DG how to determine the model selection of the type of boiler feed water pump and calculate the flow head

DG type boiler feed water pump is in the role of the main equipment, main can be used for filling water, water supply of boiler operation, to meet the normal demand, so the selection of DG type boiler feed pump when the flow and head is very notable place, so how to determine and calculate?

1, the determination of DG type boiler feed pump discharge head

1) Boiler feed pump flow calculation:

Q = k ( Q1+Q2)

type: Q - The flow rate of the boiler feed pump m3 / h.

       Q1— The supplied steam boiler is the most helpful load total yield, m3 / h

Q2 - Other water use, such as continuous drainage, regular blowdown and attemperator, m3 / h.

       k— Coefficient of 1. 1 ~ 1. 2

       ( 2) Boiler feed pump lift calculation:

H = H1, H2 and H3 + H4

type: H - Boiler feed pump head, m

H1 - Boiler is used in design under the pressure of the relief valve opening pressure, MPa;

       H2— Economizer and water supply pipeline system, the resistance of the MPa;

       H3— Water supply system of the highest and lowest water level difference, MPa;

       H4— Other

3) Boiler feed water pump should be set standby, when the biggest a feed water pump stop running, the rest of the total flow, should be able to meet all the boiler operation at the rated capacity required for 110% of the water; When the boiler room is equipped with cooling device or thermal storage, the total capacity of the boiler feed water water pump should be included in the water.

       ( 4) One or more of the same boiler, steam pressure, can choose to run in parallel with two or more feed water pump, water supply, if the mother tube can choose two pump with a case, then the frequency conversion water supply.

2, DG type boiler feed water pump flow head calculation example

I company two 25 t/h of saturated steam boiler in the selection of feed water pump is according to the above methods are selected.

       2. The feed water pump flow

(1 1) The most helpful: steam load Q1 = 26. 1t/h( According to the production process to calculate) ;

       ( 2) Periodic blowdown and continuous blowdown shall use 13% of the boiler steam flow, namely the Q2 = 3. 39 t / h;

       ( 3) Standby coefficient, k = 1. 2;

       ( 4) Feed water pump flow: calculate Q = k ( Q1+Q2) = 1. 2×( 26+26×13%) = 35. 26 t/h

check water water pump samples, and 35 t/h to 25 t/h and 46 t/h, so choose 46 t/h.

       2.

2 boiler feed water pump head ( 1) Boiler is used in design of pressure relief valve opening pressure:

H1 = 1. 6×1. 6 = 1. 7MPa

       ( 2) Economizer and water supply pipe resistance:

H2 = 0. 21MPa

       ( 3) Water supply system of the highest and lowest water level difference:

H3 = 0. 08MPa

       ( 4) Other:

H4 = 0

5) Computation to the boiler feed pump head:

H = H1, H2 and H3 + H4 = 173 + 21. 2 + 8. 8 + 0 = 203 m

check sample feed water pump, pump head to 200 m, because of traffic for 46 t/h, is bigger than the actual 35 t/h, but through the flow up head, so the flow of 200 m meet conditions were determined.

boiler feed pump type determine according to the 46 t/h feed water water pump flow, head of 200 m, check the boiler feed water pump samples, determine models: DG46 - 50 x 4, two with one case.

J&T INDUSTRY CO.,LTD. is always trying to better understand the submersible pump of innovation, so we can help companies lead the industries.
If you are interested in , click J&T INDUSTRY to see some items with features that you will be amazed at.
Loyalty programs provide an opportunity to learn the preferences of customers and design communication strategies that will resonate with submersible pump.