System and method for providing supercritical steam

A method for providing supercritical steam, the method comprising:

• generating steam via combusting a first fuel in a first boiler;
• heating the generated steam from the first boiler in a second boiler fluidly connected to the first boiler via combustion of a second fuel that is different from the first fuel, wherein the combustion of the second fuel by the second boiler produces a flue gas, wherein the flue gas flows from the second boiler to the first boiler;
• disposing a heat exchanger in the second boiler to heat the steam to a supercritical steam temperature, and fluidly connecting the heat exchanger to the first boiler via a conduit, wherein the generated steam flows from the first boiler to the second boiler and the heat exchanger;
• directing the supercritical steam from the heat exchanger to a steam turbine generator fluidly connected to the second boiler, wherein the steam turbine generator consumes the supercritical steam to produce power;
• fluidly connecting a reheat conduit to the first boiler, the second boiler, the heat exchanger and the steam turbine generator, wherein the reheat conduit returns steam consumed by the steam generator to the first boiler, the second boiler and the heat exchanger for reheating the consumed steam for reuse by the steam turbine generator, wherein the reheat conduit provides the reheated steam from the second boiler and the heat exchanger to the steam turbine generator, wherein the steam turbine generator receives the reheated steam along with the supercritical steam provided from the heat exchanger.

A downstream boiler for providing supercritical steam, the downstream boiler comprising:

• a combustion chamber configured to generate heat by combusting a first fuel;
• a heat exchanger disposed in the combustion chamber and fluidly connected to an upstream boiler that generates steam by combusting a second fuel that is different from the first fuel, wherein the heat exchanger heats the generated steam from the upstream boiler to a supercritical steam temperature;
• a flue gas conduit that fluidly connects the combustion chamber to the upstream boiler such that a flue gas produced via combustion of the first fuel is brought into heating-contact with an economizer of the upstream boiler or a feed water line of the upstream boiler;
• a steam conduit that fluidly connects the heat exchanger to a steam turbine generator, wherein the steam conduit carries the supercritical steam to the steam turbine generator for consumption and production of power;
• a reheat conduit fluidly connected to the upstream boiler, the combustion chamber, the heat exchanger and the steam turbine generator, wherein the reheat conduit returns steam consumed by the steam generator to the upstream boiler, the combustion chamber, and the heat exchanger for reheating the consumed steam for reuse by the steam turbine generator, wherein the reheat conduit provides the reheated steam from the heat exchanger to the steam turbine generator, wherein the steam turbine generator receives the reheated steam along with the supercritical steam provided from the heat exchanger.