Nowadays, hydrogen energy is gradually becoming one of the important carriers for China and even the world's energy transformation and development, and is an important lever for achieving the dual carbon goals, which is highly expected. As a result, China has gradually introduced various support policies for hydrogen energy. The national level "Medium - and Long Term Plan for the Development of Hydrogen Energy Industry (2021-2035)" has been released, involving strategic positioning, technological innovation, infrastructure construction, policy guarantees, and many other aspects. Many provinces and cities have introduced policies or plans related to hydrogen energy.
Although hydrogen is the most abundant substance in the universe, it rarely exists alone and generally only exists in combination with other chemical elements, such as water that combines with oxygen and organic compounds that combine with carbon, such as natural gas. So, obtaining hydrogen requires physical or chemical methods. Although the final composition of hydrogen is the same, hydrogen can be divided into five types based on its production source and carbon emissions: gray hydrogen, blue hydrogen, green hydrogen, green hydrogen, and red hydrogen.

Gray hydrogen refers to hydrogen gas produced through fossil fuels, industrial by-products, etc., accompanied by a large amount of carbon dioxide emissions. Gray hydrogen is currently the mainstream hydrogen gas, accounting for approximately 95% of global hydrogen production. About 70% of grey hydrogen comes from the combustion of fossil fuels, and about 30% is a byproduct of industrial processing. Grey hydrogen is mainly used for internal demand, that is, directly for hydrogen production sites.
Blue hydrogen is a hydrogen gas produced by capturing, utilizing, and sequestering carbon dioxide by-products (CCUS) on the basis of grey hydrogen, and is an important stage in the transition from grey hydrogen to green hydrogen. Although blue hydrogen can reduce carbon emissions by about 90%, the storage of carbon dioxide requires relatively rare geological conditions, which limits the development of blue hydrogen.
Green hydrogen is a liquid produced by pyrolysis of solid carbon and polymer by-products on the basis of grey hydrogen, without emitting any gases containing carbon elements. Blue hydrogen, green hydrogen, and green hydrogen are all listed as environmentally friendly and clean hydrogen.
Green hydrogen is hydrogen gas produced through electrolysis after generating electricity from renewable energy sources such as solar or wind power. The main technological route for producing green hydrogen is electrolysis of water, which can achieve net zero carbon emissions.
Red hydrogen is a hydrogen gas produced on a large scale using abundant water as raw material and nuclear energy. Thermochemical cycle technology and high-temperature steam electrolysis are both advanced hydrogen production processes that are expected to be coupled with nuclear energy.
Among the five sources of hydrogen mentioned above, due to the limitations of the hydrogen production process, there are more or less impurities (solid: dust, rust; gaseous: oxygen) and excess water vapor present. The hydrogen dehydration closed cycle process developed by Hangzhou Linuo Machinery is specifically designed for the continuous separation or removal of impurities and water vapor from compressed hydrogen gas.

Undried hydrogen gas is first passed through a preheated palladium catalyst device to undergo a hydrogen oxygen reaction, producing water and separating the oxygen. Then, in a closed cycle, the water in high-purity hydrogen gas is absorbed by an adsorption tower, and the adsorbent is desorbed by temperature swing adsorption (TSA). This process not only effectively reduces the pressure dew point of hydrogen gas, thereby reducing the chance of water condensation when hydrogen gas is pressurized, but also keeps the entire system dry, keeping the pipeline away from corrosion.

                                      Zero gas consumption hydrogen explosion-proof dryer

Hangzhou Linuo has been focusing on gas drying for decades, among which our company's most advantageous products include zero gas consumption drum heat dryer, zero gas consumption compressed heat dryer, zero gas consumption three tower dryer, and special gas explosion-proof dehydration dryer. They are suitable for removing water, oil, and dust from various gases and working conditions, effectively and thoroughly solving the troubles caused by low-quality gases to users. At the same time, it has also played a huge role in emerging industries and processes such as hydrogen energy, new energy batteries, chip manufacturing, decarbonization processes, carbon sequestration, and household waste treatment (biogas power generation).