发明名称 |
Apparatus for controlling drum water level of drum type boiler |
摘要 |
An apparatus for controlling the drum water level of a drum boiler prevents the boiler system from being tripped off which would otherwise be caused by an excessive fall in the drum water level immediately after the start of load runback, by increasing the real feed water flow rate in such a manner that a feed water flow rate demand signal obtained from the drum water level deviation is corrected by a feed water flow rate increment signal obtained from the amount of load reduction (load demand-load reference after load runback) at the time of load runback. In addition, the fact that the drum water level stops falling and starts to rise is detected, and the feed water flow rate demand signal is adjusted so as to take a medium value between the real feed water flow rate and the real main steam flow rate, thereby preventing the boiler system from being tripped off which would otherwise be caused by an excessive rise in the drum water level.
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申请公布号 |
US4619224(A) |
申请公布日期 |
1986.10.28 |
申请号 |
US19850765437 |
申请日期 |
1985.08.14 |
申请人 |
HITACHI, LTD. |
发明人 |
TAKITA, ATSUSHI;SUGANO, AKIRA;HONDA, NAGANOBU |
分类号 |
F22B35/02;F22D5/30;(IPC1-7):F22D5/26 |
主分类号 |
F22B35/02 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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