Numerical Study of Furnace Processes during Combustion of Off-Design Coals in a 220 t/h Boiler
| Parent link: | Thermal Engineering Vol. 69, iss. 12.— 2022.— [P. 971-980] |
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| Other Authors: | , , , |
| Summary: | Title screen In Russia, boiler units at many coal-fired thermal power plants (TPPs) are being converted to operation on off-design fuel due to the introduction of more and more strict environmental regulations, changes in the economic situation, and also due to a decrease in design coal reserves. During the service life of the Artemovsk combined heat and power plant (TETs), the design coal deposit was exhausted. Therefore, a replacement solid fuel for BKZ-220-100F boiler units had to be found. Since conversion to off-design coals may induce negative factors, such as a decrease in the reliability of the heating surfaces and maintenance of the required superheated steam conditions, a variant analysis, including that on the basis of numerical simulation, of the processes occurring during coal burning in a combustion chamber (furnace) enjoys current interests. The objective of this study is to analyze the effect of furnace processes on operating reliability, efficiency, and environmental safety of a boiler unit when burning off-design coals. Numerical analysis was carried out using the ANSYS Fluent software package, and mathematical modeling of furnace processes was based on the Euler-Lagrange approach. The results of simulation are compared with check and zone-by-zone calculations of the furnace chamber. In the horizontal section, at the level of the burners, high-temperature zones are singled out in the near-wall region at the corners of the furnace chamber, which are formed by the waterwalls on the left side and front walls as well as the waterwalls on the right side and rear walls.1 The numerical simulation has revealed that the tangential arrangement of the burners induces a vertical vortex in the furnace chamber; however, the direction angles of the burner jets should be corrected. Combustion of El’ginsk coal considerably changes the furnace temperature conditions, thereby increasing the risk of heating surfaces slagging. Режим доступа: по договору с организацией-держателем ресурса |
| Language: | English |
| Published: |
2022
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| Subjects: | |
| Online Access: | https://doi.org/10.1134/S0040601522110040 |
| Format: | Electronic Book Chapter |
| KOHA link: | https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=668839 |