Boiler Feed Water Pump (Hydro Coupling vs vvvF inverter) in Combined Cycle

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phillipwon Associate Join Date: Nov 2011 Posts: 42	Boiler Feed Water Pump (Hydro Coupling vs vvvF inverter) in Combined Cycle 01/11/2013 8:55 AM
	In combined cycle, for part-load operation, I am thinking of using Hydro Coupling or vvvF(Variable Voltage Variable Frequency) Inverter system in Boiler Feedwater Pump. What system would you recommend? And I know some plants which use Hydro coupling, but not vvvF system. Is there any combined cycle plant which, you know, vvvF is applied in Boiler Feedwater Pump or Condensate pump or if any?
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dhayanandhan Guru Join Date: May 2008 Location: CHENNAI, TAMIL NADU, INDIA. Posts: 1851 Good Answers: 65	#1 Re: Boiler Feed Water Pump (Hydro Coupling vs vvvF inverter) in Combined Cycle 01/11/2013 9:21 AM
	Dear Mr. phillipwon, VVVF is preferable. We are are using it for both Feed Pump and Condensate pump. DHAYANANDHAN.S
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Drew K Guru Join Date: Sep 2009 Posts: 1651 Good Answers: 71	#2 Re: Boiler Feed Water Pump (Hydro Coupling vs vvvF inverter) in Combined Cycle 01/11/2013 9:23 AM
	Depends upon your resources. Hydro is an older mechanical means of changing your boiler feed pump rate. It requires regular and consistent upkeep by trained experts. vvvf is newer technology and would require a different support network. My plant is from the '50s and we use fluid drives to couple motors to boiler feed pumps. We perform regular maintenance and have the system monitored for temp and vibration (bearings, motor etc). You have to be forward thinking in this industry, will you have easier (cheaper) access to experts that will be able to come in and perform non-regular maint on your equipment? Do you have experts on hand that can rebuild a hydro or vvvf? Drew K __________________ Question: What is going on with the American's Government? Response: Who is John Galt?
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phillipwon Associate Join Date: Nov 2011 Posts: 42	#3 Re: Boiler Feed Water Pump (Hydro Coupling vs vvvF inverter) in Combined Cycle 01/11/2013 11:07 PM
	What do you think hydro vs vvvf in the aspect of electricity consumption in the part load? And as far as i know, it may be normal to apply hydro or vvvf to boiler feedwater pump, but is it also normal to apply them to condensate pump?
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PWSlack Guru Join Date: Jan 2007 Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on. Posts: 32175 Good Answers: 839	#4 In reply to #3 Re: Boiler Feed Water Pump (Hydro Coupling vs vvvF inverter) in Combined Cycle 01/14/2013 4:01 AM
	Condensate pumps are needed to get condensate back to the boiler hotwell. Over the last 34 years, the number counted here with vvvf on them is exactly zero. __________________ "Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856
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