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Anonymous Poster #1

Power Plant Question

11/20/2014 7:49 AM

WHAT IS THE FUNCTION OF RE - CIRCULATION VALVE OF BOILER FEED PUMP
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Anonymous Poster #2
#1

Re: POWER PLANT

11/20/2014 8:04 AM

CHECK THESE LINKS FOR THE REQUIRED INFO.

http://www.documentation.emersonprocess.com/groups/publicreadonly/documents/webpage/ad104_cc.hcsp

http://www.ccivalve.com/~/media/Files/C/CCI/pdf/205-drag-valves-for-boiler-feedpump-recirculation.pdf

http://www.schuf-india.com/pdf/automatic-recirculation-valve-brochure
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lyn
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#2

Re: POWER PLANT

11/20/2014 8:10 AM

RE - CIRCULATION
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SHOCKHISCAN
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#3

Re: POWER PLANT

11/20/2014 9:38 AM

To maintain a minimum flow in the boiler feedwater circuit and avoid damage to the pump should a restriction develop in the piping downstream of the pump discharge.

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#4

Re: Power Plant Question

11/20/2014 12:07 PM

IT DOES EXACTLY WHAT IT SAYS ON THE TIN.

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koper
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#5

Re: Power Plant Question

11/21/2014 7:36 AM

Boiler feed pumping in power plant operation is accomplished under varying flow conditions. When pumping a fluid at or near its vapor pressure ( boiling ) there is a strong possibility of flow disturbance at low flow conditions. Utilizing a recirculation circuit to achieve a positive flow rate in a pumping arrangement is often found helpful at reducing cavitations. Check the link below for general knowledge on fluid cavitations.

www.pdhcenter.com/courses/m225/m225content.pdf

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James Stewart
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#6
In reply to #5

Re: Power Plant Question

11/21/2014 12:42 PM

The only thing I would add to that is that it also helps with preventing the pump from over-heating, and depending on the feed-water heater circuit layout, may help prevent lifting safety valves on heaters when shifting to minimal load on boiler. Usually when boiler has been operating near maximum production rate, there is some heat storage in the furnace, etc., such that with a large reduction in steam rate, steam may be excessive for a short time to the feed-water heaters (as a ratio of extracted steam to feed-water flow rate), resulting in excessive pressure on shell side.

It also helps during hydro-static testing of boilers to have a re-circulation flow for when the system finally vents away the last bit of air, and pressure ramp takes place.

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