Blast furnace comprehensive blasting method and system

Abstract

The invention relates to a blast furnace comprehensive blast method and system. The blast furnace comprehensive blast method comprises a pre-treatment link, a comprehensive waste gas mixing link and aheating blast link. The blast furnace comprehensive blast system comprises a metallurgical waste gas pre-treatment unit, a comprehensive waste gas mixing unit and a comprehensive air blowing unit. According to the blast furnace comprehensive blast method and system, hot-blast stove burning flue gas, lime kiln burning waste gas, steel rolling heating furnace waste gas, other metallurgical waste gases and multiple metallurgical residual rich gas are burnt into waste gas or are directly utilized; and the flue gas or the waste gas is premixed into comprehensive waste gas in proportion in a premixing chamber after being pre-treated and is pressed into an air supply hot-blast stove by a high-pressure fan to heat a regenerative chamber; the comprehensive waste gas exhausted from an air supply hot-blast stove enters a gas storage pressure stabilizing tank; the temperature is stabilized through powder making system waste gas; a certain amount of oxygen is added, the waste gas enters a blast furnace through a hot blast main pipe to be blasted, and therefore, scientific and environment-friendly recycling of the comprehensive waste gas is completed; and compressed air for blasting of the blast furnace can be completely or partially replaced by the comprehensive waste gas according to different proportions of 0-100% in terms of the total amount.

Description

technical field [0001] The invention relates to the technical field of blast furnace smelting, in particular to a blast furnace comprehensive blowing method and system. Background technique [0002] At present, the blast furnace blast operation is realized by the hot blast stove matched with the blast furnace through the following process: ①The furnace gas and combustion-supporting air are mixed and burned in the hot blast stove combustion chamber to produce high-temperature flue gas at 1350°C to 1450°C; ②High-temperature flue gas Enter the regenerator in the hot blast stove, heat the checker bricks and then discharge the hot blast stove; ③After the temperature of the checker bricks reaches the standard, stop firing the furnace, and blow cold air into the regenerator of the hot blast stove from the high-pressure fan (reverse to the high-temperature flue gas) Checker bricks are used for heat exchange, and the air is heated to about 1200°C and enters the blast furnace under pr...

AI Technical Summary

Problems solved by technology

[0008] 1. Final discharge of flue gas from hot blast stove;

[0009] ① The waste heat resources taken away by the flue gas discharged from the chimney have not been fully utilized at present;

[0010] ② The flue gas discharged through the chimney contains 22% to 25% CO 2 The chemical energy (carbon and oxygen) is not used by science, but is emitted into the atmosphere as a greenhouse gas; in addition, there are other components that can perform beneficial transformations such as H 2 O (content is 5% ~ 8%), O 2 (content is 0.5%~1%), N 2 (Content 68%~72%) Not fully utilized

[0011] 2. The exhaust gas emission problem of the milling system;

[0014] 3. A large amount of blast furnace gas with low calorific value has not been used scientifically and is in a surplus state in the current process, so it is forced to release or burn to release

[0015] 4. Lime kiln burner waste gas emission problem;

[0017] 5. The problem of exhaust gas emission from steel rolling heating furnace;

Another problem that exists is the problem of forced release of excess oxygen; coking CDQ, iron-making blast furnace top N 2 Many metallurgical processes such as cooling and sealing, due to the extensive use of N 2 Cause Energy Power Sector O 2 Surplus and forced to release (taking a steel company with an annual output of 16 million tons of steel as an example, the annual release volume is about 50 million m 3 ), resulting in a huge waste of resources

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