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Concentration profile of jet gas in the feed injection zone of a FCC riser
The concentration profiles of jet gas are investigated in the feed injection zone of a cold-model FCC riser by using a hydrogen trace technique.Experimental results demonstrate that four types of jet gas concentration profiles can be used to describe the mixing between the jet gas and pre-lift gas in the feed injection zone.The four types are a distinct M-shaped profile for weak mixing,an indistinct Mshaped profile for medium mixing,a sharp profile for strong mixing,and a parabolic profile for full mixing.The heights for regions of initial and full mixing reduce when decreasing the jet gas velocity or increasing the pre-lift gas velocity.Furthermore,the momentum ratio,Mj/Mr,(where Mj is the momentum of jet gas,Mr is the mixture momentum of pre-lift gas and solid particles) is introduced to describe the effects of gas-solid physical properties,operating conditions,and equipment configuration on the jet gas concentration distribution.The heights for regions of initial and full mixing between jet gas and pre-lift gas are found to be 0-0.375 and 0.375-0.675 m when Mj/Mr ＜ 0.29,0.375-0.675 and 1.075-1.375 m when Mj/Mr ＞ 0.54,and 0-0.375 and 0,675--1.075 m when Mj/Mr between 0.29 and 0.54,respectively....
2020-09-15 12:28:59浏览：77
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通过Hβ分子筛上的烯烃水合反应提高FCC汽油品质
以Hβ分子筛为催化剂,通过烯烃水合反应可以降低FCC轻汽油(≤80 ℃)中烯烃含量并提高含氧化合物含量,从而提高汽油的品质. 在 V(H2O)/ V(oil)=0.6,WHSV=1 h-1,p=5.0 MPa,θ=140 ℃和t=10 h的条件下,FCC轻汽油中烯烃的转化率为16.7%,产物中含氧化合物的含量为9.5%....
2020-03-23 17:45:20浏览：1447
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