Method for judging cohesive zone formation process in blowing-in process of blast furnace

A soft-melting belt and blast furnace technology, applied in the field of blast furnace ironmaking, can solve problems such as large economic losses, collapse of materials, pipelines and suspended materials, and influence on the furnace opening process.

Inactive Publication Date: 2015-05-13
SHANXI TAIGANG STAINLESS STEEL CO LTD
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Problems solved by technology

[0006] If the operating parameters of this node are not well controlled during the furnace start-up process, abnormal furnace conditions such as material collapse, pipelines, and suspended materials may occur, which will affect the furnace start-up process, and even lead to furnace start-up failure and huge economic losses.

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  • Method for judging cohesive zone formation process in blowing-in process of blast furnace
  • Method for judging cohesive zone formation process in blowing-in process of blast furnace
  • Method for judging cohesive zone formation process in blowing-in process of blast furnace

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Embodiment Construction

[0016] The air supply situation during the start-up process of a large blast furnace in a domestic factory. The blast furnace was ignited to supply air at 10:00. After the air supply, the furnace material began to slowly descend. At 11:30, the 4# iron mouth began to blow gas, and the cumulative wind was 1118Km 3 , 11:53 blast furnace gas delivery, 12:20 top pressure after gas delivery from normal pressure to high pressure. 17:05 Furnace top gas analysis CO 2 The content increased significantly, the wind pressure began to rise at 18:00, and the soft melting zone began to form, with a cumulative wind volume of 2193Km 3 , The maximum pressure difference is 145kpa, which realizes the smooth transition of the formation process of the furnace soft melt zone.

[0017] CO in gas from 17:05 2 At 18:05, the wind pressure increased significantly. At 19:05, the top temperature increased rapidly. At 20:05, the wind pressure decreased. The CO2 content and gas utilization rate continued to...

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Abstract

The invention discloses a method for judging a cohesive zone formation process in a blowing-in process of a blast furnace, and belongs to the field of blast furnace ironmaking. The method comprises the following contents: after air blowing is performed for 9-12 h, the CO2 content of stock gas is 12.0-15%; and after the air blowing is performed for 10-14 h, the thermal air pressure in a furnace is 204-242 kPa, and the differential pressure is 114-127 kPa. The method disclosed by the invention can guide the control on differential pressures and air permeability indexes in the cohesive zone formation process in the blowing-in process of the blast furnace, thereby providing production practice operation basis for the implementation of smooth air adding for blowing-in, promoting the smooth air adding for the blowing-in of large blast furnaces, and laying a good foundation for the rapid realization of target outputs and profits, so that better blowing-in technical and economical indexes are obtained.

Description

technical field [0001] The invention belongs to the field of blast furnace ironmaking, and relates to furnace start-up production and the judgment of the formation process of soft melting zones during the furnace start-up process. Background technique [0002] The formation process and characterization parameters of the reflow zone during the start-up of a large blast furnace: the appearance of CO in the top gas 2 , and as the gas temperature rises and CO, CO 2 The composition is gradually stable, which means that the reflow zone in the furnace has been formed. In the previous blast furnace start-up process, the formation process of the soft melting zone could not be well described, and quantitative parameters were not used. [0003] 8 to 14 hours after the ignition of the large-scale blast furnace is the formation period of the soft melting zone. Determine the appropriate air speed to make the gas fully heat the charge, and the heated charge is smoothly delivered to the h...

Claims

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Application Information

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IPC IPC(8): C21B5/00
Inventor 唐顺兵李红卫李夯为梁建华巩黎伟杨志荣陈树文赵新民郑伟刘文文
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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