Steady-State Thermal-Hydraulic Analysis of Steam Generator with Axial Economizer Based on Node Method
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摘要: 基于一维流动假设、传热假设和两相热平衡假设等，采用集总参数法和分布参数法相结合，建立了轴流式预热蒸汽发生器的一维稳态热工水力分析模型。采用C++语言编程，将计算结果与某典型轴流式预热蒸汽发生器热工水力参数的设计值进行对比，结果表明大部分总体参数计算结果的相对误差都在3%以内，验证了模型的合理性；蒸汽发生器中温度、空泡份额、压力等参数沿一次测流体流动方向的变化趋势，符合热工水力学及定性机理分析结果，说明所建立的模型和求解方法能够较准确预测轴流式预热蒸汽发生器稳态热工水力参数分布。
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关键词:
- 轴流式预热蒸汽发生器 /
- 热工水力分析 /
- 稳态
Abstract: Based on the one-dimensional flow hypothesis, heat transfer hypothesis, and two-phase thermal equilibrium hypothesis, a lumped parameter method and a distributed parameter method are used to establish a one-dimensional steady-state thermal-hydraulic analysis model of the steam generator with axial economizer. Using C++ language programming, the calculation results are compared with the design values of the thermal-hydraulic parameters of a typical steam generator with axial economizer. The results show that the relative error of most of the overall parameter calculation results is within 3%, which verifies the rationality of the model. The analysis of the temperature, cavitation share, pressure and other parameters of the steam generator along the direction of the measured fluid flow trend consist well with the results of thermal hydraulics and qualitative mechanism analysis, indicating that the model and solution method established in this paper can accurately predict the steady-state thermal hydraulic parameter distribution of the steam generator with axial economizer. -
图 1 轴流式预热蒸汽发生器的几何模型
Figure 1. Geometric Model of Steam Generator with Axial Economizer
图 3 轴流式预热蒸汽发生器管束区主控制体i节点分布图
Figure 3. i-node of Main Control Body of Tube Bundle Area of Steam Generator with Axial Economizer Distribution
图 4 一维稳态热工水力分析程序流程图
Figure 4. Flow Chart for One-Dimensional Steady-State Thermal Hydraulic Analysis
图 5 温度沿一次侧流体流动方向分布
Figure 5. Temperature Distribution along Primary Fluid Flow Direction
图 6 热流密度及一、二次侧换热系数沿一次侧流体流动方向分布
Figure 6. Heat Flow Density and Primary and Secondary Heat Transfer Coefficients Distributed along Primary Fluid Flow Direction
图 7 二次侧空泡份额沿一次侧流体流动方向分布
Figure 7. Distribution of Secondary-Side Cavities Along Direction of Primary Fluid Flow
图 8 一、二次侧压力沿一次侧流体流动方向分布
Figure 8. Primary and Secondary Pressure Distribution along Primary Fluid Flow Direction
图 9 一、二次侧速度沿一次侧流体流动方向分布
Figure 9. Primaryand Secondary Side Velocity Distribution Along Primary Side Fluid Flow Direction
表 1 计算结果与典型轴流式预热蒸汽发生器热工水力参数比较
Table 1. Comparison of Calculation Results with Thermal-Hydraulic Parameters of a Typical Steam Generator with Axial Economizer
参数名 设计值 计算值 相对误差/% 二次侧蒸汽产量/(kg·s−1) 638.4 640.39 0.3117 出口蒸汽压力/MPa 7.71 7.721 0.1426 冷侧循环倍率 1.2 1.235 2.9 热侧循环倍率 2.4 2.393 0.3 循环倍率 3.6 3.628 0.77 二次侧水质量/t 77.2 78.945 2.260 二次侧汽质量/t 5.5 5.612 2.036 二次侧汽、水总质量/t 82.7 84.566 2.256 一次侧出口温度/℃ 295.4 295.465 0.022 一次侧平均温度/℃ 312.6 312.654 0.017 一次侧总压降/MPa 0.28 0.287 2.5 
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