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上钢一厂二炼钢年产钢60万吨,配有2座公称容量为5t/h的化铁炉,该化铁炉已进行余热回收,并用来预热助燃空气,热风经回炉总风管和支管送入炉内,风温达300℃左右。 回炉总风管自1983年大修改造后采用石棉泥、石灰、水泥混合涂料隔热。但石棉隔热性能差,遇水雾后易粉碎和脱落,使用寿命短。裸露的管外壁温度为150℃,使流经这段管道的热风温降达8.3℃,风管散热损失为4831GJ/a;平均热风损失热量达8.03MJ/t铁。为了减少这部分热损失,上钢一厂选用05型烧结珍珠岩在回炉总风管和进风三
Steel plant a second steelmaking 600,000 tons of steel, with 2 nominal capacity of 5t / h of iron furnace, the iron furnace has been waste heat recovery, and used to preheat the combustion air, hot air by the total wind back Tube and branch pipe into the furnace, the air temperature of about 300 ℃. The total air duct back to the main repair since 1983, the use of asbestos mud, lime, cement mixed paint insulation. However, asbestos insulation performance is poor, easy to crush and fall off after the mist, the service life is short. The temperature of exposed tube outer wall is 150 ℃, the temperature of hot air flowing through this pipe reaches 8.3 ℃, the heat loss of air duct is 4831GJ / a; the average heat loss of hot air reaches 8.03MJ / t. In order to reduce this part of the heat loss, the steel plant selected 05 sintered perlite in the total return air duct and into the wind three