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Factors of selecting finned tube for steam radiator

Release time:

Jul 04,2023

As the name implies, the steam radiator is a fin heat exchanger that uses steam for heat exchange. Its basic structure is composed of steel frame and heat dissipation tube, the core part of the heat transfer is finned tube.

As the name implies, the steam radiator is a fin heat exchanger that uses steam for heat exchange. Its basic structure is composed of steel frame and heat dissipation tube, the core part of the heat transfer is finned tube.

Generally, there are many processing methods for finned tubes, including brazing, inlay, winding, rolling and sleeve. There are many types and applications are also different. There are many small categories in each processing method, such as winding, which is divided into L/LL. The difference between them is that the latter circle of fins presses the former one or the former two fins. As for how to choose fins, please listen to the detailed decomposition below.

When the fins are "rooted" on the surface of the light tube, in the case of heat transfer from the inside of the tube to the outside of the tube, the heat will be transferred from the root of the fin to the outside along the height of the fin, and at the same time it will be continuously transferred to the surrounding fluid in the form of convective heat transfer. As a result, the temperature of the fin will gradually decrease along the height direction.

The temperature of the steam radiator fin gradually decreases along the height direction, indicating that the difference between the fin temperature and the surrounding fluid temperature is gradually shrinking, and the heat exchange per unit area is gradually shrinking. Thus, the effectiveness of the fin surface area to enhance heat exchange is reduced. The higher the fin, the smaller the "contribution" of its increased area to heat exchange.

For high frequency welding finned tubes commonly used in engineering, when the fin height is 15mm, the fin efficiency is about 0.8, while when the fin height is 20mm, the fin efficiency is reduced to about 0.7. This shows that it is appropriate to choose a fin height of 15mm. If a fin height of more than 20mm is selected, special care should be taken because the fin efficiency is too low and is generally not used. For the aluminum fins used in the air cooler, because the thermal conductivity of aluminum is much higher than that of carbon steel, the fin efficiency is higher, and it is acceptable to increase the fin height to 22-25mm.

Factors of selecting finned tube for steam radiator

Selecting a small pitch can effectively increase the fin ratio. Care should also be taken when choosing the pitch. The factors that should be considered are: the nature of the flow gas and the possibility of ash accumulation. Can be divided into three situations:

A case of ash particularly serious occasions, such as: iron and steel plant electric furnace, converter, and some industrial furnace exhaust, ash content is very large, if the fin tube heat exchange, must choose a large fin pitch. For example, the pitch is more than 10mm, which should be supplemented by reasonable ash discharge design and selection of soot blower.

The second case is that ash deposition is not necessarily serious, but it should also be paid attention to. For example, for the exhaust gas of power station boilers and industrial boilers, it is more appropriate to use about 8mm fin pitch, but it should be supplemented by a design scheme with self-blowing ability.

The three cases are occasions where there is no or slight ash accumulation, such as the exhaust of natural gas burning equipment, or air cooler, and the fin pitch of 4-6mm is possible. For aluminum air coolers, the fin pitch is often about 3mm. The selection of fin thickness mainly considers the corrosion and abrasion of the gas flowing around. For corrosion and wear serious occasions, can choose thicker fins.

Focus on hot spots

Characteristics and application fields of high frequency welding finned tube radiator

The base tube and the fin are firmly welded, the contact thermal resistance is small, the sheet distance is uniform, the wrinkle is small, it is not easy to accumulate dust, and the heat exchange efficiency is greatly improved. It is widely used in the waste heat recovery of heating furnaces, boilers, kilns, hot air furnaces and drying towers. Compared with traditional wound-tube air coolers, the outstanding advantages of high-frequency welded finned tube radiators are large heat dissipation area and cooling capacity. High, low air resistance, and its performance remains basically unchanged with the increase of service life.

How to buy SRZ finned tube radiator

The base tube of the traditional SRZ finned tube radiator is generally Φ 21*2 stainless steel or carbon steel tube, the height of the strip steel used for winding the sheet is 15mm, and the sheet distance is 5-8mm. The thickness of the sheet is generally 0.23-0.38mm.

Advantages of spiral high frequency welding finned tube

As a commonly used heat exchange element, high frequency welding finned tube needs to work for a long time under high temperature flue gas environment. For example, finned tubes used in boiler heat exchangers are used in harsh environments, high temperature and pressure, and corrosive environments. High-frequency welded finned tubes should have high-performance indicators, mainly including: corrosion resistance, wear resistance, low contact thermal resistance, high stability and anti-fouling ability.

Advantages of finned tube radiators

The finned tube radiator is not easy to ash. The cause of dust accumulation is the Karman vortex gap. Ash deposition will affect the flow of steam in the pipeline, and then affect the heat transfer efficiency of steam. After hot-dip galvanizing, the gap of the heat pipe is reduced, and it is not easy to form a dust accumulation angle, which affects the heat transfer efficiency. The integral finned tube radiator has stable performance and long service life. The thermal test has stable heat transfer performance and is suitable for various drying chambers and large and medium heating systems. The heat transfer efficiency is high, the corrosion resistance of the entire hot-dip galvanized layer is improved, and the service life is extended.

How to choose the material of finned tube radiator

The choice of finned tube radiator material determines the life of the heat exchanger and the cost of the equipment. When we choose the material according to the working conditions, we can choose the radiator with high cost performance, thereby reducing the production cost of the enterprise.