The temperature of the feed water for an auxiliary boiler is automatically controlled by a pneumatically actuated steam valve at the inlet to the pre-heater. It is noticed that during high demand the temperature falls by an unacceptable amount and takes a long time to return to the set temperature even though the steam supply pressure remains constant. What may be the cause?

asked 29 May, 08:40

May 29, 2019, 8:40 a.m.
KnowledgeBase's gravatar image


81310389577
accept rate: 0%

edited 29 May, 08:42


Answer:

The controller proportional band is set too wide and the reset time is set too long.

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answered 29 May, 08:44

May 29, 2019, 8:44 a.m.
cheng's gravatar image


564812
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