Boiler flue gas heat recovery and measures of analysis in today's society, energy conservation has become after coal, electricity, oil and gas, "the fifth of energy." In use now in widespread industrial boilers heat utilization is low, high temperature waste heat emissions, and pollution of the environment within the flue gas content is too high and other issues. This paper will do in-depth analysis of these problems and propose some measures to solve the current problem at present, energy conservation is a long-term strategic plan for China's economic development, but also present an urgent task. Currently, the whole society in carrying out energy saving, ease pressure on energy and building energy-saving society, and recycling of industrial waste heat boiler is an important energy conservation measures, the share of industrial boiler flue gas heat recovery boiler heat a larger proportion. If you do not control the boiler flue gas heat, will bring great harm to the global environment and information. Analysis of boiler flue gas heat boilers are installed in a large cast iron or stainless steel tube economizer is used to preheat the combustion air or boiler feed water, but as oil, coal and natural gas fuels contain sulfur during combustion, sulfur oxides generation is essential, it combines with the water vapor formed after * steam. When the metal wall temperature is lower than the rear of the boiler heating surface * steam condensation point (called the acid dew point), it will form a liquid on its surface * (called condensation). For a long time, economizer and other objects due to corrosion caused by condensation, even perforation, this phenomenon occurs frequently, seriously affecting the safe operation of the boiler, so the current through the boiler exhaust gas temperature increase to alleviate condensation and corrosion phenomenon, resulting in the boiler flue gas temperature is high, resulting in a lot of heat into the atmosphere, waste resources and pollute the environment. According to the data indicate that the thermal efficiency of general industrial boilers is about 60 to 70 percent, it's probably in the exhaust gas temperature between 250 ℃ ~ 350 ℃, and thermal oil heaters, exhaust gas temperature is more than 280 ℃, a lot of heat is not fully utilized, if these fumes emitted directly into the air, which will not only lead to higher temperatures, pollution of the environment, but also an enormous waste of energy. Thus reducing the flue gas temperature has become an important way to saving boiler, the boiler must be solved at the same time low-temperature corrosion problems. However, when conducting flue gas heat recovery to achieve energy use, should pay attention to the following issues: the main part of the acid dew point corrosion in the boiler air preheater, further reduce exhaust gas temperature and improve thermal efficiency, from design, material selection terms of installation and operation to take measures to prevent and reduce the low dew point corrosion. ① slightly above the flue gas dew point temperature corrosion. General approach dew point corrosion is through careful design, the efficiency is reduced under limited circumstances, increase the heat transfer surface of the wall temperature, making it slightly higher than the dew point temperature of the flue gas, so that does not produce the dew point to prevent corrosion. ② selection of corrosion-resistant materials. For example, we can use the ND Steel (09CrCuSb), because it has a high resistance to low temperature corrosion, not only corrosion resistant * and negative chloride ions also has high corrosion resistance, and its mechanical properties of carbon Steel fairly. ③ adding heat exchanger. Waste heat recovery boiler flue gas before entering the main water film flue dust increases the cross-sectional area, and then add a group of heat exchangers. Is added to the exhaust flow rate will affect the boiler and smoke resistance while increasing the cross-sectional area of ??the flue is mainly to avoid the resistance after the heat exchanger is added in the flue formed. Through the use of heat pipe heat exchanger in the flue gas heat recovery unit capable of high-grade waste heat recovery can be increased by 8 to 10 percent of industrial furnace efficiency. It is the traditional industrial boilers emitted flue for increasing the temperature of the boiler water softener, or discharge of waste gas boiler, heating boiler combustion air to improve the supply air temperature, energy-saving, the use of the device with a boiler efficiency great theoretical and practical significance. Use heat pipe heat exchanger makes use of waste heat recovery boiler greatly improved utilization, it is through a combination of different forms, waste heat recovery boiler, for example: for preheating boiler combustion air (air pre-heater); Pre heat boiler feed water (economizer); the production of hot water (water heater); production of steam (HRSG). Heat pipe heat exchanger can be gas-fired boiler flue gas temperature is reduced to about 80 ℃, the diesel-fired boiler flue gas temperature is reduced to about 100 ℃, which is cast iron or stainless steel tube economizer or air preheater can not do.