Low-temperature carbon capture system based on dry ice melting cold energy recovery and working method

• Main Authors: SONG XIAO, FU BAO, JIANG QINGFENG, CHEN YUPING, FENG HANSHENG
• Format: Patent
• Language: Chinese; English
• Published: 29.11.2022
• Subjects: PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; SEPARATION; TRANSPORTING

The invention discloses a low-temperature carbon capture system based on dry ice melting cold energy recovery and a working method.The system comprises a flue gas treatment system, a drying treatment system, a desublimation and liquefaction treatment system and a refrigerating system and is mainly composed of a dryer, a desublimation device, a solid-liquid separator, a gas-liquid separator and a heat exchanger. Flue gas is cooled by a refrigerant after melting cold energy of dry ice is recovered, enters a dryer for drying, then sequentially exchanges heat with low-temperature clean gas and the dry ice, recovers cold energy, is cooled by the refrigerant to a temperature slightly higher than a desublimation temperature, enters a desublimation device for desublimation to obtain slurry, and is separated in a solid-liquid separator; and the separated dry ice is collected after being subjected to heat exchange melting with the dry flue gas and the wet flue gas in sequence. The dry ice melting cold energy is subject