凝結水自動泵
CONDENSATE WATER AUTOMATIC PUMP
基本知識 WDV20凝結水自動泵屬于一種壓力控制泵，主要設計用于不使用電力來泵送冷凝水或其它流體的場合。與傳統的電力輸液泵相比，冷凝水控制泵特別適用于“困難”介質的輸送，如高溫冷凝水或腐蝕性流體。壓力操作的泵，特別是冷凝水自動泵被公認為是長壽命，很少維修的泵。這種泵由于沒有旋轉的密封結構，沒有電動機和泵葉輪，通常使用壽命是傳統電動泵的五到十倍，同時省去了大量的一般性維修。
1、把高溫凝結水送回鍋爐，節省鍋爐給水化學處理劑，減少鍋爐給水再加熱的費用。
2、不需要電氣維修。
3、可安全用于危險的或爆炸性的環境。
4、根據不同的型號，可以用5到250psig（1.72Mpa）表壓力的蒸汽，壓縮空氣或其他氣體操作控制。
5、疏液量可達48,000磅/小時（22,000千克/小時）。
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)
運行
冷凝水自動泵靠蒸汽或壓縮氣體排出液體。浮球連到連桿和彈簧上，同時驅動進氣閥和排氣閥。充液循環中，進氣閥關閉，同時排氣閥打開，使冷凝水充入泵體內。當浮球隨液位升高到其行程的頂點時，開關控制機構釋放彈簧，打開進氣閥，關閉排氣閥。蒸汽或壓縮氣體流入泵內，排出液體。裝在泵進口和出口的逆止閥，使液體在對應的道路方向上流動。
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
疏液能力取決于幾個參數。應注意的是冷凝水自動泵排出的是間斷液流，總排液量取決于循環的快慢。驅動壓力的大小和流動路線上的阻力是排水能力的明顯成因和限制因素。其次是逆止閥的CV值、充入液體的壓力或壓頭、排氣管路的阻力以及驅動氣體的特性。
自動泵沒有“真空”側，只有入口側。重要的是要懂得冷凝水自動泵這種類型的泵不會抽入或吸入流體。介質必須借助重力流入泵內。壓力或壓頭越高，入口逆止閥的CV值越大，其次是排氣閥的CV值越大，則循環的充液階段完成的越快。完成充液階段后，控制機構將關閉排氣閥打開進氣閥。這時蒸汽或壓縮氣體會排出泵體內的液體。影響循環排液階段速度的因素包括驅動蒸汽或氣體的壓力、出口逆止閥的CV值、下游的背壓，可能還有流動介質和周圍環境的溫度（如果蒸汽用作驅動氣體的話）。這最后一個因素經常被忽略，但事實是，蒸汽會被冷凝，從而減少實際的驅動壓力，在某些應用場合，這一現象還很嚴重。
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.
凝結水集水罐
傳統的電動冷凝水泵一般都需要一個冷凝水收集器，其容積可以使冷凝水冷卻并排出閃蒸蒸汽。這是很必要的，因為泵的吸口可能降低壓力，使得高溫冷凝水被抽吸流過泵葉輪時發生沸騰。這種現象叫作氣穴現象，會很快使葉輪氣蝕，損壞。雖然一般情況下流動介質的溫度不成為問題，但必須記住冷凝水自動泵排液是不連續的循環。在控制泵排液時，泵內加有壓力，不能接收液體。如果流體介質以連續的方式排向自動泵，則必須安裝有足夠容積的收集器，容納控制泵排液期間所積存的冷凝水。否則，冷凝水會回頂，可能增加壓力，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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凝結水自動泵
CONDENSATE WATER AUTOMATIC PUMP
泵的工作原理圖Schematic diagram of pump operation
■蒸汽 ■凝結水
凝結水自動泵選型指南
為了正確選擇凝結水自動泵,以滿足實用的要求,需要一些具體數據:
1、冷凝水負荷,kg/hr*
2、可提供的驅動壓力(空氣或蒸汽)
3、總揚程,英尺(液壓頭)
4、回液管的壓力
5、可供充液壓頭,英寸(建議最小壓頭為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 蒸汽驅動
1、冷凝水負荷,4,000lb/hr(1,800kg/hr)
2、可用蒸汽壓力:50psig,表壓(0.34 Mpa)
3、總揚程:20ft(6.1m)
4、回水管壓力:10psig,表壓(0.069 Mpa)
5、可供充水壓頭:12″(0.30m)
充水壓頭不等于12″時,泵的疏水能力應乘以按表三查得的修正系數.
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 空氣驅動（已知條件同例一）
1、為了確定空氣的疏水能力修正系數，用驅動壓力MP去除例一中得出的總背壓BP（BP÷MP）19÷50=38%從表二中查得修正系數為1.10
2、用修正系數去除需要的冷凝水負荷。4000÷1.10=3636從泵的疏液能力表（表一）中選得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、計算總背壓？偙硥旱扔诳倝侯^的英尺數乘以0.433,再加上回水管壓力。
（20ft×0.433）+10psig表壓=19
2、從泵的疏液能力表中選擇驅動壓力50psig表壓，總背壓大于19（25）psig表壓下的1″×1″凝結水泵。
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.
單位換算系數
GPM換算成lbs/hr:GPM×500
Lbs/hr換算成GPM：Lbs/hr×0.002
Lbs/hr換算成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
