JPH05239511A - Method for injecting powder into blast furnace tuyere - Google Patents

Abstract

PURPOSE:To blow in either a large volume of powdery body or plural kinds of powdery materials through a single burner at each tuyere by effectively utilizing an existing powder transportation line without under-taking a large scale modification of the apparatus. CONSTITUTION:By providing two systems of the plural blowing-in transportation lines 2A, 2B arranged at each blast furnace tuyere 4, and by joining each of the transportation lines mutually at the mixer 6, either a large volume of powdery body or plural kinds of powdery bodies are blown-in by a single burner 5 at the each tuyere 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for injecting powder into tuyere of a blast furnace.

[0002]

2. Description of the Related Art There are various methods for injecting powder into tuyere of a blast furnace. However, as shown in FIG. 4, after the powder is distributed from a distributor 1 or each tuyere, Body transport line 2
The burner 5 is inserted from the blow pipe 3 into the tuyere 4, and the equipment is almost the same in each system. (For example, Japanese Patent Publication No. 2-55483). There is also a method of inserting the burner 5 from the blow pipe 3 into the tuyere 4 portion from two directions as shown in FIG.

[0003]

In view of future resource measures and environmental measures, development of a technique for injecting a large amount of coal from tuyere has been promoted. Furthermore, research into the injection of ore, auxiliary materials, and even reduced iron tuyere is underway as a next-generation blast furnace technology, and it is considered that the need for powder injection from the tuyere will increase in the future.

One of the restrictions on the facility upper limit of powder injection into the blast furnace is pressure loss in the powder transportation line. Therefore, if more than the planned amount of powder is to be blown, or if more than one type of powder is to be blown, the amount of blown powder will exceed the capacity of the facility, either a new powder transport line should be created or another transport line should be installed. However, as shown in FIG. 5, a method in which burners are inserted and blown into the tuyere from two directions is generally used.

However, in the former case, the conventional transportation line is not effectively used and is wasted. In the latter case, the blow pipe needs to be remodeled significantly. The present invention relates to a method of injecting powder of fuel, ore, etc. from tuyere in a blast furnace, by effectively utilizing a conventional powder transportation line and without carrying out a major facility modification. This is a method for blowing the powder into the tuyere of the blast furnace, which aims to blow the powder with one burner for each tuyere.

[0006]

Means for Solving the Problems The gist of the present invention for achieving the above object is to inject a powder of fuel, ore or the like from a tuyere of a blast furnace, and a plurality of injections provided for each tuyere of the blast furnace. To the blast furnace tuyere, which is characterized in that two transportation lines are provided, each transportation line is assembled by a mixer, and a large amount of powder or plural kinds of powder is blown by one burner for each tuyere. This is the method for injecting powder.

[0007]

The present invention will be described below with reference to the drawings. Figure 1
Is a schematic view illustrating a powder injection line according to the present invention, and FIG. 2 is a cross-sectional view illustrating a mixer according to the present invention. As shown in FIGS. 1 and 2, the present invention is a method of blowing powder of fuel, ore or the like from a blast furnace tuyere 4 through a burner 5, and a plurality of blowing transportation lines 2A provided for each blast furnace tuyere 4 are provided. And 2B, two systems are provided, and the respective blow-in transportation lines 2A and 2B are mixed by the mixer 6 provided for each tuyere 4 of the blast furnace. In FIG. In which two different distributors 1 are provided (not shown), powders of different types are transported by two systems of blowing transport lines 2A and 2B, mixed by a mixer 6 and blown. Is.

In the mixer 6 according to the present invention, as shown in FIG. 2, the tip of the blow-in transport line 2A is looked into the cylindrical mixing chamber 6A and the tip of the transport line 2B is cylindrical. 6B, the mixing chambers 6A and 6B are connected to each other, and the carrier air line 7 is connected to the downstream side thereof.

In the mixer 6, the powder is sucked and mixed from the blow-in transport lines 2A and 2B by the ejector effect of the high-velocity air flow blown from the carrier air line 7, and is sent to the burner 5. When the blow-in transport line is connected without the mixer 6, the powder is likely to be clogged at the joint, and when there is a pressure difference between the two blow-in transport lines, the low-pressure side transport line. It may not be possible to mix from. In this respect, according to the present invention, the powder is mixed in the mixer 6 by the high-velocity air flow and, at the same time, the mixed powder is transported to the burner 5, so that the powder is not clogged and the backflow does not occur.

[0010]

EXAMPLE A test was carried out in a large blast furnace having an internal volume of 5151 cubic meters by connecting two pulverized coal transportation lines using the present invention to increase the injection amount. FIG. 3 shows the results of measuring the flow rate of the powder with a capacitance type flow meter after the two systems were connected and only one system was blown, and the flow rate of the powder in the mixer after the two systems were blown. As is apparent from FIG. 3, according to the present invention, the blowing lines of the system are gathered by the mixer and the blowing amount can be increased.

[0011]

INDUSTRIAL APPLICABILITY The present invention relates to a method for injecting powder of fuel, ore or the like from tuyere in a blast furnace, by assembling a plurality of injection transportation lines to produce a large amount of powder or a plurality of powders for each blade. It is possible to blow with one burner for each mouth. That is, when blowing a plurality of powders according to the present invention, or when increasing the blowing amount, it is possible to blow a large amount of powders or a plurality of powders by utilizing a conventional transportation line and without making a major facility modification. It will be possible.

[Brief description of drawings]

FIG. 1 is a conceptual diagram illustrating a powder injection line according to the present invention.

FIG. 2 is a cross-sectional view illustrating a mixer according to the present invention.

FIG. 3 is a diagram showing a powder blowing amount when the method of the present invention is carried out.

FIG. 4 is a diagram showing a conventional powder blowing method.

FIG. 5 is a diagram showing a conventional powder blowing method.

[Explanation of symbols]

 2 Blow-in transportation line 4 Blast furnace tuyere 5 Burner 6 Mixer

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akira Matsui 1 Kimitsu, Kimitsu-shi, Chiba Shin Nippon Steel Co., Ltd. Inside the Kimitsu Steel Co., Ltd. (72) Inventor, Kazuyuki Kakiuchi 1 Kimitsu, Chiba Pref. Company Kimitsu Works (72) Inventor, Yuzuru Ikezaki, 46, Nakahara, Tobata-ku, Kitakyushu, Fukuoka Prefecture 59, Nippon Steel Plant Design Co., Ltd.

Claims (1)

[Claims] 1. A method for injecting powder of fuel, ore or the like from a tuyere of a blast furnace, in which two blowing transportation lines provided for each tuyere of the blast furnace are provided, and the respective transportation lines are mixed by a mixer. Then, a large amount of powder or a plurality of types of powder are blown into each tuyere by one burner, and the powder is blown into the tuyere of the blast furnace.