Synthesis Of C-H-O Symbiosis Network In Eco-industrial Park

Process industry consumes large amount of resources,in the same time it produces a series of adverse environmental effects.Reducing the generation of wastes and the recycling of resources has attracted increasing world-wide attention.Eco-industrial parks can achieve the cooperative utilization and rational distribution of resource among multiple enterprises,and have become a major trend of chemical industry.To promote the resource conservation and enhance the symbiotic relationship in the park,it is crucial to establish the coupling system of resource in eco-industrial parks.So far,most of the works on mass integrated network are carried out specific species,such as water and hydrogen.This paper presents a methodology for the optimal design of C-H-O Symbiosis Network,to explore the potential of mass conservation in eco-industrial park.Based on the superstructure of C-H-O Symbiosis Network,economy and safety design approach are employed to solve the problem through mathematical programming.?1?One of the key technologies for saving resources and reducing waste emissions is process integration.It achieves maximum design efficiency by utilizing the least amount of mass and energy and maximizing the recovery of mass and energy.Discussing the overall design method of C-H-O symbiosis network.?2?For the process design problem need consider the economics factor,Quantitative evaluation of economic impact is the basic premise of process economic performance evaluation.This paper discusses the existing evaluation indices of the economic impact of chemical process in the conceptual design stage.The economic factors are integrated into the process synthesis for the selection of the process scheme with better economy.The ROI of the interceptor network investment rate was selected as the objective function.By incorporating the yield constraint of interceptor network into the optimization model,the existing economic optimization model of C-H-O symbiosis network was improved to be more consistent with the actual production,and a C-H-O symbiosis network with excellent economy was designed.The interceptor network consists of three interceptor units,synthesis of methanol from syngas,conversion of water gas,and dry reforming of methane.Before the optimized design,the annual CO₂ emission of the park was 1158t/a,and the optimized CO₂ emission was zero.The purchase price of raw materials in the industrial park was reduced to 33%.The process simulation software ASPEN PLUS was used to optimize the parameters of the interceptor unit.When methanol synthesis pressure was within 7.3mpa and water-gas conversion feed water-carbon ratio was within 1.0-1.8,ROI and SASWROIM obtained better values.?3?This paper presents a method of synthesis of C-H-O Symbiosis Network considering i-safety indice.A structural representation method is developed to embed potential C-H-O Symbiosis Network configurations of interest.Then,an optimization formulation is devised.Through the comparative study of different inherent safety indices,an optimization model of?NLP?with the minimum value of the inherent safety indices i-safe is established.The obtained safety optimal interception network consists of only three interception units,which are water gas conversion unit,methane dry reforming unit and carbon dioxide methanol synthesis unit.The i-safe indicator average OSI=19.?4?A multi-objective optimization model with minimum economic index FCI and safety index i-safe as objective function was constructed considering both economic benefit and process safety.Based on this model,the weighted analysis method was introduced to determine the weight of each target.By dimensionless processing of each target,the multi-objective optimization problem is transformed into a single-objective optimization problem,the software LINGO was used to solve the optimization problem.The results show that the optimized interception network consists of only three interception units,which are carbon dioxide methanation unit,syngas methanol unit and methane dry reforming unit.Its economy and safety weighted index value M=0.097.