Co-combustion of biocoal and lignite in a circulating fluidised bed combustor to decrease the impact on global warming

Date

2019-01-01

Author

Keivani, Babak
OLGUN, HAYATİ
Atımtay, Aysel

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

178
views

0
downloads

This work covers co-combustion of biocoal obtained from red pine wood chips with Orhaneli lignite in a 30 kW-thermal capacity circulating fluidised bed combustor (CFBC) system in air and oxygen-enriched atmosphere. The combustor was of 108 mm inside diameter and 6 m height. The combustion temperature was held at 850+50 degrees C. Oxygen enriched combustion tests were carried out at different ratios of lignite and biocoal mixtures. Biocoal share in the fuel mixture was increased up to 50% by wt. It was found that the fuel mixtures up to 50% by wt. of biocoal were combusted effectively in the system. The oxygen concentration in the oxidant was varied between 21 and 27% by vol. for the oxygen-enriched combustion experiments. The results showed that biocoal can be a good additive fuel to lignite coal and oxygen-enriched co-combustion is an option for reducing flue gas emissions of SO2, CO and N2O.

Subject Keywords

Biomass, Torrefaction, Biocoal, Oxygen Enriched Combustion, Circulating Fluidised Bed Combustion

URI

https://hdl.handle.net/11511/31483

Journal

INTERNATIONAL JOURNAL OF GLOBAL WARMING

DOI

https://doi.org/10.1504/ijgw.2019.100313

Collections

Graduate School of Natural and Applied Sciences, Article

Suggestions

OpenMETU
Core

Co-combustion of high and low ash lignites with raw and torrefied biomass under air and oxy-fuel combustion atmospheres Barzegar, Ramin; Yozgatlıgil, Ahmet; Atımtay, Aysel (2022-02-01) Co-combustion characteristics of high and low ash lignites blended with raw and torrefied pine woodchips were studied by Thermogravimetric Analyzer (TGA) under air and oxy-fuel conditions. The lignites were blended with biomass samples at the mass fraction of 50/50 wt.%. Three heating rates of 10, 20, and 40 degrees C/min were chosen, and the characteristic temperatures, including initial, ignition, and burnout temperatures, were obtained. In order to estimate the activation energies of the co-combustion of...
Co-firing of steam coal with high sulfur content lignite in a bubbling fluidized bed combustor Selçuk, Nevin; Altindag, Hakan (2005-05-25) Combustion and emission behavior of 100 % steam coal (SET 1) and a mixture of 80 % by weight steam coal and 20 % by weight local lignite, characterized by high sulfur and ash contents, (SET 2) were investigated in the 0.3 MW, Middle East Technical University (METU) Atmospheric Bubbling Fluidized Bed Combustor (ABFBC) Test Rig. Experiments were performed with limestone addition at various Ca/S molar ratios with fines recycle. In both sets of experiments, parameters other than Ca/S molar ratio were held as ne...
Co-firing of pine chips with Turkish lignites in 750 kWth circulating fluidized bed combustion system Atımtay, Aysel; Unlu, Alper; Engin, Berrin; Varol, Murat; OLGUN, HAYATİ; Atakül, Hüsnü (2017-01-01) Two Turkish lignites which have different sulfur levels (2-2.9% dry) and ash levels (17-25% dry) were combusted with a Turkish forest red pine chips in a 750 kW-thermal capacity circulating fluidized bed combustor (CFBC) system. The combustion temperature was held at 850 +/- 50 degrees C. Flue gas emissions were measured by Gasmet DX-4000 flue gas analyzer. Two lignites were combusted alone, and then limestone was added to lignites to reduce SO2 emissions. Ca/S = 3 was used. 30% percent of red pine chips we...
Influence of bag filter ash to spectral thermal radiation in fluidized bed combustors Co-Fired with biomass Yaşar, Mehmet Soner; Selçuk, Nevin; Külah, Görkem (2021-09-01) Influence of fine particles collected in bag filter on spectral thermal radiation is investigated in the freeboard of a 0.3 MWt atmospheric bubbling fluidized bed combustion test rig where lignite, lignite/olive residue, and lignite/hazelnut shell blends are fired with limestone addition. For this purpose, a 3-D radiation code based on method of lines solution of discrete ordinates method coupled with banded one gas spectral line-based weighted sum of gray gases for spectral gas properties, Mie theory for s...
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...

Citation Formats

B. Keivani, H. OLGUN, and A. Atımtay, “Co-combustion of biocoal and lignite in a circulating fluidised bed combustor to decrease the impact on global warming,” INTERNATIONAL JOURNAL OF GLOBAL WARMING, pp. 120–137, 2019, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/31483.