Summary |
Using the RPB as the equipment of absorption, its volume required is only one third of the packed bed. Instead of the single RPB of absorption, we use two RPBs in series of absorption and one RPB of regeneration in continuous operations. With the operation advanced, it can not only increase the capture amount but also reduce the regeneration energy. We use PZ and NaADS as our formulation. Compared with MEA, the capture amount of our formulation can increase by 16.2% and the regeneration energy can reduce by 31.8% in continuous operations of CO2 absorption and absorbent regeneration using RPBs. |
Scientific Breakthrough |
Using the RPB as the equipment of absorption, it can not only increase the mass transfer rate but also allow higher gas inlet and handle higher viscosity absorbent than packed bed. With the same capture efficiency, the volume of RPB is only one third of the packed bed. Compared with the operation of single RPB of absorption, using MEA of 30 wt% in continuous operations of two RPBs in series of absorption can allow more treated gas and increase the capture amount by 44.8%. After two times of absorption, the cycle loading of the absorbent can increase by 39.8%; as a result, the regeneration energy can decrease by 21.6%. In addition to the high reaction rate of NaADS, it still possesses low vapor pressure and high thermal stability. Due to these properties, NaADS can save the cost of the loss of absorbent in continuous operation. Besides, adding NaADS to the formulation can decrease the saturated dissolved oxygen to reduce the oxidative degradation. We use PZ and NaADS as our formulation. Compared with MEA, the capture amount of our formulation can increase by 16.2% and the regeneration energy can reduce by 31.8% in continuous operations of CO2 absorption and absorbent regeneration using RPBs. Besides, the saturated dissolved oxygen of our formulation can reduce by 68.7%. The capture amount of CO2 is 9.19 kg per day in our lab. The scale of CO2 capture operation in our lab was scaled up to the demonstration plant in China Steel, capturing CO2 of 0.1 ton per day. The demonstration plant in Formosa Petrochemical Corporation with automation equipment can capture 1.0 ton CO2 per day with the capture efficiency above 95%. Before the degradation of the absorbent happened, the regeneration energy can reach 2.5 GJ/ton CO2. We have been established the demonstration plant in Chang Chun Group, capturing CO2 of 0.1 ton per day. |