Various configurations of a power plant are described. The power plant is configured to supply power to a receiving electrical grid by the combustion of metal powder. The power plant is also configured absorb power by recovering the metal powder from the metal oxide produced by the combustion of the metal powder, with electricity from a source electrical grid.

Provided are systems and methods for propulsion and powering systems using recyclable metallic fuels. The method includes capturing fuel products, including a metal oxide and unburnt fuel from combustion of a metallic fuel, storing the unburnt metallic fuel and the fuel products to generate power and/or thrust, and recycling the metal oxide to recreate the metallic fuel and/or byproducts. A system for propulsion and power generation using a metallic fuel includes a combustion chamber for combusting the metallic fuel to provide propulsion, a reaction chamber for generating electricity and thermal power using heat from unburnt metallic fuel and fuel products, a storage system for capturing the unburnt metallic fuel and the fuel products and at least one recycling system for directing the captured unburnt metallic fuel and/or the fuel products to the combustion chamber and/or the reaction chamber.

A material is utilized with an electropositive metal. This can be used as post-oxyfuel process for oxyfuel power stations. Here, an energy circuit is realized by the material utilization. An electropositive metal, in particular lithium, serves as energy store and as central reaction product for the conversion of nitrogen and carbon dioxide into ammonia and methanol. The power station thus operates without CO.sub.2 emissions.

A material is utilized with an electropositive metal. This can be used as post-oxyfuel process for oxyfuel power stations. Here, an energy circuit is realized by the material utilization. An electropositive metal, in particular lithium, serves as energy store and as central reaction product for the conversion of nitrogen and carbon dioxide into ammonia and methanol. The power station thus operates without CO.sub.2 emissions.

A method is provided for combustion of an electropositive metal using a combustion gas. The electropositive metal, in the form of a fluid or powder having particles with a particle size of less than 100 ?m, is drawn out of a container by atomizing a carrier gas in a first nozzle, which tapers in relation to the cross-section in the flow direction of the carrier gas. The electropositive metal is drawn out of the container into the first nozzle, atomized out of said nozzle and combusted using the combustion gas.

A method is provided for combustion of an electropositive metal using a combustion gas. The electropositive metal, in the form of a fluid or powder having particles with a particle size of less than 100 ?m, is drawn out of a container by atomizing a carrier gas in a first nozzle, which tapers in relation to the cross-section in the flow direction of the carrier gas. The electropositive metal is drawn out of the container into the first nozzle, atomized out of said nozzle and combusted using the combustion gas.

A combustion apparatus of this invention comprises: a heat-resistant container having an opening in its upper part; and a pot with a fire-extinguishing lid, provided with a fire-extinguishing lid which can open and close the opening in the upper part of the heat-resistance container, closes the opening with the fire-extinguishing lid by hand, vibration, or impact, and receives a fuel dropped from the heat-resistant container.