Introduction of four fluorine heat exchange
One or four fluorine heat exchanger (fluorine plastic heat exchanger)-Full name PTFE heat exchanger, heat exchange and transfer in chemical production process is realized by heat exchanger. In the heat exchange, there are often some strong corrosive oxidation of the material, therefore, the corrosion-resistant materials must be used to manufacture heat exchangers. At present, the commonly used materials are graphite, ceramics, PTFE Tetrafluoroethane Heat Exchanger glass and other non-metallic materials and stainless steel, titanium, tantalum, zirconium and other metal materials made. However, with graphite and other non-metallic materials made of heat exchanger has fragile, easy to corrosion, large size and other shortcomings, with titanium, tantalum, zirconium and other rare metals made of heat exchanger, the price is very expensive, stainless steel is intolerable many strong corrosive medium, PTFE Tetrafluoroethane Heat Exchanger and produce intergranular corrosion and pollution of products.
Second, PTFE heat exchanger (fluorine-plastic heat exchanger) Characteristics:
1, because PTFE is a chemical inert material, in addition to the high-temperature elements of fluorine, molten alkali metal, trichloroethylene, uranium hexafluoride, all fluorine kerosene, PTFE Tetrafluoroethane Heat Exchanger almost all of the media can work. Such as: Concentrated hydrochloric acid, hydrofluoric acid, sulfuric acid, nitric acid, phosphoric acid, acetic acid, oxalic acid, caustic soda, sodium hypochlorite, benzene, xylene, acetone, aqua regia, chlorine, toluene, all kinds of organic solvents and so on.
Good stain resistance
2, due to the chemical inertia of PTFE tube, surface smoothness, winding and high expansion coefficient, so that its heat transfer surface is difficult to scale, PTFE Tetrafluoroethane Heat Exchanger greatly reducing the number of equipment maintenance, to ensure a relatively stable coefficient of heat transfer and production of long-term operation.
Long life and comprehensive cost low
Because there is no photosensitive gene in PTFE, it has excellent weathering resistance to the atmosphere. In the strong corrosive medium its service life is 20 to 30 times times of stainless steel, PTFE Tetrafluoroethane Heat Exchanger plus eliminates the maintenance, the accident is caused by the loss, its comprehensive cost is definitely lower than other heat exchangers.
3. Good heat transfer performance
Because the heat exchanger adopts thin-walled tube, it overcomes the disadvantage of low thermal conductivity of PTFE material, so its total heat transfer coefficient can reach $number (w/㎡k). At present, my unit used the enhanced heat transfer technology, can do thick wall, large hole of the heat exchanger, PTFE Tetrafluoroethane Heat Exchanger so that its pressure greatly improved, so that its total heat transfer coefficient also increased, (can reach 350w/㎡k).
Compact volume with small mass and light structure
The heat exchanger uses thin-walled thin tube, thus the Heat Exchanger unit volume of the heat exchange area is particularly large, up to 600M2/M3 (25X3 steel pipe production only 130m2/m3). In addition, the weight of plastic is very light, so in transport, installation, maintenance is very convenient.
Third, PTFE heat exchanger (fluorine-plastic heat exchanger) technical indicators and precautions
1, the use of temperature: -50℃~200℃
2, using the pressure tube process ≦0.4MPa, Shell ≦0.4MPa
3, "weld" Shear strength T﹥6x106pa
Four, PTFE heat exchanger (fluorine plastic heat exchanger) Note
1, feed, discharge pipe weight can not be pressed on the joint, so as to avoid damage to the joint and the head between the wire.
2. The ball head nut (cover nut) cannot be subjected to force.
3, before using, PTFE Tetrafluoroethane Heat Exchanger the ball head nut is slightly tight (the transportation process may be easy).
4. When using, open the cooling water valve first, and after the shell is filled, the material should be cooled in the process.
5, the material particle diameter can not be greater than the diameter of 1/4, so as to avoid clogging F4 pipe
6, enhancement, shell agenda can not have iron filings, small glass and other substances into, lest damage F4 pipe.
7, storage, will be in and out of the water seal, PTFE Tetrafluoroethane Heat Exchanger in order to avoid foreign body damage F4 pipe.