JP6089927B2 - Method of monitoring pulverized coal supply facility and pulverized coal supply facility to blast furnace - Google Patents

Description

  The present invention relates to a method for monitoring pulverized coal supply equipment and pulverized coal supply equipment to a blast furnace.

  In blast furnace operation, in order to reduce the use of coke, pulverized coal (hereinafter referred to as pulverized coal) is blown into the blast furnace from the blast furnace tuyere together with a fluid such as air as auxiliary fuel. In the steelworks, pulverized coal supply equipment is installed in the blast furnace as equipment for blowing pulverized coal into the blast furnace.

  The pulverized coal supply equipment includes, for example, a reservoir tank that temporarily stores pulverized coal, a plurality of feed tanks that fluidize the pulverized coal sent from the reservoir tank, and a distributor of pulverized coal fluidized in the feed tank. A disperser for air-flowing and a distributor for distributing pulverized coal to a plurality of tuyere of the blast furnace are provided. The reservoir tank, feed tank, disperser, and distributor are each connected by piping.

  By the way, for stable operation of the blast furnace, it is desirable to stably inject pulverized coal as auxiliary fuel into the blast furnace at a target injection speed (injection amount per unit time). It is necessary to always operate normally. However, in practice, the operating speed of the blast furnace may become unstable because the blowing speed of pulverized coal is not stable. The cause can be a plurality of causes such as pulverized coal staying in the feed tank and clogging of piping between the feed tank and the blast furnace.

  Conventionally, in a pulverized coal supply facility, when the pulverized coal blowing speed fluctuates, a defective part is identified and cleaned or repaired at the time of facility inspection once every several months. However, enormous labor and time are required to identify the defective part. Patent Document 1 discloses a method for detecting clogging of piping.

JP-A-3-2304

  However, in the method of Patent Document 1, an abnormality in the piping can be detected, but an abnormality in the feed tank cannot be detected. Therefore, if the pulverized coal injection speed fluctuates and there is no abnormality in the piping, the entire equipment excluding the piping must be inspected. It still needs to be. In addition, in order to continuously supply pulverized coal to the blast furnace that is operating day and night, the pulverized coal supply facility has multiple feed tanks, but any one of these feed tanks has an abnormality. This will adversely affect the stable operation of the pulverized coal supply facility. Therefore, a means for detecting an abnormality in the feed tank at an early stage is desired.

  The present invention has been made in view of the above circumstances, and it is possible to easily detect an abnormality in a feed tank, and to monitor a pulverized coal supply facility capable of eliminating the abnormality during operation and pulverized coal to a blast furnace. It is an object to provide a supply facility.

In order to solve the above problems, the following means are adopted.
[1] to supply pulverized coal to the feed tank, then, the pulverized coal is blown fluidizing fluid from a plurality of flow Roh nozzle provided at the bottom of the feed tank with pressurizing the feed tank by pressurizing fluid A part or the whole of the pulverized coal supply equipment for supplying the pulverized coal to a blast furnace by sequentially sending the pulverized coal in the fluidized state to the outside of the feed tank.
Measuring the temperature of the side wall surface of the feed tank, calculating the temperature change rate (° C./min) of the side wall surface of the feed tank based on the measured temperature, and supplying the pulverized coal to the feed tank A method for monitoring a pulverized coal supply facility, wherein the flow state of the pulverized coal is determined to be abnormal when a temperature change rate (° C./min) of a side wall surface of the tank is less than a threshold value.
[2] When the temperature of the side wall surface is measured at a plurality of locations in the circumferential direction of the feed tank, and the temperature change rate (° C./min) of the side wall surface at any location is less than a threshold value, that location The method for monitoring a pulverized coal supply facility according to [1], wherein the flow state of the pulverized coal in is determined to be abnormal.
[3] When it is determined that the abnormal flow condition of the pulverized coal, the supply amount of the fluidizing fluid, characterized in that to increase from the steady amount [1] or a pulverized coal supply system according to [2] Monitoring method.
[4] If there is a portion determined by the flow state and abnormality of the pulverized coal, characterized in that to increase the supply amount of the fluidizing fluid from nearby flow Bruno nozzle of that point from the steady amount [2 ] The monitoring method of the pulverized coal supply facility described in the above.
[5] The amount of pulverized coal blown into the blast furnace is obtained, and when the amount of pulverized coal blown from a target value, monitoring of the temperature change rate of the side wall surface of the feed tank is started. The monitoring method of the pulverized coal supply facility according to any one of [1] to [4].
[6] A feed tank for storing a part or all of pulverized coal in a state of being fluidized by a fluidizing fluid;
A thermometer provided on a side wall surface of the feed tank;
A plurality of flow nozzles disposed at the bottom of the feed tank for supplying the fluidizing fluid into the feed tank,
Based on the temperature of the side wall surface measured by the thermometer, the temperature change rate (° C./min) of the side wall surface of the feed tank is calculated, and the feed tank when the pulverized coal is supplied to the feed tank is calculated. When the temperature change rate (° C./min) of the side wall surface is less than the threshold value, the control unit determines that the flow state of the pulverized coal is abnormal,
A facility for supplying pulverized coal to a blast furnace.
[7] The thermometer is installed at a plurality of locations in the circumferential direction of the side wall surface of the feed tank,
The said control part determines that the flow state of the said pulverized coal in the location is abnormal when the temperature change rate (degreeC / min) of the said side wall surface in any location is less than a threshold value. Equipment for supplying pulverized coal to a blast furnace according to 6].
[8] If it is determined that the abnormal flow condition of the pulverized coal, the control unit, according to the supply amount of the fluidizing fluid, characterized in that to increase from the steady amount [6] or [7] Equipment for supplying pulverized coal to the blast furnace.
[9] If there is a portion determined by an abnormal flow condition of the pulverized coal, the control unit, to increasing the supply amount of the fluidizing fluid from nearby flow Bruno nozzle of that point from the steady amount The pulverized coal supply facility to the blast furnace according to [7], which is characterized.
[10] Obtaining the amount of pulverized coal blown into a blast furnace, and when the amount of pulverized coal blown from a target value, the controller starts monitoring the rate of temperature change of the side wall surface of the feed tank. The pulverized coal supply equipment to the blast furnace according to any one of [6] to [9].

According to the monitoring method of the pulverized coal supply facility of the present invention, the temperature of the side wall surface of the feed tank is measured, and the temperature change rate (° C./min) of the side surface of the feed tank in the pulverized coal filling operation is less than the threshold value. In this case, when the control unit determines that the flow state of the pulverized coal is abnormal, the malfunction of the feed tank can be detected at an early stage.
In addition, when the temperature of the side wall surface of the feed tank is measured at a plurality of locations, and the temperature change rate (° C / min) at any location is less than the threshold, the flow state of pulverized coal at that location is determined to be abnormal. By doing this, it is possible to easily identify the location where the pulverized coal stays in the feed tank.
In addition, when it is determined that the flow state of pulverized coal is abnormal, the feed tank is forced to fluidize the remaining pulverized coal during operation of the blast furnace by increasing the supply amount of the fluidizing fluid from the steady amount. The malfunction of the can be eliminated at an early stage.
In addition, when the pulverized coal staying location in the feed tank is specified, the remaining pulverized coal is surely fluidized by increasing the amount of fluidized fluid supplied from a position close to the location. Malfunctions can be resolved early.
In addition, the amount of pulverized coal blown into the blast furnace is obtained, and when the amount of pulverized coal blown from the target value, the feed tank is started to monitor while the pulverized coal is being blown normally. Monitoring of the tank can be stopped, and the burden for monitoring can be reduced.

Further, according to the pulverized coal supply facility of the present invention, the temperature change of the side wall surface in the pulverized coal filling operation based on the thermometer provided on the side wall surface of the feed tank and the temperature of the side wall surface measured by the thermometer. Since the control unit that determines that the flow state of the pulverized coal is abnormal when the rate (° C./min) is less than the threshold value, malfunction of the feed tank can be detected early.
In addition, when the thermometer is installed at a plurality of locations in the circumferential direction of the side wall surface of the feed tank, and the control unit has a temperature change rate (° C./min) of the side wall surface at any location below a threshold value, Since the flow state of the pulverized coal at that location is determined to be abnormal, the location where the pulverized coal remains in the feed tank can be easily identified.
When it is determined the flow state of the pulverized coal and the abnormality, the control unit, because it increases the supply amount of the fluidizing fluid from a steady amount, in blast furnaces operating, forcibly fluidizing the pulverized coal remaining Therefore, malfunction of the feed tank can be resolved at an early stage.
Also, if there is a portion determined by the flow state of the pulverized coal and the abnormality, the control unit, because it increases the supply amount of the fluidizing fluid supplied from the constant amount from a position close to that point, ensure pulverized coal remaining The malfunction of the feed tank 1 can be eliminated at an early stage.
In addition, the amount of pulverized coal blown into the blast furnace is determined, and when the amount of pulverized coal blown from the target value, the control unit starts monitoring the rate of temperature change of the side wall surface of the feed tank. During normal operation, monitoring of the feed tank can be stopped, and the monitoring burden can be reduced.

FIG. 1 is a diagram for explaining the operation of the feed tank provided in the pulverized coal supply facility, and is a schematic diagram when the operation of the feed tank is normal. FIG. 2 is a diagram for explaining the operation of the feed tank provided in the pulverized coal supply facility, and is a schematic diagram when the operation of the feed tank is abnormal. FIG. 3 is a graph showing changes over time in the temperature of the side wall surface of the feed tank and the blowing speed of pulverized coal when the operation of the feed tank is normal. FIG. 4 is a graph showing the change over time in the temperature of the side wall surface of the feed tank and the blowing speed of pulverized coal when the operation of the feed tank is abnormal. Drawing 5 is a mimetic diagram showing pulverized coal supply equipment which is an embodiment of the present invention. Drawing 6 is a mimetic diagram showing the important section of pulverized coal supply equipment which is an embodiment of the present invention. FIG. 7 is a schematic diagram for explaining the operation of the feed tank provided in the pulverized coal supply facility according to the embodiment of the present invention.

  A pulverized coal supply facility as a facility for blowing pulverized coal into a blast furnace is provided with a plurality of feed tanks for fluidizing the pulverized coal. The operation of this feed tank will be described with reference to FIG.

  In the feed tank 100 shown in FIG. 1A, a plurality of pressure nozzles 102 provided on the side wall surface, a plurality of flow nozzles 103 provided at the bottom, and a pulverized coal introduction part 104 provided at the top. And a pulverized coal lead-out portion 105 provided at the bottom.

  The feed tank 100 includes an upper cylindrical portion 100a and a lower cone portion 100b. An opening 104a as a pulverized coal introducing portion 104 is provided on the upper portion of the cylindrical portion 100a. Further, the pressure nozzles 102 are located on the side wall surface of the cone portion 100 b, and the pressure nozzles 102 are provided at, for example, 4 to 8 locations along the circumferential direction of the feed tank 100.

  A fluidizing header chamber 106 is provided at the bottom of the cone portion 100 b, and the internal space of the cone portion 100 b and the fluidizing header chamber 106 are partitioned by a fluidizing plate 107. The fluidizing plate 107 is provided with a plurality of through holes (not shown). A fluid nozzle 103 is provided in the fluidization header chamber 106. The flow nozzles 103 are provided at, for example, 4 to 8 locations along the circumferential direction of the fluidization header chamber 106.

  Further, at the bottom of the cone portion 100b, a lead-out pipe 105a penetrating the fluidizing plate 107 and the fluidizing header chamber 106 is provided. The lead-out pipe 105a constitutes the pulverized coal lead-out part 105.

  In order to blow pulverized coal into the blast furnace, using a feed tank 100 shown in FIG. 1A, as shown in FIGS. 1B to 1E, filling operation of pulverized coal, pressurization in the tank The operation, the blowing operation, and the exhaust pressure operation are sequentially performed. Hereinafter, each operation will be described.

(Pulverized coal filling operation)
As shown in FIG.1 (b), pulverized coal PC is supplied in the feed tank 100 from the opening part 104a, and the inside of the feed tank 100 is filled with pulverized coal PC.

(Pressurizing operation in the tank)
As shown in FIG. 1C, a pressurizing fluid made of, for example, nitrogen gas is supplied from the pressurizing nozzle 102 to pressurize the feed tank 100. At the same time, a fluidizing fluid made of, for example, nitrogen is supplied from the fluid nozzle 103 into the feed tank 100 via the fluidizing header chamber 106 and the fluidizing plate 107. Of the pulverized coal PC supplied to the feed tank 100, the pulverized coal PC stored in the cone portion 100b is blown up by the fluidizing fluid to be in a fluid state. Moreover, depending on the filling amount of pulverized coal PC and the supply amount of fluidizing fluid, the entire pulverized coal PC is in a fluid state.

(Blowing action)
Next, as shown in FIG. 1 (d), while supplying a pressurizing fluid and a fluidizing fluid from the pressurizing nozzle 102 and the flow nozzle 103, respectively, the pulverized coal PC in a flowing state is supplied from the outlet pipe 105a to the feed tank 100. It is sent out and blown into the blast furnace. While the pulverized coal PC is sent to the outside of the feed tank 100, the pressurizing fluid and the fluidizing fluid are continuously supplied to pressurize the inside of the feed tank 100, and the flow state of the pulverized coal PC in the feed tank 100 is changed. maintain. The pulverized coal PC is sent out from the feed tank 100 due to the pressure difference between the internal pressure of the feed tank 100 and the internal pressure of the blast furnace.

(Exhaust pressure operation)
Next, as shown in FIG. 1 (e), when finished sending the pulverized coal PC is, by evacuating the feed tank 10 within 0 to stop the supply of the pressurizing fluid and fluidizing fluid, the feed tank 100 Is reduced to atmospheric pressure to prepare for the next supply of pulverized coal PC.

  A series of operations of the feed tank 100 described with reference to FIGS. 1B to 1E is a normal operation. On the other hand, a case where the operation of the feed tank 100 is abnormal will be described with reference to FIG.

  FIG. 2A illustrates a pressurizing operation on the feed tank 100 filled with pulverized coal PC. At the stage shown in FIG. 2 (a), it operates normally as in FIG. 1 (c).

  FIG. 2 (b) illustrates the operation of blowing pulverized coal, as in FIG. 1 (d). In FIG. 2 (b), the pulverized coal PC aggregates and stays in a part of the cone portion 100b. This may be due to, for example, clogging of some of the pressure nozzles 102 among the plurality of pressure nozzles, partial clogging of the flow plate 107, or clogging of some of the flow nozzles 103 among the plurality of flow nozzles. This is considered to be because fluidization of the pulverized coal PC became insufficient.

  Thereafter, as shown in FIG. 2 (c), although the exhaust pressure operation is performed, the pulverized coal remains. Then, although the pulverized coal filling operation is performed as shown in FIG. 2 (d), the pulverized coal staying at the stage of the exhaust pressure operation is highly likely to stay as it is in the next series of operations. There is also the possibility of inducing further pulverized coal retention.

  FIG. 2 (e) shows another example in which pulverized coal PC is partially retained. In this example, only a part of the pulverized coal PC in the cone portion 100b is normally sent, and the remaining pulverized coal PC is retained. This may be because, for example, the supply pressure of the pressurizing fluid from a part of the plurality of pressurizing nozzles is relatively higher than the steady value and the pulverized coal PC is preferentially sent out.

  As described above, in the example shown in FIG. 2, pulverized coal stays in the feed tank 100, thereby reducing the amount of pulverized coal supplied to the blast furnace and causing the pulverized coal injection speed to fluctuate. .

  The present inventors diligently investigated means for grasping the state of pulverized coal in the feed tank from the outside of the feed tank. It was noted that the pulverized coal supplied to the feed tank was relatively hot. Since pulverized coal is manufactured by pulverizing while drying coal, the temperature is about 60 to 80 ° C. As shown in FIG. 2B or FIG. 2E, when the pulverized coal stays in the feed tank, it often adheres to the inner surface of the cone portion 100b of the feed tank 100. Therefore, an attempt was made to detect the presence or absence of pulverized coal PC in the feed tank 100 from the behavior of the temperature change of the side wall surface of the feed tank 100.

  FIG. 3 and FIG. 4 are graphs showing temporal changes in the temperature of the side wall surface of the feed tank and the blowing speed of pulverized coal. In order to measure the temperature of the side wall surface of the feed tank, a surface thermometer was installed at a location below the boundary between the cylindrical portion and the cone portion and above the pressure nozzle, and the temperature change of the side wall surface was observed. . Thermometers were installed in four directions, east, west, south, and north, respectively, as seen from the center of the feed tank.

  FIG. 3 is a graph corresponding to a feed tank that operates normally as described with reference to FIGS. As shown in FIG. 3, in the feed tank that is operating normally, the pulverized coal blowing speed into the blast furnace exceeds the target value. In addition, thermometers installed at four locations in the east, west, south, and north can accurately grasp the behavior of pulverized coal in the feed tank. That is, the temperature of the side wall surface rises rapidly with the operation of filling the pulverized coal into the feed tank, the temperature of the side wall surface is maintained substantially constant during the pressurizing operation of the tank, and the temperature of the side wall surface is increased during the blowing operation of the pulverized coal. It can be seen that the temperature gradually decreases and the temperature of the side wall surface is reduced at a stroke in the exhaust pressure operation. In particular, it can be seen that the temperature decrease and the temperature increase occur abruptly between the exhaust pressure operation and the pulverized coal filling operation.

  On the other hand, FIG. 4 is a graph corresponding to a feed tank that operates abnormally as described in FIGS. In a feed tank in which the behavior of pulverized coal injection is abnormal, the pulverized coal injection speed into the blast furnace is lower than the target value. Of the thermometers installed at four locations in the east, west, north, and west, thermometers installed on the north, west, and east sides accurately grasp the pulverized coal staying in the feed tank. That is, according to these thermometers, no rapid temperature increase is observed in the pulverized coal filling operation. In this feed tank, it is presumed that pulverized coal remains attached to the inner surface of the side wall surface in a range from the east side to the west side with the north side as the center.

  From the above results, it has been found that whether or not pulverized coal is retained in the feed tank can be determined by the presence or absence of a rapid temperature change in the pulverized coal filling operation.

  Based on the above knowledge, embodiment of this invention is described. Drawing 5 is a mimetic diagram showing pulverized coal supply equipment which is an embodiment of the present invention. FIG. 6 is a schematic diagram showing a main part of the pulverized coal supply facility shown in FIG.

  The pulverized coal supply facility shown in FIG. 5 is fluidized by a reservoir tank 21 for temporarily storing the pulverized coal, a plurality of feed tanks 1 for fluidizing the pulverized coal sent from the reservoir tank 21, and the feed tank 1. A disperser 22 for air-conveying the pulverized coal to the distributor and a distributor 23 for distributing the pulverized coal to the plurality of tuyere 32 of the blast furnace 31 are provided. The reservoir tank 21, the feed tank 1, the disperser 22, and the distributor 23 are connected to each other by piping. The pulverized coal supply facility shown in FIG. 5 continuously supplies the pulverized coal to the blast furnace by sequentially performing the blowing operation of the pulverized coal in the plurality of feed tanks 1.

  As shown in FIG. 6, the feed tank 1 according to this embodiment includes a plurality of pressure nozzles 2 provided on the side wall surface, a plurality of flow nozzles 3 provided at the bottom, and fine powder provided at the top. It has a charcoal introduction part 4 and a pulverized coal lead-out part 5 provided at the bottom.

  The feed tank 1 is composed of an upper cylindrical portion 1a and a lower cone portion 1b. An opening 4a as a pulverized coal introducing portion 4 is provided on the upper portion of the cylindrical portion 1a. A pipe (not shown) is attached to the opening 4a, and the feed tank 1 and the reservoir tank 21 are connected via this pipe. Further, the pressure nozzle 2 is located on the side wall surface of the cone portion 1b. The pressure nozzles 2 are provided at, for example, 4 to 8 locations along the circumferential direction of the feed tank 1.

  A fluidizing header chamber 6 is provided at the bottom of the cone portion 1b. The internal space of the cone part 1 b and the fluidizing header chamber 6 are partitioned by a fluidizing plate 7. The fluidizing plate 7 is provided with a plurality of through holes (not shown). The fluidizing header chamber 6 is provided with a fluid nozzle 3. The flow nozzle 3 is provided at, for example, 4 to 8 locations along the circumferential direction of the fluidization header chamber 6.

  Further, at the bottom of the cone portion 1b, a lead-out pipe 5a penetrating the fluidizing plate 7 and the fluidizing header chamber 6 is provided, and the pulverized coal lead-out part 5 is constituted by the lead-out pipe 5a. A pipe (not shown) is attached to the outlet pipe 5a, and the feed tank 1 and the disperser 22 are connected via this pipe.

  A thermometer 11 is installed on the side wall surface of the cone portion 1 b of the feed tank 1. The thermometer 11 is installed at a location below the boundary between the cylindrical portion 1 a and the cone portion 1 b and above the pressure nozzle 2. Further, the thermometers 11 are installed at a plurality of locations in the circumferential direction of the side wall surface of the feed tank 1. In the example shown in FIG. 6, the feed tank 1 is installed in four directions, for example, in the east, west, south, and north directions as viewed from the center of the feed tank 1. The thermometer 11 can exemplify a magnet built-in thermometer (for example, manufactured by Anritsu Keiki Co., Ltd.) in which a magnet is attached to a thermocouple, for example, and may be attached to the side wall surface by a magnet.

  Each thermometer 11 is connected to the control unit 12, and the temperature measurement value of the side wall surface measured by each thermometer 11 is input to the control unit 12. In the control part 12, the temperature measurement value of a side wall surface is taken in continuously, and the temperature change rate (degreeC / min) of a side wall surface is calculated. And when the rate of temperature change at the time of introduction operation of pulverized coal in feed tank 1 is less than a threshold, it is judged that the flow state of pulverized coal is abnormal. The control unit 12 is connected to a pressurizing fluid supply control unit 13 and a fluidizing fluid supply control unit 14, and outputs control signals to the supply control units 13 and 14. For example, the control unit 12 is realized by the function of a central processing unit provided in the computer.

  The pressurization fluid supply control unit 13 receives a control signal from the control unit 12 and supplies the pressurization fluid to the feed tank 1. Similarly, the fluidized fluid supply controller 14 receives the control signal from the controller 12 and supplies the fluidized fluid to the feed tank 1. These supply control units 13 and 14 are realized by the function of a central processing unit provided in the computer, for example.

  Moreover, as shown in FIG. 6, the flange 41 is provided in the cylindrical part 1a of the feed tank 1, and this flange 41 is attached to the fixed deck 42 which makes a part of pulverized coal supply equipment. A load cell 43 is provided between the flange 41 and the fixed deck 42, and the load cell 43 is connected to the control unit 12. The load cell 43 measures the amount of pulverized coal in the feed tank 1, and the control unit 12 can measure the blowing speed, which is the blowing amount per unit time.

  Next, the monitoring method of the pulverized coal supply facility of this embodiment will be described with reference to FIG. FIG. 7A shows a state in which a part of the pulverized coal PC is not completely delivered and stays in the feed tank and is filled with a new pulverized coal, as in FIG. Show. The staying pulverized coal PC is highly likely to stay as it is in the next series of operations. As shown in FIG. 4, the change in the temperature of the side wall surface of the feed tank 1 in which the pulverized coal PC remains is small in the exhaust pressure operation and the filling operation. Therefore, the control unit 12 shown in FIG. 6 continuously calculates the temperature change rate (° C./min) of the side wall surface, and when the temperature change rate in the exhaust pressure operation or the filling operation becomes less than the threshold value, pulverized coal. It is determined that the PC flow state is abnormal. In other words, it is determined that the pulverized coal PC is staying. When it determines with the flow state of pulverized coal PC being abnormal, the control part 12 outputs that on the exterior. As an abnormality output method, for example, a display device connected to a computer constituting the control unit 12 may display an abnormality, or an alarm sound may be oscillated from a speaker device connected to the computer, These may be performed simultaneously. Further, a threshold value that is a criterion for determining whether or not the feed tank 1 is abnormal may be, for example, 0.5 ° C./min.

  When the pulverized coal PC stays at an uneven position in the feed tank 1, the temperature drop of the side wall surface of the feed tank 1 from the blowing operation to the exhaust pressure operation is suppressed by the heat of the retained pulverized coal PC. Thus, the temperature of the side wall surface at the staying portion remains high. If it does so, only in the residence part of pulverized coal, the temperature change rate in filling operation will become below a threshold. Therefore, a plurality of thermometers 11 are installed, the temperature change rate at each installation location is continuously measured, and the location where the temperature change rate is less than or equal to the threshold value is specified, whereby the fine powder in the feed tank 1 It becomes possible to specify the staying place of charcoal. What is necessary is just to output the specified retention location outside with the abnormality determination of the feed tank 1.

  In addition, when the control unit 12 determines that the flow state of the pulverized coal PC in the feed tank 1 is abnormal, the control unit 12 outputs a control signal for increasing the supply amount of the fluidizing fluid from the steady state to the supply control unit 14. Also good. As shown in FIG. 7B, by increasing the supply amount of the fluidizing fluid during the pressurizing operation, a large amount of fluidizing fluid is blown out from the fluid nozzle 3 of the feed tank 1, and agglomerated and retained. The stagnation of the pulverized coal PC can be eliminated by forcibly fluidizing the coal PC.

  In the feed tank 1 in which the stay of pulverized coal is eliminated, the blowing operation is normally performed as shown in FIG. 7 (c), and the exhaust pressure operation is also normally performed as shown in FIG. 7 (d).

  Further, when the control unit 12 increases the supply amount of the fluidizing fluid, in order to increase the supply amount of the fluidizing fluid only in the vicinity of the staying location of the pulverized coal PC specified earlier, a plurality of fluidizing nozzles are provided. Any one or two or more of the three may be selected, and the supply amount of the fluidizing fluid from the selected fluidizing nozzle may be increased from the steady state. Thus, by locally increasing the supply amount of the fluidizing fluid during the pressurizing operation, it is possible to more efficiently fluidize the staying pulverized coal PC and eliminate the stay of the pulverized coal PC. .

  The increase amount when the fluidizing fluid is increased from the steady state may be increased by, for example, 20% with respect to the supply amount in the steady state. The increase or decrease of the fluidizing fluid may increase the total amount of fluidizing fluid blown into the feed tank 1. Alternatively, only the fluidizing fluid from the target pressurizing nozzle may be increased without increasing the amount of the entire fluidizing fluid, and the fluidizing fluid from other pressurizing nozzles may be decreased accordingly.

  The feed tank may be monitored constantly by the thermometer 11 and the control unit 12. In addition, monitoring of the feed tank is not normally performed, and monitoring of the feed tank by the thermometer 11 and the control unit 12 is started when the pulverized coal blowing speed into the blast furnace is reduced from the target value. Good. Thereby, while the blowing of pulverized coal is normally performed, monitoring of the feed tank 1 can be stopped, and the burden for monitoring can be reduced.

  Moreover, although said embodiment demonstrated the case where the control part 12 controlled operation | movement of the supply control parts 13 and 14, this invention is not limited to this, The control part 12 is a computer about abnormality of the flow state of pulverized coal. The supply amount of the fluidizing fluid may be controlled based on the judgment of an operator who has displayed the information through a display device or the like and confirmed the abnormality display.

  Similarly, when the control unit 12 displays an abnormality in the flow state of pulverized coal to the outside through a display device such as a computer, an operator who confirms the abnormality display performs the continuous monitoring of the feed tank 1. You may decide and monitor continuously.

As described above, according to the monitoring method of the pulverized coal supply facility of the present embodiment, the temperature of the side wall surface of the feed tank 1 is measured, and the temperature change rate ( By determining that the flow state of the pulverized coal is abnormal when (° C./min) is less than the threshold value, the malfunction of the feed tank 1 can be detected at an early stage.
Moreover, when the temperature in the some location of the circumferential direction of the side wall surface of the feed tank 1 is measured and the temperature change rate (degreeC / min) in any location is less than a threshold value, of the pulverized coal PC in the location By determining that the flow state is abnormal, it is possible to easily identify the remaining portion of the pulverized coal in the feed tank.
Further, when it is determined that the flow state of the pulverized coal is abnormal, a command is issued to the supply control unit 14 to increase the supply amount of the fluidizing fluid from the steady amount, thereby forcibly fluidizing the pulverized coal that remains. Thus, the malfunction of the feed tank 1 can be eliminated at an early stage. Moreover, by increasing the supply amount of fluidizing fluid in the pressurizing operation and eliminating the retention of pulverized coal PC, the retention of pulverized coal can be eliminated during operation of the feed tank 1, and the amount of pulverized coal injected can be stabilized. Maintain and contribute to the stabilization of blast furnace operation.
Moreover, when the staying place of the pulverized coal in the feed tank 1 is specified, by increasing the supply amount of the fluidizing fluid from the position close to the place, the staying pulverized coal PC is surely fluidized and fed. The malfunction of the tank 1 can be eliminated at an early stage.
Further, the amount of pulverized coal injected into the blast furnace is obtained, and when the amount of pulverized coal injected falls from the target value, the control unit 12 starts monitoring the feed tank 1 so that the pulverized coal PC is normally injected. While it is being monitored, monitoring of the feed tank 1 can be stopped, and the burden for monitoring can be reduced.

Further, the pulverized coal supply facility of the present embodiment includes a thermometer 11 provided on the side wall surface of the feed tank 1 and a side wall surface in the pulverized coal filling operation based on the temperature of the side wall surface measured by the thermometer 11. Since the control unit 12 that determines that the flow state of the pulverized coal is abnormal when the temperature change rate (° C./minute) of the feed tank is less than the threshold value, the malfunction of the feed tank can be detected early.
Moreover, the thermometer 11 is installed in the several location of the circumferential direction of the side wall surface of the feed tank 1, and the control part 12 has the temperature change rate (degreeC / min) of the side wall surface in any location below a threshold value. In such a case, since the flow state of the pulverized coal at that location is determined to be abnormal, the location where the pulverized coal stays in the feed tank 1 can be easily identified.
Further, when the flow state of the pulverized coal is determined to be abnormal, the control unit 12 increases the supply amount of the fluidizing fluid from the steady amount, so that the remaining pulverized coal is fluidized by force. Malfunctions can be resolved early.
In addition, when there is a place where the flow state of the pulverized coal is determined to be abnormal, the control unit 12 increases the supply amount of the fluidizing fluid supplied from a position close to the place from the steady amount. The fluidization can be ensured and the malfunction of the feed tank 1 can be eliminated at an early stage.
Further, the amount of pulverized coal blown into the blast furnace is obtained, and when the amount of pulverized coal blown down from the target value, the control unit 12 starts monitoring the rate of temperature change of the side wall surface of the feed tank 1. Monitoring of the feed tank 1 can be stopped while the air is normally blown, and the burden for monitoring can be reduced.

1 ... feed tank, 3 ... liquidity Roh nozzle, 11 ... thermometer, 12 ... control unit, PC ... pulverized coal.

Claims (10)

Supplies pulverized coal to the feed tank, then a part of the pulverized coal is blown fluidizing fluid from a plurality of flow Roh nozzle provided at the bottom of the feed tank with pressurizing the feed tank by pressurizing fluid Alternatively, the whole is in a fluid state, and then the pulverized coal in the fluid state is sequentially sent out of the feed tank, thereby monitoring the pulverized coal supply facility for supplying the pulverized coal to a blast furnace,
Measuring the temperature of the side wall surface of the feed tank, calculating the temperature change rate (° C./min) of the side wall surface of the feed tank based on the measured temperature, and supplying the pulverized coal to the feed tank A method for monitoring a pulverized coal supply facility, wherein the flow state of the pulverized coal is determined to be abnormal when a temperature change rate (° C./min) of a side wall surface of the tank is less than a threshold value.   When the temperature of the side wall surface is measured at a plurality of locations in the circumferential direction of the feed tank, and the temperature change rate (° C./min) of the side wall surface at any location is less than a threshold value, the fine powder at that location The method for monitoring pulverized coal supply equipment according to claim 1, wherein the flow state of the coal is determined to be abnormal. When it is determined that the abnormal flow condition of the pulverized coal, the method of monitoring the pulverized coal supply system according to claim 1 or claim 2, characterized in that to increase the supply amount of the fluidizing fluid from a steady amount. If there are places where it is determined that the abnormal flow condition of the pulverized coal, according to claim 2, characterized in that to increase the supply amount of the fluidizing fluid from nearby flow Bruno nozzle of that point from the steady amount Monitoring method for pulverized coal supply equipment.   The amount of pulverized coal blown into the blast furnace is obtained, and when the amount of pulverized coal blown from a target value, monitoring of the rate of temperature change of the side wall surface of the feed tank is started. The monitoring method of the pulverized coal supply equipment as described in any one of thru | or 4. A feed tank for storing a part or all of pulverized coal in a state of being fluidized by a fluidizing fluid;
A thermometer provided on a side wall surface of the feed tank;
A plurality of flow nozzles disposed at the bottom of the feed tank for supplying the fluidizing fluid into the feed tank,
Based on the temperature of the side wall surface measured by the thermometer, the temperature change rate (° C./min) of the side wall surface of the feed tank is calculated, and the feed tank when the pulverized coal is supplied to the feed tank is calculated. When the temperature change rate (° C./min) of the side wall surface is less than the threshold value, the control unit determines that the flow state of the pulverized coal is abnormal,
A facility for supplying pulverized coal to a blast furnace. The thermometers are installed at a plurality of locations in the circumferential direction of the side wall surface of the feed tank,
The said control part determines that the flow state of the said pulverized coal in the location is abnormal when the temperature change rate (degreeC / min) of the said side wall surface in any location is less than a threshold value. Item 7. A facility for supplying pulverized coal to a blast furnace according to item 6. When it is determined that the abnormal flow condition of the pulverized coal, the control unit, to the blast furnace according to claim 6 or claim 7, characterized in that to increase the supply amount of the fluidizing fluid from a steady weight Pulverized coal supply equipment. If there are places where it is determined that the abnormal flow condition of the pulverized coal, the control unit is characterized by increasing the supply amount of the fluidizing fluid from nearby flow Bruno nozzle of that point from the steady amount The equipment for supplying pulverized coal to the blast furnace according to claim 7.   The amount of pulverized coal blown into a blast furnace is obtained, and when the amount of pulverized coal blown from a target value, the control unit starts monitoring the rate of temperature change of the side wall surface of the feed tank. The equipment for supplying pulverized coal to a blast furnace according to any one of claims 6 to 9.

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