Application of pump products in power station
Pump products directly applied in the field of power stations are commonly referred to as power station pumps. Among the numerous products in the pump industry, power station pump is a very important type of product. It has high technical content, large product specifications and high product price. In addition to a small number of military products, it is the most important type of pump product. In the power station system engineering is also a very important mechanical equipment, power station pump in the development of the power industry has a very important role.
Power station pump a wide variety of USES, significant role. The classification of power station pump is first divided according to the type of power station, and then in the type of each power station, according to its use to carry out a detailed classification, the following are introduced by the power station, nuclear power station pump.
(1) pump diagram 1-1 is a schematic diagram of thermal system of thermal power station, which can be divided into:
Boiler feed water pump
The boiler feedwater pump usually USES the DG horizontal multistage centrifugal pump, this series of pumps is the horizontal single suction multistage segmental centrifugal pump, may transport the clear water or the physical chemistry nature similar to the clear water the liquid, is suitable for the middle, the low pressure boiler or the high pressure boiler feed water, also is suitable for the factory or the city high pressure feed water drainage. The medium temperature of 2 0 0 ℃ to 15 ℃, import allowed pressure is less than 0. 6 M P a.
This series of pumps adopt the hydraulic model of high efficiency and energy saving products recommended by the state. It has the advantages of high efficiency, wide performance range, safe and stable operation, low noise, long life, easy installation and maintenance, etc.
Our company has a strict and standardized control system for product design, production and service in strict accordance with the IS 0 0 1:2000 quality system, and the product quality IS fully guaranteed.
DG type pump inlet and outlet are vertical upward, through tightening bolts to pump inlet, middle, outlet, bearing body and other pump shell parts are connected into one. Choose the pump grade according to the pump head. This series of pump rotor is mainly composed of shaft and impeller, shaft sleeve, balance disc and other parts mounted on the shaft. The number of impeller is determined according to the pump grade. The parts on the shaft are fastened with flat keys and shaft nuts so that they are integrated with the shaft. The entire rotor is supported by rolling or sliding bearings at both ends. Bearing according to the type of different, do not bear the axial force, the axial force balance by the balance plate. The rotor is allowed to swim axially in the pump housing during the pump operation, so the centripetal ball bearing is not allowed. The rolling bearing is lubricated with grease, the sliding bearing is lubricated with thin oil, and the ring is lubricated with white oil and cooled by circulating water. The sealing surface between the inlet section, the middle section and the outlet section of the pump is sealed with molybdenum disulfide grease. The sealing ring and guide vane sleeve are installed between the rotor part and the fixed part for sealing. When the wear degree of the sealing ring and guide vane sleeve has affected the working performance of the pump, it shall be replaced. The seal form has the mechanical seal and the packing seal two kinds. Pump packing seal, packing ring position to the right, the tightness of the packing must be appropriate to the liquid can drip out. Pump all kinds of sealing elements installed in the sealed box, the box into a certain pressure of water, water seal, water cooling or water lubrication. A replaceable shaft sleeve is installed in the shaft seal to protect the pump shaft.
Sub-high pressure pumps generally adopt sliding bearing and thin oil lubrication structure. Dg85-6, 7 and dg155-67 pumps can be lubricated with sliding bearing and thin oil, or with rolling bearing and dry oil lubrication structure. The other models adopt rolling bearing and dry oil lubrication structure. The main parts and materials of medium and low pressure pump generally adopt high quality cast iron, and the main parts of secondary high pressure pump adopt cast steel or stainless steel. This series of pumps are directly driven by prime mover through elastic coupling. From the prime mover direction, the pump rotates clockwise.
Two, front pump
Booster pump usually make ISW horizontal pipeline pump IS the Shanghai abundant pump valve manufacturing co., LTD. Company technical personnel joint domestic pump experts to choose domestic excellent hydraulic model, adopt IS type of centrifugal pump performance parameters, on the basis of the general vertical pump to design ingenious combination and become, at the same time according to different use of medium temperature and the use of occasions, the flow of material and structure changes, designed with ISWR type heat pump performance parameters. This series of products have the advantages of high efficiency, low noise and reliable performance.
ISW horizontal pipe pump with
1. Compact structure, the series of horizontal pump structure, machine pump, beautiful appearance, less floor area, compared with ordinary horizontal pump, floor area reduced by 30%. If IP54 outdoor motor is adopted, no pump room is needed and it can be put into outdoor use.
2. Smooth operation, low noise, high component concentricity. The motor and the pump are connected directly, which simplifies the intermediate structure and increases the stability of operation. The impeller has excellent dynamic and static balance, and there is no vibration and low noise during operation, extending the service life of the bearing and improving the service environment.
3. The shaft seal is made of high quality mechanical seal, and the moving and static rings are made of hard alloy.
4. Adopting advanced hydraulic model, it has high efficiency and good performance.
5. Unique structure, pump body under the side with water hole, inlet and outlet flange with pressure hole, to ensure the normal use and maintenance of the pump.
6. This series of horizontal pump inlet for the horizontal direction, the outlet for the vertical upward structure, for the convenience of pipeline layout.
Three, circulation pump
Circulating pump usually adopt type ISG series single stage single suction centrifugal pump, IS the unit of science and technology personnel joint domestic pump experts to choose domestic excellent hydraulic model, adopt IS type of centrifugal pump performance parameters, on the basis of the general vertical pump to design ingenious combination and become, at the same time according to different use, such as temperature, medium on the basis of type ISG derived for hot water, high temperature. This series of products have the advantages of high efficiency, low noise and reliable performance. In line with the latest national machinery department JB/ t53058-93 standard requirements. The products are designed and manufactured according to the international IS02858 standard. 93 years through the state ministry of mechanical industry pipeline pump products qualified.
ISG, IRG vertical pipe centrifugal pump features
1. Pump for vertical structure, the same diameter of the import and export, and located in the same Central Line, can be installed in the pipeline like a valve, compact appearance, small area, low construction investment, if added to the protective cover can be placed in the outdoor use.
2. The impeller is directly mounted on the lengthened shaft of the motor, with short axial size and compact structure. The pump and motor bearing are reasonably configured, which can effectively balance the radial and axial loads generated by the pump operation, thus ensuring the smooth operation of the pump and low vibration noise.
3 shaft seal mechanical seal or mechanical seal combination, the use of imported titanium alloy seal ring, medium high temperature mechanical seal and the use of hard alloy material, wear resistant seal, can effectively increase the service life of mechanical seal.
4. Easy installation and maintenance, no need to remove the pipeline system, as long as the pump coupling nut can be removed all rotor parts.
5. The series and parallel operation mode of the pump can be adopted according to the requirements of the operation, that is, the flow and head.
6. Vertical and horizontal installation of pump can be adopted according to requirements of pipeline layout.
In these types of pump products, the boiler feed pump is the most important, its technical content, high degree of automation, high temperature and high pressure. In recent years, in order to improve the system efficiency of generator sets, supercritical units and ultra-supercritical units have been installed successively, and the technical requirements for power station pumps are increasingly high.