The flexible boiler operation in a wide range of load changes with considering the strength and environmental restrictions / Jan Taler, Marcin Trojan, Piotr Dzierwa, Karol Kaczmarski, Bohdan Węglowski, ... więcej

The flexible boiler operation in a wide range of load changes with considering the strength and environmental restrictions / Jan Taler, Marcin Trojan, Piotr Dzierwa, Karol Kaczmarski, Bohdan Węglowski, Dawid Taler, Wiesław Zima, Sławomir Grądziel, Paweł Ocłoń, Tomasz Sobota, Monika Rerak, Magdalena Jaremkiewicz // Energy [Dokument elektroniczny]. – 2023, Vol. 263, Pt. B, 14 s. : rys., tab., wykr. – Tryb dostępu: https://www.sciencedirect.com/science/article/abs/pii/S0360544222026317. – Oznaczenie ref./art.: 125745. – Bibliogr. 35 poz., Abstr. – doi: 10.1016/j.energy.2022.125745. – ISSN 0360-5442

Thermal steam units cooperating in one power system with wind and photovoltaic farms must have high flexibility, i.e., operate over a wide range of load variations, typically between 40 and 100%. In addition, ... więcej

Thermal steam units cooperating in one power system with wind and photovoltaic farms must have high flexibility, i.e., operate over a wide range of load variations, typically between 40 and 100%. In addition, the start-up and shutdown time of the unit should be short. Thick-walled pressure components that limit the fast start-up of the units are turbines, steam boilers, and pipeline branches due to the occurrence of high thermal stresses in them. This paper determines the allowable heating rates of thick-walled components of a 97.22 kg/s natural circulation steam boiler. The boiler drum is the critical element, with a heating time of about 6000 s from the cold state. Computer simulations of the boiler combustion chamber were also performed at three different loads, i.e., 100, 60 and 40%. The calculations show that the maximum emissions of harmful substances do not exceed the permissible values given in European regulations: CO ≤ 140 mg/m3 n and NOx ≤ 100 mg/m3 n . The maximum content of CO = 136.8 mg/m3 n occurs at 60% boiler load. The maximum content of NOx = 217.3 mg/m3 n in the exhaust gas upstream of the SCR (Selective Catalytic Reduction) system occurs at 40% load, but downstream of the SCR system is reduced below the limit value 100 mg/m3 n.