Heat-power coordinated supply system and method integrating fuel cell and carbon dioxide circulation

Abstract

The invention provides a heat-power coordinated supply system integrating a fuel cell and carbon dioxide circulation. The heat-power coordinated supply system comprises the solid oxide fuel cell and a power converter. An air preheater and a mixer are connected with the cathode and the anode of the solid oxide fuel cell correspondingly. A fuel preheater and a water supply preheater are connected with the mixer. Waste gas of the solid oxide fuel cell is connected with an afterburner. Part of heat of waste gas exhausted by the afterburner is used for supplying heat to thermal loads, part of heat of the waste gas exhausted by the afterburner is used for supplying heat to the air preheater, the fuel preheater and the water supply preheater, and another part of heat of the waste gas exhausted by the afterburner is used for being transferred to a carbon dioxide working medium of a supercritical carbon dioxide circulation loop, so that power is generated through supercritical carbon dioxide circulation. The invention further provides a heat-power coordinated supply method integrating the fuel cell and carbon dioxide circulation. According to the heat-power coordinated supply system and method, advantages of the solid oxide fuel cell and supercritical carbon dioxide circulation are combined, heat-power coordinated supply is achieved, the system is simple, the structure is compact, the energy utilization rate is high, cost is low, and the system and method are suitable for distributed energy sources.

Description

technical field [0001] The invention relates to a combined heat and power system and method integrating a solid oxide fuel cell and a supercritical carbon dioxide cycle, and belongs to the technical field of distributed energy sources. Background technique [0002] A fuel cell is a power generation device that directly converts chemical energy stored in fuel and oxidant into electrical energy. The solid oxide fuel cell belongs to the third-generation fuel cell and is currently the most promising type of fuel cell. Solid oxide fuel cells have a high operating temperature (800-1000°C), power generation efficiency of over 60%, can use a variety of fuels, have less pollutant emissions, and are small in size, which is very suitable for distributed energy. Due to the high working temperature of the solid oxide fuel cell, the exhaust gas temperature can be as high as 800°C, and the exhaust gas temperature can reach above 1000°C after burning the residual fuel in the afterburner, so...

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Problems solved by technology

The solid oxide fuel cell and gas turbine hybrid power generation system has a relatively complex structure, high fuel cell operating pressure, and h

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