Basic Research and fluidized bed ash comprehensive

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Fluidized bed ash comprehensive utilization of basic research and

Results, indicating that the heat transfer process in the concentration of suspended particles play an important role, and the impact of particle size is limited. In their study conditions, the measured radiation heat transfer share of 25% to 45%. EangenNum-berg 'University Professor Wirth issued a 50 bar pressure in a cold bed test rig of the particle and wall heat transfer between the research findings. 4 desulfurization and nitrogen oxide emission control gave a seven papers on desulfurization involves oxidation of CaS in the PFBC cycle to study the oxygen concentration, particle size on the oxidation. Of an article in the 1023K temperature, while limestone off HC1 and SOz. Found: in both HC1 and SO2 absorption process, the crystallization of CaSO4 CaCI2 a generation (as molten state). Cacl2 partially evaporated into gas, raised to improve the absorptive capacity of SO2. Research article related to fluidized bed combustion of petroleum coke at the same time reduce the s02 and NOx emissions. Study pointed out: when the limestone desulphurization, NOx formation reduction in NOx due to the decomposition of bed ash and bed ash generation of catalytic decomposition of the N2O reduction. U.S. researchers used in pressurized fluidized-bed absorbent alkali metal, the findings that: alkali metal absorbent bed can effectively reduce the gas content of alkali metal vapor, but can not meet the requirements of gas turbine . Korean studies cuO/-A1203 as SO2 absorbent, alkali salt as an additive impact on the removal of SOz, indicating that the addition of alkali salts to increase desulfurization capacity, and can reduce the desulfurization temperature range (450 ℃) and improve the desulfurization effect. NOx emission control on the research, published six papers. Huazhong University of Science thesis of the spray ammonia on the NOx and N2O formation and decomposition. The results show that: ① spray ammonia on the formation and decomposition of NOx and N2O are the important factors are temperature and oxygen concentration. ② who sprayed ammonia NOx and N2O decomposition of the location of the catalyst, fluidized bed combustion with simultaneous control of SOz, NOx and N2O advantages. Technical University of Denmark also issued a favorable desulfurization N2O decomposition results. Queen's University in Canada studied the combustion of coke formation of NO and N20 models. This model considers the temperature, oxygen and NO. Model results with a fluidized bed suspension section of the test results in good agreement. Portugal of the volatile nitrogen combustion generated NO and N2O on the impact. The results indicate: nitrogen compounds in coal and the volatile nature of precipitation temperature on the amount of NO and N2O formation have a major impact. Coke combustion is to produce nitrogen an important source of NO and N2O. Volatile nitrogen combustion produces NO and N2O are the main source of nitrogen and volatile combustion main generate N2O. German study of wet sludge bubbling bed combustion and circulating fluidized bed combustion process and the formation of NO and N2O reduction. CFB results suggest that: the sludge, the combustion process in the coke and the bed material on the catalytic NO generation and reduce the impact less. NH3, NO, oxygen catalytic reaction between NO formation and decomposition is the main mechanism, but by the catalytic decomposition of N2O, non-catalytic or catalytic reaction of coke larger. N2O formation of nitrogen oxide from the sludge or by the reduction of NO and HCN reaction. Bubbling bed burning of sludge, the formation of NOx during combustion reaction can associate a model to simulate, forecast data in good agreement with the measured data. 5 fluidized bed ash characteristics, utilization and impact on the environment related aspects of fluidized bed ash l3 thesis papers, close to the total number of articles 1 / 10, indicating that the fluidized bed ash characteristics, utilization and environmental increasingly attracted researchers of attention. 5.1 ash physical and chemical properties of ash from the fluidized bed ash (coarse slag) and the collection of fly ash (fine ash) group l war. Coarse slag and fly ash chemical composition and physical and chemical properties are different. Ash is mainly affected by the physical and chemical properties of coal ash composition, bed operating conditions and other factors limestone composition. Metals contained in fly ash content on a rich effect. The reactivity of limestone ash CaC03, CaO. CaSO4 component affected. Ash content of the metal composition and its physical and chemical properties greatly. Ash in the Fe203, A1203 and SiO4 self-hardening characteristics of the ash had significant effects. MgO content of the cement caused by the expansion and crack. Cadogan CaO components. The ash is alkaline. Ash in the ash comprehensive utilization of the metal components on impact. Foster Wheeler company has established a fluidized bed boiler ash physical and chemical properties of the database, and proposed different methods of using ash. (Continued on page 45)