Abstract: A great amount of high temperature off-gas with dust is generated during the smelting process of electric arc furnace (EAF). There are many problems such as part of the waste heat is not recovered, high de-dusting load, low steam pressure and difficult utilization in the off-gas cooling ways, which are widely used now. According to this situation, Total Waste Heat Recovery Device for off-gas from Electric Arc Furnace is developed. This device can recover 2100℃～250℃ total waste heat of off-gas from the EAF fourth hole and has the advantages of proper excess air factor, high sedimentation efficiency, high pressure steam, long life span boiler and so on. A demonstration project was built on a 110t EAF and tests were carried out, the test results show that the temperature of the off-gas at the outlet of the tube waste heat boiler is 250℃ below， sedimentation efficiency of the sedimentation chamber is more than 94%. These results reach the expected index of the device. Meanwhile the problems of the Total Waste Heat Recovery Device are analyzed.

Key words: electric arc furnace, off-gas, waste heat, sedimentation efficiency, excess air factor