JP5106967B2 - Combustion ash accumulation prevention device and duct equipped with the same - Google Patents

Description

  The present invention relates to a duct for introducing combustion gas, such as a power generation boiler, and a combustion ash accumulation preventing apparatus installed in the duct.

For example, when building a power generation boiler or the like, it is necessary to assemble the entire plant under limited location conditions due to location restrictions. For this reason, in the duct which guides the combustion gas containing the combustion ash from the boiler, it is sometimes necessary to install the duct so that the downstream side of the flow of the combustion gas has a higher gradient than the horizontal installation.
The so-called inclined duct extending in an inclined manner has a problem that combustion ash accumulates in the inclined duct when the combustion gas containing the combustion ash discharged from the boiler is introduced. In particular, the accumulation of combustion ash is remarkable when the load on the boiler is low and the flow velocity in the inclined duct is slow, or when the boiler is stopped.

In order to prevent the accumulation of the combustion ash, as shown in FIG. 6, Patent Document 1 discloses a combustion gas that is projected from the bottom 100 a of the inclined duct 100 into the inclined duct 100 and boosted up from a fan (not shown). Nozzle 102 is disclosed in which a part of the combustion gas is supplied and a part of the combustion gas boosted up toward the downstream side of the combustion gas is blown out. By blowing a part of the boosted combustion gas on the combustion ash 104 accumulated in the inclined duct 100 by this nozzle 102 and rolling it up, the combustion ash 104 is prevented from being deposited by being put on the main stream of the combustion gas again. Yes.

Japanese Patent Publication No.8-14367

  However, the nozzle 102 disclosed in Patent Document 1 has a blowout portion 102b extending in parallel to the inclined bottom portion 100a of the inclined duct 100, and is also substantially perpendicular to the upstream side of the blowout portion 102b. It has the shape which has the standing part 102a extended and connected. Therefore, in such a nozzle shape, when the combustion ash 104 accumulated to some extent collapses like an avalanche, the combustion ash 104 enters from the blowing part 102b of the nozzle 102 to the standing part 102a, and finally. There is a possibility that the entire inside of the nozzle 102 is almost blocked and the combustion gas cannot be blown out (see FIG. 6). Further, the air volume of the fan that supplies the combustion gas 105 to the nozzle may be increased so that the combustion ash 104 that has entered the nozzle 102 is blown out. However, a relatively large capacity fan is required, and there is a concern about an increase in cost.

  The present invention has been made in view of such circumstances, and provides a combustion ash accumulation preventing apparatus capable of preventing nozzle clogging due to combustion ash accumulated in an inclined duct, and a duct including the same. The purpose is to do.

In order to solve the above problems, the combustion ash deposition preventing apparatus of the present invention employs the following means.
That is, the combustion ash accumulation preventing apparatus according to the present invention is provided in the inclined duct that guides the combustion gas containing the combustion ash and extends while being inclined, and is erected from the bottom of the inclined duct toward the inclined duct. A nozzle having a standing portion, a blowing portion communicating with the standing portion and blowing the gas toward the downstream side of the combustion gas, and supplying the gas so as to flow from the standing portion to the blowing portion In the combustion ash deposition preventing device comprising the gas supply means, the blowing portion is disposed at a position lower than the standing height of the standing portion, and between the standing portion and the blowing portion, A descending portion that is folded back from the standing portion and descends toward the bottom of the inclined duct toward the blowing portion is provided , and a lid member that can be opened and closed with respect to the inside of the inclined duct is provided at the blowing portion of the nozzle. It is provided To.

According to the present invention, even when combustion ash accumulates at the bottom of the inclined duct and enters the nozzle from the blowing portion, the blowing portion of the nozzle is disposed at a position lower than the standing height of the standing portion. And a descending part is provided between the standing part and the blowing part, which is folded from the standing part and descends toward the bottom part of the inclined duct toward the blowing part. It does not reach the standing part beyond. In other words, even when combustion ash is accumulated in the blowing part of the nozzle, the accumulated combustion ash stops in the blowing part and does not block the standing part. The combustion ash accumulated in the section can be discharged out of the nozzle. Therefore, the nozzle is not blocked by the combustion ash.

In addition , even when combustion ash accumulates in the inclined duct and tries to enter the nozzle from the blowing portion, a lid member that can be opened and closed with respect to the inclined duct is provided in the blowing portion of the nozzle. The combustion ash does not enter the nozzle, and the nozzle is not blocked by the combustion ash.
For example, when blowing gas from the nozzle, the lid member opens by the blowing force, and when the gas is not blown, the lid member is closed and does not open even when force is applied from the outside of the nozzle. According to this structure, it is possible to reliably prevent the accumulated combustion ash from entering the nozzle. Therefore, the prevention of nozzle clogging by combustion ash can be further enhanced.

  Furthermore, the combustion ash accumulation preventing apparatus of the present invention is characterized in that the nozzle is provided with wear prevention means for preventing wear due to the flow of combustion gas containing combustion ash.

  According to the present invention, even when the nozzle is exposed to the combustion gas containing the combustion ash flowing in the inclined duct for a long time, the nozzle is provided with the wear prevention means. Nozzle wear due to the influence of gas can be prevented. Therefore, the life of the nozzle can be greatly improved.

  Further, in the deposition preventing apparatus according to the present invention, the upstream portion of the inclined duct is connected to a horizontal duct, and a hopper for separating the combustion ash and the combustion gas is provided in the vicinity of the connecting portion between the inclined duct and the horizontal duct. A nozzle that blows gas toward the hopper is provided upstream of the hopper.

When the load on the boiler is low and the flow velocity in the inclined duct is slow, or when the boiler is stopped, the combustion ash accumulated in the inclined duct collapses like an avalanche and tends to accumulate at the connection between the inclined duct and the horizontal duct However, a hopper is provided in the vicinity of the inclined duct and the horizontal duct, and further, gas is blown from the nozzle provided upstream of the hopper to the hopper side, so that the combustion ash is guided to the hopper without accumulating in the duct connection part. Further, the rolled up combustion ash is put on the main stream of the combustion gas and guided downstream. Therefore, it is possible to prevent the nozzle provided in the vicinity of the duct connection portion from being buried and blocked by the accumulation of combustion ash.

  Furthermore, the combustion ash accumulation preventing apparatus of the present invention described above is characterized in that a part of the combustion gas is used as the gas blown out from the nozzle.

  According to the present invention, by circulating a part of the combustion gas in the gas blown from the nozzle, the temperature change in the duct can be reduced as compared with the case where the external air is introduced and blown out. it can. Therefore, solidification of combustion ash can be prevented, unburned components flowing in the duct can be prevented from burning, and damage to the duct can be prevented.

  Furthermore, the duct according to the present invention is a duct provided with an inclined duct that guides the combustion gas containing combustion ash and extends while inclining, and a horizontal duct connected to an upstream portion of the combustion gas flow of the inclined duct. One of the above-described combustion ash accumulation preventing devices is provided.

  According to the present invention, in a duct provided with an inclined duct that guides the combustion gas containing combustion ash and extends while inclining, and a horizontal duct connected to the upstream side of the combustion gas flow of the inclined duct, By providing the combustion ash accumulation preventing device according to any one of claims 1 to 5, the combustion ash accumulation prevention device is inclined so as to have a gradient in which the wake side of the combustion gas flow becomes higher due to location restrictions. Even when combustion ash accumulates in the installed inclined duct and the duct in which the horizontal duct is connected to the upstream portion of the inclined duct, blockage of the nozzle is prevented. Therefore, the combustion gas containing combustion ash can be favorably guided in the duct.

  According to the combustion ash accumulation preventing apparatus of the present invention, even when the nozzle has entered the nozzle from the nozzle blowing portion, the nozzle blowing portion is disposed at a position lower than the standing height of the standing portion, In addition, since a descending part is provided between the standing part and the blowing part, which is folded back from the standing part and descends toward the bottom part of the inclined duct toward the blowing part, the combustion ash stands over the descending part. Never reach the department. In other words, even when combustion ash is accumulated in the blowing part of the nozzle, the accumulated combustion ash stops in the blowing part and does not block the standing part. The combustion ash accumulated in the section can be discharged out of the nozzle. Accordingly, stable gas blowing from the nozzle can be performed, and work such as removal of combustion ash clogged in the nozzle becomes unnecessary.

  Furthermore, according to the duct of the present invention, the duct includes an inclined duct that guides the combustion gas containing the combustion ash and extends while being inclined, and a horizontal duct that is connected to the upstream side of the combustion gas flow of the inclined duct. By providing the combustion ash accumulation preventing device according to any one of the above, an inclined duct installed to be inclined so as to have a higher gradient on the wake side of the combustion gas flow due to location restrictions, and the inclined duct Even when combustion ash accumulates in a duct connected to a horizontal duct on the upstream side of the nozzle, a stable gas supply is performed by preventing nozzle clogging, and combustion gas containing combustion ash is contained in the duct Can be guided well.

Embodiments according to the present invention will be described below with reference to the drawings.
[First embodiment]
A first embodiment of the present invention will be described with reference to FIG.
FIG. 1 shows a front view of a nozzle of the combustion ash accumulation preventing apparatus according to the first embodiment of the present invention. Specifically, an inclined duct 1 for guiding combustion gas containing combustion ash from a power generation boiler is shown. The inclined duct 1 is disposed so as to have a gradient that becomes higher on the downstream side of the combustion gas flow.
A nozzle 2 is provided at the bottom 1 a of the inclined duct 1. Although only one nozzle 2 is shown in the figure, a plurality of nozzles 2 are actually provided in the longitudinal direction of the inclined duct 1 as will be described later with reference to FIG. The nozzle 2 includes a standing portion 2a erected from the bottom portion 1a of the inclined duct 1 and a blowout portion 2b that communicates with the erected portion 2a and blows out gas toward the downstream side of the combustion gas flowing in the inclined duct 1. And have. The blowing part 2b is arrange | positioned in the position lower than the standing height of the standing part 2a. That is, the top of the standing portion 2a is positioned higher than the blowing portion 2b. Between the standing part 2a and the blowing part 2b, there is provided a descending part 2c that is folded back from the standing part 2a and descends to the bottom part 1a of the inclined duct 1 toward the blowing part 2b.
The nozzle 2 has a circular cross section, and the communicating portion 2d that communicates the standing portion 2a and the descending portion 2c is in a state of forming an arc shape when viewed from the front (see FIG. 1).
A gas supply means (not shown) is connected to the lower portion of the nozzle 2 via a gas supply pipe (not shown). A flow rate control valve (not shown) for adjusting the flow rate of the gas 9 supplied to the nozzle 2 is provided in the middle of the gas supply pipe. The downstream side of the inclined duct 1 is connected to, for example, a chimney or a dust collector (not shown).

  Note that the blowing angle of the blowing portion 2b of the nozzle 2 described above is adjusted so as to blow substantially parallel to the bottom portion 1a of the inclined duct 1. Alternatively, it is preferable to make an angle toward the bottom 1a side and blow it out slightly at an angle. Thereby, combustion ash 4 can be rolled up moderately.

According to this embodiment described above, the following operational effects are obtained.
Combustion gas containing combustion ash discharged from a power generation boiler (not shown) is guided into the inclined duct 1 from the direction of the arrow 11 shown in FIG.

A gas 9 is supplied to the nozzle 2 from a gas supply means (for example, a blower) (not shown), and is blown out from the blowing portion 2 b toward the downstream side in the inclined duct 1. The flow rate of the gas 9 supplied to the nozzle 2 is adjusted to an appropriate flow rate by a flow rate control valve (not shown). The combustion ash 4 is rolled up by blowing the gas 9 to the combustion ash 4 deposited on the bottom 1a of the inclined duct 1. The rolled up combustion ash 4 joins the main flow of combustion gas flowing in the inclined duct 1 and is guided downstream. The flow rate of the gas supplied from the gas supply means is adjusted by a flow rate control valve provided in the middle position of the gas supply pipe.
The combustion gas flowing in the inclined duct 1 is guided to the chimney connected to the downstream side of the inclined duct 1 and released to the atmosphere, and the combustion ash 4 is guided to the dust collector.

  In the inclined duct 1, the combustion ash 4 is gradually deposited on the bottom 1a. The accumulated combustion ash 4 collapses like an avalanche to the upstream side of the inclined duct 1 particularly when the load on the boiler is low and the flow velocity in the inclined duct 1 becomes slow or when the boiler stops. The combustion ash 4 that has fallen down enters the nozzle 2 from the blowout part 2b as shown in FIG.

On the other hand, in this embodiment, the blowing part 2b of the nozzle 2 is arrange | positioned in the position lower than the standing height of the standing part 2a, and also, it stands between the standing part 2a and the blowing part 2b. A descending portion 2c is provided that is folded from the installation portion 2a and descends toward the bottom portion 1a of the inclined duct 1 toward the blowing portion 2b.
For this reason, even if the combustion ash 4 accumulates on the bottom 1a of the inclined duct 1 and enters the nozzle 2 from the blowing part 2b, the accumulated combustion ash 4 stops only at the blowing part 2b part, Since the combustion ash 4 does not reach the standing portion 2a, the standing portion 2a can be prevented from being blocked. Therefore, by supplying the gas 9 from the gas supply means, the combustion ash 4 accumulated in the blowing part 2b can be discharged out of the nozzle 2, and the nozzle 2 can be prevented from being blocked by the combustion ash 4 and stabilized. 9 speech bubbles can be created.
Note that the flow rate of the gas 9 supplied to the nozzle 2 can supply a flow rate that can sufficiently discharge the combustion ash with the existing blowing function force even when the blowout part 2b is closed with the combustion ash 4. It is not necessary to use a large capacity blower.

Further, as shown in FIG. 2, a lid member 30 that can be opened and closed with respect to the inside of the inclined duct 1 may be provided in the blowing portion 2 b of the nozzle 2.
As a result, even if the combustion ash 4 accumulates on the bottom 1a of the inclined duct 1 and tries to enter the nozzle 2 from the blowout part 2b, the cover member 30 causes the combustion ash 4 to enter from the blowout part 2b. Can be prevented.

When the gas 9 is blown from the blowing portion 2b of the nozzle 2, the lid member 30 is opened to a state like the lid member 30b indicated by a two-dot chain line in FIG. On the other hand, when air is not blown out, it is in a closed state like a lid member 30a indicated by a solid line. In this closed state, a force from the outside of the nozzle 2 is applied, that is, when the combustion ash 4 tries to enter the blowing portion 2b, the lid member 30a does not open, so-called a non-return lid structure. It is possible to reliably prevent the combustion ash 4 deposited on the bottom 1a of the duct 1 from entering the nozzle 2 from the blowout part 2b. Therefore, it is possible to further enhance the prevention of the nozzle 2 from being blocked by the combustion ash 4.
The lid member 30 has a structure that can be opened and closed by a hinge member, for example.

Further, as shown in FIG. 3, the nozzle 2 may be provided with a protector 50 as a wear preventing means for preventing the nozzle 2 from being worn by the combustion gas flowing in the inclined duct 1. The protector 50 is provided from the standing part 2a to the upstream side of the communication part 2d.
If the nozzle 2 is exposed to the combustion gas containing the combustion ash flowing in the inclined duct 1 for a long time, a problem occurs that the nozzle 2 is worn. In particular, the nozzle 2 is most easily affected by the upstream side surface of the combustion gas flow indicated by the arrow 11 and is easily worn. By providing the protector 50, wear can be prevented even when the nozzle 2 is exposed to the combustion gas for a long time. Therefore, the life of the nozzle 2 can be significantly improved.

Furthermore, in the blowing part 2b of the nozzle 2, it is good also as a taper shape that a blowing part becomes narrow gradually.
According to this, while the combustion ash 4 becomes difficult to enter from the blowing part 2b, the flow velocity of the gas 9 blown from the blowing part 2b can be increased.

[Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to FIG.
FIG. 4 shows a front view of the nozzle of the combustion ash accumulation preventing apparatus according to the second embodiment of the present invention. Unlike the first embodiment, which has a pipe shape, the nozzle of this embodiment has a box shape.
The figure shows an inclined duct 10 for guiding combustion gas containing combustion ash from a power generation boiler. As in the first embodiment, the inclined duct 10 is disposed so as to have a gradient that increases the downstream side of the combustion gas flow. A nozzle 20 is provided at the bottom 10 a of the inclined duct 10, and this nozzle 20 communicates with the standing part 20 a standing from the inclined duct 10 and the standing part 20 a, It has a blow-out part 20b that blows out gas toward the downstream side of the combustion gas flowing through. The blowing portion 20b is disposed at a position lower than the standing height of the standing portion 20a, and is inclined from the standing portion 20a to the blowing portion 20b between the standing portion 20a and the blowing portion 20b. A descending portion 20c descending to the bottom portion 10a of the ten is provided. The nozzle 20 has a rectangular cross section, and is formed such that the upstream side surface of the standing portion 20a is adjacent to the downstream side surface of the descending portion. Similar to the first embodiment, the top of the standing portion 20a is positioned higher than the blowing portion 20b (see FIG. 4).
About the structure concerning supply of the gas 9 to the nozzle 20, it is the same as that of 1st Embodiment, The description is abbreviate | omitted.

  Further, the blowing angle of the blowing portion 20b of the nozzle 20 described above is blown out substantially horizontally with the bottom portion 10a of the inclined duct 10, or is inclined toward the bottom portion 10a side, as in the first embodiment. It is preferable to blow off at a slight downward angle, and the combustion ash can be wound up moderately.

According to this embodiment described above, the following operational effects are obtained.
Similar to the first embodiment described above, in the inclined duct 10, the combustion ash 40 is gradually deposited on the bottom 10a. The accumulated combustion ash 40 collapses like an avalanche to the upstream side of the inclined duct 10 particularly when the load on the boiler is low and the flow velocity in the inclined duct 10 becomes slow or when the boiler stops. As shown in FIG. 4, the combustion ash 40 that has fallen down enters the nozzle 20 from the blowout portion 20 b.
On the other hand, in this embodiment, the blowing part 20b of the nozzle 20 is arrange | positioned in the position lower than the standing height of the standing part 20a, and also, it stands between the standing part 20a and the blowing part 20b. A descending portion 20c is provided that is folded from the installation portion 20a and descends toward the bottom portion 10a of the inclined duct 10 toward the blowing portion 20b.
For this reason, even when the combustion ash 40 accumulates on the bottom 10a of the inclined duct 10 and enters the nozzle 20 from the blowing part 20b, the accumulated combustion ash 40 stops only at the blowing part 20b part, Since the combustion ash 40 does not reach the standing portion 20a, the standing portion 20a can be prevented from being blocked. Therefore, by supplying the gas 9 from a gas supply means (not shown), the combustion ash 40 accumulated in the blowing part 20b can be discharged out of the nozzle 20, and the nozzle 20 is prevented from being blocked by the combustion ash 40 and stable. Can be blown out.

  Also in the nozzle 20 of the present embodiment, a lid member that can be opened and closed with respect to the inside of the inclined duct 10 may be provided in the blowing portion 20b as in the first embodiment described above, or the high temperature flowing in the inclined duct 10 may be provided. It is good also as providing a protector as an abrasion prevention means for preventing abrasion of the nozzle 20 by this combustion gas. (See Figs. 2 and 3)

  Furthermore, as in the first embodiment, the outlet 20b of the nozzle 20 may have a tapered shape such that the outlet is gradually narrowed.

[Third embodiment]
Next, a third embodiment of the present invention will be described with reference to FIG.
FIG. 5 shows a schematic view of a duct in which the combustion ash accumulation preventing apparatus according to the third embodiment of the present invention is installed.
Specifically, an inclined duct 1 for guiding combustion gas containing combustion ash from a power generation boiler and a horizontal duct 8 are shown. The inclined duct 1 is installed so as to have a gradient that increases the downstream side of the combustion gas flow. The horizontal duct 8 is connected to the upstream side of the inclined duct 1. A hopper 3 is provided on the horizontal duct 8 side of the connecting portion where the inclined duct 1 and the horizontal duct 8 are connected.
A plurality of nozzles 2 installed from the bottoms of the inclined duct 1 and the horizontal duct 8 into the ducts 1 and 8 are provided. Each nozzle 2 includes a standing part 2a standing in the ducts 1 and 8, and a blowing part 2b for communicating with the standing part 2a to blow gas toward the downstream side of the combustion gas flow. have.
A gas supply pipe 5 is connected to the lower portions of the plurality of nozzles 2. The gas supply pipe 5 is connected to a blower 7 as a gas supply means via a flow rate control valve 6 (see FIG. 5).

  In this embodiment, an example using the nozzle of the first embodiment described above is shown, but the box-shaped nozzle of the second embodiment may be applied.

According to this embodiment described above, the following operational effects are obtained.
The combustion gas containing the combustion ash discharged from the boiler is guided to the inclined duct 1 through the horizontal duct 8 from the direction of the arrow 11 shown in FIG.

Gas is supplied to the nozzle 2 by the blower 7 and blown out from the blowing portion 2 b toward the downstream side in the inclined duct 1. The flow rate of the gas supplied to the nozzle 2 is adjusted to an appropriate flow rate by the flow rate control valve 6 provided in the middle position of the gas supply pipe 5. Then, the combustion ash is rolled up by blowing gas to the combustion ash deposited on the bottoms of the inclined duct 1 and the horizontal duct 8. The rolled up combustion ash joins the main flow of combustion gas flowing through the inclined duct 1 and the horizontal duct 8 and is guided downstream.
The combustion gas flowing in the inclined duct 1 is guided to a chimney (not shown) connected to the downstream side of the inclined duct 1 and released to the atmosphere, and the combustion ash is guided to a dust collector (not shown). It becomes.

  When the boiler performs a low load operation, the flow velocity of the combustion gas containing the combustion ash flowing in the inclined duct 1 and the horizontal duct 8 becomes slow, and in particular, the combustion ash is likely to accumulate on the bottom portion 2 in the inclined duct 1. Become. Alternatively, combustion ash is likely to be deposited on the bottom 1a in the inclined duct 1 when the boiler is stopped. In this case, the accumulated combustion ash collapses like an avalanche, accumulates in the vicinity of the connection portion between the inclined duct 1 and the horizontal duct 8, and covers the entire nozzle 2 provided in the vicinity of the connection portion. Sometimes.

On the other hand, in the present embodiment, the hopper 3 for separating the combustion ash and the combustion gas is provided on the horizontal duct 8 side in the vicinity of the connection portion between the inclined duct 1 and the horizontal duct 8, and further upstream of the hopper 3. Nozzle 2 is provided.
For this reason, even if the combustion ash deposited on the bottom 1a of the inclined duct 1 collapses and easily accumulates at the connecting portion between the inclined duct 1 and the horizontal duct 8, it is provided on the horizontal duct 8 side in the vicinity of the connecting portion. In addition, the combustion ash is not deposited at the connecting portion between the inclined duct 1 and the horizontal duct 8 by blowing out the gas from the nozzle 2 provided on the upstream side of the hopper. Therefore, even if it is the nozzle 2 provided in the connection part vicinity, it can blow out gas stably, without being buried and obstruct | occluded with combustion ash.
Note that the flow rate of the gas supplied to the nozzle 2 can sufficiently discharge the combustion ash with the capacity of the existing blower 7 even when the blowout part 2b is closed with the combustion ash 4 as in the first embodiment. A flow rate can be supplied, and there is no need to newly use a large capacity blower.

Further, as described above, the gas blown out from the plurality of nozzles 2 of the present embodiment is supplied from the blower 7. At this time, the flow rate of the gas supplied to each nozzle 2 is adjusted by the flow rate control valve 6 provided in the middle position of the gas supply pipe 5, but it is provided upstream of the combustion gas flow. The nozzles are blown out at predetermined time intervals in the order of the nozzles on the downstream side from the existing nozzles. This is because the flow velocity of the combustion gas decreases toward the downstream side, and the flow velocity of the combustion gas can be stabilized by blowing the gas in order from the nozzle on the upstream side.
If the capacity of the blower 7 is taken into consideration, it is sufficient that any one nozzle always blows gas, and it is not necessary to blow out all the nozzles simultaneously.

  Note that the gas blown out from the plurality of nozzles 2 of the present embodiment is preferably used by boosting and circulating a part of the combustion gas flowing in the duct with the blower 7. Thereby, the temperature difference between the temperature in the inclined duct 1 and the horizontal duct 8 and the temperature of the combustion gas blown out from the nozzle 2 can be made smaller than the air from the outside. Therefore, solidification of combustion ash in the duct can be prevented, and damage to the duct can be prevented by avoiding burning of unburned components flowing in the duct.

  In addition, this invention is not limited to the invention concerning embodiment mentioned above, In the range which does not deviate from the summary change, it can change suitably.

It is a front view which shows the nozzle of the combustion ash deposition prevention apparatus concerning one Embodiment of this invention. It is a front view which shows the structure provided with the cover member in the nozzle of FIG. It is a front view which shows the structure provided with the abrasion prevention means in the nozzle of FIG. It is a front view which shows the nozzle of the combustion ash deposition prevention apparatus concerning one Embodiment of this invention. It is the schematic of the duct provided with the combustion ash deposition prevention apparatus concerning one Embodiment of this invention. It is a front view which shows the nozzle of the conventional combustion ash deposition prevention apparatus.

Explanation of symbols

1, 10, 100 Inclined duct 2, 20, 102 Nozzle 2a, 20a, 102a Standing part 2b, 20b, 102b Outlet part 3 Hopper 4, 40, 104 Combustion ash 5 Gas supply pipe 6 Flow control valve 7 Blower (gas supply) means)
8 Horizontal duct 9 Gas 30 Lid member 50 Protector

Claims (5)

It is provided in an inclined duct that guides the combustion gas containing combustion ash and extends at an inclination,
A standing portion standing from the bottom of the inclined duct toward the inside of the inclined duct, and a nozzle having a blowout portion that communicates with the standing portion and blows gas toward the downstream side of the combustion gas;
Gas supply means for supplying the gas so as to flow from the standing portion to the blowing portion;
In the combustion ash accumulation prevention device provided with
The blowing portion is disposed at a position lower than the standing height of the standing portion,
Between the standing portion and the blowing portion, a descending portion is provided that is folded from the standing portion and descends toward the bottom portion of the inclined duct toward the blowing portion ,
A combustion ash accumulation preventing device , wherein a lid member that can be opened and closed with respect to the inside of the inclined duct is provided at the blowing portion of the nozzle . 2. The combustion ash accumulation preventing apparatus according to claim 1, wherein the nozzle is provided with wear prevention means for preventing wear due to a flow of the combustion gas containing the combustion ash. 3. An upstream portion of the inclined duct is connected to a horizontal duct, and a hopper for separating the combustion ash and the combustion gas is provided in the vicinity of the connecting portion between the inclined duct and the horizontal duct, and upstream of the hopper, the hopper The apparatus for preventing combustion ash accumulation according to claim 1 or 2, wherein a nozzle for blowing gas is provided on the hopper side. The combustion ash accumulation preventing apparatus according to any one of claims 1 to 3 , wherein a part of the combustion gas is used as the gas blown from the nozzle. In a duct provided with an inclined duct that guides the combustion gas containing combustion ash and extends at an inclination, and a horizontal duct connected to an upstream portion of the combustion gas flow of the inclined duct,
A duct comprising the combustion ash accumulation preventing device according to any one of claims 1 to 4 .

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