Solid oxide fuel cell system, combined power and cooling system and method thereof

Abstract

The invention belongs to the field of active cycles and provides a solid oxide fuel cell system, a combined power and cooling system and a method thereof. Wherein, the solid oxide fuel cell system includes a solid oxide fuel cell, a combustion chamber, a gas turbine, a first mixer, a second mixer and a pre-reformer; the cathode and the anode of the solid oxide fuel cell are connected to the combustion chamber, The heat output from the combustor provides energy for the gas turbine, and the gas exhausted by the gas turbine is used as a heat source for preheating air, methane and water; the first mixer is used to mix the gas drawn from the cathode output of the solid oxide fuel cell and the preheated Air before being sent to the cathode input of the SOFC; a second mixer is used for the gas drawn from the anode output of the SOFC and preheated methane and water before passing through the pre-reformer Delivered to the anode input of the solid oxide fuel cell.

Description

technical field [0001] The invention belongs to the field of active cycles, and in particular relates to a solid oxide fuel cell system, a combined power and cooling system and a method thereof. Background technique [0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art. [0003] Solid Oxide Fuel Cell (Solid Oxide Fuel Cell, referred to as SOFC) belongs to the third-generation fuel cell, which is an all-solid-state device that directly converts the chemical energy stored in fuel and oxidant into electrical energy in an efficient and environmentally friendly manner at medium and high temperatures. Chemical power plant. It is generally considered to be a fuel cell that will be widely used in the future like the proton exchange membrane fuel cell (PEMFC). A general SOFC power generation system includes a fuel processing unit, a fuel cell power generation unit, and an energy rec...

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Problems solved by technology

[0004] The inventors found that adopting internally reformed SOFC (Solid Oxide Fuel Cell) electric stacks would cause the internal temperature distribution of the electric stack to be very uneven, and the temperature gradient would be very large, which would cause uneven stress on the electric stack materials and rupture; The fuel utilization rate of the SOFC in the backflow mode is low, so that the mass flow rate of air and fuel will be large, resulting in a large power consumption of the compressor and an increase in the exergy loss of the preheater; The lower the gas temperature, the lower the specific exergy available for the bottom cycle

The inventor also found that the traditional ammonia water power cycle or ammonia water refrigeration cycle can only obtain a single demand, and even if the two cycles are used as low-temperature waste heat at the same time, the equipment will increase and the investment cost will increase; without the recovery of supercritical CO 2 When the heat dissipation of the condenser is high, when the maximum thermal efficiency is obtained, the condenser will remove a large amount of heat and cause a large amount of exergy loss, and the economy is not high.

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