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

A technology for reforming hydrogen and natural gas, applied in electrical components, fuel cells, electrochemical generators, etc., can solve heat transfer efficiency, temperature distribution, hot spot control, amplification processing difficulty, safety, reduce reformer tube length, reactor Small scale and other problems, to avoid high temperature thermal stress, improve the rationality of energy utilization, and save consumption

Active Publication Date: 2018-12-18
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Application Information

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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

Method used

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

Examples

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Embodiment 1

[0038] A distributed small and medium-sized natural gas steam reforming hydrogen production and SOFC combined system such as figure 2 shown. When the system is started, the normal temperature fuel methane and air are mixed into the burner to ignite and burn to generate high-temperature flue gas, which flows upward through the shell side of the central cavity of the integrated reactor (R101), preheating the reforming reaction tubes equipped with the reforming catalyst, The high-temperature flue gas turns back at the upper end of the R101 central cavity and enters the flue gas waste heat cooler in the central layer of the R101 jacket downwards to preheat the raw materials methane and water for the reforming reaction. The combustion flue gas after heat exchange is finally discharged out of the boundary through the combustion tail gas outlet at the bottom of R101. When the temperature of the methane preheater and water preheater reaches 200°C, the raw material methane and water ...

Embodiment 2

[0040] A distributed small and medium-sized natural gas steam reforming hydrogen production and PEMFC combined system such as image 3 shown. The technological process and operating parameters of the integrated reforming reactor R101 starting up and reaching normal operation are the same as those in Example 1. After the system reaches a normal operating state, the reformed product gas flows out from the top of R101 and enters the reformed gas waste heat evaporator H101 to continue preheating part of the raw water. Continue to enter the CO purification system consisting of two-stage CO water-steam shift unit, four-stage CO selective oxidation unit and interstage heat exchanger for reaction, so that the CO concentration in the reformed product gas is reduced to below 10ppm, and the reformed product gas Air temperature drops to 60-80°C. The product gas continues to enter the PEMFC anode for battery reaction to generate electricity. PEMFC anode tail gas contains 20-30% H 2 , t...

Embodiment 3

[0042] A distributed medium and small natural gas steam reforming hydrogen production system combined with a Pd membrane hydrogen separator such as Figure 4 shown. The technological process and operating parameters of the integrated reforming reactor R101 starting up and reaching normal operation are the same as those in Example 1. After the system reaches the normal operation state, the reformed product gas flows out from the top of R101 and enters the reformed gas waste heat evaporator H101 to continue preheating part of the raw material water. The temperature of the reformed product gas flowing out of H101 is 400-550°C. After the gas is pressurized to 2.5 MPa, it continues to enter the Pd membrane hydrogen separator to obtain pure hydrogen with a purity of 99.9%. The retentate gas of Pd membrane hydrogen separator contains 20-30% H 2 , the retentate gas enters H102 and V101 in turn for cooling, dehydration, and then enters R101 bottom burner for combustion, providing hea...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/0606
CPCY02E60/50
Inventor 苏宏久袁中山王树东李德意倪长军李德伏
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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