Papers by Keyword: Flue Gases

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Authors: Zi Qing Ye, Xiao Yi Yu
Abstract: Combustion of power fuel in a large thermal power plant produces a great deal of harmful flue gas, which endangers personal safety of residents around it. In this paper, the injury mechanism of flue gas ejected by the thermal power plant is analyzed. The injury indexes of flue gas ejected by the thermal power plant are put forward. In order to improve the safety status of flue gas ejected by the thermal power plant, we developed a special instrument, which can detect on-line the injury indexes of flue gas ingredients, particle species, ejection speed and ejection flux in the ejected flue gas. The detection data can be used to assess the safety statue of the ejected flue gas, to predict the injury degree of the ejected flue gas to people and to provide basic data for establishing the valid emergency schemes.
1906
Authors: Maria Cristiana Enescu, C. Marius Vlădulescu, Aurel Gaba, Vasile Bratu, Elena Valentina Stoian, Ivona Camelia Petre
Abstract: This paper analyzes the possibility of reducing the cold end corrosion in boilers and furnaces by using a new type of air combustion pre-heater. Cold end corrosion appears due to catalytic oxidation of the sulfur dioxide to sulfur trioxide and then due to the sulfuric acid condensation at dew point. Calculating dew points of various acid gases and options for reducing cold end corrosion of heat recovery exchangers are presented. For avoiding the cold end corrosion we design a new type of air combustion pre-heater for boilers and furnaces. Also, the tube skin temperature of the first row of pipes of the actual air pre-heater was simulated with this computer program, in order to determine whether this temperature is lower than acid dew point of flue gas. With the simulation for this configuration of the actual combustion air pre-heater, the skin temperature for the first row (for the combustion air flow) of tubes from the upper bundle was TS = 134 °C. A way to reduce the cold end corrosion in the combustion air pre-heaters is raising the temperature of the combustion air at the air pre-heater entrance. This solution involves taking a quantity of preheated air, recirculation and then reintroducing it in the air pre-heater. In the same time, this solution avoiding to use the steam radiator, mounted after the fan, for pre-heating the combustion air from 1°C to 45°C. Thus, the furnaces equipped with the new combustion air pre-heater and modern low NOx burners made a fuel economy about 3%.
157
Authors: B.Ch. Meskhi, Y.I. Buligin, L.N. Alexeenko
Abstract: Efficiency of the dedusting of flue gases of the technological processes is reached at the expense of the new constructive solution of the cyclonic device in which possibility of the regulation of its geometrical parameters depending on properties and characteristics of the air-and-coal environment is provided. Results of pilot studies are presented, the engineering calculation procedure and a choice of the sizes of such devices is developed
46
Authors: Susilawati Toemen, Rusmidah Ali, Wan Azelee Wan Abu Bakar
Abstract: The recycling technology by the catalytic conversion offers a very promising technique for reducing greenhouse CO2 gas from flue gases of coal burning power plant by converting the carbon dioxide gas to methane. The methane produced from the reaction can be used as other fuel to run turbine for electricity generation. Therefore, the strontia based catalysts was prepared by impregnated with RuMn/Al2O3 catalyst and then calcined at 1000°C for 5 hour. Strontia catalyst is an effective material because of its highly basic properties which could enhance carbon dioxide adsorption and chemisorption on the catalyst surface but not been widely explored. The result obtained revealed that the addition of Sr to RuMn/Al2O3 as based catalyst had increased the catalytic activity and found to be more active for promoting the CO2 methanation reaction. Under reducing pretreatment at 300°C, the activity of CO2 conversion increased about 30.98% which is from 50.45% over RuMn-65/Al2O3 catalyst to 73.10% over RuMnSr-65/Al2O3 catalyst with 40% of methane yielded at reaction temperature of 210°C. The Sr addition did not modify the crystalline structure of the catalyst but gave higher surface area, smaller particle size and high metal dispersion as well as increased the degree of reduction and CO chemisorption.
371
Authors: Jarosław Milewski, Wojciech Bujalski, Marcin Wołowicz, Kamil Futyma, Rafał Bernat
Abstract: The paper presents an experimental investigation of using a Molten Carbonate Fuel Cell (MCFC) for reducing CO2 emission from the flue gas of a lignite boiler. The MCFC is placed in the flue gas stream and separates CO2 from the cathode side to the anode side. As a result, a mixture of CO2 and H2O is obtained; from which pure CO2 can be obtained by cryogenic condensation of water and carbon dioxide. The main advantages of this solution are: additional electricity generated, reduced CO2 emissions and higher system efficiency. The results obtained show that the use of an MCFC could reduce CO2 emissions by 90% with over 30% efficiency in additional power generation.
299
Authors: Jing Dong Zhao, Shi Jun Su, Xiao Fan Zhu, Hong Lei Wang
Abstract: It’s a gas-liquid-solid three-phase reaction system in the reactor for flue gas desulfurization using pyrolusite pulp. Based on the two-film mass transfer theory and shrine core model, the macro-kinetics of flue gas desulfurization using pyrolusite pulp in a double magnetic stirred reactor were investigated. The effects of diffusion in solid film, surface chemical reaction, diffusion in liquid phase and gas phase of the process, have been carried out to distinguish the control step of the process. It was observed that SO2 absorption efficiency increased with the decreasing of pyrolusite particle size and varied gently when the pyrolusite particle diameter decreased to 0.18mm. SO2 absorption efficiency increased not significantly along with the increase of temperature and the liquid phase stirring speed but increased significantly along with the increase of the gas phase stirring speed. Experiment results showed that under simulated industrial conditions, gas phase diffusion was the control step compared to other related factors, given that pyrolusite particle diameter was kept below 0.1mm.
32
Authors: Anita Lloyd Spetz, Lars Unéus, Henrik Svenningstorp, H. Wingbrant, Chris I. Harris, P. Salomonsson, P. Tengström, P. Mårtensson, P. Ljung, M. Mattsson, J.H. Visser, S.G. Ejakov, D. Kubinski, Lars-G. Ekedahl, Ingemar Lundström, Susan Savage
1415
Authors: H. Wingbrant, Lars Unéus, Mike Andersson, J. Cerdà, Susan Savage, H. Svenningstorp, P. Salomonsson, P. Ljung, M. Mattsson, J.H. Visser, D. Kubinski, R. Soltis, S.G. Ejakov, D. Moldin, M. Löfdahl, M. Einehag, M. Persson, Anita Lloyd Spetz
953
Authors: Jing Dong Zhao, Shi Jun Su, Nan Shan Ai, Xiao Fan Zhu
Abstract: A mathematical model for flue gas desulfurization using pyrolusite pulp in jet bubbling reactor (JBR) was described. Firstly, based on the concept of two stages mass balance with chemical reaction, two models were set up, for jet bubbling zone and rising bubble zone, respectively, according to the construction of JBR. The models consist of two coupling differential equations and were solved simultaneously by integral and separation of the variables. Then the SO2 absorption efficiency expression was developed, considering the great discrepancy existing between the gas-side mass transfer coefficients of the jet bubbling zone and gas bubble rising zone. The final expression associates SO2 absorption efficiency with process conditions and JBR structure parameters, which can give some instruction and guidance for the study of reactor operation process. Predicted results from the theoretical model, including effect of pH value of the pulp, flue gas temperature and inlet SO2 concentration of flue gas on SO2 absorption efficiency, were found to be in good agreement with experimental data obtained in a jet bubbling reactor. The model provides a basis for the process scale up and operating guide.
85
Authors: Nitin Sharma, Aman Goel, Avishek Ghosh, Abhimanyu Kohli
Abstract: Mankind’s lax approach towards energy sources during its past years of incessant growth has led to chopping of fossil fuels and done immense harm to the environment. Today we are faced with a challenge to develop eco friendly systems that ensure sustainable development with minimum harm to our fragile surroundings We propose a system consisting a Stirling engine that, using the temperature difference between the condenser inlets and outlets of a power plant (nuclear or thermal), produces power. This will sooth our problems to some extent. In this paper, we will briefly discuss the working of thermal/nuclear power plants in combination with Stirling engine in order to increase the efficiency of conventional power plant systems up to the order of 80% . Above all our system causes lower emissions when compared to the already existing systems since the engine producing power has zero emission. The main advantage of our proposed system is that there will be increase in power production of the existing plants without any further increase in the energy supply. This small auxiliary system working in synchronization with the main system increases the overall efficiency of the plant by increasing the power output without additional energy being expended and also reduces the load on the power plants during peak load requirements.
1106
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