A small and medium-scale distributed natural gas steam reforming hydrogen production system and method

Abstract

A small and medium-scale distributed natural gas steam reforming hydrogen production system, including an integrated natural gas steam reforming hydrogen production reactor main body and peripheral auxiliary systems; the integrated natural gas steam reforming hydrogen production reactor main body is made of raw materials Water evaporator, natural gas preheater, combustion chamber, reforming chamber, reformed gas cooler, combustion flue gas waste heat cooler, reformed gas waste heat cooler, and fuel burner are composed of eight main components. A hydrogen production method for a small and medium-scale distributed natural gas steam reforming hydrogen production system. After multi-stage preheating, raw natural gas and water enter the reforming chamber inside the integrated reactor for steam reforming reaction. The invention has the advantages of improving the energy utilization rationality and energy utilization efficiency of the whole system; realizing the high efficiency and compactness of the reforming hydrogen production system; the operation mode is highly selectable, flexible and convenient.

Description

technical field [0001] The invention relates to the field of hydrogen production by steam reforming of natural gas, in particular to a small and medium-scale distributed hydrogen production system and method by steam reforming of natural gas. Background technique [0002] As a clean energy carrier, hydrogen can be easily converted into electricity and heat due to its matching and compatibility with all current energy systems, high energy conversion efficiency and the ability to realize CO 2 It is possible to achieve sustainable circulation and supply that does not rely on fossil energy. The upsurge of hydrogen energy development began with the accelerated development of fuel cells at the end of the last century. The starting speed of the fuel cell is fast, the power density is high, and the environment is friendly. It is very suitable for use as a portable power supply, a small mobile power supply, a vehicle power supply, a backup power supply, an uninterruptible power supp...

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Problems solved by technology

However, the power of the Micro-CHP involved in the above-mentioned patent is only about 700-750W, which belongs to the micro fuel cell combined heat and power system, and the amount of hydrogen fuel required is small (less than 1Nm 3 h 2 / h scale), so the scale of the reactor is relatively small. Under this scale, it is reasonable to adopt the single-layer, multi-layer sleeve type or flat plate structure design in the above-mentioned patents in terms of integration, heat transfer efficiency, and difficulty in processing and assembly. of

And for small and medium scale (10-1000Nm 3 h 2 / h scale) for the purpose of providing hydrogen source for PEMFC, SOFC and natural gas reforming hydrogen production system used in hydrogen refueling stations, continue to adopt the above-mentioned single-layer, multi-layer sleeve type or flat plate structure design in terms of heat transfer efficiency, There are many limitations in the temperature distribution of the reaction bed, the control of local hot spots in the reactor, the difficulty of scale-up processing, and safety.

Sichuan Yalian High-Tech Co., Ltd. cooperated with Tsinghua University to develop a small-scale natural gas steam reforming device. By designing the long reformer tube into the inlet section, the middle section and the gas outlet section, the reformer can effectively reduce the tube length, but the whole device still has a height of 3-4m, for a 50Nm 3 h 2 / h scale hydrogen production system is still a bit large

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