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.
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.
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.
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.
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.
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.
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.
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.