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| Autor: | Han-Ching chang, 張翰青 |
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| Rok vydání: | 2005 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 93 The residents’ environmental consciousness is rising more and more by time. In order to meet this demand, how to use the most abundant energy of coal as well as improving the efficiency of energy production technologies is being carried out. IGCC(Integrated Gasification Combined Cycle) is one of the ideal method to solve environmental and economic problem by using fossil fuels, especially coal. Hot gas desulfurization is crucial issue in the development of the IGCC system. Nowadays, all commercial IGCC power plants utilize wet desulfurization processes to remove H2S from hot coal gas. However, coal gas was cooled by the wet processes would be decrease the thermal efficiency of the system significantly. Therefore, high temperature removal of H2S techniques is the targets for the researchers in this field. Desulfurization of hot coal gas using the sludge from Ferrite Process sorbent in a fixed bed reactor was conducted in this study. It can be one kind of clean and recycle materials. The explanation of results can be divided into five major parts. 1.After multi-cycle desulfurization ferrite sorbent’s utilization was decayed as time rising. It may be concerned with decrease of BET surface area and accumulate of sulfur. 2.The effects of operating factors, such as CO inlet concentration, H2 inlet concentration and temperature on the removal of H2S were performed. The results show that the sorbent utilization increases with the CO concentration and decrease with the H2 concentration. This can be explained through the water-shift reaction. 3.Thermogravimmetry analysis under oxidation/reduction condition. Under reduction condition, ferrite sorbent will be reducted to low-activity iron oxide even elemental iron. Under oxidation condition, some part of sulfurated ferrite sorbent will be oxidized to FeSO4. It will be continuing oxidized to ferrite sorbent. 4.In the XPS analysis for surface and deeper depth, we can find there was obvious difference for sulfurated ferrite sorbent. Surface structure tends to oxidation state and deeper structure tends to reduction state. 5.In the operating range of this study, we can find that the both deactivation model type I and deactivation model II can simulate the desulfurization reaction. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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