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Recently, the commissioning of key units for Shandong Yulongdao gasification hydrogen production project was carried out. The units that succeeded in this test run are two large-scale exhaust gas compressors. It is worth noting that the exhaust gas compressor is crucial for coal-based hydrogen production facilities; this project uses three multi-nozzle gasifiers, with two in operation and one as a backup. Furthermore, according to the environmental impact assessment document for the Yulong Island refining and chemical integration project, which was made public by the Ministry of Ecology and Environment in July 2020, the coal-to-hydrogen production process for this project involves multi-nozzle water-coal slurry gasification, three-stage sulfur-tolerant shift reaction, low-temperature methanol washing to remove acidic gases, and PSA for hydrogen purification. The production capacity is 260,000 m³/h for hydrogen and 200,000 m³/h for fuel gas. It is understood that coal-based hydrogen production technology has a history of 200 years, and in China it has been around for nearly 100 years. There are two methods for producing hydrogen from coal: one is the coking of coal (also known as high-temperature dry distillation), and the other is coal gasification. Among them, gasification of coal for hydrogen production involves first gasifying coal to produce gaseous products primarily composed of H2 and CO, and then obtaining hydrogen of a certain purity through processes such as purification, CO shift and separation, and purification.