Design of heat pipe heat exchanger for recovering waste heat from a gas-fired boiler
Li, Rengao (2025)
Kandidaatintyö
2025
School of Energy Systems, Energiatekniikka
Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi-fe2025051946914
https://urn.fi/URN:NBN:fi-fe2025051946914
Tiivistelmä
Heat pipe heat exchanger is a type of exchanger that transfers heat through the phase change of the working fluid inside the heat pipe. It offers advantages such as a small temperature difference for heat transfer, simple structure, and high heat transfer capacity. This study focuses on a 116 MW gas-fired boiler and presents a complete and detailed design of a gravity-type gas-liquid heat pipe heat exchanger using conventional design methods.
Based on the calculations, 738 gravity-assisted heat pipes with a length of 4100 mm are selected. The tube bundle is arranged in 12 rows in a staggered configuration. Water is used as the working fluid, carbon steel as the tube material, and aluminum as the fin material. This combination provides benefits such as low cost and excellent thermal conductivity. The pressure drop on the flue gas side is approximately 841 Pa, which is within an acceptable range. The tube wall temperature is around 74 °C, which avoids dew point corrosion.
Under China’s strong push for energy conservation and emission reduction, this equipment provides a more efficient energy-saving solution at a lower cost.
Based on the calculations, 738 gravity-assisted heat pipes with a length of 4100 mm are selected. The tube bundle is arranged in 12 rows in a staggered configuration. Water is used as the working fluid, carbon steel as the tube material, and aluminum as the fin material. This combination provides benefits such as low cost and excellent thermal conductivity. The pressure drop on the flue gas side is approximately 841 Pa, which is within an acceptable range. The tube wall temperature is around 74 °C, which avoids dew point corrosion.
Under China’s strong push for energy conservation and emission reduction, this equipment provides a more efficient energy-saving solution at a lower cost.