How to Extend the Use of Finned Tube?

The long-term use of items are inseparable from the maintenance and maintenance, finned tube is no exception, then what are the specific aspects of finned tube maintenance?

In order to extend the use of finned tube, first of all, you should regularly check whether the finned tube is intact, whether there are deposits, coking, water rust layer and other scales attached, and immediate cleaning. At the same time it is also necessary to check the finned tube and rubber gasket bonding is precise, rubber gaskets themselves are ready to avoid rubber gasket degumming and damage caused by leakage.

Finned tube as a heat exchange element, long-term work in high temperature flue gas conditions, finned tube is divided into the whole finned tube, welded finned tube, high-frequency welded finned tube and mechanically connected finned tube. Plate heat exchanger compression nut and upper and lower guide bar, should often add lubricating grease for lubrication.

The adjustment of each instrument should be operated by a person and operated and maintained in strict accordance with the operating procedures; each time the finned tube is re-pressed, the scale position of the last pressing shall be recorded, do not make the rubber washer pressure excessively, so as to reduce the use of the rubber ring time.

Replacement of the finned tube rubber gasket, the section shall be renewed in its entirety, so as not to uneven gap, affecting the results of heat transfer. In short, the use of gas furnace special finned tube to pay attention to the maintenance and maintenance, will reduce the occurrence of early failure, extend the use of time, improve the effectiveness of the operation, bring more benefits.

In general, when circulating water is used at the beginning of operation, slight leakage may occur. When the temperature rises to the sterilization temperature, the leak will disappear automatically. If the leak does not stop, the finned tube must be pressed again. If it still does not work, the rubber gasket should be opened and checked. It is also possible that the finned tubes are not in the numbered sequence on the fins and this should be corrected.

To extend the use of finned tubes, start from the following aspects

1. Selection of material optimization

Selection of corrosion-resistant materials: according to the use of the environment (such as humidity, high temperature, corrosive gases, etc.), select stainless steel, copper, aluminum alloy or composite coating materials, to avoid accelerated aging of carbon steel in a corrosive environment.

Adopt anti-corrosion coating: spray epoxy resin, zinc-aluminum alloy, ceramic coating on the surface, etc., to improve anti-oxidation and anti-acid and alkali properties.

2. Structure and process improvement

Optimize fin structure: Choose reasonable fin thickness and fin pitch to reduce the possibility of dust accumulation and blockage, while maintaining good heat transfer performance.

Welding quality control: Use high quality welding technology (such as high frequency welding, brazing) to improve the bonding strength of the fins and reduce the problems of shedding and loosening.

3. Use and maintenance management

Regular cleaning: remove dust, oil, corrosion products on the surface of the fins to prevent the heat exchange efficiency from decreasing and corrosion from increasing.

Can use compressed air, water washing, chemical cleaning methods, depending on the circumstances of the choice.

Anti-corrosion protection: Avoid electrochemical corrosion caused by contact with other metals during installation. Cathodic protection (such as magnesium rods, zinc blocks) can be used to cathodically protect the finned tube.

Avoid drastic temperature changes: Rapid alternation of heat and cold may lead to fatigue cracks in the weld joints or materials, and maintaining a stable operating environment will help prolong life.

4. Environment and Operation Monitoring

Control the purity of the working medium: Regularly replace or filter the working medium to prevent scaling and corrosion.

Monitoring of operating pressure and temperature: to avoid overpressure or over-temperature operation caused by material fatigue or burst.

Prevent external damage: such as preventing people from stepping on, foreign objects impact, installation stress and other man-made damage.

5. Regular maintenance and replacement program

Setting up overhaul cycle: establish maintenance files and set up overhaul points according to running hours and working conditions.

Localized replacement: Replace individual fins or tube segments in time when localized damage is found to prevent damage from expanding.