Molten carbonate fuel cell set with external manifold tube structure

Abstract

The invention relates to a molten carbonate fuel battery group with outer main pipe cylinder structure, belonging to the energy technique. The upper cover plate is above the molten carbonate fuel battery group and connected to the sealing element of carbonate electrolyte; the lower cover plate is under the molten carbonate fuel battery group and connected to the sealing element of carbonate electrolyte; the molten carbonate fuel battery group, the upper cover plate and the lower cover plate are arranged at the center of tow semi-round main pipe cylinder, and via the main pipe sealing element and cover plate sealing elements to connect said two cylinders and form a anode inlet main pipe, a cathode discharge main pipe, a anode discharge main pipe and a cathode inlet main pipe; said two cylinder are connected via the pro-loaded spring, screw, cylinder sealing element and screw cap. The invention can simplify the production of molten carbonate fuel battery group and improve the gas tightness and safety in the operation of said battery group.

Description

technical field [0001] The invention relates to a fuel cell in the field of energy technology, in particular to a molten carbonate fuel cell group with an outer header tube structure. Background technique [0002] A fuel cell is a device that directly converts the chemical energy of fuel into electrical energy without combustion and mechanical transmission, and is not limited by the Carnot cycle. It has the characteristics of no pollution, low noise, and high energy conversion efficiency. Molten carbonate fuel cells can use fuel gases other than hydrogen, such as biomass gas or other renewable energy sources, without using precious metals as catalysts, and can be used as distributed power sources and small power stations. The gas manifold is the channel through which the reaction gas and exhaust gas enter and exit the fuel cell stack. First, the oxidant and fuel gas are distributed to the cathode and anode sides of each single cell after passing through the cathode intake ma...

AI Technical Summary

Problems solved by technology

The so-called internal manifold means that the cathode intake manifold, anode intake manifold, cathode exhaust manifold and anode exhaust manifold are processed on the same sheet as the air channels on the fuel cell bipolar plate, so the internal manifold will cause bipolar plate The processing workload increases, and the processing time is slow; at the same time, in order to machine the gas manifold on the bipolar plate (such as cutting or stamping), it is bound to cause a lot of material to be wasted

[0003] After searching the literature of the prior art, it is found that the U.S. Patent Publication No. 6887611 describes a flexible outer main pipe structure, due to the cathode air intake main pipe, the anode air intake main pipe, the cathode exhaust The plates are separated, only the gas channel is processed on the bipolar plate, and the gas manifold is processed separately. The formed cathode intake manifold, anode intake manifold, cathode exhaust manifold and anode exhaust manifold are respectively installed on the four sides of the fuel cell stack. The corresponding position of each side, therefore, this invention overcomes the shortcoming of material waste when inner main pipe is processed.

However, the disadvantages of this invention are: firstly, although the flexible outer main pipe can adapt to the expansion and contraction in the height direction during the operation of the fuel cell stack to a certain extent, the segmented corrugated structure of the flexible outer main pipe greatly increases the pressure of the main pipe. Difficulty in material selection, processing and installation; secondly, when each header pipe is connected to the fuel cell stack, there are two seals in its height direction. However, since the working temperature of the molten carbonate fuel cell stack is 650°C, When operating at high temperature, increasing the number of seals will greatly increase the possibility of air leakage from each flexible outer main pipe to the outside world

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