Introduction to air cooler:

The air cooler is mainly used for the purpose of power plant steam turbine generator units and electric motors - closed circuit ventilation cooling. The air cooler can cool the medium (water, steam) after heat absorption, so as to facilitate the circulation of the medium. The working condition of the air cooler directly affects the output power and resistance to load fluctuations of the motor. Therefore, the correct selection and use of air coolers is an important link in ensuring the normal operation of the unit. The air coolers produced by our company are suitable for industries such as metallurgy, power, chemical, mining, and light industry machinery. Especially in areas with water scarcity or severe industrial water pollution, the use of air instead of water cooling liquids in air coolers reduces industrial water consumption and eliminates pollution, thus enabling the application of air coolers.

The air cooler adopts finned tube material for tube replacement -

Single metal finned tubes and bimetallic composite finned tubes

Single metal finned tubes are rolled from aluminum tubes as a whole, with contact thermal resistance, high strength, thermal and mechanical vibration, thermal expansion, and considerable expansion heat transfer surface. The heat exchanger made of this type of finned tube is a widely used heat exchanger. Double metal composite finned tube is a type of copper and aluminum tube (or steel pipe, aluminum tube; or stainless steel pipe, aluminum tube) that is rolled out after being composite. It has advantages such as tight bonding, low thermal resistance, heat transfer energy, high strength, small flow loss, strong corrosion resistance, and is not easy to deform under long-term cold and hot working conditions, as well as long working life. The integral rolled fins are prickly and wrinkled, easy to clean, and can easily remove condensation water on the surface of the fins during wet cooling in heating and air conditioning engineering. They are less prone to dust and scaling in drying heating and other heat exchange situations.

Our factory uses aluminum rolled finned tubes and bimetallic composite finned tubes for tube replacement. All surfaces have undergone anodizing treatment, resulting in a beautiful and elegant appearance, and effectively preventing surface corrosion.

-Single and bimetallic steel aluminum composite finned tubes for replacing tubes and finned tubes in industrial air coolers are welcome for customization. Detailed description:

Single and bimetallic steel aluminum composite finned tubes and aluminum rolled finned tubes are made by rolling aluminum tubes as a whole, with contact thermal resistance, high strength, thermal shock and mechanical vibration, thermal expansion energy, and considerable expansion heat exchange surface. Heat exchangers made of these finned tubes are suitable for series or wound heat exchangers. Copper aluminum composite finned tube is a type of finned tube made of copper and aluminum, which is rolled out after being composite. It has advantages such as tight bonding, low thermal resistance, high heat transfer energy, high strength, low flow loss, strong corrosion resistance, and is not easy to deform and work for a long time under long-term cold and hot working conditions. The overall rolled fins are smooth, prickly, wrinkled, and easy to clean. When wet cooling is used in heating and air conditioning engineering, condensation water on the outer surface of the fins is easily eliminated. It is not easy to form dust or scale in drying heating and other heat exchange situations.

The aluminum rolled finned tubes and copper aluminum composite finned tubes installed for air cooler tube replacement have both undergone anodizing treatment on their surfaces, resulting in a beautiful and elegant appearance, effectively preventing surface corrosion.

We can also use steel wound finned tubes or steel aluminum composite finned tubes according to user needs. Aluminum rolled finned tube specifications - Energy meter outer diameter D (mm) Root diameter d (mm) Fin height h (mm) Fin thickness s (mm) Fin pitch t (mm) Tube wall thickness (mm) Heat dissipation area sw (m2/m) Finning ratio a (sw/sn) - Quantity (kg/m) Operating temperature (℃)

Standard classification of finned tube materials:

1. Rao fin tube

The wound finned tubes are all made of (steel, aluminum, copper, stainless steel, etc.) strip wound tubes, which are mechanically wound to form a spiral shape with three different pitches: 3.2mm "R", 4.2mm "M", and 6.5mm "T". R spacing, with small spacing and large heat dissipation area, has a large heat dissipation capacity; M spacing, with a larger spacing, resulting in lower heat dissipation and air resistance; T spacing is suitable for situations with high steam pressure and low air temperature rise.

2. Squeezed (rolled) finned tubes (basically using this form -)

The fins of the rolled finned tube are smooth, prickly, wrinkled, beautiful, bright, and easy to clean. When used as components of air heaters and surface coolers, it is easy to remove surface condensation water, and is not easy to form dust and scale in drying, heating, and other occasions. The fins of the rolled finned tube are transverse and trapezoidal, resulting in high strength of the fins and expanding the heat dissipation surface, thereby maximizing the utilization of materials.

Single metal rolled finned tubes are made by rolling aluminum tubes as a whole, which have contact resistance, thermal shock and mechanical vibration, thermal expansion and energy, and have a considerable expanded heat transfer surface. Various types of heat exchangers and heaters made of this type of finned tube are obviously different from radiators made of series, wound, and cast iron. The bimetallic aluminum rolled finned tube is a type of finned tube that is tightly wrapped on the base tube, and then undergoes rough rolling, rolling and other processes on the aluminum tube to finally roll out a high-quality finned tube. The bimetallic aluminum rolled finned tube used for air cooler tube exchange has good heat transfer energy, and the finned tube tube and base tube do not undergo electrochemical corrosion during use. Compared with ordinary wound finned tubes, the contact thermal resistance remains stable over a large range with temperature changes, Therefore, the heat transfer and energy of bimetallic aluminum rolled finned tubes are more stable than those of wound tubes within the temperature range of the tube wall. In addition, compared with the wound tube, the bimetallic aluminum rolled tube has excellent corrosion resistance and high strength. It can withstand water pressure cleaning of 4.0 MPa, and the fins will not collapse. The base tube of the bimetallic aluminum rolled tube can be selected based on the corrosion of the fluid inside the tube and the processing technology. The base tube can be made of carbon steel, purple copper, stainless steel tube, etc.

3. String finned tube

String finned tube refers to a TLS type high heat exchanger (commonly known as a surface cooler) that connects (carbon steel, copper, stainless steel) tubes with (aluminum, copper, stainless steel) fins. The finned tube used for air cooler tube replacement adopts a mechanical expansion tube and a bridge type double flipped aluminum rib structure. The mechanical expansion tube makes the copper tube and aluminum ribs in close contact, and the bridge type slot can promote fluid turbulence, damage the boundary layer, and improve the heat transfer coefficient- The inlet structure, combined with the waterway stroke, reasonable design of pipe spacing and fin spacing, enables the finned tubes used in the air cooler to have heat transfer energy, low air resistance, compact structure, and light weight. The finned tube used for air cooler tube replacement can be applied in engineering such as air conditioning, cooling, dehumidification, heating, etc. It is a supporting product of fan units and air handling units, and can also be connected to the air duct for cooling or heating purposes.

KL type air cooler - capable of:

The KL type air cooler produced by Lianyungang Lingdong has a bimetallic rolled sheet structure, with a bimetallic base tube made of copper and a fin tube made of aluminum. The use of bimetallic finned tubes has the advantages of cooling, low thermal resistance, anti vibration, and can control the temperature rise of the generator within 105 ° C. It is a high cooling equipment that uses circulating water from power plants as the cooling medium, and has been widely used in units below 50MW in recent years. Compared with the spring coil air cooler, the bimetallic copper and aluminum composite rolling coil air cooler has the following advantages: larger heat dissipation area (increased by 50%), higher cooling capacity (increased by 20%~30%), lower air resistance (decreased by 20%), and its performance remains basically unchanged with the increase of service life. Therefore, the bimetallic rolling coil air cooler is a substitute product for the spring coil air cooler.

Basic form of air cooler:

The basic forms of air coolers include: sleeve type, wound plate type, rolled plate type, welded plate type, elliptical tube type, inlaid plate type, turbulent flow type, spoke air cooler type, slotted corrugated form. The pipe box structure of air coolers mainly includes flange type, pipe plug type, and manifold type- General flange type is used for low pressure, pipe plug type and manifold type are used for high pressure.

Air cooler cleaning method:

The cleaning method for air coolers is due to the high content of calcium, magnesium ions, and acidic carbonates in the cooling water. When the cooling water flows through the metal surface, carbonate is generated. In addition, oxygen dissolved in cooling water can cause metal corrosion and form rust. Due to the generation of rust and scale, the heat transfer efficiency of the condenser decreases. In severe cases, cooling water must be sprayed outside the shell, and scaling can clog the pipes, rendering the heat exchange ineffective. The research data shows that scale deposits have a significant impact on heat transfer losses, and an increase in sediment can lead to an increase in energy costs. Even a thin layer of scale will increase the operating cost of the equipment scaling part by more than 40%. Maintaining a cooling channel free of mineral deposits can greatly improve efficiency, save energy, prolong equipment usage, and save production time and costs. For a long time, traditional cleaning methods such as mechanical methods (scraping, brushing), high-pressure water, and chemical cleaning (acid washing) have encountered many problems when cleaning equipment: they cannot remove deposits such as scale, acid can cause corrosion to the equipment, form holes, and residual acid can cause secondary corrosion or corrosion under the scale, ultimately leading to equipment replacement. In addition, there is cleaning waste liquid, which requires a large amount of funds for wastewater treatment.

Working principle of air cooler:

An air cooler is an equipment that uses ambient air as the cooling medium, sweeping the outside of a finned tube to cool or condense the high-temperature process fluid inside the tube, commonly known as an air cooler. Using air coolers instead of water coolers for medium condensation and cooling can not only save water but also reduce water pollution. In addition, it also has the advantages of low maintenance costs, safe and reliable operation, and long service life. In the heat exchange equipment of refineries and petrochemical plants, air coolers have become an indispensable type of equipment. Its application scope includes various different working conditions from tower oil gas condensation to gasoline and diesel cooling. Air coolers are also widely used in industries such as chemical industry, power, and metallurgy. Our air cooler here is mainly used for the purpose of power plant steam turbine generator units and electric motors - closed circuit circulation ventilation cooling. The air cooler can cool the medium (water, steam) after heat absorption, so as to facilitate the circulation of the medium.

Air cooler technology -:

An air cooler is a device where the fluid inside and outside the tube undergoes heat and mass exchange through the base tube wall and rolled sheets to achieve the purpose of cooling the liquid. It mainly consists of six parts: water chamber, bearing plate, cooling pipe, wall panel, pipe clamp, and rear water chamber. Different materials can be selected for cooling pipes according to different cooling media. Therefore, when replacing the cooling tubes of the air cooler, it is important to pay attention to using copper tubes, stainless steel tubes, aluminum tubes, etc. In terms of form selection, it is also important to choose from: Rao finned tube, Squeezed (rolled) finned tube, and Tandem finned tube. The form and material are different - there are significant differences in the grid.

Instructions for ordering air coolers:

When ordering an air cooler, the user should provide the following parameters:

1. Total heat exchange capacity. 2. Single machine external dimensions. 3. Number of constituent units. 4. Air flow rate. 5. Inlet water temperature. 6. Air inlet temperature. 7. Air outlet temperature. 8. High work pressure.

The following parameters must be provided for the replacement of finned tubes in the ordered air cooler:

1. Drawing of the original air cooler equipment.

2. Inform the air cooler of the form of pipe replacement: Rao finned tube, Squeezed (rolled) finned tube, String finned tube

3. Material: Copper pipe, carbon steel pipe, stainless steel pipe, etc.

3. If there is no drawing of the original air cooler, it is necessary to provide the dimensions of the finned tube: tube length? Diameter? Wall thickness? What is the size from the fins to the outer wall of the base tube? Does a single device require fewer pipes?

4. What is the length, width, and height of the original equipment?

5. Air cooler tube replacement with finned tubes - old equipment must be shipped to our company for replacement?

The air cooler adopts finned tube parameters for tube replacement: copper aluminum composite finned tube specifications - energy table (note: 0. The base tube is brass tube, and the fins are aluminum rolled sheets. 1. The base tube is copper tube, and the fins are aluminum rolled sheets. 2. The base tube is copper tube, and the fins are copper rolled sheets. 3. The base tube is stainless steel tube, and the fins are aluminum rolled sheets. 4. The base tube is carbon steel tube, and the fins are aluminum rolled sheets.)

Technical parameters for air cooler tube replacement:

空氣冷卻器換管采用翅片管技術參數表（2）

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