Design of quench water pumps

It’s not necessary. Variable frequency drives are mainly used for precise and frequent adjustment of the controlled quantity. For example, the adjustment of the coal slurry flow rate. As the quench water flow rate, it neither needs to be very precise nor very frequent. So there’s no need at all.

It can be said that there is absolutely no need for it. 1. From a process perspective, the amount of water entering the quench chamber is controlled directly by a flow control valve, which is very convenient and fast, and the operation is simple as well ； Although the requirements for this valve are somewhat high, it is necessary to have it installed; why not go with it then? ； 2. In terms of the equipment, this pump has high head, flow rate, and load requirements; as a result, the motor used must also meet high standards. Additionally, the rotational speed of the pump itself is carefully specified, and it should not be changed arbitrarily, otherwise it will operate under suboptimal conditions ； 3. From an investment perspective, for the reasons mentioned above, the requirements for motors have become very high; if variable frequency drive technology is to be used, the demands on motors increase even further, resulting in higher equipment investment compared to the original scenario ； 4. Considering the characteristics of centrifugal pumps, due to the high water temperature in the scrubber tower, if the outlet flow rate of such a pump is too low (for example, when the gasifier is operating at its minimum load), cavitation can easily occur within the pump. To address this issue, it is not necessary to change the pump’s speed; instead, it is sufficient to maintain a minimum allowable flow rate and direct any excess flow back. This approach not only meets the process requirements but also prevents the occurrence of cavitation ； As for the return pipeline, it can be accomplished using a Venturi scrubber, or a separate return pipeline can be installed – it’s not at all troublesome. This post was last edited by 419423903 on 2009-4-4 03:12]