A newly-developed process for LNG cold energy utilization based on middle-low-temperature waste heat recovery

A novel process for the recovery of middle-low temperature waste heat and LNG cold energy was proposed based on exergy analysis. Middle-low temperature waste heat is used as heat source and LNG cold energy is divided into the low-temperature latent cold energy and the high-temperature sensible cold heat. Nitrogen Brayton cycle recovers low temperature latent LNG cold energy, while the ammonia-water Rankine cycle recovers the high-temperature sensible LNG cold heat, whereby the graded use of energy can be realized. The exergy efficiency of LNG cold energy utilization can be effectively improved.