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1.发明公开公开(公告)号：US20230220989A1
公开(公告)日：2023-07-13
申请号：US18004525
申请日：2020-07-14
发明人： Ari KETTUNEN , Teri HILTUNEN
CPC分类号： F23C10/32 , F23N5/242 , F23C10/24 , F23N1/002 , F23N2225/06 , F23C2206/102 , F23C2900/10008
摘要： A method of preventing blockage of circulating bed material in a circulating fluidized bed reactor includes collecting a continuously flowing bed of solid particles in a gas lock in a return leg of a reactor, measuring gas lock bed pressure values within the bed of the particles, generating a gas lock bed height indication signal on the basis of measured gas lock bed pressure values. A definition stage includes defining and storing to a control system a range of normal gas lock bed height indication signals, formed in normal circulation flow conditions, as a function of the reactor load, and defining and storing to the digital control system a reactor load dependent alarm criterion. The method includes comparing a current gas lock bed height indication signal with the reactor load dependent alarm criterion, and decreasing the reactor load if the current indication signal fulfils the reactor load dependent alarm criterion.
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2.发明公开公开(公告)号：US20240318815A1
公开(公告)日：2024-09-26
申请号：US18576482
申请日：2021-09-09
发明人： Teri HILTUNEN
IPC分类号： F22B37/42
CPC分类号： F22B37/421
摘要： A method of determining a tube leakage in a water-steam circuit of a combustion boiler system. The method includes measuring a main steam flow (QMS,M) prevailing in the water-steam circuit of the system during operation, modelling the main steam flow (QMS,C) in the water-steam circuit during operation by utilizing process data in a numerical model of the system giving the main steam (QMS,C) flow of the system under substantially tube-leak-free conditions, comparing the measured water-steam flow with the modelled water-steam flow to obtain an error measure (DMS) for main steam flow included in an error measure set, monitoring the error measure set and number of occurrences in the error measure set during operation, and determining the presence of a water-steam circuit tube leakage when error measures (ΔMS) exceed a pre-defined threshold, or a number of occurrences in the error measure set exceed a predetermined threshold during a predetermined time period.
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