Controversies still exist over the necessity of equipping with an emergency water supply system in the supercritical circulating fluidized bed/CFB unit.To resolve the dispute,research on the safety of the heating surf...Controversies still exist over the necessity of equipping with an emergency water supply system in the supercritical circulating fluidized bed/CFB unit.To resolve the dispute,research on the safety of the heating surfaces in the supercritical CFB boiler during the electricity failure accident under the assumption of not putting the emergency water supply system into use must be conducted.However,due to the low incidence rate of this accident,no relevant data have been reported yet.To provide useful data for the related research,a breakdown accident of the main feed water pump that happened in a 350 MW supercritical CFB boiler was introduced in this work.The analysis of the physical processes in both the furnace and water side of the boiler during this accident was performed.Then the discussion on the similarities and discrepancies between the two accidents was carried out.It was found out that with appropriate handling,the data collected in two periods of the breakdown accident of the main feed water pump can provide a reference for the verification of the prediction model of the electricity failure accident.Finally,a preliminary prediction model was established as the first step of the verification work.展开更多
基金financial supported by the National Key Research Plan(2019YFE0102100)Huaneng Group Science and Technology Research Project(HNKJ20-H50)C9 University Science and Technology Project(201903D421009)。
文摘Controversies still exist over the necessity of equipping with an emergency water supply system in the supercritical circulating fluidized bed/CFB unit.To resolve the dispute,research on the safety of the heating surfaces in the supercritical CFB boiler during the electricity failure accident under the assumption of not putting the emergency water supply system into use must be conducted.However,due to the low incidence rate of this accident,no relevant data have been reported yet.To provide useful data for the related research,a breakdown accident of the main feed water pump that happened in a 350 MW supercritical CFB boiler was introduced in this work.The analysis of the physical processes in both the furnace and water side of the boiler during this accident was performed.Then the discussion on the similarities and discrepancies between the two accidents was carried out.It was found out that with appropriate handling,the data collected in two periods of the breakdown accident of the main feed water pump can provide a reference for the verification of the prediction model of the electricity failure accident.Finally,a preliminary prediction model was established as the first step of the verification work.
