Study On Recovery Of Carbon Dioxide From Flue Gas By Simulation

Fossil fuels such as coal, oil, natural gas is widely used, the resulting huge amounts of carbon dioxide, this has gone far beyond the acceptable level of nature. Therefore, how to reduce the concentration of carbon dioxide in the atmosphere, reducing emissions of carbon dioxide, is a common problem faced by human. Recycling CO₂ in flue gas is not only the most direct and effective means to ease carbon dioxide emissions crisis, but also can reduce the production cost.Using HYSYS software, this paper respectively build a model for the absorption, desorption and the whole process of CO₂ capture in flue gas, which laid a foundation for absorbent optimization and process optimization. Simulate the absorption process with MEA, DEA, TEA, MDEA, DIPA, DGA and ammonia, and analysis the effects of reaction temperature and absorbent concentration on the absorption and absorption rate.Two-amine mixed solutions absorption characteristic, including MEA-MDEA, DEA-MDEA, DGA-MDEA and DIPAMDEA, was simulated. And analysis the effects of reaction temperature and absorbent concentration on the two-amine mixed solutions absorption and absorption rate. The available energy of capture system and regeneration energy been analyzed by calculate.Simulation and analysis on the relationship between flue gas temperature, CO₂ load, absorption, absorption rate and the flow rate, temperature and concentration of barren liquor. Simulation and analysis on the relationship between the barren liquor temperature, desorption rate and the load and pressure of the reboiler. Simulation and analysis on the relationship between reboiler load, barren liquor flow rate, mixed amine mass fraction and CO₂ recovery. Finally, determined the optimal absorbent and operation parameters.This paper mainly simulate the mixed amine of MEA- MDEA absorb CO₂, and compared with other mixed amine systems. Through analyzing the experiment may get he best operation parameters. The conclusion is that the best absorption temperature is 40 degree, reboiler load is 7500 kW, the mass fraction of mixed amine is 10%MEA- 10%MDEA, the circulation flow of absorbent is 115m3/h,the best desorption temperature is 110 to 120 degree.