| 摘要 |
A retort furnace for heat and/or thermochemical treatment designed for technological process in protective gas atmosphere, process gas atmosphere or in vacuum, and used inter alia for annealing pipes made of austenitic alloys, having among other things: a cylindrical outer body with a lid equipped with an active thermal barrier, a cylindrical retort, thermal insulation, a heating system located in the thermal insulation, a cooling system of the furnace. The active thermal barrier constitutes the radiation screens, in the form of at least two metal boards, installed on brackets located at the lid inside the retort. Additionally, radiation caulking rings are located in the extreme areas of the brackets and, circumferential sealing rings are permanently fixed in the casing of the retort. |
| 主权项 |
1. A retort furnace for heat or thermochemical treatment designed for technological process in a protective gas atmosphere, a process gas atmosphere or in a vacuum, and used at least for annealing pipes made of austenitic alloys, the retort furnace comprising:
a cylindrical outer body having a lid equipped with an active thermal barrier; a cylindrical retort made of at least one of: i) steel, ii) heat-resisting alloys, and iii) creep-resisting alloys, the cylindrical retort separating a processing atmosphere from an ambient atmosphere; a thermal insulation disposed outside of the cylindrical retort; a heating system located in the thermal insulation; a cooling system including a plurality of air blowers and two top hatches for each of the plurality of air blowers, the top hatches and the plurality of air blowers being disposed on opposite ends of the cylindrical retort; and a barrier temperature sensor extending through the lid, wherein
the lid has a separate cooling system,the active thermal barrier comprises: i) a plurality of brackets extending from the lid into the cylindrical retort, (ii) a temperature evening screen connected to at least one bracket and positioned remote from the lid, (iii) a plurality of radiation screens, in the form of at least two metal boards, installed on at least one bracket and located between the lid and the temperature evening screen, the radiation screens having barrier heating elements in the form of resistance wire, which are located behind the radiation screens, on the inside of the cylindrical retort, iv) radiation sealing rings located at an end of at least one bracket opposite from the lid and extending beyond the temperature evening screen,a thermocouple of the barrier temperature sensor is located in a range of the barrier heating elements,an additional thermal screen is located behind the barrier heating elements, andthe cylindrical retort comprises circumferential sealing rings permanently fixed in a casing of the cylindrical retort and located adjacent to the radiation sealing rings when the lid is closed in the cylindrical retort. |
