Economic and Life Cycle Assessments of Integrating Gasification Unit into Production Unit of Pellet from Fallen Leaves and Twig. Issue 1 (April 2021)

• Record Type: Journal Article
• Authors: Abdul Rahman, Fadil; Utomo, Gendewa; Purwadi, Indra; Susanto, Herri
• Is Part Of: IOP conference series. Volume 1143:Issue 1(2021)
• Publication Date: 2021-04
• Subjects: Materials science -- Periodicals; 620.1105
• DOI: 10.1088/1757-899X/1143/1/012033
• Languages: English
• ISSNs: 1757-8981

Abstract

Abstract: Conversion of fallen leaves and twigs from urban waste into pellets may be one of several options to reduce the amount of waste transported to the landfill. However, the production of pellet needs very high mechanical energy or electricity. A case study has been conducted to evaluate the advantages and disadvantages of integrating a gasification technique into the production unit. In this integrated unit, the source of electricity for the pellet production was based on the conversion of a portion of pellet product to gaseous fuel which was then used as substitute of diesel fuel for running an electricity generator set. Three scenarios for supplying the electricity were compared: (i) scenario-A: from PLN (national grid, coal fired power plant), (ii) scenario-B: diesel-generator set; and (iii) scenario-C: diesel-genset and gasification unit. Total CO2 emissions in the production of pellet were as follows (kg CO2 eq /ton pellet): 81.8, 47.2 and 16.3 for scenario-A, B and C respectively. Due to the addition cost of investment, the integrated pellet production and gasification unit needed a Payback Period of about 5.6 years, while those of diesel based electricity and PLN were 5.1 and 4.8 years respectively. Data for this study was obtained from experiments on a pellet production unit with a design capacity of about 9 ton/week. The diesel engine was run in dual fuel mode using producer gas from the gasification of pellet. The producer gas heating values were in the range of 3300-4600 kJ/Nm 3 . Oil saving in dual fuel operation was up to 70%.