Combined cold-heat-power supplying circulation system driven by solid oxide fuel cell

Abstract

The invention provides a combined cold-heat-power supplying circulation system driven by a solid oxide fuel cell. Pressurized and heated fuel and pressurized and heated water are mixed, and then the mixture reacts with pressurized and heated air in the solid oxide fuel cell so as to generate power; the excess oxygen and unreacted fuel further react; a turbine is used for applying work to drive a power generator to generate power; and then the exhaust preheats air, water and the fuel for refrigeration and heat supply. The combined cold-heat-power supplying circulation system can effectively utilize the high-temperature residual heat of the fuel cell stack and the pressure energy of the fuel, realizes cascaded utilization of energy, and improves the utilization rate of fossil fuel; compared with the traditional power generation efficiency, the total power generating effect of the combined cold-heat-power supplying circulation system can reach more than 70 percent; and in a condition that the refrigerating capacity and the heating capacity are taken into consideration, the overall heat efficiency of the combined cold-heat-power supplying circulation system can reach more than 80 percent which is far higher than that of the general combined cold-heat-power supplying system.

Description

technical field [0001] The invention belongs to the field of medium and low temperature heat energy recovery and power engineering, and relates to a solid oxide fuel cell-driven combined cooling, heating and power circulation system. Background technique [0002] Traditional primary energy reserves such as coal, oil, and natural gas are limited. These fossil fuels are directly used in the form of combustion, which not only has limited efficiency, but also inevitably produces a large amount of pollutants. [0003] Fuel cells can directly convert fuel and oxygen into electrical energy through chemical reactions, and are not limited by the efficiency of the Carnot cycle. They are clean and efficient, and are a new type of power generation method that can better solve the contradiction between fossil fuel power generation efficiency and pollution. [0004] The reaction temperature of solid oxide fuel cells is relatively high, and there is a large space for waste heat utilization...

AI Technical Summary

Problems solved by technology

[0008] The above-mentioned existing combined cooling, heating and power system based on solid oxide fuel cell and organic Rankine cycle directly passes the high-temperature and high-pressure gas discharged from the after-combustion chamber into the waste heat boiler, which does not fully utilize the pressure energy of the gas, and in the boiler 211 It is also necessary to add fuel supplementary combustion, which makes the system complicated

Secondly, the system adopts the back pressure heating method, which cannot coordinate the control of heat load and electric load

In addition, the refrigeration cycle part of the system uses lithium bromide as the working medium, and the refrigeration temperature is limited, which cannot meet the refrigeration needs of users.

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