SOFC (Solid Oxide Fuel Cell) combined heat and power system for improving heat efficiency and optimizing water management

Abstract

The invention relates to an SOFC (Solid Oxide Fuel Cell) combined heat and power system capable of improving heat efficiency and optimizing water management, which is characterized in that combustion tail gas sequentially preheats air, reforming reaction, fuel, reforming water and domestic water, so that the comprehensive recycling of energy and water contained in the combustion tail gas is realized, the water and heat management of the system is optimized, and the thermoelectric efficiency of the system is effectively improved. According to the system, the assembly layout and the heat exchange process are optimized, the waste heat recovery heat exchanger and the condenser are additionally arranged, heat energy in tail gas is recovered through cooling water, and external heat supply is achieved; by additionally arranging the water storage tank, the circulating pipeline and the electromagnetic control valve, water in tail gas can be recycled. Water and heat management in the system operation process can be optimized, the heat efficiency of the system is greatly improved, the water consumption of the system is reduced, and the operation cost is reduced.

Description

technical field [0001] The invention relates to the technical field of SOFC combined heat and power system operation, in particular to a SOFC combined heat and power system that improves thermal efficiency and optimizes water management. Background technique [0002] SOFC (Solid Oxide Fuel Cell) is a new, high-efficiency, high-temperature fuel cell with good fuel adaptability and low pollutant emission, which has broad application prospects in distributed power generation systems and mobile power sources. [0003] SOFC is a high-temperature fuel cell, the core working temperature is usually between 700-800 ℃, and the temperature of the stack exhaust gas can generally reach above 750 ℃, and contains some fuel gas that has not been fully reacted. The stack exhaust gas is burned to supply heat to the reformer, and after heat exchange with the incoming gas, part of the heat in the combustion exhaust gas is recycled, and the final exhaust temperature can be reduced to about 400 °...

AI Technical Summary

Problems solved by technology

However, the dew point temperature of the exhaust gas after combustion is generally lower than 60°C, and the latent heat of evaporation of water in the exhaust gas cannot be effectively recovered. Effective recovery and utilization of this part of energy can greatly improve the thermal efficiency of the system

[0004] On the other hand, when carbon-based fuel is used as the fuel of the SOFC system, the fuel needs to be reformed before entering the stack, and the reforming process consumes a large amount of water

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