公开(公告)号：US20230287529A1

公开(公告)日：2023-09-14

申请号：US17927057

申请日：2021-07-22

Applicant: SOOCHOW UNIVERSITY

Inventor： Shaoyan HU ,  Rong ZHU ,  Deyong WANG

IPC: C21C5/34 ,  C21C5/46

CPC classification number: C21C5/34 ,  C21C5/4606 ,  C21C2005/4626

Abstract: A blowing control method for maintaining a mushroom head of a bottom-blowing nozzle converter is disclosed. Considering the actual state of the mushroom head at the end of the bottom-blowing nozzle tip, the real-time molten steel overheating change during the blowing process, the process requirements of different stages of blowing conversion, and the macroscopic heat balance of the converter, the oxygen-carbon dioxide-lime powder blowing parameters of the inner tube of the bottom-blowing nozzle are dynamically adjusted during the converter smelting process of the bottom-blowing nozzle converter so as to control the cooling intensity, thus achieving precise control of the size of the mushroom head. The present invention maintains the basic stability of the size of the mushroom head at the end of the bottom-blowing nozzle tip, avoiding nozzle blockage caused by an oversized mushroom head and rapid erosion of the nozzle caused by an undersized mushroom head.

公开(公告)号：US20220235427A1

公开(公告)日：2022-07-28

申请号：US17476501

申请日：2021-09-16

Applicant: University of Science and Technology Beijing ,  Soochow University

Inventor： Rong ZHU ,  Shaoyan HU ,  Kai DONG ,  Rongfang SU ,  Weifeng LI

IPC: C21C5/46 ,  C21C5/48 ,  F27D3/16 ,  C21C5/30

Abstract: A long-life service method for powder-bottom-injecting converter based on collaborative hot replacement of furnace bottom and bottom purging brick belongs to the field of steelmaking technologies using powder-bottom-injecting converters. According to equipment characteristics, process characteristics, and erosion characteristics of the powder-bottom-injecting converter, the design, arrangement, installation, use, maintenance, and replacement of the bottom purging/powder injection bricks are systematically optimized and improved, a technology of automatically detecting the erosion height of bottom purging bricks is adopted, and hot replacement of bottom purging/powder injection bricks and hot replacement of the converter furnace bottom are used collaboratively, which not only can prolong the service life of a single bottom purging/powder injection brick, but also can greatly prolong the overall life of the powder-bottom-injecting converter from 1000-3000 heats in the prior art to 6000-10000 heats. Hence, the life of the powder-bottom-injecting converter is as long as that of a conventional converter.