JL 70型及RL 5 0 0型热风炉是2种大容量、多用途的新型热源装置,在设计上首次采用了多头异向螺旋槽管换热技术,大大提高了换热效率(换热效率达75 %以上) ,单位热量费用仅为4 .2 2元/GJ ,主要性能指标达到了国内先进水平,通过了部级鉴定,并获得国家专利,被列为2 0 0 1年国家科技 JL 70 and RL 500 hot-blast stoves are two new high-capacity and multi-purpose heat source units. They were designed for the first time with multi-headed, isotropic helical grooved tube heat exchange technology to greatly improve the heat transfer efficiency Up to 75%), the unit cost of heat is only 4.222 yuan / GJ, the main performance indicators have reached the advanced domestic level, passed the ministerial level appraisal, and access to national patents, was listed as 2001 National Science and Technology