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The working principle of the cigarette lighter.
Release time:
2025/11/29
The economizer is a heat-exchange device located in the flue gas duct at the rear of the boiler. It utilizes the waste heat from flue gases at temperatures ranging from 400 to 600°C to preheat high-pressure feedwater, bringing its temperature close to the saturation state corresponding to the drum pressure. Its core functions include:
Energy saving: For every 1℃ increase in feedwater temperature, flue gas temperature can be reduced by 2-3℃, boosting boiler efficiency by 5-15%.
Protect equipment: Reduce the temperature difference between feedwater and the steam drum, thereby lowering thermal stress.
Economic benefits: Replacing part of the evaporative heating surface with an economizer reduces the boiler’s construction cost.
Workflow
High-temperature flue gas flows through the rear flue duct and exchanges heat with the economizer tube bundle.
The high-pressure feedwater absorbs heat inside the pipe, causing its temperature to rise from approximately 150℃ to near the saturation temperature (e.g., 300℃).
The heated water enters the steam drum, reducing the heat transfer surface load for evaporation.
Special protection mechanism
During boiler startup, a natural circulation is established via the recirculation pipe: The heated water rises to the steam drum, while cold water flows back through the recirculation pipe, preventing the economizer from overheating and getting damaged. This device automatically activates when the boiler load drops below 20%.
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Address: No. 88-1, Jianghua Fuzhi Road, Hongqiao Town, Taixing City, Taizhou City, Jiangsu Province, China.
Tel: 86-13961791661 (Bao Zhenyu)
Email: 1102514@qq.com
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