我厂轧钢生产的开坯和热带加热炉都是利用重油作燃料。最近采用一种两组并联的片状予热器,放在烟道中回收余热,节油效果显著。这种予热器是由每组40条椭园形立式带吸热片的耐热铸铁管组成,如图所示。废热风从左至右全部通过两组管外的空隙,冷 I plant rolling production of billet and tropical furnace are the use of heavy oil for fuel. Recently, a two-group parallel plate preheater was used to recover the waste heat in the flue gas duct. The fuel saving effect was remarkable. This preheater is made up of 40 heat-resistant cast iron pipes each having 40 oval vertical heat sinks as shown. Waste hot air from left to right through the two groups of gaps outside the tube, cold