Natural gas hydrogen preparation and proton-exchange film fuel cell integrated generation method and device thereof

Abstract

The invention discloses a natural gas hydrogen preparation and proton-exchange film fuel cell integrated generation method and a device thereof. The high-temperature fluid side of a fourth heat exchanger of the device is respectively connected with the high-pressure side of a film separator and a pressure adjusting valve; the low-temperature fluid side is connected with a pipeline between a compressor and a third heat exchanger; the high-temperature fluid side of the third heat exchanger is respectively connected with a fuel gas outlet and an exhaust pipe of a reforming reactor, and the low-temperature fluid side is respectively connected with the compressor and the inlet of the reforming reactor. The invention utilizes hydrogen-preparing raw material gas harmless to the proton-exchange film fuel cell, namely the natural gas, as blowing gas at the inner side of a palladium film and decreases the partial pressure of the hydrogen at the inner side of the film so as to improve the hydrogen partial pressure difference inside and outside the film and improve the whole generation efficiency of the natural-gas reforming hydrogen preparation system and the fuel cell integrated generation system. The invention has simple design, good system heat match and high energy utilization rate and provides a new technological method for the natural gas reforming palladium film hydrogen preparation and proton-exchange film fuel cell integrated generation.

Description

Technical field: [0001] The invention relates to a process for producing hydrogen from natural gas and a proton exchange membrane fuel cell for integrated power generation, in particular to a process and a device for separating and producing CO-free hydrogen by using a palladium membrane. Background technique [0002] Since the end of the 20th century, fuel cell technology has developed rapidly. A fuel cell is an efficient energy conversion device that converts chemical energy into electrical energy, and its discharge is water, which will not cause harm to the environment. Currently, the most mature fuel cell technology is the proton exchange membrane fuel cell, which has very strict requirements on the content of CO in the hydrogen source (CO < 10 ppm). If high-purity hydrogen that meets the needs of proton exchange fuel cells can be produced on a small scale, a key problem in the popularization and application of current fuel cell technology can be solved. Small-scale...

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Problems solved by technology

[0004] The present invention aims at the problem that a large hydrogen partial pressure difference is required on both sides of the palladium membrane and the operation cost is relatively high in the process of using the palladium membrane to separate hydrogen production and the integrated power generation of the fuel cell, and provides a high overall power generation efficiency and high energy utilization efficiency. Method and device for integrated power generation of natural gas hydrogen production and proton exchange membrane fuel cell

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