JPH06172838A - Equipment for blowing powdery material and its branched joint - Google Patents

Abstract

PURPOSE:To blow almost equal quantity of fine coal into a blast furnace from each transport pipe of the pulverized coal blowing equipment. CONSTITUTION:A two-branched joint 8 is connected with the other end side of the transport main pipe 7 connected with a powdery material segmenting joint 4 arranged at the lower part of the powdery material press-feeding tank 2 through a powdery material supplying pipe 3. A branched transport pipe 10 having short circuit parts 10a, 10a at the branched part side of the two-branched joint 8 and communicated with a blasting branched pipe 12a of a blast furnace 12 is connected thereto and a short circuit pipe 11 is interposed between the short circuit parts 10a, 10a and, on the other way, the short circuit pipe 11a is interposed between the short circuit parts 10a in the branched transport pipes 10 at the outermost side. By communicating each branched transport pipe 10 through the short circuit pipes 11, 11a, the solid-gas mixed fluid is flowed from high pressure side to low pressure side, and pressure loss deviation and equal distributing deviation of the solid-gas mixed fluid generated at the branched part in the two branched joint 8 are corrected. Therefore, almost the equal quantity of the fine coal from each branched transport pipe 10 can be blown into the blast furnace 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of powder blowing equipment and a branch joint thereof, and more specifically, a branch transport pipe in which pulverized coal which is powder supplied from a powder pressure feeding tank is branched. The present invention relates to a powder blowing facility and a branch joint thereof so as to enable uniform blowing from each of the above.

[0002]

2. Description of the Related Art Equipment for blowing powder such as iron ore, coal powder, and pulverized coal into a shaft furnace, for example, a pulverized coal blowing facility for a blast furnace, which has a relatively large number of blowing piping lines, is equipped with a splitter. It is devised so that the number of piping lines on the pulverized coal supplier side can be reduced by using the so-called two-branch joint. In other words, the two-branch joint used in such a pulverized coal blowing equipment is, as shown in FIG. 5 of the conceptual diagram of the pulverized coal blowing equipment, from the intermediate tank 50 to the powder pressure feed tank 51, the powder supply pipe 52,
The powder cut-out joint 53 and the powder feed joint 54 on the powder supply side, which is connected to the powder cut-out joint 53, are interposed. As the number of the two-branch joint 55 increases, The number of powder supply pipes 52 connected to the outlet 51a of the powder pressure feed tank 51 can be small, and there is an advantage that the number of flow meters, flow rate control valves, and the like can be reduced.

On the other hand, the equal distribution deviation of the powder in the branch portion of the two-branch joint 55 has a drawback that it becomes unstable and becomes larger as the number of the two-branch joint 55 is increased. When the powder is blown into the shaft furnace (not shown), the powder is supplied with the dilution gas from the dilution gas supply pipe 56 and the powder cutting joint 53.
Are mixed in the transport pipes 54, 54a in a solid-gas mixed flow state.
It is pumped via 54b. Two-way joint 55
It is extremely difficult to divide the two-branch joint 55 into two equal parts in terms of quality and uniformity of manufacturing. Branched transport pipes 54, 5 leading from the two-branch joint 55 to each of the inlets
Even if the pressure loss deviations of 4a and 54b are designed to be small, in reality, each of the transport pipes 54, 54a,
There is also a dimensional tolerance in the piping material of 54b, which is not always what the design intended.

The distribution deviation of the powder in the two-branch joint 55 and the pressure loss deviation of the branched transport pipes 54, 54a, 54b cause a deviation in the amount of powder blown into the transport pipes 54, 54a, 54b. If it is generated and its deviation value is large, it is not preferable for stable operation of the shaft furnace. As a means for solving such a problem, for example, as shown in FIG. 6a of the conceptual diagram of the pulverized coal blowing equipment, a two-branch joint 55 is used.
An expensive powder flow meter, a flow rate control valve, etc. are respectively installed in each of the transport pipes 54 branched through the, and complicated control is performed to remove the powder from each of the branched transport pipes 54. The deviation of the blowing amount is kept below a certain value.

[0005]

In the two-branch joint, in addition to the fact that the homogeneity of the material, the processing accuracy, the shape accuracy, etc. have a limit in the equal distribution property of the powder, in addition to the start of the powder injection. At the same time, abrasion occurs along with the passage and branching of the powder. Due to wear of the two-branch joint, we cannot expect to maintain equal distribution,
Rather, abrasion tends to promote uneven wear and deteriorate the equal distribution of the powder. Therefore, there is a potential problem to be solved in that the equal distribution of the powder by the two-branch joint cannot be completely controlled by those who design or operate.

Therefore, when the number of powder supply pipes is reduced by using the above-mentioned two-branch joint, in order to reduce the pressure loss deviation of the transport pipe between the two-branch joint and the blow destination, the main of pulverized coal blowing equipment is reduced. As shown in FIG. 6b of the conceptual diagram showing the parts, each transport pipe 54 is provided with a flow meter 56 and a flow rate control valve 57, and as shown in the conceptual diagram of FIG. Output signals from the flowmeters 56 and 56a provided in each of the transport pipes 54 are input to the control device 58, and the control device 58 receives the output signals.
The actuator 59 is operated by the
It is necessary to control the flow rate by changing the opening of 5.
There was no choice but to be economically disadvantageous with regard to powder injection equipment. In other words, the pulverized coal blowing equipment has a simple structure and is easy to handle, and each of the branched transport pipes 5
It is preferable that an equal amount of pulverized coal can be blown from each of the Nos. 4 into a blast furnace branch pipe (not shown) of the blast furnace.

Therefore, it is an object of the present invention to reduce the number of powder blowing lines, reduce the deviation of the blowing amount between the blowing lines, and make the arrangement simple and economical. To provide equipment and its branch joint.

[0008]

DISCLOSURE OF THE INVENTION In view of the above situation, the present invention provides a distribution of a solid-gas mixture fluid having a large pressure loss from a side having a small pressure loss and a large distribution amount of the solid-gas mixture fluid among the respective transport pipes. If the solid-gas mixture fluid is made to flow into the side with a small amount, even if the branch joint has a low function that causes pressure loss deviation or distribution deviation in the branch joint, the solid-gas mixture flowing in the downstream side of this branch joint This is because it is possible to surely correct the pressure drop deviation and the distribution deviation of the fluid.

Therefore, the feature of the main means adopted in the powder blowing equipment according to claim 1 of the present invention is that the powder feeding pipe connected to the lower portion of the distribution pressure feeding tank is provided with the powder feeding pipe. A powder cutting joint is provided in which a diluent gas supply pipe for supplying a diluent gas for diluting the powder supplied from is connected, and from the anti-communication side of the diluent gas supply pipe of the powder cutting joint, In a powder blowing facility that is provided with a powder transport pipe that branches at each branch joint and communicates with a powder blowing destination, a short-circuit port is provided on each of the branch joints on the downstream side, This is a structure in which a short-circuit pipe is interposed between each short-circuit port.

Further, the feature of the main means adopted by the branch joint of the powder injection equipment according to claim 2 of the present invention is that the powder supply pipe connected to the lower part of the distribution pressure feed tank is connected to the powder supply pipe. A powder cutout joint is provided in which a diluent gas supply pipe for supplying a diluent gas for diluting the powder supplied from the body supply pipe is in communication, and the anti-communication side of the dilution gas supply pipe is connected to the powder injection destination. In the branch joint of the powder blowing equipment interposed in the communicating powder transport pipe, short-circuit ports to which short-circuit pipes are respectively connected are provided downstream of the branch portions of the branch joint.

[0011]

According to the powder blowing equipment of the first aspect of the present invention, the powder blowing equipment is provided with a powder transport pipe which branches at every branch joint and communicates with the powder blowing destination. Since the short-circuit ports are provided on the downstream side of the branch portion of the branch joint, and the short-circuit pipe is interposed between these short-circuit ports, the solid-gas mixture fluid branched at the branch portion of the branch joint has a pressure loss deviation or a distribution deviation. When it occurs, the solid-gas mixture fluid flows from the side with less pressure loss and higher pressure to the side with larger pressure loss and lower pressure through the short-circuit pipe.

Further, according to the branch joint of the powder blowing facility according to the second aspect of the present invention, the branch portion of the branch coupling is provided in the powder transport pipe communicating with the powder blowing destination of the powder blowing facility. Since the short-circuit ports to which the short-circuit pipes are respectively connected are provided on the downstream side of, the short-circuit pipes are connected to this short-circuit port, so that the solid-gas mixture fluid branched at the branch portion of the branch joint has pressure loss deviation and distribution deviation. When it occurs, the solid-gas mixture fluid can flow from the side with less pressure loss and higher pressure to the side with more pressure loss and lower pressure through the short-circuit pipe.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The powder injection equipment according to the first embodiment of the present invention will be described below with reference to FIG. 1 which is a conceptual diagram of the powder coal injection equipment as an example. An intermediate tank 1 is provided, and a powder pressure feeding tank 2 is disposed below the intermediate tank 1, and an outlet 2a at a lower portion of the powder pressure feeding tank 2 has a powder cutting joint 4 at a lower portion. Is connected to the upper end of the powder supply pipe 3.
Further, on one end side of the powder cutting joint 4, that is, on the left side in the figure, a diluent gas for mixing pulverized coal which is powder supplied from the powder supply pipe 3 to the powder cutting joint 4 is provided. The dilution gas supply pipe 5 to be supplied is in communication with the dilution gas supply pipe 5
A powder transportation line 6 having a configuration described later is arranged on the side opposite to the connection.

The powder transport line 6 has three lines arranged side by side. However, as can be seen from the figure, all of them have the same structure. Two-branch joint 8 which is a bifurcated branch joint on the other end side of the transport source pipe 7 whose one end side is connected to the powder cutting joint 4
Is connected, one end side is connected to the branch part side of the two-branch joint 8, and the other end sides of the branch transport pipes 10, 10 that communicate with each other via flexible hoses 9, 9 are blast branch pipes of the blast furnace 12 to which the pulverized coal is injected. 12a. Furthermore, the flexible hoses 9 and 9 of these branch transportation pipes 10 and 10
The short-circuit ports 10a, 10 closer to the two-branch joint 8 side than
a is provided, and the short-circuit pipe 11 is interposed therebetween, and the short-circuit pipe 11a is interposed between the short-circuit ports 10a, 10a of the outermost branch transport pipes 10, 10. The branch transport pipes 10 are configured to communicate with each other by the short-circuit pipes 11 and 11a.

The operation mode of the pulverized coal blowing equipment having the above-mentioned structure will be described below. Powder such as pulverized coal supplied from the powder pressure feed tank 2 through the powder supply pipe 3 and the dilution gas supply pipe 5. The diluent gas supplied from the above is mixed in the powder cutting joint 4 and becomes a solid-gas mixed fluid, which flows through the transport source pipe 7,
Next, it is branched at the branch portion of the two-branch joint 8 and flows through the branch transport pipes 10 and 10, respectively, and is blown into the blower branch pipe 12a of the blast furnace 12. However, in this two-branch joint 8, naturally,
Since pressure drop deviation and distribution deviation occur, branch transport pipes 10, 1
A difference occurs in the pressure and amount of the solid-gas mixture fluid flowing through 0.

However, these branch transport pipes 10, 1
0 communicates with each other through the short-circuit pipes 11 and 11a, and the solid-gas mixed fluid flows from the side where the pressure loss is small and the pressure of the solid-gas mixed fluid is high to the side where the pressure loss is large and the pressure of the solid-gas mixed fluid is low. Therefore, the pressure and amount of the solid-gas mixture fluid in the branch transportation pipes 10, 10 are corrected. In this way, even if the two-branch joint 8 has a pressure loss deviation or a distribution deviation, the short-circuit pipe 1
1, 11a by the branch transport pipe 1 on the downstream side of the two-branch joint 8
Since the pressure and the distribution amount of the solid-gas mixture fluid flowing through 0 and 10 are corrected to be equal, approximately the same amount of pulverized coal is distributed from each of the branch transportation pipes 10 and 10 to the blast furnace branch pipe (not shown). Be blown in.

Therefore, according to the pulverized coal blowing equipment of this embodiment, as in the conventional case, an expensive flow meter or flow control valve is provided in each transportation pipe, or the output of the flow meter is input. It is not necessary to perform difficult control such as adjusting the opening degree of the flow control valve by the control device, and further, the homogeneity of the material of the two-branch joint, the processing accuracy, the shape accuracy, etc., and the degree of uneven wear due to wear and tear. Regardless of this, the solid-gas mixture fluid consisting of pulverized coal and diluent gas is evenly distributed,
The structure of the pulverized coal blowing facility is simplified, which is extremely advantageous in terms of the cost of this blowing facility.

Next, the pulverized coal blowing equipment according to the second embodiment of the present invention is the same as that of the first embodiment and has the same function as that of the first embodiment with reference to FIG. Only the points of difference in construction will be described with reference to the reference numerals. As will be understood from the figure, two short-circuit ports 8a and two short-circuit ports 8a,
8a is provided, and the short-circuit pipe 11 is interposed between the short-circuit ports 8a, 8a provided on the opposite sides of the bifurcated branch portion, and the bifurcated branch of the short-circuit port 8a provided on the opposite side and another two-branch joint 8 is provided. The short-circuit pipes 11 are also respectively provided between the short-circuit ports 8a provided in the above-mentioned section, and the short-circuit pipes 11 communicate with each other.

Therefore, since the bifurcated branch portions on the downstream side of the branch portion of the branch joint 8 communicate with each other through the short-circuit pipe 11, the pressure loss is small and the pressure loss of the solid-gas mixture fluid is high and the pressure loss is large. Since the solid-gas mixture fluid flows into the side where the pressure of the solid-gas mixture fluid is low, the branch transport pipe 1 connected to the bifurcated portion
Since the pressure and the distribution amount of the solid-gas mixture fluid of 0 and 10 are corrected, this embodiment has the same effect as the first embodiment.

Next, regarding the pulverized coal blowing equipment according to the third embodiment of the present invention, referring to FIG. 3 of the conceptual diagram, the same components as those of the first embodiment and those having the same functions are designated by the same reference numerals. Only the differences in structure will be described. This is, as will be understood well from the figure, that the two-branch joint 8 is provided on the other end side of the transport source pipe 7 whose one end side is connected to the powder cutting joint 4.
Is connected to the branch portion side of the two-branch joint 8, a short-circuit pipe 11 is interposed between the short-circuit ports 10a, and the branch transport pipes 10, 1 communicating with each other via the short-circuit pipe 11 are connected.
One end side of 0 is connected and these branch transport pipes 1
Second branch joint 1 on each of the other ends of 0 and 10
3, 13 are connected.

Then, each of the two branch joints 13, 13 on the branch side is connected to a blast furnace blast branch pipe (not shown), and the second-stage powder transport line 14 has a structure described later.
Was arranged. That is, this second-stage powder transportation line 14
Has two second-stage short-circuit ports 15a, and the opposite-side short-circuit ports 15a are in the second-stage relation between the opposite-side short-circuit ports 15a and the adjacent short-circuit ports 15a. The short circuit tube 16 communicates with each other, and the outermost short circuit ports 15a communicate with each other through the short circuit tube 17 2
The transportation pipe 15 of the stage is provided.

Further, the transport pipes 15 are connected to the blast branch pipes of the blast furnace through the second-stage flexible hoses 18, respectively. In short, the transportation line 14 according to this embodiment has a configuration in which the transportation line 6 according to the first embodiment is branched once, whereas the transportation line 6 according to the first embodiment is branched twice. Only the number of steps is different.

Therefore, the branch transport pipe 10 on the downstream side of the two-branch joint 8 is connected by the short-circuit pipe 11, and the second-stage transport pipe 15 on the downstream side of the second-branch joint 13 is connected to the short-circuit pipe 1.
6 and 17, the pressure drop deviation and distribution deviation of the powder by the two-branch joint 8 are corrected by the short-circuit pipe 11, while the pressure drop deviation and the distribution deviation of the powder by the second-stage two-branch joint 13 are corrected. Since this is corrected by the short-circuit tubes 16 and 17, this embodiment has the same effect as the first embodiment. It is also possible to use a two-branch joint having a short circuit port as described in the second embodiment.

Next, the pulverized coal blowing equipment according to the fourth embodiment of the present invention will be described with reference to FIG. 4 which is a conceptual diagram showing the main part of the pulverized coal blowing equipment, only in respect of differences in construction from the third embodiment. As can be understood from the figure, this is the second stage transportation of each second stage powder transportation line 14 connected to each of the forked branches of the second stage two-branch joints 13, 13. The short-circuit ports 15a on opposite sides of the pipe 15 are connected by the short-circuit pipe 16, while the short-circuit pipe 16 and the short-circuit pipe 17 for connecting the outermost short-circuit ports 15a are connected to each other by a communication pipe 19.
It is configured to communicate with each other.

Therefore, the second-stage transport pipe 15 on the downstream side of the two-branch joint 13 is connected by the short-circuit pipes 16 and 17, and the pressure loss deviation and distribution deviation of the powder caused by the two-branch joint 13 are eliminated. Since it is corrected by the short-circuit tubes 16 and 17,
This embodiment has the same effect as the above-mentioned third embodiment. Of course, this embodiment can also use the two-branch joint having the short-circuit port as described in the second embodiment. It should be noted that each of the embodiments described in detail above is merely a specific example of the present invention, and therefore, design changes and the like can be freely made without departing from the technical idea of the present invention.

[0026]

As described in detail above, the first aspect of the present invention
According to the powder blowing equipment and the branch joint thereof according to (1) and (2), the solid-gas mixture fluid flowing on the downstream side of the branch joint is caused by the homogeneity of the material of the branch joint, the processing accuracy, the shape accuracy, etc.
Although pressure loss deviation and distribution deviation occur, the solid-gas mixture fluid flows from the side with low pressure loss and high pressure to the side with high pressure loss and low pressure through the short-circuit pipe and flows downstream of this branch joint. Since the pressure drop deviation and distribution deviation of the solid-gas mixture fluid are corrected, it is possible to supply almost the same amount of powder to the blow-in side, and it is possible to use expensive flow meters and flow control valves as in the past. As a result of eliminating the need for mounting or difficult flow rate control, it becomes possible to simplify the powder blowing equipment, and there is a great effect in reducing the powder blowing equipment cost.

[Brief description of drawings]

FIG. 1 is a conceptual diagram of a pulverized coal blowing facility according to a first embodiment of the present invention.

FIG. 2 is a conceptual diagram of a main part of a pulverized coal blowing facility according to a second embodiment of the present invention.

FIG. 3 is a conceptual diagram of pulverized coal blowing equipment according to a third embodiment of the present invention.

FIG. 4 is a conceptual diagram showing a main part of a pulverized coal blowing facility according to a fourth embodiment of the present invention.

FIG. 5 is a conceptual diagram of a pulverized coal blowing facility according to a first conventional example.

FIG. 6a is a conceptual diagram of a pulverized coal blowing equipment according to a second conventional example, FIG. 6b is a conceptual diagram showing a main part of the pulverized coal blowing equipment according to a third conventional example, and FIG. 6c is a fourth conventional example. It is a conceptual diagram which shows the principal part of this pulverized coal blowing equipment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Intermediate tank 2 ... Powder pressure feed tank, 2a ... Exit 3 ... Powder supply pipe 4 ... Powder cutting joint 5 ... Diluting gas supply pipe 6 ... Powder transportation line 7 ... Transport source pipe 8 ... Two-branch joint, 8a ... Short-circuit port 9 ... Flexible hose 10 ... Branch transport pipe, 10a ... Short-circuit port 11 ... Short-circuit pipe, 11a ... Short-circuit pipe 12 ... Blast furnace, 12a ... Blower branch pipe 13 ... Second branch joint 14 ... Second stage Transport line 15 ... Second stage transport pipe, 15a ... Second stage short-circuit port 16,17 ... Second stage short-circuit pipe 18 ... Second stage flexible hose 19 ... Communication pipe

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kaoru Tatehara 1-3-18 Wakihama-cho, Chuo-ku, Kobe-shi, Hyogo Kobe Steel Works, Kobe Head Office (72) Inventor Koichi Kimijima Wakihama, Chuo-ku, Kobe-shi, Hyogo 1-Chome, 3-18, Kobe Steel Co., Ltd. Kobe Head Office (72) Inventor Satoshi Funabiki 1 Kanazawa-machi, Kakogawa City, Hyogo Prefecture Kadoto Steel Works Co., Ltd. Kakogawa Steel Works (72) Inventor Yoshihiro Yamamoto Kobe City, Hyogo Prefecture 1-318 Wakihama-cho, Chuo-ku Kobe Steel Works, Ltd. Kobe Head Office

Claims (2)

[Claims] 1. A powder in which a diluent gas supply pipe for supplying a diluent gas for diluting the powder supplied from the powder supply pipe communicates with the powder supply pipe connected to the lower portion of the distribution pressure feed tank. A body transport joint is provided, and a powder transport pipe that branches from the anti-communication side of the dilution gas supply pipe of the powder transport joint at each branch joint and communicates with the powder blowing destination. In the powder blowing equipment provided, a powder blowing equipment characterized in that a short-circuit port is provided on a downstream side of each of the branch portions of the branch joint, and a short-circuit pipe is interposed between the respective short-circuit ports. 2. A powder which is connected to a powder supply pipe connected to a lower portion of a distribution pressure-feeding tank and a diluent gas supply pipe for supplying a diluent gas for diluting the powder supplied from the powder supply pipe. In a branch joint of a powder injection equipment, which is provided with a body cutout joint, and which is interposed in a powder transport pipe communicating from a non-communication side of the dilution gas supply pipe to a powder injection destination, a branch portion of the branch joint A branch joint for powder injection equipment, characterized in that a short-circuit port to which a short-circuit pipe is connected is provided on each of the downstream sides.