On the boiler water pump type selection method and the matters needing attention

Along with the development of the industry in our country, many enterprises scale expands unceasingly, as provide power boiler also will increase, and the master of the boiler in the boiler industry enterprise professional people rarely, proficient in boiler auxiliaries are less, and this gives companies bring certain difficulty on boiler auxiliary selection, in order to avoid the use of equipment not file now big deviation in actual application, the following only for boiler water pump type selection of several applicable methods and matters needing attention are put forward.

boiler water pump type selection considerations (

1) Rotating shaft seal, as far as possible choose mechanical seals, especially the boiler feed water pump, such as the calculation packing seal while maintenance is simple, but the failure rate and maintenance frequency high workload big so should choose mechanical seal, life should be more than 8000 h.

      ( 2) On the boiler water pump motor is the power source of the water pump operation, such as failure occurs, the pump will not be able to run so the motor in structure and insulation class should meet the requirements of installation and use of the environment temperature to ensure the safe operation of the motor.

      ( 3) If choose frequency conversion water supply, the selection of pump head should be slightly higher than the design value of H. Because the pump running after 3 ~ 5 a, because of the impeller wear and clearance of expanding head would drop 20 ~ 30 m so should be around 30% higher than H to ensure normal water supply and water pump after years of good energy saving effect of input frequency converter, prolong the service life of pump.

      ( 4) The material of impeller, seal ring, and balance disc, should choose material of HT200 or higher Such as HT250 and HT300) 。

      ( 5) If the water temperature to room temperature, can need not

when chooses the special instructions; But if the water temperature > 100 ℃, should when choosing pumps emphasizes the feed temperature, because of the high temperature and low temperature pump in the selection of material, structure, and prevent cavitation function will be different.

boiler feed water pump model parameter selection of

1) Feed water pump flow calculation:

Q = k ( Q1+Q2)

type in a boiler feed pump flow Q, m3 / h.

Q1 a most helpful for boiler steam load total yield, m3 / h.

Q2 other water use, such as continuous drainage, regular blowdown and attemperator, m3 / h. 1 k spare coefficient. 1 ~ 1. 2ε

      ( 2) Boiler feed pump lift calculation

H = H1, H2 and H3 + H4

type m H a boiler feed water pump head in

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

H2 an economizer and resistance of water supply pipeline system MPa

H3 - Water supply system of the highest and lowest water level difference MPa

H4 one other.

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

      ( 4) One or more of the same boiler, steam pressure, can choose two or more than one run in parallel with the feed water pump, water supply, if the mother tube can choose two pump with a case, then the frequency conversion water supply, this not only reduce electricity consumption, but also make the water pressure stable, although one-time investment relatively large by variable frequency energy saving measures, and 3 ~ 4 years will pay back your investment.

      ( 5) Feed water pump driven by steam turbine is the emergency pump flow should be able to 淸 foot all the boiler operation at the rated capacity required for 20% ~ 40%. Only in a level of power load of the boiler feed water pump stop running and will not result in the boiler water shortage, don't set the steam feed pump, general industrial enterprise of power station boiler room does not have such conditions must be set.

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