Dust collector, incineration facility, and melting facility

Abstract

To provide a dust collector, an incineration facility, and a melting facility capable of suppressing temperature drop of a hopper part.SOLUTION: A dust collector 30 for removing fly ash in exhaust gas by using a filter body 32 includes a hopper part 33 provided below the filter body 32 and capable of storing the fly ash captured by the filter body 32, and an opening at a height position of a lower end of the filter body 32 or below the height position of the lower end of the filter body 32. The exhaust gas introduction part 36 has a flow passage formed in a shape extending downward along the 34a of the upper sidewall of the funnel part 33 continuous with the exhaust gas introduction part 36 and spreading in a first direction orthogonal to the introduction direction of the exhaust gas.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to the technology of dust collectors, incineration facilities and melting facilities. [Background technology]

[0002] Conventionally, dust collector technology for removing solid content contained in exhaust gas has been known, as described in Patent Document 1, for example.

[0003] Patent Document 1 describes a bag filter device that uses filter cloth to remove dust contained in exhaust gas discharged from an incinerator. A hopper chamber is provided at the bottom of the bag filter device, into which exhaust gas from the incinerator is introduced and into which dust captured by the filter cloth is stored.

[0004] The hopper chamber is heated by the heat of the exhaust gas. If there are areas in the hopper chamber where the heat of the exhaust gas is not easily transmitted, these areas may cool and condensation may form inside the hopper chamber. If the acidic components contained in the exhaust gas dissolve in the water resulting from the condensation, the acidic liquid may corrode the hopper chamber. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 9-299732 Summary of the Invention [Problem to be solved by the invention]

[0006] One aspect of the present disclosure has been made in consideration of the above-described circumstances, and the problem it aims to solve is to provide a dust collector, an incinerator, and a melting furnace that can suppress a drop in temperature in the hopper section. [Means for solving the problem]

[0007] The problem to be solved by the present invention is as described above, and the means for solving this problem will now be described.

[0008] A dust collector according to one embodiment of the present disclosure is a dust collector that removes solids from exhaust gas using a filter body, and includes a hopper section that is located below the filter body and is capable of storing the solids captured by the filter body, and an exhaust gas inlet section that opens at the height position of the lower end of the filter body or below the height position of the lower end of the filter body and introduces the exhaust gas downward into the hopper section, and the exhaust gas inlet section has a flow path that is formed in a shape that widens as it goes downward along the width direction of the side wall of the hopper section that is continuous with the exhaust gas inlet section. According to one aspect of the present disclosure, a decrease in the temperature of the hopper section can be suppressed.

[0009] In one embodiment of the present disclosure, the flow path of the exhaust gas inlet section is formed in a shape that narrows in the thickness direction of the side wall of the hopper section that is continuous with the exhaust gas inlet section as it extends downward. According to one aspect of the present disclosure, exhaust gas can be effectively circulated through the side wall of the hopper section.

[0010] In one embodiment of the present disclosure, the upper side wall of the hopper section is formed in a shape that slopes downward toward the center of the hopper section when viewed in a plane, and the flow path of the exhaust gas inlet section is formed to be continuous with the upper side wall of the hopper section at the same degree of slope. According to one aspect of the present disclosure, exhaust gas can be effectively circulated through the side wall of the hopper section.

[0011] A dust collector according to one embodiment of the present disclosure includes a table feeder provided at the lower end of the hopper section to discharge the solid content from the hopper section, and the hopper section has side walls that define an internal space, the upper part of which is rectangular in plan view and the lower part of which is approximately octagonal in plan view. According to one aspect of the present disclosure, the heat retention of the hopper section can be improved.

[0012] In one embodiment of the present disclosure, the lower part of the hopper section is formed into an octagon in a plan view by arranging parts that form triangular faces and parts that form square faces alternately in the circumferential direction. According to one embodiment of the present disclosure, the hopper portion 33 having an octagonal lower portion in a plan view can be easily formed.

[0013] An incinerator according to one embodiment of the present disclosure comprises an incineration section for incinerating materials to be treated and a dust collector according to one embodiment of the present disclosure, and introduces the exhaust gas emitted as a result of incineration in the incineration section into the dust collector. According to one aspect of the present disclosure, exhaust gas from the incineration section can be used to suppress a decrease in temperature in the hopper section.

[0014] A melting furnace according to one embodiment of the present disclosure includes a melting section for melting the workpiece and a dust collector according to one embodiment of the present disclosure, and introduces the exhaust gas emitted as a result of melting in the melting section into the dust collector. According to one aspect of the present disclosure, exhaust gas from the melting section can be used to suppress a decrease in temperature of the hopper section. [Effects of the Invention]

[0015] According to one aspect of the present disclosure, a decrease in the temperature of the hopper section can be suppressed. [Brief explanation of the drawings]

[0016] [Figure 1] 1 is a block diagram showing an incineration facility equipped with a dust collector according to an embodiment of the present invention. [Figure 2] FIG. 2 is a perspective view schematically showing a dust collector. [Figure 3] FIG. 3 is a side cross-sectional view schematically showing the dust collector. [Figure 4] Cross-sectional view taken along line XX in Figure 3. [Figure 5] FIG. [Figure 6] FIG. [Figure 7]FIG. 1 is a block diagram showing a melting facility equipped with a dust collector. DETAILED DESCRIPTION OF THE INVENTION

[0017] In the following description, the directions indicated by arrows U, D, F, and B in the drawings are defined as the upward direction, downward direction, forward direction, and backward direction, respectively.

[0018] First, an example of an incineration facility 1 equipped with a dust collector 30 according to a first embodiment of the present invention will be described below.

[0019] The incineration facility 1 shown in Figure 1 incinerates materials to be treated and removes solid matter such as fly ash and gas components such as acids from the exhaust gas generated during incineration, releasing the gas into the atmosphere. Various combustible garbage (waste) can be used as the materials to be treated. The incineration facility 1 includes an incinerator 10, a heat exchanger 20, a dust collector 30, a table feeder 40, an exhaust gas treatment device 50, an induction device 60, and a chimney 70.

[0020] Figure 1 shows a schematic diagram of each piece of equipment in an incineration facility 1. As shown in Figure 1, an incinerator 10, a heat exchanger 20, a dust collector 30, an exhaust gas treatment device 50, an induction device 60, and a chimney 70 are connected to one another by a flue 2, which is a passage for exhaust gas. In the illustration, the flue 2 is indicated by a thick line.

[0021] The incinerator 10 incinerates materials to be treated. Materials to be treated are fed into the incinerator 10 by a feeder 11 such as a crane or conveyor. Air is also supplied to the incinerator 10 for burning the materials to be treated. The incinerator 10 is equipped with a main combustion chamber (not shown) for burning the materials to be treated, and a secondary combustion chamber (not shown) for completely burning unburned gas and other materials that are not completely burned in the main combustion chamber. For example, a stoker furnace equipped with a stepped fire grate can be used as the incinerator 10. Exhaust gas generated during combustion in the incinerator 10 flows through the flue 2 toward the heat exchanger 20.

[0022] The heat exchanger 20 recovers the exhaust heat of the high-temperature exhaust gas discharged from the incinerator 10 by performing heat exchange with the exhaust gas. The heat recovered by the heat exchanger 20 can be used, for example, as a power source for a generator turbine or to preheat the combustion air supplied to the incinerator 10. The temperature of the exhaust gas decreases as a result of the heat exchange in the heat exchanger 20. The exhaust gas passes through the flue 2 and flows toward the dust collector 30.

[0023] The dust collector 30 removes solid matter (fly ash) contained in the exhaust gas. The dust collector 30 will be described in detail later. The exhaust gas from which the fly ash has been removed by the dust collector 30 passes through the flue duct 2 and flows toward the exhaust gas treatment device 50.

[0024] The table feeder 40 discharges the fly ash removed by the dust collector 30. As shown in FIG. 3, the table feeder 40 is provided at the lower end of the dust collector 30 (a hopper section 33, which will be described later). As shown in FIG. 6, the table feeder 40 is formed in a generally circular shape in a plan view. The table feeder 40 has blades 41 that can rotate around a rotation axis whose axis is oriented in the vertical direction, and by rotating the blades 41, the fly ash can be discharged to the outside from a discharge port (not shown) provided on the bottom surface.

[0025] The exhaust gas treatment device 50 purifies harmful components such as nitrogen oxides contained in the exhaust gas discharged from the dust collector 30. The exhaust gas treatment device 50 performs appropriate treatment on the exhaust gas so that it can be released into the atmosphere. The exhaust gas purified by the exhaust gas treatment device 50 passes through the flue 2 and flows to the induction device 60 side.

[0026] The induction device 60 induces the exhaust gas in the flue 2 to the chimney 70. An appropriate fan can be used as the induction device 60. The exhaust gas induced by the induction device 60 is released into the atmosphere via the chimney 70.

[0027] An example of the incineration facility 1 has been described above. The incineration facility 1 is not limited to the above example, and various devices can be added. For example, a steam superheater can be provided downstream of the heat exchanger 20 in the flue 2 as needed. Also, a chemical supply device capable of supplying a chemical (such as activated carbon or hydrated lime) capable of removing acidic components (such as chlorine) from the exhaust gas can be installed upstream of the dust collector 30. Also, although the above example shows an example in which one dust collector 30 is provided in the incineration facility 1, multiple dust collectors 30 may also be provided.

[0028] Furthermore, a gas cooler (gas cooling tower) for cooling the exhaust gas discharged from the heat exchanger 20 may be installed, for example, upstream of the dust collector 30 in the flue 2. The gas cooler may be configured to cool the exhaust gas by spraying cooling water. Note that a component (e.g., caustic soda) capable of removing acidic gases in the exhaust gas may be added to the cooling water.

[0029] Next, the dust collector 30 according to this embodiment will be described in detail with reference to Figs. 2 to 6. The dust collector 30 removes fly ash from the exhaust gas by filtering the exhaust gas introduced therein. In this embodiment, a bag filter that filters the exhaust gas using a filter body 32, which will be described later, is used as the dust collector 30. The dust collector 30 includes a main body 31, a filter body 32, a hopper 33, an exhaust gas inlet 36, and an exhaust gas outlet 39.

[0030] The main body 31 shown in Figures 2 to 4 allows exhaust gas introduced therein to flow in the vertical direction. In this embodiment, the main body 31 is formed in a cylindrical shape that is generally rectangular (approximately oblong) in plan cross section. The main body 31 is formed in a generally rectangular parallelepiped shape with an outer casing that is long in the vertical direction. An opening 31a that opens downward is formed at the lower end of the main body 31. The main body 31 is formed so that exhaust gas introduced through the opening 31a can flow upward. A filter body 32, which will be described later, is housed inside the main body 31.

[0031] The filter body 32 shown in Figures 3 and 4 is capable of capturing fly ash in exhaust gas. The filter body 32 is housed in the internal space of the main body 31. The filter body 32 is formed in a generally cylindrical shape that is long in the vertical direction. The filter body 32 is supported by the main body 31 via an appropriate support member. A filter cloth used in a general bag filter can be used as the filter body 32. A plurality of filter bodies 32 are provided so as to occupy substantially the entire internal space of the main body 31 in a plan view (bottom view). Note that the example shown in Figure 3 shows some of the plurality of filter bodies 32.

[0032] An injector (not shown) that injects compressed air downward is provided above the filter body 32 in the internal space of the main body 31. The injector injects compressed air toward the filter body 32, causing the fly ash captured by the filter body 32 to fall downward.

[0033] The hopper section 33 shown in Figures 2 to 6 is configured to receive exhaust gas from an exhaust gas inlet section 36 (described later) and store fly ash captured by the filter body 32 in its internal space. The hopper section 33 is formed in a generally cylindrical shape that opens in the vertical direction. The hopper section 33 is connected to the lower end of the main body section 31. The hopper section 33 includes an upper section 34 and a lower section 35.

[0034] The upper portion 34 constitutes the upper portion of the hopper portion 33. As shown in Figures 5 and 6, the upper portion 34 is formed so that the internal space has a substantially quadrangular (substantially rectangular) shape in plan view. More specifically, the upper portion 34 is formed in a cylindrical shape of a substantially quadrangular truncated pyramid, with the cross-sectional area of ​​the internal space in plan view gradually decreasing downward.

[0035] The upper portion 34 has four upper walls 34a that divide the interior space on all four sides (front, back, left, and right). As shown in Fig. 5, each upper wall 34a is formed in a generally trapezoidal shape when viewed in the thickness direction. As shown in Figs. 3 to 5, each upper wall 34a is inclined downward so as to approach the center of the hopper portion 33 in a plan view (so as to approach each other). The inclination angle of the upper walls 34a with respect to the horizontal plane can be, for example, about 70°. An upper opening 34b that is generally rectangular in a plan view and opens upward is formed at the upper end of the upper portion 34.

[0036] The lower portion 35 constitutes the lower portion of the hopper portion 33. As shown in Figures 5 and 6, the lower portion 35 is formed so that the internal space is substantially octagonal in plan view. The lower portion 35 has a first lower wall 35a, a second lower wall 35b, and a flange portion 35c.

[0037] The first lower walls 35a divide the interior space of the lower portion 35 on all four sides (front, back, left, and right). Four first lower walls 35a are provided to correspond to the multiple upper walls 34a. Each first lower wall 35a is formed to extend downward from the lower end of each upper wall 34a. Each first lower wall 35a extends generally vertically. Each first lower wall 35a is formed to have a generally trapezoidal shape when viewed in the thickness direction. Therefore, a generally triangular gap is formed between adjacent first lower walls 35a (see FIG. 5).

[0038] The second lower walls 35b close the gaps between the adjacent first lower walls 35a. The second lower walls 35b are formed in a generally triangular shape corresponding to the gaps between the first lower walls 35a. Four second lower walls 35b are provided to correspond to the respective gaps. The second lower walls 35b are inclined downward so as to approach the center of the hopper section 33 in a plan view (so as to approach each other).

[0039] The flange portion 35c is a portion that extends radially from the lower end portions of the first lower wall 35a and the second lower wall 35b. As shown in Fig. 6, the outer peripheral edge of the flange portion 35c is formed in a generally circular shape in a plan view. As shown in Figs. 3 and 4, the flange portion 35c is fixed to the upper surface of the table feeder 40.

[0040] In the lower portion 35 according to this embodiment, substantially trapezoidal (quadrilateral) first lower walls 35a and substantially triangular second lower walls 35b are alternately arranged in the circumferential direction, forming an internal space that is substantially octagonal in plan view (see FIGS. 5 and 6). A lower opening 35d that is substantially octagonal in plan view and opens downward is formed at the lower end of the lower portion 35. Fly ash in the hopper portion 33 passes through the lower opening 35d and moves to the table feeder 40 (see FIG. 6).

[0041] The configuration of the hopper section 33 has been described above. Hereinafter, the side walls of the upper and lower sections 34 and 35 of the hopper section 33 (upper wall 34a, first lower wall 35a, and second lower wall 35b) may be simply referred to as "side walls." A heater (not shown) for raising the temperature of the hopper section 33 can be installed on the side walls of the hopper section 33. This can improve the heat retention of the dust collector 30.

[0042] The exhaust gas introduction section 36 shown in Figures 2 to 4 introduces exhaust gas discharged from the heat exchanger 20 or a gas cooling tower downstream of the heat exchanger 20 into the hopper section 33. The exhaust gas introduction section 36 is provided on the rear side B of the main body section 31. As shown in Figure 3, the exhaust gas introduction section 36 introduces gas downward into the hopper section 33. The exhaust gas introduction section 36 includes an introduction pipe section 37 and a flow path forming section 38.

[0043] The introduction pipe section 37 is a section into which exhaust gas is introduced from the heat exchanger 20. The introduction pipe section 37 is formed in a substantially cylindrical shape extending in the vertical direction. The introduction pipe section 37 is connected to the flue 2 on the heat exchanger 20 side (see FIG. 3).

[0044] The flow path forming section 38 forms a flow path for introducing the exhaust gas introduced from the inlet pipe section 37 into the hopper section 33. The flow path forming section 38 is connected to the lower end of the inlet pipe section 37. The flow path forming section 38 has an internal space that serves as a flow path for the exhaust gas and is formed in a generally cylindrical shape that is generally rectangular in plan view. The internal space of the flow path forming section 38 is partitioned by a first side wall 38a, a second side wall 38b, and a third side wall 38c.

[0045] 3 defines a front side F of the internal space of the flow path forming portion 38. The first side wall 38a is formed to extend generally vertically. The first side wall 38a is disposed to separate the internal space of the flow path forming portion 38 from the internal space of the main body portion 31.

[0046] The second side wall 38b shown in FIGS. 2 and 3 defines a rear side B of the internal space of the flow path forming section 38. The second side wall 38b is inclined downward toward (close to) the first side wall 38a. The inclination angle of the second side wall 38b with respect to the horizontal plane can be approximately the same as the inclination angle of the upper wall 34a of the hopper section 33 with respect to the horizontal plane. Specifically, the inclination angle of the second side wall 38b can be the same as the inclination angle of the upper wall 34a of the hopper section 33 or a value close to the inclination angle of the upper wall 34a (for example, a value of ±10°). In this embodiment, the inclination angle of the second side wall 38b with respect to the horizontal plane is approximately 70°.

[0047] 2 and 4 divide the internal space of the flow path forming section 38 into left and right sides. The pair of left and right third side walls 38c are inclined downward so as to move away from each other. The width dimension (left-right dimension) of the lower end portions of the pair of left and right third side walls 38c is generally the same as the width dimension of the hopper section 33 (upper portion 34).

[0048] As shown in Fig. 4, the internal space (flow path) of the flow path forming section 38 defined by the side walls is formed in a shape that widens in the width direction (approximately the left-right direction LR) of the side wall (rear upper wall 34a) of the hopper section 33 that is continuous with the flow path as it extends downward. Also, as shown in Fig. 3, the flow path of the flow path forming section 38 is formed in a shape that narrows in the thickness direction (approximately the front-back direction FB) of the side wall (rear upper wall 34a) of the hopper section 33 as it extends downward.

[0049] An opening 38d that is generally rectangular in plan view and opens downward is formed at the lower end of the flow path forming portion 38. As shown in Fig. 3, the opening 38d of the exhaust gas inlet portion 36 (flow path forming portion 38) and the opening 31a of the main body portion 31 are connected to the upper opening 34b of the hopper portion 33 (upper portion 34). In addition, the opening 38d of the exhaust gas inlet portion 36 (flow path forming portion 38) is located lower than the height position of the lower end of the filter body 32.

[0050] As shown in FIG. 3, the flow path forming portion 38 is formed so that the second side wall 38b is continuous with the rear upper side wall 34a of the hopper portion 33 at approximately the same inclination (at a similar inclination angle).

[0051] 2 and 4 discharges the flue gas from which fly ash has been removed by the filter body 32. As shown in Fig. 4, the flue gas discharge part 39 is provided in the upper part of the main body 31 so as to be located higher than the height of the upper end of the filter body 32. The flue gas discharge part 39 is connected to the flue 2 of the flue gas treatment device 50.

[0052] The above has described the details of the dust collector 30. Hereinafter, the flow of exhaust gas through the dust collector 30 according to this embodiment will be described.

[0053] 3 and 4, the exhaust gas introduced into the exhaust gas inlet 36 flows along the flow path of the flow path forming portion 38, which is formed so as to widen in the left-right (LR) direction as it flows downward and narrow in the front-rear (FB) direction. The flow velocity of the exhaust gas decreases as it flows through the flow path.

[0054] The exhaust gas that has flowed through the flow passages of the flow passage forming section 38 is introduced into the hopper section 33 so as to spread in the left-right direction (LR) (see FIG. 4). As shown in FIG. 3, the exhaust gas is introduced downward into the hopper section 33 from below the height position of the lower end of the filter body 32. The exhaust gas flows downward along the side walls of the hopper section 33, turns around at the bottom, and flows upward along the side walls.

[0055] According to this embodiment, the exhaust gas can be circulated along almost the entire side walls of the hopper section 33. This allows the heat of the exhaust gas to be used to raise the temperature of almost the entire hopper section 33. This configuration makes it possible to suppress corrosion caused by condensation that accompanies a drop in the temperature of the hopper section 33. Furthermore, if a heater is installed to suppress a drop in the temperature of the hopper section 33, the power consumption thereof can be reduced.

[0056] As described above, the flue gas that has flowed through the hopper section 33 is introduced into the internal space of the main body section 31 at a reduced flow rate. The flue gas introduced into the main body section 31 flows upward through the internal space while passing through the filter body 32. At this time, the flow rate of the flue gas further decreases, and the pressure loss caused by the filter body 32 allows the flue gas to flow generally uniformly through the internal space. In this embodiment, the internal space of the main body section 31 is formed into a substantially rectangular shape in a plan view, which makes it easy to homogenize the flow of flue gas. As the flue gas passes through the filter body 32, fly ash in the flue gas is captured by the filter body 32.

[0057] As shown in Fig. 4, the flue gas that has passed through the filter 32 passes through the flue gas discharge section 39 and is discharged to the flue gas treatment device 50 side. The fly ash captured by the filter 32 falls downward when compressed air is injected by the injection device in the main body 31. The fallen fly ash is collected in the hopper section 33 and discharged to the table feeder 40 side.

[0058] In this embodiment, by rotating the blades 41 of the table feeder 40, fly ash from the hopper section 33 (internal space of the lower part 35) can be discharged downward through a discharge port (not shown). Here, in this embodiment, the internal space of the lower part 35 of the hopper section 33 is formed in a generally octagonal shape in a plan view, which improves the workability of manufacturing and also makes it possible to suppress a decrease in the temperature of the hopper section 33.

[0059] That is, from the viewpoint of optimally discharging the fly ash from the hopper section 33 using the table feeder 40, it is desirable that the shape of the internal space of the lower part 35 of the hopper section 33 be close to a circle, which corresponds to the rotational trajectory of the blades 41 of the table feeder 40. To make the shape of the internal space of the lower part 35 of the hopper section 33 closer to a circle, it is generally expected that each side wall of the hopper section, which is a rectangular cylindrical shape in a plan view, will be bulged so that it has an arc shape. However, machining each side wall to have an arc shape can be a heavy workload. Furthermore, if the shape of the lower part 35 is made closer to a circle, the surface area of ​​the bottom of the hopper section will increase, which will facilitate heat escape, and it is expected that the heat retention of the hopper section 33 will be reduced.

[0060] On the other hand, according to this embodiment, by alternately arranging the substantially trapezoidal first lower wall 35a and the substantially triangular second lower wall 35b in the circumferential direction, it is possible to easily form the hopper section 33 having an internal space with a shape close to a circle (a substantially octagonal shape), thereby improving the workability of manufacturing the hopper section 33. Furthermore, according to the above configuration, unlike when the lower portion 35 of the hopper section 33 is formed to be substantially circular in plan view, it is possible to prevent the surface area of ​​the bottom of the hopper section 33 from increasing. This improves the heat retention of the hopper section 33.

[0061] The dust collector 30 and incineration facility 1 according to this embodiment have been described above. In the above embodiment, an example has been shown in which the dust collector 30 is provided in the exhaust gas treatment path of the incinerator 10, but the present invention is not limited to this configuration. For example, as shown in FIG. 7, the dust collector 30 can also be provided in the exhaust gas treatment path of the melting furnace 10A of the melting facility 1A. An example of a melting facility 1A equipped with the dust collector 30 will be described below.

[0062] The melting facility 1A shown in Figure 7 melts the materials to be treated and removes ash and other waste from the exhaust gases generated during the melting process, releasing it into the atmosphere. Incineration ash generated at an incineration facility can be used as the material to be treated. The melting facility 1A includes a melting furnace 10A, a heat exchanger 20, a dust collector 30, a table feeder 40, an exhaust gas treatment device 50, an induction device 60, and a chimney 70.

[0063] The melting facility 1A, with the exception of the melting furnace 10A, is generally configured in the same manner as the incineration facility 1. Therefore, in the following explanation of the melting facility 1A, differences from the incineration facility 1 will be explained, and explanations of the common components (heat exchanger 20, dust collector 30, table feeder 40, exhaust gas treatment device 50, induction device 60, and chimney 70) will be omitted as appropriate.

[0064] The melting furnace 10A melts the material (incineration ash) using the heat generated by burning fuel to produce slag (molten slag). The material is fed into the melting furnace 10A by an appropriate feeder 11. The melting furnace 10A is equipped with a main chamber (not shown) for melting the material, and a secondary combustion chamber (not shown) for completely combusting unburned gas and other materials generated in the main chamber. The slag produced in the melting furnace 10A is discharged by an appropriate discharge device (not shown). Furthermore, exhaust gas generated during melting in the melting furnace 10A flows through the flue 2 toward the heat exchanger 20.

[0065] The dust collector 30 can remove fly ash contained in the exhaust gas discharged from the melting furnace 10A. Even when installed in the melting facility 1A, the dust collector 30 according to this embodiment can prevent a decrease in the temperature of the hopper section 33 by favorably circulating the exhaust gas within the hopper section 33, just as when installed in the incineration facility 1. In addition, the dust collector 30 can prevent the salts in the exhaust gas from liquefying and solidifying within the hopper section 33.

[0066] An example of the melting facility 1A has been described above. However, the melting facility 1A is not limited to the above example, and various devices can be added. For example, similar to the incineration facility 1 described above, it is possible to provide a steam superheater downstream of the heat exchanger 20 in the flue 2, or a chemical supply device or a gas cooler upstream of the dust collector 30. Furthermore, although the above example shows the melting facility 1A equipped with one dust collector 30, it is also possible to provide multiple dust collectors 30. It is also possible to combine the melting facility 1A with the incineration facility 1. In this way, the incineration ash generated at the incineration facility 1 can be melted at the melting facility 1A.

[0067] As described above, the dust collector 30 according to this embodiment has the following features: A dust collector 30 that removes fly ash (solid content) from exhaust gas using a filter 32, a hopper portion 33 provided below the filter body 32 and capable of storing the fly ash captured by the filter body 32; an exhaust gas inlet 36 that opens at a height position of the lower end of the filter body 32 or below the height position of the lower end of the filter body 32 and introduces the exhaust gas downward toward the hopper portion 33; Equipped with The exhaust gas introduction section 36 is As it goes downward, it has a flow path that is formed in a shape that widens along the width direction (left and right LR direction) of the side wall (upper wall 34a of the rear side B) of the hopper section 33 that is continuous with the exhaust gas inlet section 36.

[0068] This configuration can suppress a drop in temperature of the hopper section 33. That is, by circulating the exhaust gas along the side wall of the hopper section 33, the heat of the exhaust gas can be used to raise the temperature of the hopper section 33. This configuration can suppress corrosion caused by condensation that accompanies a drop in temperature of the hopper section 33, and if a heater is installed to suppress a drop in temperature of the hopper section 33, the power consumption thereof can be reduced.

[0069] The flow path of the exhaust gas introduction part 36 is As it goes downward, it is formed in a shape that narrows along the thickness direction (front-to-back FB direction) of the side wall (upper wall 34a of the rear side B) of the hopper section 33 that is continuous with the exhaust gas inlet section 36.

[0070] With this configuration, the exhaust gas can be effectively circulated through the side wall of the hopper portion 33.

[0071] The upper wall 34a of the upper portion 34 of the hopper portion 33 is The hopper portion 33 is formed in a shape that is inclined downward so as to be directed toward the center of the hopper portion 33 in a plan view. The flow path (second side wall 38b) of the exhaust gas introduction part 36 is The upper wall 34a of the upper portion 34 of the hopper portion 33 is formed so as to be continuous with the upper wall 34a at the same inclination.

[0072] With this configuration, the exhaust gas can be effectively circulated through the side wall of the hopper portion 33.

[0073] In addition, the dust collector 30 is A table feeder 40 is provided at the lower end of the hopper section 33 and discharges the fly ash from the hopper section 33. The hopper section 33 is Of the side walls that define the internal space, an upper portion 34 is rectangular in plan view, and a lower portion 35 is generally octagonal in plan view.

[0074] This configuration improves the heat retention of the hopper section 33. In other words, compared to when the side walls of the hopper section, which is rectangular in plan view, are bulged out into an arc shape to accommodate the table feeder 40, which is generally circular in plan view, the surface area of ​​the hopper section 33 is prevented from increasing. This improves the heat retention of the hopper section 33.

[0075] In addition, the lower portion 35 of the hopper portion 33 is The second lower wall 35b (the part that forms the triangular surface) and the first lower wall 35a (the part that forms the square surface) are arranged alternately in the circumferential direction, thereby forming an octagon in a planar view.

[0076] By configuring in this way, it is possible to easily form the hopper portion 33 whose lower portion 35 is octagonal in plan view.

[0077] In addition, the incineration facility 1 according to this embodiment is an incinerator 10 (incinerator unit) for incinerating materials to be treated; A dust collector 30 according to any one of claims 1 to 5; Equipped with The exhaust gas discharged as a result of incineration in the incinerator 10 is introduced into the dust collector 30.

[0078] By configuring in this way, exhaust gas from the incinerator 10 can be used to suppress a drop in the temperature of the hopper section.

[0079] In addition, the melting facility 1A according to this embodiment is a melting furnace 10A (melting section) for melting the workpiece; A dust collector 30 according to any one of claims 1 to 5; Equipped with The exhaust gas discharged as a result of melting in the melting furnace 10A is introduced into the dust collector 30.

[0080] With this configuration, the exhaust gas from the melting furnace 10A can be used to suppress a drop in the temperature of the hopper section.

[0081] The first lower wall 35a according to this embodiment is one embodiment of a portion constituting a quadrangular surface according to the present invention. The second lower wall 35b according to this embodiment is one embodiment of a portion constituting a triangular surface according to the present invention. The incinerator 10 according to this embodiment is one embodiment of the incineration section according to the present invention. The melting furnace 10A according to this embodiment is one embodiment of the melting part according to the present invention.

[0082] Although the embodiments of the present invention have been described above, the present invention is not limited to the above configurations and various modifications are possible within the scope of the invention as defined in the claims. Furthermore, the specific numerical values ​​exemplified in the above description are merely examples and can be modified as desired.

[0083] For example, in the above embodiment, the exhaust gas introduction section 36 is configured to introduce exhaust gas downward toward the hopper section 33 from a position lower than the height position of the lower end of the filter body 32, but this is not limited to the above example. For example, the exhaust gas introduction section 36 may be configured to introduce exhaust gas downward toward the hopper section 33 from a position roughly the same height position as the lower end of the filter body 32.

[0084] In the above embodiment, the flow path of the exhaust gas introduction part 36 is formed in a shape that narrows in the front-rear FB direction as it goes downward, but this is not limited to the above example. For example, the width of the flow path of the exhaust gas introduction part 36 in the front-rear FB direction may be formed to be approximately the same throughout, or the flow path of the exhaust gas introduction part 36 may be formed in a shape that widens in the front-rear FB direction as it goes downward.

[0085] Furthermore, in the hopper section 33 according to the above embodiment, the lower section 35 is shown as being formed in an octagonal shape made up of straight lines as an example of the lower section 35 having a generally octagonal shape in plan view, but is not limited to the above example. For example, the lower section 35 may be formed in an octagonal shape with rounded corners in plan view (an octagonal shape with rounded corners). Furthermore, the shape of the lower section 35 of the hopper section 33 is not limited to being generally octagonal in plan view, and various shapes can be employed. For example, the lower section 35 may be formed in a generally circular shape in plan view. [Explanation of symbols]

[0086] 1. Incineration facility 10 Incinerator 20 Heat exchanger 30 Dust collector

Claims

1. A dust collector that removes solids from exhaust gas using a filter, a hopper portion provided below the filter body and capable of storing the solid content captured by the filter body; an exhaust gas inlet portion that opens at a height position of the lower end of the filter body or below the height position of the lower end of the filter body and introduces the exhaust gas downward into the hopper portion; Equipped with The exhaust gas introduction part a flow path formed in a shape that widens downward along the width direction of the side wall of the hopper portion that is continuous with the exhaust gas inlet portion; Dust collector.

2. The flow path of the exhaust gas introduction part is The exhaust gas inlet is formed in a shape that narrows downward along the thickness direction of the side wall of the hopper portion that is continuous with the exhaust gas inlet portion. The dust collector of claim 1 .

3. The side wall of the upper part of the hopper section is The hopper portion is formed in a shape that is inclined downward so as to be directed toward the center of the hopper portion in a plan view, The flow path of the exhaust gas introduction part is The hopper section is formed so as to be inclined to the same degree and continuous with the upper side wall of the hopper section. The dust collector of claim 1 .

4. a table feeder provided at a lower end of the hopper section and configured to discharge the solid content from the hopper section; The hopper section includes: Of the side walls that divide the internal space, the upper part is rectangular in plan view and the lower part is approximately octagonal in plan view. The dust collector of claim 1 .

5. The lower part of the hopper section is The triangular surface portions and the quadrangular surface portions are alternately arranged in the circumferential direction to form an octagonal shape in a plan view. The dust collector of claim 4.

6. an incineration unit that incinerates the object to be treated; A dust collector according to any one of claims 1 to 5; Equipped with The exhaust gas discharged during incineration in the incineration section is introduced into the dust collector. Incineration facility.

7. a melting portion that melts the workpiece; A dust collector according to any one of claims 1 to 5; Equipped with The exhaust gas discharged in association with the melting in the melting portion is introduced into the dust collector. Melting facility.

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