CIESC Journal ›› 2020, Vol. 71 ›› Issue (5): 2182-2189.doi: 10.11949/0438-1157.20191483

• Process system engineering • Previous Articles     Next Articles

Multi-objective optimization of co-processing of bio-oil and vacuum gas oil in FCC

Le WU(),Jing WANG,Yuqi WANG,Lan ZHENG   

  1. School of Chemical Engineering, Northwest University, Xi’an 710069, Shaanxi, China
  • Received:2019-12-06 Revised:2020-02-26 Online:2020-05-05 Published:2020-03-16
  • Contact: Le WU


As a potential energy source that can partially replace fossil fuels, biofuels have the advantages of green, renewable, and sulfur-free, but their production costs are generally higher. The co-processing of bio-oil and vacuum gas oil in a fluid catalytic cracker (FCC) can effectively reduce the investment cost of a bio-refinery and the production cost of bio-fuels by utilizing the existing equipment in a refinery. To obtain the optimal biomass raw material and bio-oil production technology, Eco-indicator 99 was used to quantify the environmental impacts of the co-processing process, and a multi-objective optimization model was proposed to simultaneously reduce the economic costs and the environmental impacts. The results showed that catalytic pyrolysis was superior to fast pyrolysis in both reducing economic costs and environmental impacts; the different optimal biomasses were obtained under different objectives; biomass cost accounted for the largest proportion of costs and environmental impacts. Therefore, when optimizing the co-processing process, the environmental impact of the process should be considered. Reducing the biomass consumption is the most effective way to reduce both the costs and environmental impacts of the co-processing process.

Key words: biomass, pyrolysis, vacuum gas oil, co-process, FCC, multi-objective optimization, optimal design

CLC Number: 

  • TQ 021.8


Superstructure of the co-processing process"

Table 1

Price and damage factor of biomass, utilities and by-product"


Table 2

Yields of pyrolysis processes/%"








Table 3

Yields of FCC and HDT processes/%"



Feasible solutions for the co-processing process"


Mass balance of the co-processing system with minimum TAC(unit: t·h-1)"

Table 4

Cost and environmental impact composition of the operating scheme with minimum TAC"

项目费用/(MUSD·a-1环境影响/( Mpt·a-1)


Mass balance of the co-processing system with minimum EI and best compromise(unit: t·h-1)"

Table 5

Cost and environmental impact composition of the operating scheme with minimum TAC"


Table 6

Effects of weight factor on the optimal biomass feedstock and pyrolysis technology"

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