Why are no control valves installed at the outlets of the forced circulation water pumps in boilers?
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Why are no control valves installed at the outlets of the forced circulation water pumps in boilers?
It’s just a circulating flow control or pump outlet pressure, right? A manual valve will do. No action is needed in case of power outages or loss of wind.
Yes, control the traffic. But if there is voltage fluctuation, then it is necessary to control the flow rate. In an instant, the dual pumps started automatically due to the power surge, causing the flow rate to increase sharply; as a result, it became difficult to control the liquid level in the steam drum. This point often becomes a focus in our handling of voltage fluctuations. If there is a control valve, the operator can control it directly, which frees up some manpower during power fluctuations.
Forced reflux: What impact would a short-term interruption of forced reflux due to a power outage have?
There are two reasons for self-starting: 1. Self-starting caused by brief power fluctuations is due to electrical issues; that is, after a temporary loss of power supply, the power is restored and the pump that was running continues to operate, with an interval of no more than 2 seconds. 2. Self-starting caused by process or equipment conditions, that is, the standby pump starts automatically when the flow rate falls below a critical value. Therefore, I think perhaps your second self-start condition isn’t very reasonable – or rather, a delay should be applied once the value drops below a certain level; the system should then initiate automatically after 5 seconds if the value remains below that threshold!
I’m not talking about the effects when it stops; I’m referring to the effects after both pumps start operating. The flow rate increases suddenly, and the liquid level in the drum drops instantly. If it isn’t adjusted in time, it will be emptied.
Don’t you have a button to remotely start and stop the circulation water pump?