Abstract
The combustion characteristics of co-firing bio-oil produced from the fast pyrolysis process of coffee bean residue and diesel in a 300-kWth oil-fired furnace are investigated. Using bio-oil to completely replace fossil fuels has limitations since bio-oil has undesirable properties, such as high water and oxygen contents, high viscosity, and low heating value. However, a low blend ratio of bio-oil used as a substitute for petroleum-derived oil has advantages; i.e., it can be easily combusted in existing furnaces without modifications. Thus, a promising solution is the partial substitution of diesel with bio-oil, rather than completely replacing it. A furnace test is performed for diesel alone and bio-oil/diesel blends with 5 vol % bio-oil. The results show that excellent stable combustion is observed during the co-firing test. Compared with diesel, with 5 vol % bio-oil content in the blends, both the wall temperature and gas temperature drop only slightly and exhibit similar furnace temperature distribution; meanwhile, comparable NO emissions (smaller than 57 ppm) are obtained, and lower CO2 emissions are achieved because biomass is both carbon neutral and renewable. Moreover, SO2 and CO emissions under these two burning conditions are very low; SO2 and CO emissions are smaller than 6 and 35 ppm, respectively.
Highlights
Biomass is one of the most commonly used forms of renewable energy around the world
A combination of a high and low emulsifier is more effective than the use of study, we found that the emulsion of fast pyrolysis bio-oil (FPBO)/diesel with HLB 9.9 results in the highest stability when a single emulsifier
After the5pre-heating the was switched to the fuelsprocess, to perform diesel fuel was switched to the the optimum test fuels operating
Summary
Biomass is one of the most commonly used forms of renewable energy around the world. It is a C-based organic material that primarily comes from plants such as crops and wood and from byproducts such as agricultural waste. The utilization of biomass energy provides a number of benefits compared to fossil fuels, especially those related to environmental aspects, since biomass is a renewable and CO2 -neutral fuel [1]. Pyrolysis is a thermal decomposition process of organic materials that occurs through the application of intense heat in the absence of oxygen, leading to the production of biogas, bio-oil, and biochar. Thermochemical conversion of lignocellulosic biomass into bio-oil through fast pyrolysis process is considered one of the promising routes to replace conventional fossil oil [3].
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