How to fully utilize the waste heat recovery effect of tubular coolers?
Release Time:
2025-08-31
The shell-and-tube cooler, also known as a shell-and-tube heat exchanger, is divided into tube side and shell side. The path of the liquid flowing inside the tubes is the tube side, while the path of the liquid flowing outside the tubes is the shell side. The tube bundle wall surface serves as the heat transfer surface. When the temperature difference between the tube bundle and the shell exceeds 50°C, equivalent temperature compensation measures are taken to eliminate or reduce thermal stress.
It is usually water-cooled and dominates the market. So how can the waste heat recovery effect of the tubular cooler be fully utilized?
Waste heat recovery is carried out using a shell-and-tube cooler. Waste heat recovery equipment plays a subordinate or auxiliary role in the operation system relative to the main equipment. Strictly speaking, ensuring the safe and economical operation of both the main equipment and the waste heat recovery equipment itself is very important. When selecting a preheating method, the advantages and disadvantages of this method must be compared, and the economic feasibility of using this preheating method under specific furnace conditions must be analyzed.
During the design planning, the preheating method is first determined through process analysis, and then the shell-and-tube cooler is selected. This is illustrated by the example of selecting the preheating method for blast furnace hot blast stove combustion air and gas.
It is well known that increasing the blast furnace air temperature is an important measure to reduce the coke ratio in the blast furnace, but the blast furnace air temperature in existing enterprises in our country has remained around 1000°C, which is higher than that abroad.
It is about 200 degrees lower than foreign temperatures, so preheating low-calorific value gas and combustion-supporting air theoretically raises the combustion temperature, meaning the gas temperature and air temperature are suitable.
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