【Ten Years of Rapid Development in Chemical Equipment】Plate-and-shell heat exchangers were successfully applied in China’s largest ethane recovery project from 2017 to 2022
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Natural gas is rich in components above C2, and upon recovery, products such as ethane, liquefied petroleum gas, and stable light hydrocarbons can be obtained. Among them, ethane is an excellent raw material for ethylene. This ethane recovery project is the first in China to employ a recovery process for gases with carbon numbers higher than two in natural gas, which combines \"mixed refrigerant pre-cooling + expansion refrigeration + dual-gas subcooling + low-temperature distillation\"; the ethane recovery rate exceeds 92%, and all technical parameters meet international advanced standards. To ensure the smooth implementation of the entire process, and given that high-pressure natural gas is flammable and explosive, the client has set extremely high requirements regarding the heat exchange efficiency of the heat exchangers in various units as well as the reliability of the equipment.
The plate-shell heat exchangers provided by 711 offer a heat transfer efficiency 2-3 times higher than that of traditional shell-and-tube heat exchangers, and their footprint is only 1/3 to 1/5 of that of shell-and-tube heat exchangers, enabling them to meet the requirements for heat exchange in various processes effectively. Meanwhile, laser welding technology is used to connect the heat exchange plates within the core, and it features a pressure-resistant casing; the design life of the entire device is 15 years. Each device undergoes rigorous helium leak testing before leaving the factory, with a leakage rate below 10-7 Pam3s-1.