Abstract
The efficient utilization of industrial by-products, such as synthetic ammonia exhaust tail gas and coke oven gas, has been neglected in China for a long time. Thus, the development of novel high-efficiency industrial by-product utilization methods is of great importance. A multistage multicycle cascade refrigeration system utilized for hydrogen liquefaction with LNG production is constructed in this paper. The industrial by-products after purification directly enter into cryogenic separation liquefaction system. Liquid hydrogen and LNG are produced after pre-cooling, separation and liquefaction respectively. Process configuration, thermodynamic analysis, optimization model with GA is conducted. The specific power consumption of the multistage multicycle cascade system is within 14.0–17.4 kWh/kmol (feed gas). The proposed process can be used in the efficient utilization of industrial by-products with high exergy efficiency (33.6%∼41.45%) and great economic benefits.
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