Simulation test and energy efficiency analysis of flue gas heat deep recovery of thermal power plants

According to the characteristics of gas combustion and exhaust smoke heat of the gas-fired thermal power plant, using the anti-corrosion type and efficient flue gas condensing heat recovery unit, rebuilds the gas boiler room for increasing the energy efficiency, establishes a simulation heating system utilizing exhaust smoke heat of plants and studies the energy saving and emission reduction potential of flue gas condensing heat recovery. Engineering measurement results indicate that, in the condition of smoke temperature is 55-103 ℃ and inlet water temperature of the gas condensing heat recovery unit is 19-32 ℃, the smoke temperature can be reduced to 30-39 ℃; the energy saving rate is 1.4%-3.2% for each 10 ℃ dropping of smoke temperature; meanwhile 0.7-1.2 tons of flue gas condensate water is produced for 1 t/h of boiler capacity per day for recycling use; and the pH value of flue gas condensate water is about 2.4, appearing strongly acidic, so it is very important to prevent equipment corrosion. Even if the temperature of power plant exhaust smoke is below 100 ℃, there still is a great potential for energy saving, water saving and emission reduction.