Application of Finned Tube Heat Exchanger in High Temperature Flue Gas Waste Heat Recovery

Application of Finned Tube Heat Exchanger in High Temperature Flue Gas Waste Heat Recovery

Finned tube heat exchanger in the metallurgical industry in the high temperature flue gas waste heat recovery applications

Production processes in the metallurgical industry, such as ironmaking, steelmaking and steel rolling, produce a large amount of high temperature flue gas. These flue gases contain a large amount of heat energy, and if they are directly discharged, they not only waste valuable energy, but also cause thermal pollution to the environment. Finned tube heat exchangers are widely used to recover heat from these high-temperature flue gases and use it for other processes or district heating needs, thus improving energy efficiency and reducing environmental pollution.

Working Principle

The finned tube heat exchanger uses fins to increase the heat transfer surface area and improve heat transfer efficiency. When the flue gas passes through the finned tube heat exchanger, its heat is transferred through the fins and tube walls to the cooling medium (e.g., air or water) flowing through the tubes, causing the temperature of the flue gas to decrease and the temperature of the cooling medium to increase. This heat recovery process allows the recovered heat to be used for multiple purposes.

Specific applications

1. Blast furnace hot blast furnace

During blast furnace production, the hot blast furnace needs to preheat the cold air to a high temperature before feeding it into the blast furnace in order to increase the thermal efficiency of the blast furnace. Using finned tube heat exchanger, heat can be recovered from high temperature flue gas and used to preheat the air fed into the blast furnace, thus reducing fuel consumption and production cost.

2. Steam boiler preheating

The recovered heat can be used to heat the boiler feed water. Preheating cold water and feeding it into the steam boiler can improve boiler efficiency, reduce fuel consumption and increase steam production.

3. Process heating

Certain processes in metallurgical production require heating of specific materials or equipment. The heat recovered through the finned tube heat exchanger can be used for these heating needs, such as the preheating process in the steel rolling process, reducing direct fuel use and improving process energy efficiency.

4. Production Plant Heating

During the cold season, the production plant needs to be heated to provide a suitable working environment. The heat recovered from the finned tube heat exchanger can be used in the production plant heating system, reducing reliance on traditional heating energy and lowering operating costs.

5. Waste water treatment preheating

Metallurgical companies usually produce a large amount of industrial wastewater, which also needs to be heated during the wastewater treatment process. The heat recovered through the finned tube heat exchanger can be used to preheat this wastewater, improving the treatment effect and reducing the treatment energy consumption.

Economic and Environmental Benefits

Energy saving: by recovering the heat in the high temperature flue gas, it can significantly reduce fuel consumption, improve the efficiency of energy use and reduce production costs.

Environmental protection benefit: Reducing direct emission of high temperature flue gas reduces environmental heat pollution, and at the same time reduces greenhouse gas emission, which is in line with environmental protection requirements.

Equipment protection: Reducing the temperature of flue gas before discharging helps to reduce the thermal stress and corrosion of the discharge system and equipment, and prolongs the service life of the equipment.