Food factory waste heat recovery boiler principle: the use of boiler flue gas temperature is high, serious shortcomings heat loss, energy-saving boiler flue gas heat recovery equipment, can produce hot water, hot air or steam as needed. Characteristics of heat pipe heat absorbing efficiency is fast, is a heat transfer element having high conductivity properties, which closed vacuum envelope by the working fluid evaporation and condensation to transfer heat, with a high thermal conductivity, good isothermal, hot and cold sides of the heat transfer area can be arbitrarily changed, long-distance heat, temperature-controlled series of advantages. Features 1. Because the case of air / water heat exchangers, air-side using finned tubes, heat transfer area increases, higher heat transfer efficiency 2. the flue gas heat exchanger tube is conducive to ash and Maintenance 3. Each heat pipe heat transfer components are independent, easy removal and allow free expansion The wall temperature can be adjusted by design, help to avoid dew point corrosion, so that longer life 5. The heat pipe device placed vertically to take the form of smoke and Reverse horizontal flow of water to form an air / water heat exchanger, flue gas heat exchangers to maximize efficiency