2BW6E电厂高效成套装置
2BW6E power plant high efficiency complete set of equipment
2BW6E 高真空系列复合机组是我公司技术成熟的成套设备，具有运行安全可靠、结构紧凑、配套完善、工作范围广的显著特点。2BW6E 系列气冷罗茨真空泵+水环真空泵成套机组由2BE1 系列水环真空泵、气冷罗茨真空泵、换热器、控制元件、接线箱等部件组成。
2BW6E high vacuum series compound unit is a complete set of equipment with mature technology of our company. It has the obvious features of safe and reliable operation, compact structure, perfect supporting system and wide working range. 2BW6E series air-cooled Roots vacuum pump + water-ring vacuum pump complete set is composed of 2BE1 series water-ring vacuum pump, air-cooled Roots vacuum pump, heat exchanger, control components, junction box and other components.
工作原理
Operating principle
●普通罗茨泵工作原理
Working principle of normal Roots pump
●采用8字形转子与两个半圆形泵体。
Adopt 8 shape rotor and two semicircular pump body.
●该泵不能单独排气，只能与真空泵、旋片泵等串联配套使用
The pump can not exhaust gas alone, can only be used in series with vacuum pump, rotary vane pump, etc.
●可提高前级真空泵真空度，在有效的工作区域能够提高（系统）抽气速率。
Improves the vacuum of the front vacuum pump and increases the pumping rate in the effective working area.
●罗茨泵的极限压力由真空泵决定。
The ultimate pressure of roots pump is determined by vacuum pump.
缺点：
Shortage:
●工作区域较窄。
The working area is narrow.
●进出口压差较小（ 4Pa~1×105Pa）
Small inlet and outlet differential pressure (4 Pa~1×105 Pa).
●气冷式罗茨泵工作原理
Working principle of air-cooled Roots pump
●采用梅花形转子与两个半圆形泵体，依靠转子的挤压而产生较高的流速与压差。
Using a quincunx-shaped rotor and two semicircular pump bodies, depending on the extrusion of the rotor to produce a higher flow rate and differential pressure.
●部分排气口气体经过换热器冷却后回流对罗茨泵转子与泵体进行冷却，因此能长期工作。
Part of the exhaust gas through the heat exchanger after cooling backflow to cool roots pump rotor and pump body, so it can work for a long time.
●可形成5×10-2Pa~10×105Pa压差，可在高压差下长期稳定地工作。
A differential pressure of 5×10-2 Pa~10×105 Pa formulated, can work stably under high differential pressure for a long time.
●可获得接近于主泵的抽气速率，同时获得更高的真空。
The pumping rate is close to that of the main pump, and a higher vacuum can be obtained.
●可直接排大气（单独工作，只是轴功率较大）。
Can directly exhaust the atmosphere (allowed working alone, but the shaft power is larger).
●进出口差压较大，能有效弥补真空泵高真空出力不足的弱点。
The inlet and outlet differential pressure is larger, which can effectively make up for the weakness of vacuum pump high vacuum output.
缺点：
Shortage:
●启动时瞬时轴功率较大。
The instantaneous shaft power is larger when starting.
●为避免启动时产生过大瞬时功率，一般建议采用软启动（当配套电机30KW以上时）。
In order to avoid excessive instantaneous power when starting, it is generally recommended to use soft starting (when the matching motor is above 30 KW).
●水环真空泵工作原理
Working principle of water ring vacuum pump
●叶轮偏心地安装在椭园形泵体内。当叶轮按图示箭头方向旋转时，因离心力的作用，注入泵内的液体被甩向泵体内壁，形成一个形状与泵体相似，厚度接近相等的液环。随叶轮一起旋转的液环内表与叶轮轮毂之间形成一个月牙形的空间，当叶轮由A点转到B点时，两相邻叶片之间所包围的容腔逐渐增大，气体由外界吸入；当叶轮由C点转到A点时，相应的容腔由大变小，使原先吸入的气体受到压缩，当压力达到大气压力时，气体被排出。
The impeller is installed eccentrically in the oval pump casing. When the impeller rotates in the direction of the arrow shown on the casing, the liquid in the pump is thrown to the inner casing of the pump due to centrifugal force, forming a liquid ring of similar shape to the pump casing and nearly equal thickness. A crescent-shaped space is formed between the inner surface of the liquid ring rotating with the impeller and the impeller hub. When the impeller is transferred from point A to point B, the cavity surrounded by two adjacent blades gradually increases, and the gas is inhaled from the outside. When the impeller from point C to point A, the corresponding cavity from large to small, so that the original inhaled gas is compressed, when the pressure reaches the atmospheric pressure, the gas is discharged.
基本参数
Basic parameter
●最低吸入绝压：
Min. inlet AP: 4mbar
●功耗比：160~180m3/h·KW(一般真空泵：60-70m3/h·KW）
Power Consumption rate: 160~180m3/h·KW (Normal Vacuum pump：60-70m3/h·KW）
●产品概述
Product overview
2BW6E 高真空系列复合机组是我公司技术成熟的成套设备，具有运行安全可靠、结构紧凑、配套完善、工作范围广的显著特点。2BW6E 系列气冷罗茨真空泵+水环真空泵成套机组由2BE1 系列水环真空泵、气冷罗茨真空泵、换热器、控制元件、接线箱等部件组成。
2BW6E high vacuum series compound unit is a complete set of equipment with mature technology of our company. It has the obvious features of safe and reliable operation, compact structure, perfect supporting system and wide working range. 2BW6E series air-cooled Roots vacuum pump + water-ring vacuum pump complete set is composed of 2BE1 series water-ring vacuum pump, air-cooled Roots vacuum pump, heat exchanger, control components, junction box and other components.
应用范围
Application area
适应抽吸压力（表压）范围：-0.0090~0.0099MPa(g)
Suitable for suction pressure (gauge pressure) range: -0.0090~0.0099 MPa(g)
基本配置
Basic configuration
●罗茨泵（气冷式）及配套电机(可选配变频调速电机)
Roots pump (air-cooled) and matching motor (optional variable frequency motor)
●进口气（电）动蝶阀
Imported gas (electric) butterfly valve
●压力开关——控制入口蝶阀开启
Pressure switch - controls the opening of the inlet butterfly valve
●压力变送器——控制机组联锁
Pressure transmitter - interlock of control unit
●入口手动调节阀——调节系统进气量
Inlet manual control valve - adjust the system intake volume
●连接金属波纹管——连接罗茨泵与换热器
Connect metal bellows --connect Roots pump to heat exchanger
●双流程单壳体管式换热器——对水蒸气进行冷却
Double flow single shell tube heat exchanger --to cool water vapor
●真空回流管——对罗茨泵进行冷却
Vacuum return line - cooling Roots pump
●系统入口止回阀——防止真空倒灌
System inlet check valve - prevents vacuum backflow
●水环真空泵及配套电机——直联
Water ring vacuum pump and auxiliary motor - direct connection
●换热器——形成水环真空泵工作液闭式循环系统
Heat exchanger - water ring vacuum pump with working liquid closed circulation system
●气水分离器——进行气水分离
Gas-water separator - To separate gas and water
●磁翻板液位计（带高低液位开关并附远传及报警功能）
Magnetic plate level meter (with high and low level switch and remote transmission and alarm function)
●补充水装置——过滤器+减压阀+补水电磁阀+手动补水
Water replenishment device - filter + pressure reducing valve + water refill solenoid valve + manual water refill
●止回阀——气水分离及密封作用
Check valve - air water separation and sealing function
●电气控制柜——控制罗茨泵、真空泵
Electrical control cabinet - control Roots pump, vacuum pump
●接线端子盘——控制系统（远传DCS系统）
Terminal Block - Control system (remote DCS system)
●高液位排水阀——排水
High level drain valve - Drain water
●公用底座
Common base plate
结构特点
Structural feature
高效节能机组除了拥有罗茨泵、水环真空泵拥有的基本特点之外，还拥有：
In addition to the basic features of roots pump and water ring vacuum pump with high efficiency energy saving unit, it also has:
●气冷罗茨泵大多采用变频调速电机，以避免启动时出现过载。
Air-cooled Roots pump mostly adopts frequency conversion speed regulating motor to avoid overload when starting.
●罗茨泵设有两个回流口，它充分对转子及泵体冷却，气体回流量（5-12.5%，根据进出口差压大小自动调节）。
Roots pump is equipped with two reflux mouth, it fully cooling the rotor and pump body, gas flow back (5-12.5%, according to the size of the import and export differential pressure automatically adjusted).
●罗茨泵轴承冷却水直接与水气换热器进、排出口相连，无需外接水源。
Roots pump bearing cooling water is directly connected with the inlet and outlet of the water gas heat exchanger, no need external water source.
●在系统中加装水气换热器：一是对混合气体冷却，减少热量传递；二是使混合气体中的水蒸气迅速凝结成水，从而大大提高了真空泵的出力。
Add water and gas heat exchanger in the system: the first, it is to cool the mixed gas, reduce heat transfer. The second, the water vapor in the mixed gas condenses into water rapidly, thus greatly improving the output of the vacuum pump.
●采用特殊设计的水——气换热器（双相流，双管层），保证换热效果。
Adopt specially designed water - gas heat exchanger (double - phase flow, double - tube layer) to ensure the heat exchange effect.
●在水——气换热器底部设有一个溢流管，它利用真空泵的负压自动将气侧水抽出，保证换热效率。
At the bottom of the water-gas heat exchanger is provided with an overflow tube, which uses the negative pressure of the vacuum pump to automatically pump out the gas side water, to ensure the heat exchange efficiency.
●真空泵采用可靠的密封方式。
Vacuum pump adopts reliable shaft sealing.
●真空泵采用先进的防汽蚀装置。
Vacuum pump adopts advanced anti - cavitation device.
●真空泵采用可靠的补水装置。
Vacuum pump adopts reliable water refill device.
●可靠的高液位排水装置。
Reliable high level drainage device.
●磁翻板液位计（带远高低液位开关，可实现远传信号及高低液位报警功能）。
Magnetic flip plate level meter (with far high and low level switch, which can realize remote signal and high and low level alarm function).
●特殊设计汽水分离器。
Specially designed soda water separator.
●特殊设计的止回阀。
Specially designed check valve.
●多种现场观察仪表（真空表、压力表、温度表）。
Various field observation instruments (vacuum gauge, pressure gauge, thermometer).
●采用集装式、紧凑式设计——减少占地空间。
Adopt set - up and compact design to reduce footprint.
蒸汽喷射真空系统
Steam injection vacuum system
蒸汽喷射器，属于真空泵的一种，属于质量泵，也称蒸汽喷射泵或射汽抽气器，曾广泛应用于100MW以下机组的真空系统。优点是在高真空时能保证其抽吸特性。
动力蒸汽进入喷 嘴中产生压降，该压力能立即转换成速度能，以超音速通过椎体部分前端的混合喷嘴，使混合喷嘴内形成高真空，将凝汽器内的气汽混合物抽吸过来，并随同高速蒸汽一起进入扩散器；在扩散器中，蒸汽的流速降低，压力增加至设计值（水冷机组12~15kPa，直接空冷机组约24~28kPa）。
Steam ejector, a kind of vacuum pump, belongs to the Mass Pump, also known as steam jet pump or steam ejector, has been widely used in the vacuum system of 100MW units below. The advantage is that the suction characteristics can be guaranteed at high vacuum.
Power steam into the nozzle to produce pressure drop, the pressure can be immediately converted into speed energy, supersonic through part of the vertebral body at the front of the mixing nozzle, so that high vacuum is formed in the mixing nozzle, the air vapor mixture in the condenser suction, and along with the high-speed steam into the diffuser. In the diffuser, the flow rate of steam decreases and the pressure increases to the design value (12 to 15 kPa for water cooling units and about 24 to 28 kPa for air cooling units).
