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Subject: Re: Boiler Feed Pump Variable Speed Comparision Fluid Drive Or VFD

Date: 10/27/03 at 2:35 AM
Posted by: Hemant Sawarkar
E-mail: nelcoma_engg@vsnl.net
Message Posted:

In Reply to: Re: Boiler Feed Pump Variable Speed Comparision Fluid Drive Or VFD posted by Prathmesh H Raichura on 11/10/01 at 7:10 AM:

We have worked out the comparison of VFC versus VFD for a 2000kW, 1500rpm boiler feed pump, for a new upcoming project. The VFC, which also contains hydraulic speed enhancer increase speed of motor from 1500rpm to around 4000rpm. The design conditions of VFC are then applied to application of VFD, and the economics are worked out. For the maximum operating conditions (MCR) of the boiler feed pump, the energy saving is quite substantial. Further, looking at the actual operating conditions, there may be more savings possible, from the VFD+BFP system, as the discharge flow requirements shall be lesser. This further adds up to the benefits to achieve lower payback period from the VFD.

The data on the power generatio against possible dischage requirement from the BFP need to be available from the thermal power plant operating engineers.

For a replacement retrofit application, the cost of VFD against removal of VFC would give longer payback periods, depending on the power to be handled, whereas, for a new project, the payback can be in the range of 1.5 years to 2.5years depending on the design aspect.

However, the variable frequency drives pose a good level of reliability concern when used for a Boiler Feed Pump application, because of the criticality of the process.

please contact for more information -
Hemant Sawarkar
High Power AC Drives Group
Nelco Limited
A Tata Enterprise
Tel +91-22-56796969 extension 269
e-mail nelcoma_engg@vsnl.net

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