Influence of Sorbent Characteristics on Fouling and Deposition in Circulating Fluid Bed Boilers Firing High Sulfur Indian Lignite
125 MWe circulating fluidized bed combustion (CFBC) boiler experienced severe fouling in backpass of the boiler leading to obstruction of gas flow passage, while using high sulfur lignite with sorbent, calcium carbonate, to capture sulfur dioxide. Optical microscopy of the hard deposits showed m...
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| Format: | Article |
| Language: | English |
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Wiley
2013-01-01
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| Series: | Journal of Combustion |
| Online Access: | http://dx.doi.org/10.1155/2013/438384 |
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| author | Selvakumaran Palaniswamy M. Rajavel A. Leela Vinodhan B. Ravi Kumar A. Lawrence A. K. Bakthavatsalam |
| author_facet | Selvakumaran Palaniswamy M. Rajavel A. Leela Vinodhan B. Ravi Kumar A. Lawrence A. K. Bakthavatsalam |
| author_sort | Selvakumaran Palaniswamy |
| collection | DOAJ |
| description | 125 MWe circulating fluidized bed combustion (CFBC) boiler experienced severe fouling in backpass of the boiler leading to obstruction of gas flow passage, while using high sulfur lignite with sorbent, calcium carbonate, to capture sulfur dioxide. Optical microscopy of the hard deposits showed mainly anhydrite (CaSO4) and absence of intermediate phases such as calcium oxide or presence of sulfate rims on decarbonated limestone. It is hypothesized that loose unreacted calcium oxides that settle on tubes are subjected to recarbonation and further extended sulfation resulting in hard deposits. Foul probe tests were conducted in selected locations of backpass for five different compositions of lignite, with varied high sulfur and ash contents supplied from the mines along with necessary rates of sorbent limestone to control SO2, and the deposits build-up rate was determined. The deposit build-up was found increasing, with increase in ash content of lignite, sorbent addition, and percentage of fines in limestone. Remedial measures and field modifications to dislodge deposits on heat transfer surfaces, to handle the deposits in ash conveying system, and to control sorbent fines from the milling circuit are explained. |
| format | Article |
| id | doaj-art-a4e4c9b86165428e989b5ac82d0d10c4 |
| institution | OA Journals |
| issn | 2090-1968 2090-1976 |
| language | English |
| publishDate | 2013-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Journal of Combustion |
| spelling | doaj-art-a4e4c9b86165428e989b5ac82d0d10c42025-08-20T02:23:05ZengWileyJournal of Combustion2090-19682090-19762013-01-01201310.1155/2013/438384438384Influence of Sorbent Characteristics on Fouling and Deposition in Circulating Fluid Bed Boilers Firing High Sulfur Indian LigniteSelvakumaran Palaniswamy0M. Rajavel1A. Leela Vinodhan2B. Ravi Kumar3A. Lawrence4A. K. Bakthavatsalam5Bharat Heavy Electricals Limited, Tiruchirappalli, Tamil Nadu 620 014, IndiaBharat Heavy Electricals Limited, Tiruchirappalli, Tamil Nadu 620 014, IndiaBharat Heavy Electricals Limited, Tiruchirappalli, Tamil Nadu 620 014, IndiaBharat Heavy Electricals Limited, Tiruchirappalli, Tamil Nadu 620 014, IndiaBharat Heavy Electricals Limited, Tiruchirappalli, Tamil Nadu 620 014, IndiaNational Institute of Technology, Tiruchirappalli, Tamil Nadu 620015, India125 MWe circulating fluidized bed combustion (CFBC) boiler experienced severe fouling in backpass of the boiler leading to obstruction of gas flow passage, while using high sulfur lignite with sorbent, calcium carbonate, to capture sulfur dioxide. Optical microscopy of the hard deposits showed mainly anhydrite (CaSO4) and absence of intermediate phases such as calcium oxide or presence of sulfate rims on decarbonated limestone. It is hypothesized that loose unreacted calcium oxides that settle on tubes are subjected to recarbonation and further extended sulfation resulting in hard deposits. Foul probe tests were conducted in selected locations of backpass for five different compositions of lignite, with varied high sulfur and ash contents supplied from the mines along with necessary rates of sorbent limestone to control SO2, and the deposits build-up rate was determined. The deposit build-up was found increasing, with increase in ash content of lignite, sorbent addition, and percentage of fines in limestone. Remedial measures and field modifications to dislodge deposits on heat transfer surfaces, to handle the deposits in ash conveying system, and to control sorbent fines from the milling circuit are explained.http://dx.doi.org/10.1155/2013/438384 |
| spellingShingle | Selvakumaran Palaniswamy M. Rajavel A. Leela Vinodhan B. Ravi Kumar A. Lawrence A. K. Bakthavatsalam Influence of Sorbent Characteristics on Fouling and Deposition in Circulating Fluid Bed Boilers Firing High Sulfur Indian Lignite Journal of Combustion |
| title | Influence of Sorbent Characteristics on Fouling and Deposition in Circulating Fluid Bed Boilers Firing High Sulfur Indian Lignite |
| title_full | Influence of Sorbent Characteristics on Fouling and Deposition in Circulating Fluid Bed Boilers Firing High Sulfur Indian Lignite |
| title_fullStr | Influence of Sorbent Characteristics on Fouling and Deposition in Circulating Fluid Bed Boilers Firing High Sulfur Indian Lignite |
| title_full_unstemmed | Influence of Sorbent Characteristics on Fouling and Deposition in Circulating Fluid Bed Boilers Firing High Sulfur Indian Lignite |
| title_short | Influence of Sorbent Characteristics on Fouling and Deposition in Circulating Fluid Bed Boilers Firing High Sulfur Indian Lignite |
| title_sort | influence of sorbent characteristics on fouling and deposition in circulating fluid bed boilers firing high sulfur indian lignite |
| url | http://dx.doi.org/10.1155/2013/438384 |
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