Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 18 of 18 for “"Superheater"”.
-
Steam temperature and flow maldistribution in superheater headers
… models of the outlet stubbox header of a final superheater (FSH) heat exchanger in a 620MW coal-fired drum type boiler. The process models were used to assess the impact of steam flow and temperature distribution on the thermal stresses in the header material. The process models were developed …
-
Simulation of Combustion and Thermal Flow inside an Industrial Boiler
… In real applications, the operation of the superheater for producing high-pressure, high-temperature steam may result in problems frequently caused by ruptured superheater tubes. To make the boiler more efficient, less emission and less prone to tube rupture problems, it is important to …
-
A methodology to investigate the cause of quenching in once-through tower type power plant boilers
… for investigating condensation of steam in the superheater. The model is presented and verified by comparison with real plant data. The second element is a liquid tracking model that approximates the liquid level in the superheater as a function of time to predict the location and magnitude of …
-
A methodology for integrated thermofluid modelling of radiant superheaters in steady state and transient operations
… in coal-fired power plants such as final superheater heat exchangers experience severe conditions associated with high metal temperatures and high temperature gradients during base load and transient operations. Such adverse conditions could significantly reduce the life span of the …
-
Studying water-wedging as a cause for short term overheating in the boiler of a coal-fired power plant
… a ductile failure of the tube material. The superheaters are particularly susceptible to STO. Such a failure can be caused by various conditions, where most of these are condition-based, i.e. based on the physical condition of the pipes or boiler. However, there are some cases which are …
-
Small Modular Boiling Water Reactor Combined with External Superheaters
… Water Reactor (SMBWR) combined with external superheaters. The SMBWR is a BWR-type small modular reactor. It is designed to adopt natural recirculation of coolant within its primary system. The SMBWR is also combined with the external superheater system. The system consists of 3 pieces of …
-
An examination of boiler failures and associated design issues
… consider such treatment. The economizer, superheater and reheater were the boiler components selected for this study. The study was restricted to these three boiler components, although excess hoop stress and cracking failures do occur in other regions of the boiler as well. All three …
-
Testing and modeling of compressors for low-lift cooling applications
… speed scroll compressor is tested on a de-superheater test stand to determine its performance in areas of low-lift and low compressor speed. The goal is to adapt this test stand so that it could be used to test a reciprocating compressor in this region. A control program is written to …
-
Structural integrity assessment of engineering components under cyclic loading at high temperature
… analyse creep-cyclic plasticity behaviour of a superheater outlet tube plate subjected to a cyclic thermo-mechanical load, and to evaluate creep-fatigue damage endurance;Finally, this thesis introduces a critical high temperature failure mechanism, named as Structural Creep Recovery Mechanism …
-
A Study of High Temperature Corrosion in an AFBC System
<p>The occurrence of furnace wall and superheater corrosion in fluidized bed combustor systems has caused some operational and economic concerns. It is generally accepted that chlorine and sulfur may play roles in this corrosion. In order to predict the performance of high chlorine or high sulfur …
-
Conceptual design of an annular-fueled superheat boiling water reactor
… proposed design, ASBWR, combines the boiler and superheater regions into one fuel assembly. This ensures good neutron moderation throughout the reactor core. A single fuel design is used in the core. Each annular fuel element, or fuel tube, is cooled externally by boiling water and internally by …
-
A physics-informed neural network modelling methodology to analyse integrated thermofluid systems
… consisting of a furnace and radiative convective superheater. The predictions of the three PINN models were compared to benchmark solutions generated via conventional, physics-based thermofluid process models. The largest average relative error across all three models is only 0.93%, indicating …
-
Integrated process and control modelling of water recirculation in once-through boilers during low load and transient operation
… fatigue damage on the economiser, evaporator and superheater components and the risk of turbine quenching incidents. The purpose of this study was to develop an integrated process and control model that can be used to study transient events. The model developed in Flownex can simulate the complex …
-
Stress and creep damage evolution in materials for ultra-supercritical power plants
… including the main steam pipes, headers and superheater tubings. These steels are less costly, and they have a lower coefficient of thermal expansion and a higher thermal conductivity when compared with austenitic stainless steels, making them less susceptible to degradation through thermal …
-
The Off-Design Modelling of a Combined-Cycle Power Plant
… of each component (economiser, evaporator, superheater) could be calculated. The overall conductance (UA) of each component was calculated in the design mode for the system to be evaluated in off-design mode. The development of an analytical model provided detailed understanding of the …
-
Detailed model for robust feedback design of main steam temperatures in coal fired boilers
… efficiency: Excessive attemperation in the superheater passes is generally associated with high flue gas temperatures which decrease thermal efficiency. Therefore, robust control of the attemperation system leads to an increase in heat uptake between the flue gas and steam in the boiler, …
-
Continuum Damage Mechanics (CDM) modelling of dislocation creep in 9-12% Cr creep resistant steels
… these plants specifically within the boiler and superheater pipe sections where the most extreme thermodynamic conditions are experienced. The most commonly used materials for these applications are in the family of ferritic/martensitic 9-12% Cr steels chosen for their superior material …
-
Dynamic simulation of nuclear hydrogen production systems
… plant was partially represented as a steam superheater in the heat transfer loop. The third contribution is the demonstration of the safety characteristics of the nuclear hydrogen production plant by subjecting the plant model to three accident scenarios. The scenarios involved disruptions …