Co-firing of pine chips with Turkish lignites in 750 kWth circulating fluidized bed combustion system

Atımtay, Aysel
Unlu, Alper
Engin, Berrin
Varol, Murat
Atakül, Hüsnü
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 were added to the lignites for co-firing experiments without limestone in order to see the biomass effects. The results showed that with limestone addition SO2 concentration was reduced below the limit values for all lignites. CO emissions are high at low excess air ratios, gets lower as the excess air ratio increases. During co-firing experiments the temperature in the freeboard was 100-150 degrees C higher as compared to coal combustion experiments.


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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...
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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
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Production of Cellulase and Xylanase Enzymes Using Distillers Dried Grains with Solubles (DDGS) by Trichoderma reeseiat Shake-Flask Scale and the Validation in the Benchtop Scale Bioreactor
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Most of the corn-ethanol plants use dry-mill process and generate large volume of distillers dried grains with solubles (DDGS) as the co-product. The DDGS is a promising feedstock with rich content of cellulose and xylan. The goal of this study was to optimize cellulase and xylanase production byTrichoderma reesei(NRRL 6156) using DDGS as the carbon source at shake-flask and validate the results at benchtop bioreactors. The fermentation medium containing varied amounts of dilute-acid pretreated DDGS, yeast ...
Citation Formats
A. Atımtay, A. Unlu, B. Engin, M. Varol, H. OLGUN, and H. Atakül, “Co-firing of pine chips with Turkish lignites in 750 kWth circulating fluidized bed combustion system,” BIORESOURCE TECHNOLOGY, pp. 601–610, 2017, Accessed: 00, 2020. [Online]. Available: