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MSTR(BB4) high pressure boiler feed water pump



Application

It is suitable for metallurgical, mining, electric power, boiler water supply, petrochemical process, light industry and other industries of national economy, especially for the boiler water supply of power units of 6000 kW, 12,000 kW, 25,000 kW, 50,000 kW, 125,000 kW.


Performance

Flow: Q=15 ~ 700 m³/h, Head: H=140 ~ 2400m, Speed: N =2980r/min, Design pressure: P=25MPa, Operating temperature: T=-30℃ ~ +210℃.


Transmission Medium

MSTR series high pressure boiler feed water pump is suitable for conveying clean or slightly polluted medium, hot or cold water. It is especially suitable for the following special applications: boiler feed water below 210°C, starting feed water pump as a general purpose thermal power plant, high pressure water for general industry, petrochemical processes.


Design features

1、High strength Casing design. Centerline support, improve thermal stability and nozzle load; The positioning seat and guide seat are specially designed for high temperature medium to limit the thermal deformation direction of the unit. The shell can be made by casting and forging according to the specific working conditions. O-ring seals are used between the shells, and EPDM rubber rings are used to ensure sealing under all transient conditions.
2、Optimize impeller and guide vane design. The head single suction impeller and double suction impeller can be selected. The double suction impeller has better cavitation performance. Suction inlet design, reduce the generation of air bubbles; Precise casting impeller to ensure hydraulic performance; Different hydraulic model groups are designed for each specification to ensure that the operating point is within the range of 80%-110% of the optimal efficiency point and that higher efficiency and lower operating cost can be achieved in a wide operating range.
3、Axis design and arrangement. Large shaft diameter and impeller diameter ratio to ensure stable operation of the unit; Transfer enough torque to minimize deflection.
4、Rotor design. The impeller adopts step-by-step positioning installation to prevent shaft bending under high temperature conditions; Interlaced keyway, uniform transmission of torque, impeller blade interlaced layout, to prevent resonance; The half clamps bear the axial load to ensure that the axial force of each blade wheel is distributed on the shaft to avoid the ultimate load on a certain section. The installation procedure is simple.
5、Fluid dynamic pressure bearing design. Provide forced lubrication system and self-lubrication two forms of lubrication, according to the specific conditions can be flexible choice; The bearing has a long life and has been verified by practice. The shaft seal adopts bearing isolator, which reduces pollution, improves sealing effect, prolongs bearing life and is easy to install; Carbon steel bearing housing 360° connection, lower vibration, higher pump stability.
6、Axial force balance design. The balance drum can balance more than 95% of the axial force. The double-sided fluid dynamic pressure thrust bearing and the balance drum interact with each other to balance the axial force, which can withstand the change of axial force in two directions and adapt to the influence of the change of working conditions on the pump set. Balance drum device has no axial clearance, no axial contact friction risk, easy maintenance, improve the operation of field maintenance; The balance drum adopts spiral barrier seal to reduce the leakage and ensure the efficiency of the pump set. At the same time, the design of vortex elimination hole is added to ensure the stable operation of the rotor, even if the internal wear can still ensure the stable operation.

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