and Energy Dissipation

[0059] The magnetorheological fluid damper of the support system adjusts the damping force in real time using the Bingham fluid model to absorb seismic or equipment vibration energy, reducing the peak vibration acceleration from 0.8g to 0.3g. The self-locking connector, through a wedge-angle design, utilizes the friction self-locking principle to prevent the connection from loosening, ensuring reliable load transmission.

[0060] 3. Dynamic stiffness adjustment and resonance avoidance

[0061] The integrated control unit monitors load changes in real time through sensors and dynamically adjusts the stiffness of the supports and hangers based on a fuzzy PID algorithm, so that the system's natural frequency shifts away from the equipment's resonance zone, thus preventing resonance from occurring.

[0062] 4. High-temperature protection and thermal management

[0063] The zirconia-based thermal barrier coating on the cable tray surface forms a low thermal conductivity barrier through plasma spraying. Combined with the thickness formula, it ensures that the surface temperature is ≤200℃ in high-temperature environments. At the same time, the composite structure of the chromium aluminum silicon alloy layer and the silicon carbide fiber reinforcement layer further reduces the impact of high temperature on the structure through thermal stress balance design.

[0064] In summary, this invention integrates material optimization, dynamic control, and energy dissipation technology to achieve high seismic resistance, high temperature resistance, and adaptive control functions for cable trays and supports in the high-temperature gas-cooled reactor environment of the nuclear island.

[0065] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0066] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An integrated system of seismic-resistant cable trays and supports for high-temperature gas-cooled reactors in nuclear islands, comprising a cable tray body, a support system, and an integrated control unit, characterized in that: The cable tray body adopts a multi-layer composite structure, with an outer chromium-aluminum-silicon alloy layer and an inner silicon carbide fiber reinforcement layer. The support system includes a dynamic damping device and self-locking connectors, and the damping coefficient satisfies the following: In the formula, c is the damping constant, m is the equivalent mass, and k is the stiffness. The integrated control unit adjusts the stiffness of the support and hanger through real-time load monitoring. The adjustment algorithm is as follows: In the formula, β is the stiffness adjustment coefficient. For reference acceleration.

2. The integrated system of seismic-resistant cable trays and supports for high-temperature gas-cooled reactors in nuclear islands according to claim 1, characterized in that: The composition of the chromium-aluminum-silicon alloy layer satisfies: Fe 55 Cr 25 Al 15 Si 5±2%, and after solution treatment at 1150℃, the volume fraction of the grain boundary precipitate satisfies: V ppt =1-e -3.2t In the formula, t is the heat preservation time.

3. The integrated system of seismic-resistant cable trays and supports for high-temperature gas-cooled reactors in nuclear islands according to claim 1, characterized in that: The silicon carbide fiber reinforcement layer adopts a three-dimensional braided structure, with a fiber volume fraction V. f satisfy: In the formula, σ ult E is the ultimate stress of the matrix. f ε is the fiber modulus. crit The critical strain is given.

4. The integrated system of seismic-resistant cable trays and supports for high-temperature gas-cooled reactors in nuclear islands according to claim 1, characterized in that: The dynamic damping device uses a magnetorheological fluid damper, and the damping force is calculated using the following formula: In the formula, η is the viscosity, A is the effective area, and τ is the viscosity. y For yield stress, This represents the velocity gradient.

5. The integrated system of seismic-resistant cable trays and supports for high-temperature gas-cooled reactors in nuclear islands according to claim 1, characterized in that: The self-locking connector adopts a double wedge structure, and the locking force meets the following requirements: In the formula, μ is the friction coefficient, N is the normal force, and θ is the wedge angle.

6. The integrated system of seismic-resistant cable trays and supports for high-temperature gas-cooled reactors in nuclear islands according to claim 1, characterized in that: The integrated control unit employs a fuzzy PID control algorithm, and the control law of the fuzzy PID control algorithm includes the following steps: First, calculate the error e and the rate of change of error between the actual output and the expected output of the system. Let error e and the rate of change of error be used. Fuzzification is the process of mapping them to the membership function of a fuzzy set; Fuzzy reasoning is performed based on rules in a fuzzy rule base, which typically contains a series of "if-then" rules, for example: If the error is large and the rate of change of the error is large, then increase the proportional gain; If the error is small and the rate of change of the error is small, then reduce the integral gain; The results of fuzzy inference are defuzzified to obtain specific PID parameter adjustment values; Based on the defuzzification results, adjust the parameter K of the PID controller. p K i and K d The control output u(t) is calculated using the adjusted PID parameters and applied to the controlled object. The specific control law can be expressed as: Among them, K p K i and K d The parameters are optimized using the particle swarm optimization algorithm, and the error e(t) is the difference between the set load and the measured load.

7. The integrated system of seismic-resistant cable trays and supports for high-temperature gas-cooled reactors in nuclear islands according to claim 1, characterized in that: The total thickness of the cable tray body satisfies the formula: In the formula, P max Where v is the maximum design load, E is the elastic modulus, α is the coefficient of thermal expansion, and ΔT is the temperature difference.

8. The integrated system of seismic-resistant cable trays and supports for high-temperature gas-cooled reactors in nuclear islands according to claim 1, characterized in that: The surface of the cable tray body is coated with a zirconium oxide-based thermal barrier coating, and the coating thickness meets the following requirements: In the formula, k is the thermal conductivity, and t life For the design life, ρc p It is the heat capacity.

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