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The type of seal used in the air preheater is critical

Release time:

Jul 04,2023

As a kind of preheating equipment, the sealing form of air preheater is very important, it will directly determine its operation effect. In order to better adapt to different working conditions, the sealing form has been changed from traditional contact type to brush seal. How can this technology be used to play a good role?

As a kind of preheating equipment, the sealing form of air preheater is very important, it will directly determine its operation effect. In order to better adapt to different working conditions, the sealing form has been changed from traditional contact type to brush seal. How can this technology be used to play a good role?

As a new type of sealing technology that can reduce gas leakage, brush seal has been widely used in air preheater. Compared with traditional contact seal, it is easy to adapt to the irregular linear change of sealing gap caused by mushroom-shaped thermal deformation, manufacturing error, drum shaking, swing and vibration, and give full play to its good deformation compensation ability.

Through practice, the leakage characteristics of the brush seal are closely related to the pressure difference of the air preheater, the thickness of the brush bundle and the original smooth seal gap; and even the service life of the sealing brush depends on the length and diameter of the brush., Inclination angle, etc. Therefore, in actual engineering, considering the serious erosion of small solid particles or dust in the preheater and the problem of leakage point corrosion at the cold end, the diameter of the brush wire cannot be infinitely fine, and it is appropriate to take 0.10~0.15mm. In addition, the greater the inclination angle of the brush wire, the need to increase the brush wire in order to achieve the same sealing effect, generally 55 ° ~ 65 ° is appropriate.

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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.