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BNL series condensate pump

key word:Heat exchange element

Category:


Product description

BNL series condensate pump

 

1. Introduction

1.1. Purpose

SBNL series condensate pumps are suitable for the condensate system of 300 ~ 600MW Generating units. They can be used as condensate pumps or condensate booster pumps, and can also be used to transport other liquids similar to condensate.

1.2. Model meaning

SBNL**-##×&&

SBNL -- Code of cylindrical vertical condensate pump

**----------Outlet diameter nominal size (mm)

##--------------Nominal size of inlet diameter (mm)

&&----------------------Number of impeller stages

1.3. Structural features

1.3.1. Structural form: vertical multi-stage centrifugal pump with barrel bag shape

1.3.2. Structure description:

1.3.2.1. In order to make the pump have good anti cavitation performance, the first stage impeller plus front inducer (see Fig. 15-1) or double suction structure (see Fig. 15-2) are adopted

1.3.2.2. Axial guide vane is adopted. On the premise of meeting the performance requirements and ensuring enough stiffness, the transverse (radial) dimension of the pump is reduced, thus reducing the installation width of the pump set

1.3.2.3. The core pulling structure is adopted for the parts below the pump foundation, which makes the disassembly and repair of the pump convenient. In addition, the highest point of the inlet passage of the pump is provided with a vent hole.

1.3.2.4. According to the lowest operating water level of condenser and the installation elevation of condenser, the location of pump inlet can be arranged according to the needs of specific project

1.3.2.5. The axial force of the pump is mainly balanced by the balance hole and balance chamber on each stage impeller, and the remaining axial force is borne by the thrust bearing components, which has high reliability. The main advantages of the structure are that the center of gravity of the pump group is greatly reduced, and the operation stability of the pump is improved; when the bearing fault occurs in the pump set, it is easy to distinguish the responsibility; the pump and the motor are connected by elastic coupling, which is very convenient for installation and alignment.

1.3.2.6. The high polymer material AC-3 is used for the pump guide bearing, which has the advantages of water lubricated bearing, allowing dry start; it will be powdery after wear and will not draw wire, which can ensure the safe and stable operation of the system.

1.3.2.7. When the number of impeller stages is more than 4, the thrust bearing components adopt oil bath lubrication sliding bearing (see Fig. 15-3)

The axial force is borne by the thrust pad, and the radial force is borne by the guide bearing bush. The lubricating oil is No.20 steam turbine oil. The bearing cooling water volume is 0.8 ~ 1.2m3/h, the water pressure is 0.25 ~ 0.4MPa, the water quality is industrial purified water, and the water temperature is lower than 38.5 ℃. When the cooling water volume is less than 0.5m3/h or the water pressure is lower than 0.2MPa, it must be checked immediately. If it cannot be recovered within 30min, it should be shut down for treatment. PT100 or bimetallic thermometer is used for bearing oil temperature control. When the temperature reaches 70 ℃, it will alarm and stop when 80 ℃. The inlet and outlet of bearing cooling water is either inlet or outlet.

1.3.2.8. According to the user's requirements, the pump shaft seal can be floating seal, packing seal or mechanical seal.

Floating seal: as shown in Fig. 15-4, the axial contact surface of floating ring and seal sleeve is ground with high precision, and under the action of small spring and medium pressure difference, the tight axial seal is ensured. The throttling effect of the small radial clearance reduces the leakage of the sealing cooling water (introduced by the external water supply interface before the pump starts) to a small extent, which ensures the delivery efficiency of the pump and avoids the air inhalation. The external water supply system includes pipe joint (G3 / 8in), pipe, pressure gauge and regulating valve. Before the pump is started, the pressure of external water supply shall be regulated by the regulating valve to keep it at 0.25 ~ 0.4MPa. After the pump is started, the regulating valve shall be closed (the external water supply system and drain pipe are not included in the scope of supply). The external water supply volume is 0.6-1.0m3/h, the water pressure is 0.25-0.4MPa, and the water quality is condensate or desalted water. When the water volume is less than 0.5m3/h or the water pressure is lower than 0.20MPa, it should be checked immediately. If it can not be recovered within 20min, it should be shut down for treatment.

Packing seal: as shown in Fig. 15-5, after the pump unit is installed, adjust the packing gland bolt to make the packing deformation and radial size increase. The inside and outside of the packing respectively press the shaft sleeve and packing cavity to play a sealing role. When the pump is running, it can be adjusted continuously to control the leakage of sealing water at about 40 ml / min. Before the operation of the pump, start the sealing water supply system (at this time, the water supply has two functions: ① seal off the external air, so as to ensure the vacuum in the pump; ② keep the packing in a good lubrication state); the filling water volume of the packing is 5 ~ 10L / h, the water pressure is 0.25 ~ 0.40MPa, the water quality is similar to the medium (desalted water or condensate water), and the water temperature is not higher than 38.5 ℃. When the water volume is less than 4L / h or the water pressure is lower than 0.18MPa, the sealing water supply system should be checked immediately. If it can not be recovered within 20min, it should be shut down immediately for inspection.

Mechanical seal: as shown in Fig. 15-6, after high-precision grinding of the axial contact surface of the moving ring and the static ring, the tight axial seal is kept under the action of the spring in the sealing parts: the small friction surface clearance throttling reduces the liquid leakage to a small extent, and ensures the pump delivery efficiency; The lubrication and cooling of the friction surface is completed by introducing clean water (condensate or desalted water) by F. the inlet pressure is 0.4-0.6MPa, the external water supply is 0.8-1.2m3/h, and the temperature is lower than 38 ℃. The outlet water f 'should ensure that its return water pressure is 0.1 ~ 0.2MPa. Generally, the connecting pipe is directly connected to the degassing pipeline and led to the pump inlet. When the water pressure of water source is lower than 0.3MPa or the water volume is less than 0.5m3/h, it should be checked immediately. If it can not be recovered within 12h, it should be shut down for treatment. As long as the water quality of the water inlet is not in the form of water pressure D, the water quality can be ensured as long as the water quality is not in the form of water pressure D.

1.3.3. Description of important characteristics:

1.3.3.1. Good hydraulic design ensures high efficiency and wide range of high efficiency operation.

1.3.3.2. In order to make the pump have good cavitation resistance and long-term operation under low NPSH conditions, the first stage impeller of the pump is specially designed, such as adopting double suction impeller or installing front inducer, adopting American ASTM standard material CA-6NM, which has good cavitation resistance and casting performance, and ensures high cavitation performance of condensate pump and stable operation under variable load conditions. ,

1.3.3.3. On the premise of meeting the performance requirements and ensuring sufficient stiffness, the axial guide vane is adopted to reduce the transverse (radial) dimension of the pump, thus reducing the installation width of the pump unit.

1.3.3.4. The core pulling structure is adopted below the pump foundation, which makes the disassembly and repair of the pump more convenient. The highest point of the inlet passage of the pump is provided with a vent hole to ensure the start-up and operation of the pump.

1.3.3.5. According to the lowest water level and installation elevation of condenser, the position of pump inlet can be arranged according to the needs of specific project, and the pump has enough rigidity and strength.

1.3.3.6. The axial force of the pump is mainly balanced by the balance hole and balance chamber on each stage impeller, and the remaining axial force is borne by the thrust bearing components, which has high operation reliability and improves the stability of the pump during start-up and variable load operation.

1.3.3.7. The shaft seal of the pump adopts mechanical seal, and floating seal and packing seal can also be used according to the needs of customers.

1.3.3.8. The bearing parts of the pump are composed of thrust bearing and radial rolling bearing or sliding bearing structure (when the impeller number is more than 4).

1.4. Technical level and advantages

SBNL series condensate pump is a vertical multi-stage centrifugal pump with tubular bag shape. It is a standard series of products with improved design and cavitation performance according to the technical requirements of domestic power station, which is introduced by UK WEIR pump company. It has good operation efficiency and reliability. The basic point of pump structure design is to meet the reliability requirements of pump for power station. Therefore, in addition to the detailed design of structural strength and stiffness and the material selection and design of water guide bearing, the flexible coupling is used between the motor and the pump, and the main thrust bearing is arranged at the upper part of the system. CoMPared with the structural design of rigid coupling and main thrust bearing arranged on the top of the motor, the design of the pump structure is simple and reliable, The structure has obvious advantages

Motors and condensate pumps are products produced by different manufacturing processes and standards. It is very important to use flexible coupling as a technical interface between them for condensate pump, which is a vertical single foundation pump with large slenderness ratio

The flexible coupling reduces the requirements of the connection accuracy between the motor and the pump, simplifies the installation and maintenance of the pump unit, avoids the transverse vibration of the vertical pump caused by the connection setting accuracy of the rigid coupling, and avoids the main thrust bearing overload caused by the mutual interference of the axial dimension accumulation error of the motor and pump and the axial thrust If the unit vibrates, it is easier to determine the cause of vibration and to distinguish the technical responsibility, especially the more hidden vibration source, such as electromagnetic vibration of motor stator. In addition, the installation, disassembly and maintenance of the unit are convenient

The main thrust bearing of condensate pump adopts the oil lubricated tilting pad bearing produced by German RENK company. The special cooling water disc-shaped tube ensures the high reliability of the bearing.

 

2. Main technical parameters and product appearance

2.1. Main technical parameters (see table 15-1)

Table 15-1 main technical parameters of SBNL series condensate pump

Model Flow (m3/h)  Head (m) Shaft power (kW) Efficiency (%) NPSH (m) Speed (r/min) Rationed power (kW)
200/300SBNL(2) 355 63 83.4 73 1.9 1480 115
200/300SBNL(3) 95 124.1 74 155
200/300SBNL(4) 126 172.6 76 190
200/300SBNL(5) 158 210.3 78 225
300/400SBNL(2) 550 86 163.1 79 5 200
3O0/400SBNL(3) 130 243.4 80 300
300/400SBNL(4) 173 319.9 81 350
300/400SBNL(5) 217 396.4 82 480
3o0/400SBNL(6) 260 474.9 82 550
350/600SBNL(2) 870 90 273.4 78 3.2 350
350/600SBNL(3) 135 404.9 79 550
350/600SBNL(4) 180 539.8 79 630
350/600SBNL(5) 870 225 666.4 80 3.2 800
350/600SBNL(6) 270 799.6 80 1000
350/600SBNL(7) 315 932.9 80 1100
35/600SBNL(8) 360 1066.2 80 1250
350/600SBNL(2)-S 850 93 277.6 78 3.7 350
350/600SBNL(3)-S 140 412.6 79 550
350/600SBNL(4)-S 187 544.3 80 630
350/600SBNL(5)-S 234 681.1 80 800
350/600SBNL(6)-S 280 815 80 900
400/700SBNL(2) 1000 106 365.4 79 4.3 400
400/700SBNL(3) 159 541.3 80 630
400/700SBNL(4) 212 712.8 81 800
400/700SBNL(5) 265 880.1 82 1000
400/700SBNL(6) 318 1043.4 83 1250
400/700SBNL(7) 371 1217.3 83 1400
400/700SBNL(2)-S 106 365.4 79 400
400/700SBNL(3)-S 159 541.3 80 630
400/700SBNL(4)-S 212 712.8 81 800
400/700SBNL(5)-S 265 880.1 82 1000
400/700SBNL(6)-S 318 1043.4 83 1250
400/700SBNL(7)-S 371 1217.3 83 1400
450/800SBNL(2)-S 1500 150 756.5 81 5 900
450/800SBNL(3)-S 225 1120.9 82 1250
450/800SBNL(4)-S 300 1476.5 83 1600
500/900SBNL(2)-S 1760 180 1052.1 82 5.5 1250
500/900SBNL(3) 270 1559.2 83 1800
500/900SBNL(4) 360 2054.2 84 2300

2.2. Product appearance (see Fig.15-7, Fig. 15-8 and Fig. 15-9)

2.3. Materials of main parts and components of SBNL350-600 pump (see table 15-2)

Table 15-2 material of main parts of SBNL350-600 pump

Part Name Material Standard Code Part Name Material Standard Code
Outer cylinder 16Mn GB 699 Intermediate bearing pedestal QT500-7  
Water inlet horn QT500-7 GB 1348 Radial pad 20Mn2/2ChSnSb11-6 GB 699
Guide vane housing Q1500-7 GB1348 Thrust pad 20Mn2/ZChSnSb11-6 GB 699
Inducer chamber QT500-7 GB1348 Thrust ring 45 GB 669
Reducing shell QT500-7 GB 1348 Shaft sleeve 1Cr17Ni2 GB 1221
Water outlet shell QT500-7 GB1348 Throttle bushing 1Cr17N2 GB1221
Straight pipe 20 GB 699 Throttle sleeve QT500-7 GB 1348
Mouth ring QT500-7 GB 1348 housing HT250 GB9439
Shaft 35CrMo GB 3077 Foundation pad Q235A GB700
Inducer CA-6NM ASTM Motor frame 16Mn GB 699
First stage impeller CA-6NM ASTM Packing gland 16Mn GB 699
Secondary impeller (standard impeller) ZG1270-500ZG35) GB 11352 Floating ring 38CrMoA1 GB 3077
Guide bearing AC-3 GB 1348 Filler Teflon GB1348

 

3. Selection method

3.1. Performance parameters

For example, 4 × 300MW subcritical double adjustable extraction steam heating condensing steam turbine generator set of a power plant, according to the operation mode of the unit and relevant data, the flow and head range with the longest operation time probability of condensate pump are calculated. As the high efficiency area of condensate pump operation, the efficiency should be guaranteed. A working point in this area is reasonably selected as the operating point of condensate pump economic operation, and then the operating point is taken as the operating point of condensate pump efficiency assessment.

3.2. Site conditions

Each unit is equipped with two condensate pumps with 100% capacity, one for operation and one for standby. The condensate pump is vertical with core pulling structure, and its components can be disassembled and replaced. The pump case is designed as full vacuum type.

Under the condition of high vacuum, the condensate pump will pump out the condensate from the condenser hot well and deliver water close to the saturation temperature of condenser pressure.

3.3. Supply requirements

The auxiliary equipment, relevant pipelines and accessories within the scope of the unit body mainly include:

3.3.1. Water pump body.

3.3.2. Motor body (including electric heater, and at least 3 suppliers of asynchronous variable frequency motor shall be provided according to the requirements of technical specification, and their prices shall be quoted separately, and the highest price shall be included in the total price).

3.3.3. Frame, anchor bolt, nut and washer.

3.3.4. Cooling water, sealing water and other system pipes, valves, orifice plates and accessories required by the pump unit itself.

3.3.5. Coupling and accessories between water pump and motor.

3.3.6. Necessary thermal measurement, monitoring and protection system elements, local instruments and all accessories, etc

3.3.7. Counter flange and accessories of interface between equipment and pipeline

4. Selection examples

4.1. Form

Vertical, model 350 / 600 SBNL (7)

4.2. Purpose

Under the condition of high vacuum, the condensate pump will pump out the condensate from the condenser hot well and deliver water close to the saturation temperature of condenser pressure

4.3. Main technical parameters

4.3.1. According to DL 5000-2000 technical code for design of thermal power plants (code for large thermal power plants), the capacity of condensate pump is calculated: the maximum operating condition point is the rating plate operating point, under which the performance requirements of condensate pump flow, head and other aspects are guaranteed.

4.3.2. According to the unit operation mode and relevant data, the flow and head range with the longest operation time probability of condensate pump shall be calculated. As the high efficiency area of condensate pump operation, the efficiency shall be guaranteed. Reasonably select a working point in this area as the operating point of condensate pump economic operation, and then use this working point as the operating point of condensate pump efficiency assessment (see table 15-3).

Table 15-3 efficiency assessment of condensate pump

Itme Name plate condition Rated single extraction industrial extraction condition Double extraction condition
(maximum output) (economic operation condition) (winter)
Water temperature at water pump inlet(℃) 34.5 34.5 34.5
Specific gravity of mediumt/m3) 0.994 0.994 0.994
Pump inlet pressurekPa) 5.4 5.4 5.4
Water pump outlet flowt/h) 970 823 840
Pump outlet pressure (MPa) 2.95 3.25 3.22
Pump speedr/min) 1480 1480 1480
Efficiency% 80.2 81.5 81.3
NPSH required (m) (NPSHr of suction flange center line) 3.4 3.1 3.1
Pump rotating direction The pump coupling is viewed from the counter clockwise direction

 

4.3.3. Technical parameters of the motor (see table 15-4)

Table 15-4 technical parameters of motors supplied

Item Parameter
Rated powerkW) 1100
Rated voltagekV) 6
Rated speedr/min 1480
FrequencyHz) 50
Protection and structure IP44, moisture proof, totally enclosed, with heater

 

5. Scope of supply and general technical specifications

5.1. Scope of supply

5.1.1. Water pump body

5.1.2. Motor body (including electric heater, and at least 3 suppliers of asynchronous variable frequency motor shall be provided according to the requirements of technical specification, and their prices shall be quoted separately, and the highest price shall be included in the total price)

5.1.3. Frame, anchor bolt, nut and washer

5.1.4. Cooling water, sealing water and other system pipes, valves, orifice plates and accessories required by the system itself

5.1.5. Coupling and accessories between water pump and motor

5.1.6. Necessary thermal measurement, monitoring and protection system elements, local instruments and all accessories, etc

5.5.1.5. Interface between equipment and pipe

5.2. General technical specifications of products (see table 15-5)

Table 15-5 general technical specifications of products