As a zero-carbon energy source, hydrogen energy has been attracting worldwide attention. At present, the industrialization of hydrogen energy is faced with many key problems, especially the large-scale, low-cost manufacturing and long-distance transportation technologies, which have been the bottleneck problems in the process of hydrogen energy application.
 
Compared with the high-pressure gaseous storage and hydrogen supply mode, the low-temperature liquid storage and supply mode has the advantages of high hydrogen storage proportion (high hydrogen carrying density), low transportation cost, high vaporization purity, low storage and transportation pressure and high safety, which can effectively control the comprehensive cost and does not involve complex unsafe factors in the transportation process. In addition, the advantages of liquid hydrogen in manufacturing, storage and transportation are more suitable for the large-scale and commercial supply of hydrogen energy. Meanwhile, with the rapid development of the terminal application industry of hydrogen energy, the demand for liquid hydrogen will also be pushed backwards.
 
Liquid hydrogen is the most effective way to store hydrogen, but the process of obtaining liquid hydrogen has a high technical threshold, and its energy consumption and efficiency must be considered when producing liquid hydrogen on a large scale.
 
At present, the global liquid hydrogen production capacity reaches 485t/d. The preparation of liquid hydrogen, hydrogen liquefaction technology, comes in many forms and can be roughly classified or combined in terms of expansion processes and heat exchange processes. Currently, common hydrogen liquefication processes can be divided into the simple Linde-Hampson process, which uses Joule-Thompson effect (J-T effect) to throttle expansion, and the adiabatic expansion process, which combines cooling with turbine expander. In the actual production process, according to the output of liquid hydrogen, adiabatic expansion method can be divided into reverse Brayton method, which uses helium as the medium to generate low temperature for expansion and refrigeration, and then cools high-pressure gaseous hydrogen to liquid state, and Claude method, which cools hydrogen through adiabatic expansion.
 
The cost analysis of liquid hydrogen production mainly considers the scale and economy of civil liquid hydrogen technology route. In the production cost of liquid hydrogen, the hydrogen source cost takes the largest proportion (58%), followed by the comprehensive energy consumption cost of the liquefaction system (20%), accounting for 78% of the total cost of liquid hydrogen. Among these two costs, the dominant influence is the type of hydrogen source and the electricity price where the liquefaction plant is located. The type of hydrogen source is also related to the electricity price. If an electrolytic hydrogen production plant and a liquefaction plant are built in combination adjacent to the power plant in the scenic new energy producing areas, such as the three northern regions where large wind power plants and photovoltaic power plants are concentrated or at sea, low cost electricity can be used to electrolysis water hydrogen production and liquefaction, and the production cost of liquid hydrogen can be reduced to $3.50 /kg. At the same time, it can reduce the influence of large-scale wind power grid connection on the peaking capacity of the power system.
 
HL Cryogenic Equipment
HL Cryogenic Equipment which was founded in 1992 is a brand affiliated to HL Cryogenic Equipment Company Cryogenic Equipment Co.,Ltd. HL Cryogenic Equipment is committed to the design and manufacture of the High Vacuum Insulated Cryogenic Piping System and related Support Equipment to meet the various needs of customers. The Vacuum Insulated Pipe and Flexible Hose are constructed in a high vacuum and multi-layer multi-screen special insulated materials, and passes through a series of extremely strict technical treatments and high vacuum treatment, which is used for transferring of liquid oxygen, liquid nitrogen, liquid argon, liquid hydrogen, liquid helium, liquefied ethylene gas LEG and liquefied nature gas LNG.