SEARCH RESULT

Circulating Fluidized Bed Boilers (CFBB) provide the most suitable combustion system for efficient and clean burning and gasification of low quality lignite. In this study, the bed material volume fraction, temperature and the pressure distribution in the furnace were investigated by burning four different types of coal in a ÇAN TS furnace geometry underspecified boundary conditions. A CPFD(Computational Particle Fluid Dynamics)method was used for the numerical analyzes in this study. A MP-PIC (Multiphase-Particle in Cell) method was used to solve gas-solid multiphase flows in the numerical analyzes. An EMMS-YANG 2004 drag model, a SIMPLE solution algorithm, a Particle Donor Cell Differencing discretization method and the LES turbulence method were also used in the numerical analyzes. Time steps for the numerical analyzes were taken every 5 s, and the analyzes were performed over 200 seconds. The numerical models were verified by ÇAN TS experimental results. The temperature, pressure, particle velocity and bed material volumetric ratio distributions in the CFBB combustion chamber were compared for four different lignites. The study results showed that the average sand volume ratio in the base of the furnace and in the combustion chamber varied from 0.4 to0.6, but after secondary air combustion was used in the furnace, the volume ratio of sand in the furnace’s combustion chamber changed from 0.07 to 0.10.

1.st International Conference Energy Systems Engineering
ıcese'17

Osman İPEK Barış GÜREL Mehmet KAN

Circulating Fluidized Bed Boilers (CFBB) provide the most suitable combustion system for efficient and clean burning and gasification of low quality lignite. In this study, the CO, CO2, H2O, SO2 and NOx emissions distribution in the furnace were investigated by burning four different types of coal in a ÇAN TS furnace geometry under specified boundary conditions. A CPFD(Computational Particle Fluid Dynamics)method was used for the numerical analyzes in this study. A MP-PIC (Multiphase-Particle in Cell) method was used to solve gas-solid multiphase flows in the numerical analyzes. An EMMS-YANG 2004 drag model, a SIMPLE solution algorithm, a Particle Donor Cell Differencing discretization method and the LES turbulence method were also used in the numerical analyzes. Time steps for the numerical analyzes were taken every 5 s,and the analyzes were performed over 200 seconds. The numerical models were verified by ÇAN TS experimental results. The NOx emission, SO2 emission, CO2 molar ratio, CO molar ratio, H2O molar ratio and O2 molar ratio distributions in the CFBB combustion chamber were compared for four different lignites. For the lignites burnt under the specified boundary conditions, the highest average CO2 molar rate at the furnace exit was found when analyzing the burning of Çan lignite, the highest average CO molar rate at the furnace exit was found when burning Beypazarı lignite, the highest average NOx emissions in the furnace exit was found when burning GLİ- Tunçbilek lignite, the highest average SO2 emission rates at the furnace exit were seen when burning Ilgın lignite

1.st International Conference Energy Systems Engineering
ıcese'17

Osman İPEK Barış GÜREL Mehmet KAN

Laser sintering technology(LST), which has been widely used recently, is a very important method to produce precise and qualified parts which cannot be manufactured with conventional methods. In this paper, the thermal behaviors and heat transfer performances of brazed plate heat exchanger (BPHE) and monoblock heat exchanger (MBHE) produced by laser sintering method from the AISI 316 stainless steel powder are numerically analyzed and experimentally investigated in an experiment setup. In analyzes, the inlet temperatures and mass flow rates of the hot and cold water are , and , , respectively . According to analysis results; outlet temperatures of cold and hot fluids circulated in MBHE are , respectively, while that in BPHE are and . According to experimental results, outlet temperatures of cold and hot fluids in MBHE were measured as , , respectively. As results of numerical and experimental analysis, heat transfer performance of the MBHE is 47.7% higher than BPHE, while its volume is 44.39% less. By comparing the results obtained from numerical and experimental analysis, it is observed that the results are consistent with each other

1.st International Conference Energy Systems Engineering
ıcese'17

Mehmet KAN Osman İPEK Barış GÜREL