公开(公告)号：EP4450651A1

公开(公告)日：2024-10-23

申请号：EP22923522.1

申请日：2022-12-13

申请人： Xinjiang Bayi Iron & Steel Co., Ltd.

发明人： JI, Shumin ,  XU, Xiaobing ,  JIA, Zhiguo ,  CHEN, Ruoping ,  LI, Tao ,  YANG, Chunlei

IPC分类号： C21B5/06 ,  C21B5/00 ,  C21B7/16

摘要： The present disclosure discloses method for ironmaking in blast furnace with hydrogen enriched and carbon recycling, including increasing a proportion of oxygen blown through tuyeres to an ultra-high level of 35% to 50% with an oxygen enrichment in a traditional blast furnace as a reference; removing CO 2 from top gas by using an amine scrubbing method, and then injecting it into the blast furnace with hydrogen enriched and carbon recycling; a distance between the inlet of gas for heating furnace body and the gas injection ports of the composite tuyere device is L1, and a distance between the inlet of gas for heating furnace body and the top of furnace is L2, where L1: L2 is 6.5: 8.2, an angle between the inlet of gas for heating furnace body and a lower part of outer wall of the furnace body is β, where β is in a range of 112° to 130°, the temperature of the high-temperature upgraded gas entering the blast furnace is 950°C when entering from the furnace body and 1200°C when entering through the tuyeres, using sintered ore with a basicity R = 1.75 ± 0.05, and checking charges according to a requirement for slag to contain more than 15% Al 2 O 3 and to have a binary basicity B2 = CaO/SiO2 = 1.02-1.10; doping decarbonized gas from the Oxyfurnace and coke oven gas into the recycling gas pipeline at the inlets of the composite tuyere device, with a combined amount thereof is 12% to 25% of the total amount of high-temperature upgraded gas introduced into the blast furnace with hydrogen enriched and carbon recycling.