Converter gas blending device for hot blast stove

Abstract

The invention discloses a converter gas blending combustion device for hot blast furnaces. The converter gas blending combustion device comprises a converter gas main branch pipe connected with a converter gas main pipe network. A converter gas sub-branch pipe is led out of the converter gas main branch pipe corresponding to each hot blast furnace. Each converter gas sub-branch pipe is communicated with a blast furnace gas sub-branch pipe of the corresponding hot blast furnace through an ejection pipe. Each ejection pipe is inserted into the corresponding blast furnace gas sub-branch pipe. The insertion position of each ejection pipe is located between a blast furnace gas sub-branch pipe flow regulating valve and a blast furnace gas sub-branch pipe shut-off valve on the corresponding blast furnace gas sub-branch pipe. A converter gas sub-branch pipe flow regulating valve is arranged on each converter gas sub-branch pipe. The converter gas blending combustion device has the advantages that the phenomenon of backward flow of blast furnace gas can be effectively avoided; an inlet valve of a blast furnace gas main branch pipe does not need to be frequently and substantially turned down, a flow regulating valve on the converter gas main branch pipe does not need to be adjusted frequently, and the use safety is high.

Description

technical field [0001] The invention relates to a converter gas mixed burning device for a hot blast stove. Background technique [0002] The hot blast stove is one of the main supporting equipment of the blast furnace in the ironworks. The function of the hot blast stove is to continuously provide high-temperature hot air for the blast furnace. At present, for every 100°C increase in the air temperature of high-temperature hot air above 1000°C, the coke ratio can be saved by 15-20 kg / t, and every 100°C increase in the air temperature of high-temperature hot air below 1000°C can save 30 kg / t of coke ratio, so the increase Air temperature is an important measure for enterprises to save energy, reduce emissions, reduce costs and increase efficiency. [0003] Converter gas is a combustible gas with high calorific value produced in the process of converter steelmaking. The calorific value of a unit of converter gas is about 6000KJ, while the calorific value of a unit of blast f...

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Problems solved by technology

The above two converter gas blending devices have the following disadvantages: (1) Because the pressure junction of blast furnace gas and converter gas is often in fluctuations and the characteristics of the original pipe network, it is often necessary to greatly reduce the main branch of blast furnace gas Imported valves have certain safety hazards; (2) For the same reason, especially when the blast furnace gas pressure does not match the converter gas pressure, the injection function "fails" and "backflow" occurs, that is, the blast furnace gas backflows into the converter gas pipeline , which leads to the failure of the mixed firing function; (3) Due to the characteristics of the hot blast stove operation, the stove is replaced every hour. During the furnace replacement process, one hot blast stove stops firing within 12 to 15 minutes (take 3 hot blast stoves as an example , when the hot blast stove is replaced, the three hot blast stoves are changed from 2 burning and 1 delivery to 1 burning, 1 stop and 1 delivery), so it is necessary to frequently adjust the flow regulating valve in the main branch pipe of the converter gas, which will easily lead to the stability of the pressure and flow of the entire system poor sex

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