Recovery device of coal-based recovered article and suction work vehicle

Abstract

To provide a recovery device of a coal-based recovered article and a suction work vehicle which suppress dust emission during discharge, and improve a recycling rate of a coal-based recovered article stored in a receiver tank.SOLUTION: A recovery device of a coal-based recovered article includes a receiver tank 31 which sucks a coal-based recovered article 100 through a suction part 300 using a suction device 4, and stores the sucked coal-based recovered article 200, a filter 90 which is connected to the receiver tank 31 and collects a non-recovered coal-based recovered article 200 that is not stored in the receiver tank 31, wherein a water addition device 5 is provided on the suction part 300, and the water addition device 5 adds water to the coal-based recovered article 100 so that a moisture content of the non-recovered coal-based recovered article 200 stored in the receiver tank 31 is more than 2 wt.% and equal to or less 20 wt.%.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a coal-based recovered material recovery device and a suction work vehicle. [Background technology]

[0002] Conventionally, there has been a suction work vehicle that is equipped with a suction device that uses a suction hose to suck up materials at a suction work site and store them in a receiver tank, a number of sensors that monitor the status of the suction work, an operating device that is connected to the sensors and the suction device and operates the suction device, and a remote operating device that is capable of remote communication with the operating device, and is characterized in that the suction operation is stopped by shaking the remote operating device (see Patent Document 1 below). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-75247 Summary of the Invention [Problem to be solved by the invention]

[0004] The above-mentioned Patent Document 1 does not disclose a recovery device that suppresses dust generation during discharge and improves the reuse rate of coal-based recovered material stored in a receiver tank, nor a suction work vehicle equipped with the recovery device.

[0005] The present disclosure discloses technology for solving the problems described above, and aims to provide a coal-based recovered material recovery device that suppresses dust generation during discharge and improves the reuse rate of coal-based recovered material stored in a receiver tank, and a suction work vehicle equipped with the recovery device. [Means for solving the problem]

[0006] The coal-based recovery material recovery device according to the present disclosure comprises: A receiver tank that receives the coal-based recovered material by sucking the coal-based recovered material through the suction unit using a suction device; A coal-based recovery material recovery device comprising: a filter connected to the receiver tank and configured to collect unrecovered coal-based recovery material that is not accommodated in the receiver tank; The suction section is provided with a water adder, which adds water to the coal-based recovered material so that the moisture content of the coal-based recovered material contained in the receiver tank is more than 2 weight percent and not more than 20 weight percent. The suction work vehicle according to the present disclosure is equipped with the coal-based recovered material recovery device. Effect of the Invention

[0007] According to the coal-based recovered material recovery device and suction work vehicle disclosed herein, dust generation during discharge can be suppressed and the reuse rate of the coal-based recovered material stored in the receiver tank can be improved. [Brief description of the drawings]

[0008] [Figure 1] 1 is a schematic configuration diagram showing a coal-based recovered material recovery device according to an embodiment. [Diagram 2] FIG. 2 is an enlarged configuration diagram of a receiver tank of the coal-based recovered material recovery device according to the embodiment. [Diagram 3] 1A to 1C are diagrams showing the open and closed states of the valves during wet suction, semi-dry suction, and pressure transfer of the recovered material by the coal-based recovered material recovery device according to the embodiment. [Figure 4] FIG. 4A is a diagram showing an example of a jet-type water adder according to the embodiment, and FIG. 4B is a diagram showing an example of a spray-type water adder according to the embodiment. [Diagram 5] FIG. 13 is a diagram showing a state in which a chain is attached as an example of a homogenizing and dispersing mechanism for coal-based recovered material according to the embodiment. [Figure 6] 13A and 13B are diagrams illustrating the function of a chain that is an equalizing and dispersing mechanism in the suction work vehicle according to the embodiment. [Figure 7]7A and 7B are a plan view and a half-sectional side view showing a rupture disk provided in a receiver tank according to an embodiment. [Figure 8] 8A and 8B are schematic views showing the configuration of a filter according to an embodiment, in which FIG. 8A is a schematic oblique view showing the filter, FIG. 8B is a schematic cross-sectional view of part C in FIG. 8A, and FIG. 8C is a view showing how powder and granular material are captured by the filter in FIG. 8B. [Figure 9] 11A and 11B are diagrams illustrating the difference in effect between the semi-dry suction operation and the wet suction operation according to the embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] [Purpose of this disclosure] In coke ovens in steelworks, coal dust particles emitted from the furnace body or conveyor are collected by a dust collector. A suction work vehicle is used to collect the coal dust particles collected by the dust collector (hereinafter referred to as coal-based collected material). This suction work vehicle is equipped with a collection device that uses a suction hose to suck up the coal-based collected material and stores it in a receiver tank as coal-based collected material. The suction work vehicle is also equipped with a catcher and a filter to collect powder that could not be collected in the receiver tank.

[0010] When collecting coal dust powder (coal-based collected material) using a suction work vehicle with such a configuration, dust is generated, which causes environmental pollution. The coal dust powder (coal-based collected material) collected by the above-mentioned dust collector has a moisture content of, for example, approximately 2% by weight or less, so dust is likely to be generated. In order to prevent this, it is possible to add water to the coal-based collected material and collect it. As a result of experiments by the inventors, it was found that dust generation was suppressed when the ratio of the suctioned coal-based collected material to water was set to 3:7, but there was a problem that the added water and the coal-based collected material were not mixed uniformly, and the reuse rate of the coal-based collected material stored in the receiver tank did not increase.

[0011] In addition, when coal-based recovered material with a high moisture content was stored inside the receiver tank, about 1 / 4 of the coal-based recovered material would stick to the inside of the receiver tank, and manual labor was required to remove the stuck material to the outside. Furthermore, a bag filter was generally used to capture the uncollected powder that was discharged from the receiver tank and could not be collected by a catcher, etc., but when coal-based recovered material with a high moisture content was sucked in, it would stick to the bag filter cloth, drastically reducing the suction power. The present disclosure has been made to solve the above-mentioned problems, and embodiments of the present disclosure will be described in detail below.

[0012] [Description of the embodiment] (Configuration of coal-based recovery equipment) FIG. 1 is a schematic diagram showing a recovery apparatus for coal-based recovered material according to an embodiment, and FIG. 2 is an enlarged diagram showing a receiver tank of the recovery apparatus for coal-based recovered material according to the embodiment. As shown in FIG. 6, which will be described later, in this embodiment, the coal-based recovered material recovery device 1000 is mounted on a suction work vehicle 2000.

[0013] First, with reference to FIG. 1, the overall configuration of a coal-based recovered material recovery device according to an embodiment will be described. As shown in the figure, the recovery device 1000 includes a suction hose 2 that sucks up the coal-based recovery material 100 (hereinafter referred to as the recovery material 100), a suction port 310 to which the suction hose 2 is connected, a water adding device 5 installed on the suction hose 2 or the suction port 310, a receiver tank 31 that stores the coal-based recovery material 200 (hereinafter referred to as the recovery material 200) sucked through the suction hose 2 and the suction port 310, a secondary catcher 32 that is disposed downstream of the receiver tank 31 and connected by a pipe L1, and a secondary catcher 33 that is disposed downstream of the receiver tank 31 and connected by a pipe L2. The system includes a tertiary catcher 33 disposed downstream of the catcher 32 and connected by pipes L20, L21, L22, L23, and L25, a first filter device 71 and a second filter device 72 installed between the secondary catcher 32 and the tertiary catcher 33, a suction device 4 (first stage blower 41 and second stage blower 42) disposed downstream of the tertiary catcher 33 and connected by pipe L3, and a fourth catcher 34 disposed downstream of the suction device 4 and connected by pipe L5. An opening 34a is provided in the fourth catcher 34 to discharge gas components. In this embodiment, the suction hose 2 and the suction port 310 are collectively referred to as a suction unit 300.

[0014] As described above, the suction unit 300 (the suction hose 2 or the suction port 310) is provided with the water adder 5, which adds a predetermined amount of moisture to the material 100 to be collected that is being sucked in, as described later. A first filter device 71 and a second filter device 72 are installed between the secondary catcher 32 and the tertiary catcher 33, and collect coal-based recovered materials (powders, etc.) that have not accumulated inside the receiver tank 31 and have not been collected.

[0015] Next, the configuration of the receiver tank of the recovery device will be described with reference to FIG. As shown in the figure, the receiver tank 31 is composed of a main body 311 and a lid 312, and the lid 312 opens and closes upward about a fulcrum 312A. When discharging the collected material 200 accumulated in the receiver tank 31, the lid 312 is opened, the side of the main body 311 other than the lid (the left side in FIG. 2) is lifted using a cylinder (not shown), and the receiver tank 31 is tilted to discharge the collected material 200.

[0016] The suction hose 2 is connected to a suction port 310 of the lid 312, and a suction valve V01 is provided at the suction port 310. The collected material 200 sucked through the suction hose 2 and the suction port 310 collides with the contact plate 330, and then collides with multiple metal chains 7, and is uniformly and dispersedly deposited at the bottom of the receiver tank 31. As will be described later, the multiple chains 7 are referred to as a mechanism for uniformly dispersing the collected material 200. If the specific gravity of the collected material 200 is light, without the chain 7 as a uniformly dispersing mechanism, the material would tend to pile up unevenly at the front side of the receiver tank 31 (the left side in Figure 2). Therefore, by hanging the chain 7 as a uniformly dispersing mechanism above the center of the receiver tank 31, it can function as a baffle plate.

[0017] The lid 312 also has a discharge port 320 for discharging the collected material 200 in the receiver tank 31 to the outside of the receiver tank 31, and the discharge port 320 is provided with a valve V02. Furthermore, the receiver tank 31 is provided with a fill ball 340 and a bursting disk 6 .

[0018] Returning to FIG. 1, the overall configuration of the recovery device will be described. The secondary catcher 32 is connected to the downstream side of the receiver tank 31 via a pipe L1. A valve V1 is provided in the pipe L1. A pipe L11 that is connected to the downstream side of the second stage blower 42 branches off from the pipe L1, and a valve V2 is provided in the pipe L11. The secondary catcher 32 is a cyclone type dust collector, and captures fine solid matter that has not been collected in the receiver tank 31.

[0019] A first filter device 71 and a second filter device 72 are installed between the secondary catcher 32 and the tertiary catcher 33, as described below, to collect coal-based recovered materials (powders) that are not collected in the secondary catcher 32.

[0020] The tertiary catcher 33 is connected to the downstream side of the secondary catcher 32 and the first and second filter devices 71 and 72 via a pipe L25. The tertiary catcher 33 is connected to a first stage blower 41 via a pipe L3, and is further connected to a second stage blower 42 via a pipe L4. The second stage blower 42 is connected to a fourth catcher 34 via a pipe L5 and a discharge silencer S1, and gas components are discharged from an opening 34a of the fourth catcher 34.

[0021] The tertiary catcher 33 is a wet dust collection tank that stores a predetermined amount of water. Air from the pipe L25 is blown into the water in the tertiary catcher 33, and fine solid matter that was not captured by the secondary catcher 32 is captured.

[0022] The first stage blower 41 is connected to the downstream side of the tertiary catcher 33 by a pipe L3. The second stage blower 42 is connected to the downstream side of the first stage blower 41 by a pipe L4. A pipe L41 that is connected to a pipe L5 described later branches off from the pipe L4, and a check valve NRV is provided in the pipe L41. The first stage blower 41 and the second stage blower 42 are driven by the drive engine of the suction work vehicle 2000, another engine, a power source, or the like.

[0023] The quaternary catcher 34 is connected to the downstream side of the second stage blower 42 by a pipe L5. A valve V3 is provided in the pipe L5. The pipe L5 is connected to a pressure breaker PB at two points, the upstream side and the downstream side of the valve V3, and is released to the atmosphere when the pressure exceeds a predetermined pressure.

[0024] The quaternary catcher 34 is a wet dust collection tank that stores a predetermined amount of water, and captures fine solid matter that has not been captured by the tertiary catcher 33. The quaternary catcher 34 has an opening 34a, and the air sent from the second stage blower 42 is discharged from the opening 34a. The pipe L5 connected to the fourth catcher 34 is provided with a discharge silencer S1 for reducing exhaust noise.

[0025] (Explanation of the operation of the recovery device) Next, the suction operation by the recovery device of this embodiment will be described. The recovery device of this embodiment can select either a semi-dry suction operation or a wet suction operation. Here, the semi-dry suction operation refers to the operation of sucking up the collected material while adding water to it from a water adder provided in the suction section so that the moisture content of the collected material contained in the receiver tank is more than 2 weight percent and not more than 20 weight percent. In addition, the wet suction operation refers to the operation of sucking up the collected material while adding water to the collected material from a water adder provided in the suction section so that the moisture content of the collected material contained in the receiver tank is more than 20 weight percent. In this embodiment, the semi-dry suction operation is the main suction operation, and the wet suction operation is an auxiliary suction operation.

[0026] The wet suction operation and the semi-dry suction operation by the recovery device of this embodiment will be described below. Also, the pumping operation of the coal-based recovered material and the flow of the cooling water will be described. FIG. 3 is a diagram showing the open / closed states of the valves during wet suction, semi-dry suction, and pressure transfer of the collected material by the recovery device of this embodiment.

[0027] (Wet suction operation) During wet suction by the recovery device, the suction valve V01 is opened, valve V1 is opened, valve V2 is closed, valve V3 is opened, valve V4 is opened, valve V5 is changed from open to closed, valve V6 is closed, valve V7 is closed, valve V8 is closed, valve V9 is closed, and valve V10 is closed, and the first stage blower 41 and the second stage blower 42 are driven. The collected material 100 is sent in the following order: suction section 300, receiver tank 31, pipe L1, secondary catcher 32, pipe L20, pipe L22, pipe L25, tertiary catcher 33, pipe L3, first stage blower 41, pipe L4, second stage blower 42, pipe L5, and fourth catcher 34. As described above, during wet suction, the suctioned collected material 200 does not pass through the first filter device 71 and the second filter device 72.

[0028] (Semi-dry suction operation) During semi-dry suction by the recovery device, the suction valve V01 is opened, valve V1 is opened, valve V2 is closed, valve V3 is opened, valve V4 is closed, valve V5 is changed from open to closed, valve V6 is closed, valve V7 is opened, valve V8 is opened, valve V9 is opened, and valve V10 is opened, and the first stage blower 41 and the second stage blower 42 are driven. The collected material 100 is sent in the following order: suction section 300, receiver tank 31, pipe L1, secondary catcher 32, pipe L20, pipe L21, first filter device 71 and second filter device 72, pipe L23, pipe L25, tertiary catcher 33, pipe L3, first stage blower 41, pipe L4, second stage blower 42, pipe L5, and fourth catcher 34. As described above, during semi-dry suction, the suctioned collected material 200 passes through the first filter device 71 and the second filter device 72.

[0029] (Pumping operation of collected materials) When pumping the collected material 200, the suction valve V01 is closed, the valve V1 is closed, the valve V2 is opened, the valve V3 is closed, the valve V5 is opened, and the valve V6 is opened, and the first stage blower 41 and the second stage blower 42 are driven. The air taken in through the suction silencer S2 and the vacuum breaker VB is sent into the receiver tank 31 via the valves V5 and V6, the tertiary catcher 33, the pipe L3, the first stage blower 41, the pipe L4, the second stage blower 42, the pipe L11, and the valve V2, and the collected material 200 in the receiver tank 31 is sent to the outside through the discharge port 320.

[0030] (cooling water flow) The flow of cooling water for cooling the suction device 4 is such that water from the fourth catcher 34 flows through pipe L10, the first stage blower 41, pipe L4, the second stage blower 42, and pipe L5, and returns to the fourth catcher 34.

[0031] (Explanation of the water dispenser) Next, the structure and effect of the water adding device disposed in the suction section will be described. The water adder 5 of this embodiment is used during semi-dry suction and adds water to the collected material 100 so that the moisture content of the collected material 200 contained in the receiver tank 31 is more than 2 weight percent and not more than 20 weight percent, preferably more than 6 weight percent and not more than 10 weight percent, and so that the collected material 200 and the moisture are uniformly mixed. During wet suction, the water adding device 5 of this embodiment is removed, and a water adding hose connected to a water supply, for example, is attached to the suction part 300, and water is added to the collected material 100 in the suction part 300 from the water adding hose.

[0032] FIG. 4A is a diagram showing an example of a jet-type water adding device according to an embodiment, and is a diagram showing a cross section of the jet-type water adding device as viewed from above. The jet-type water adder 5A shown in Fig. 4A has nozzles with jet ports 50 with a hole diameter of φ5.5 mm provided at multiple locations on the inner peripheral surface of the suction port 310. Water 50A is jetted from the multiple jet ports 50 toward the center to increase the water content of the material 100 being sucked in. For example, when the suction speed of the material 100 is 80,000 (L / min), the recovery rate of the material 200 is significantly improved by adding 15 (L / min), as shown in Fig. 9 described later.

[0033] FIG. 4B is a plan view showing an example of a spray-type water adding device according to an embodiment, and a side cross-sectional view showing the spraying state of the spray-type water adding device. 4B is composed of a spray-type hollow cone nozzle 51, and is arranged so that the spray port of the hollow cone nozzle 51 is located at the center of the hole diameter of the suction port 310. This hollow cone nozzle 51 produces stable spray regardless of the level of liquid pressure, and can generate hollow cone spray 51A with a circular spray pattern and relatively fine particle diameters. The spray direction of the hollow cone nozzle 51 in this embodiment is set to the same direction as the direction 100A in which the material 100 to be collected is sucked in. It has been confirmed that the hollow-cone nozzle 51 used in this embodiment can produce the smallest water droplets (650 μm) at normal tap water pressure (0.2 MPa). As described above, by using the spray type water adder 5B, the opportunities for the sucked material to be collected 100 to bind with moisture are increased, and the moisture content of the material to be collected 100 can be increased uniformly.

[0034] In the recovery method by wet suction, as shown in Fig. 9 described later, water is added to the material 100 to be recovered at a rate of 140 (L / min), and a wet slurry with a moisture content of 56 wt% is recovered as the recovered material 200. Because the moisture content of the recovered wet material 200 is high, it is difficult to reuse it as a coal-based recovered material. In contrast, in the semi-dry recovery method, by using the jet-type water adder of FIG. 4A or the spray-type water adder of FIG. 4B, the recovered material 200 can be made into a powder or granular material that is moist enough not to generate dust and is easy to handle. That is, by using the jet type water adder of Fig. 4A or the spray type water adder of Fig. 4B, the amount of water added to the collected material 100 is reduced to 5 L / min to 50 L / min (semi-dry suction) as shown in Fig. 9 described later, and the moisture content of the collected material 200 is 2 wt% to 20 wt%, which is a moist, easy-to-handle powder that does not generate dust. In particular, by making the moisture content of the collected material 200 6 wt% to 10 wt%, it becomes a moist, easy-to-handle powder that does not generate dust, and the reuse rate of the collected material 200 can be increased.

[0035] (Explanation of the homogenization and dispersion mechanism) FIG. 5 is a diagram showing a state in which a chain is attached as an example of a homogenizing and dispersing mechanism for coal-based recovered material according to the embodiment. FIG. 6 is a diagram illustrating the function of the chain, which is the uniform distribution mechanism, in the suction work vehicle according to the embodiment. FIG. 5 shows a state in which a plurality of chains 7 are attached inside a receiver tank 31 as an example of a mechanism for homogenizing and dispersing collected material 200 sucked from a suction unit 300. 5 and 6, collected material 200 sucked into receiver tank 31 through suction hose 2 and suction port 310 collides with abutment plate 330 disposed at the top of receiver tank 31, then collides with chain 7, which is a homogenizing and dispersing mechanism suspended from the top of receiver tank 31, and falls to the bottom of receiver tank 31 and is collected. In this case, collected material 200 collides with multiple chains 7 made of metal or the like, so that collected material 200 can be piled up evenly and dispersed at the bottom of receiver tank 31. Furthermore, as shown in FIG. 6, by tilting the bottom of the receiver tank 31 on the suction section 300 side downward when suctioning the collected material 200, the collected material 200 can be further deposited in an evenly and dispersed manner on the bottom of the receiver tank 31.

[0036] (Explanation of the rupture disk) Next, the rupture disk installed in the receiver tank will be described. 7A and 7B are a plan view and a half-sectional side view showing a rupture disk installed in a receiver tank. 7A and 7B includes a rupture disk body 61, a flange 60 to which the rupture disk body 61 is attached, and a cover 62 to protect the rupture disk body 61 and the flange 60. The rupture disk 6 is attached to the receiver tank 31 by bolts or the like. The rupture disk 6 shown in Figs. 7A and 7B serves the role of releasing gas into the atmosphere by rupturing the rupture disk body 61 when the gas pressure inside the receiver tank 31 exceeds a specified value. In addition, a dedicated earth wire (not shown) is installed in the receiver tank 31. When the collected material 200 is pulverized coal or the like, the electric charge caused by the spark discharge from the collected material 200 can be discharged to the outside through the dedicated earth wire.

[0037] (Filter Description) FIG. 8 is a diagram illustrating a filter that captures uncollected materials (powders and granular materials, etc.) discharged from the receiver tank, and the filter is installed in the first filter device 71 and the second filter device 72 shown in FIG. In Figure 8, Figure 8A is a schematic perspective view showing the filter of the present embodiment, Figure 8B is a schematic cross-sectional view of part C in Figure 8A, and Figure 8C is a view showing how powder and granular material are captured by the filter in Figure 8B.

[0038] Conventional bag filters are designed to suck up dry powder and the like, but when wet dust and the like is sucked in, the dust sticks to the bag filter fabric, reducing the suction power. To avoid this, in this embodiment, a filter is used in which a resin coating layer having second holes smaller than the first holes is applied to the surface of a base material having first holes made of a resin sintered body. In particular, as shown in Fig. 8, a sinter lamellar filter (registered trademark of Nittetsu Mining Co., Ltd.) was adopted as the filter 90. This sinter lamellar filter (registered trademark) has a fluoride resin coating layer 91 on the surface of a corrugated base material 92 made by sintering several kinds of materials, which has good releasability against collected powder 94, hydrophobicity to prevent adhesion of coal-based recovered material with high moisture content, and excellent brushing function. The base material 92 of the Sinter Lamellar Filter (registered trademark) is made of a polymer sintered body, and has voids of about 40 μm arranged on average inside. A fluoride resin coating layer 91 is applied to the surface of the base material 92, and the coating layer forms voids of 3 to 4 μm, so that powder 93 is collected with extremely high efficiency and becomes collected powder 94, which is brushed off and does not flow into the inside of the filter. Furthermore, this filter 90 is a self-supporting type that can support itself, and does not require the retainer metal fittings for holding the filter body that are necessary in conventional bag filters. As described above, by employing the filter of this embodiment, even wet powder / granular material 93 can be collected, and the generation of static electricity can be suppressed. The filter 90 used in the first filter device 71 and the second filter device 72 is not limited to a Sinter Lamellar Filter (registered trademark), but may be any filter that has good peelability against the collected powder 94 and has hydrophobicity that prevents adhesion of coal-based recovered material with high moisture content.

[0039] (Coal-based recovered material brush-off device) In this embodiment, as shown in FIG. 1, a brush-off device 82 is installed outside the receiver tank 31 to apply an impact to the receiver tank 31 to cause the coal-based recovered material 200 (wet powder material) adhering to the inner wall of the receiver tank 31 to fall off. Here, as the knock-off device 82, for example, an air-type knocker is used, which uses compressed air and magnetic force to make a piston give a strong impact on the receiver tank 31, and the resulting vibration knocks off the coal-based recovered material 200 adhering to the inner wall of the receiver tank 31. Furthermore, in this embodiment, the inner surface of the receiver tank 31 is polished (smoothed) to improve the slipperiness of the coal-based collected material 200 when the coal-based collected material 200 is discharged. In addition, by combining with the brushing device 82, the problem of the adhesion of the inner surface of the receiver tank 31 when the coal-based collected material 200 is discharged is completely solved, and it becomes possible to omit the manual scraping work by entering the receiver tank 31.

[0040] (Effects of the embodiment) Next, the difference in effect between the semi-dry suction operation and the wet suction operation in the coal-based recovered material recovery device of this embodiment will be described. FIG. 9 is a diagram showing the difference in effect between the semi-dry suction operation and the wet suction operation according to the present embodiment. The numerical values ​​and quantities in FIG. 9 are for one suction work vehicle equipped with the coal-based recovered material recovery device of this embodiment. The numerical values ​​and quantities in FIG. 9 are those when the suction speed for suctioning the coal-based recovered material is approximately 80,000 (L / min). In the figure, the amount of water added (L / min) means the amount of water added (L / min) to the collected material 100 by the water adder 5. The suction time (min) means the time (min) for suctioning the collected material 100 by the suction unit 300. The total amount of water added (kg) means the integrated amount of water added (L / min) and the collection time (min). The total suction amount (kg) is the sum of the total amount of collected material 200 sucked up (kg) and the total amount of water added (kg). The net amount of collected material (kg) is the total suction amount (kg) minus the total amount of water added (kg). The moisture content (wt / %) of the collected material is the amount of moisture contained in the collected material 200 expressed in weight percent (wt%).

[0041] In FIG. 9, data was collected for the semi-dry suction operation with the water addition rates set to 5 (L / min), 15 (L / min), 25 (L / min), and 50 (L / min). When the water addition rate was 5 (L / min), 15 (L / min), 25 (L / min), and 50 (L / min), the net recovery amount of recovered material 200 was approximately 4900 (kg), approximately 4700 (kg), approximately 4500 (kg), and approximately 4000 (kg), and the moisture content of recovered material 200 was 2 (wt%), 6 (wt%), 10 (wt%), and 20 (wt%).

[0042] On the other hand, in FIG. 9, when the amount of water added was 140 (L / min) as the wet suction operation, the net amount of the collected material 200 was about 2200 (kg), and the moisture content of the collected material 200 was 56 (wt%).

[0043] In Figure 9, when comparing the semi-dry suction operation with water addition rates of 5 (L / min), 15 (L / min), 25 (L / min), and 50 (L / min) with the wet suction operation with water addition rate of 140 (L / min), the water addition rates were reduced to 1 / 28, 3 / 28, 5 / 28, and 5 / 14, and the net recovery amounts of recovered material 200 were increased to approximately (49 / 22), approximately (47 / 22), approximately (45 / 22), and approximately (40 / 22).

[0044] As described above, according to the semi-dry suction operation of this embodiment, the water adder adds water to the coal-based recovered material so that the moisture content of the coal-based recovered material stored in the receiver tank is more than 2 weight percent and not more than 20 weight percent. This makes it possible to suppress dust generation during discharge and provide a recovery device and a suction work vehicle with a high reuse rate of the coal-based recovered material. The reason why the moisture content of the coal-based recovered material is set to more than 2% by weight is that dust generation during discharge can be minimized.The reason why the moisture content of the coal-based recovered material is set to 20% by weight or less is based on the fact that the moisture content of low volatile bituminous coal suitable for coke production is 14% to 22% by weight (coal classification of the American Society for Testing and Materials (ASTMD-388)).

[0045] Furthermore, by adding water to the coal-based recovered material so that the moisture content of the coal-based recovered material stored in the receiver tank is between 6 and 10 weight percent, dust generation during discharge can be reliably suppressed, and the moisture content will be close to that of anthracite, which has a high calorific value, thereby further increasing the reuse rate of the coal-based recovered material.

[0046] The coal-based material recovered by the semi-dry operation this time has a calorific value of over 5,000 (kcal / kg) and can be used as a resource for fuel, materials, etc. In addition, the recovered coal-based material can be pressurized into pellets and used for purposes other than steelmaking.

[0047] As described above, according to the coal-based recovered material recovery device of the present embodiment, A receiver tank that receives the coal-based recovered material by sucking the coal-based recovered material through the suction unit using a suction device; A coal-based recovery material recovery device comprising: a filter connected to the receiver tank and configured to collect unrecovered coal-based recovery material that is not accommodated in the receiver tank; The suction section is provided with a water adder, and the water adder adds water to the coal-based recovered material so that the moisture content of the coal-based recovered material contained in the receiver tank is more than 2 weight percent and not more than 20 weight percent. This can suppress dust generation during discharge and improve the reuse rate of the coal-based recovered material stored in the receiver tank.

[0048] In addition, the water adder adds water to the coal-based recovered material so that the moisture content of the coal-based recovered material contained in the receiver tank is 6 weight percent or more and 10 weight percent or less. This reliably suppresses dust generation during discharge and improves the reuse rate of the coal-based recovered material stored in the receiver tank.

[0049] In addition, the water adding device is configured to add water to the coal-based recovered material so that the coal-based recovered material and moisture are uniformly mixed together. This reliably suppresses dust generation during discharge and improves the reuse rate of the coal-based recovered material stored in the receiver tank.

[0050] In addition, the water adder is either a jet type water adder that jets water from a plurality of jets provided on the inner circumferential surface of the suction part, or a spray type water adder that sprays water from a nozzle disposed in the center of the suction part. The opportunity for the coal-based recovered material to bind with moisture increases, improving the recovery rate of the coal-based recovered material.

[0051] In addition, the filter is a filter in which a resin coating layer having second holes smaller than the first holes is applied to the surface of a base material having first holes made of a resin sintered body. It has good releasability to collected powder, can prevent adhesion of coal-based recovered material with high moisture content, and can improve the recovery rate of coal-based recovered material.

[0052] In addition, a homogenizing and dispersing mechanism for the coal-based recovered material is disposed at a position inside the receiver tank where the coal-based recovered material sucked from the suction section collides, The coal-based waste material can be deposited in an evenly distributed manner at the bottom of the receiver tank.

[0053] Furthermore, since the homogenizing and dispersing mechanism is constructed using a chain, the coal-based recovered materials can be evenly dispersed and piled up at the bottom of the receiver tank with a simple structure.

[0054] In addition, the receiver tank is provided with a rupture disk that releases the gas in the receiver tank to the atmosphere when the gas pressure in the receiver tank exceeds a specified value. It is possible to prevent the gas pressure inside the receiver tank from increasing.

[0055] In addition, a brush-off device is provided on the outside of the receiver tank to apply an impact to the receiver tank to remove the coal-based recovered material adhering to the inner wall of the receiver tank. The coal-based recovered material adhering to the inner wall of the receiver tank can be dropped off, and the coal-based recovered material inside the receiver tank can be efficiently recovered.

[0056] The coal-based recovered material recovery device is configured to select either a case where water is added to the coal-based recovered material so that the moisture content of the coal-based recovered material is more than 2 weight percent and not more than 20 weight percent, or a case where water is added to the coal-based recovered material so that the moisture content of the coal-based recovered material is more than 20 weight percent, When water is added so that the moisture content of the coal-based recovered material is more than 2 weight percent and not more than 20 weight percent, the water adder is used and the unrecovered coal-based recovered material that is not accommodated inside the receiver tank is passed through the filter, and when water is added so that the moisture content of the coal-based recovered material is more than 20 weight percent, the water adder is not used and the unrecovered coal-based recovered material that is not accommodated inside the receiver tank is not passed through the filter. When water is added so that the moisture content of the coal-based recovered material is more than 2 weight percent and not more than 20 weight percent, dust generation during discharge can be suppressed and the reuse rate of the coal-based recovered material stored in the receiver tank can be improved.

[0057] In addition, by providing a suction work vehicle equipped with the coal-based recovered material recovery device, it is possible to provide a suction work vehicle that suppresses dust generation during discharge and improves the reuse rate of the coal-based recovered material stored in the receiver tank.

[0058] Although the present disclosure describes exemplary embodiments, the various features, aspects, and functions described in the embodiments are not limited to application to a particular embodiment, but may be applied to the embodiments alone or in various combinations. Therefore, countless variations not illustrated are expected within the scope of the technology of the present disclosure, including, for example, modifying, adding, or omitting at least one component.

[0059] Various aspects of the present disclosure are summarized below as appendices. (Appendix 1) A receiver tank that receives the coal-based recovered material by sucking the coal-based recovered material through the suction unit using a suction device; A coal-based recovery material recovery device comprising: a filter connected to the receiver tank and configured to collect unrecovered coal-based recovery material that is not accommodated in the receiver tank; A coal-based recovered material recovery device comprising a water adder in the suction section, the water adder adding water to the coal-based recovered material so that the moisture content of the coal-based recovered material stored in the receiver tank is more than 2 weight percent and not more than 20 weight percent. (Appendix 2) The water adder adds water to the coal-based recovered material so that the moisture content of the coal-based recovered material stored in the receiver tank is 6 weight percent or more and 10 weight percent or less. (Appendix 3) The coal-based recovery material recovery device according to claim 1 or 2, wherein the water adding device is configured to add water to the coal-based recovery material so that the coal-based recovery material and moisture are uniformly mixed. (Appendix 4) The coal-based recovered material recovery device according to Appendix 3, wherein the water adder is either a jet type water adder that sprays water from a plurality of nozzles provided on an inner circumferential surface of the suction part, or a spray type water adder that sprays water from a nozzle disposed in a central part of the suction part. (Appendix 5) The coal-based recovery material recovery device according to any one of appendices 1 to 4, wherein the filter is a filter in which a resin coating layer having second holes smaller than the first holes is applied to a surface of a base material having first holes made of a resin sintered body. (Appendix 6) The coal-based recovery material recovery device according to any one of claims 1 to 5, further comprising a homogenizing and dispersing mechanism for the coal-based recovery material, disposed at a position inside the receiver tank where the coal-based recovery material sucked from the suction section collides. (Appendix 7) The coal-based recovered material recovery device according to claim 6, wherein the homogenizing and dispersing mechanism is constituted by a chain. (Appendix 8) The coal-based recovery material recovery device according to any one of appendices 1 to 7, wherein the receiver tank is provided with a rupture disk that releases gas inside the receiver tank to the atmosphere when the gas pressure inside the receiver tank exceeds a specified value. (Appendix 9) The coal-based recovery material recovery device according to any one of appendices 1 to 8, further comprising a brush-off device provided outside the receiver tank, the brush-off device applying an impact to the receiver tank to remove the coal-based recovery material adhering to the inner wall of the receiver tank. (Appendix 10) The coal-based recovered material recovery device is configured to be able to select either a case where water is added to the coal-based recovered material so that the moisture content of the coal-based recovered material is more than 2 weight percent and not more than 20 weight percent, or a case where water is added to the coal-based recovered material so that the moisture content of the coal-based recovered material is more than 20 weight percent, The coal-based recovered material recovery device according to any one of Appendices 1 to 9, wherein, when water is added so that the moisture content of the coal-based recovered material is more than 2 weight percent and not more than 20 weight percent, the water adder is used and the unrecovered coal-based recovered material that is not accommodated inside the receiver tank is passed through the filter, and, when water is added so that the moisture content of the coal-based recovered material is more than 20 weight percent, the water adder is not used and the unrecovered coal-based recovered material that is not accommodated inside the receiver tank is not passed through the filter. (Appendix 11) A suction work vehicle equipped with a coal-based recovery material recovery device according to any one of appendix 1 to appendix 10. [Explanation of symbols]

[0060] 2 suction hoses, 4 suction devices, 5,5A,5B water heaters, 6 bursting discs, 7 Chain, 31 Receiver Tank, 32 Secondary Catcher, 33 3rd catcher, 34 4th catcher, 50 nozzle, 51 hollow cone nozzle, 71 first filter device, 72 second filter device, 90 filter, 91 resin coating layer, 92 base material, 100 coal-based recovered material, 200 Coal-based recovered material, 300 Suction section, 310 Suction port, 1000 Recovery device, 2000 suction work vehicle.

Claims

1. A receiver tank that receives the coal-based recovered material by sucking the coal-based recovered material through the suction unit using a suction device; A coal-based recovery material recovery device comprising: a filter connected to the receiver tank and configured to collect unrecovered coal-based recovery material that is not accommodated in the receiver tank; A coal-based recovered material recovery device comprising a water adder in the suction section, the water adder adding water to the coal-based recovered material so that the moisture content of the coal-based recovered material stored in the receiver tank is greater than 2 weight percent and less than 20 weight percent.

2. The coal-based recovered material recovery device according to claim 1 , wherein the water adder adds water to the coal-based recovered material so that the moisture content of the coal-based recovered material contained in the receiver tank is 6 weight percent or more and 10 weight percent or less.

3. 3. The coal-based material recovery device according to claim 1, wherein the water adder is configured to add water to the coal-based material so that the coal-based material and water are uniformly mixed together.

4. 4. The coal-based recovered material recovery device according to claim 3, wherein the water adder is either a jet type water adder that sprays water from a plurality of nozzles provided on an inner peripheral surface of the suction section, or a spray type water adder that sprays water from a nozzle disposed in a central portion of the suction section.

5. The coal-based recovery material recovery device according to claim 1 or claim 2, wherein the filter is a filter having a resin coating layer having second holes smaller than the first holes on the surface of a base material made of a resin sintered body.

6. The coal-based recovery material recovery device according to claim 1 or 2, further comprising a homogenizing and dispersing mechanism for the coal-based recovery material disposed at a position inside the receiver tank where the coal-based recovery material sucked from the suction section collides.

7. 7. The coal-based recovered material recovery device according to claim 6, wherein the homogenizing and dispersing mechanism is formed of a chain.

8. 3. The coal-based recovery material recovery device according to claim 1, wherein the receiver tank is provided with a rupture disk for releasing gas inside the receiver tank to the atmosphere when the gas pressure inside the receiver tank exceeds a specified value.

9. 3. The coal-based recovery material recovery device according to claim 1 or claim 2, further comprising a brush-off device provided outside the receiver tank for applying an impact to the receiver tank to cause the coal-based recovery material adhering to the inner wall of the receiver tank to fall off.

10. The coal-based recovered material recovery device is configured to be able to select either a case where water is added to the coal-based recovered material so that the moisture content of the coal-based recovered material is more than 2 weight percent and not more than 20 weight percent, or a case where water is added to the coal-based recovered material so that the moisture content of the coal-based recovered material is more than 20 weight percent, 3. The coal-based recovered material recovery device according to claim 1 or 2, wherein, when water is added so that the moisture content of the coal-based recovered material is more than 2 weight percent and not more than 20 weight percent, the water adder is used and the unrecovered coal-based recovered material that is not stored inside the receiver tank is passed through the filter, and when water is added so that the moisture content of the coal-based recovered material is more than 20 weight percent, the water adder is not used and the unrecovered coal-based recovered material that is not stored inside the receiver tank is not passed through the filter.

11. A suction work vehicle equipped with the coal-based recovered material recovery device according to claim 1 or 2.

Images