2BWD Liquid Ring Vacuum Pumps And Compressors
The complete set of water ring vacuum pump equipment is a closed cycle unit used for vacuuming power plant condensers. During the start-up vacuum pumping stage, the vacuum pumping time of the unit is significantly shorter than that of vacuum equipment such as steam jet pumps. During the vacuum stage, the pumping capacity of the equipment changes synchronously with the back pressure of the condenser, ensuring the optimal output of the generator set regardless of summer, winter, or peak shaving conditions. Simple automatic control and reliable structural design ensure the normal operation of the condenser. The unit has high efficiency, low maintenance, and low operating costs. The complete set of water ring vacuum pump equipment is widely used in both water-cooled and air-cooled units.
2BWD Liquid Ring Vacuum Pumps And Compressors
Complete product line
Provide single pump and various integrated complete sets of units to meet different needs.
Excellent quality
The excellent processing system and reliable quality system ensure the excellent quality of the products.
Advanced product design
Optimized hydraulic design, wide efficient zone, energy-saving and environmentally friendly single-stage impeller, flat disc structure design, reliable operation, and easy maintenance.
Widely applicable
The product is widely used in fields such as electricity, chemical industry, papermaking, tobacco, coal, mining, pharmaceuticals, food production, and sugar production.
- Representation method
- 2BWD flow chart
Example of a complete set of water ring vacuum pump equipment: 2BWD353-0EK4-590
| 2BWD | Vacuum pump unit series code (matched with 2BEX series pumps) | ||||||
| KVA-D | Vacuum pump unit series code (matched with KVA series pumps) | ||||||
| KVC-D | Vacuum pump unit series code (matched with KVC series pumps) | ||||||
| KVDP-D | Vacuum pump unit series code (matched with KVDP series pumps) | ||||||
| 353 | Pump specification code | ||||||
| 0 | The minimum suction absolute pressure of the pump is 33hPa | ||||||
| B | The pump body, impeller, and distributor are made of cast iron and carbon steel | ||||||
| E | The impeller material is 304 | ||||||
| H | The impeller material is 316 | ||||||
| F | The impeller material is 316L | ||||||
| K | The unit is not equipped with an atmospheric injector | ||||||
| L | Unit configuration with atmospheric injector | ||||||
| 3 | Sealing of external water supply packing | ||||||
| 4 | Internal water supply packing seal | ||||||
| 5 | Single end internal water supply mechanical seal | ||||||
| 6 | Single end face external water supply mechanical seal | ||||||
| 590 | Pump speed | ||||||
The complete set of 2BWD+P injectors has sufficient pumping capacity at very low suction absolute pressure. When the power plant is operating in peak shaving mode, using this unit can establish a very low back pressure in the condenser and improve the efficiency of the generator set. The injector does not consume the power of the unit and can automatically switch on and off according to changes in working conditions. For example, under an environmental pressure of 101.3kPa, when the cooling water temperature is 15 ℃, the ultimate vacuum of all water ring vacuum pumps can only be drawn to -98kPa, and at this point, the water in the pump chamber is already in a state close to boiling. The complete set of 2BWD+P injectors can be easily drawn-100.3kPa. At this point, the pump chamber is at -90kPa, which is much higher than the vaporization pressure at this water temperature. There will be no cavitation and the pump can operate smoothly.
Roots water ring vacuum unit is a unit composed of Roots vacuum pump and small water ring vacuum pump connected in series. Roots pump is a vacuum pump that can withstand high pressure difference and high compression ratio, and can operate over a wide pressure range. After using this pump, smaller water ring pumps can be configured, and the maximum pressure can reach about 1KPa, greatly saving energy. Especially during harsh working conditions in summer, the increase in water temperature has little impact on the performance of the unit, and the pumping efficiency is higher than that of the water ring vacuum unit, with stable pressure. For the characteristic of requiring stable vacuum degree inside the condenser, Roots water ring vacuum unit has better economy and practicality.
Advanced performance
The use of ANSYS software for fluid analysis of hydraulic models has expanded the efficient operating area and improved hydraulic efficiency.
The pump structure is suitable for the variable operating conditions of power plants, with a unique flexible exhaust port design. Adapt to different pressure regions, automatically adjust the exhaust angle, avoid over compression, effectively reduce energy consumption, and enable the pump to operate efficiently throughout the entire suction range; Meet the changes in winter and summer operating conditions of the power plant.
Manufacturing Excellence
• The impeller is cast as a whole, with a smooth surface and a profile that perfectly matches the design. The use of stainless steel material can enhance the strength of the impeller and improve its anti cavitation performance.
• The distributor is processed using CNC machine tools, and the position of the suction and exhaust holes is accurate to ensure the efficiency of pump operation.
Optimized unit design
（1）Two water curtains pre-cool the air intake
Most of the gas sucked by the vacuum pump from the condenser is water vapor. A spray device is installed at the suction inlet of the pump to form the first water curtain. The air inlet of the distributor is formed by the diffusion of working fluid replenishment into the pump chamber. The second water curtain, the two water curtains condense the water vapor extracted from the condenser, the non-condensable gas cools and shrinks, and the gas volume shrinks, which greatly improves the suction capacity of the pump.
（2）Anti cavitation device
Introducing appropriate gas at the initial stage of pump compression forms a thin gas protective film on the surface of the impeller, effectively improving the pump’s resistance to cavitation during operation under high vacuum and preventing cavitation from occurring. Reduced vibration and noise, extended impeller service life.
（3）Overflow device
Connected pipe design, no need to install overflow valve, no backpressure, safe and reliable.
（4）Water replenishment device
The high-pressure water replenishment solenoid valve is interlocked with the liquid level switch to timely replenish liquid and ensure that the device does not run out of water.
Complete and reliable configuration
Famous manufacturer’s automatic valve: quick opening and closing, reliable sealing
Pressure switches from well-known brands: accurate instructions, reliable and durable
Renowned brand heat exchangers: compact design with high heat transfer efficiency
Magnetic flap level gauge: Clear on-site display, remote liquid level alarm
The impeller and pump body are in an eccentric configuration, with both ends sealed by distributors. An appropriate amount of liquid is injected into the pump. When the impeller rotates, a rotating liquid ring with a thickness close to equal is formed along the pump body wall. The inner surface of the liquid ring, the surface of the impeller hub, and the end face of the distributor form a crescent shaped working cavity, which is divided into several cavities of varying sizes by the impeller blades. As the impeller rotates, the volume of the small cavities on the suction side gradually expands, and the pressure inside the cavity decreases. The cavity sucks in from the outer boundary through the suction hole, and gradually rotates towards the exhaust side. The volume of the cavity gradually decreases, and the gas is compressed. When the pressure reaches atmospheric pressure, Gas is discharged through the exhaust port, completing the three stages of suction, compression, and exhaust. During work, a portion of the working fluid will be discharged with the gas, so it is necessary to continuously inject a certain amount of fresh working fluid into the pump. To ensure the normal operation of the pump. The most commonly used working fluid is water.
