Abstract
N-(2-Hydroxyethyl) piperazine (HEPZ) has a chemical structure similar to PZ and has less volatility. It is not easy to volatilize in a continuous operation device. It is studied to replace PZ as a promotor to increase the CO2 capture rate. This paper researches the lowest energy consumption and absorbent loss of HEPZ/H2O in the absorption-regeneration process, and compares it with another five amines, including PZ, MEA, 1-MPZ, AMP and DMEA. Based on the thermodynamic model, this work establishes a process simulation based on the equilibrium stage, assuming that all stages of the absorption and desorption towers reach thermodynamic equilibrium and CO2 recovery in the absorption tower is 90%. By optimizing the process parameters, the lowest thermodynamic energy consumption and absorbent loss of process operation are obtained. Our results show that HEPZ as a promotor to replace PZ and MEA has significant economic value. The lowest reboiler energy consumption of HEPZ with the optimal process parameters is 3.018 GJ/tCO2, which is about 35.2% lower than that of PZ and about 11.6% lower than that of MEA, and HEPZ has the lowest solvent loss. The cyclic capacity is 64.7% higher than PZ and 21.6% lower than primary amine MEA.
Highlights
There are three main types of CO2 capture technologies: oxy-fuel combustion, pre-combustion capture and post-combustion capture. Compared with the former two, the post-combustion capture technology has the slightest modification to coal-fired power plants, and the lowest cost of transformation and the operation of the power plant
Since the measured concentration of the CO2 solubility data of the HEPZ solution used for regression modeling was up to
The concentrations studied for HEPZ were 5, 15 and 30 wt.%
Summary
There are three main types of CO2 capture technologies: oxy-fuel combustion, pre-combustion capture and post-combustion capture Compared with the former two, the post-combustion capture technology has the slightest modification to coal-fired power plants, and the lowest cost of transformation and the operation of the power plant. Among the methods for capturing CO2 from flue gas of coal-fired power plants, amine scrubbing has been successfully applied in ammonia production and natural gas processes [4]. The energy penalty associated with solvent regeneration is the largest contributor to operating costs [3]. This is the biggest challenge to post-combustion capture still in need of a solution
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