Combined heat and power generation method and device of solid oxide fuel cell and process heating furnace

Abstract

The invention discloses a combined heat and power generation method and device of a solid oxide fuel cell and a process heating furnace. A fuel and combustion air firstly enter a synthesis gas generator for generating a high-temperature synthesis gas required for power generation of the fuel cell. The generated high-temperature synthesis gas exchanges heat with the air required for an electrochemical reaction of the fuel cell through a heat exchanger, so that the temperature of the synthesis gas and the temperature of the air in galvanic piles both meet the requirements of the power generationof the fuel cell. After the heat exchange, the synthesis gas and the air in the galvanic piles are divided into multiple branches, and each branch leads to the entrance of each galvanic pile to perform the power generation of the fuel cell. Exhausted synthesis gas and exhausted air that have completed the power generation reaction are merged respectively and enter the process heating furnace forcombustion and heat exchange, so as to make full use of the remaining chemical energy and waste heat in the exhausted synthesis gas and the exhausted air. By adopting the combined heat and power generation method and device disclosed by the invention, while the high-level energy in the fuel gas is fully utilized, the waste heat is recovered by the process heating furnace, so that the constructioninvestment of the same project can be greatly reduced, and the economic value of the fuel is greatly improved.

Description

technical field [0001] The invention belongs to the field of fuel cell power generation, in particular to a solid oxide fuel cell (SOFC) power generation system for cogeneration with a petrochemical heating furnace, and in particular to a method for cogeneration of heat and power between a solid oxide fuel cell and a process heating furnace and device. Background technique [0002] A fuel cell is a device that directly converts chemical energy in fuel into electrical energy. Compared with the traditional combustion-based thermal power generation method, it is cleaner and more efficient, and more flexibly applicable to medium and low-scale power generation occasions. Moreover, the solid oxide fuel cell (SOFC) in the fuel cell, because it can be applied to syngas with CO components, has the advantages of high conversion efficiency, all-solid structure, and is suitable for a variety of fuels, it is more suitable for use with other industrial fuel cells. for coupled applicatio...

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Problems solved by technology

However, due to the high investment, high failure rate, and complicated operation switching of gas turbines, this technology has not been widely used in the industry, and it has not been applied to a large number of small and medium-sized heating furnaces.

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