The reporter learned from the national pipeline network that the first full-scale hydrogen-doped natural gas pipeline in China, the leakage and explosion test in the closed space was successfully implemented a few days ago. It fills the gap in the verification test of hydrogen doping and explosion of long-distance natural gas pipelines in China, and lays a foundation for the independent and controllable hydrogen doping transportation technology of long-distance natural gas pipelines.

For the first time in China, a pipeline discharge jet fire test on a natural gas pipeline mixed with hydrogen, as well as a video footage of the leakage and explosion test in a closed space were released. In this experiment, a 323.9 mm pipe diameter pipeline was selected, and the maximum hydrogen doping ratio was 30%, which was the largest pipeline hydrogen-doped natural gas explosion test in China.

Peng Shiyao, Senior Engineer of the New Energy Storage and Transportation Research Center of the General Research Institute of the State Pipeline Network Group: The test determines the acceptable proportion of hydrogen doping and transportation in the pipeline by obtaining parameters such as explosion pressure, flame temperature and length in the closed space, and provides data support for the establishment of a safety standard system for hydrogen-doped natural gas pipelines.

Experts told reporters that hydrogen and natural gas are different in nature, and after natural gas pipelines are mixed with hydrogen, it will bring a series of safe operation problems to pipes, valves and other equipment. Doing such an explosion test is to provide data support for the large-scale hydrogen transportation of natural gas pipelines in the future.

The so-called natural gas pipeline hydrogen transportation is actually to mix hydrogen and natural gas in different proportions, and then use the existing natural gas pipeline network for transportation. Hydrogen-doped natural gas can be used directly, or hydrogen and natural gas can be separated and used separately. At present, the proportion of natural gas hydrogen blending utilization in China is 3%, and the highest proportion of natural gas hydrogen blending transportation in some countries in Europe and the United States has reached 20%.

Li Yuxing, professor of China University of Petroleum (East China): Long-distance, large-diameter, high-steel grade and high-pressure pipeline transportation is the development trend of hydrogen energy supply in the future.

By the end of 2022, the total mileage of China's oil and gas pipelines has exceeded 18,20 kilometers. Based on the current consumption of natural gas in China, when the hydrogen blending ratio reaches 1000%, more than <> million tons of hydrogen can be consumed, which can solve the problem of resource misallocation and peak regulation demand in the east and west of China.

What is Hydrogen Energy?

When it comes to hydrogen, we may all feel both strange and familiar, and many people's memories of the impression of hydrogen are still stuck in the balloons they played with when they were children, or the molecular formula in chemistry textbooks, to understand hydrogen↓

Hydrogen is the most widely distributed substance in the universe because it must be produced from hydrogen-containing substances such as water and fossil fuels, and is therefore a secondary energy source.

According to the formation process of hydrogen energy, we generally divide hydrogen energy into gray hydrogen, blue hydrogen and green hydrogen. Grey hydrogen is mainly produced by the combustion of fossil fuels such as coal and natural gas, and there are emissions such as carbon dioxide during the production process. Currently, the vast majority of hydrogen on the market is grey hydrogen, accounting for about 95% of global hydrogen production today. Blue hydrogen refers to hydrogen produced from fossil fuels using carbon capture measures, and the carbon emission intensity is greatly reduced. Green hydrogen, on the other hand, refers to hydrogen obtained by splitting water from renewable energy.

China is accelerating the layout of the hydrogen energy industry

Considering the unique advantages of hydrogen energy, in recent years, China has accelerated the development of hydrogen energy industry. A number of breakthroughs have been made in hydrogen energy preparation, storage and transportation, and infrastructure construction.

At present, the hydrogen energy industry in the Yangtze River Delta, Guangdong-Hong Kong-Macao Greater Bay Area, and Bohai Rim is showing a trend of cluster development. In terms of technological innovation in hydrogen energy, China has mastered a number of advanced technologies in water electrolysis hydrogen production devices, storage and transportation equipment and fuel cells, and high-end equipment is gradually being introduced to the market. In terms of hydrogen energy production, renewable energy hydrogen production projects have been actively promoted in North China and Northwest China, and the cost of hydrogen production by water electrolysis has been steadily reduced.

Lin Weibin, Director of the Energy Policy Research Office of the China Energy Research Society: China has the world's largest installed capacity of renewable energy, and by 2030, the installed capacity of renewable energy hydrogen production may exceed 1 million kilowatts. By 2060, green hydrogen production is likely to approach 1 million tonnes. Including our installed capacity of hydrogen energy to generate electricity, it is possible to exceed 1 million kilowatts.

It is precisely to see the future development prospects of the hydrogen energy industry, at present, more than one-third of the central enterprises have been laying out the whole industrial chain including hydrogen production, hydrogen storage, hydrogen refueling, hydrogen use, etc., and accelerating the breakthrough of key materials and core technology equipment bottlenecks in the whole hydrogen energy industry chain. It is predicted that by 2030, China's hydrogen demand will reach 3715.5 million tons, accounting for about 500% of final energy consumption, and renewable hydrogen production will be about <> million tons. (CCTV News Client)