Investigation On CO₂ Capture Properties Of Sorbent Pellets Modifed Through Typical Inert Support?Mg-based,Al-based?

To solve the problems about the poor anti-sintering performance and cycle stability of Ca-based sorbent pellets,a number of scientific problems about that Ca-based sorbent pellets modifed through typical inert support?Mg,Al?had been studied in this thesis.To study the sorbent pellets modified through Mg-based insert support,three routines of pellets preparation were studied including soaking,mechanical mixing and simultaneous hydration-incorporation.It was found that the sorbent pellets produced via simultaneous hydration-incorporation possess the best cyclic sorption performance.In addition,the content of incorporated MgO significantly affects the cyclic CO₂ capture performance of sorbent pellets.The pellets introduced to 25 wt.%MgO display the highest conversion of66.39%,which is approximately 1.52 times that of the pellets introduced to 5 wt.%MgO after25cycles.Moreover,theMgO-incorporatedpelletspreparedvia extrusion-spheronization possess the high capability to resist attrition.In the end,the effect of SO₂ existence during the carbonation stage on on their cyclic CO₂ capture performance of sorbent pellets.It was found that the introduction of SO₂ resulted in the quickly decline of the CO₂ capture performance of sorbent pellets.To study the sorbent pellets modified through Al-based insert support,the sorbent pellets prepared by wet mixing similar to simultaneous hydration-incorporation in this thesis.The effect of Al-based content on the CO₂ sorption performance of pellets had been also studied in this paper.The result indicates that the more Al-based inert solid support that is introduced,the better the CaO conversion.Afterwards,three common biomass power?wheat,willow and halm?had been chosen to study the effect of the kinds of biomass on CO₂capture performance of sorbent pellets.It was found that the addition of three kinds of biomass can effectively improve the pore structure of the sorbent pellets,therefore,enhancing CO₂ capture performance of sorbent pellets.And three kinds of biomass modification capacity is similar.In addition,the effect of the existence of CO₂ during calcination stage on the CO₂sorption performance of pellets had been studied in this thesis.The result indicates that the existence of CO₂ during the calcination stage has a negative impact on the CO₂ sorption performance of the sorbent pellets.At last,the antiattrition of the prepared sorbent pellets were also studied in this paper.The mass loss of all the adsorbent samples after 1 000 rpm rotation test was below 1%.The weight losses of all sorbent pellets after 3000 rotations are less than 1%,and the result indicates that the sorbent pellets prepared in this thesis have a good mechanical properties.