Hydrogen long-distance transportation system and combined process

Abstract

The invention belongs to the field of hydrogenation and hydrogen production, and provides a hydrogen long-distance transportation system and a combined process. The process comprises the following steps: respectively pressurizing and heating a hydrogen-poor solvent and hydrogen in a hydrogen production place, feeding into a hydrogenation reactor, separating to obtain a hydrogen-rich solvent, transporting the hydrogen-rich solvent to a hydrogen utilization place for a long distance, pressurizing and heating, feeding into a dehydrogenation reactor, separating a reaction product to obtain mixed hydrogen and the hydrogen-poor solvent, purifying the mixed hydrogen to obtain purified hydrogen, and transporting hydrogen-poor solvent back to the hydrogen production place through long-distance transportation. According to the process, the cyclic utilization of a hydrogen-carrying solvent is realized, the hydrogen is in a stable storage state and is easy to transport through low-pressure hydrogenation and dehydrogenation reactions, the generated hydrogen is easy to separate from the system, and compared with a gas hydrogen or liquid hydrogen transportation mode, the process has the advantages of lower investment and good safety.

Description

technical field [0001] The invention belongs to the fields of hydrogenation and hydrogen production, and in particular relates to a long-distance hydrogen transportation system and combined process. Background technique [0002] Today, as the whole society calls for sustainable development and green environmental protection, and under the background of carbon peak and carbon neutrality, new energy has received unprecedented attention. New energy industries such as photovoltaics, green electricity, and green hydrogen have also received strong support and development from the state. [0003] Among them, the development of green hydrogen has received extensive attention, and preparation methods, preparation costs, and low-cost transportation have all become important links restricting the development of green hydrogen. Among them, according to the different states of hydrogen during transportation, the transportation methods of hydrogen can be divided into: gaseous hydrogen (G...

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Problems solved by technology

[0004] In the existing technology, the investment cost of high-pressure liquid hydrogen or ordinary gaseous hydrogen pipeline transportation is very high, which is related to the diameter and length of the pipeline, which is 50% to 80% higher than the cost of natural gas pipelines, most of which are spent on finding suitable , safe route

In addition, for example, the transportation volume of containers and long-tube trailers is small and not suitable for long-distance transportation. The transportation volume of tank cars and railways is large, but the investment is high and the equipment requirements are high, and there are few applications at home and abroad.

[0005] CN112628602A discloses a hydrogen-doped natural gas transportation and separation system and its control method, which is characterized in that hydrogen and natural gas are mixed and transported, and then purified and separated into higher-purity hydrogen, but the volume of hydrogen is larger than that of methane, and the transportation efficiency is low, and Separation of hydrogen and methane is difficult

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