Sürdürülebilir Kalkınma Amaçları
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- MakaleYalnız künye2021Investigation of Effect of Dew Point Temperatures on Design of Condensing Heat Recovery Units According to Fuel Types
Terhan, Meryem
In this study, dew point temperatures of water and sulphuric acid vapour in flue gas are predicted as theoretical for fuels types such as coal, fuel oil, natural gas, LPG, wood with the different cities in Turkey. The factors like the excess air coefficient, relative humidity rate and the altitude of the city affected by the dew point temperatures and the mole ratios of water and sulphuric acid vapour in flue gas are studied. According to the results of the study, while the water dew point temperature changes for coal, wood, fuel oil, natural gas and LPG, over the range 30-40 degrees C, 40-50 degrees C, 37-50 degrees C, 44-60 degrees C and 41-56 degrees C, respectively; the acid dew point temperature waves to 125 degrees C from 140 degrees C for coal types and to 131 degrees C from 145 degrees C for fuel oil types in Turkey. To predict the condensing zone, a condensing economizer for a natural gas-fired boiler in a heating system is designed with Finite difference method. According to the results of the design, while the first 100 m of the heat exchanger tube is non-condensing zone, the only 10 m is the condensing zone.
- MakaleAçık Erişim2021PREDICTION SULPHURIC ACID AND WATER VAPOUR DEW POINT TEMPERATURES OF FLUE GASES AND COMBUSTION ANALYSIS FOR SOLID FUELS IN TURKEY
Terhan, Meryem
In the study, the combustion analysis is examined for the solid fuels in Turkey. The principal aim of the analysis is determined the limits and obstacles in the design heat exchanger to avoid the corrosion risk on the heat exchanger surfaces in the latent heat recovery applications from waste flue gas. To do this, in which regions of the heat exchanger the flue gas temperature reached to the sulphuric acid and water vapour dew point temperatures are required to predict. In order to predict the condensing zone, an air preheater for the coal-fired boiler in a heating system is designed using finite difference method. Designed the air preheater is consists of the counter-cross flow, U-shaped stainless steel tube bundle. The tube is discredited 200 cells to one-dimensional during the flow. The heat transfer rates, the flue gas and air inlet and outlet temperatures, surface temperatures of the tube wall, the mole fractions of water and sulphuric acid vapour, the other non-condensing gases in the flue gas are calculated in each discrete cell. According to the results of the study, while the dew point temperature of the water vapour changes over the range 30-40 °C, the acid dew point temperature waves to 125 °C from 140 °C for the coal types mined in Turkey.