The boiler air preheater is a key component designed to raise the temperature of the air entering the boiler. This increases the boiler’s thermal efficiency. During operation, the air preheater recovers heat from the flue gas. It uses this heat to warm cold air before sending it into the combustion chamber. This leads to more complete fuel combustion and better boiler efficiency.
The specific functions of the boiler air preheater are as follows:
- Improving Boiler Thermal Efficiency
The air preheater raises the temperature of the air entering the boiler, increasing its heat capacity. This allows the air to carry more heat, leading to more efficient fuel combustion. As a result, the boiler absorbs more heat, improving its thermal efficiency. Installing an air preheater can boost a boiler’s thermal efficiency by 5% to 8%.
- Reducing Exhaust Temperature
The exhaust temperature directly affects boiler efficiency. High exhaust temperatures cause significant heat loss, reducing efficiency. The air preheater recovers heat from the flue gas and uses it to warm the incoming air, lowering the exhaust temperature. This reduces heat loss, improves efficiency, and decreases the boiler’s environmental impact.
- Reducing Fuel Consumption
The air preheater raises the air temperature, ensuring more complete fuel combustion. This reduces fuel consumption. It also shortens the time needed for boiler startup and shutdown, leading to further savings. Installing an air preheater is essential for energy conservation and cost reduction.
- Improving Combustion Conditions
The air preheater raises the air temperature entering the boiler, allowing more oxygen during combustion. This improves combustion efficiency and reduces harmful gas and smoke emissions, benefiting environmental protection.
- Enhancing Boiler Operating Stability
The air preheater stabilizes the combustion process, reducing fluctuations and improving operational stability. It also decreases slagging and ash buildup on heating surfaces, keeping them clean and boosting efficiency and reliability.
- Lowering the Exhaust Dew Point Temperature
The air preheater raises the air temperature while lowering the exhaust dew point temperature. The dew point is when water vapor in flue gas starts condensing. If the exhaust temperature falls below this, condensation and corrosion can occur. The air preheater prevents this by raising the exhaust temperature.
In summary
The boiler air preheater is crucial for improving thermal efficiency, lowering exhaust temperature, reducing fuel consumption, and enhancing combustion conditions. It also boosts operational stability and lowers the exhaust dew point temperature. Therefore, the selection and configuration of the air preheater should be carefully considered in boiler design and operation to optimize overall performance and economic efficiency. As technology advances and environmental standards tighten, air preheater technology continues to evolve, supporting efficient and eco-friendly boiler operations.
To address corrosion and high exhaust temperature in boiler air preheaters, Bokk Tech has designed innovative products. These include highly corrosion-resistant stainless steel and rare earth alloy tubes, along with elliptical tubes that boost heat exchange efficiency. These improvements ensure the air preheater works efficiently and reliably, achieving optimal boiler performance.
About Us
Shandong Bokk Tech is dedicated to solve the problem such as ash blockage, corrosion and excessive exhaust gas temperature in the tubular air preheater of small and medium-sized boilers. We primarily manufacture automatic cleaning devices for tubular air preheaters and corrosion-resistant heat pipes. Our products are widely used in the thermal power plants, chemical plants, new energy sector, etc.
We offer customized services to customers around the world, allowing us to adjust product dimensions and other specifications based on your specific needs, to improve air preheater heat efficiency.
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