Blast furnace oxygen adding coal injection method and apparatus thereof

Abstract

The invention discloses a blast furnace oxygen adding coal injection method and an apparatus thereof, and relates to a blast furnace coal injection method. According to the apparatus, a pressure stabilizing nitrogen tank is communicated with a blowing tank by a manual nitrogen valve; the blowing tank is communicated with the blast furnace by a blowing pipe; an air feeding nitrogen tank is communicated with an air feeding total pipe by the manual nitrogen valve and a nitrogen flow meter; the air feeding total pipe is communicated with the blowing pipe. The apparatus is characterized in that: a high pressure oxygen pipe is additionally arranged, and is communicated with the air feeding total pipe sequentially by a check valve, a fast switch electromagnetic valve, an oxygen flow meter, an electromagnetic regulating valve and a manual oxygen valve; the air feeding total pipe forms a bypass communication with an oxygen analyzer for oxygen amount detection; the pipeline between the manual nitrogen valve and the nitrogen flow meter forms a bypass communication with an oxygen analyzer for inverted fleeing oxygen detection; the information output ends of the two flow meters and the two oxygen analyzers are respectively communicated with the input end of a PLC central processing unit; the output end of the PLC central processing unit is connected with the information input ends of the electromagnetic regulating valve and the fast switch electromagnetic valve. With the present invention, the coke ratio and the fuel ratio are substantially reduced, and the burning rate of the coal fines is significantly improved.

Description

Technical field: [0001] The invention relates to a blast furnace coal injection method, in particular to a process for adding oxygen to a coal injection pipeline. Background technique: [0002] The coal injection system of the No. 5 blast furnace of Sansteel adopts the pulverized coal dense phase conveying technology, and uses high-pressure nitrogen as the power to inject pulverized coal. The coal for injection is anthracite coal with abundant resources in the province. The advantage of the whole process is safe, stable, uniform and continuous coal injection. [0003] Since the opening of the No. 5 blast furnace, operational measures such as full air temperature (air temperature up to 1200°C), high oxygen enrichment (oxygen enrichment rate > 3%), etc., which are conducive to increasing the coal injection ratio have been taken, but the coal injection ratio has been hovering at a relatively low level. Low level, high raw fuel consumption, many times to increase the coal ra...

AI Technical Summary

Problems solved by technology

[0003] Since the opening of the No. 5 blast furnace, operational measures such as full air temperature (air temperature up to 1200°C), high oxygen enrichment (oxygen enrichment rate > 3%), etc., which are conducive to increasing the coal injection ratio have been taken, but the coal injection ratio has been hovering at a relatively low level. Low level, high raw fuel consumption, many times to increase the coal ratio but failed due to the influence of the furnace condition

The main reason is: Sangang uses a single anthracite injection

At present, most of the blast furnaces at home and abroad with a stable and relatively high coal injection ratio use injection mixed coal (mixed coal is coal powder mixed in a certain proportion according to the performance of bituminous coal and anthracite), and there is no bituminous coal mine in Fujian Province Due to the geographical location of Sangang, it is costly and difficult to transport bituminous coal from other provinces, and the raw coal site is small. The external environment forces our factory to use anthracite as coal for injection

Disadvantages of anthracite compared to blended coals are poor combustibility and high ignition point

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