Heat pipe air preheater

Heat pipe air preheaterUsing superconducting heat pipes as the core heat transfer element, high-temperature flue gas flushes the heat absorbing end of the heat pipe, causing the working fluid in the heat pipe to evaporate into gas and flow towards the cooling end, where it condenses and releases heat, heating the air. Hot air is supplied to the boiler through pipelines for air supply.

Advantages:

1. Adopting high-frequency welding fin tube technology, it uses high-frequency melting to weld fins and base tubes together to form metallurgical connections. The welding rate of the pipe segments is 100%, and the contact thermal resistance is close to zero. Sintering a dense and smooth alloy protective layer of about 0.05mm on the surface of the finned tube gives ordinary carbon steel materials the same performance as stainless steel. Its surface hardness is high, and it can work under high temperature, high flow rate, and corrosive media erosion. It is resistant to low-temperature acid dew point corrosion and has a lifespan that can be increased by 3 to 5 times compared to similar products. A smooth surface can slow down dust accumulation;

2. This device has low fluid resistance and high heat transfer efficiency;

3. The two fluids walk outside the tube, allowing the heat pipe to be fully finned and increasing the heat transfer area;

4. A spacer ring is used to separate the heat pipe from the tube sheet, allowing for unconstrained thermal expansion and contraction deformation of the heat pipe, thereby avoiding stress damage.

5. Single tube operation of heat pipes, single or partial heat pipe aging does not affect the normal operation of equipment.

6. Both fluids for heat exchange flow outside the tube and can be finned.

7. The equipment has low fluid resistance, high heat transfer efficiency, and compact structure.

8. Both cold and hot fluids flow outside the heat pipe, and both sides can be reinforced with fins, resulting in high heat transfer efficiency, compact volume, low pressure drop, and low resistance loss, thus saving the power consumption of the blower and induced draft fan.

9. The hot side (flue gas side) and cold side (air side) of the heat pipe are separated by a partition, and there is a reliable seal between the heat pipe and the partition. Therefore, the possibility of leakage between air and smoke is very small, which reduces the possibility of air leakage from the overall structure.

10. Heat transfer in a heat pipe relies on the phase change of the working fluid inside the pipe. The two ends of the heat pipe are sealed by end caps. When one side of the pipe wall of a heat pipe has a perforation, only a small amount of working fluid inside the pipe leaks out, but the cold and hot fluids do not collude, thus greatly reducing the possibility of air leakage.

11. By controlling the wall temperature of the flue gas end of the heat pipe heat exchanger, every point of each heat pipe in the heat exchanger can be above the dew point, effectively avoiding sulfuric acid dew point corrosion during coal combustion.

12. The material of the heat pipe is selected from high-temperature and high-pressure resistant boiler steel, with a service life of more than ten years; The working fluid inside the pipe is non-toxic, non corrosive, non flammable, and operates under negative pressure without any safety hazards.

13. Heat pipes can be made into any shape according to the installation environment, and the heat absorbing and releasing ends can be dispersed and arranged at long distances.