高温气冷堆板翅式回热器的分布参数模型

Distributed Parameter Model of Plate-Fin Recuperator in High Temperature Gas-Cooled Reactor with Direct Helium Turbine Cycle

板翅式回热器是高温气冷堆直接氦气透平循环中的重要部件。针对逆流板翅式回热器,提出了一个一维的分布参数模型来研究其动态性能,并用整场离散、整场求解的方法求解了该模型。通过对回热器高温侧入口温度扰动的模拟和分析,发现与扰动同侧出口温度的响应过程可以用一个带滞后的惯性环节来表达,而与扰动异侧出口温度的响应过程可以用一个过渡过程时间极短的惯性环节来表达。对于流量扰动而言,回热器出口温度的动态特性也可以采用惯性环节来表达。在此基础上,利用该模型模拟了一个温度和流量耦合变化的响应过程。结果表明该模型不仅能用于简单扰动的模拟,还可以用于复杂扰动的模拟和分析。

Recuperator was one of the important equipments in high temperature gas-cooled reactor with direct helium turbine cycle. A one-dimensional distributed parameter model was proposed for the counter-flow plate-fin recuperator to study its dynamic performances. Method of whole-field dispersed and solved was used to solve the model. Through the simulation and analysis of the step disturbance, response of the outlet temperature on the same side with disturbance might be expressed by inertial item with delay. Response of the outlet temperature on the different side with distribution could be expressed by inertial itemwith very short transition time. For flow rate disturbance, response of outlet temperatures also could be expressed by inertial item. The response process to a coupled disturbance of temperate and flow rate was simulated. The results showed that the distributed parameter model was not only used to simulate simple transient processes, but also used to complicated ones.