Narrow Dispersed Fractions of High-Calcium Fly Ash Produced from the Pulverized Combustion of Irsha-Borodinsky Coal

By means of airflow aerodynamic classification, high-calcium fly ash (with a bulk density of 1.14 g/cm 3 and size distribution parameters of d av = 5 µm and d 90 = 14 µm) produced from the combustion of Irsha-Borodinsky coal and sampled from the fourth field of the electrostatic precipitator at the...

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Veröffentlicht in:Thermal engineering 2019-08, Vol.66 (8), p.560-568
Hauptverfasser: Fomenko, E. V., Akimochkina, G. V., Anshits, A. G.
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Anshits, A. G.
description By means of airflow aerodynamic classification, high-calcium fly ash (with a bulk density of 1.14 g/cm 3 and size distribution parameters of d av = 5 µm and d 90 = 14 µm) produced from the combustion of Irsha-Borodinsky coal and sampled from the fourth field of the electrostatic precipitator at the Krasnoyarsk TPP-2 has been separated. The obtained morphologically homogeneous fractions of spherical particles with a narrow distribution are characterized by d av = 1, 2, 3, 4, and 10 μm and d 90 = 3, 4, 5, 9, and 16 μm. It has been established that the main chemical component of the obtained narrow fractions is represented by CaO with a content of 34–43 wt %; the content of the other components is as follows: 15–34 wt % of SiO 2 , 13–16 wt % of Fe 2 O 3 , 9–10 wt % of MgO, 8–10 wt % of Al 2 O 3 , 2–10 wt % of SO 3 . The phase composition has 35–49 wt % of crystalline calcium-containing compounds, including 11–15 wt % of aluminum substituted calcium ferrite and 8–11 wt % of tricalcium aluminate, which are the main phases of Portland cement. The content of crystalline quartz amounts to 2–7 wt %, and that of the amorphous glass phase is 41–51 wt %. It has been established that, as the average fraction size d av obtained after the aerodynamic separation of ash increases from 1 to 10 μm, the bulk ash density exhibits an increase from 0.89 to 1.50 g/cm 3 and the content of the magnetic component also increases, amounting up to 4 wt %. At the same time, the chemical composition of the fractions exhibits an increase in the content of SiO 2 as well as a decrease in the content of Al 2 O 3 and SO 3 . The content of СаО and Fe 2 O 3 in the fractions having d av = 1–3 μm increases, then it exhibits an abrupt decrease with increasing particle size. As far as the phase composition is concerned, an increase in the content of crystalline quartz is observed, and the total fraction of calcium-containing phases gradually decreases. At the same time, the percentage of calcium sulfate decreases and the percentage of free calcium oxide exhibits a considerable increase. The content of calcium hydroxide increases in the fractions having d av  = 1–2 μm and then decreases with increasing particle size.
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The phase composition has 35–49 wt % of crystalline calcium-containing compounds, including 11–15 wt % of aluminum substituted calcium ferrite and 8–11 wt % of tricalcium aluminate, which are the main phases of Portland cement. The content of crystalline quartz amounts to 2–7 wt %, and that of the amorphous glass phase is 41–51 wt %. It has been established that, as the average fraction size d av obtained after the aerodynamic separation of ash increases from 1 to 10 μm, the bulk ash density exhibits an increase from 0.89 to 1.50 g/cm 3 and the content of the magnetic component also increases, amounting up to 4 wt %. At the same time, the chemical composition of the fractions exhibits an increase in the content of SiO 2 as well as a decrease in the content of Al 2 O 3 and SO 3 . The content of СаО and Fe 2 O 3 in the fractions having d av = 1–3 μm increases, then it exhibits an abrupt decrease with increasing particle size. As far as the phase composition is concerned, an increase in the content of crystalline quartz is observed, and the total fraction of calcium-containing phases gradually decreases. At the same time, the percentage of calcium sulfate decreases and the percentage of free calcium oxide exhibits a considerable increase. 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V.</creatorcontrib><creatorcontrib>Akimochkina, G. V.</creatorcontrib><creatorcontrib>Anshits, A. G.</creatorcontrib><title>Narrow Dispersed Fractions of High-Calcium Fly Ash Produced from the Pulverized Combustion of Irsha-Borodinsky Coal</title><title>Thermal engineering</title><addtitle>Therm. Eng</addtitle><description>By means of airflow aerodynamic classification, high-calcium fly ash (with a bulk density of 1.14 g/cm 3 and size distribution parameters of d av = 5 µm and d 90 = 14 µm) produced from the combustion of Irsha-Borodinsky coal and sampled from the fourth field of the electrostatic precipitator at the Krasnoyarsk TPP-2 has been separated. The obtained morphologically homogeneous fractions of spherical particles with a narrow distribution are characterized by d av = 1, 2, 3, 4, and 10 μm and d 90 = 3, 4, 5, 9, and 16 μm. It has been established that the main chemical component of the obtained narrow fractions is represented by CaO with a content of 34–43 wt %; the content of the other components is as follows: 15–34 wt % of SiO 2 , 13–16 wt % of Fe 2 O 3 , 9–10 wt % of MgO, 8–10 wt % of Al 2 O 3 , 2–10 wt % of SO 3 . The phase composition has 35–49 wt % of crystalline calcium-containing compounds, including 11–15 wt % of aluminum substituted calcium ferrite and 8–11 wt % of tricalcium aluminate, which are the main phases of Portland cement. The content of crystalline quartz amounts to 2–7 wt %, and that of the amorphous glass phase is 41–51 wt %. It has been established that, as the average fraction size d av obtained after the aerodynamic separation of ash increases from 1 to 10 μm, the bulk ash density exhibits an increase from 0.89 to 1.50 g/cm 3 and the content of the magnetic component also increases, amounting up to 4 wt %. At the same time, the chemical composition of the fractions exhibits an increase in the content of SiO 2 as well as a decrease in the content of Al 2 O 3 and SO 3 . The content of СаО and Fe 2 O 3 in the fractions having d av = 1–3 μm increases, then it exhibits an abrupt decrease with increasing particle size. As far as the phase composition is concerned, an increase in the content of crystalline quartz is observed, and the total fraction of calcium-containing phases gradually decreases. At the same time, the percentage of calcium sulfate decreases and the percentage of free calcium oxide exhibits a considerable increase. The content of calcium hydroxide increases in the fractions having d av  = 1–2 μm and then decreases with increasing particle size.</description><subject>Air flow</subject><subject>Aluminum oxide</subject><subject>Boiler Auxiliary Equipment</subject><subject>Bulk density</subject><subject>Burner Units</subject><subject>Calcium aluminate</subject><subject>Calcium aluminum ferrite</subject><subject>Calcium compounds</subject><subject>Calcium ferrites</subject><subject>Calcium oxide</subject><subject>Calcium sulfate</subject><subject>Chemical composition</subject><subject>Combustion</subject><subject>Crystal structure</subject><subject>Crystallinity</subject><subject>Electrostatic precipitators</subject><subject>Engineering</subject><subject>Engineering Thermodynamics</subject><subject>Fly ash</subject><subject>Heat and Mass Transfer</subject><subject>Organic chemistry</subject><subject>Particle size</subject><subject>Particle size distribution</subject><subject>Phase composition</subject><subject>Portland cements</subject><subject>Power-Plant Fuels</subject><subject>Precipitators</subject><subject>Quartz</subject><subject>Silicon dioxide</subject><subject>Slaked lime</subject><subject>Steam Boilers</subject><subject>Sulfur trioxide</subject><subject>Tricalcium aluminate</subject><issn>0040-6015</issn><issn>1555-6301</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2019</creationdate><recordtype>article</recordtype><recordid>eNp1kF1LwzAUhoMoOKc_wLuA19Vz8tF1l7M6Nxg6cPclzdK1s21msirz15sywQvx6pDzPs8bOIRcI9wicnH3CiAgBpQ4hgSAwQkZoJQyijngKRn0cdTn5-TC-214CoFyQPyzcs5-0ofK74zzZk2nTul9ZVtPbUFn1aaMUlXrqmvotD7QiS_p0tl1pwNaONvQfWnosqs_jKu-wi61Td75vqD3586XKrq3waha_3YIsaovyVmham-ufuaQrKaPq3QWLV6e5ulkEWku5T7SQozzWGjJkYFJ4hzyhHFhJItxFK8FA-SG8UKhjHWR5BwxYFIJUFBww4fk5li7c_a9M36fbW3n2vBjxpgcC2BsJAKFR0o7670zRbZzVaPcIUPI-tNmf04bHHZ0fGDbjXG_zf9L33z7ebQ</recordid><startdate>20190801</startdate><enddate>20190801</enddate><creator>Fomenko, E. 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G.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c355t-c449b64c53120e86b0b8234e526176d42013e23fa156cf8b3110e85a40a0f3e3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2019</creationdate><topic>Air flow</topic><topic>Aluminum oxide</topic><topic>Boiler Auxiliary Equipment</topic><topic>Bulk density</topic><topic>Burner Units</topic><topic>Calcium aluminate</topic><topic>Calcium aluminum ferrite</topic><topic>Calcium compounds</topic><topic>Calcium ferrites</topic><topic>Calcium oxide</topic><topic>Calcium sulfate</topic><topic>Chemical composition</topic><topic>Combustion</topic><topic>Crystal structure</topic><topic>Crystallinity</topic><topic>Electrostatic precipitators</topic><topic>Engineering</topic><topic>Engineering Thermodynamics</topic><topic>Fly ash</topic><topic>Heat and Mass Transfer</topic><topic>Organic chemistry</topic><topic>Particle size</topic><topic>Particle size distribution</topic><topic>Phase composition</topic><topic>Portland cements</topic><topic>Power-Plant Fuels</topic><topic>Precipitators</topic><topic>Quartz</topic><topic>Silicon dioxide</topic><topic>Slaked lime</topic><topic>Steam Boilers</topic><topic>Sulfur trioxide</topic><topic>Tricalcium aluminate</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Fomenko, E. V.</creatorcontrib><creatorcontrib>Akimochkina, G. V.</creatorcontrib><creatorcontrib>Anshits, A. G.</creatorcontrib><collection>CrossRef</collection><jtitle>Thermal engineering</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Fomenko, E. V.</au><au>Akimochkina, G. V.</au><au>Anshits, A. G.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Narrow Dispersed Fractions of High-Calcium Fly Ash Produced from the Pulverized Combustion of Irsha-Borodinsky Coal</atitle><jtitle>Thermal engineering</jtitle><stitle>Therm. Eng</stitle><date>2019-08-01</date><risdate>2019</risdate><volume>66</volume><issue>8</issue><spage>560</spage><epage>568</epage><pages>560-568</pages><issn>0040-6015</issn><eissn>1555-6301</eissn><abstract>By means of airflow aerodynamic classification, high-calcium fly ash (with a bulk density of 1.14 g/cm 3 and size distribution parameters of d av = 5 µm and d 90 = 14 µm) produced from the combustion of Irsha-Borodinsky coal and sampled from the fourth field of the electrostatic precipitator at the Krasnoyarsk TPP-2 has been separated. The obtained morphologically homogeneous fractions of spherical particles with a narrow distribution are characterized by d av = 1, 2, 3, 4, and 10 μm and d 90 = 3, 4, 5, 9, and 16 μm. It has been established that the main chemical component of the obtained narrow fractions is represented by CaO with a content of 34–43 wt %; the content of the other components is as follows: 15–34 wt % of SiO 2 , 13–16 wt % of Fe 2 O 3 , 9–10 wt % of MgO, 8–10 wt % of Al 2 O 3 , 2–10 wt % of SO 3 . The phase composition has 35–49 wt % of crystalline calcium-containing compounds, including 11–15 wt % of aluminum substituted calcium ferrite and 8–11 wt % of tricalcium aluminate, which are the main phases of Portland cement. The content of crystalline quartz amounts to 2–7 wt %, and that of the amorphous glass phase is 41–51 wt %. It has been established that, as the average fraction size d av obtained after the aerodynamic separation of ash increases from 1 to 10 μm, the bulk ash density exhibits an increase from 0.89 to 1.50 g/cm 3 and the content of the magnetic component also increases, amounting up to 4 wt %. At the same time, the chemical composition of the fractions exhibits an increase in the content of SiO 2 as well as a decrease in the content of Al 2 O 3 and SO 3 . The content of СаО and Fe 2 O 3 in the fractions having d av = 1–3 μm increases, then it exhibits an abrupt decrease with increasing particle size. As far as the phase composition is concerned, an increase in the content of crystalline quartz is observed, and the total fraction of calcium-containing phases gradually decreases. At the same time, the percentage of calcium sulfate decreases and the percentage of free calcium oxide exhibits a considerable increase. The content of calcium hydroxide increases in the fractions having d av  = 1–2 μm and then decreases with increasing particle size.</abstract><cop>Moscow</cop><pub>Pleiades Publishing</pub><doi>10.1134/S0040601519080020</doi><tpages>9</tpages></addata></record>
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ispartof Thermal engineering, 2019-08, Vol.66 (8), p.560-568
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subjects Air flow
Aluminum oxide
Boiler Auxiliary Equipment
Bulk density
Burner Units
Calcium aluminate
Calcium aluminum ferrite
Calcium compounds
Calcium ferrites
Calcium oxide
Calcium sulfate
Chemical composition
Combustion
Crystal structure
Crystallinity
Electrostatic precipitators
Engineering
Engineering Thermodynamics
Fly ash
Heat and Mass Transfer
Organic chemistry
Particle size
Particle size distribution
Phase composition
Portland cements
Power-Plant Fuels
Precipitators
Quartz
Silicon dioxide
Slaked lime
Steam Boilers
Sulfur trioxide
Tricalcium aluminate
title Narrow Dispersed Fractions of High-Calcium Fly Ash Produced from the Pulverized Combustion of Irsha-Borodinsky Coal
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