Gas component concentration measuring device, gas component concentration measuring method, and method for detecting air leakage in sintering equipment

Abstract

To enable easily detecting the wind leakage of plural wind boxes composing a sintering machine facility.SOLUTION: A gas component concentration measurement device comprises: plural gas sampling tubes provided below a raw material mounting face of a pallet movable on an endless track of a sintering machine; and an analyzer analyzing a component concentration of gases sampled from the gas sampling tubes. Therein, a gas suction port of the gas sampling tube is arranged between a lower end of the pallet and a lower end of a grate bar forming the raw material mounting face in a height direction.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a gas component concentration measuring device and a gas component concentration measuring method used in a sintering machine facility, and a method for detecting air leakage in a sintering machine facility. [Background technology]

[0002] A sintering machine is a facility in which raw materials are charged onto pallets in layers, ignited in an ignition furnace, and then the carbonaceous material contained in the raw materials is burned while ventilation is applied, using the resulting combustion heat to sinter the ore and slag-forming materials. The pallets are connected in a chain and moved on a rotating endless track to continuously produce sintered ore. The ventilation is driven by an exhaust fan (blower) downstream of the exhaust gas system and is drawn in through a wind box (also called a wind box) below the pallets. This draws air from the surface of the sintering raw material layer charged on the pallets and causes it to flow downward. From the ignition furnace onwards, the combustion zone in the sintering raw material layer gradually propagates downward as the pallets move.

[0003] Because air is sucked downward, sealing mechanisms are installed at the joints between pallets and between the pallets and rails. However, if gaps appear due to deformation of the pallets or rails, air can leak through the gaps. Furthermore, if holes develop in the exhaust gas system piping due to aging or other reasons, air can leak through the holes. Air leakage prevents normal ventilation in the sintering machine and worsens the combustion state of the raw materials, thereby reducing the productivity and properties of the sintered ore product. Therefore, it is necessary to reduce air leakage through equipment repairs, but in order to carry out repairs, it is first necessary to detect the location of the air leakage.

[0004] Conventionally, air leakage detection in sintering machines has mainly been performed by detecting air leakage from the pallet section, for example, by measuring the oxygen concentration directly below the pallet in a wind box or the like (for example, Patent Documents 1 and 2). There has also been a demand for detecting the location of air leakage in the wind box. For example, Patent Document 3 discloses a technology for detecting the location of air leakage in the wind box by installing a gas sampling tube set with multiple gas sampling ports in the width direction of the pallet cart inside the wind box. With this method, the location of air leakage can be detected relatively accurately for wind boxes in which gas sampling tubes are installed. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2009-275239 [Patent Document 2] Japanese Patent Application Laid-Open No. 2014-092296 [Patent Document 3] Japanese Patent Publication No. 2020-079683 Summary of the Invention [Problem to be solved by the invention]

[0006] However, as sintering machines become increasingly old, there is an increasing need to quickly detect air leaks throughout the multiple wind boxes that make up the machine. The wind boxes located below the sintering machine pallets have many blind spots due to the surrounding equipment and structures, making it difficult to detect the location of air leaks not only by visual inspection, but also with various cameras such as sound source visualization cameras and thermal cameras. Furthermore, when using sound source visualization cameras, there is a lot of ultrasonic reflection from the surrounding equipment and structures, making it difficult to estimate the location.

[0007] For example, according to the method described in Patent Document 3, the location of air leakage can be detected relatively accurately for wind boxes equipped with gas sampling tubes. However, installing gas sampling tube sets in all wind boxes requires time and money. Furthermore, in the management of sintering machines, there are cases where it is desirable to comprehensively grasp and compare the location and extent of air leakage for multiple wind boxes constituting the sintering machine equipment in order to determine the scale and priority of repairs.

[0008] Therefore, the present invention has been made in consideration of the above problems, and an object of the present invention is to provide a gas component concentration measuring device and a gas component concentration measuring method used in a sintering machine facility, and a method for detecting air leakage in a sintering machine facility, which enable easy detection of air leakage in multiple wind boxes that make up the sintering machine facility. [Means for solving the problem]

[0009] In order to solve the above problems, according to one aspect of the present invention, there is provided a gas component concentration measuring device comprising: a plurality of gas sampling pipes provided below the raw material loading surface of a pallet that moves on an endless track of a sintering machine; and an analyzer that analyzes the component concentrations of the gas sampled from the gas sampling pipes, wherein the gas inlets of the gas sampling pipes are arranged in the height direction between the lower end of the pallet and the lower end of the grate bar that forms the raw material loading surface.

[0010] The gas sampling pipes may be arranged in each of the chambers formed by partitioning the pallet frame below the raw material placement surface of the pallet.

[0011] The analyzer may be mounted on the pallet.

[0012] In addition, in order to solve the above-mentioned problems, according to another aspect of the present invention, there is provided a gas component concentration measurement method in which at least one of a plurality of pallets moving on an endless track of a sintering machine is a gas sampling pallet having a plurality of gas sampling pipes provided below the raw material loading surface and a gas inlet arranged in the height direction between the lower end of the pallet and the lower end of the grate bar forming the raw material loading surface, and gas is sampled while the gas sampling pallet is moving during operation of the sintering machine, and the component concentrations of the sampled gas are analyzed using an analyzer connected to the gas sampling pipes.

[0013] Furthermore, in order to solve the above-mentioned problems, according to another aspect of the present invention, there is provided a method for detecting air leakage in a sintering machine, in which at least one of a plurality of pallets moving on an endless track of the sintering machine is a gas sampling pallet having a plurality of gas sampling pipes provided below the raw material loading surface and a gas inlet arranged vertically between the lower end of the pallet and the lower end of the grate bar forming the raw material loading surface, gas is sampled while the gas sampling pallet is moving during operation of the sintering machine, the component concentrations of the sampled gas are analyzed using an analyzer connected to the gas sampling pipes, and the presence or absence of air leakage in the wind box of the sintering machine is detected based on the oxygen concentration among the component concentrations of the analyzed gas.

[0014] At least one of the position and size of the hole in the wind box may be estimated based on the oxygen concentration of the gas sampled at the positions of a plurality of gas inlets arranged in parallel in the width direction of the gas sampling pallet. [Effects of the Invention]

[0015] As described above, according to the present invention, it is possible to easily detect air leakage from a plurality of wind boxes that constitute a sintering machine facility. [Brief explanation of the drawings]

[0016] [Figure 1] FIG. 1 is a schematic diagram showing a configuration example of a sintering machine facility according to an embodiment of the present invention. [Figure 2]FIG. 2 is a schematic front view showing an example of a pallet (gas sampling pallet) on which a gas sampling tube set constituting the gas component concentration measuring device according to the embodiment is installed. [Figure 3] FIG. 1 is an explanatory diagram showing an example of the arrangement of gas sampling pipes in a pallet (gas sampling pallet). [Figure 4] FIG. 2 is an explanatory diagram showing a configuration example of a gas component concentration measuring device according to the embodiment; [Figure 5] 10 is a simulation result showing the distribution of oxygen concentration when the pallet is viewed from the sidewall side. [Figure 6] 10 is a simulation result showing the distribution of oxygen concentration when the pallet is viewed from the front side. [Figure 7] As an example, a schematic diagram of the arrangement of wind boxes and the positions of rupture holes in a sintering machine and a graph of the oxygen concentration of gases sampled from gas inlets A to H are shown. [Figure 8] 10 is a graph showing the oxygen concentration of the gas collected from the gas inlet D. DETAILED DESCRIPTION OF THE INVENTION

[0017] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In this specification and drawings, components having substantially the same functional configurations are designated by the same reference numerals, and redundant explanations will be omitted.

[0018] [1. Equipment configuration] [1-1. Sintering machine equipment] First, the schematic configuration of a sintering machine 1 according to one embodiment of the present invention will be described with reference to Fig. 1. Fig. 1 is a schematic diagram showing an example of the configuration of a sintering machine 1 according to this embodiment. Note that Fig. 1 mainly shows the exhaust gas system of the sintering machine 1, which is related to the air leakage detection method according to this embodiment. In the following description, the direction in which the pallet 60 moves on the endless track is referred to as the travel direction, the vertical direction as the height direction, and the direction perpendicular to the travel direction and the height direction as the width direction. The width direction is the direction indicating the width of the endless track and is also the width direction of the pallet 60 installed in the sintering machine 1.

[0019] As shown in FIG. 1, the sintering machine equipment 1 according to this embodiment includes a sintering machine 10, a cooler 20, an electrostatic precipitator 30, an exhaust fan 40, and a chimney 50.

[0020] The sintering machine 10 is a facility in which raw materials are layered by loading them from a raw material hopper 11 onto multiple pallets 60 connected in the longitudinal direction, igniting them in an ignition furnace 13, and then burning the carbonaceous material contained in the raw materials while ventilating, using the resulting combustion heat to sinter the ore and slag-forming material. The pallets 60 rotate on rails 12. Note that in Fig. 1, only the upper side of the rails 12 is shown to clearly show the exhaust gas system, but the rails 12 in Fig. 1 form an endless track symmetrical from top to bottom. After passing through the ignition furnace 13, the combustion zone in the sintering raw material layer gradually propagates downward as the pallets 60 travel, producing sintered ore. The produced sintered ore drops into a cooler 20 at the right end of the sintering machine 10 and is cooled.

[0021] In the sintering machine 10, ventilation is sucked in from the wind box 15 below the pallet using the exhaust fan (blower) 40 downstream of the exhaust gas system as the driving force. This causes air to be drawn from the surface of the sintering raw material layer charged on the pallet and flow downward. The exhaust gas that flows into the wind box 15 passes through the wind legs 17 (wind legs 17A and 17B in FIG. 2 are collectively referred to as "wind legs 17") and the main duct 19, and is discharged to the electrostatic precipitator 30. After the dust in the exhaust gas is removed by the electrostatic precipitator 30, the exhaust gas passes through the exhaust fan 40 and is released from the chimney 50.

[0022] [1-2. Gas component concentration measuring device] Next, the configuration of the gas component concentration measuring device 100 according to this embodiment will be described with reference to Figures 2 to 4. Figure 2 is a schematic front view showing an example of a pallet (gas sampling pallet) 60 on which a gas sampling tube set 70 constituting the gas component concentration measuring device 100 according to this embodiment is installed. Figure 3 is an explanatory diagram showing an example of the arrangement of gas sampling tubes 71 on the pallet (gas sampling pallet) 60. Figure 4 is an explanatory diagram showing an example of the configuration of the gas component concentration measuring device 100 according to this embodiment.

[0023] In the sintering machine 1 according to this embodiment, at least one of the multiple pallets 60 moving on the endless track of the sintering machine 10 is a gas sampling pallet. The gas sampling pallet is equipped with multiple gas sampling pipes 71 that constitute the gas component concentration measuring device 100, and the gas sampled by the multiple gas sampling pipes 71 is sent to an analyzer that analyzes the component concentration of the gas. By sampling gas below the raw material loading surface while this gas sampling pallet is running during operation of the sintering machine 10, gas is sampled above all wind boxes 15 of the sintering machine 1, and the component concentration of the gas at the position of each wind box 15 can be measured. At this time, by measuring the oxygen concentration with an analyzer, it is possible to identify the wind box 15 with the largest air leakage.

[0024] As shown in Fig. 2, the pallet 60 has a pair of side walls 61, a pallet frame 63, and a plurality of grate bars 65. The side walls 61 are provided on both sides of the pallet 60 in the width direction (Y direction), and wheels 62 are rotatably provided on the outer side of the pallet 60. The wheels 62 mounted on the rails 12 rotate, causing the pallet 60 to move in the traveling direction (X direction). A plurality of grate bars 65 are laid between the pair of side walls 61, and a raw material placing surface 67 formed by the upper surfaces of the laid grate bars 65 forms the sintering raw material layer 5. The pallet frame 63 is a reinforcing member that reinforces the pallet 60 below the raw material placing surface 67.

[0025] The gas sampling pallet 60 further includes a gas sampling pipe set 70. The gas sampling pipe set 70 is composed of multiple gas sampling pipes 71. Each gas sampling pipe 71 is independent, and the gas sampled from the gas inlet 73 of each gas sampling pipe 71 is analyzed by an analyzer 80. The gas sampling pipes 71 near the sidewalls 61 can be supported by the sidewalls 61, but the gas sampling pipes 71 at the center of the width of the pallet 60 are installed in the gaps between the grate bars 65. Therefore, the gas sampling pipes 71 at the center of the width of the pallet 60 may be fixed to the pallet frame 63 with an L-shaped steel or other fixing member to prevent wear due to falling ore and to prevent misalignment. The more gas sampling pipes 71 are installed and the more gas is sampled at various positions when the pallet 60 is viewed in a plan view from the Z direction, the more accurately the rupture position of the wind box 15 can be detected.

[0026] The space V below the raw material loading surface 67 of the pallet 60 is partitioned by the pallet frame 63 to form multiple rooms. For this reason, in the rooms corresponding to the positions of the holes in the wind box 15, the leaking air diffuses and the oxygen concentration becomes high, but in the rooms not corresponding to the positions of the holes in the wind box 15, the leaking air does not diffuse and the oxygen concentration is low. Therefore, by arranging the gas inlet 73 of the gas sampling pipe 71 in each of the rooms formed by partitioning with the pallet frame 63, the positions of the holes in the wind box 15 can be detected efficiently.

[0027] For example, as shown in FIG. 3, when the pallet 60 is viewed from above in the Z direction, seven pallet frames 63x are arranged along the travel direction (X direction) and one pallet frame 63y is arranged along the width direction (Y direction). In this case, 16 rooms v11 to v18, v21 to v28 are formed on the pallet 60. Therefore, in the example of FIG. 3, the gas sampling pipes 71 may be provided so that a gas inlet 73 is disposed in each of the rooms v11 to v18, v21 to v28. Note that it is sufficient that multiple gas inlets 73 are disposed at least across the width direction, and multiple gas inlets 73 do not necessarily have to be disposed in the travel direction. For example, in FIG. 3, the gas inlets 73 may be disposed in only one of the rooms v11 to v14, v21 to v24, or the rooms v15 to v18, v25 to v28.

[0028] As shown in FIG. 4, the gas inlet 73 of the gas sampling pipe 71 is positioned in the height direction (Z direction) between the bottom end of the pallet 60 and the bottom end of the grate bar 65 that forms the raw material loading surface 67. By positioning the gas inlet 73 of the gas sampling pipe 71 at this height position, air leakage from the wind box 15 can be reliably detected. The closer the height position of the gas inlet 73 is to the bottom end of the pallet 60, the higher the accuracy of detecting air leakage from the wind box 15. When the height position of the bottom end of the pallet 60 is "0" and the height position of the bottom end of the grate bar 65 is "1," the height position of the gas inlet 73 is preferably 0.5 or less, and the closer to 0 the better.

[0029] The gas sampled from the gas inlet 73 passes through the gas sampling pipe 71 and is sent to an analyzer 80, which analyzes the concentration of gas components. When detecting air leakage from the wind box 15, an oxygen concentration meter is used as the analyzer 80. There are no particular limitations on the type of oxygen concentration meter, and any type of oxygen concentration meter can be used, such as a zirconia oxygen concentration meter, a laser oxygen concentration meter, a magnetic oxygen concentration meter, or a galvanic battery oxygen concentration meter.

[0030] Magnetic oxygen analyzers and galvanic cell oxygen analyzers require a pre-treatment process to remove moisture, dust, and the like from the exhaust gas before sampling and measuring the oxygen concentration. Therefore, when using a magnetic oxygen analyzer or galvanic cell oxygen analyzer, a pre-treatment device 85 is installed as shown in Figure 4. Pre-treatment device 85 consists of, for example, a dust filter or a moisture absorbent such as calcium chloride. On the other hand, zirconia oxygen analyzers and laser oxygen analyzers do not require a pre-treatment process, so there is no need to install pre-treatment device 85.

[0031] The analyzer 80 (and pre-processing device 85, if necessary) may be a portable device that can be attached to and detached from the pallet 60, or a large device that is fixed to the floor of the facility (see, for example, Japanese Patent Application Laid-Open No. 9-310125). In the case of a portable device, the device is attached to the pallet 60 (e.g., the outer surface of the sidewall 61) before starting measurement and is removed from the pallet 60 after measurement is completed. In the case of a large device, the analyzer 80 (or pre-processing device 85) fixed to the floor of the facility is connected to the gas sampling pipe 71 on the pallet 60 by piping such as a hose. Before starting measurement, the analyzer 80 (or pre-processing device 85) and the gas sampling pipe 71 on the pallet 60 are connected by piping, and after measurement is completed, the piping is removed. In either case, measurement can be easily performed. However, in the case of a portable device, the distance between the gas sampling position and the analyzer 80 is shorter than in the case of a large device, so the time lag from gas sampling to analysis is shorter and the analysis accuracy is higher.

[0032] [2. Air leak detection in sintering equipment] In order to easily detect air leakage from the multiple wind boxes 15 that make up the sintering machine equipment 1, in this embodiment, at least one gas sampling palette is installed in the sintering machine 10 and moved to sample exhaust gas from each of the multiple wind boxes 15 and analyze the oxygen concentration. This makes it possible to comprehensively grasp the location and extent of air leakage from the multiple wind boxes 15.

[0033] Figures 5 and 6 show an example of the results of a simulation of wind box air leakage using numerical analysis. Figure 5 is a simulation result showing the distribution of oxygen concentration when the pallet is viewed from the sidewall side, and Figure 6 is a simulation result showing the distribution of oxygen concentration when the pallet is viewed from the front side. In Figures 5 and 6, the darker the color, the higher the oxygen concentration. White indicates an oxygen concentration of 0%, and black indicates an oxygen concentration of 10%. In the simulation, it was assumed that there was a hole (small hole) H1 at the boundary position of adjacent wind boxes in the traveling direction (X direction), and that there was a hole (large hole) H2 at the boundary between the wind box and the wind leg.

[0034] 5 and 6, it can be seen that the oxygen concentration is high near the positions of the wind box break holes H1 and H2 between the bottom end of the pallet on the pallet side and the bottom end of the grate bar. Furthermore, because break hole H2 is larger than break hole H1, it can be seen that the leaking air diffuses to the bottom end of the grate bar, maintaining a high oxygen concentration until it reaches the grate bar. The wind box leaking air flows vertically upward, and its flow velocity is fast. Therefore, it is thought that the oxygen concentration on the pallet side also changes due to the wind box leaking air. These results suggest that if the oxygen concentration at each wind box position is measured using the gas sampling pallet of this embodiment, it is possible to detect wind box leaks from the high oxygen concentration.

[0035] Specifically, for example, the oxygen concentration during normal times when there is no wind box air leakage is acquired in advance as a reference oxygen concentration, and the oxygen concentration measured while the gas sampling pallet is running is compared with the reference oxygen concentration. When the measured oxygen concentration is higher than the reference oxygen concentration by a predetermined amount or more, it is possible to detect wind box air leakage. It is also possible to compare previously measured oxygen concentrations with the most recent measured oxygen concentration and detect wind box air leakage based on the increasing trend of the oxygen concentration.

[0036] Furthermore, Figure 6 confirms that when there is a large amount of air leakage, the oxygen concentration rises not only directly above the leak point but also over a wide range across the width of the pallet. Therefore, the size of the hole can be estimated by comparing the oxygen concentrations of the gas sampled at the positions of multiple gas inlets 73 arranged in parallel across the width of the pallet.

[0037] The above describes a gas component concentration measuring device, a gas component concentration measuring method, and an air leak detection method for a sintering machine according to one embodiment of the present invention. The gas component concentration measuring device according to this embodiment includes multiple gas sampling tubes installed below the raw material loading surface of a pallet moving on an endless track in a sintering machine, and an analyzer for analyzing the component concentrations of gas sampled from the gas sampling tubes. The gas inlets of the gas sampling tubes are positioned vertically between the bottom end of the pallet and the bottom end of the grate bar. By analyzing the oxygen concentration of the gas sampled by these gas sampling tubes, changes in oxygen concentration due to air leakage from the wind box can be detected, and the location of air leakage from the wind box can be identified. Furthermore, since the oxygen concentration can be measured across the width of multiple wind boxes while the gas sampling pallet is moving during operation, air leakage from multiple wind boxes can be easily detected. [Example]

[0038] The results of applying the present invention to the Dwight Lloyd sinter machine shown in Figure 1 are shown in Figures 7 and 8. The upper part of Figure 7 shows a schematic diagram of the arrangement of the sixth wind box (#6) to the tenth wind box (#10) in the sinter machine equipment, as well as the positions of the break holes. The break holes were visually confirmed by a worker when repairing the wind boxes. The sixth wind box (#6) is located at the ignition furnace position, and the gas sampling pallet moves from the sixth wind box (#6) on the ore supply side toward the tenth wind box (#10) on the ore discharge side. Gas inlets A to H are arranged across the width of the gas sampling pallet.

[0039] The lower part of Figure 7 shows the analysis results of the oxygen concentration of the gas sampled from gas inlets A to H. As shown in the lower part of Figure 7, the oxygen concentration is high where there are holes in the wind boxes, such as between the sixth wind box (#6) and the seventh wind box (#7) and between the seventh wind box (#7) and the eighth wind box (#8). Furthermore, the oxygen concentration of the gas sampled at gas inlet H was high on the discharge side of the tenth wind box (#10). No holes were visible to the naked eye at these locations, but it is possible that there may be a source of air leakage in a location that cannot be seen with the naked eye.

[0040] Figure 8 shows the change in oxygen concentration of the gas sampled at the gas inlet D in the section from the sixth wind box (#6) to the twentieth wind box (#20). The oxygen concentration is usually 5-7% at the outlet of the ignition furnace and rises to about 20% as it approaches the ore discharge position. The oxygen concentration measurement results shown in Figure 8 show that the oxygen concentration rises locally at the seventh wind box (#7) and the twelfth wind box (#12) to the fourteenth wind box (#14). At these localized oxygen concentration locations, holes were visually confirmed in the wind boxes.

[0041] Thus, it is clear that the possibility of air leakage from the wind box can be detected from the measured oxygen concentration.

[0042] Although the preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, the present invention is not limited to these examples. It is clear that a person skilled in the art to which the present invention pertains can conceive of various modifications and alterations within the scope of the technical ideas set forth in the claims, and it is understood that these also naturally fall within the technical scope of the present invention.

[0043] For example, in the above embodiment, the analyzer of the gas component concentration measuring device analyzed the oxygen concentration, but the present invention is not limited to this example, and the analyzer may analyze the components of other gases such as carbon dioxide (CO2) and carbon monoxide (CO). For example, Japanese Patent Laid-Open Publication No. 9-310125 discloses that by analyzing such gas components, the analysis results can be fed back to adjust the particle size and blending ratio of the raw materials, control fuel segregation, etc., thereby improving quality, yield, and energy efficiency. [Explanation of symbols]

[0044] 1. Sintering machine equipment 5 Sintering raw material layer 10. Sintering machine 11 Raw material hopper 12 Rails 13 Ignition furnace 15 Windbox 17A, 17B wind leg 19 Main duct 20 Cooler 30 Electrostatic Precipitator 40 Blower 50 Chimney 60 pallets 61 Sidewall 62 wheels 63 Pallet Frame 65 Great Bar 67 Raw material placement surface 70 Gas Sampling Tube Set 71 Gas sampling tube 73 Gas inlet 80 Analyzer 85 Pretreatment equipment 100 Gas component concentration measuring device

Claims

1. a plurality of gas sampling pipes provided below the raw material placement surface of a pallet that moves on an endless track of the sintering machine; an analyzer for analyzing the component concentrations of the gas collected from the gas collection tube; Equipped with a gas inlet of the gas sampling pipe is disposed in a height direction between a lower end of the pallet and a lower end of a grate bar forming the raw material placing surface; The gas component concentration measuring device, wherein the gas sampling pipes are arranged in each of the rooms formed by partitioning the pallet frame below the raw material placement surface of the pallet.

2. A gas component concentration measuring device as described in Claim 1, wherein when the height position of the lower end of the pallet is "0" and the height position of the lower end of the grate bar is "1", the height position of the gas intake port is 0.5 or less.

3. 3. The gas component concentration measuring device according to claim 1, wherein the analyzer is provided on the pallet.

4. At least one of the plurality of pallets moving on the endless track of the sintering machine is a gas sampling pallet having a plurality of gas sampling pipes provided below the raw material loading surface and a gas inlet disposed between the lower end of the pallet and the lower end of a grate bar forming the raw material loading surface in the height direction, The gas sampling pipes are arranged in the respective chambers formed by partitioning the chambers by the pallet frame below the raw material placing surface of the pallet, a gas sampling pallet running during operation of the sintering machine to sample gas, and an analyzer connected to the gas sampling pipe to analyze the component concentrations of the sampled gas.

5. At least one of the plurality of pallets moving on the endless track of the sintering machine is a gas sampling pallet having a plurality of gas sampling pipes provided below the raw material loading surface and a gas inlet disposed between the lower end of the pallet and the lower end of a grate bar forming the raw material loading surface in the height direction, The gas sampling pipes are arranged in the respective chambers formed by partitioning the chambers by the pallet frame below the raw material placing surface of the pallet, sampling gas while moving the gas sampling pallet during operation of the sintering machine, and analyzing the component concentrations of the sampled gas using an analyzer connected to the gas sampling pipe; A method for detecting air leakage in a sintering machine facility, which detects the presence or absence of air leakage in the wind box of the sintering machine based on the oxygen concentration among the component concentrations of the analyzed gas.

6. 6. The method for detecting air leakage in a sintering machine according to claim 5, wherein at least one of the position and the size of a hole in the wind box is estimated based on the oxygen concentrations of gases collected at positions of the plurality of gas inlets arranged side by side in the width direction of the gas collection pallet.

Images