Blast furnace hot blast stove fire well wall brick collapse early warning and control process

Abstract

The invention relates to a blast furnace hot blast stove fire well wall brick collapse early warning and control process which comprises the following steps: opening an ignition hole above a hot blaststove combustor in a planned manner for visual inspection by utilizing a blast furnace regular repair hot blast stove stop operation opportunity; if it is confirmed that bricks fall off from the upper portion of the combustor, giving an early warning prompt, meanwhile, reducing the arch crown temperature of the combustion furnace by 5-10 DEG C according to conditions, and delaying further deterioration of collapsed bricks through technological parameter adjustment; observing the maximum coal gas burning amount of the brick collapse hot-blast stove under normal coal gas pressure; under the condition that the residual oxygen content in the flue gas is normal, increasing the air-fuel ratio of the burning furnace by 0.05-0.08%, and increasing the excess air coefficient of the burning furnace;and periodically executing the steps 1 to 4, carrying out early warning and prompting according to the brick collapse condition of the fire well wall, and carrying out process parameter control adjustment according to trend change. The process has good economic benefits in the aspects of increasing the productivity and reducing the fuel consumption; and hazardous substances such as a flue pipeline, waste heat recovery and thinning generated by a chimney can be eliminated, and good popularization significance is achieved.

Description

technical field [0001] The invention relates to the technical field of blast furnace hot blast stove technology, more specifically, it relates to a blast furnace hot blast stove fire well wall collapse warning and control technology. Background technique [0002] Due to the structural characteristics of internal combustion hot blast stoves, bricks in the fire well wall are most likely to collapse, and the refractory bricks are directly smashed on the burner, resulting in gas failure and a sharp drop in air temperature. The iron-making industry has learned from existing cases that from the discovery of the collapsed bricks in the fire well wall of the hot blast stove to the failure of the gas to burn in and the shutdown of the hot blast stove, the fastest time is only 2 to 3 days. Planned maintenance of hot blast stoves. Because the production cycle of refractory materials is more than 6 months, it usually takes 9 to 12 months to prepare. All the steel mills were caught off ...

AI Technical Summary

Problems solved by technology

After a hot blast stove cannot be produced, the air temperature of the blast furnace will drop from above 1100°C to below 900°C, and the blast furnace will eventually stop production due to high fuel consumption, abnormal furnace conditions, and serious iron costs exceeding the plan to repair the hot blast stove, resulting in huge losses

If the collapsed bricks and trends of the furnace wall of the hot blast stove can be analyzed in a forward-looking manner, early warning and reminders can be provided, and then targeted control can be carried out from the technical point of view, then the state control of the hot blast stove and the preparation for maintenance and renovation can be organized and implemented in an orderly manner, while the existing There is no comprehensive technology for early warning and control of blast furnace hot blast stove fire well wall collapse bricks in the current blast furnace hot blast stove technology

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