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列管式冷凝器的连接方式及其胀管胀紧水平的方式

人气:2 评论:0 日期:2019-08-02 13:29:42

列管式冷凝器中的换热器材质是低肋翅片紫铜管,并采用横向折流板,纵向紊流板结构及机械胀管等制造工艺。在实际使用过程中,要冷却相同流量和初始温度液压油,采用规格相同的两台列管式冷凝器,并且还要有各自独立的水路,相同流量和进口温度的冷却水。通常情况下,这两台列管式冷凝器既可以并联使用,也可以串联使用。如果要是使出油口得到低温的油流,串联连接方式比并联连接方式效果好。因为当列管式冷凝器串连接时,油的流程速度加快使换热系数将加大,换热量变大;而且油的流程变长,相当于换热面积也增大,所以换热量也会增强。

The heat exchanger in tubular condenser is made of copper tube with low fin, and the manufacturing technology of transverse baffle plate, longitudinal turbulent plate structure and mechanical expansion tube is adopted. In the actual use process, the same flow rate and initial temperature hydraulic oil should be cooled, two tube-type condensers with the same specifications should be used, and the cooling water with the same flow rate and inlet temperature should also have their own independent waterways. Usually, the two tubular condensers can be used in parallel or in series. If the low temperature oil flow is obtained at the oil outlet, the series connection is better than the parallel connection. Because when the tubular condenser is connected in series, the heat transfer coefficient will increase and the heat transfer capacity will increase with the acceleration of the oil flow rate, and the oil flow will become longer, which corresponds to the increase of the heat transfer area, so the heat transfer capacity will also increase. 

但要注意的是,当列管式冷凝器串联运行时,必须确保前面一台冷凝器的换热效率要高于后一台的换热效率。当然这种方式也会存在一些缺点,比如说油的速度加快、流程变长,流程的阻力损失会变大,油泵消耗的功率也要变大。

However, it should be noted that when the tube-and-tube condenser is running in series, it is necessary to ensure that the heat transfer efficiency of the former condenser is higher than that of the latter. Of course, this method also has some shortcomings, such as faster oil speed, longer process, greater resistance loss of the process, and greater power consumption of the oil pump.

而若是采用串联的连接模式,不能将两台列管式冷凝器交替检修,一旦其中一台设备出现问题而导致系统停运的话,整个系统的可靠性会随之降低不少。所以不论是串联使用还是并联使用都各有各的优点,这需要我们结合实际情况来进行衡量。

If the series connection mode is adopted, two tubular condensers can not be overhauled alternately. Once one of the equipments fails and the system shuts down, the reliability of the whole system will be reduced a lot. Therefore, whether in series or in parallel, each has its own advantages, which requires us to measure the actual situation.

列管式冷凝器的设计其实非常特别,它是一个空管,蒸汽可以通过;包含许多小管,这些小管从冷凝器顶部延伸到底部,垂直分布,直径一般约为30mm,长度2.5-3.5m;小管从底部到顶部用冷水泵送,进入列管式冷凝器的蒸气在穿过冷凝器的管子产生撞击并凝结。

The design of tubular condenser is very special. It is an empty tube through which steam can pass. It contains many small tubes, which extend from the top to the bottom of the condenser and are vertically distributed. The diameter of these tubes is generally about 30mm and the length is 2.5-3.5m. The small tubes are pumped by cold water from the bottom to the top, and the vapor entering the tubular condenser is passing through. The tube of the supercondenser collides and condenses.

这种冷凝释放出潜在的热量,加强酒体和铜之间的相互作用,去除多余的硫化物并将一些铜溶解到酒液中。因为铜通过不断的反应可以保持清洁,以便进行更多的反应。

This condensation releases potential heat, enhances the interaction between the body and copper, removes excess sulfides and dissolves some copper into the liquor. Because copper keeps clean through constant reactions in order to react more.

在列管式冷凝器进行胀管胀紧水平的时候,可以用肉眼观测管板孔周边附近地区。由于弹性变形和轻微塑性变形,产生径向45度的金属流线和氧化皮裂纹,氧化皮开始脱落,这种现象表明它有一定水平的膨胀。

When the tube expanding and tightening level of tubular condenser is carried out, the area around the tube plate hole can be observed with naked eye. Due to elastic deformation and slight plastic deformation, metal streamlines and oxide scales with 45 degree radial cracks are produced, and oxide scales begin to fall off. This phenomenon indicates that it has a certain level of expansion.

当膨胀管时,管束冷凝器管的壁由于管沿径向膨胀而变薄。当被管孔限制时,金属轴向流动,这增加了延伸穿过管板的管孔的长度。胀度越大,边伸长量越长,依据测定管子向外是伸长量大小来大概分辨出胀紧水平。

When the tube expands, the wall of the tube bundle condenser becomes thinner because the tube expands along the radial direction. When confined by the hole, the metal flows axially, which increases the length of the hole extending through the tube sheet. The bigger the expansion is, the longer the elongation of the side is. According to the measurement of the elongation of the tube outward, the level of expansion and tightening can be roughly distinguished.

还可以采用扭矩控制法。手工胀管时,作业者可凭经验,依据加给胀管器的扭矩大小,决策胀紧水平。若选用电动胀管器,可依据操纵电机输出扭矩的大小操纵胀紧水平,当扭矩达到标准值时,装置自动终止工作。

Torque control method can also be used. When expanding pipe manually, the operator can decide the level of expansion according to the torque added to the expander. If electrically operated pipe expander is selected, the expansion level can be controlled according to the magnitude of the output torque of the motor. When the torque reaches the standard value, the device automatically terminates work.

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