JP6115118B2 - History management method of sintering machine pallet - Google Patents

Description

  In the present invention, when sintering raw materials including iron ore, auxiliary raw materials, carbonaceous materials, etc. are sintered with a Dwytroid (DL) type sintering machine, the history of pallets is managed in order to stably continue the sintering operation. It is about how to do.

  Conventionally, sintered ore including iron ore, auxiliary materials, carbonaceous materials, etc. is sintered with a DL type sintering machine to produce sintered ore charged into a blast furnace.

  As shown in FIG. 1, the DL-type sintering machine is connected endlessly between two sprockets 5 and rotates around the pallet 1 (in the direction of the arrow in the figure). A hopper 3 for charging a sintered raw material such as a layer, an ignition furnace 4 for igniting the sintered raw material deposited on the pallet, and air under the pallet 1 is sucked through the sintered layer and the raw material layer. It consists of a windbox 2. The wind box 2 is connected to a single intake pipe 6.

  An air seal plate (not shown) that maintains airtightness between the wind box 2 and the pallet 1 is attached to the upper end of the wind box 2. The lower end of the pallet 1 slides on the air seal plate to maintain airtightness. However, since the air seal plate is worn, a gap is formed between the wind box 2 and the pallet 1, and the outside air enters the wind box 2. To do. That is, air leakage occurs between the wind box 2 and the pallet 1.

  Leakage also occurs on the pallet 1. When the pallet is worn, air leakage is generated in the pallet itself, and the gap between adjacent pallets is expanded due to wear and the air leakage is generated.

  The air leakage generated in the sintering machine adversely affects the progress of the sintering and leads to a decrease in productivity. Therefore, it is important to detect the location of the air leakage and take measures. Therefore, various air leakage detection methods have been proposed so far (for example, see Patent Documents 1 to 5).

  For example, Patent Document 5 discloses that the oxygen concentration and temperature are measured on the upstream side and the downstream side of the exhaust gas flow of the exhaust gas treatment system of the sintering machine, and the leakage state is detected from the difference in oxygen concentration or the difference in temperature. A characteristic air leakage detection method is disclosed.

  The air leak detection method of Patent Document 5 (a) can measure the air leak rate with high accuracy and can quantify the amount of air leak, which makes the judgment of equipment repair accurate. (B) Small amount of air leak (initial air leak) It is possible to find the location of the air leak and take immediate measures, and (c) the air leakage rate is greatly reduced and the power cost of the exhaust gas suction blower is reduced. Because it is necessary to measure the oxygen concentration in the pallet, it is difficult to specify the location of the pallet air leakage.

  A certain amount of air required for the sintering reaction is required to perform the sintering accurately on the rotating pallet. However, if air leakage occurs in the sintering machine, ensure the necessary amount of air. The sintering reaction becomes unstable and the quality of the sintered ore becomes non-uniform.

  As described above, the air leakage occurs not only on the sliding portion of the air seal plate but also on the pallet itself and the adjacent portion. According to the applicant's survey results, 20-50% of the air leakage is caused by wear of the pallet.

  However, the conventional air leakage detection detects the total amount of air leakage occurring at the location of the air leakage, and does not contribute to accurate control of sintering on the pallet in this respect. In view of this point, the applicant proposed in Patent Documents 6 and 7 an air leakage detection device that detects an air leakage generated on a pallet.

  The air leak detection devices of Patent Documents 6 and 7 are configured to place a laser oximeter at a predetermined position directly above the pallet at the upper part of the wind box, and specify a pallet that leaks air based on the measured oxygen concentration and the pallet position. is there.

JP 56-105436 A JP 58-189337 A JP 60-48484 A JP-A 61-195929 JP-A-6-300459 JP 2009-275239 A JP 2010-007904 A

  As described above, the air leakage of the sintering machine also occurs on the pallet itself. The air leakage adversely affects the progress of sintering and leads to a decrease in productivity. Therefore, in order to continue the sintering operation stably, a pallet that leaks air (hereinafter sometimes referred to as “air leakage pallet”) is specified. Need to be replaced with a new pallet. After the replacement, the air leakage pallet is used again after repairing the worn portion where the air leakage occurs.

  For this purpose, it is necessary to manage the operation history of pallet leakage, wear, etc. for each pallet and identify and repair the leakage pallet to be repaired at an early stage. In view of this, an object of the present invention is to provide a history management method for managing the history of a sintering machine pallet.

  The gist of the present invention for achieving the above object is as follows.

(1) In the pallet of the sintering machine that sinters the sintering raw material on the rotating pallet, in order to identify the worn pallet early, it is a method of managing the operation history of the pallet,
(I) A laser oximeter provided immediately below the pallet continuously measures the oxygen concentration of the sintering gas passing through the pallet, and the pallet passing immediately above the laser oximeter is pallet Identify with a recognition device,
(Ii) Based on the oxygen concentration distribution for each identified pallet and the fluctuation of each circulation of the oxygen concentration distribution, the location of the air leakage in the identified pallet is specified, and the location of the air leakage is used as a history for the history management means. enter,
(Iii) A pallet that requires repair is identified based on the operation history, and after repairing the pallet that requires repair, the repair result is input to the history management means as an operation history. History management method for sintering machine pallets.

( 2 ) The history management method for a sintering machine pallet according to (1 ), wherein the history management means is attached to the pallet.

( 3 ) The history management method for a sintering machine pallet according to (2) , wherein a pallet identification mark is stored in the history management means, and the pallet identification mark is identified by the pallet identification device.

  According to the present invention, since the air leak pallet to be repaired is identified and replaced at an early stage based on the operation history, the life of the pallet is extended and the sintering operation can be continued stably.

It is a figure which shows the basic aspect of a sintering machine. It is a figure which shows the aspect of the sintering machine which provided the laser type oxygen concentration meter in the upper part of the wind box. (A) shows the upper surface aspect of a sintering machine (a raw material supply hopper and an ignition furnace are not shown in figure), (b) shows the side surface aspect of a sintering machine. It is a figure which shows the AA cross section of Fig.2 (a). It is a figure which shows an example of the oxygen concentration for every measured pallet. It is a figure which shows typically the relationship between oxygen concentration and a leak location. It is a figure which shows the location which has a possibility of an air leak in the cross section of a pallet. It is a figure which shows the oxygen concentration before and behind repair of a pallet.

The history management method for a sintering machine pallet of the present invention (hereinafter sometimes referred to as “the method of the present invention”) is a method for quickly removing a worn pallet in a sintering machine pallet that sinters a sintering raw material on a rotating pallet. Is a method of managing the operation history of the pallet,
(I) A laser oximeter provided immediately below the pallet continuously measures the oxygen concentration of the sintering gas passing through the pallet, and the pallet passing immediately above the laser oximeter is pallet Identify with a recognition device,
(Ii) Based on the oxygen concentration distribution for each identified pallet and the fluctuation of each circulation of the oxygen concentration distribution, the location of the air leakage in the identified pallet is specified, and the location of the air leakage is used as a history for the history management means. enter,
(Iii) A pallet that requires repair is identified based on the operation history, and after repairing the pallet that requires repair, the repair result is input to the history management means as an operation history. .

  Hereinafter, the method of the present invention will be described with reference to the drawings.

  FIG. 2 shows an embodiment of a sintering machine in which a laser oximeter is provided on the upper part of the window box. The sintering machine shown in FIG. 2 has basically the same structure as the sintering machine shown in FIG. FIG. 2A shows a top view of the sintering machine (raw material supply hopper 3 and ignition furnace 4 are not shown), and FIG. 2B shows a side view of the sintering machine. The laser oxygen concentration meter 7 can measure the oxygen concentration in the pallet width direction (circulation direction) of the pallet that circulates.

  In the sintering machine shown in FIG. 2, a laser oximeter 7 is arranged on the upper part of the window box 2 facing the ignition furnace 4. The laser oximeter 7 includes a light emitter 9 and a light receiver 10, and the light receiver 10 is connected to an oxygen concentration display device 8.

  FIG. 2 shows a mode in which the laser oximeter 7 is arranged in the wind box 2 facing the ignition furnace 4, but in the method of the present invention, oxygen that can detect the location of the air leakage in the pallet width direction of the pallet. As long as the concentration can be measured, the position of the laser oximeter is not limited to the upper part of a specific window box. However, since the air leak diffuses, the laser oximeter is preferably arranged close to the pallet in order to accurately detect the location of the air leak.

  The number of laser oximeters to be arranged is one as long as the oxygen concentration in the pallet width direction can be measured and the location of the air leak can be detected. However, in order to increase the detection reliability, two or more laser oximeters are arranged. Also good.

  FIG. 3 shows an AA cross section of FIG. The pallet 1 is composed of a bottom portion on which the great bars 1a are arranged and a side portion 1b, in which a sintering raw material 15 is accommodated. The pallet 1 includes wheels 11 on both outer sides of the side portion 1b. The wheel 11 rolls on the rail 12 supported by the gantry 12a provided on the outer frame 13 attached to the outside of the upper side wall 2a of the wind box 2, and the pallet 1 circulates.

  The lower end portion of the pallet 1 slides on the air seal plate 14 attached to the upper end surface of the upper side wall 2a of the wind box 2 while maintaining the airtightness as the pallet 1 turns.

  On the upper side wall 2 a of the wind box 2, a light emitter 9 that emits infrared laser light L and a light receiver 10 that receives the laser light L that has traversed the wind box 2 are arranged, and a laser oximeter 7 is configured. ing.

  With the laser oxygen concentration meter 7, the oxygen concentration of the sintering gas sucked by the wind box 2 is measured directly under the pallet 2. As described above, the position immediately below the pallet for measuring the oxygen concentration is preferably closer to the pallet bottom. The oxygen concentration measured by the laser oxygen concentration meter 7 is transmitted to the oxygen concentration display device 8 (see FIG. 2A) and displayed on the screen. This display will be described later.

  An electronic device 16 containing pallet identification information is attached to the side 1 b of the pallet 1 in order to identify the pallet 1 that passes over the laser oximeter 7. The electronic device 16 can be used as history management means described later. The pallet may be identified using a pallet identification mark stored in the history management means.

  An ID tag may be used as the electronic device 16. In addition, as the electronic device 16, a barcode (one-dimensional code) and various two-dimensional codes (commercially available codes such as QR code (registered trademark) and CP code) can be used. Non-contact magnetic cards, ID tags, and IC tags can also be used.

  The pallet identification information read from the electronic device 16 by the reading sensor 17 is transmitted to the oxygen concentration display device 8 (see FIG. 2A). The measured oxygen concentration distribution in the pallet width direction is displayed on the display screen of the oxygen concentration display device 8 for each pallet identified based on the pallet identification information.

FIG. 4 shows an example of the oxygen concentration measured for each pallet. The following can be understood from FIG.
(A) The oxygen concentration in the pallet width direction is different for each pallet.
(B) The oxygen concentration is high in the pallet and the adjacent part of the pallet.
(C) The oxygen concentration in the pallet and the adjacent part of the pallet is different for each adjacent part.
(D) There is a pallet with a high oxygen concentration at the center of the pallet.

  Although the pallet is worn by the sintering operation, the degree and location of wear differ between pallets, and as a result, it is assumed that the oxygen concentration in the pallet width direction is different for each pallet.

  It is inevitable that a certain amount of air leakage will occur at the pallet and the adjacent part of the pallet, and the oxygen concentration will be high, but at the pallet adjacent part where the oxygen concentration is extremely high, the gap will expand due to wear of the pallet edge, It is estimated that a large air leak has occurred. In a pallet with a high oxygen concentration at the center of the pallet, it is presumed that air leakage occurs at the center.

  Based on the above, FIG. 5 schematically shows the relationship between the oxygen concentration and the location of the air leakage. The place where the oxygen concentration is high is the location where the air leaks.

Air leakage occurs in the adjacent portion xy between the pallet 1x and the pallet 1y and in the adjacent portion yz between the pallet 1y and the pallet 1z. Oxygen concentration in the adjacent portion xy is because significantly higher than the oxygen concentration of the adjacent portion yz, the adjacent portion xy, the gap becomes larger end portions of the pallet 1y palette 1x is worn, the Mokaze point S ₁ It can be judged that

Further, since the oxygen concentration is high at the central portion of the pallet 1x, greater wear at the center of the pallet, it can be determined that the central portion is in the Mokaze point S _2.

  Thus, by measuring and displaying the oxygen concentration over the width Dp of the circulating pallet, it is possible to identify the location of the air leakage in the circulating pallet. Since the air leakage is due to wear of the pallet, it can be said that the pallet having the air leakage portion with a remarkably high oxygen concentration is a pallet with remarkable wear.

  FIG. 6 shows locations where the possibility of air leakage is high in the pallet cross section. As shown in FIG. 6, Sw, Sx, Sy, and Sz are locations where air leakage can occur. In other words, when air leakage occurs in the pallet and adjacent parts of the pallet, the oxygen concentration in the adjacent part increases, and air leakage occurs in one or more of Sw, Sx, Sy, and Sz. The oxygen concentration in the center of the pallet increases.

  Thus, since the location where the air leakage occurs in the pallet is limited, the location of the air leakage can be easily identified from the position where the oxygen concentration is increased in the oxygen concentration distribution in the pallet width direction displayed for each pallet. .

However, as shown in FIG. 5, even if the central portion of the pallet 1x is it the Mokaze point S _2, when measuring the next oxygen concentration, at the central portion of the pallet 1x, which may increase the oxygen concentration does not appear . This means that the air leak location S ₂ is not a steady air leak location due to pallet wear but a single air leak location due to non-uniform deposition of the sintering material.

  Therefore, the oxygen concentration distribution of the pallet is compared for each turn, the fluctuation of the oxygen concentration accompanying the turn of the pallet is confirmed, and the continuous air leak due to wear and the single air leak are distinguished.

  And the air leak location where the continuous air leak resulting from wear of the pallet is generated is input to the history management means as the operation history for each identified pallet together with the oxygen concentration of the air leak location.

  The history management means outputs the operation history related to the pallet air leakage in pallet order, and identifies the pallet that needs repair.

  The repair result of the pallet is input to the history management means as an operation history related to the repair. The history management means may be provided around the sintering machine, or an electronic device attached to the pallet may be used.

  By managing the operation history (air leakage history and repair history) with the history management means, the wear state of the pallet is comprehensively diagnosed, and the pallet that needs repair is identified and repaired at an early stage. As a result, the lifetime of the pallet is extended and the sintering operation can be stably continued.

  Next, examples of the present invention will be described. The conditions of the examples are one example of conditions adopted for confirming the feasibility and effects of the present invention, and the present invention is limited to this one example of conditions. Is not to be done. The present invention can adopt various conditions as long as the object of the present invention is achieved without departing from the gist of the present invention.

Example 1
In the sintering machine (see Fig. 2) where the laser oximeter is placed in the wind box facing the ignition furnace, the laser oximeter in the combustion gas sucked by the window box while the pallet goes around The oxygen leak was measured to identify the location of the air leak. The leakage location and the oxygen concentration at the leakage location were input to the history management means as the operation history related to the leakage.

  The operation history related to the air leakage was output from the history management means, the pallet requiring repair was identified, and the pallet was replaced with a new pallet during the periodic inspection of the sintering machine.

  FIG. 7 shows the transition of oxygen concentration before and after the introduction of the present invention. The oxygen concentration is an average value of oxygen concentrations measured in the pallet width direction. The circles in FIG. 7 indicate the transition of oxygen concentration before the introduction of the present invention. In the figure, the oxygen concentration of pallet numbers 29 to 32 is high in the enclosure A, the oxygen concentration of pallet numbers 59 to 62 is high in the enclosure B, and it is determined that air leakage occurs in the pallets of these numbers. .

  Therefore, at the periodic inspection of the sintering machine, the pallets with pallet numbers 29 to 32 and pallet numbers 59 to 62 were replaced with new pallets. As a result, the oxygen concentration decreased to the level indicated by the mark ● in FIG.

  As described above, according to the present invention, since the wind pallet to be repaired is identified and replaced at an early stage based on the operation history, the life of the pallet is extended and the sintering operation can be stably continued. Therefore, the present invention has high applicability in the steel industry.

1, 1x, 1y, 1z palette
xy, yz Adjacent part 1a Great bar 1b Side part 2 Wind box 2a Upper side wall 3 Hopper 4 Ignition furnace 5 Sprocket 6 Intake pipe 7 Laser type oxygen concentration meter 8 Oxygen concentration display device 9 Light emitter 10 Light receiver 11 Wheel 12 Rail 12a Mount 13 Outer frame 14 Air seal plate 15 Sintering raw material 16 Electronic device 17 Reading sensor L Laser beam Dp Pallet width S ₁ Air leakage location (adjacent part)
S ₂ air leak location (central part)
Sw, Sx, Sy, Sz

Claims (3)

In the pallet of the sintering machine that sinters the sintering raw material on the rotating pallet, in order to identify the worn pallet early, it is a method of managing the operation history of the pallet,
(I) A laser oximeter provided immediately below the pallet continuously measures the oxygen concentration of the sintering gas passing through the pallet, and the pallet passing immediately above the laser oximeter is pallet Identify with a recognition device,
(Ii) Based on the oxygen concentration distribution for each identified pallet and the fluctuation of each circulation of the oxygen concentration distribution, the location of the air leakage in the identified pallet is specified, and the location of the air leakage is used as a history for the history management means. enter,
(Iii) A pallet that requires repair is identified based on the operation history, and after repairing the pallet that requires repair, the repair result is input to the history management means as an operation history. History management method for sintering machine pallets. The history management method for a sintering machine pallet according to claim 1, wherein the history management means is attached to the pallet. 3. The history management method for a sintering machine pallet according to claim 2 , wherein a pallet identification mark is stored in the history management means, and the pallet identification mark is identified by the pallet identification device.

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