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    燃气锅炉烟气余热回收技术
    来源:澳门在线网站大全 发布时间:2021-09-17

    与传统燃煤锅炉相比,燃烧天然气的锅炉虽然排放的二氧化硫及氮氧化物的含量很少,减轻了对环境的压力,但燃烧后产生的大量水蒸气随高温烟气排放到环境中,仍然造成了能量的严重浪费。
    Compared with traditional coal-fired boilers, natural gas fired boilers emit little sulfur dioxide and nitrogen oxides, reducing the pressure on the environment, but a large amount of water vapor generated after combustion is discharged into the environment with high-temperature flue gas, which still causes a serious waste of energy.
    而采用冷凝式锅炉将高温烟气中的显热和潜热予以回收,可以达到充分利用能源降低运行成本的效果。
    The condensing boiler is used to recover the sensible heat and latent heat in the high-temperature flue gas, which can make full use of energy and reduce the operation cost.
    一、使用冷凝置换器
    1、 Use condenser displacer
    冷凝式换热器就是增设在天然气锅炉尾部的余热回收装置,当烟气在通道内通过传热面,温度降至露点温度以下,从而使排烟中的水蒸气凝结释放潜热传递给回收工质,可以将排烟中大量的能量加以回收利用,从而达到节能环保的效果。
    Condensing heat exchanger is a waste heat recovery device added at the tail of natural gas boiler. When the flue gas passes through the heat transfer surface in the channel, the temperature drops below the dew point temperature, so that the water vapor in the flue gas condenses and releases the latent heat to the recovered working medium, which can recover and utilize a large amount of energy in the flue gas, so as to achieve the effect of energy conservation and environmental protection.
    二、烟气分析
    2、 Flue gas analysis
    天然气成分绝大部分为烃,燃气锅炉排烟中水蒸气的含量较高。每1m3天然气燃烧后可以产生1.55kg水蒸气,汽化潜热大约为3700kJ/Nm3,占天然气的低位发热量的10%以上。传统锅炉中,排烟温度一般在160~250℃,烟气中的水蒸气仍处于过热状态,不可能凝结成液态的水而放出汽化潜热。
    Most of natural gas is hydrocarbon, and the content of water vapor in flue gas of gas-fired boiler is high. 1.55kg water vapor can be produced per 1m3 of natural gas after combustion, and the latent heat of vaporization is about 3700kj / Nm3, accounting for more than 10% of the low calorific value of natural gas. In traditional boilers, the flue gas temperature is generally 160 ~ 250 ℃, and the water vapor in the flue gas is still superheated. It is impossible to condense into liquid water and release the latent heat of vaporization.
    因此传统的天然气锅炉理论热效率一般只能达到95%左右,利用冷凝式换热器只要把烟气温度降到烟气露点温度以下,就可回收烟气中的显热和水蒸气的凝结潜热,按低位发热量为基准计算,天然气锅炉热效率可达到和超过109%。
    Therefore, the theoretical thermal efficiency of traditional natural gas boilers can only reach about 95%. As long as the flue gas temperature is reduced below the flue gas dew point temperature by using the condensing heat exchanger, the sensible heat in the flue gas and the condensation latent heat of water vapor can be recovered. Calculated based on the low calorific value, the thermal efficiency of natural gas boilers can reach or exceed 109%.

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