Combustion of agro-waste with coal in a fluidized bed

Date

2010-02-01

Author

Atımtay, Aysel

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In this study, a review of the studies done on the co-combustion of some agro-waste in a bubbling fluidized bed combustor (BFBC) having an inside diameter of 102 mm and a height of 900 mm is given. The agro-waste used to investigate the co-combustion characteristics were peach and apricot stones produced as a waste from the fruit juice industry, and olive cake produced as a waste from the olive oil industry. These are typical wastes for a Mediterranean country. A lignite coal was used for co-combustion. On-line concentrations of O(2), CO, CO(2), SO(2), NO (x) and total hydrocarbons (C (m) H (n) ) were measured in the flue gas during combustion experiments. Variations of emissions of various pollutants were studied by changing the operating parameters (excess air ratio, fluidization velocity and fuel feed rate). Temperature distribution along the bed was measured with thermocouples. Emissions were also monitored from the exhaust. Various combinations of coal and biomass mixtures were tested. During the combustion tests, it was observed that the volatile matter from the biomass quickly volatilizes and mostly burns in the freeboard. The temperature profiles along the bed and the freeboard also confirmed this phenomenon. It was found that as the volatile matter of the biomass increases, combustion takes place more in the freeboard region. Better combustion conditions occur at higher excess air ratios. The results showed that co-combustion with these three proposed biomasses lowers the SO(2) and NO (x) emissions considerably. CO and hydrocarbon emissions are lower at the higher excess air ratios.

Subject Keywords

Biomass combustion, Olive cake, Peach and apricot stone combustion, Bubbling fluidized bed combustion

URI

https://hdl.handle.net/11511/30614

Journal

CLEAN TECHNOLOGIES AND ENVIRONMENTAL POLICY

DOI

https://doi.org/10.1007/s10098-009-0220-9

Collections

Graduate School of Natural and Applied Sciences, Article

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Emission characteristics of co-combustion of a low calorie and high-sulfur-lignite coal and woodchips in a circulating fluidized bed combustor: Part 2. Effect of secondary air and its location VAROL, MURAT; Atımtay, Aysel; OLGUN, HAYATİ (2014-08-15) In this study, co-combustion of woodchips and Bursa-Orhaneli lignite was carried out in a circulating fluidized bed combustor, 6 m long and 108 mm inside diameter. Co-combustion of lignite and woodchips was performed in order to investigate the effect of secondary air ratio (SAR) on the flue gas emissions. The woodchips content of the fuel mixture was 30% and 50% by wt. Secondary air (SA) was supplied to the combustor from five different locations along the combustor and at several SARs. During the combusti...
Investigation of co-combustion of coal and olive cake in a bubbling fluidized bed with secondary air injection Atımtay, Aysel (2009-06-01) In this study, a bubbling fluidized bed of 102 mm inside diameter and 900 mm height was used to burn olive cake and coal mixtures. Tuncbilek lignite coal was used together with olive cake for the co-combustion tests. Combustion performances and emission characteristics of olive cake and coal mixtures were investigated. Various co-combustion tests of coal with olive cake were conducted with mixing ratios of 25%, 50%, and 75% of olive cake by weight in the mixture. Operational parameters (excess air ratio, se...
Investigation of combustion characteristics of biomass and coal mixtures in a circulating fluidized bed combustor Varol, Murat; Atımtay, Ayse; Department of Environmental Engineering (2013) In this study, combustion and co-combustion tests of Bursa/Orhaneli lignite with two biomass fuels (olive cake and woodchips) were carried out in a laboratory scale Circulating Fluidized Bed (CFB) combustor, 6 m high and 108 mm inside diameter, in order to investigate the effect of excess air ratio (l), secondary air ratio (SAR) and location of secondary air injection along the combustor wall on the emissions. Optimum l and SAR was determined for each test. The flue gas emissions were compared with limits i...
Co-combustion of peach and apricot stone with coal in a bubbling fluidized bed Atımtay, Aysel (2008-02-01) In this study a bubbling fluidized bed combustor (BFBC) having an inside diameter of 102 mm and a height of 900 mm was used to investigate the co-combustion characteristics of peach and apricot stones produced as a waste from the fruit juice industry with coal. A lignite coal was used for co-combustion. on-line concentrations of O-2, CO, CO2, SO2, NOx and total hydrocarbons (CmHn) were measured in the flue gas during combustion experiments. Variations of emissions of various pollutants were studied by chang...
Combustion and co-combustion of olive cake and coal in fluidized bed Varol, Murat; Atımtay, Aysel; Department of Environmental Engineering (2006) In this study, combustion performances and emission characteristics of olive cake and olive cake+coal mixture are investigated in a bubbling fluidized bed of 102 mm inside diameter and 900 mm height. The average particle sizes of coal and olive cake used in the experiments were 1.57 mm and 1.52 mm, respectively. Flue gas concentrations of O2, CO, SO2, NOx, and total hydrocarbons (CmHn) were measured during combustion experiments. Operational parameters (excess air ratio, secondary air injection) were change...

Citation Formats

A. Atımtay, “Combustion of agro-waste with coal in a fluidized bed,” CLEAN TECHNOLOGIES AND ENVIRONMENTAL POLICY, pp. 43–52, 2010, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/30614.