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在锅炉机组内燃用含硫重油和硫化氢含量大于0.15%的炼焦煤气,将导致空气预热器的严重腐蚀和污脏,并使锅炉机组的经济性大为下降。用水和蒸汽对空气预热器受热面进行冲洗和吹灰更使腐蚀严重。再生式空气预热器的换热元件进行烘焙,然后吹灰,因密封元件与转子本身膨胀不同,将提高漏入烟道内的空气量。对管式空气预热器,钢珠除灰的效果不大。为了加热进入蒸汽锅炉炉膛的空气,从1960起,苏联和其他国家采用了带移动的密集的颗粒状载热体的空气预热器,并按交叉运动原则组成热交换系统(图1)。在这种情况下形成了不太厚的、连续的换热层,简化了风道和热交换器的结构,并提高了效果;这与逆流系统有很大不同。
The burning of sulfur-containing heavy oils and coking gases with hydrogen sulfide content greater than 0.15% within the boiler unit will result in severe corrosion and fouling of the air preheater and greatly reduce the economy of the boiler unit. Washing and blowing soot on the heated surface of the air preheater with water and steam are more serious. Regenerative air preheater heat exchanger components for baking, and then soot, due to expansion of the sealing element and the rotor itself will increase the amount of air leakage into the flue. On the tube air preheater, steel ball ash is not effective. In order to heat the air entering the hearth of the steam boiler, from 1960 the Soviet Union and other countries used air preheaters with moving dense particulate heating elements and formed a heat exchange system according to the principle of cross-over (Fig. 1). In this case, a not too thick, continuous heat transfer layer is formed, simplifying the structure of the air duct and the heat exchanger and increasing the effect; this is very different from the countercurrent system.