Air cooling device: types and description

The air cooling unit is designed to lower the temperature of gases or various liquids. These devices are mainly used in technological processes. However, in industry they can also be found. When using a cooling device, much depends on the pressure of the medium. The maximum threshold is 16 MPa on average. In some cases, the devices are used in a vacuum. The residual pressure must be at least 650 Pa. The permissible temperature depends on the type of cooling unit.

What types are there?

By design, the cooling apparatus is divided into horizontal and vertical. Still there are zigzag patterns. They can be installed with one or two fans. To cool viscous substances, there is a separate type, which is divided into subspecies (low flow, as well as block-modular). For compressors, cooling devices are distinguished from the recirculation system and without it.

Cooling equipment "AVG"

The air cooling unit "AVG" is used to condense and lower the temperature of vapor and liquid substances. It is used most often in the petrochemical industry. The design of this device is quite simple. It consists of an electric motor and pipe sections. In addition, there is a drive for the fan.

To adjust the flow of air there are blinds. In some models, the flaps rotate automatically. There are 3 sections in the unit. The diameter of the fan wheel is within 3 m. The electric motor's power is 37 kW. In some models this parameter equals 30 kW. The speed of rotation of the fan wheel is quite large. With a power of 37 kW, more than 300 rpm are performed. Coefficient of finning of pipes is 20. In one section there can be from 4 to 8 rows of pipes. As a rule, they are installed in the lid type. The average length of the pipe in the section is 4 m.

What is the difference between viscous products?

In these devices, special bimetallic pipes are used. At the same time, the viscosity of the substance should not exceed 10 m ² / s. These devices are most suitable for oil refineries. The coefficient of fins is low. There is only one fan installed on this air-cooling unit.

The diameter of the supporting pipe is 38 mm. The sections are mounted in a special way. This is necessary in order for the fan drive to be in a separate frame. Its wheel rotates in the cavity of the collector. As a result, air passes between the pipes. The scope of this cooling device depends on the manufacturer. If necessary, a humidifier can be attached to the device.

Blinds, as a rule, work automatically. However, the manual butterfly valve is provided by the manufacturer. If we talk about the characteristics, then the pressure of the device is kept at the level of 37 MPa. There are three sections. The diameter of the fan is 2.8 m. The electric motor's power ranges from 20 to 35 kW. The average rotation speed of the wheel is 400 rpm. Coefficient of pipe finning 7.8. In one section there can be up to eight pipes. The case is made of steel grade "B2". The sections are installed in the lid type. Pipes come in 4, and also 8 m.

Description of devices of zigzag type "AVZ"

The air-cooling unit "AVZ" is of a zig-zag type suitable for cooling gaseous substances. Such devices are used only in the petrochemical industry. The difference is in the presence of six sections. They are made of bimetallic pipes. As the name implies, they have the form of a zigzag. The angle is quite sharp. To fix the sections, special horizontal stops are provided.

The lower platform is quite strong. The fan drive is mounted on a separate frame. The device wheel rotates in the manifold. In some cases such devices can be equipped with a recirculation system. In this case, the blinds are located in the upper, as well as in the side parts of the device. In this case, supercooling of the substance is prevented. This is especially true in the winter season. Direct fans can also be installed differently. Some manufacturers produce them from composite materials. In this case, they are more durable.

The heat exchange area is 2650 by 8480 square meters. M. The pressure is kept at the level of 5 MPa. The fan is installed at a diameter of 5 m. The electric motor's power varies from 30 to 70 kW. In total, one wheel is provided in the design. Its average speed is 200 rpm. On the average, the section consists of four pipes. Blinds withstand pressure only up to 0.6 MPa. The length of the pipes is 4 m.

Apparatus with two fans

Such types of air cooling devices are used, as a rule, in related industries. At the same time, they are good at condensing vaporous substances. It is also possible to cool the liquid in the apparatus. In total there are six pipe sections. They are located on the frame in the form of a zigzag. The pipes are mainly installed in bimetallic. The horizontal supports in this cooling unit are provided. The drive with the wheel is mounted on the frame. The fan wheel is located in the collector cavity.

The humidifier is usually included in the kit. The calculation of the air cooling device is based on the density index. Blinds with manual adjustment are provided. There are panels with barriers on the side sections. They are located at the bottom of the device. Electric motors mainly have a speed converter. All this allows you to reduce the power consumption of the device. The pneumatic line is adjusted automatically. At the same time, the angle of the blades varies rather smoothly. The fans are simple to maintain. According to the characteristics of cooling devices with two fans are not too different from other types.

The average length of the pipe is 4 m. At the same time, the sections are installed in the lid type. The fin fineness coefficient ranges from 9 to 20. The fan wheels rotate at a maximum speed of 400 rpm. At the same time, the electric motor's power is 37 kW. The diameter of the wheel is 2.8 m. The working pressure is at 6 MPa. The area of heat exchange is 3450 per 11 400 square meters. M.

Low flow type of devices "AVM"

"AVM" air cooling units are used for cooling liquids. They are in demand most of all at various industrial enterprises. The structures they have can be either horizontal or vertical. Thus the section in the device is provided one. It consists of finned pipes. The fan is axial type. He pushes the air pretty fast. The flow passes along the pipes.

Electric motors for these models are used special. They differ from other devices by explosion protection. Blinds in the apparatus can be manual or automatic. An air heater is also provided. The recirculation chamber is also present. The supporting structure of the cooling device is very strong. It can withstand seismicity up to nine points.

Characteristics of the "AVM"

The surface area of the heat exchange is 105 x 375 sq. M. M. At the same time, the pressure is maintained at a maximum of 4 MPa. The electric motor is 3 kW. The fan wheel makes an average of about 1500 rpm. The length of one heat exchange pipe is 1.5 m. In total there are 8 rows in the section. Coefficient of finning is at level 20. Frames are made of steel grade "B1" or "B2". This air-cooling apparatus weighs 4200 kg.

Block-modular cooling unit "ABO"

Air-cooling device "ABO" is used in technological processes for the condensation of gaseous substances. Apply it in the oil refining and petrochemical industry. The models have a horizontal design. Due to this, the fans are installed in the lower part. In addition there is a special box on the frame. It is necessary for air injection.

In the sections, rolling mills are used. Venetian blinds are installed for air recirculation. Also there are heaters that will not allow the substance to overcool. In winter, this problem is particularly relevant. Modifications of this type of apparatus are many. The average area of heat-exchanging pipes is 595 by 1565 square meters. At the same time, the maximum output of devices is 1795 to 4735 square meters. The diameter of the fan wheel is 1.6 m.

There is one section in the device. The power of the slow-moving electric motor can reach 15 kW. The number of wheels in the device depends on the modification. On the average there are 6 pipes on the section. The fan wheel makes more than 700 revolutions per minute. The length of the section can reach 12 m. The heat exchanger air-cooling unit "ABO" has only a chamber type.

Description of devices with recirculation

These devices are used to reduce the temperature of sulfur-containing gases. In this case they are equipped with input and output collectors. The most common devices for air cooling of gas can be found at booster compressor stations. They are also actively used on main gas pipelines. They are single and dockable.

In the first variant the device works independently. The interlocking devices are typically connected in series to increase power. The sections in them are set horizontally. They consist of bimetallic pipes. At the same time, the air is pumped by a fan. It is installed, as a rule, of the axial type. There is a fan in the bottom of the cooling unit, on the frame. Next to it there is a slow-moving electric motor.

In conditions of cold climate, the air cooling devices of the gas feel excellent. Fan wheels are usually made of composite materials. The speed converter is provided. At the same time, the electricity consumption is rather moderate. All this speaks for the economy of this type of device. The angle of the blades can be adjusted manually. In general, fans in service are very simple. A trolley may be supplied with the device. It is necessary to remove the motor. In this case, you can also repair the wheel with it.

What are the characteristics of the devices with recirculation?

The heat exchange area is 9930 square meters. The design pressure is 7.5 MPa. The calculation of the air cooling device is made based on the pressure index. In total there are 3 sections in the apparatus. The diameter of the fan wheel is exactly 5 m. The power of the electric motor is 37 kW. The average speed of rotation reaches 250 rpm. Coefficient of finning of pipes is 20. Welded chamber is installed in class CT20. There are 6 pipes in the section. The collector and plugs in the cooling unit are made of steel.

Devices with a hood

This air cooling unit is used to condense water vapor. As a rule, it is an integral part of the turbine unit. It accommodates 6 fans of the axial type. Water vapor enters the collector directly through the pipes. In a special chamber, it condenses.

Removal of steam is by means of a fitting. All residues fall into the upper section. In it, the condensation process is completed. Sometimes sections can freeze. To avoid such problems, the devices have blinds. They are located on all sides. Manually adjust the flaps, of course, you can. In general, the device is not simple and quite difficult to maintain.