A method for building a full three-dimensional coupled model of a reactor u-tube steam generator

A steam generator and coupling model technology, applied in the direction of instrumentation, design optimization/simulation, computer-aided design, etc., to achieve model independence, ensure model calculation accuracy, and wide versatility

CN110020476BActive Publication Date: 2020-06-26XI AN JIAOTONG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2020-06-26

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Abstract

A method for establishing a full three-dimensional coupling model of a reactor U-shaped tube steam generator is applicable to all systems in the energy field that use shell-and-tube heat exchangers for energy conversion. The coupling method mainly includes the following parts: 1. Simplification of the geometric model of the steam generator; 2. Establishment of the geometric model of the primary and secondary sides; 3. The three-dimensional calculation node division of the primary and secondary sides; 4. The energy source item space of the tube side (primary side) Discrete; 5. Discretization of energy source items on the shell side (secondary side); 6. Coupling of energy source items on the primary and secondary sides at the same coordinate nodes; 7. Data transfer between primary and secondary sides and internal nodes on each side, iteration a convergent solution. Geometric model simplification is mainly used to simplify the workload caused by a large number of heat transfer tubes for model establishment and numerical calculation; the division of primary and secondary calculation nodes adopts exactly the same division strategy; the energy source items of each side are obtained through discrete flow heat transfer equations; The data exchange of energy source items on both sides is carried out between the corresponding primary and secondary computing nodes under the same coordinates.
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Description

technical field

[0001] The invention relates to the technical field of full three-dimensional thermal engineering coupling of a reactor U-shaped tube steam generator, in particular to a method for establishing a full three-dimensional coupling model of a reactor U-shaped tube steam generator. Background technique

[0002] The steam generator is the heat transfer boundary between the primary circuit pressure barrier and the secondary circuit power system of a nuclear power plant. Its large number of heat transfer tubes occupy up to 60% of the primary circuit system area. To ensure the safety of the reactor system, its integrity must be guaranteed . During operation, the degradation of heat transfer tubes in steam generators due to factors such as stress corrosion, flow-induced vibration, wear, and thermal fatigue will lead to performance degradation and affect normal use. In severe cases, it will directly endanger the safety of the reactor. sex. The thermal-hydraulic analys...

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Embodiment Construction

[0046] Below in conjunction with accompanying drawing, the present invention is described in further detail:

[0047] first according to figure 1 The flow chart of the establishment of the full three-dimensional thermal coupling model of the reactor U-shaped tubular steam generator provided, the model establishment method proposed in the present invention mainly includes the following parts: 1. simplification of the geometric model of the tube bundle area; 2. 1. Establishment of geometric model of porous medium on the secondary side; 3. Division of three-dimensional calculation nodes on the primary and secondary sides; 4. Calculation of energy source items on the primary and secondary sides; 5. Connection of primary and secondary side calculation nodes in the heat exchange coupling area Point processing and energy source item data transfer between primary and secondary nodes; 6. Coupling model inspection and calibration.

[0048] according to figure 2 The given geometric si...