Method and device for blast furnace to blow coal powder

A pulverized coal and blast furnace technology, applied in blast furnaces, blast furnace details, furnaces, etc., can solve the problems of large heat dissipation, large heat loss, and shortened service life of straight blowing pipes, and achieve enhanced heat and mass transfer, increased residence time, and service life long effect

CN102485913AInactive Publication Date: 2012-06-06张昭贵
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2012-06-06
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention puts forward a method and device for a blast furnace to blow coal powder. Characterized by employment of several short spray guns, a large incidence angle, accurate positioning of spray guns, small heat radiation and long life of blowpipes, and adoption of ceramic nozzles, the new method and new device of the invention aims to eliminate various defects in prior art, such as small coal powder incidence angle, restriction by high speed hot airflow, inadequate mixing with hot air, long length and long service life of spray guns, large heat radiation and short service life of blowpipes, and hard use of oxygen-coal lances, etc. According to the invention, on the blowpipes of each air ports, each short spray gun is inserted into each installation seat, and coal powder blown into a blast furnace enters from blowing inlets positioned on a lateral side of each installation seat, then reaches the inside of each short spray gun through coal spraying holes that are disposed on tube walls of the short spray guns and are over against the blowing inlets, and is finally blown into the furnace through each short spray gun. The device of the invention at least comprises: a blowpipe with a coal powder precombustion function, short spray guns, installation seats, ball valves, locking devices, coal conveying branch pipes, a distributor, a small ball valve, a coal conveying pipe, and an inlet connecting piece.
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Description

technical field

[0001] The invention belongs to the technical field of ironmaking, and relates to blast furnace coal injection technology, in particular to a method and device for blast furnace pulverized coal injection. Background technique

[0002] As we all know, the existing method of blast furnace pulverized coal injection is: on the straight blowing pipe of each tuyere, one or two spray guns are obliquely inserted into the straight blowing pipe at an angle of 10-13° between the center line and the straight blowing pipe center line. The blowpipe, the end of the spray gun exposed outside the pipe is used as the coal injection inlet, and the coal powder is directly injected into the straight blowpipe through this inlet, and then enters the blast furnace through the tuyeres together with the hot air. This method of injecting pulverized coal has caused the following problems:

[0003] (1) The incident angle of pulverized coal is small, and it is restricted by the high-spee...

Examples

Embodiment Construction

[0031] Such as figure 1 As shown, a method for blowing pulverized coal into a blast furnace is: on the straight blowing pipe 3 of each tuyere 1, insert each short spray gun 4 into each mounting seat 5, and the coal powder injected into the blast furnace is from each mounting seat 5 The injection inlet 6 that is opened on the side enters, and then arrives in each short spray gun 4 through the coal injection hole 7 that is opened on the short spray gun 4 pipe wall facing the injection inlet 6, and then the pulverized coal is sprayed by each short spray gun 4 It is sprayed into the hot air, and finally enters the blast furnace through the tuyere 1 together with the hot air.

[0032] Such as figure 1 and image 3 As shown, a blast furnace pulverized coal injection device is at least composed of a straight blow pipe 3, a short spray gun 4, a mounting seat 5, a ball valve 9, a locking device 10, a coal delivery branch pipe 11, a distributor 12, a small ball valve 14, a coal delive...