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Centrifugal Pump on Subcritical Boiler forced circ

Saturday, May 05, 2018   By: Power engineering [2258] 0 Stars
Good day, I was hoping if you guys can help me better understand the follow paragraph about controlled circulation boiler. Its for my studies.

A large controlled circulation boiler employs several circulating pumps tied into a common suction manifold and a common discharge header. Usually, vertical centrifugal pumps driven by constant speed motors are used. Single stage pumps are adequate as the required head is about 275 kPa -40 psi-. Although the pump may only be required to develop a head of about 275 kPa -40 psi-, this head is over and above the boiler pressure existing at the pump suction which may be 14 000 kPa -2030psi- or over.

I dont quite understand what they mean by 275KPA -40psi- can be over and above 14000 KPA -2030psi-? Please help me understand.

Thank you very much.

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Sunday, May 06, 2018   By: Basem Belal [2194] 2 Stars
Circulation pump will take the pressurized water from boilers down-comer at 14000 Kpa and push it again through bottom header at 14275 Kpa to made forced flow in boiler tubes.
circulation pump will get 14000 Kpa at its suction and 14275 Kpa at its discharge.

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Monday, May 07, 2018   By: Ross Burns [390] 5 Stars
The impeller on a centrifugal pump that you describe can produce a pressure head of 275kpa or 40-psi above the inlet pressure of the pump. So, if you have two-impellers in your centrifugal pump then 40-psi + 40-psi is 80-psi, so the centrifugal pump would pump out 2030-psi + 80-psi to equal 2110-psi. Likewise, if you had a inlet pressure of 1000-psi and the centrifugal pump produces a head of 40-psi then the output or discharge pressure will be 1040-psi. As Basem Belal explained well enough, the pump is to circulate and the 40-psi is to overcome the boilers circuit friction and a little more to move the water to ensure adequate boiler water convection flows for the heat absorbing surfaces. Unlike a Boiler Feedwater Pump a primary obstacle is to overcome the steam drum press.

Ross

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High Sulfite Residual
By: Ross. [390]

First, I want to say that large amounts of Sodium Sulfite NaSO3 becomes a contaminate because it will produce foaming and other problems, but foaming is the primary problem.

Your 500-psi Water Tube Boiler is seems to have reasonable level of residual Sodium Sulfite NaSO3 remaining in the boiler water. Nice pH too.

Your 300-psi Waste Heat Recovery Boiler has twice what I would expect for Sodium Sulfite NaSO3 at ranging 80-ppm to 100-ppm. pH is good so you are getting a good yield.

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