Exhaust gas recycling device of fuel cell

Abstract

The invention discloses an exhaust gas recycling device of a fuel cell, and belongs to the field of fuel cells. The exhaust gas recycling device comprises a hydrogen storage tank, a galvanic pile, a heat exchanger, a heat conversion device, a gas-water separator, a drying tower and a compressor, wherein hydrogen in the hydrogen storage tank is introduced into the galvanic pile for electrochemical reaction to generate electric energy, and the remaining hydrogen exhaust gas enters the heat exchanger for heat recovery, sequentially passes through the gas-water separator, the drying tower and the compressor and finally enters the hydrogen storage tank; air is introduced into the galvanic pile for electrochemical reaction to generate electric energy, and the remaining air exhaust gas enters the heat conversion device and provides the heat conversion device with heat; and a high-temperature medium generated by the heat conversion device enters the drying tower to provide heat for absorbent regeneration and returns to the heat conversion device again after heat supply. By the exhaust gas recycling device of the fuel cell disclosed by the invention, the residual fuel and heat in the exhaust gas of the fuel cell are fully recycled, so that improvement of the fuel utilization rate of the fuel cell is facilitated; energy is saved; the power generation efficiency is improved; and the cost is reduced.

Description

technical field [0001] The invention relates to the field of fuel cells, in particular to a fuel cell tail gas recovery and utilization device. Background technique [0002] With the rapid development of the global economy, human demand for energy is increasing, and problems such as environmental pollution and resource shortage are becoming more and more prominent. Facing the problems of high pollution and low energy efficiency of traditional thermal power generation, fuel cells greatly reduce the loss in energy conversion and damage to the environment. s concern. [0003] A fuel cell is a power generation device that directly converts the chemical energy of fuel into electrical energy through an electrochemical reaction. The product is water, which fundamentally eliminates pollution such as sulfide, carbide, and dust. The working principle of the fuel cell can be regarded as the reverse reaction of electrolysis of water. Hydrogen and air are used as reaction gases to unde...

AI Technical Summary

Problems solved by technology

However, the drying capacity of the adsorbent will gradually decrease, and when the adsorption saturation is reached, it no longer has the drying capacity, and the moisture in the adsorbent needs to be removed through the regeneration process to restore the drying capacity

The regeneration process consumes heat

[0005] The theoretical efficiency of fuel cells can reach more than 80%, but the actual efficiency is only 50%-60%, of which 20%-40% of fuel is wasted

On the other hand, the operating temperature of the fuel cell is relatively high, and the exhaust gas still contains a lot of heat, which is also wasted with the exhaust gas.

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