Control system and method for hydrogen-rich blast furnace based on low-quality oxygen and large humidification

Abstract

The invention relates to a hydrogen-rich blast furnace control system and method based on low-quality oxygen and large humidification and belongs to the technical field of steel production. The systemcomprises a blast furnace body; the top end of the blast furnace body is provided with a furnace charge adding unit and a gas processing unit; the bottom end of the blast furnace body is provided with a slag processing unit; one side of the blast furnace body is further provided with an oxygen making unit for providing low-concentration oxygen and a high-temperature water vapor conveying unit, the oxygen making unit is connected with one end of an oxygen coal dust spray-blowing unit, and the other end of the oxygen coal dust spray-blowing unit is connected with a blast furnace body; and a water vapor control unit and an air mixing chamber are sequentially arranged between the water vapor conveying unit and the blast furnace body, and the interior of the air mixing chamber further communicates with the oxygen making unit. By means of the system, a great amount of hydrogen can be produced inside a blast furnace, emission of carbon dioxide is reduced, the low-concentration oxygen is usedfor burning coke as much as possible in unit time in order to offset heat energy consumption, and the production efficiency of the blast furnace is overall improved.

Description

technical field [0001] The invention relates to blast furnace smelting and belongs to the technical field of iron and steel production, in particular to a hydrogen-rich blast furnace control system and method based on low-quality oxygen and large humidification. Background technique [0002] The existing blast furnace process is basically maintained at the production of one ton of molten iron, which needs to consume about 500kg / t of fuel. Given that CO 2 Due to the huge impact of emissions on the environment, people do everything possible to improve the existing blast furnace process, hoping to improve reduction and reduce CO 2 emission. BF CO 2 Emissions account for 60% of the entire steel industry, and the steel industry's CO 2 Emissions account for about 15% of the entire industrial emissions, and China's annual CO 2 The emission is about 180 tons, and the blast furnace contributes nearly 1.8 billion tons. This figure contributes a lot to the extreme changes in the gl...

AI Technical Summary

Problems solved by technology

Since these reducing agents need to be decomposed into H 2 , CO and other reducing agents, these processes are all endothermic processes, all of which require a large amount of energy consumption. Excessive consumption of energy in the lower part of the blast furnace will inevitably destroy the reduction distribution of the previous blast furnace process, resulting in a fragile balance of energy utilization of the blast furnace. This process also needs to be newly built. It is beneficial to inject various facilities and equipment, which cannot be realized on the current blast furnace

[0016] (3) The blast furnace is a part of the iron and steel complex. The blast furnace is not only a molten iron production unit, but also has the responsibility of matching the upstream and downstream processes. The new process requires the establishment of many blast furnaces to meet the current production capacity requirements after the blast furnace is large-scaled. At the same time, the increase in the number of blast furnaces greatly increases the difficulty of production scheduling

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