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渣浆泵与单螺杆式多相泵的区别

作者:admin 发布日期:2021-01-03 16:45:02 关注次数:59

单螺杆式多相泵
    杆式多相泵由弹性定子和金属转子组成(2-4),一般用于井内人工举生系统,同时也可用于进或地面多相增压系统通常道用于小流量(气水总流量大于19.875m3/h)

增压低(最大压力2.76MPa)的工况。可以应用于介质内含固率较高的场合.但是必须定期更换定子。
2. 双螺杆式多相泵
    目前现场应用较多的双螺杆式多相泵的设计思路是:在开采与输送高黏原油的普通双杆液体泵的基础上,吸收了喷油双螺杆气体压缩机(实质为含气率97% ~99%油气混输泵)的螺杆型线设计和转子加工等关键技术后发展起来的,也称为高压型双螺杆泵,如图2-5所示。

单螺杆泵
结构单头阳螺旋转子在特殊的双头阴螺旋定子内偏心地转动(定子是柔性的),能沿泵中心线来回摆动,与定子始终保持啮合
特点(1)可输送含固体颗粒的液体;(2)几乎可用于任何黏度的流体,尤其适用于高黏性和非牛顿流体;(3)工作温度受定子材料限制
适用范围流量:0.03~ 450m3/h;排出压力:< 20MPa;操作温度:- 20~150C ;介质黏度:≤10°mPa . S;固体含量:40% ~70%(颗粒的体积含量);颗粒尺寸小于e(e为螺杆截面圆心与轴线的偏心距);纤维长度小于0. 4t(t为螺杆的螺距)
应用场合广泛用于化工、石油、污水处理、日用化工、建筑、造纸、纺织以及食品等

 

双螺杆泵
结构有两根同样大小的螺杆轴,一根为主动轴,一根为从动轴,通过齿轮传动达到同步旋转
特点:(1)流量和压力波动小,可由转速调节流量;(2)螺杆与泵体以及螺杆之间保持0.05~0.15mm间隙;(3)可输送含有微小颗粒物的液体和腐蚀性介质,并且噪声小,寿命长:(4)填料箱只受吸压力作用,泄漏量少;(5)泵的排出压力取决于输出管路系统的压力,可能达到的排出压力取决于螺杆螺纹的螺距数;(6)具有自吸能力,启动前无需灌泵;(7)适于输送一定黏度的液体,并可气液两相混输
适用范围:流量:0.3~ 2000m3 /h;排出压力:≤4MPa,非对称曲线齿形可达8MPa;工作温度:≤250°C ;介质黏度:1~1500mm2/s,降低转速后可达100000mm2 /s
应用场合:用于润滑油、润滑脂、原油、燃料油及其他高黏性油

三螺杆泵
结构: 由一根主动螺杆和两根与之相啮合的从动螺杆所构成
特点:(1)结构简单,无需齿轮传动(2)螺杆不承受弯曲载荷,可制得很长,最因此可获得高压力; (3)不宜输 送含600pum 以上固体杂质的液体; (4)可高速运转,是一种体积小的大流量泵,容积效率高; (5)填料箱仅与吸入压力相通,泄漏量少; (6)可气液两相混输
适用范围:流量:0. 25 ~ 1000m2/h大可达2000m3 /h;排出压力:一般≤25 MPa.    最大达70MPa;    操作温度:≤280°C;介质黏度:5~ 500mm2/s,降低转速后可达2400mm2/s;  允许最大颗粒:600um以下
应用场合:用于输送润滑油、液压油、重油、燃料油、柴油、汽油、液体蜡以及黏度较小的合成树脂等。还可用于离心式压缩机、大型泵等机组的润滑油泵和密封油泵

双螺杆式多相泵的转子副由两根互不接触的螺杆组成,通过硬化处理过的直齿圆柱同步齿轮传递扭矩。该泵在设计上利用气体的压缩性成功地降低回流损失,提高了泵的容积效率,并将轴向推力、噪声、压力脉动以及泵的振动等不利因素降低到最小范围,因此具有较好的效率和运行特性。

目前Bornemann公司和Lestritz 公司生产的陆上用双螺杆式多相泵已有系列产品。如Lestritz公司的L4MKL4HK 系列产品,Bornemann公司生产的MWMHPMPC各类多相泵,已有几十台双螺杆式多相泵运行在美国、加拿大、德国、中国委内瑞拉巴西等国家的陆上和海上油田,并取得了良好的效果。
双螺杆式多相泵的主要特点如下:

(1)渣浆泵在输送介质的含气时,仍可以达到较高的容积效率和好的增压

(2)主动轴依靠齿轮驱动从动轴,而不是靠螺杆传动,所以螺杆间能保持定间,在一定程度上减小磨损和允许细小沙粒通过,同时流体从侧流入泵体,从上流出,使内存有定量液体,具有短时间(30min左右)的抗干转能力:
    (3)般适用于中小流量(10~500m3/h)和中高等增压(0~ 10MPa)的场合:

(4)特别适用于存在黏度变化、腐蚀等附加载荷情况下的多相输送;

(5)对固体颗粒较为敏感,整体重量和体积相对较大;

(6)双螺杆式多相泵转子加工需要设计专门的刀具刃形

(7)需要液体自循环系统,当出口温度高于95°C,需要考虑独立的冷却系统。

Single screw multiphase pump

The single screw multiphase pump is composed of elastic stator and metal rotor (Fig. 2-4). It is generally used in the artificial lift system in the wellbore. It can also be used in the inlet or surface multiphase pressurization system. It is usually used for small flow (the total flow of oil, gas and water is more than 19.875m3 / h)

When the pressure is low (the maximum pressure is 2.76mpa). It can be used in the case of high solid content in the medium, but the stator must be replaced regularly.

2. Twin screw multiphase pump

At present, the design idea of the twin-screw multiphase pump, which is widely used in the field, is developed on the basis of the common twin-screw liquid pump for the exploitation and transportation of high viscosity crude oil, and after absorbing the key technologies such as the screw line design and rotor processing of the oil injected twin-screw gas compressor (essentially the oil-gas mixed pump with the gas content of 97% - 99%), also known as the high-pressure twin-screw pump, as shown in Figure 2-5.

Single screw pump

Structure: the single head male screw rotor rotates eccentrically in the special double head female screw stator (the stator is flexible), and can swing back and forth along the center line of the pump, and always keep meshing with the stator

Features: (1) it can transport liquid containing solid particles; (2) it can be used for almost any viscosity fluid, especially for high viscosity and non Newtonian fluid; (3) the working temperature is limited by stator material

Scope of application: flow rate: 0.03 ~ 450m3 / h; discharge pressure: < 20MPa; operating temperature: - 20 ~ 150C; medium viscosity: ≤ 10 ° MPa. S; solid content: 40% ~ 70% (volume content of particles); particle size less than e (E is the eccentricity between the center of screw section and axis); fiber length less than 0.4t (t is the screw pitch)

Application: widely used in chemical industry, petroleum, sewage treatment, daily chemical industry, construction, papermaking, textile and food, etc

Double screw pump

Structure: there are two screw shafts of the same size, one is the driving shaft and the other is the driven shaft, which achieve synchronous rotation through gear transmission

Features: (1) small fluctuation of flow and pressure, flow can be adjusted by rotating speed; (2) screw and pump body and screw keep 0.05 ~ 0.15mm gap; (3) it can transport liquid and corrosive medium containing micro particles, with low noise and long service life; (4) stuffing box is only affected by suction pressure, with less leakage; (5) The discharge pressure of the pump depends on the pressure of the output pipeline system, and the possible discharge pressure depends on the number of screw pitch; (6) it has self-priming capacity, so it does not need to fill the pump before starting; (7) it is suitable for conveying liquid with certain viscosity, and can be mixed with gas and liquid

The results show that the working pressure is less than or equal to 100000m3 / mm2, the discharge pressure is less than or equal to 100000m3 / mm2, the discharge pressure is less than or equal to 1.0m3/mm2, the discharge speed is less than or equal to 100000m3 / mm2, the discharge pressure is less than or equal to 1.0m3/mm2 and the discharge speed is less than or equal to 1.0m3/mm2

Application: for lubricating oil, grease, crude oil, fuel oil and other high viscosity oil

Three screw pump

Structure: it is composed of a driving screw and two driven screws meshed with it

Features: (1) simple structure, without gear transmission; (2) the screw does not bear bending load, can be made very long, so it can obtain high pressure; (3) it is not suitable to transport liquid containing more than 600 pum solid impurities; (4) it can operate at high speed, it is a small large flow pump with high volumetric efficiency; (5) the stuffing box is only connected with the suction pressure, with less leakage; (6) it can be gas-liquid two-phase mixed transportation

Scope of application: flow rate: 0.25 ~ 1000m2 / h, up to 2000m3 / h; discharge pressure: generally ≤ 25MPa, up to 70MPa; operating temperature: ≤ 280 ° C; medium viscosity: 5 ~ 500mm2 / s, up to 2400mm2 / s after speed reduction; maximum allowable particle size: below 600um

Application: used for conveying lubricating oil, hydraulic oil, heavy oil, fuel oil, diesel oil, gasoline, liquid wax and synthetic resin with low viscosity. It can also be used for lubricating oil pump and sealing oil pump of centrifugal compressor, large pump, etc

The rotor pair of twin-screw multiphase pump is composed of two non-contact screws, which transmit torque through hardened spur gear. In the design of the pump, the compressibility of the gas is used to reduce the backflow loss, improve the volumetric efficiency of the pump, and minimize the adverse factors such as axial thrust, noise, pressure pulsation and pump vibration. Therefore, the pump has good efficiency and operation characteristics.

At present, bornemann company and leslitz company have produced a series of land-based twin-screw multiphase pumps. For example, the l4mk and l4hk series products of leslitz company, the MW, MHP and MPC multiphase pumps produced by bornemann company, and dozens of twin-screw multiphase pumps have been operated in the onshore and offshore oil fields of the United States, Canada, Germany, China, Venezuela and Brazil, and good results have been achieved.

The main features of the twin-screw multiphase pump are as follows:

(1) When the gas content of conveying medium is very high, it can still achieve higher volumetric efficiency and better pressurization;

(2) The driving shaft drives the driven shaft by the gear instead of the screw, so the screw can maintain a certain gap, reduce the wear to a certain extent and allow fine sand particles to pass through. At the same time, the fluid flows into the pump body from the pump side and flows out from the upper part, so that there is a certain amount of liquid in the pump, which has a short time (about 30 minutes) anti dry running ability

(3) It is generally suitable for medium and small flow (10 ~ 500m3 / h) and medium and high pressure (0 ~ 10MPa) occasions

(4) It is especially suitable for Multiphase Transportation in the presence of viscosity change, corrosion and other additional loads;

(5) It is sensitive to solid particles, and its overall weight and volume are relatively large;

(6) The special cutting edge shape is needed for the machining of the rotor of the twin-screw multiphase pump;

(7) When the outlet temperature is higher than 95 ° C, an independent cooling system should be considered.









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