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The heat exchanger unit is mainly used to recover the heat energy in the high-temperature exhaust gas discharged during the drying process in the utilization of waste heat from drying exhaust gas, improve energy utilization efficiency and reduce energy consumption. The following are its application methods and related points:
1. Application Scenario
Heat exchangers are often used to recover waste heat from exhaust gases emitted by drying equipment (such as textile, food, wood, ceramics and other industries). These exhaust gases usually have high temperatures (50℃-200℃ or higher) and humidity, and contain a large amount of recoverable heat energy. Through the heat exchanger, the heat in the exhaust gas is transferred to fresh air, process water or other media for preheating air, heating drying media or heating, thereby reducing energy waste.
2. Working principle of heat exchanger
- Air-to-air heat exchange：The exhaust gas and the cold air entering the drying system exchange heat through a heat exchange core (such as a plate or heat pipe heat exchanger). The cold air is preheated and enters the drying system, reducing heating energy consumption.
- Gas-Liquid Heat Exchange：The heat in the exhaust gas is transferred to a liquid medium (such as water) to produce hot water or steam for heating or other process needs.
- Heat recovery：The heat exchanger unit recovers the sensible heat and latent heat (heat released by condensation of water vapor) of high-temperature exhaust gas through heat-conducting materials (such as aluminum foil and stainless steel) to avoid direct heat discharge.
3. Actual Cases
- Textile drying：The hot and humid exhaust gas from the textile dryer is recycled through the heat exchanger unit to preheat the dry air, improve the drying efficiency and reduce energy consumption.
- Food drying: In the food heat pump drying system, the heat exchanger unit recovers the waste gas heat and uses it to heat fresh air or generate hot water, with significant energy-saving effects.
- Industrial boilers：The waste heat from drying exhaust gas is used to preheat boiler inlet water or air through a heat exchanger to improve boiler thermal efficiency.
4. Challenges and Solutions
- Exhaust gas fluctuations：The drying process may cause unstable exhaust gas temperature and flow, so it is necessary to design a heat exchanger with a wide operating range or install a buffer device.
- Corrosion and dust accumulation: Use corrosion-resistant materials and regularly clean and maintain, and install filters when necessary.
- Initial investment: The initial cost of the heat exchanger unit is high, but the investment can be recovered within 1-3 years through energy-saving benefits.
Heat exchanger units are an efficient and environmentally friendly solution for the utilization of waste heat from drying exhaust gas, and are suitable for a variety of industrial drying scenarios. Through reasonable selection, design and maintenance, energy utilization can be significantly improved, operating costs can be reduced, and energy conservation and emission reduction can be achieved.
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