Natural gas melting carbonate fuel cell generation system

Abstract

The power generation system of fuel cell includes three subsystems: adsorption-enhanced subsystem for reforming vapor and methane; fuel cell subsystem of molten carbonate, and subsystem for cyclic utilizing carbon dioxide and tail gas. Through gas inlet pipe and gas outlet pipe, the three subsystems are connected. Combining with MCFC power generation system, the invention uses adsorption-enhanced subsystem for reforming vapor and methane instead of traditional reforming vapor and methane to constitute power generation system of fuel cell of natural gas and molten carbonate. Advantages are: simple system and low energy consumption.

Description

technical field [0001] The invention relates to a power generation system in the technical field of fuel cells, in particular to a natural gas molten carbonate fuel cell power generation system. Background technique [0002] Natural gas, mainly composed of methane, has the highest hydrogen / carbon ratio among hydrocarbons and is one of the energy sources with the highest calorific value among fossil fuels. The pollution of natural gas to the environment is much smaller than that of coal and oil, and the SO released after combustion 2 and NO x Very little, the greenhouse gas CO produced 2 Also less. Therefore, developed countries use natural gas instead of coal and oil as a way to mitigate CO 2 One of the important measures of emissions. The main advantage of using natural gas as the fuel of Molten Carbonate Fuel Cell (MCFC) is that the power generation process is not limited by the Carnot cycle of the heat engine, and the energy conversion efficiency can reach 40% to 60%...

AI Technical Summary

Problems solved by technology

Since the system adopts the traditional steam reforming method to reform natural gas, the structure of the whole system is relatively complex and consumes a relatively large amount of energy; due to the high temperature and high pressure of the reforming reaction, in order to promote the generation of hydrogen and suppress side effects Reaction requires a higher "water-to-carbon ratio". When the water-to-carbon ratio is lower than 3, the side reaction of carbon precipitation is likely to occur on the surface of the nickel reforming catalyst, resulting in a decrease in catalyst activity. However, increasing the "water-to-carbon ratio" will consume more energy. At the same time, due to the limitation of chemical balance, the conversion rate of natural gas cannot be further improved, and the impurity content (CO, CO 2 、CH 4 ) more

In addition, the amount of tail gas (carbon dioxide) after the anode tail gas and cathode tail gas are combusted by the reformer is too small to meet the ratio requirement of MCFC cathode gas (generally air / CO 2 for 7 / 3)

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