In the conventional boiler, the exhaust gas temperature is generally 160 to 250 ° C, and the water vapor in the flue gas is still in a superheated state, and it is impossible to condense into liquid water to release the latent heat of vaporization. It is well known that the boiler thermal efficiency is calculated based on the low calorific value of the fuel, and the heat loss of the latent heat of vaporization in the high calorific value of the fuel is not considered. Therefore, the thermal efficiency of traditional boilers can only reach 87% to 91%. The condensing boiler, which reduces the exhaust gas temperature to 50 to 70 ° C, fully recovers the sensible heat in the flue gas and the latent heat of condensation of the water vapor. The volumetric component of water vapor in flue gas of condensing boilers with natural gas as fuel is generally 15% to 19%, and the content of water vapor in flue gas of oil-fired boilers is 10% to 12%, which is much higher than that of flue gas generated by coal-fired boilers. Water vapor content below %. At present, the boiler thermal efficiency is calculated by the low calorific value. Although the nominal thermal efficiency is higher, the actual energy utilization rate needs to be improved due to the difference between the high and low calorific value of natural gas is about 10%. In order to make full use of energy, reduce the exhaust gas temperature, and recover the physical heat energy of the flue gas, when the wall temperature of the heat exchanger is lower than the dew point temperature of the flue gas, the water vapor in the flue gas will be condensed, releasing latent heat, 10% high and low The difference in heat can be effectively utilized.
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