Page 34 - 全球能源互联网资讯-第10期（12月）-英文

Overview

is simpler and more stable than using fossil energy, storage and transportation of hydrogen. Under the
and the product gas does not contain pollutants or premise that the total amount of resources is not
harmful gases, which is especially suitable for small constrained and the preparation cost is controllable
and medium scale hydrogen production, but the in the medium and long term, the storage
production cost is significantly affected by the price performance and transport efficiency of hydrogen
of methanol, and the cost of hydrogen production is are the bottleneck problems in the construction of
obviously high. hydrogen energy network.
Industrial by-product hydrogen production is a Currently, hydrogen storage mainly consists of
hydrogen production process that uses hydrogen- gas storage, liquid storage, and solid storage. High-
rich end wastes or by-products as raw materials pressure gaseous hydrogen storage is the main
for recovery and purification using pressure swing hydrogen storage method at present because of
adsorption (PSA) in the process of industrial its advantages such as fast filling and discharging
production. Currently about 30% or more of the by- of hydrogen and simple container structure.
product hydrogen is emitted directly and is not used Liquid hydrogen storage has the advantage
effectively. of high hydrogen storage density, but its one-
Electrolytic water based hydrogen production time investment of the device is large. Its energy
means inserting positive and negative electrodes into consumption in the liquefaction process is high, and
water and connecting to direct current, hydrogen there is a certain evaporation loss in the storage
ions in water will precipitate hydrogen by reduction process. The liquid organic hydrides formed after
reaction at the cathode. The technology equipment is hydrogen storage and hydrogenation is stable in
simple, the process is stable, the generated hydrogen property and of high safety, but there exist some
is extremely pure, and no pollution is produced at problems such as high reaction temperature and low
the same time, but the disadvantage is high energy dehydrogenation efficiency. Solid hydrogen storage
32 consumption and high cost per unit of hydrogen has the advantages of high hydrogen storage density,
production. low hydrogen storage pressure, good safety, and
To distinguish the cleanliness (carbon emission) high hydrogen discharge purity. Its volume hydrogen
of the hydrogen production pathway, we call the storage density is higher than that of liquid hydrogen,
hydrogen obtained from renewable energy sources but it has the problems of high temperature and poor
“green hydrogen”
of electrolytic water as , which is cycling performance.
produced with zero carbon emissions, and hydrogen
produced from fossil energy sources by methane
steam reforming or autothermal reforming as.
“grey hydrogen”
Grey hydrogen has lower cost, but
higher carbon intensity. The hydrogen produced by
the addition of carbon capture and storage (CCS) Currently, the cost
to methane steam reforming and autothermal of hydrogen delivery is
reforming is known as “blue hydrogen” . Blue much higher than the cost of
hydrogen can reduce carbon emissions, but it cannot gasoline and diesel at the same
eliminate all carbon emissions. energy level. From the perspective
At present, the use of renewable energy sources of hydrogen selling price structure,
such as wind and solar power, followed by it is mainly composed of hydrogen
electrolysis to produce hydrogen can greatly reduce raw materials, production and
the cost of hydrogen production, which is the current transportation costs of hydrogen,
research hotspot in the field of hydrogen production, fixed and variable costs of hydrogen
with technical feasibility and economic advantages. filling stations, and operation and
maintenance of hydrogen filling
Storage and transportation: Urgently need stations.
to improve efficiency
The important characteristic that distinguishes the
hydrogen from chemical battery is the large-scale

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