High pressure fossil fuel oxy-combustion system with carbon dioxide capture for connection with an energy conversion system

摘要

A combustion system (5) for its operative connection with an energy conversion system, in which the energy conversion system is a closed Brayton cycle system, the combustion system comprising: (i) a combustion unit constructed and arranged for selective operation at combustion pressures that exceed the supercritical pressure of carbon dioxide (7.38 MPa) and which comprises a burner (10), in which said burner must produce high pressure combustion gases that they supply thermal energy, indirectly, by means of a first heat exchanger (120, 220) towards a separate energy conversion system, in which said thermal energy is transferred to said energy conversion system without direct current connection with said burner (10) and said high pressure combustion gases are not expanded to convert forms of energy, as they pass through the first heat exchanger ( 120), the burner (10) (a) presenting at least one combustion chamber; (b) a fuel inlet (14), to indirectly extract combustible energy from the high pressure combustion gases, constructed and arranged to receive a fuel feed at a pressure that exceeds the selected combustion pressure; (c) an oxygen inlet (12) constructed and arranged to receive an oxygen supply and at a pressure that exceeds the selected combustion pressure; (d) an inlet (16) for the intake of carbon dioxide constructed and arranged to receive an independent supply of non-recycled supercritical carbon dioxide back to the burner at a pressure that exceeds the selected combustion pressure; (e) at least one outlet (18) of combustion products defining an outlet flow path of the burner to direct the combustion products towards the first heat exchanger (120, 220); and (f) at least one input (44) for recirculation of the combustion products stream arranged in the burner (10); (ii) an oxygen supply unit operatively connected to the oxygen inlet (12); (iii) a fuel supply unit operatively connected to the fuel inlet (14); (iv) at least one first heat exchanger (120, 220) constructed and arranged for the operative connection with the energy conversion system to indirectly feed thermal energy to said energy conversion system, which has an input region, a discharge region and at least a first flow passage defining a flow path between the inlet region and the discharge region for combustion products received from the burner; (v) an outlet (24) of the heat exchanger after the first heat exchanger (120, 220) for combustion gases, comprising a flow passage; (vi) a recirculation loop (40) operatively connected to said at least one recirculation input (44) of the combustion products current and comprising at least one circulation pump (42), said circulation pump located , after the first heat exchanger (120, 220), intended to circulate the flow of combustion products; and (vii) a combustion discharge unit operatively connected to the discharge region of the first heat exchanger (120, 220) for the elimination of combustion products and comprising (a) a divider (38) for division of combustion products into the recirculation stream (40) and an exhaust stream (48); (b) a recirculation current supply unit operatively connected to the recirculation input (44); and c) an exhaust current supply unit operatively connected to the combustion exhaust unit.