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Title: Physicochemical characterizations and desulfurization properties in coal combustion of three calcium and sodium industrial wastes

Abstract

To recycle industrial wastes and reduce SO{sub 2} pollutant emission in coal combustion, the mineralogical compositions, porosity structures, surface morphologies, and desulfurization properties of three calcium and sodium industrial wastes were investigated via X-ray diffraction (XRD), porosimeter, scanning electron microscopy (SEM), and a fixed-bed reactor. (1) White lime mud (WLM) mainly composed of CaCO{sub 3} with Na{sub 2}O and K{sub 2}O impurities has smaller CaCO{sub 3} particles and a higher surface area than limestone. But calcined WLM has larger CaO particles and a lower surface area than limestone calcined at 1200{sup o}C for 300 s. (2) Calcium carbide residue (CCR) mainly composed of Ca(OH)2, has the highest surface area and smaller Ca(OH){sub 2} particles than the CaCO{sub 3} particles in WLM. Its surface area monotonously and dramatically decreases at 1200{sup o}C for 300 s, but the sintered CaO particles are still smaller than those in the limestone. (3) When brine sludge (BS), mainly composed of NaCl and CaCO{sub 3}, is heated at 1200{sup o}C for 300 s, the NaCl/CaO eutectic solvent facilitates the aggregation of some complex composites to form many larger particles. (4) WLM gives the highest desulfurization efficiency of 80.4% at 1000{sup o}C and 65.0% at 1100{sup o}Cmore » in coal combustion. Combined CCR and limestone give a synergistic desulfurization efficiency of 45.8% at 1200{sup o}C. BS with a molar ratio of Na/Ca at 1:15 effectively promotes the synergistic desulfurization efficiency of combined CCR and limestone to a peak of 54.9% at 1200{sup o}C. 23 refs., 10 figs., 3 tabs.« less

Authors:
; ; ; ;  [1]
  1. Zhejiang University, Hangzhou (China). State Key Laboratory of Clean Energy Utilization
Publication Date:
OSTI Identifier:
21261537
Resource Type:
Journal Article
Journal Name:
Energy and Fuels
Additional Journal Information:
Journal Volume: 23; Journal Issue: 5; Journal ID: ISSN 0887-0624
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; INDUSTRIAL WASTES; SULFUR DIOXIDE; EMISSION; COAL; COCOMBUSTION; MINERALOGY; POROSITY; MORPHOLOGY; CALCIUM CARBONATES; SODIUM OXIDES; POTASSIUM OXIDES; CALCIUM CARBIDES; CALCIUM HYDROXIDES; SURFACE AREA; PARTICLE SIZE; DESULFURIZATION; LIMESTONE; WASTE PRODUCT UTILIZATION

Citation Formats

Cheng, Jun, Zhou, Junhu, Liu, Jianzhong, Cao, Xinyu, and Cen, Kefa. Physicochemical characterizations and desulfurization properties in coal combustion of three calcium and sodium industrial wastes. United States: N. p., 2009. Web. doi:10.1021/ef8007568.
Cheng, Jun, Zhou, Junhu, Liu, Jianzhong, Cao, Xinyu, & Cen, Kefa. Physicochemical characterizations and desulfurization properties in coal combustion of three calcium and sodium industrial wastes. United States. https://doi.org/10.1021/ef8007568
Cheng, Jun, Zhou, Junhu, Liu, Jianzhong, Cao, Xinyu, and Cen, Kefa. 2009. "Physicochemical characterizations and desulfurization properties in coal combustion of three calcium and sodium industrial wastes". United States. https://doi.org/10.1021/ef8007568.
@article{osti_21261537,
title = {Physicochemical characterizations and desulfurization properties in coal combustion of three calcium and sodium industrial wastes},
author = {Cheng, Jun and Zhou, Junhu and Liu, Jianzhong and Cao, Xinyu and Cen, Kefa},
abstractNote = {To recycle industrial wastes and reduce SO{sub 2} pollutant emission in coal combustion, the mineralogical compositions, porosity structures, surface morphologies, and desulfurization properties of three calcium and sodium industrial wastes were investigated via X-ray diffraction (XRD), porosimeter, scanning electron microscopy (SEM), and a fixed-bed reactor. (1) White lime mud (WLM) mainly composed of CaCO{sub 3} with Na{sub 2}O and K{sub 2}O impurities has smaller CaCO{sub 3} particles and a higher surface area than limestone. But calcined WLM has larger CaO particles and a lower surface area than limestone calcined at 1200{sup o}C for 300 s. (2) Calcium carbide residue (CCR) mainly composed of Ca(OH)2, has the highest surface area and smaller Ca(OH){sub 2} particles than the CaCO{sub 3} particles in WLM. Its surface area monotonously and dramatically decreases at 1200{sup o}C for 300 s, but the sintered CaO particles are still smaller than those in the limestone. (3) When brine sludge (BS), mainly composed of NaCl and CaCO{sub 3}, is heated at 1200{sup o}C for 300 s, the NaCl/CaO eutectic solvent facilitates the aggregation of some complex composites to form many larger particles. (4) WLM gives the highest desulfurization efficiency of 80.4% at 1000{sup o}C and 65.0% at 1100{sup o}C in coal combustion. Combined CCR and limestone give a synergistic desulfurization efficiency of 45.8% at 1200{sup o}C. BS with a molar ratio of Na/Ca at 1:15 effectively promotes the synergistic desulfurization efficiency of combined CCR and limestone to a peak of 54.9% at 1200{sup o}C. 23 refs., 10 figs., 3 tabs.},
doi = {10.1021/ef8007568},
url = {https://www.osti.gov/biblio/21261537}, journal = {Energy and Fuels},
issn = {0887-0624},
number = 5,
volume = 23,
place = {United States},
year = {Fri May 15 00:00:00 EDT 2009},
month = {Fri May 15 00:00:00 EDT 2009}
}