Year-end Sale % OFF 
Abstract
Thermodynamic performance of three conceptual systems for biomass-derived olefin production with electricity cogeneration was studied and compared via exergy analysis at the levels of system, subsystem and operation unit. The base case was composed of the subsystems of gasification, raw fuel gas adjustment, methanol/light olefin synthesis and steam & power generation, etc. The power case and fuel case were designed as the combustion of a fraction of gasification gas to increase power generation and the recycle of a fraction of synthesis tail gas to increase olefin production, respectively. It was found that the subsystems of gasification and steam & power generation contribute ca. 80% of overall exergy destruction for each case, of which gasifier and combustor are the main exergy destruction sources, due to the corresponding chemical exergy degrading of biomass and fuel gas. The low efficiency of 33.1% for the power case could be attributed to the significant irreversibility of the combustor, economizer, and condenser in the combined-cycle subsystem. The effect of the tail gas recycle ratio, moisture content of feedstock, and biomass type was also investigated to enhance system exergy performance, which could be achieved by high recycle ratio, using dry biomass and the feedstock with high carbon content. High system efficiency of 38.9% was obtained when oil palm shell was used, which was 31.7% for rice husk due to its low carbon content.
Highlights
Light olefins, mostly derived from steam cracking of naphtha, have versatile applications with annual production of 230 million tonnes globally [1]
Three alternative configurations were designed as base case, power case and fuel case
The subsystems of gasification and steam and power generation contribute 39.4–47.2% of exergy destruction ratio for each case, which mainly derives from the destruction of chemical exergy in the gasifier and combustor respectively
Summary
Mostly derived from steam cracking of naphtha, have versatile applications with annual production of 230 million tonnes globally [1]. Since the pilot projects for methanol or dimethyl ether production have been demonstrated [7,8], a tandem process via biomass gasification, methanol synthesis and MTO could be a potential approach for the substitutable light olefin production. The other two modifications of the base case were as follows: (1) the combustion of a fraction of gasification gas to increase electricity production (power case); (2) the recycle of a fraction of synthesis tail gas to increase methanol/light olefins production (fuel case). The 3seofn1s9itivity analysis of the recycle ratio of synthesis tail gas, the moisture content of the feedstock and biomass type on system performance, which were critical for the product proportion betwteheenseonlesiftiinvsityanadnaelylescistroicf itthye, rwecaysclseturadtieodo.fAsytntthheessiasmtaeil tgiams,et,hreomugohistaunrenucoanltseanlteosfwtheere calculfaeeteddstoackcoarnddinbgiotmoadsisffteyrpeenotnpsryicsetesmcepnearrfioorsmoafneclee,cwtrhicicihtywaenrde corlietifcianl pforrotdhuecptsro. Tail gases from PSA and methanol synthesis are combusted for heat and steam generation
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
