JP6398942B2 - Inertia dust collector and boiler equipment - Google Patents

Description

  The present invention relates to an inertial dust collector and a boiler facility. In particular, the present invention relates to a dust collector that is arranged in front of a boiler and collects dust in advance.

As a collision-type inertial force dust collector, there is a dust collector described in Patent Document 1, for example.
The dust collector of Patent Document 1 is a device that collects dust of about 1 to 50 μm in exhaust gas discharged from a boiler, and the upper part of the dust collection container whose lower part is a hopper shape (than the hopper shape part) The upper side) is formed so that the inlet and the outlet face each other in the lateral direction, and a plurality of the dust collection containers are arranged between the inlet and the outlet, that is, in the gas inflow direction from the inlet. It arrange | positions so that the collision plate of a sheet | seat may interpose. And it collides with a collision board, dust is collected, and dust accumulates in the lower part of a hopper-shaped dust collecting container.
Here, in Patent Document 1, the collection efficiency by the collision plate is such that the shorter the distance between the collision plates arranged in the gas inflow direction, or the faster the gas flow rate passing between the collision plates arranged on the left and right, the higher the collection efficiency. It is described as being efficient (see page 3).

Moreover, as a collision type inertial force dust collector for a high-temperature inert gas disposed in front of a boiler, for example, there is a dust collector described in Patent Document 2.
Also in this dust collector, the inlet and outlet are formed in the upper part of the dust container (above the hopper-shaped part) so as to face each other in the lateral direction, and a collision plate is disposed in the dust container. ing. The collision plate extends downward from the ceiling of the gas path, and the tip is positioned in the hopper-shaped space, that is, positioned below the horizontal gas flow path. As a result, a gas flow path that passes through the hopper-shaped space and rises around the lower end of the collision plate is formed, and dust is separated from the gas at the position where the downward flow changes to the upward flow behind the collision plate. It is described that it is deposited in the hopper. However, in this collision plate, the removal of dust with a relatively large particle size is insufficient, and the ceiling of the rear horizontal part (duct) communicating with the boiler from the dust container outlet is easily damaged by the duct in the gas. In Patent Document 2, a partition is set at the bottom of the rear horizontal portion communicating with the boiler from the dust container outlet.

  Note that Patent Document 3 describes an example of a dust collector in which an outlet formed in the upper portion of the dust collecting container is disposed above the inlet. The collision plate disposed in the dust container is set so that the lower end thereof is positioned in the hopper-shaped portion and the exhaust gas reliably collides with the collision plate.

Japanese Patent Laid-Open No. 56-21621 JP 2013-163751 A Japanese Patent Publication No. 3-50924

Increasing the size of the dust collector can increase the dust collection efficiency for all dust from coarse particle size dust to coarse particle size dust. However, increasing the size of the dust collection device leads to an increase in cost. Moreover, the case where a dust collector cannot be enlarged depending on a setting position is also assumed.
Further, as the dust having a large particle size (coarse particle size dust) increases, the burden of dust on the device to which the gas that has passed through the dust collector is supplied increases.
The present invention pays attention to the above points, and an object of the present invention is to provide an inertial dust collecting apparatus capable of efficiently removing dust having a relatively large particle size without incurring costs.

  In order to solve the problem, an inertial force dust collector according to one aspect of the present invention includes a hopper-shaped dust accumulation portion in which an area of an internal space decreases as it goes downward, and a space above the space in the dust accumulation portion. Inertial force collection that has a dust collecting container including a gas introduction part that surrounds the side, takes dust-containing gas from an inlet formed in the side wall of the gas introduction part, and sends the collected gas from the outlet to a subsequent boiler A dust device, wherein an inflow direction of a gas flowing into the dust collecting container from the inlet is set so as to face a wall portion of a gas introduction portion facing the inlet in a lateral direction, and the gas facing the inlet in a lateral direction When the wall portion of the introduction portion is referred to as a facing wall position, the outlet is disposed above the facing wall position, and no collision plate is interposed between the facing inlet and the facing wall position. It is characterized by.

  In addition, the inertial force dust collector according to another aspect of the present invention surrounds a hopper-shaped dust accumulation portion in which the area of the internal space decreases as it goes downward, and the side of the space above the space in the dust accumulation portion. An inertial dust collector that has a dust collection container having a gas introduction part, takes dust-containing gas from an inlet formed on the side wall of the gas introduction part, and sends the collected gas from the outlet to a subsequent boiler. The inflow direction of the gas flowing into the dust collecting container from the inlet is set to face the wall portion of the gas introduction portion facing the inlet in the lateral direction, and the wall of the gas introduction portion facing the inlet in the lateral direction When the portion is referred to as a facing wall position, the outlet is disposed above the facing wall position, and one or more collision plates extending vertically between the facing inlet and the facing wall position Under the collision plate The height position is equal to or higher than the one-third position above the lower end of the inlet when the vertical distance between the lower end and the upper end of the inlet is divided into three equal parts. It is set to a height position.

In the present invention, unlike the conventional dust collector, the collision plate is omitted, or even if the collision plate is arranged, the lower end position of the collision plate is arranged at a higher position than the conventional one, and the collision with the inlet is performed. A portion that does not overlap the plate in the vertical direction is formed. This suppresses an increase in the gas flow rate due to the narrowing of the gas flow path in the dust collecting container due to the arrangement of the collision plate.
As a result, it is possible to prevent the coarse particle dust from being rolled up and flowing into the subsequent stage due to the high gas flow rate. In addition, it is possible to reduce the load caused by dust on a subsequent apparatus such as a boiler, and it is possible to reduce repair processing of the subsequent apparatus.

It is a conceptual diagram explaining the sintering equipment which concerns on embodiment based on this invention. It is a key map explaining boiler equipment concerning an embodiment based on the present invention. It is an analysis result in the dust collector of a reference example, Comprising: (a) is a gas flow velocity distribution, (b) is a figure which shows the result of a dust particle analysis. It is an analysis result in the dust collector which concerns on embodiment based on this invention, Comprising: (a) is a gas flow velocity distribution, (b) is a figure which shows the result of a dust particle analysis. It is a figure which shows another example of arrangement | positioning of the collision board which concerns on embodiment based on this invention.

Next, embodiments of the present invention will be described with reference to the drawings.
In the present embodiment, a case where the present invention is applied to a boiler facility provided in a sintering facility will be described as an example.
<Sintering equipment>
In the sintering facility, as shown in FIG. 1, various raw materials sent from the yard are blended, mixed and granulated, and charged into the sintering machine 1. The sintered ore that has completed the sintering reaction on the sintering machine 1 is discharged at the discharge section, supplied to the cooler 3 through the crusher 2, cooled by the cooler 3, and further sized by the screen 5, Sent to the blast furnace.
Further, adjacent to the cooler 3, a boiler facility 4 using exhaust heat when cooling the sintered ore is installed. The boiler equipment 4 collects exhaust heat from the supply section where the sensible heat of the sintered ore is the largest in the cooler 3, and recovers the heat to the cooler 3 after recovering the heat with the boiler.

<Boiler equipment>
As shown in FIG. 2, the boiler facility 4 includes a boiler 11, a dust collector 10 disposed at the front stage of the boiler 11, and a blower 12 disposed at the rear stage of the dust collector.
The blower 12 is a device that sucks the exhaust gas from the boiler 11 from the suction port and pumps the sucked exhaust gas to the cooler 3.
In the boiler 11, a superheater, an evaporator, and a economizer pipe are arranged in this order from the upper side to the lower side in the boiler case 11 a, and the lower end portion of the boiler case 11 a has a hopper structure and falls from the upper side. The accumulated dust can be deposited on the lower end of the hopper structure. A damper for discharging dust is formed at the lower end of the hopper structure.
The boiler housing 11a has an exhaust gas inlet at the top, and a plurality of rectifying plates for dispersing and rectifying the exhaust gas flowing from the exhaust gas inlet is disposed above the superheater. A gas discharge port is formed below the economizer of the boiler housing 11a and above the hopper structure, and the gas discharge port is connected to the suction port of the blower 12 through a duct.

<Configuration of dust collector 10>
The dust collector 10 of this embodiment is an inertia force dust collector. The dust collector 10 includes a dust collection container 100 having an inlet 100a and an outlet 100b for introducing and discharging exhaust gas.
The dust collecting container 100 includes a hopper-shaped dust accumulation portion 100c and a gas introduction portion 100e surrounding a space S2 above the space S1 defined by the dust accumulation portion 100c. And the space S for dust collection in the dust container 100 is prescribed | regulated by the space S1 and the space S2.
The side wall of the gas introduction part 100e has an inlet 100a for introducing exhaust gas and an outlet 100b for discharging exhaust gas, and the exhaust gas introduction port of the boiler housing 11a is connected to the outlet 100b.

An exhaust gas duct 120 is connected to the inlet 100a, and dust-containing exhaust gas from the cooler 3 is guided to the exhaust gas duct and sent into the dust collecting container 100 from the inlet 100a. The exhaust gas duct 120 is L-shaped and communicates with a duct portion that extends downward from above and a lower end portion of the duct portion to guide the exhaust gas in the lateral direction and connect to the inlet 100a. That is, the direction of the downstream opening end of the exhaust gas duct 120, that is, the inflow direction of the exhaust gas introduced from the inlet 100a is supplied so that the inside of the dust collecting container 100 is directed horizontally or substantially horizontally from the inlet 100a. The dust collecting container 100 has, for example, a rectangular shape in a top view.
Here, in the sintering facility, the flow rate of the exhaust gas flowing through the exhaust gas duct 120 is in the range of 10.0 to 20.0 m / s, and in the present invention, the exhaust gas has a flow rate of 10.0 m / s or more. An advantageous effect is obtained when passing through the entrance 100a.

The position of the outlet 100b is set above the position of the side wall portion formed by the gas introduction part 100e that faces the inlet 100a in the gas inflow direction (hereinafter referred to as the opposing wall position 100d).
The first collision plate 110 is disposed on the front side of the facing wall position 100d. The first collision plate 110 is arranged to extend downward from above. The first collision plate 110 is disposed at a position closer to the outlet 100b side than the inlet 100a, and the height of the lower end position of the first collision plate 110 is the vertical center position of the inlet 100a or above it. Set to position. Although FIG. 2 illustrates the case where the height of the lower end of the first collision plate 110 is higher than the vertical center position of the inlet 100a, the lower end of the first collision plate 110 is the height in the vertical direction of the inlet 100a. When the height is divided into three equal parts, the height may be equal to or higher than the height position one third above the lower end position of the inlet 100a.

In addition, the upper end portion of the first collision plate 110 may be in contact with the ceiling portion of the gas introduction portion 100e, but in the example of FIG. 2, the gas flow is not brought into contact with the ceiling portion of the gas introduction portion 100e. A rectifying plate that disperses the water.
The first collision plate 110 may be removed, or the first collision plate 110 may be disposed closer to the inlet 100a with respect to the outlet 100b position, but is preferably closer to the outlet 100b.

<Operation of the dust collector of the reference example>
Here, the dust collector of the reference example will be described. As shown in FIG. 3B, the dust collector of the reference example is closer to the inlet 100 a than the first collision plate 110 and downward from the ceiling surface of the gas introduction unit 100 e with respect to the dust collector 10 having the above configuration. It is the dust collector 10 which has arrange | positioned the 2nd collision board 200 extended. The height of the lower end of the second collision plate 200 was set to the same height as the entrance 100a. In the configuration of the boiler facility having the dust collector of this reference example, the flow velocity distribution of gas and the locus of dust particles were obtained by flow analysis. The result is shown in FIG. FIG. 3A is a diagram showing the gas flow velocity distribution, and the lighter the color, the faster the flow velocity. FIG. 3B is a diagram showing the locus of dust particles.

Here, the inventors operated the boiler equipment 4 using the dust collector of this reference example, and as a result, the steam generation amount (steam generation capability (efficiency) and operation rate) of the boiler 11 over time. It was confirmed that it declined.
At this time, the factor of lowering the steam generation capability was a broken hole in the boiler 11 tube. Furthermore, as a means of preventing the blower 12 from being worn (described later), it was also a factor that the heat input was lowered by reducing the amount of air flow through the boiler 11.
Moreover, the factor of the operating rate reduction was an increase in the vibration value of the blower 12 arranged at the rear stage of the boiler 11. This is because when the vibration value of the blower 12 becomes equal to or higher than the management value, it is necessary to stop the boiler 11 and perform a balance correction process for the blower 12. Moreover, the above-mentioned broken hole of a tube is also a factor of a working rate fall.

Thus, it is presumed that the wear of the tube due to the dust in the exhaust gas is a cause of deterioration of the superheater / evaporator and the like of the boiler 11. In addition, the cause of deterioration of economizers is presumed to be aeration differential corrosion due to exhaust gas temperature and feed water temperature. In particular, the burden caused by the coarse particle dust is very large.
Moreover, when inventors examined the vibration value raise of the air blower 12, the knowledge that the imbalance of the rotary body by the wear thinning of the main board and blade board of the air blower 12 was acquired was acquired. That is, due to dust attack in the exhaust gas, the wear-resistant material (hardened cladding / ceramic) disappears, the balance is lost, and the vibration value increases. Even if the balance is corrected and started up, the balance is lost again in a short period of time, and the vibration value increases. We obtained the knowledge that this is a factor of lowering the operating rate.

As described above, it is understood that the dust concentration in the exhaust gas moving to the boiler 11 side needs to be lowered as a countermeasure against the wear of the superheater / evaporator tube of the boiler 11 and the wear of the blower 12.
Here, the dust collector 10 is originally provided because dust is removed by the dust collector 10 in the front stage so that the constituent parts of the boiler 11 and the blower 12 in the rear stage are not worn. When the second collision plate 200 is provided, the wear of the boiler tube and the blower 12 is remarkable, and it has been confirmed that the amount of dust discharged from the lower damper of the dust collector 10 is small. It has been found that there is a high possibility that the dust collector 10 is not effectively dedusting.

As shown in FIG. 3, which is the analysis result, the gas flow path is narrowed by the installation of the second collision plate 200, and the exhaust gas flow velocity that goes around the lower end of the second collision plate 200 and rises toward the outlet 100b is increased. I understand. And it is thought that the coarse particle dust is also rolled up and flows into the boiler 11 side of the back | latter stage because the flow velocity of the upward flow increased.
Here, the flow velocity of the gas in the exhaust gas duct 120 was 15.9 m / s, whereas the flow velocity of the upward flow of gas was increased to 50 to 80 m / s.
Even if the exhaust gas is guided by the first collision plate 110 and flows into the boiler 11, it cannot be diffused in the boiler 11, and has a linear flow toward the blower 12. This flow direction coincides with the wear thinning portion at the rear stage of the superheater / evaporator.

  Based on this analysis result, the inside of the boiler equipment 4 was confirmed. Then, from the analysis result, the boundary portion between the dust collector 10 and the boiler 11 (the side wall having the opposing wall position 100d) that seems to be colliding due to the high flow velocity has irregularities on the castable surface, and is caused by dust collision. Abrasion was observed. In addition, no wear was observed on the back surface of each collision plate, which was considered to be slow because the flow velocity was low, and dust was deposited on the upper position of the second-stage collision plate 110. This seems to have accumulated dust because of the slow flow rate, and the analysis results were generally similar to the current situation.

  Table 1 shows the dust collection performance for each dust particle diameter in the dust collector of the reference example by flow analysis.

As shown in Table 1, about 60% of the dust having a particle size of less than 100 μm and about 100% to 200 μm can be collected. However, when the particle size is larger than 200 μm, the dust can hardly be collected. This indicates that the presence of the second collision plate 200 close to the inlet 100a side lowers the dust collecting ability with a large particle diameter.
Here, the lifetime of the blower 12 is estimated to be inversely proportional to the power of the dust concentration and the dust particle diameter. That is, when coarse particles cannot be collected, it is considered that the burden on the apparatus is very large, leading to wear / unbalance of the blower 12.

Based on the above findings, the present inventors have examined improvements in the dust collection performance of the dust collector 10.
Here, when examining the improvement of the dust collection performance, it is estimated that the enhancement / update of the dust collection device 10 can be expected to have a great effect, but there is a problem that it is costly. Also, there is no installation space around the existing boiler, and it is often difficult to increase the size. From this point of view, a measure for improving the dust collection performance was examined by remodeling the existing dust collector 10.
As described above, in the dust collecting apparatus of the reference example, the flow path of the exhaust gas is narrowed by the second collision plate 200, so that the flow rate of the upward flow of gas increases and the dust is carried over. I understood. Then, the optimization of the internal structure of the dust collector 10 was examined aiming at the maximum dust collection inside the dust collector 10 by changing the height of the collision plate.

As a result of this investigation, all the collision plates are removed, and the flow analysis is performed using the opposing wall position 100d located in the gas inflow direction from the inlet 100a as the collision wall of the exhaust gas flowing in from the inlet 100a. As a result, gas flow velocity distribution and dust particle trajectory as shown in FIG. 4 were obtained.
As can be seen from FIG. 4, by removing all the collision plates, the gas flow velocity in the dust collecting container 100 is reduced, the occurrence of contraction flow as in the reference example is suppressed, and the exhaust gas smoothly flows into the boiler 11 part. doing. Below this flow, a circulating flow is formed in which dust collides with the opposing wall position 100d and falls to collect the dust.

  That is, the inflow direction of the gas from the inlet 100a is horizontal, but the flow of the gas itself is such that the outlet 100b is located above the inlet 100a and the gas flows toward the outlet 100b. The bundle flows obliquely upward toward the outlet 100b as it approaches the outlet 100b. On the other hand, since the dust contained in the gas has inertia due to its mass, the larger the particle size, the more the dust flies substantially horizontally along the gas inflow direction at the inlet 100a as shown in FIG. It can be seen that the collision is focused on the lower position rather than the vertical center position of the facing wall position 100d. Since the coarser particle dust has a larger mass, the dust collides with a lower position than the one-third height position from the lower side of the opposing wall position 100d in the vertical direction.

Moreover, it is thought that dust with a small particle diameter carries much quantity by the gas flux of Fig.4 (a). Therefore, as shown in FIG. 2, the first collision plate 110 having the lower end of the collision plate set at a height position not less than one-third from the bottom in the vertical direction of the inlet 100a, preferably at or above the central position in the vertical direction of the inlet 100a. If it arrange | positions, it will be estimated that the dust of a fine flow diameter collides with the 1st collision board 110, and the collection efficiency of the fine flow diameter dust increases.
Here, the collision plate may be provided with the second collision plate 200 in addition to the first collision plate 110 as shown in FIG. 5. The height of the lower end of any of the collision plates 110, 200 is set above and below the inlet 100 a. What is necessary is just to set so that it may become more than 1/3 height position from the bottom of a direction, Preferably it may become more than the vertical center position of the entrance 100a.

  Thus, since the gas flow velocity is reduced and the upward flow for raising the collected dust is eliminated, as shown in Table 2, the collection ratio of dust having a large particle diameter is improved.

That is, it can be seen that by removing all the collision plates, the dust collection rate with a particle size larger than 200 μm is greatly improved. This is thought to be due to the fact that large-diameter particles having a large inertial force can no longer rise due to a decrease in gas flow rate.
On the other hand, the collection ratio of small-diameter particles having a particle size smaller than 100 μm is getting worse. This is the opposite of the large-diameter particles, and the small-diameter particles having a small inertia force are thought to have been carried over along a smooth gas flow.

Here, the “residual ratio” described in the table represents the ratio of dust that is not collected by the dust collector 10 but is not carried over to the blower 12, that is, remains in the dust collector 10 or the boiler 11. .
This residual ratio is also increased in all particle sizes in the dust collector 10 of this embodiment compared to the dust collector of the reference example. This is thought to be because the circulation region other than the mainstream was widely formed. When this residual ratio is also added to the collection ratio by the dust collector 10, it can be seen that the outflow ratio to the blower 12 is almost eliminated for dust having a particle size in the range of 100 μm to 200 μm.

Furthermore, in order to confirm the validity of the above analysis results, the effect was confirmed with an actual apparatus in which all the collision plates were removed.
First, measurement of dust was continuously performed for five months at three locations in the duct connected to the inlet 100a and outlet 100b of the dust collector 10 and the outlet of the blower 12. Then, from the measurement results, the dust particle size distribution and the cumulative proportion of dust at the three dust measurement locations were investigated, and the proportion of dust having a large particle size greatly decreased between the inlet 100a and the outlet 100b of the dust collector 10. It was. Further, dust in the vicinity of 100 μm has flowed out after the dust collector 10. Thus, it was confirmed that the results were close to those of the flow analysis.

  Moreover, the vibration value in the bearing part of the rotating shaft of the air blower 12 was measured for 3 months before and after the collision plate was completely removed. Before the removal, there was an increase in the vibration value that was necessary to correct the rotation balance of the blower 12 in about January to February, but after the impact plate was completely removed and repaired During the three months, there was no increase in vibration enough to adjust the balance, and the operation could be continued without repair and balance adjustment. Moreover, although the inside check of the apparatus was performed every month, neither the main plate or the blade plate of the blower 12 was found to be significantly damaged. As described above, since the coarse dust is removed by the dust collector 10, it is considered that the progress of wear deterioration of the blower 12 is delayed. The actual driving conditions were also as expected.

From such knowledge, the inventor suppresses the flow velocity of the exhaust gas flow that rises around the lower end portion of the collision plate for the collision plate positioned in the inflow direction of the gas flow from the inlet 100a. In order to prevent the dust from moving to the subsequent stage of the dust collector by the exhaust gas flow and to protect the performance of the boiler 11 and the blower 12 in the subsequent stage, the flow rate of the exhaust gas flow rising around the lower end of the collision plate is suppressed. As a result, the knowledge that it is necessary to set the collision plate was obtained.
As such means, the knowledge that the 1st and 2nd means should just be employ | adopted was acquired.
That is, as a first means, no collision plate is arranged in the dust collecting container 100. However, the outlet 100b is not disposed at a position located in the inflow direction of the gas flow from the inlet 100a, and the inner wall of the dust collecting container 100 is used as a collision plate.

As a second means, the distance between the lower end position of the collision plate arranged in the dust collection container 100 and the inner wall of the dust collection container 100, which is added to the structure of the first means, becomes narrower, and the lower end portion of the collision plate is In order to prevent the flow velocity of the exhaust gas flowing around and rising, the lower end of the collision plate is positioned above the dust accumulation portion 100c, preferably above the lower end position of the opening forming the inlet 100a, in particular. It is preferable to dispose the upper part of the opening forming the inlet 100a above the one-third height position from below in the vertical direction.
Further, when the collision plate is separated from the inlet 100a, the exhaust gas flowing in from the inlet 100a collides with the collision plate, and the flow velocity of the exhaust gas flow rising around the lower end of the collision plate can be suppressed. In the top view, it is preferable to arrange them closer to the outlet 100b side than the inlet 100a. More preferably, the left and right positions of the collision plate are arranged at positions that vertically oppose the lowermost end portion of the dust accumulation portion 100c.

As described above, in the dust collector 10 of the present embodiment, unlike the conventional dust collector 10, the collision plate is omitted or the height of the lower end of the collision plate is provided even if the collision plate is arranged. By disposing the position at a position higher than the conventional one, the gas flow path in the dust collection by the collision plate is narrowed to prevent the gas flow rate from increasing.
Thereby, the coarse particle size dust due to the high gas flow rate is wound up, and the coarse particle size dust is prevented from flowing into the boiler 11 and the blower 12. Therefore, it is possible to greatly reduce the load due to dust on the boiler 11 and the blower 12, particularly the blower 12, which are subsequent devices, and it is possible to reduce the repair processing of the subsequent devices.

4 Boiler equipment 10 Dust collector 11 Boiler 12 Blower 100 Dust collecting container 100a Inlet 100b Outlet 100c Dust accumulation part 100d Opposite wall position 100e Gas introduction part 110 First impact plate 120 Exhaust gas duct 200 Second impact plate

Claims (3)

A dust collecting container comprising a hopper-shaped dust depositing portion whose area of the internal space decreases as it goes downward, and a gas introducing unit surrounding a side of the space above the space in the dust depositing unit, and the gas introduction An inertial dust collector that takes in dust-containing gas from the inlet formed in the side wall of the section and sends the gas after dust collection to the boiler at the rear stage from the outlet,
The inflow direction of the gas flowing into the dust collecting container from the inlet is set so as to face the wall portion of the gas introduction portion facing the inlet in the lateral direction,
When the portion of the wall portion of the gas introduction portion facing the inlet in the lateral direction is called the facing wall position,
The outlet is disposed above the facing wall position,
Between the opposing entrance and the opposing wall position, one or more collision plates extending vertically are interposed,
The height position of the lower end of the collision plate is the same height position as a third of the upper position from the lower end of the entrance or the upper end when the vertical distance between the lower end and the upper end of the entrance is divided into three equal parts. An inertial dust collector characterized by being set at a height position higher than that. 2. The inertial force dust collector according to claim 1 , wherein the collision plate is disposed at a position closer to the outlet than the inlet in a plan view. A boiler facility in which the outlet of the inertial dust collector according to claim 1 or 2 is connected to a gas inlet of a boiler, and a suction port of a blower is connected to a gas outlet of the boiler.