Characteristics study of efb briquettes and its potential use as dual fuel in cvcc

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Date
2018-05
Authors
Mohammad Fairuz Abd Rahman
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As a renewable energy, biomass has potential to replace depletion of fossil fuel for automotive and power generation applications. In this study, empty fruit bunch (EFB) is used as a biomass source to become the producer gas to test into constant volume combustion chamber (CVCC). The limitations of fibrous biomass have low bulk density from 80-100kg/𝑚3 that give difficulties to store and transport. One of the methods to improve the biomass characteristic by using the densification process or called briquetting. Roller press machine was used in briquetting process to convert the EFB into pillow-briquette. The pillow-briquettes is based on EFB characterized at different percentage of water and binder of tapioca starch. But the briquetting process was failed due to fibrous biomass need more compression to become a briquette. So, manually briquette has been done which provide more compaction pressure of 100 kPa compared to pillow briquetting machine of 40 kPa. The manual briquetting used a mold that compacting with hammer to produce cylindrical briquette with new composition of water and binder. The quality characteristic such as compressive strength and calorific value of EFB has been done via compressive load test and calorimeter test. Based on the result obtained, EFB briquette with composition of mixture 120%W and 30%S has the highest calorific value which is 17.394 MJ/kg and highest maximum compressive load which is 939.66 N. This process should further to produce the producer gas from EFB briquette to supply into the CVCC but there is some constraint that cannot be avoided. In this study, the producer gas that had been replaced by liquified petroleum gas (LPG) to run in the CVCC with diesel to identify the spray and combustion characteristic. The visualization technique to measure the macroscopic spray characteristic such as spray tip penetration, spray cone angle and spray width. The injection pressure of diesel was varied from 60 MPa to 100 MPa and injected to the CVCC with combusted LPG. Tip penetration of 100 MPa and 80 MPa have the same value which is 57 mm due to maximum radius of CVCC but spray cone angle of 100MPa has the highest value which is 11.7mm thus affected the widest width of spray. In addition, the injection pressure of 100MPa of diesel produced biggest yellow flame.
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