Method and device for recycling liquid nitrogen washing exhaust gas

• Main Authors: ZHANG QIULIN, LIU QIANG, YIN LIANGTAO, JIANG ZHONGCHENG, NING PING, WANG XIAOYONG, YIN ZAIFEI, MOU GANGLIN
• Format: Patent
• Language: Chinese; English
• Published: 23.07.2019
• Subjects: CHEMISTRY; COMPOUNDS THEREOF; FUELS; INORGANIC CHEMISTRY; LUBRICANTS; METALLURGY; NON-METALLIC ELEMENTS; PEAT; PERFORMING OPERATIONS; PETROLEUM, GAS OR COKE INDUSTRIES; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLEGASES CONTAINING CARBON MONOXIDE; SEPARATION; TECHNICAL GASES CONTAINING CARBON MONOXIDE; TRANSPORTING

The invention provides a method and a device for recycling a liquid nitrogen washing exhaust gas and belongs to the field of energy utilization and environmental protection. The method comprises the following steps: boosting and water-cooling the liquid nitrogen washing exhaust gas in turn, thereby acquiring a pretreated liquid nitrogen washing exhaust gas; performing carbon monoxide absorption onthe pretreated liquid nitrogen washing exhaust gas, thereby acquiring a carbon monoxide gas; compressing the carbon monoxide gas and then mixing with a first water vapor and performing high-temperature conversion, thereby acquiring a high-temperature conversion gas, wherein a high-temperature conversion catalyst B118 is applied to the high-temperature conversion; mixing the high-temperature conversion gas with a second water vapor and performing medium-low temperature conversion, thereby acquiring a medium-low temperature conversion gas, wherein a medium temperature catalyst B116 and a low-temperature catalyst B205 a