JP6056410B2 - Granule removal method and powder collector - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a granular material removing method and a granular material collecting tool, and specifically, a granular material removing method for removing granular material clogged in a granular material blowing equipment from the equipment, and the equipment. The present invention relates to a granular material collecting tool for collecting granular material packed in a container.

  A granular material such as pulverized coal is supplied to the blast furnace from the blower tuyere of the blast furnace using a granular material blowing facility. The granular material blowing equipment is equipped with a lance, an injection tank, and a transportation pipe, and the granular material is supplied to the blast furnace by blowing the granular material into the lance connected to the blower tuyere using carrier gas. To do. In the supply direction of the granular material to the blast furnace, an injection tank that accommodates the granular material and a transport pipe that connects the injection tank and the lance are arranged upstream of the lance, and the granular material is transported It is supplied from the injection tank to the lance via the piping. During the daily operation of the blast furnace, there is a possibility of clogging the transportation pipe and lance.

  Regarding the detection of clogging of the granular material, Patent Document 1 continuously measures the surface temperature of the pipe through which the pulverized coal fed to the blast furnace passes, and processes the obtained temperature measurement information. A method for detecting pulverized coal clogging in the pipe has been proposed.

  Regarding removal of clogging of granular materials, Patent Document 2 discloses that a part of an air supply pipe in which nozzle clogging has occurred is cut off, and a dust remover whose outlet side is open to the atmosphere is connected to the nozzle side air supply pipe. A nozzle clogging release method has been proposed in which a nozzle clogging is released by applying a pressure difference between the internal pressure of the injection tank and the atmospheric pressure to the clogging portion. Patent Document 3 discloses a clogging removal device for a powder blowing lance comprising a connecting portion connected to a powder blowing lance and a movable portion inserted into the connecting portion and moving inside the lance. The movable part is inserted into the lance along the axial direction of the lance, and the tip of the movable part can be moved to the position of the lance tip. A clog removal device has been proposed.

JP 2001-40404 A JP 2006-63417 A JP 2000-160217 A

  The method of detecting pulverized coal clogging in piping proposed in Patent Document 1 merely detects clogging of pulverized coal and does not eliminate clogging. The nozzle clogging release method proposed in Patent Document 2 is to release clogging of the powder particles of the nozzle disposed in the injection tank, not to release clogging of the lance, and further to the flow of pulverized coal. For example, a part of the pulverized coal flow path becomes narrower from the upstream side toward the downstream side in order to pressurize the upstream side in the direction and flush the blocked pulverized coal to the downstream side to release clogging of the granular material. In the case of clogging, there is a problem that the clogging cannot be effectively removed. The lance clogging removal device proposed in Patent Document 3 has a complicated mechanism for removing the clogging, and the movable part has its tip reaching the tip from the rear end of the lance. Therefore, there is a problem that the apparatus is not practical in terms of handling.

  Furthermore, since the lance connected to the high temperature blast furnace is exposed to the heat from the air blower tuyeres, once the granular material stays in the lance, the granular material is easily carbonized at the position where the granular material stays. Will stick to the lance and clog. Since the lance can only be exchanged when there is no wind, the amount of powder blown during blast furnace operation becomes non-uniform, and if the lance is clogged with powder, the operating condition of the blast furnace will deteriorate. . In addition, depending on the structure of the lance and piping, the lance may have a narrow part, and the granular material is likely to be clogged in the narrow part, and furthermore, when releasing the clogging, the high temperature and carbon monoxide in the blast furnace is removed. It is necessary to prevent the contained gas from being inadvertently ejected into the atmosphere.

  The present invention has been made in view of the above problems and circumstances, and the object of the present invention is that it is possible to easily remove and collect the granular material packed in the granular material blowing facility from the facility. It is providing the granular material removal method to be performed, and a granular material collector.

The gist of the present invention for solving the above problems is as follows.
(1) A granular material packed in a lance connected to a blast furnace using a granular material collecting tool comprising a hollow tube and two collecting tool connecting portions provided at both ends of the hollow tube. , A method for removing particulate matter from the lance, wherein the first collector connection portion of the two collector connection portions is closed, and the second collector connection portion is Connected to the on-off valve arranged and closed on the powder body entrance side of the lance, and opening the on-off valve, from the blast furnace, together with a gas having a pressure higher than the internal pressure of the hollow tube, A method for removing a granular material, wherein the granular material packed inside the lance is sent to the hollow tube.
(2) A granular material collector comprising: a hollow tube; and two collector connection portions provided at both ends of the hollow tube.

  According to the present invention, it is possible to easily remove the granular material packed in the granular material blowing facility from the facility.

It is a schematic explanatory drawing of a granular material blowing facility. It is a schematic explanatory drawing which shows the state by which the fine powder collector was connected to the granular material injection | pouring equipment shown in FIG. It is a schematic explanatory drawing which shows the fine powder collector of this invention.

  Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a schematic explanatory diagram of a powder particle blowing facility. The granular material blowing facility 1 includes an injection tank 2, a transport pipe 3, and a lance 4, and the granular material blowing facility 1 is disposed in a blast furnace 5. The blast furnace 5 is provided with a blower tuyere 6, and the lance 4 is connected to the blast furnace 5 through the blower tuyere 6.

  Although not shown in the figure, the injection tank 2 is connected to a granular material supply mechanism such as a coal mill, and from the granular material supply mechanism, the granular material is sent to and stored in the injection tank 2. Is done. The transport pipe 3 is connected to the injection tank 2 and the lance 4, and the granular material accommodated in the injection tank 2 is supplied to the blast furnace 5 through the transport pipe 3 and the lance 4. In the blast furnace 5, coke put into the blast furnace 5 and blown particles (pulverized coal) act as a reducing material to reduce and dissolve iron ore. For this reason, the inside of the blast furnace in operation is in a high temperature and high pressure state such that the pressure is 400 kPa and the temperature of the tuyere is 2000 ° C., for example.

  The transport pipe 3 is composed of a pressure relief valve, an on-off valve, a distributor, a connection part, a pipe part, and a flexible pipe part. In the embodiment of FIG. A in order from the injection tank 2 along A, the granular material on-off valve 11, the distribution source on-off valve 12, the distributor 13, the flexible pipe end on-off valve 14, the supply side connection part 15, the blast furnace side connection part 16, A flexible piping pressure relief valve 17 and a terminal opening / closing valve 18 are provided. This end on-off valve 18 is arranged on the particle body entrance side of the lance 4 in the transport pipe 3.

  Although not shown in the figure, the blast furnace 5 is provided with a plurality of blower tuyere 6, and in the actual granular material blowing facility 1, the junction between the transport pipe 3 and the carrier gas pipe 23, and the distribution The transportation pipe 3 branches to a plurality of pipes connected to each of the plurality of blower tuyere 6 with the original opening / closing valve 12. Therefore, the equipment arranged on the downstream side of the distribution source opening / closing valve 12 is present in the number corresponding to the number of the ventilation tuyere 6 of the blast furnace 5. In FIG. 1, only the piping and equipment for transporting the granular material to the single blower tuyere 6 are shown.

  A carrier gas pipe 23 provided with a carrier gas on / off valve 22 is connected to the transport pipe 3 between the granular material on / off valve 11 and the distribution source on / off valve 12. With the carrier gas on-off valve 22 open, the carrier gas 21 is sent to the transport pipe 3 via the carrier gas pipe 23, and with the powder on-off valve 11 open, the powder is injected. The powder is sent from the tank 2 to the transport pipe 3 and transported by the carrier gas 21. As the carrier gas 21, air, nitrogen, or the like can be used.

  In the embodiment shown in FIG. 1, the blower tuyere 6 is provided with two lances 4, the transport pipe 3 is divided into two by a distributor 13, and the transport pipe 3 divided into two is two. One lance 4 is connected to each.

  The case where a granular material is supplied to the blast furnace 5 through the lance 4 is demonstrated. In FIG. 1, it is assumed that the two lances 4 are not clogged with powder. The portion of the transport pipe 3 between the supply side connection 15 and the blast furnace side connection 16 of the lance 4 is a flexible pipe 3a having shapes that can be connected to these connections at both ends. The supply side connection part 15 and the blast furnace side connection part 16 have a mechanism that allows the flexible pipe 3a to be attached and detached, and the flexible pipe 3a can be exchanged. As the supply side connection part 15 and the blast furnace side connection part 16, a fluid coupling coupler is mentioned, for example. Since the flexible pipe 3a is flexible, the direction of the lance 4 can be changed as appropriate.

  With the flexible pipe 3a connected to the supply side connection part 15 and the blast furnace side connection part 16, and the flexible pipe pressure relief valve 17 is closed, the granular material on-off valve 11 and the distribution source on-off valve 12 are connected. By opening the flexible pipe end opening / closing valve 14 and the terminal opening / closing valve 18, the granular material is supplied from the injection tank 2 to the blast furnace 5 through the transport pipe 3 and the lance 4.

  While the blast furnace 5 is operating, when the granular material passes through the lance 4, the granular material may stagnate there. When the lance 4 becomes a high temperature according to the blast furnace 5 and the powder particles are stagnated, the powder particles are carbonized and fixed to the lance 4 and / or the inorganic content of the powder particles is welded. Or the lance 4 is clogged. In that case, the granular material collector 31 of the present invention is attached to the granular material blowing equipment 1, and the clogged granular material is removed from the lance 4.

  The case where the granular material clogged in the lance 4 (powder blowing apparatus 1) is removed from the lance 4 will be described. FIG. 2 is a schematic explanatory view showing a state in which a fine powder collecting tool is connected to the granular material blowing facility shown in FIG. In the following description, the lower lance 4 shown in FIG. 1 is not clogged with the lance 4 on the lower side, and the granular material is supplied to the blast furnace 5 through the lance 4. The case where clogging of the granular material has occurred in the upper lance 4 will be described.

  In the transport pipe 3 connected to the upper lance 4, with the flexible pipe end on / off valve 14 and the terminal on / off valve 18 (open / close valve) closed, the flexible pipe depressurizing valve 17 is opened, During that time, the pressure of the transport pipe 3 (flexible pipe 3a) is lowered. Next, the flexible pipe 3 a is removed from between the supply side connection portion 15 and the blast furnace side connection portion 16. Thereafter, the granular material collecting tool 31 is attached to the blast furnace side connection portion 16. That is, FIG. 2 shows a state in which the granular material collecting tool 31 is attached to the blast furnace side connection portion 16 after the flexible pipe 3 a is removed from the granular material blowing facility 1.

  FIG. 3 is a schematic explanatory view showing the fine powder collecting tool 31 of the present invention. The granular material collector 31 includes a hollow tube 32 and two collector connection portions 33 and 34 provided at both ends of the hollow tube 32. Of these two collector connection portions 33 and 34, at least one collector connection portion only needs to have a mechanism that can be opened and closed. In the present embodiment, the two collector connection portions 33 are provided. 34 have a mechanism that can be opened and closed. That is, the first collector connection portion 33 is provided with a first collector connection portion on-off valve 37, and the second collector connection portion 34 is connected to the second collector connection portion 34. A partial opening / closing valve 38 is provided. The collector connection part opening / closing valves 37 and 38 are operated to open and close the collector connection parts 33 and 34.

Using this granular material collector 31, the following operations 1 to 4 are performed to remove the granular material clogged in the granular material blowing facility 1 (lance 4) from the granular material blowing facility 1.
1. The terminal open / close valve (open / close valve) 18 is closed (open / close valve is closed).
2. By opening the first collector connection portion 33, the internal pressure of the hollow tube 32 is set to atmospheric pressure, and then the first collector connection portion 33 is closed and the second collector is collected. The tool connecting portion 34 is connected to the blast furnace side connecting portion 16. Thereby, the 2nd collector connection part 34 is connected to the terminal on-off valve 18 via the blast furnace side connection part 16 (connection of a granular material collector).
3. Next, with the first collector connection part 33 closed, the end on-off valve 18 is opened, and the high-pressure gas in the blast furnace 5 is fed into the low-pressure (atmospheric pressure) hollow tube 32 (open / close) Open the valve). As a result, high-pressure gas flows into the hollow tube 32, and with the inflow of high-pressure gas, the granular material clogged in the lance 4 also flows in and collects the granular material. The internal pressure of the hollow tube 32 changes from atmospheric pressure to high pressure.
4). By closing the end opening / closing valve 18 and opening the first collector connection part 33, the gas and / or powder particles therein are removed from the hollow tube 32. At this time, the internal pressure of the hollow tube 32 changes from high pressure to atmospheric pressure.

  In the operation of 3 above, the powder particles packed in the lance 4 can move from the blast furnace 5 to the transport pipe 3 together with the high-pressure gas, and can flow into the hollow tube 32. The amount of gas and particles that can flow into the hollow tube 32 by opening it only once is the volume of the hollow tube 32. Depending on the capacity, only the gas may flow into the hollow tube 32 by opening the end opening / closing valve 18 only once. In that case, the above operations 1 to 4 are repeated until the granular material flows into the hollow tube 32.

  The capacity of the hollow tube 32 is preferably 2.0 to 15.0 liters. If the volume is smaller than 2.0 liters, the number of repetitions of the above operations 1 to 4 is excessive, which is not practical from the viewpoint of time and may not effectively remove clogging. Moreover, if it is larger than 15.0 liters, the granular material collector 31 becomes too large and is not practical in terms of handling. Furthermore, a large amount of gas in the blast furnace is diffused to the outside during work. In other words, it is not preferable to pass a large amount of high-temperature gas because there is a concern about the damage of the granular material collecting tool 31 itself. The inner diameter of the hollow tube is about 30.0 to 50.0 mm, and is preferably larger than the inner diameter of the lance so that the obstruction in the lance can easily move to the hollow tube. Moreover, the length of the middle space is preferably 2.0 to 10.0 m.

  Before performing the above operation 4, it is preferable to attach (connect) the granular material collection bag 35 to the first collector connection part 33 as shown in FIGS. The powder collection bag 35 is attached, the first collection tool connecting portion 33 is opened, and the gas and / or powder flowing into the hollow tube 32 is removed from the powder collection bag 35. To flow into and collect particulate matter. If this granular material collection bag 35 is a filter cloth, gas will flow out of the granular material collection bag 35, and a granular material will remain in the inside.

  If the second collector connection part 34 can be opened and closed, the second collector connection part 34 is closed in the second operation, and the second collector connection is performed in the third operation. An operation of opening the section 34 may be performed. By doing so, it is possible not only to open the end opening / closing valve 18 but also to determine the timing for sending the high-pressure gas in the blast furnace 5 to the hollow tube 32 not only by the second collector connection part 34. it can.

  The hollow tube 32 is preferably flexible. If the hollow tube 32 has flexibility, when a high-pressure gas is sent to the hollow tube 32, the hollow tube 32 that has been bent by gravity is strained by the pressure. By this tension, the operator can confirm that the gas from the blast furnace 5 has flowed into the hollow tube 32. A pressure gauge may be provided in the hollow tube 32, and the inflow of gas into the hollow tube 32 may be confirmed by a change in pressure indicated by the pressure gauge.

  When performing the operation 4 above, a detoxifying device for detoxifying carbon monoxide is connected to the tip of discharging the powder inside the hollow tube or arranged in the vicinity of the powder collector 31. It is preferable. This is because carbon monoxide contained in the gas discharged from the blast furnace 5 is harmful to the human body.

  As shown in FIG. 3, the hollow tube 32 is preferably provided with a hollow tube pressure relief valve 36. If the hollow tube pressure relief valve 36 is provided in the hollow tube 32, even if the operation of the above 4 or the flexible pipe pressure relief valve 17 is opened, the discharge of the granular material from the hollow tube 32 is not successful. The hollow tube 32 can be easily depressurized, and the granular material collecting tool 31 can be safely removed from the blast furnace side connection portion 16. Of course, when the hollow tube pressure relief valve 36 is provided in the hollow tube 32, the hollow tube pressure relief valve 36 is closed in the above-described operation 3.

  In the embodiment shown in FIGS. 1 and 2, two lances 4 are provided in the blower tuyere 6. However, the number of lances 4 provided in the blower tuyere 6 is not limited to this form, and even one lance 4 is two. There may be more than one. Among the plurality of lances 4, the granular material is supplied to the unfilled lance 4 in parallel with the operation of removing the granular material from the packed lance 4 using the granular material collecting tool 31 of the present invention. Therefore, it is possible to restore the granular material blowing equipment 1 while supplying the granular material to the blast furnace 5.

  As described above, the granular material removal method and the granular material collecting tool of the present invention can easily remove the granular material packed in the granular material blowing facility from the facility.

DESCRIPTION OF SYMBOLS 1 Granule injection equipment 2 Injection tank 3 Transport piping 3a Flexible piping 4 Lance 5 Blast furnace 6 Blower tuyeres 11 Granule opening-and-closing valve 12 Distribution origin on-off valve 13 Distributor 14 Flexible piping end on-off valve 15 Supply side Connection part 16 Blast furnace side connection part 17 Flexible pipe pressure relief valve 18 Terminal on-off valve 21 Carrier gas 22 Carrier gas on-off valve 23 Carrier gas pipe 31 Granule collection tool 32 Hollow tube 33 Collection tool connection part (first Collector connection part)
34 collector connection part (second collector connection part)
35 Powder collection bag 36 Hollow tube pressure release valve 37 Collector connection part on-off valve (first collector connection part on-off valve)
38 Collection tool connection part on-off valve (second collection tool connection part on-off valve)

Claims (4)

Using a powder collector including a hollow tube and two collector connection portions provided at both ends of the hollow tube, the powder tank is connected to an injection tank containing the powder and a blast furnace. A granular material removing method for removing the granular material packed in the lance of a granular material blowing facility comprising a lance and a transportation pipe for transporting the granular material from the injection tank to the lance. ,
While closing the 1st collector connection part among the two collector connection parts, the 2nd collector connection part is provided in the middle of the transportation piping, and the powder of the lance Connected to the on-off valve placed on the body entry side and closed,
By opening the on-off valve, a powder having a pressure higher than the internal pressure of the hollow tube is sent from the blast furnace to the hollow tube together with powder particles packed inside the lance. How to remove powder. The transport pipe includes a blast furnace side connection portion provided upstream of the on-off valve, a supply side connection portion provided upstream of the blast furnace side connection portion, and the supply side connection portion and the blast furnace side connection portion. Having flexible piping connected in between,
The flexible pipe is removed, and then the second collector connection part of the granular material collector is connected to the on-off valve via the blast furnace side connection part. The granular material removal method of description. Using a powder collector including a hollow tube and two collector connection portions provided at both ends of the hollow tube, the powder tank is connected to an injection tank containing the powder and a blast furnace. A granular material removing method for removing the granular material packed in the lance of a granular material blowing facility comprising a lance and a transportation pipe for transporting the granular material from the injection tank to the lance. ,
The granular material blowing equipment has a plurality of lances, and the granular material is removed by the granular material removing method according to claim 1 or 2 from the lance clogged with the granular material among the plurality of lances. The granular material removal method characterized by continuing the transportation of the granular material from the injection tank to a lance in which the granular material is not clogged among the plurality of lances. A hollow tube, and two collector connection portions provided at both ends of the hollow tube, an injection tank in which the granular material is accommodated, a lance connected to a blast furnace, and the granular material A granular material collecting tool used for removing the granular material clogged in the lance of the granular material blowing equipment provided with a transportation pipe for transporting from the injection tank to the lance, from the lance,
Of the two collector connection portions, at least one collector connection portion has a mechanism that can be opened and closed,
The said granular material collector is the said granular material by making it possible to connect one collector connection part among the said two collector connection parts to the connection part provided in the middle of the said transport piping. blow facilities are detachable, the collecting device connection unit is characterized isosamples via the connection portion is connectable to arranged off valve granular material entry side of the lance Powder collector.

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