Abstract: Structure of the large-scale thermohydrogen treatment furnace designed with cold wall structure is complex,and the thickness of heat insulation panel of multi-layer heat insulation structure furnace lining is very thin,which makes meshing and simulated calculation to be very difficult.So the full-size fluid-thermal-solid coupling simulation of the thermohydrogen treatment furnace was realized by adopting a simplified idea of equivalent thermal resistance and assuming the multi-layer furnace structure being equivalent to one layer,which still ensures the calculation accuracy and can save the calculation resources.The results of evaluation of furnace heat insulation effect show that when the furnace temperature is 1000 ℃,the outer wall temperature of the furnace is only 200-350 ℃ and distributed in a stripe shape.The outer wall temperature of the furnace shell designed by the cold wall structure is about 25 ℃,which has good heat preservation and heat insulation effect.The maximum thermal stress is 264 MPa,which is located at the base of the material platform.The tensile test results show that the tensile strength of Q235 steel used for the material platform base is about 565 MPa after hydrogen permeation treatment at 300 ℃,and the safety factor is 2.14.Such temperature field and thermal stress field analyses of the furnace and safety reserve coefficient evaluation in this study may provide ideas for the full-scale simulation of large-scale thermohydrogen treatment furnace,and data support for the furnace structural design.

Key words: thermohydrogen treatment furnace, simulation analysis, hydrogen embrittlement, thermal stress