JP2005240089A - Method and apparatus for injecting pulverized fine coal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a method and apparatus for injecting pulverized fine coal with which even in the case of simultaneously injecting the pulverized fine coal and waste plastics through a part among the plurality of tuyeres, uniform combustion can be obtained in the whole used tuyeres without developing the shortage of oxygen in these tuyeres. <P>SOLUTION: In the method for injecting the pulverized fine coal, by which the pulverized fine coal flowing carried with pneumatic transportation is divided with the plurality of branch pipes 11 with a divider 9 and the divided pulverized fine coal making flow of a part of the branch pipe 11a, is injected into a blast furnace 2 as it is, and the pulverized fine coal making flow of the remaining branch pipe 11a is injected into the blast furnace 2 by colliding against powdery or fine piece synthetic resin material, resistant means 13, 19 as the resistance of the gas-flowing are arranged at the downstream side of the divider 9 in the remaining branch pipe 11a and the pulverized fine coal amount making flow of this branch pipe 11a is made to be less than the pulverized fine coal amount making flow of the branch pipe 11b injecting only the pulverized fine coal. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a technique for injecting auxiliary fuel into a furnace of a blast furnace, and relates to a technique for simultaneously injecting pulverized coal and granular or flaky synthetic resin material.

In blast furnace operation, pulverized coal injection blast furnace operation is performed in which pulverized coal is injected from a blast furnace tuyere instead of a part of coke as fuel. The operation of injecting pulverized coal into the blast furnace provides a significant cost reduction effect because pulverized coal is less expensive than blast furnace coke. In addition, by increasing the amount of pulverized coal injected into the blast furnace, it is possible to reduce the load on the coke oven, which is a blast furnace coke manufacturing facility, and contribute to the extension of the life of the coke oven.
Therefore, in blast furnace operation, the development of operation technology for injecting a larger amount of pulverized coal has been requested, and at present, a large amount of pulverized coal injection operation of 120 kg / T or more is being performed.

In recent years, the used plastic has been crushed or granulated (hereinafter referred to as “waste plastic” in this specification) mainly for the purpose of solving the processing problem of used plastic discharged in large quantities. Technology has been developed to inject from the tuyere with pulverized coal as auxiliary fuel.
As a problem when blowing waste plastic from the tuyere, although the waste plastic is crushed or granulated, its particle size is larger than pulverized coal and its ignitability is poor. Intrusion and accumulation from the raceway into the blast furnace may impede air permeability in the furnace and deteriorate the productivity of the blast furnace.

  In order to solve such problems, waste plastic is blown from a waste plastic blowing lance installed through the blower branch of the tuyere, and 50 to 500 mm in the blowing direction of the blower branch from the waste plastic blowing position. By blowing pulverized coal from a pulverized coal blowing lance installed in front (upstream side), and blowing waste plastic into a temperature field of a high temperature atmosphere of 1500 to 2000 ° C. formed by preceding combustion of pulverized coal, waste plastic There is one that promotes combustion (see Prior Literature 1).

  As another prior art, pulverized coal and plastic powder are cut out from each supply hopper and mixed, and the mixed powder is conveyed to the distributor by air and distributed to several tens of tuyere by the distributor. Then, there is a method of blowing into the furnace through the tuyere from the nozzle inserted into the blower branch pipe (refer to the prior art document 2).

However, since the thing of the prior art document 1 takes the process of burning pulverized coal first, heating blowing air with the combustion heat, and then heating waste plastic with the heated air, heating of waste plastic is indirect. Therefore, a big effect cannot be expected.
Further, in the method of Prior Art 2, when the transport speed of particles in the transport pipe after the mixed powder distributor is the same for waste plastic and pulverized coal, the waste plastic and pulverized coal particles are separated and the tuyere Therefore, the effect of giving the combustion heat of the pulverized coal to the waste plastic is not obtained, and the sufficient effect of improving the combustibility of the waste plastic is not seen.

For this reason, if the combustion heat of pulverized coal can be directly applied to the waste plastic particles, the idea is that the effect will be further improved. A method has been proposed in which the mixed fluids that have been transported in the gas are joined together, and the resultant fluid obtained is injected from the auxiliary fuel blowing lance and blown into the furnace of the blast furnace (refer to Reference 3). .
JP-A-8-260007 JP 7-228905 A JP 2002-146416 A

Certainly, according to the method of the prior art document 3, since the pulverized coal adheres to the waste plastic and is blown in, the combustion heat of the pulverized coal can be directly applied to the waste plastic, and the improvement effect of the combustibility of the waste plastic is expected. it can.
However, in actual operation, pulverized coal and waste plastics are not always blown into all the dozens of tuyere.
For example, 26 of the 34 tuyere may be blown with only pulverized coal, and the remaining 8 may be blown with pulverized coal and waste plastic simultaneously. In such a case, an approximately equal amount of pulverized coal distributed by the distributor flows into the branch pipe communicating with the tuyere of 34, but when pulverized coal and waste plastic are simultaneously blown for some of them, There is a problem that the tuyere that performs simultaneous blowing has a shortage of oxygen and the combustibility becomes worse compared to the tuyeres with only pulverized coal. In other words, although pulverized coal is attached to waste plastic to improve the ignitability of waste plastic with poor ignitability, oxygen is consumed by the combustion of pulverized coal and the waste plastic cannot be burned. There is a problem. Here, it is conceivable to increase the oxygen enrichment rate, but increasing the oxygen enrichment rate increases the tuyere temperature, and in normal operations where the tuyere temperature is operating at the limit value, oxygen enrichment The current situation is that the rate cannot be increased.
That is, an object of the present invention is to reduce the total amount of pulverized coal without reducing the total amount of pulverized coal in the operation of pulverized coal injection in which only pulverized coal and pulverized coal and synthetic resin material are mixed. In order to improve the combustibility in simultaneous blowing of pulverized coal and synthetic resin material without increasing the conversion rate, it is necessary to realize uniform combustion in all tuyere.

  The present invention has been made to solve such a problem, and even when pulverized coal and waste plastic are simultaneously blown into a part of a plurality of tuyere, oxygen deficiency at the tuyere is present. An object is to obtain a method and an apparatus for simultaneously blowing pulverized coal and a synthetic resin material that can be uniformly burned in all tuyere without occurring.

(1) In the pulverized coal injection method according to the present invention, the pulverized coal powder flow transported by airflow is branched into a plurality of branch pipes by a distributor, and the pulverized coal flowing through a part of the branched branch pipes is directly supplied to the blast furnace. The pulverized coal flowing through the remaining branch pipe is blown into the blast furnace by colliding with the powdered or flake-shaped synthetic resin material, and the pulverized coal flowing into the blast furnace flows. The pipe is provided with airflow resistance so that the amount of pulverized coal flowing through the branch pipe is less than the amount of pulverized coal flowing through the branch pipe where only the pulverized coal is blown.

(2) Further, the airflow resistance in (1) is characterized in that the airflow resistance is applied by blowing a gas in a direction that becomes the resistance of the airflow flowing through the branch pipe.

(3) In addition, the airflow resistance in (1) above is provided by both narrowing down the diameter of the branch pipe and blowing gas in a direction that causes resistance of the airflow flowing through the branch pipe. It is.

(4) Moreover, in what is described in said (1)-(3), the amount of pulverized coal which flows through the branch pipe used as injection of only pulverized coal, and the branch pipe used as injection of pulverized coal and a synthetic resin material are provided. The airflow resistance is provided so that the amount of pulverized coal flowing and the total amount of the synthetic resin material are substantially equal.

(5) Moreover, the pulverized coal blowing apparatus according to the present invention branches the pulverized coal powder flow transported by airflow into a plurality of branch pipes by a distributor, and the pulverized coal flowing through a part of the branched branches is left as it is. The pulverized coal that blows into the blast furnace and flows through the remaining branch pipe is a pulverized coal blowing device that collides with a granular or strip-shaped synthetic resin material and blows into the blast furnace, and the pulverized coal that collides with the synthetic resin material flows It is provided with resistance means for giving airflow resistance to the branch pipe.

(6) Moreover, the resistance means as described in said (5) is a gas injection apparatus which injects gas in the direction which becomes resistance to the pulverized coal powder flow which flows through a branch pipe.

(7) Further, in the above-described (6), a reduced diameter pipe for narrowing the pipe diameter is provided in the middle of the branch pipe.

(8) Further, in the above (6) or (7), the gas injection device is characterized in that either or both of the gas flow rate and the flow velocity can be adjusted.

  In the present invention, the pulverized coal powder stream transported by airflow is branched into a plurality of branch pipes by a distributor, and the pulverized coal flowing through the branched branch pipes is directly blown into the blast furnace and flows through the remaining branch pipes. The pulverized coal is a method in which the pulverized coal is blown into a blast furnace by colliding with a synthetic resin material, and by adding airflow resistance to the remaining branch pipe, the amount of pulverized coal flowing through the branch pipe becomes a blow of only pulverized coal The amount of pulverized coal flowing through the pipe is reduced, and the amount of fuel flowing through each branch pipe is averaged to improve the combustibility of the synthetic resin material.

  FIG. 1 is an explanatory view of an embodiment of the present invention, and is an overall explanatory view of a method and apparatus for blowing pulverized coal and a synthetic resin material from a tuyere 4 of a blast furnace 2. FIG. 2 shows a part of FIG. It is detailed explanatory drawing demonstrated. The apparatus configuration and operation of this embodiment will be described below with reference to FIGS.

<Description of device configuration>
The apparatus in the present embodiment includes a pulverized coal storage tank 1 that stores pulverized coal, and a pulverized coal injection device 3 that cuts the pulverized coal stored in the pulverized coal storage tank 1 into a pulverized coal transport pipe 7 by a predetermined amount. I have. The pulverized coal transport pipe 7 is provided with a compressed nitrogen supply device 5 for supplying nitrogen gas for air-transporting the cut pulverized coal, and the pulverized coal is discharged by the nitrogen gas ejected from the compressed nitrogen supply device 5. The pulverized coal transport pipe 7 is air-transported toward the tuyere side. The pulverized coal transport pipe 7 is distributed on the way to the pulverized coal branch pipes 11 of the same number as the number of tuyere (34 in this example) by the distributor 9. Eight of the distributed pulverized coal branch pipes 11 (with reference numeral 11a in the figure) join with a waste plastic transport pipe 39, which will be described later, and are connected to a pulverization blowing lance 23. The pulverized coal branch pipe 11a is connected with a flow rate control pipe 13 for blowing nitrogen gas for flow rate control from a direction orthogonal to the flow of the air flow. The flow rate control pipe 13 blows nitrogen gas into the flow rate control pipe 13. A compressed nitrogen supply device 15 is provided. A ceramic coating is applied to the inner surface of the connecting portion 17 of the flow control pipe 13 in the pulverized coal branch pipe 11a to prevent wear.

In the pulverized coal branch pipe 11a, on the downstream side of the connection portion of the flow control pipe 13, a reduced diameter portion 19 is provided for reducing the pipe diameter of the pulverized coal branch pipe 11a to provide flow resistance. In the present embodiment, the nitrogen gas injected from the reduced diameter portion 19 and the flow rate control pipe 13 serves as resistance means that serves as resistance of the airflow flowing through the pulverized coal branch pipe 11a.
A waste plastic transport pipe 39, which will be described later, is connected to the downstream side of the reduced diameter portion 19 in the pulverized coal branch pipe 11a. At the tip of the granular material transport tube 21, a granular material blowing lance 23 is provided. As shown in FIG. 2, the lance 23 for blowing the granular material has a tip (injection port) located inside the hot air blowing branch 25 or the inside of the tuyere 4, and the tip of the tuyere 4 (furnace) It is installed so as to be in a position before (upstream side) than the inner tip.

It is preferable that the distance from the junction 29 of the pulverized coal branch pipe 11a and the waste plastic transport pipe 39 to the tip (exit) of the pulverized powder blowing lance 23 is as short as possible. This is because pulverized coal adheres to the surface of the waste plastic after the junction 29, but the adhered pulverized coal is ejected from the granular material blowing lance 23 before it is detached from the surface of the waste plastic. This is because a shorter distance is preferable.
The remaining 26 pulverized coal branch pipes 11b branched by the distributor 9 are piped to the vicinity of the tuyere without joining the waste plastic transport pipe 39, and a pulverized coal blowing lance 31 is attached to the tip of the pipe. Installed in the mouth.

The waste plastic storage tank 33 stores waste plastic having a diameter (length) of about 10 mm or less by crushing or granulating industrial waste such as containers such as PET bottles and packaging materials. A waste plastic blowing tank 35 is installed below the waste plastic storage tank 33, and a waste plastic transport pipe 39 serving as a transport path for the waste plastic is connected to the tank 35. Further, the waste plastic storage tank 33 is provided with a compressed air supply device 37 for supplying air as a transport gas for sending the waste plastic in the tank to the waste plastic transport pipe 39 for transport.
As described above, the waste plastic transport pipe 39 and the pulverized coal branch pipe 11a are connected at a predetermined angle θ in the middle to become the powder transport pipe 21 and are connected to the powder blowing lance 23.

<Description of operation>
In the present embodiment configured as described above, a predetermined amount of pulverized coal stored in the pulverized coal storage tank 1 is cut out to the pulverized coal transport pipe 7 by the pulverized coal injection device 3. The cut out pulverized coal is air-flowed toward the tuyere side through the pulverized coal transport pipe 7 by the nitrogen gas ejected from the compressed nitrogen supply device 5 and is carried to the distributor 9.
The pulverized coal transported by airflow is distributed to 34 pulverized coal branch pipes 11 by a distributor 9. At this time, in the eight pulverized coal branch pipes 11a, nitrogen gas for flow control is injected from the flow control pipe 13 in a direction orthogonal to the air flow, and a reduced diameter portion 19 is provided on the downstream side thereof. Therefore, the flow path resistance is increased. For this reason, it becomes difficult for the pulverized coal airflow to flow as compared with the remaining 26 pulverized coal branch pipes 11b, and the amount of pulverized coal distributed by the distributor 9 is reduced.

In other words, the pulverized coal transported by airflow is distributed by the distributor 9 to each of the eight pulverized coal branch pipes 11a and the 26 pulverized coal branch pipes 11b, and flows into the eight pulverized coal branch pipes 11a. Less than the pulverized coal branch pipe 11b group is distributed by the road resistance.
The magnitude of the resistance value can be appropriately changed by changing the flow rate and flow rate of the nitrogen gas for flow rate control injected from the flow rate control tube 13. However, if the flow rate of the nitrogen gas for flow rate control exceeds a predetermined amount, the amount of pulverized coal cannot be reduced even if the flow rate is increased further. This point is explained in the graph shown in FIG. 3, where the vertical axis shows the amount of pulverized coal flowing in the pulverized coal branch pipe 11 a (ratio to the amount of pulverized coal flowing in the pulverized coal branch pipe 11 b), The horizontal axis indicates the flow rate of the nitrogen gas for flow rate control injected from the flow rate control tube 13.

As shown in the graph of FIG. 3, in this example, the amount of pulverized coal flowing through the pulverized coal branch pipe 11a as the amount of nitrogen gas is increased until the amount of nitrogen gas reaches 30 Nm ^3. However, if it exceeds 30 Nm ³ , the amount of pulverized coal cannot be reduced even if the amount of nitrogen gas is increased further. Therefore, in order to further reduce the amount of pulverized coal flowing through the pulverized coal branch pipe 11a, it is preferable to provide a reduced diameter portion 19 as another resistance means as in this embodiment.

  The most preferable resistance value is the amount of pulverized coal flowing through each of the 26 pulverized coal branch pipes 11b and the amount of waste plastic to which this pulverized coal adheres to the amount of pulverized coal flowing through each of the eight pulverized coal branch pipes 11a. The resistance value is equal to the total amount added. By doing in this way, combustion is smoothly performed in the line where pulverized coal and waste plastics merge, and combustion in all tuyere is balanced. This point will be demonstrated in the examples described later.

  The pulverized coal distributed to the pulverized coal branch pipe 11 a collides with the waste plastic flowing through the waste plastic transport pipe 39 after the junction 29. When the pulverized coal and the waste plastic collide, the pulverized coal adheres to the surface of the waste plastic, and the pulverized coal and the waste plastic flow together through the granular material transport pipe 21. Thus, it is necessary for the pulverized coal and the waste plastic to collide with each other to improve the combustibility. However, in order for the two to collide after the junction 29, the pulverized coal and the waste plastic coexist. It is necessary that there is a difference in the flight speed of each particle inside the airflow. For this purpose, if the flight speeds of the two just before the junction 29 are different, the speed of the two also differs in the particulate transport pipe 21 after the junction 29, and the pulverized coal adheres to the surface of the waste plastic. To do. Therefore, the nitrogen flow rate from the compressed nitrogen supply devices 5 and 37 is set so that the flight speed of the pulverized coal flowing through the pulverized coal branch pipe 11a and the flight speed of the waste plastic flowing through the waste plastic transport pipe 39 are different.

Waste plastic to which pulverized coal adheres flows through the granular material transport pipe 21 toward the tuyere side, and is injected from the granular material blowing lance 23 into the hot air of the blower branch pipe 25. At this time, pulverized coal with good ignitability is quickly ignited, and then the combustion heat of the pulverized coal is quickly given to the waste plastic, and the waste plastic is ignited. Moreover, since the flow rate is controlled so that the amount of pulverized coal flowing through the pulverized coal branch pipe 11a is smaller than that of the pulverized coal branch pipe 11b, smooth combustion is realized without oxygen shortage during pulverized coal ignition.
In the following example, the effect of this embodiment is demonstrated by comparing with the case where the flow control to the pulverized coal branch pipe 11a joined to the waste plastic transport pipe 39 is not performed.

Table 1 summarizes the results of actual blowing with and without pulverized coal flow control. In this example, as shown in the embodiment, 26 of the 34 tuyere are only pulverized coal (indicated as “PC only” in the table), and the remaining 8 are waste plastic and pulverized coal. The mixed blowing ("Pura + PC" in the table). And the total blowing amount of pulverized coal is 55.42T / H, and this is distributed to 34 tuyere. The total amount of waste plastic blown is 4.8 T / H, which is distributed to 8 tuyere. In Table 1, the amount per tuyere is shown.
Further, the nitrogen gas for flow control from the flow control tube 13 as the resistance means is 30 Nm ³ , and the diameter of the reduced diameter portion 19 is reduced to φ7 where the branch pipe 11 a is φ8.

As can be seen from Table 1, when pulverized coal flow rate control is not performed, an equal amount (1.63 T / H) of pulverized coal flows through the “Pura + PC” line and the “PC only” line. Therefore, in the “Pura + PC” line, in addition to the pulverized coal, 0.6 T / H waste plastic is blown and 2.23 T / H fuel is blown. For this reason, in the “Pura + PC” line, the oxygen excess coefficient is as small as 0.68, and oxygen is insufficient to burn all the fuel. As a result, the waste plastic cannot be burned sufficiently and the tuyere temperature is as low as 1970 ° C. On the other hand, in the “PC only” line, the supplied fuel is only pulverized coal 1.63 T / H, the oxygen excess coefficient is 0.96, and almost complete combustion is possible. As a result, the tuyere temperature of the “PC only” line is 2194 ° C.
In this way, when the pulverized coal flow rate control is not performed, oxygen becomes insufficient in the “Pura + PC” line, the combustibility is deteriorated, and the tuyere temperature in the “Pura + PC” line and the “PC only” line is reduced. There are variations.

On the other hand, when pulverized coal flow rate control is performed, 1.18 T / H pulverized coal flows in the “Pura + PC” line, and 1.77 T / H pulverized coal flows in the “PC only” line. Yes. In this way, when the flow rate control is performed, the amount of pulverized coal flowing through the “Pura + PC” line decreases and the amount of pulverized coal flowing through the “PC only” line increases. since gave a flow resistance by the reduced tube with blowing N ₂ of "Plastic + PC" pulverized coal is reduced to flow in the line, the decrease is due to flow through the "PC only" line. As a result, the amount of fuel in the “Pura + PC” line is 1.78 T / H, which is 1.18 T / H of pulverized coal plus 0.6 T / H of waste plastic, and is compared to the amount of fuel when pulverized coal flow rate control is not performed. The amount of pulverized coal is reduced. Therefore, the oxygen excess coefficient is improved from 0.68 to 0.82 when the pulverized coal flow rate control is not performed. On the other hand, the oxygen excess coefficient of the “PC only” line is 0.84, which is lower than 0.96 when the pulverized coal flow rate control is not performed, but does not adversely affect the combustibility.
In addition, when pulverized coal flow rate control is performed, the tuyere temperature of the “Pura + PC” line is 2255 ° C., and the tuyere temperature of the “PC only” line is 2153 ° C., which is balanced. .

  As described above, by controlling the pulverized coal flow rate, the amount of pulverized coal flowing in the “Pura + PC” line can be distributed to the “PC only” line. As a result, the flammability of the “Pura + PC” line is large. It was proved that it was improved.

In the above embodiment, the flow rate of nitrogen gas blown from the flow rate control pipe 13 is used as the flow rate control means to the pulverized coal branch pipe 11a that joins the waste plastic transport pipe 39. Since the resistance value can be arbitrarily changed by appropriately changing the flow velocity, pulverized coal flow rate control according to various situations can be realized.
In the present embodiment, since nitrogen gas blowing from the flow rate control pipe 13 and the reduced diameter portion 19 are used in combination, a wide range of flow rate control is possible. However, if the flow rate control range is narrow due to the relationship with the amount of pulverized coal, etc., only nitrogen gas may be blown from the flow rate control pipe 13.

In the present embodiment, an example is shown in which nitrogen gas is injected from the flow rate control pipe 13 to the pulverized coal branch pipe 11a in a direction orthogonal to the pulverized coal branch pipe 11a. May be at least as long as the direction of resistance of the airflow flowing through the pulverized coal branch pipe 11a.
Further, by making it possible to change the injection angle of the flow rate control pipe 13, it is possible to change the resistance value without changing the amount of nitrogen gas, and it is possible to change the resistance value more delicately.

Moreover, in this Embodiment, the example which used nitrogen gas as gas for airflow transportation of pulverized coal, the gas for flow control injected to the pulverized coal branch pipe 11a, and waste plastic transportation gas was shown.
However, the present invention is not limited to this, and air may be used instead of nitrogen gas.

It is explanatory drawing of the pulverized coal blowing method and apparatus which concern on one Embodiment of this invention. FIG. 2 is a detailed explanatory diagram illustrating a part of FIG. 1 in detail. It is a graph explaining the relationship between the amount of nitrogen gas for flow control in one embodiment of the present invention, and the amount of pulverized coal flowing through a branch pipe.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pulverized coal storage tank 2 Blast furnace 3 Pulverized coal injection device 4 Tuyere 5, 37 Compressed nitrogen supply device 7 Pulverized coal transport pipe 9 Distributor 11 Pulverized coal branch pipe 13 Flow control pipe 19 Reduced diameter part 33 Waste plastic storage tank 35 Waste Plastic blowing tank

Claims (8)

The pulverized coal powder stream that is transported by airflow is branched into a plurality of branch pipes by a distributor, the pulverized coal flowing through a part of the branched branches is blown into the blast furnace as it is, and the pulverized coal flowing through the remaining branch pipes is granular. Or a pulverized coal injection method for impinging on a strip-shaped synthetic resin material and blowing it into a blast furnace,
An airflow resistance is applied to the branch pipe through which the pulverized coal that collides with the synthetic resin material flows, so that the amount of pulverized coal flowing through the branch pipe is less than the amount of pulverized coal flowing through the branch pipe where only the pulverized coal is blown. A method for injecting pulverized coal. The method of blowing pulverized coal according to claim 1, wherein the airflow resistance is applied by blowing gas in a direction that becomes resistance of the airflow flowing through the branch pipe. 2. The pulverized coal injecting method according to claim 1, wherein the air flow resistance is applied both by narrowing a diameter of the branch pipe and by blowing a gas in a direction that causes resistance of the air current flowing through the branch pipe. The amount of pulverized coal flowing through the branch pipe where only pulverized coal is blown, and the amount of pulverized coal flowing through the branch pipe where the pulverized coal and synthetic resin material are simultaneously blown, and the total amount of the synthetic resin material are almost equal. The pulverized coal blowing method according to claim 1, wherein a resistance value of the resistance means is set in The pulverized coal powder stream that is transported by air flow is branched into a plurality of branch pipes by a distributor, and the pulverized coal flowing through a part of the branched branches is blown into the blast furnace as it is, and the pulverized coal flowing through the remaining branch pipes is not granular A pulverized coal blowing device that collides with a piece of synthetic resin material and blows into a blast furnace,
A pulverized coal injecting apparatus comprising resistance means for providing airflow resistance to a branch pipe through which pulverized coal that collides with the synthetic resin material flows. 6. The pulverized coal injecting apparatus according to claim 5, wherein the resistance means is a gas injection device that injects gas in a direction that becomes resistance to the pulverized coal powder flow that flows through the branch pipe. The pulverized coal blowing device according to claim 6, wherein a reduced diameter pipe for narrowing the pipe diameter is provided in the middle of the branch pipe. The pulverized coal injection device according to claim 6 or 7, wherein the gas injection device is capable of adjusting either or both of a gas flow rate and a flow velocity.

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