基于IAPWS-IF97的自然循环差压测量修正技术  

Natural Circulation Differential Pressure Measurement Correction Technology Based on IAPWS-IF97

作　　者：郝文涛[1] 李卫华[1] 杨星团[1] 姜胜耀[1] 刘志勇[1] 

机构地区：[1]清华大学核能与新能源技术研究院,北京100084

出　　处：《原子能科学技术》2012年第B12期763-766,共4页Atomic Energy Science and Technology

摘　　要：清华大学核能与新能源技术研究院所设计的低温供热堆一回路采用全功率自然循环,具有很强的固有安全性。由于自然循环压头低,回路阻力对流量有较大影响,因此,降低一回路阻力是反应堆设计的关键技术之一。为验证设计的正确性,搭建了1个试验回路,模拟一回路自然循环。采用差压变送器测量回路压降时,引压管内水的温度差将导致其密度差,并进而带来很大的测量误差。IAPWS-IF97公式在计算水和蒸汽物性时具有很高的精度,为此,开发了基于该公式的ActiveX控件,计算水在不同温度和压力下的密度。将该控件应用到基于组态软件的数据采集系统中,实现了差压测量的在线修正。数据分析结果表明,通过这种修正,大幅提高了差压测量数据的精度。The low temperature nuclear heating reactor（NHR）,developed by Institute of Nuclear and New Energy Technology of Tsinghua University,is highly safe because of its natural circulation at full power level.The driving force of natural circulation is very low,so the flow rate is highly affected by the resistance of the reactor coolant loop.As a result,reducing the flow resistance is a key technology of NHR design.A experiment equipment,which simulated the natural circulation of the reactor coolant loop,was constructed to validate the design.The pressure drop was measured by differential pressure transmitters.The temperature difference of the water in different impulse tubes introduced density difference,which led to large measurement error.Considering the high precision of IAPWS-97,an ActiveX control was developed based on IAPWS-97 to calculate the density of water at deferent pressures and temperatures.The control was used in the data acquisition system based on configuration software platform and the online correction of differential pressure measurement was realized.The testing data analysis shows that the precision of the corrected differential pressure measurement results is highly improved.

关 键 词：自然循环 差压测量 差压修正 IAPWS-IF97 

分 类 号：TL339[核科学技术—核技术及应用]