Distributed parameter model of plate-fin recuperator in high temperature gas-cooled reactor with direct helium turbine cycle

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 item with 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. (authors)