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天然气等碳氢燃料燃烧后的烟气中含有大量水蒸气,将排烟温度降低到水蒸气冷凝温度以下可回收水蒸气的冷凝潜热,锅炉热效率按低位发热量计算可超过100%。热平衡计算结果显示可以用助燃空气回收烟气的冷凝潜热,但烟气进口温度有一个上限值。将蓄热式燃烧技术用于燃气锅炉,可将烟气温度降低到冷凝温度之下。换向周期越短热效率越高,换向周期20 s时热效率可达106.7%。通过空气分级燃烧可以使烟气中NOx排放水平降低到46 mg/m3(6%O2)左右的水平,且烟气冷凝液可吸附烟气中约14.3%的NOx。
Natural gas and other hydrocarbon fuels after burning the flue gas contains a lot of water vapor, the exhaust gas temperature will be reduced to below the condensing temperature of water vapor condensable latent heat of evaporation, the boiler thermal efficiency by low calorie can be calculated more than 100%. Heat balance calculation results show that it is possible to recover the latent heat of condensation of flue gas with combustion air, but the flue gas inlet temperature has an upper limit. Using regenerative combustion technology for gas boilers reduces the flue gas temperature below the condensing temperature. The shorter the commutation cycle, the higher the thermal efficiency, and the thermal efficiency can reach 106.7% at the commutation period of 20 s. Staged combustion by air can reduce the level of NOx emissions in flue gas to around 46 mg / m3 (6% O2), and flue gas condensate can adsorb about 14.3% of NOx in the flue gas.