论文部分内容阅读
干燥1吨有用鑄件的砂型和泥心所耗的燃料为100～150公斤。按机械制造業对鑄件的需要量来看,在这道工序上所花費的燃料总量是相当大的。因此,在干燥方面节約燃料的每一措施,其結果对国民經济都是具有莫大意义的。进行干燥的溫度为400℃左右;因此一般用冷空气將1000℃以上的爐气加以滲淡。这些用来滲淡的冷空气在离爐进入烟囱时的溫度为150～200℃,即帶走了將其加热到达一溫度所耗的热量。为避免这一非生产的热量損失,可以采用离爐廢气再循环以降低燃气溫度。在这种情况下离爐廢气量与一
The fuel used to dry 1 ton of useful casting sand and mud is 100 to 150 kg. According to the requirements of castings for machinery manufacturing, the total amount of fuel consumed in this process is quite large. Therefore, every measure to save fuel in terms of drying, the result is of great significance to the national economy. The drying temperature is about 400° C.; therefore, the furnace air above 1000° C. is generally diluted with cold air. These cold air used for diffusing are at a temperature of 150-200[deg.] C. from the furnace when entering the chimney, ie, take away the heat consumed to heat it up to a temperature. To avoid this non-production heat loss, off-gas exhaust gas recirculation can be used to reduce the gas temperature. The amount of off-gas from the furnace in this case