Study On Modified Metaloxide Of Power Plant CO₂Capture Technology

For excess greenhouse gases emission, the greenhouse effect and global warming become increasingly serious, the capture and separation technology of carbon dioxide has been the focus study in the world. The flue gas produced by power plant is the main emission source of CO2. The captured of the carbon dioxide from flue gas and recycling in the production of soda ash industry will not only reduce the greenhouse effect, but also bring economic value. It is shown that the technology has a very important practical significance.The organized mesoporous alumina (OMA) modified by magnesium nitrate, calcium nitrate, N-(3-aminopropyl)-3-ethoxysilane (APTES) and polyethyleneimine (PEI) was used as the CO2adsorbent. The properties of the adsorption materials before and after surface modification were characterized by X-ray diffraction (XRD), Nitrogen adsorption-desorption instrument, Transmission election microscopy (TEM). The capability of adsorption was tested by adsorption equipment by simulated flue gas.In this thesis, aluminum nitrate was applied as the aluminum source, salvolatile as the precipitant, and polyethylene glycol (PEG1540) as the template agent. The OMAwith high specific surface area, narrow pore size distribution, and organized pore structure was synthesized.. The OMA modified by magnesium nitrate (OMA-Mg), calcium nitrate (OMA-Ca) and APTES/PEI (APTES/PEI-OMA) have improved the surface adsorption property while maintaining the organized pore structure. The effect of the adsorption temperature, gas flow rate and loading capacity to the adsorption capability have been discussed, and the suitable conditions of adsorbing CO2were identified.Compared to the general OMA, adsorption properties to CO2of OMA-Mge and OMA-Ca have been significantly improved with the saturated adsorption quantity respectively of13.02mg/g and10.84mg/g. And it shows better regeneration and adsorption capability with the adsorption quantity of11.41mg/g and9.63mg/g after recycling of absorbing material for6times. PEI/APTES-OMA with the saturated adsorption quantity of84.74mg/g has better adsorption property to OMA-Mg and OMA-Ca. The result of regeneration experiments for6times shows that PEI/APTES-OMA has better regeneration and adsorption capability.On the basis of the experimental results, combining the actual engineering data, the economic evaluation for of PEI/APTES-OMA absorbing CO2from power plant flue gas has been completed. The result shows that this production technology has better economic and social benefits after fully considering carbon benefits. It can be known from the sensitivity analysis that this project has highly sensitivity on CO2sales prices and CO2production.