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蒸汽锅炉的冷端一般在空气预热器中将从省煤器出来的烟气冷却到经济的排烟温度,同时把空气预热到燃烧所需要的温度。烟气温度的冷却和燃烧空气的预热不能任意进行的,它受到三个因素的限制:1.与燃烧装置型式有关的热空气温度;2.烟气水当量与燃烧空气水当量之比;3.烟气酸露点。一、与燃烧有关的热空气温度按照锅炉所使用的燃烧方式,要求有不同的热空气温度:炉排燃烧最低,煤粉燃烧最高,油和气体燃烧居于二者之间。炉排锅炉为100～160℃,对贫煤燃料采用高的数据,高挥发物的煤和硬褐煤采
The cold end of a steam boiler generally cools the flue gas coming out of the economizer to an economical flue gas temperature in an air preheater while preheating the air to the temperature required for combustion. Cooling of the flue gas temperature and preheating of the combustion air can not be carried out arbitrarily and are limited by three factors: 1. the hot air temperature associated with the type of combustion device; 2. the ratio of the flue gas water equivalent to the combustion air water equivalent; 3. Flue gas acid dew point. First, with the combustion-related hot air temperature in accordance with the type of combustion used in the boiler, require a different hot air temperature: lowest grate combustion, pulverized coal combustion highest oil and gas live in between the two. Grate boiler is 100 ~ 160 ℃, lean coal fuel using high data, high volatile coal and hard brown coal mining