Winery boiler flue gas heat recovery equipment principle: heat pipe is sealed vacuum envelope through the working medium latent heat to transfer heat, ie vacuum envelope of the working medium, the vaporization temperature is relatively low, medium absorb a lot at the time of vaporization heat, the heat value is several times the heat medium liquid saturation, the heat is latent heat. Such as: water at an absolute pressure of 0.001Mpa (equivalent to 0.098 kg / cm 2) Enthalpy enthalpy (heat) 29.54KJ / kg when saturated at 6.983 ℃ temperature and the latent heat of water is 2514.4KJ / kg, i.e. water in this under two conditions necessary to absorb into steam is itself temperature (ie 6.983 ℃) heat (enthalpy 29.54KJ / kg) 85 times (2514.4KJ / kg) heat pipe medium from liquid phase to a vapor state need to absorb a lot of heat, so heat efficiency of heat pipe heat absorption is very high, the water section of the heat pipe heat dip air bag, which emit a lot of heat is absorbed by the air bag in the water, the heat pipe in the media by the vapor condensation into small droplets, while the release of latent heat, and so forth constantly circulating the flue gas heat to the air bag in the steam boiler flue gas heat through the heat pipe means producing low pressure steam, can complement the existing steam boiler gas production 10 % or more, if the existing boiler or industrial furnace oil furnace, steam generator for the user to open a free new steam generating power source or sources. When the flue gas temperature 280 ~ 300 ℃, steam pressure generated up to 6 ~ 7kg / cm2, steam boiler output of more than one tenth the amount of evaporation, energy-saving rate of more than 10%.