Operational Flexibility of Two-Phase Flow Test Rig for Investigating the Dynamic Instabilities in Tube Boiling Systems

Abstract

The safe operation of a two-phase heat exchanger can be performed by determining the instability threshold values of power plant parameters. Thus, the power plant parameters must be designed outside these thresholds to avoid undesirable instability. The fluctuations in mass flow and system pressure are undesirable processes, resulting in system failure. In diverse heat transfer distribution, that can lead to burnout of heat exchanger tubes. Therefore, the maintaining of flow stability in a power plant is of particular relevance. The researchers and engineers can predict the threshold of flow instability with dynamic models validated with experimental records. The phenomenon of dynamic flow instabilities in two-phase flows is an important issue that has high relevance for many industries. The awareness about the triggers and the effects of fluid dynamic instabilities is of great importance in the design and operation of steam generators, refrigeration systems, thermosiphons or boiling water reactors. These instabilities manifest themselves in variations of mass flow, pressure, and fluid properties. In this work, the dynamic instabilities involved in evaporation processes were briefly discussed with simple models to understand the mechanism of its different types. Additionally, it is presented the design and construction of a two-phase flow test rig using the similarity and the scaling criteria. A heat recovery steam generator (HRSG) designed by Doosan Heavy Industries and Construction is scaled down to 4 × 4 × 2 m 3. The combination of the flow diagram and the thermohydraulic design is represented in three-dimension model of the test rig using the Siemens NX 10.0 software. The flexibility of operation was taken into account in the design of this test rig. Finally, we provided preliminary results to showcase some functionalities and the capability of the test rig to characterize the existing flow pattern through the evaporator and investigate the internal characteristic curve of the evaporator.

Compact Steam Bottoming Cycles: Minimum Weight Design Optimization and Transient Response of Once-Through Steam Generators

“…Alobaid et al also suggests that dynamic simulation models are capable of reliably predicting the system response to failure malfunctions and to modifications in design and control structures (Alobaid et al, 2015). Temraz et al highlighted that the triggers and effects of fluid dynamic instabilities are of great importance in the design and operation of steam generators and provided preliminary results to showcase some functionalities and the capability of a test rig to characterize the existing flow pattern through the evaporator and investigate the internal characteristic curve of the evaporators in HRSGs (Temraz et al, 2020). Dynamic simulations and controls have been studied for bottoming steam cycles off-shore (Nord and Montañés, 2018) and for alternative working fluid bottoming cycles including air bottoming cycles (Benato et al, 2014) and organic Rankine cycles (Wei et al, 2008;Quoilin et al, 2011).…”