Simulation of heat transfer performance of once-through steam generator under primary side disturbance

doi:10.11949/j.issn.0438-1157.20180281

Abstract

Abstract:

Considering of the liquid-deficient section, the secondary phase transformation process of the OTSG is divided into five heat transfer regions, and then build the one-dimensional homogeneous flow mathematics model based on distributed parameter method. Taking simulation for the case of the primary side coolant inlet conditions change, then analyze the phenomenon of dryout in the steam generator and dynamic response characteristics of primary and secondary side parameters. The simulation results show that the outlet steam can not reach overheating when the inlet enthalpy of the primary side coolant decreases by 5%. The length of the preheating section and the nucleation boiling section increase greatly, the dry point is moved 9.14 m.When the primary side inlet flow decreases, the overheat degree of the outlet steam is reduced, and the maximum moving distance of dry point is about 2.42 m.

Key words: once-through steam generator, homogeneous flow model, mathematical modeling, transient response, heat transfer

摘要：

考虑了缺液区的存在，将直流蒸汽发生器的二次侧相变过程划分为五个传热区域，采用分布参数法建立一维均相流模型，针对一次侧冷却剂入口条件变化的工况进行仿真，分析直流蒸汽发生器内的蒸干现象和一、二次侧参数的动态响应特性。仿真结果表明，当一次侧冷却剂的入口焓值下降5%时，出口蒸汽无法达到过热，预热段和核态沸腾段长度大幅增加，蒸干点后移9.14 m；一次侧入口流量下降，出口蒸汽过热度降低，蒸干位置最大后移约2.42 m。

关键词: 直流蒸汽发生器, 均相流模型, 数学模拟, 瞬态响应, 传热

CLC Number:

TL33

BO Lin, SUN Baozhi, GAN Yiran, DING Hongda, SHI Jianxin. Simulation of heat transfer performance of once-through steam generator under primary side disturbance[J]. CIESC Journal, 2018, 69(S1): 64-71.

薄琳, 孙宝芝, 干依燃, 丁宏达, 史建新. 一次扰动下直流蒸汽发生器动态换热性能仿真[J]. 化工学报, 2018, 69(S1): 64-71.

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