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以天然气为燃料的锅炉,排烟温度高(150~250℃),并含有约15~19%的水蒸气(容积成分),是烟气热量的主要携带者。如果将锅炉的排烟温度降到水蒸汽露点以下,烟气中的水蒸汽就会凝结而放出汽化潜热,将其回收利用的锅炉称为冷凝式锅炉。传统的冷凝式锅炉为了利用烟气余热,通常在烟气出口处安装烟气余热回收装置或用来加热锅炉给水,或用来加热软水箱内水。前者就要求锅炉必须连续给水,势必会造成给水温度波动大,控制复杂。后
Gas-fired boilers, which have high flue gas temperatures (150-250 ° C) and about 15-19% water vapor (volumetric), are the main carriers of flue gas heat. If the boiler exhaust gas temperature dropped below the water vapor dew point, the steam in the flue gas will condense and release latent heat of vaporization, and the boiler which is recycled will be called a condensing boiler. In order to utilize the waste heat of the flue gas, a conventional condensing boiler is usually equipped with a flue gas heat recovery device at the exit of the flue gas to heat the boiler feed water or to heat the water in the soft water tank. The former requires the boiler must be continuous water supply, it is bound to cause water temperature fluctuations, control complex. Rear