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A method and system is provided for combusting a fuel having application to a heat consuming device such as a boiler or furnace or a reactor. An oxygen-containing stream is introduced into one or more oxygen transport membranes subjected to a reactive purge or a sweep gas. The oxygen transport membr

A method and system is provided for combusting a fuel having application to a heat consuming device such as a boiler or furnace or a reactor. An oxygen-containing stream is introduced into one or more oxygen transport membranes subjected to a reactive purge or a sweep gas. The oxygen transport membrane(s) can advantageously be subjected to a reactive purge or a sweep gas passing in a cross-flow direction with respect to the membranes to facilitate separation of the oxygen. In case of a reactive purge, temperature control of the oxygen transport membrane(s) is effectuated by the use of a suitable heat sink. Further, the oxygen transport membranes can be arranged in a row and be connected in series such that retentate streams of ever lower oxygen concentrations are passed to successive oxygen transport membranes in the row. The fuel or sweep gas can be introduced in a direction counter-current to the bulk flow of the retentate streams.

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A method and system is provided for combusting a fuel having application to a heat consuming device such as a boiler or furnace or a reactor. An oxygen-containing stream is introduced into one or more oxygen transport membranes subjected to a reactive purge or a sweep gas. The oxygen transport membr

A method and system is provided for combusting a fuel having application to a heat consuming device such as a boiler or furnace or a reactor. An oxygen-containing stream is introduced into one or more oxygen transport membranes subjected to a reactive purge or a sweep gas. The oxygen transport membrane(s) can advantageously be subjected to a reactive purge or a sweep gas passing in a cross-flow direction with respect to the membranes to facilitate separation of the oxygen. In case of a reactive purge, temperature control of the oxygen transport membrane(s) is effectuated by the use of a suitable heat sink. Further, the oxygen transport membranes can be arranged in a row and be connected in series such that retentate streams of ever lower oxygen concentrations are passed to successive oxygen transport membranes in the row. The fuel or sweep gas can be introduced in a direction counter-current to the bulk flow of the retentate streams. is accumulated in melted state; and to start operating when the predetermined temperature is attained, allowing for supply of said melted metal material; and the supply of metal material after the predetermined temperature is attained is performed while gradually supplying and agitating, maintaining metal material of at least 6 times of a maximum injection volume for said mold accumulated in a melted state. 2. A material supply and melting method for use in injection molding of molten metal and for supplying granular metal material from a supply apparatus into a cylindrical melting vessel, said vessel provided with: a weighing chamber communicating with a nozzle member in an extremity thereof; a rotatable agitation member inside and an injection means having an injection plunger, on the extremity portion thereof, inserted advanceably and retractably into a center portion of the agitation means, said injection plunger being slidably engaged with the weighing chamber, said method comprising the steps of: melting the metal material by an external heat; accumulating, weighing, then injecting and charging the metal material into a mold by said injection means to mold a metal article; wherein the operation speed and time of said supply apparatus are controlled so that (1) the supply of said metal material during the molding operation and (2) the weighing of said metal are sequential, thereby maintaining the accumulation amount and temperature of molten metal in the melting vessel constant at all times. 3. The material supply and melting method in injection molding of melt material of claim 1; wherein said supply apparatus is controlled so that the supply of said metal material during the molding operation starts when the molten metal surface level is lowered to a lower limit of a predetermined level range, by monitoring and detecting a variation of the molten metal surface level by a liquid level sensor during an agitation operation of molten metal accumulated in the melting vessel by said agitation means, and stops when an upper limit is attained, thereby maintaining the accumulation amount and temperature of molten metal in the melting vessel constant at all times. 4. The material supply and melting method in injection molding of melt material of claim 2; wherein said said supply apparatus is controlled so that the supply of said metal material during the molding operation starts when the molten metal surface level is lowered to a lower limit of a predetermined level range, by monitoring and detecting a variation of the molten metal surface level by a liquid level sensor during an agitation operation of molten metal accumulated in the melting vessel by said agitation means, and stops when an upper limit is attained, thereby maintaining the accumulation amount and temperature of molten metal in the melting vessel constant at all times. ning gas is controlled in such a way that the combustion of the carbon fraction of the carbon carrier in fine particle form takes place in a proportion of at least 40% to form CO2,whereby the volatile hydrocarbons given off by the coal are converted in an oxidizing manner. 2. Process according to claim 1, characterized in that the combustion of the carbon fraction of the carbon carrier in fine particle form takes place in a proportion of at least 50% to form CO2. 3. Process according to claim 1 characterized in that the combustion of the carbon fraction of the carbon carrier in fine particle form takes place in a proportion of at least 70% to form CO2. 4. Process according to claim 1 characterized in that the pulverized-fuel burners are aligned in such a way that a gas-mixing turbulent flow is generated in the dome space by the burner flames. 5. Process according to claim 1 characterized in that, for generating a gas-mixing turbulent flow, the pulverized-fuel burners are aligned along lines extending askew in the same sense with respect to the vertical central axis of the fusion gasifier. 6. Process according to claim 1 wherein said iron-containing material in lump form is partly or fully reduced iron sponge.