摘要
在液态金属自然循环回路的计算分析过程中,已有研究一般忽略散热损失,常导致计算结果与实验结果有较大的区别。为研究散热损失对液态金属自然循环回路稳态特性的影响,利用MATLAB/Simulink编制了含有散热损失模型的铅铋自然循环回路计算程序,并用实验结果进行了验证。利用该程序,分析了不同热功率、中间热交换器二次侧流量和环境温度下散热损失对自然循环回路稳态参数的影响。计算结果表明:通过减小散热损失可提高回路的自然循环流量;当二次侧流量较小时,散热损失对循环流量的影响更为明显;通过增加二次侧流量或适当增加热功率可减小散热量占总热功率的比例,提高热量利用率;当二次侧流量不变时,不同热功率下环境温度对回路的自然循环流量的影响不明显,但热量利用率会随环境温度的升高而增加。
The heat loss was often neglected in existing analysis of liquid metal natural circulation loop ,which may cause differences between calculation results and experi‐mental data .In order to study the influence of heat loss on the steady‐state characteris‐tics of liquid metal natural circulation loop ,a lead‐bismuth natural circulation loop code was developed by using MATLAB/Simulink and validated by the experimental data . Furthermore ,the influences of heat loss on the steady‐state parameters of natural circulation loop were analyzed by using the code under different thermal powers , secondary flow rates of intermediate heat exchanger and ambient temperatures .It is found that the natural circulation flow rate could increase by decreasing the heat loss . The flow rate would be more easily affected by the heat loss when the secondary flow rate is low .On the other hand ,the ratios of heat loss to total thermal power could decrease by increasing the secondary flow rate or thermal power properly ,so the heat utilization factor could also increase .The ambient temperature would not influence the loop natural circulation flow rate obviously under different thermal powers when the secondary flow rate is constant ,while the heat utilization factor would increase with the ambient temperature .
出处
《原子能科学技术》
EI
CAS
CSCD
北大核心
2015年第9期1599-1605,共7页
Atomic Energy Science and Technology
关键词
自然循环
散热损失
循环流量
铅铋
natural circulation
heat loss
circulation flow rate
lead-bismuth
