凝结水自动泵
CONDENSATE WATER AUTOMATIC PUMP
基本知识 WDV20凝结水自动泵属于一种压力控制泵，主要设计用于不使用电力来泵送冷凝水或其它流体的场合。与传统的电力输液泵相比，冷凝水控制泵特别适用于“困难”介质的输送，如高温冷凝水或腐蚀性流体。压力操作的泵，特别是冷凝水自动泵被公认为是长寿命，很少维修的泵。这种泵由于没有旋转的密封结构，没有电动机和泵叶轮，通常使用寿命是传统电动泵的五到十倍，同时省去了大量的一般性维修。
1、把高温凝结水送回锅炉，节省锅炉给水化学处理剂，减少锅炉给水再加热的费用。
2、不需要电气维修。
3、可安全用于危险的或爆炸性的环境。
4、根据不同的型号，可以用5到250psig（1.72Mpa）表压力的蒸汽，压缩空气或其他气体操作控制。
5、疏液量可达48,000磅/小时（22,000千克/小时）。
Basic knowledge
WDV20 condensate water automatic pump belongs to a sort of pressure control pump, designed for the occasion where condensate water and other fluid are pumped through the way beyond electric power. Compared with conventional infusion pump, condensate water control pump is very suitable for transmission of “Difficult” medium, such as high temperature condensate water or corrosive fluid. Pressure controlled pump, particular in condensate water automatic pump, are recognized as long-life pump with seldom maintenance needed. The pump is five to ten times the life of traditional ones due to its absence of electromotor, pump impeller and rotary seal structure, at the same time, general maintenance of it will be saved dramatically.
1.It’s necessary to return high-temp condensate water into boiler, in order to save boiler water supply and chemical treating agent, and reduce boiler water supply and the cost of reheating.
2.No need to carry out electrical maintenance.
3.It could be used safely in dangerous and explosive environment.
4.It may be used in gauge pressure with capacity from 5 to 250 Psig (1.72Mpa) according to different types, and compressed air or other air operation and control.
5.Lyophobe may reach maximum volume of 48,000 pounds/hour (22,000Kg/hr)
运行
冷凝水自动泵靠蒸汽或压缩气体排出液体。浮球连到连杆和弹簧上，同时驱动进气阀和排气阀。充液循环中，进气阀关闭，同时排气阀打开，使冷凝水充入泵体内。当浮球随液位升高到其行程的顶点时，开关控制机构释放弹簧，打开进气阀，关闭排气阀。蒸汽或压缩气体流入泵内，排出液体。装在泵进口和出口的逆止阀，使液体在对应的道路方向上流动。
Operation
Condensate water automatic pump discharges liquid by depending on steam or compressed air. Float ball will be linked to connecting rod and spring, simultaneously, drive intake valve and exhaust valve. The intake value will shut down during circulation of liquid charging, at the same time, exhaust valve will open, enabling condensate water into the pump. As the float ball rise with the liquid up to the peak of its journey, the switch control system will set spring free and open intake valve, as well as close exhaust valve. Steam and compressed air subsequently flow into pump and discharge liquid. The check valve that fixed at intake of exhaust of pump will drive the liquid flowing in opposite path.
特性
疏液能力取决于几个参数。应注意的是冷凝水自动泵排出的是间断液流，总排液量取决于循环的快慢。驱动压力的大小和流动路线上的阻力是排水能力的明显成因和限制因素。其次是逆止阀的CV值、充入液体的压力或压头、排气管路的阻力以及驱动气体的特性。
自动泵没有“真空”侧，只有入口侧。重要的是要懂得冷凝水自动泵这种类型的泵不会抽入或吸入流体。介质必须借助重力流入泵内。压力或压头越高，入口逆止阀的CV值越大，其次是排气阀的CV值越大，则循环的充液阶段完成的越快。完成充液阶段后，控制机构将关闭排气阀打开进气阀。这时蒸汽或压缩气体会排出泵体内的液体。影响循环排液阶段速度的因素包括驱动蒸汽或气体的压力、出口逆止阀的CV值、下游的背压，可能还有流动介质和周围环境的温度（如果蒸汽用作驱动气体的话）。这最后一个因素经常被忽略，但事实是，蒸汽会被冷凝，从而减少实际的驱动压力，在某些应用场合，这一现象还很严重。
Characteristic
Lyophobe capacity is determined by several parameters. The thing to be noticed is the fact that it’s discontinuous liquid that condensate water automatic pump released is, the amount of liquid discharging should rest with the speed of circulation. The size of driving pressure and resistance of flowing path are distinct elements and limiting factors. Secondly, it should be attributable to some factors, such as CV value of check valve, the pressure or head of charging liquid, resistance of exhaust pipe, and characteristic of driving gas.
Automatic pump only has entrance side, and no “Vacuum” side. The key issue is that we should be conscious of the fact that such automatic pump in this kind could not pump and suck fluid inside. Medium should flow into the pump in virtue of gravity. The more pressure or head is, more bigger the CV value of check valve is, secondly, more bigger the CV value of exhaust valve is, the more faster the pace of completion of side circulation will be. Upon completion of liquid charging, control system will shun down exhaust valve and open intake valve. At the moment, steam and compressed gas will expel the liquid from pump. There are some factors influencing velocity of circle discharging of liquid, including driving the pressure of steam or air, CV value of check valve of exit back valve, downstream back pressure, along with possibility of flowing medium and temperature of surroundings (In case of taking steam as driving air). The last factor is often ignored, but the fact is that steam will be condensed, therefore, reduce actual driving pressure, such phenomenon could be very serious on some applications.
凝结水集水罐
传统的电动冷凝水泵一般都需要一个冷凝水收集器，其容积可以使冷凝水冷却并排出闪蒸蒸汽。这是很必要的，因为泵的吸口可能降低压力，使得高温冷凝水被抽吸流过泵叶轮时发生沸腾。这种现象叫作气穴现象，会很快使叶轮气蚀，损坏。虽然一般情况下流动介质的温度不成为问题，但必须记住冷凝水自动泵排液是不连续的循环。在控制泵排液时，泵内加有压力，不能接收液体。如果流体介质以连续的方式排向自动泵，则必须安装有足够容积的收集器，容纳控制泵排液期间所积存的冷凝水。否则，冷凝水会回顶，可能增加压力，引起故障。
Collecting tank of condensate water
Generally, conventional electric condensate water pump needs a collector of condensate water, the cubage of it may function as cooling the condensate water and discharging flashed steam. It’s essential, for the suction of pump may reduce the pressure, which could boil the condensate water flowing pump impeller after pumping. Such phenomenon is being called as cavitation，resulting in cavitation erosion and damage of impeller in fast manner. Under most of circumstances, no problem will be occurred relating to the temperature of flowing medium, however, the fact must be remembered that condensate water automatic pump discharges liquid in discontinuous circulation. In addition, control pump equipped with additional pressure added within, which could not accommodate liquid when discharging liquid. It’s necessary to install a collector with adequate capacity in case of continuous discharge of flowing medium toward automatic pump, which may contain the condensate water that reserved in the course of liquid discharging from control pump. Otherwise, the condensate water will return to the top level, causing increment in pressure, ultimately led to trouble.
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凝结水自动泵
CONDENSATE WATER AUTOMATIC PUMP
泵的工作原理图Schematic diagram of pump operation
■蒸汽 ■凝结水
凝结水自动泵选型指南
为了正确选择凝结水自动泵,以满足实用的要求,需要一些具体数据:
1、冷凝水负荷,kg/hr*
2、可提供的驱动压力(空气或蒸汽)
3、总扬程,英尺(液压头)
4、回液管的压力
5、可供充液压头,英寸(建议最小压头为12英寸)
Guidance for selecting condensate water automatic pump
Some specific data are required for choosing proper condensate water automatic pump, in order to meet practical requirement:
1.The load of condensate water, ,kg/hr*
2.Available driving pressure (air or steam)
3.Total head, feet (hydraulic head)
4.The pressure of return pipe
5.Available pressure head of liquid charging
例一 蒸汽驱动
1、冷凝水负荷,4,000lb/hr(1,800kg/hr)
2、可用蒸汽压力:50psig,表压(0.34 Mpa)
3、总扬程:20ft(6.1m)
4、回水管压力:10psig,表压(0.069 Mpa)
5、可供充水压头:12″(0.30m)
充水压头不等于12″时,泵的疏水能力应乘以按表三查得的修正系数.
Example 1 steam driving
1.The load of condensate water, 4,000lb/hr(1,800kg/hr)
2.Available steam pressure: 50psig, gage pressure (0.34 Mpa)
3.Total head: 20ft(6.1m)
4.The pressure of return pipe: 10psig, gage pressure (0.069 Mpa)
5.Available pressure head of liquid charging: 12″(0.30m) 50psig, guage pressure (0.34 Mpa)
Pressure head of liquid charging is not equivalent to 12″, water dispensing capacity should multiply the correction coefficient out of table 3.
例二 空气驱动（已知条件同例一）
1、为了确定空气的疏水能力修正系数，用驱动压力MP去除例一中得出的总背压BP（BP÷MP）19÷50=38%从表二中查得修正系数为1.10
2、用修正系数去除需要的冷凝水负荷。4000÷1.10=3636从泵的疏液能力表（表一）中选得1″×1″冷凝水泵。
example 2 air driving (Known condition is the same as example 1)
1.In order to confirm the correction coefficient of water dispensing capacity of water, driving pressure MP should be taken to divide back pressure out of example 1 (BP÷MP) 19÷50=38% the correction coefficient of table 2 is 1.10
2.Using correction coefficient to divide required load of condensate water. 4000÷1.10=3636 selected 1″×1″condensate water pump out of the table showing pump capacity of liquid dispensing (Table 1).
解:
1、计算总背压。总背压等于总压头的英尺数乘以0.433,再加上回水管压力。
（20ft×0.433）+10psig表压=19
2、从泵的疏液能力表中选择驱动压力50psig表压，总背压大于19（25）psig表压下的1″×1″凝结水泵。
Explanation
1.Computing of total back pressure. Total back pressure equals to feet of total pressure head multiplies 0.433, then add pressure of return pipe. （20ft×0.433）+10psig gage pressure=19
2.Single out driving pressure out of the table showing pump capacity of liquid dispensing, total back pressure exceeds 1″×1″condensed water pump under gage pressure of 19（25）psig.
单位换算系数
GPM换算成lbs/hr:GPM×500
Lbs/hr换算成GPM：Lbs/hr×0.002
Lbs/hr换算成kg/hr:Lbs/hr×0.454
conversion coefficient of unit
Converted GPM into lbs/hr:GPM×500
Converted Lbs/hr into GPM：Lbs/hr×0.002
Converted Lbs/hr into kg/hr:Lbs/hr×0.454
