Showing papers on "Afterburner published in 2000"

Inert gas generator for fire suppressing

Abstract: Disclosed is an inert gas generator to produce a large quantity of inert gas within a short period of time. The inert gas generator comprises: a gas turbine consisting of a starter motor, compressor, combustor and turbine body; an afterburner being connected to a exit of the gas turbine to re-burn gas burned in the combustor and being equipped with a flame stabilizer; a cooling chamber being equipped with spray nozzles to eject water to decrease gas temperature in the afterburner exit; an evaporator set to further cool the gas-steam mixture from the afterburner; a cooling chamber and spray nozzles; an exhaust nozzle to guide the direction of the inert gas-steam mixture of low temperature and oxygen content; and a controller for controlling the starter motor, the fuel pump and combustor. The inert gas generator mounted on a movable vehicle can promptly suppress the fire occurred in various places with least amount cost possible.

Scaling criteria for the development of an acoustically stabilized dump combustor

Abstract: Acoustic stabilization of combustion in a dump configuration results in completion of combustion in a relatively short residence time with simultaneously low emissions of oxides of nitrogen, carbon monoxide, and hydrocarbons. Acoustically stabilized combustion is also a potential means for achieving closed-loop active control of combustion. Therefore, a promising burner configuration identified through laboratory bench-top experiments was developed and scaled up for application as an afterburner for a starved-air incinerator with the objective of providing a compact device capable of achieving pollutant emissions performance better than required by current International Maritime Organization regulations. In the absence of established scaling criteria, factors governing vortex generation and jet mixing theory were examined. These provided useful guidelines for burner design as the dump combustor was successively scaled up from a 4.75 kW laboratory experiment to a nominal 700 kW unit tested on a starved-air incinerator. Key parameters considered were the central air jet velocity, jet diameter (and area) acoustic driving frequency, and characteristic jet mixing time. Burner performance was maintained or improved as both jet velocity and jet area were increased approximately as the square root of burner scale. This resulted in increases in the acoustic driving frequency and burner pressure drop with scale, which have implications for development of even larger burners using this technology. Initial development was conducted using simulated low-Btu gas mixtures at ambient temperature. Application as an afterburner required hardware modifications to accommodate higher gas volumes at higher temperatures. Despite significant changes in burner geometry, coherent vortex generation was established by acoustic excitation and continued to effect reductions in NO x and CO emissions. The higher combustion temperatures encountered with hot simulated and real pyrolysis products led to higher CO and NO x emissions, but emission performance continued to exceed applicable regulatory guidelines by a substantial margin.

Fuel cell current generation device for automobile has reformer units inserted between serial fuel cell units

Abstract: The current generation device has a fuel cell unit (1,1a,1b) with one or more solid oxide fuel cells, a reformer unit (6,6a,6b) and an afterburner (14), with the fuel cells and the reformer units connected in alternation and the last fuel cell unit coupled to the afterburner .The reformer units may be fully or partially integrated in the fuel cells.

Fuel cell arrangement with associated auxiliary systems, has exhaust gas line leading to catalytic afterburner that can be electrically heated by electrical output line from fuel cells

Abstract: The fuel cell arrangement has auxiliary systems such as reformers (1) and selective oxidizers (2) and the associated feed and output lines (5,6,7;10) for water, combustion gas, air and exhaust gas. The exhaust gas line (10) leads to a catalytic afterburner (4) that can be electrically heated. The afterburner can be heated by an electrical output line (12) from the fuel cells (3).

Flow Field Calculation and Buckling Analysis for Afterburner

Abstract: WT5”BZ]The flow field calculation and buckling analysis were conducted for the afterburner with a heat shield,flame stabilizer and jet nozzle.The solution domain spanning the entire region between the centerline and the afterburner wall with the heat shield was represented as a blockage to the mesh.The k e model is employed to describe the turbulence characteristics.The EBU Arrhenius combustion model is used to determine the reaction rate.To consider the influence of heat radiation on the gas temperature distribution,a heat flux model is applied to predict the heat flux.The governing equations are integrated by the Hybrid scheme.The SIMPLE solution procedure was used for flow calculations.Predictions are used as aerodynamic and the heat loads for the buckling analysis.The buckling analysis of a cylindrical case simpliflied from a real shaped heat shield is described.The finite element solution applied to calculate the buckling model and the critial load.Compared with the experimental data,the computational results are satisfactory. [WT5”HZ]

Equipment with high temperature fuel batteries

Abstract: The plant (1) contains high temperature fuel cells (20) which are arranged with planar design in a centrally symmetrical stack (2). A supply point (5) is provided for a gaseous or liquid fuel (50). In a reformer (4) following the supply point the fuel can be catalytically converted at least partially into CO and H2 in the presence of H2O and with process heat being supplied. An afterburner chamber (6) follows the output points of the fuel cells (20). A feedback connection (61) exists between the supply point and the afterburner chamber via which the exhaust gas (60', 70') can be fed back to the supply point. In case no gas is provided as a fuel, the supply point comprises a means for feeding in a liquid fuel, such as using an atomizer.

Development of shrouded turbojet to form a turboramjet for future missile applications

Abstract: : Development of shroud to form part of an afterburner for a turbo-ramjet engine which has a possible application for high speed long range missile applications. Research has been conducted on scram-jet engines with little or no emphasis on a turbojet/ramjet combined cycle engines. With the possibility of the turbojet providing the thrust at subsonic conditions and the ramjet providing the thrust at supersonic conditions. A small turbojet engine, the Sophia J450 was evaluated experimentally and the results were compared to the prediction using an industry standard program with a perfect comparison over a wide operating range. In order to study possible turbo-ramjet configurations, a Sophia J450 turbojet engine was used with varying shroud configurations, to compare static thrust and specific fuel consumption measured in a test rig. Shroud pressures were also recorded to determine the entrainment rate of the ducts. The short shroud results were found to produce the best performance of the three configurations tested, which were more significant at lower engine spool speed that produced a sharp increase in secondary entrainment pressure. A conical supersonic intake was designed for combined cycle engine at a Mach 2 flight condition resulting in a near optimum cone angle of 15 (deg) to be tested in the new free jet facility. The flight envelope of the baseline engine was also determined over a wide range of flight speeds and operating altitudes.

Fuel cell operating arrangement has exhaust gas line from fuel cell opening into hollow, perforated air stage afterburner cone surrounded by coaxial fuel nozzles in combustion chamber

Abstract: The arrangement has at least one fuel cell (1) arranged before a reformer and an afterburner (4) connected to a fuel cell exhaust gas line (3) and arranged in a combustion chamber (11) with a heat exchanger (6). The afterburner is an air stage burner, whereby the exhaust gas line from the fuel cell opens into a hollow, perforated cone forming the afterburner and surrounded by essentially coaxial fuel nozzles (10) arranged in the combustion chamber

Electricity generating assembly using fuel combustion

Abstract: The assembly combines the use of a primary fuel such as coal or oil, with a secondary fuel (5) such as sewage sludge, for the generation of electricity from combustion. The assembly has a moving inert bed (3) on which the secondary fuel is gasified. The inert bed forms a gas circulation system together with a smoke gases pipe (4) and a pipe for incoming gas fuel via a pipe (7). A portion of the smoke gases are fed to the inert bed through the smoke gases pipe. Gases emitted from the inert bed are fed via the gas fuel pipe to the burner. The gas pipe incorporates a dust-remover (8) unit preferably a cyclone. The burner has and afterburner (19) supplied by the gas pipe. The inert bed has a tertiary air inlet (6). The burner and/or gas pipe have a secondary air inlet (17). The burner has a heat medium circuit (15) surrendering heat to a waste water treatment plant (18). The heat medium circuit is cooled by a steam circuit heated by the burner.

Vehicle aggregate included in internal combustion engine for reducing vehicle emissions, has afterburner placed after catalyst while fuel reformer feeds fuel to warm up afterburner before starting engine

Abstract: The vehicle aggregate has an afterburner (11) placed after a catalyst (2) while a fuel reformer (3) feeds fuel to warm-up the afterburner before starting an internal combustion engine (1). An Independent claim is also included for reducing vehicle emission from internal combustion engine using vehicle aggregate.