ZDG-type medium-pressure boiler feed pump

Overview:

The boiler feed pump as high pressure boiler feed water or other water supply purposes, the transmission medium temperature does not exceed 160 ℃. (The pressure does not exceed 105 ℃)

Performance range:

Flow rate: Q = 100 ~ 580m3 / h (DG High)

                Q = 36-180m3 / h (medium-pressure high-pressure)

                Head: H = 740 ~ 2150m (high pressure)

               H = 409-1056m (time pressure)

                H = 270-672m (in press)

Structure: This pump is a single-stage multi-stage centrifugal pump casing section. The intake and outlet are vertically upward. Front, middle and rear section connected with the wear bar into one, each section depends mainly on the joint surface between the stationary seal the metal surface outside, and with 0-type rubber ring as a secondary seal. DGB-type high-pressure pump suction, middle, spit out the use of forgings segment.

Seal: medium-pressure pump used as a carbon fiber woven fabric with soft padding and cooling water cooling. High-pressure pump soft packing seal. DG45-80, DG85-80 pump mechanical seal can be applied. Packing gland, packing chamber cooled with cooling water. With the seal at the sleeve can be replaced to protect the shaft. High-pressure pump seal soft packing seal, with the cooling water cooling, but also mechanical seal according to user needs. Medium-pressure pump rotor to the shaft ends of the rolling bearing. Oil lubrication, and use recycled water cooling, the rotor axial thrust balancing disk using automatic balance. After a balanced equilibrium return back to return to the pump suction pipe segment. High-pressure pump rotor shaft bearings at both ends to support. Oil lubrication, and cooling with a circulating water, the use of the rotor axial thrust balancing disk balancing. Balance between the front room and back with water. High-pressure pump rotor from the pump to support both ends of the sliding bearings. Bearings with forced lubrication, the oil pump itself is equipped with the system, the rotor axial thrust balancing disk used to balance. And with a thrust bearing to withstand changes in working conditions because of residual axial force, the balance between the chamber body and the suction pipe with return pipe.

Bearing and balancing devices: medium-pressure pump rotor to the shaft ends of the rolling bearing. Thin oil lubrication. And cooled with circulating water. The rotor axial thrust to balance the self-balancing. After a balanced equilibrium return back to return to the pump suction pipe segment.

High-pressure pump rotor shaft bearings at both ends to support. Oil lubrication, and cooling with circulating water. Using the rotor axial thrust balancing disk balancing. Balance between the front room and back with water.

High-pressure pump rotor from the pump to support both ends of the sliding bearings. Bearings with forced lubrication, the oil pump itself is equipped with the system. The rotor axial thrust balancing disk used to balance. And with a thrust bearing. To withstand changes in working conditions because of residual axial force. In the balance between the chamber body and the suction pipe with return pipe.

Transmission: the pressure • high-pressure pump driven by motor through flexible coupling. Direction from the drive, the pump is clockwise. High-pressure pump driven by motor through flexible coupling can also be equipped with a gear according to user needs-based coupling, diaphragm coupling, hydraulic coupling. Small steam turbine prime mover can be taken or motor drive. Direction from the drive, the pump is clockwise.

Materials:

Medium-pressure pump materials:

Inhalation section, spit, middle ... ... ... ... ... ... high quality steel

    Guide vanes, impeller, ... ... ... ... ... ... ... ... ... ... chrome steel

    Balance disc, balance sets ... ... ... ... ... ... ... ... ... chrome steel

    Vane sets, sealing rings, ... ... ... ... ... ... ... ... Cr-Mo steel

    Axis ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... Cr-Mo steel

High-pressure pump materials:

Front, middle, back ... ... ... ... ... ... ... high-quality carbon steel

Guide vanes, impeller, bearings ... ... ... ... ... ... ... high-quality carbon steel

Impeller (DG150-100) ... ... ... ... ... stainless steel

Impeller gear sets, sealing rings, guide vanes sets ... ... ... stainless steel

High-pressure pump materials:

Inhalation section, spit segment, guide vanes, the impeller ... ... ... ... ... ... carbon steel or chrome steel

Shaft, sealing rings, guide vanes sets ... ... ... ... ... ... chrome vanadium steel or chrome steel