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Show COMBUSTION CHAMBERS WITH MICRODIFFUSION COMBUSTION OF GAS1 Vladimir N.Gruzdev, A.A.Askerov Kazan State Technical University, Tatarstan, Russia Alexander P.Kozlov Power Engineering Department, Kazan Science Centre, Russian Academy of Sciences, Russia Yaroslav P.Chudnovsky Institute of Gas Technology, Des Plaines, IL, U S A ABSTRACT Problems connected with a quality of combustion process take place in several industries where hydrocarbon fuel is used as a source of heat. A m o n g these problems, the most important are relatively high concentration of N O x , C O , CnHm in combustion products, low thermal-power density of combustion chamber, hardly controllable distribution of the temperature of combustion products at chamber outlet, and complexity of safe cooling of combustion chamber walls. In this paper a novel chamber with single-stage gaseous fuel combustion is proposed [1, 2]. The chamber is of straight-flow type. Distributed fuel feeding over entire cross-section of the chamber is used. Gas combustion is established in short diffusion flames stabilized on fuel manifolds. All the above-listed problems have been solved by ideas used in the combustion chamber design. INTRODUCTION At the developing the industrial combustion chambers for gaseous fuel, manufacturers usually face the problems connected with high concentration of pollutant emissions (N0X , C O , CnHm) in combustion gases and low thermal-power density of flame (or operating space of the combustion chamber). Because of that a significant incomplete combustion appears in combustion space of the chamber. Therefore, a fuel burns down in long diffusion flames outside the combustion chamber space. As the thermal-power density of the combustion chamber rises the hydraulic resistance of the combustion chamber duct increases. Also, in some cases, gas temperature distribution at the outlet of combustion chamber (gas turbine engines, brick and ceramic kilns, and etc.), which is usually hardly controllable, plays an important role. For example, a significant irregularity of flame temperature profile in brick and ceramic kilns leads to hot-spotting of the burnt surface, thus facilitating the flows. In most drum kilns to warm up and dry the bulk materials, a fuel burning and a load warming-up take place simultaneously in the same furnace space. However, it is obvious that the combination of 1 Presented at the 1997 A F R C International Symposium "Combustion Technology for Improving Productivity and Product Quality", Chicago, Illinois, USA, September 21-24, 1997 |