Key points for installing welded finned tubes

2025-07-17

The installation of welded finned tubes must strictly follow the process specifications to ensure heat exchange efficiency and equipment safety. The core points are as follows: 1、 Pre installation inspection 1. Quality acceptance Check the appearance of the finned tube for deformation, ensure that the fins are not loose or detached, and ensure that there are no pores or cracks in the welds. If necessary, perform radiographic testing. Check whether the material certificates (such as 316L stainless steel and galvanized layer thickness of carbon steel) meet the corrosion resistance requirements of the working medium. 2. Environment and tool preparation The installation environment should be dry and ventilated, avoiding corrosive gases; Tools include level gauges, torque wrenches, and specialized lifting equipment. 2、 Installation process control 1. Positioning and fixation Levelness control: During installation, calibrate with a spirit level with a deviation of ≤ 2mm/m to avoid uneven flow of heat medium causing local overheating. Support bearing capacity: The support spacing is ≤ 1.5m, and it needs to withstand 1.5 times the operating weight load. Large pipe groups need to be equipped with anti sway supports. 2. Pipeline system integration Reduce the number of right angled bends in t...

Application of serrated finned tubes

2025-07-17

1、 Industrial thermal management system 1. Petrochemical and Energy Sector Petroleum refining: used as a heat exchanger in atmospheric and vacuum distillation, catalytic cracking and other units to process high-temperature oil and gas (300-600 ℃), with a corrosion-resistant design that can resist sulfide corrosion. Power plant waste heat recovery: The waste heat of flue gas is recovered in the tail flue of the boiler, and the toothed structure improves the heat transfer efficiency by more than 20%, reducing the exhaust gas temperature to below 150 ℃. Chemical reaction temperature control: Control the polymerization and synthesis reaction temperature, stainless steel material is resistant to acid and alkali corrosion, ensuring continuous production safety. 2. Metallurgy and Manufacturing Industry Continuous casting cooling system: Spray cooling is applied to high-temperature steel billets, and serrated fins enhance water flow disturbance, resulting in a 30% increase in cooling efficiency compared to ordinary finned tubes. Industrial kiln waste heat utilization: Recovering furnace exhaust gas heat to preheat combustion air, with an annual energy saving rate of up to 15% -25%. 2、 Refrigeration and air conditioning system 1. Large scale refrigeration equipment Central air conditioning condense...

On which side should the fins of a finned tube heat exchanger be installed

2025-07-17

In the design of finned tube heat exchangers, the installation position of the fins directly affects the heat transfer efficiency, and the fins should be installed on the side with a smaller convective heat transfer coefficient (α). The thermal resistance on this side is relatively high, and increasing the surface area of the fins can significantly reduce the overall thermal resistance and balance the difference in heat transfer capacity on both sides; On the contrary, the side with a larger alpha has lower thermal resistance, and the effect of adding fins is limited. Example: Boiler economizer: The flue gas side alpha (about 50 W/(m ² · K)) is much smaller than the water side alpha (>5000 W/(m ² · K)), and fins need to be added to the flue gas side. Air cooler: The air side alpha (about 100 W/(m ² · K)) is lower than the liquid alpha inside the tube (>1000 W/(m ² · K)), and the fins should be placed on the air side....