WO2019131334A1

WO2019131334A1 - Soot blower device and boiler

Info

Publication number: WO2019131334A1
Application number: PCT/JP2018/046598
Authority: WO
Inventors: 三紀下郡; 康裕竹井; 康横山; 須藤　誠; 貴士出井; 智裕松尾; 杉山　友章
Original assignee: 三菱日立パワーシステムズ株式会社
Priority date: 2017-12-25
Filing date: 2018-12-18
Publication date: 2019-07-04
Also published as: KR102403110B1; JP2019113263A; JP6814727B2; KR20200089746A; PH12020500562A1

Abstract

Provided is a soot blower device (31b) that removes ash by ejecting a spray medium toward banks (7-10) in which horizontally-oriented heat transfer tubes (21) are stacked in the vertical direction and a plurality of the heat transfer tubes (21) are aligned in the lateral direction. The soot blower device (31) is characterized by the following: blower nozzles (32) are installed above and below the banks (7-10) so as to be capable of moving in the horizontal direction; the heat transfer tubes (21) are finned heat transfer tubes (21) provided with fins (23b); and a blower nozzle (32b1) above the banks (7-10) and a blower nozzle (32b2) below the banks (7-10) are disposed so as to move through positions which are deviated from each other within the horizontal plane. Due to this configuration, when removing ash from all of the heat transfer tubes, a decrease in the ash removal efficiency is suppressed and wear of the heat transfer tubes is suppressed.

Description

Soot blower apparatus and boiler

The present invention relates to a sootblower apparatus for removing ash attached to a heat transfer tube and a boiler equipped with the sootblower apparatus.

The following Patent Documents 1 to 4 are known as a sootblower for removing solid ash particles, such as pulverized coal, from which solid fuel particles such as pulverized coal are burned.

According to Patent Document 1 (Japanese Patent Application Laid-Open No. 2007-183069), in a sootblower having a spray nozzle for spraying a spray medium, the spray medium is sprayed from the large diameter spray port in the gap between the heat transfer tubes (8), A spray medium is sprayed from the small diameter spray nozzle onto the tube surface (surface) of the heat transfer tube (8) to remove the ash of the heat transfer tube (8), and transfer it by ash erosion by the ash caught in the jet. Techniques have been described to reduce the wear of the heat pipe (8). In addition, in the structure of patent document 1, the structure as which the bare tube in which the fin is not provided is used as a heat exchanger tube (8) is described.

In Patent Document 2 (Japanese Patent Application Laid-Open No. 2001-132934), a furnace (100) of a boiler is constituted of a heat transfer tube group such as a superheater (54), an evaporator (55), and a coal saving device (56). For the heat exchanger, a configuration in which a large number of soot blowers for removing ash is installed is described.

JP, 2007-183069, A ("0004"-"0008", FIG. 2, FIG. 4) JP-A-2001-132934 ("0002"-[0006], FIG. 7) JP 2002-115806 A Japanese Utility Model Application Publication No. 61-165302

As in the configurations described in

Patent Documents

1 and 2, in the heat exchanger, a tube group panel including a bare tube called a bare tube and a fin tube having fins attached to the outer periphery of the bare tube (see Patent Documents 3 and 4) It consists of And the ash adhering to a tube group panel is removed by the soot blower. In the following description, the soot blower may be simply referred to as “SB”.

FIG. 6 is an explanatory view of a range where ash is removed by the soot blower.
As described in Patent Document 1, although SB rotates and reciprocates in the furnace while rotating, since SB sprays steam (spray medium) while rotating, the range in which ash is generally removed by SB is as shown in FIG. As shown in the figure, the shape is concentric with the injection port 02 of the soot blower (SB) 01 as a center. The range from which the ash is removed by this SB01 is referred to as "SB effective range" in the present specification, and the radius Rb of the concentric circle that becomes the SB effective range is referred to as "SB reach distance".

The SB effective range is determined by the ease of ash and the strength of the jet. For example, the index of the ease of removing ash is taken as the sintering strength, and the strength of the jet against this is taken as the ash removing power. If the ash removal power by SB01 is large relative to the sintering strength of the deposited ash, the ash can be removed, and if small, the ash can not be removed, and the ash remains on the heat transfer tube 011.

FIG. 7 is an explanatory view of a jet flow injected by the soot blower.
In FIG. 7, it is known that the jet flow ejected from the nozzle toward the space spreads through the initial area including the core area, the development area, and the velocity distribution becomes flat in the width direction. When a jet is spouted from the SB nozzle toward the heat transfer tube group, the jet diffused in the width direction collides with the surface of the heat transfer tube and spreads the tube surface in the horizontal direction (mainly in the direction of the tube axis). Ash is removed. The dynamic pressure (Pt) generated by this horizontal velocity component corresponds to the removal force of SB.

Dynamic pressure Pt (ash removal power by SB) is determined by a plurality of parameters shown below. The dynamic pressure Pt is stronger in the initial region and decreases as the jet spreads, but this degree is not only the condition on the SB side, but also the positional relationship between the SB and the heat transfer tube, the heat transfer tube diameter, and the tube pitch (the heat transfer tubes It also depends on the conditions of the heat transfer tube side such as interval).
Pt = f (Dj, Pj, Ls, X1, X2, Dt, F ^* ) Formula (1)
Here, Dj: diameter of SB nozzle, Pj: injection pressure, Ls: distance from SB nozzle injection port to heat transfer pipe (SB standoff distance), X1: pipe pitch in the gas flow direction of pipe group, X2: pipe group Horizontal pipe pitch, Dt: Heat transfer tube diameter, F ^* : Parameter dependent on heat transfer tube shape. That is, the dynamic pressure Pt is represented by a function f of these parameters.

Since the ash removal power Pt of the jet must be higher than the sintering strength P _ash of the deposited ash in order to remove the ash, the condition under which the ash is removed is expressed by the following equation (2) .
Pt> P _ash ... Formula (2)

The range in which the condition of Formula (2) is satisfied is the SB effective range of the radius Rb shown in FIG. As understood from the equation (2), the ash removing power Pt also depends on the SB nozzle, a plurality of parameters on the heat transfer tube side, and the degree of sintering of the deposited ash. For example, when low-grade coal is used in a boiler, or the temperature of combustion gas is high and the sintering strength of ash is high, the conventional ash removal power Pt narrows the SB effective range and removes ash It becomes difficult.

FIG. 8 is an explanatory view of a problem of the conventional soot blower, and FIG. 8 (A) is an explanatory view when the SB effective range is narrow, and FIG. 8 (B) is an explanatory view when the SB effective range is wide.
In FIG. 8A, when the SB effective range 012 is narrow with respect to the heat transfer pipe 011, a region (a) in which the SB does not reach occurs, which causes a problem that ash tends to remain. In order to secure the conventional SB effective range 012 even when the ash removal is difficult due to the influence of coal type and gas temperature, for example, measures such as increasing the SB injection pressure Pj or increasing the number of SBs It will be necessary.
When the SB injection pressure Pj is increased, there is a problem of an increase in steam consumption (= a decrease in efficiency, a waste of steam), and an increase in the number of SB leads to an increase in initial cost and a decrease in efficiency.

On the other hand, when the SB effective range becomes excessive by increasing the SB injection pressure Pj, etc., in addition to the waste of steam, as shown in FIG. 8B, in the heat transfer pipe 011a near SB, the dynamic pressure of the jet flow Pt is too strong and may be worn out (steam erosion, steam cut), or the heat transfer tube 011 may be excessively exposed to the SB jet, so that ash erosion by the ash caught in the jet (wear by the jet containing ash) may occur. There is.

This invention makes it a technical subject to suppress abrasion of a heat exchanger tube, suppressing the fall of the efficiency which removes ash, when removing the whole ashes of a heat exchanger tube.

The object of the present invention can be achieved by adopting the following configuration.
According to the first aspect of the present invention, the horizontal heat transfer tubes having the horizontal axis as the tube axis are stacked in the vertical direction, and the stacked heat transfer tubes are arranged in multiple rows in the horizontal direction to form a bank formed inside the boiler A soot blower device that sprays the spray medium from the upper surface side and the lower surface side of the bank to remove ash, and a plurality of blower nozzles that spray the spray medium inserted from the boiler wall face above and below the bank The heat transfer tubes, which are installed so as to be movable in the horizontal direction, respectively, and which form the banks are finned heat transfer tubes having fins in a direction intersecting the tube axis, and the blower nozzle above the bank and the blower nozzle below the bank Are disposed so as to move in mutually displaced positions in a horizontal plane.

The invention according to claim 2 is the soot blower apparatus according to claim 1, wherein the moving direction of the plurality of blower nozzles is a direction intersecting with the direction of the tube axis of the heat transfer tube.

The invention according to claim 3 is the sootblower apparatus according to claim 1, wherein the moving directions of the plurality of blower nozzles are parallel to the axial direction of the heat transfer tube.

The invention according to claim 4 is directed to a plurality of banks formed by arranging a plurality of horizontal heat transfer tubes stacked in the vertical direction, the heat transfer tubes having the horizontal direction as the tube axis, and the banks facing each other. It is a sootblower apparatus which sprays a spray medium from the upper surface side and lower surface side of a bank and removes ash, and a plurality of blower nozzles which spray the spray medium inserted from a boiler wall face are horizontal direction above the bank (blower nozzle And a heat transfer tube forming at least one of the plurality of banks, in a direction intersecting the tube axis). A finned heat transfer tube provided with fins, wherein the blower nozzle above the bank and the blower nozzle below the bank are displaced from each other in the horizontal plane. Further comprising the placed sootblower device to a boiler characterized by.

The invention according to claim 5 is the boiler according to claim 4, characterized in that the moving directions of the plurality of blower nozzles are in a direction intersecting with the direction of the tube axis of the heat transfer tube.

The invention according to claim 6 is the boiler according to claim 4, characterized in that the moving directions of the plurality of blower nozzles are parallel to the axial direction of the heat transfer tube.

The invention according to claim 7 is characterized in that the blower nozzle on the upper surface side spaced apart along the tube axis direction and the blower nozzle on the upper surface side are disposed at an intermediate position between the blower nozzles on the upper surface side. It is a boiler according to claim 4, further comprising: a blower nozzle on the lower surface side.

The invention according to claim 8 is the boiler according to claim 4, characterized in that the heat transfer pipe and the soot blower apparatus disposed on the downstream side in the flow direction of the combustion gas are provided in the furnace.

According to the invention as set forth in

claims

1 and 4, the jet blown from the blower nozzle to the finned heat transfer pipe is restricted in spreading of the jet to the pipe axis as compared with the case without the fin, and the divided jet Is given directivity in the blowing direction. Therefore, the area with sufficient ash removal capacity expands in the spray direction. Therefore, even if the blower nozzle is not installed to face the both sides across the heat transfer tube, the blower nozzle disposed on one side across the heat transfer tube and the blower nozzle disposed on the other side across the heat transfer tube are By disposing at a position shifted with respect to the tube axis direction, it is possible to remove the entire ash of the heat transfer tube. Therefore, it is not necessary to increase the injection pressure of the jet while suppressing the decrease in the efficiency of removing the ash, and the wear of the heat transfer tube can be suppressed.

According to the invention as set forth in

claims

2 and 5, in addition to the effect of the invention as set forth in

claim

1 or 4, in the configuration in which the blower nozzle moves in the direction crossing the tube axial direction, the efficiency of removing ash is reduced. The wear of the heat transfer tube can be suppressed while suppressing the
According to the invention as set forth in

claims

3 and 6, in addition to the effect of the invention as set forth in

claim

1 or 4, in the configuration in which the blower nozzle moves in a direction parallel to the tube axial direction, the efficiency of removing ash is reduced. The wear of the heat transfer tube can be suppressed while suppressing the

According to the seventh aspect of the invention, in addition to the effects of the fourth aspect, the blower nozzle on the lower surface side is disposed at an intermediate position between the blower nozzles on the upper surface side, so that the entire area of the heat transfer tube can be obtained. It is easy to cover evenly and it is easy to remove whole ash efficiently.

According to the invention as set forth in claim 8, in addition to the effect of the invention as set forth in claim 4, on the downstream side of the furnace where the combustion gas is at a low temperature, the ash adhering to the heat transfer tube is efficiently removed. Can.

FIG. 1 is a schematic explanatory view of a boiler according to an embodiment of the present invention, FIG. 1 (A) is a general view, and FIG. 1 (B) is a plan view. FIG. 2 is an explanatory view of the bank portion (heat exchanger) and the soot blower of the first embodiment. FIG. 3 is an explanatory view of the heat transfer tube of Example 1, FIG. 3 (A) is an explanatory view of a heat transfer tube formed of a bare tube, and FIG. 3 (B) is an explanatory view of a heat transfer tube formed of a fin tube. It is. FIG. 4 is an explanatory view of the arrangement of the soot blower, the configuration of the heat transfer tube and the range in which the ash removal is possible, and FIG. 4 (A) is an explanatory view of the case where the heat transfer tube is bare and the soot blower is square arrangement, FIG. FIG. 4 is an explanatory view in the case where the heat transfer tubes are in a square arrangement with fin tubes, and FIG. 4C is an explanatory view in the case where the heat transfer tubes are bare tubes and the soot blower is in a staggered arrangement. FIG. 5 is an explanatory view of a modified example. FIG. 6 is an explanatory view of a range where ash is removed by the soot blower. FIG. 7 is an explanatory view of a jet flow injected by the soot blower. FIG. 8 is an explanatory view of a problem of the conventional soot blower, and FIG. 8 (A) is an explanatory view when the SB effective range is narrow, and FIG. 8 (B) is an explanatory view when the SB effective range is wide.

Hereinafter, embodiments of the present invention will be described.

FIG. 1 is a schematic explanatory view of a boiler according to an embodiment of the present invention, FIG. 1 (A) is a general view, and FIG. 1 (B) is a plan view.
In the present specification and claims, a boiler furnace may be expressed as a "can".
In FIG. 1, in the pulverized coal fired boiler 1 according to the first embodiment of the present invention, the furnace 2 has a water pipe portion 3 provided with a burner or the like (not shown). The furnace 2 has a can front wall 2a, a can rear wall 2b, and side walls 2c and 2d. Suspended

heat transfer parts

4, 5 and 6 are arranged on the ceiling of the furnace 2 along the flow direction of the combustion gas burned by the burner, and a bank (heat transfer pipe) is disposed on the can rear wall 2b side. Groups, heat exchangers) 7, 8, 9, 10 are arranged.

FIG. 2 is an explanatory view of the bank portion (heat exchanger) and the soot blower of the first embodiment.
In FIG. 2, the banks 7 to 10 of the first embodiment extend along the longitudinal direction Yb (the direction toward the can front wall 2 a and the can rear wall 2 b, the tube axis direction) of the furnace 2 intersecting the flow direction Ya of the combustion gas. It is comprised by the heat exchanger tube 21 arrange | positioned so that it may reciprocate repeatedly. In the inside of the heat transfer tube 21, steam as an example of a heat medium is flowing.

FIG. 3 is an explanatory view of the heat transfer tube of Example 1, FIG. 3 (A) is an explanatory view of a heat transfer tube formed of a bare tube, and FIG. 3 (B) is an explanatory view of a heat transfer tube formed of a fin tube. It is.
In the first embodiment, the heat transfer tubes 21 in the upstream suspended heat transfer sections (heat exchangers) 4 to 6 are configured by bare tubes (bare tubes) 22 as shown in FIG. 3A. Further, at least one bank of the heat exchangers 7 to 10 on the downstream side is constituted by a fin tube 23 in which a fin 23 b is supported on the outer surface of the tube main body 23 a. The fins 23b are formed in a spiral shape in the tube axis direction Yb. Therefore, the fins 23 b are supported crossing (in the first embodiment, inclining) the tube axis direction Yb.

An example of the SB arrangement is shown in FIG. 1. In each of the heat exchangers 4 to 10, a soot blower device 31 is arranged on the upstream side or downstream side of the flow direction Ya of the combustion gas. The soot blower apparatus 31 has a blower nozzle 32 which extends along the width direction of the furnace 2 and is movable along the width direction of the furnace. Therefore, when removing the ash, the blower nozzle 32 moves (enters) while rotating from the side walls 2 c and 2 d toward the inside of the furnace 2 and then moves (exits) to the outside.
In FIG. 1, a plurality of soot blower devices 31a for the upstream suspended heat transfer portions (heat exchangers) 4 to 6 are arranged at intervals in the vertical direction.

1 and 2, in the first embodiment, the soot blower apparatus 31b for the banks (heat exchangers) 7 to 10 on the downstream side has a horizontal direction (can front wall 2a, can rear wall 2b) intersecting the tube axis direction Yb. In the direction of The blower nozzle 32b of the downstream soot blower device 31b burns the banks 7 to 10 and the blower nozzles 32b1 disposed on the upstream side (one side, the upper surface side) of the flow direction Ya of the combustion gas with respect to the banks 7 to 10. The blower nozzle 32b2 disposed on the downstream side (the other side, the lower surface side) of the gas flow direction Ya is disposed at a position shifted with respect to the tube axial direction Yb. In particular, in the first embodiment, the downstream blower nozzle 32b2 is disposed at an intermediate position between the upstream blower nozzles 32b1 in the axial direction Yb. Therefore, the downstream blower nozzles 32b2 are in a so-called staggered arrangement.

(Operation of Example 1)
In the pulverized coal burning boiler 1 of Example 1 having the above-described configuration, at least one bank of the banks 7 to 10 disposed on the can rear side (downstream side) is configured by the fin tube 23, and the corresponding soot blower device 31b The blower nozzles 32b are arranged in a staggered manner.
In FIG. 3A, when steam is sprayed onto the bare tube 22 from the soot blower device 31a, the jet (steam) that collides with the surface of the bare tube 22 has a tube axial direction Yb and a downstream direction (suspension direction of the jet). It spreads in the heat transfer part (the thickness direction of the heat exchangers 4 to 6). On the other hand, as shown in FIG. 3B, when the steam from the blower nozzle 32b is sprayed to the fin tube 23, the fin tube 23 suppresses the expansion in the tube axial direction Yb (FIG. 3B). reference). Therefore, in the first embodiment, the jet flow blown from the sootblower device 31b to the fin tube 23 has directivity in the blowout direction (thickness direction of the banks (heat exchangers 7 to 10)) intersecting the pipe axial direction Yb. Is granted.

In FIG. 2, in the soot blower apparatus 31b on the downstream side of the first embodiment, directivity is imparted in the ejection direction, so that the jet attenuation is slow, and the ash removal power Pt is in the ejection direction In the thickness direction of the heat exchangers 7 to 10). Therefore, as shown in FIG. 2, it is possible to uniformly remove the entire heat transfer tube 21 by the downstream soot blower devices 31 b arranged in a staggered manner.

In particular, in the soot blower apparatus 31b on the downstream side of the first embodiment, the SB standoff distance Ls (the distance from the SB injection port to the heat transfer tube 21 closest to the fin tube 23), the bank thickness Tb, and the SB nozzle pitch Xlp The relationship of is set to satisfy the equations (3) and (4).
Ls = k1 · Tb formula (3)
Ls = k2 · Xlp equation (4)
In addition, k1 is 0.10 <k1 <1.83, and desirably 0.15 <k1 <0.89. Further, k2 is in the range of 0.08 <k2 <1.26, and desirably 0.13 <k2 <1.04.

Here, when k1 is smaller than the lower limit, the distance from the blower nozzle 32b of the SB device 31b to the heat transfer pipe 21 (fin tube 23) is too short, and the energy of the jet becomes excessively high, and entrains the deposited ash. Ash erosion may occur. When k1 is larger than the upper limit, the distance between the blower nozzle 32b of the SB device 31b and the heat transfer tube 21 is long, the jet stream hardly reaches, and problems such as the ash removal can not be performed sufficiently occur. Furthermore, if k2 is smaller than the lower limit, it means that the distance from the blower nozzle 32b of the SB device 31b to the heat transfer tube 21 is too short or the distance between the blower nozzles 32b is too long. In the latter case, the ash between the blower nozzles 32b tends to remain without being removed. Further, when k2 is larger than the upper limit, it means that the distance between the blower nozzle 32b of the SB device 31b and the heat transfer tube 21 is too long or the distance between the blower nozzles 32b is too short. In the latter case, jets from the adjacent blower nozzle 32b interfere with each other, resulting in overlapping and wasted waste, or SB effective ranges overlap and energy of the jets is excessively concentrated, resulting in deposited ash Cause problems such as causing ash erosion.

FIG. 4 is an explanatory view of the arrangement of the soot blower, the configuration of the heat transfer tube and the range in which the ash removal is possible, and FIG. 4 (A) is an explanatory view of the case where the heat transfer tube is a bare tube and the blower nozzle is a square arrangement. FIG. 4 is an explanatory view in the case where the heat transfer tubes are in a fin tube and in a square arrangement, and FIG. 4C is an explanatory view in the case where the heat transfer tubes are a bare tube and the blower nozzles are in a staggered arrangement.
As in the prior art, in the configuration in which the blower nozzles are squarely arranged using bare tubes, as shown in FIG. 4A, there is a problem that ash remains in the area 022 apart from the four blower nozzles 021. In addition, if the injection pressure is increased to eliminate the region 022 in which the ash remains, as described in FIG. 8B, the concern of erosion increases.

Further, in the configuration in which the blower nozzles are arranged squarely using fin tubes, as shown in FIG. 4B, a region 022 in which ash remains is generated, and a region 023 in which a range in which a sufficient injection pressure is overlapped is wide. Become. Therefore, when the overlapping area 023 becomes wide, there is a problem that the amount of the vapor consumed wastefully increases and the erosion easily progresses.
Furthermore, in the configuration in which the blower nozzles are arranged in a staggered manner using a bare tube, there is a problem that the area 022 in which the ash remains becomes wide, as shown in FIG. 4 (C).

Therefore, in the soot blower apparatus 31b on the downstream side of the first embodiment, the wear of the heat transfer tubes 21 can be suppressed while suppressing the decrease in the efficiency of removing ash without increasing the number of the soot blower apparatuses 31. The waste of can also be reduced. In addition, as in the first embodiment, by making it possible to efficiently remove ash, it is also possible to increase the mixed burning rate of low-grade coal such as sub-bituminous coal in the furnace 2, which also contributes to reduction in operation cost. Do. In addition, it will be possible to promote the use of low-grade coal, etc. for which there have been many problems with ash deposition.

FIG. 5 is an explanatory view of a modified example.
In FIG. 5, when the length in the tube axial direction Yb of the heat exchangers 7 to 10 is short, the upstream side and the downstream side of the heat exchangers 7 to 10 are not arranged as shown in FIG. It is also possible to adopt a configuration in which the blower nozzles 32b1 and 32b2 are disposed one by one on the side and disposed at a position deviated with respect to the tube axial direction Yb, so-called offset arrangement. With such a configuration, it is possible to obtain the same function and effect as those of the first embodiment.

(Other change example)
As mentioned above, although the Example of this invention was explained in full detail, this invention is not limited to the said Example, In the range of the summary of this invention described in the claim, various changes may be made. It is possible. Modifications (H01) to (H03) of the present invention are exemplified below.
(H01) Although the fin 23b has a spiral shape in the above embodiment, the invention is not limited to this. For example, a plurality of disk-shaped or polygonal plate-shaped fins may be provided at intervals in the tube axis direction Yb. At this time, it is also possible to arrange so as to be orthogonal to the tube axis direction Yb, and it is also possible to arrange so as to be inclined.

(H02) In the above embodiment, the downstream blower nozzle 32b2 is disposed at an intermediate position between the upstream blower nozzles 32b1 in the axial direction Yb. However, the present invention is not limited to this. When the position where ash is likely to be accumulated is biased according to the length in the tube axis direction of the heat exchangers 7 to 10, the positional relationship and interval between the heat transfer tubes 21, the position and length of the folded portion, the curvature radius, etc. The position of the blower nozzle 32b2 can also be changed to a position suitable for ash removal, such as being arranged apart from the axial direction of the tube, or arranged so as to be packed.
(H03) In the above embodiment, the soot blower apparatus 31 exemplarily has a configuration movable in the direction intersecting with the tube axis direction, but is not limited thereto. For example, it is also possible to move along a (parallel) direction along the tube axis direction.

1 ... boiler,
2 ... furnace,
21 ... heat transfer tube,
23a ... tube body,
23b ... Fin,
31b: soot blower device,
31b1 ... a blower nozzle disposed on one side,
31b2 ... a blower nozzle disposed on the other side,
Yb ... tube axis direction.

Claims

Horizontally arranged heat transfer tubes having a horizontal axis as a tube axis are vertically stacked, and the stacked heat transfer tubes are arranged side by side in a plurality of rows and directed to a bank formed inside the boiler, the upper surface side and the lower surface of the bank What is claimed is: 1. A sootblower apparatus for ejecting a spray medium from the side to remove ash.
A plurality of blower nozzles for injecting the spray medium, which are inserted from the boiler wall, are horizontally movably installed above and below the bank,
The heat transfer tubes forming the banks are finned heat transfer tubes provided with fins in a direction intersecting the tube axis,
A soot blower apparatus characterized in that the blower nozzle above the bank and the blower nozzle below the bank are arranged to move in mutually offset positions in a horizontal plane.
The sootblower apparatus according to claim 1, wherein the moving direction of the plurality of blower nozzles is a direction intersecting the direction of the tube axis of the heat transfer tube.
The soot blower apparatus according to claim 1, wherein the moving directions of the plurality of blower nozzles are parallel to the axial direction of the heat transfer tube.
A plurality of banks formed by arranging a plurality of horizontal heat transfer tubes stacked in the vertical direction, the horizontal heat transfer tubes being the tube axis;
It is a soot blower apparatus which sprays a spray medium from the upper surface side and the lower surface side of the bank toward the bank to remove ash, and a plurality of blower nozzles that spray the spray medium inserted from a boiler wall face is above the bank And a soot blower installed so as to be capable of reciprocating in the horizontal direction respectively and
In a boiler equipped with
The heat transfer tube forming at least one of the plurality of banks is a finned heat transfer tube having fins in a direction intersecting the tube axis,
The soot blower apparatus arranged so that the blower nozzle above the bank and the blower nozzle below the bank move at mutually offset positions in a horizontal plane,
The boiler characterized by having.
The boiler according to claim 4, wherein a moving direction of the plurality of blower nozzles is a direction intersecting with a direction of a tube axis of the heat transfer tube.
The moving direction of said several blower nozzle is parallel to the pipe-axis direction of the said heat exchanger tube. The boiler of Claim 4 characterized by these.
The blower nozzle on the upper surface side spaced apart along the tube axis direction;
The lower surface side blower nozzle disposed at a position between the upper surface side blower nozzles in the tube axis direction;
The boiler according to claim 4, further comprising:
In the furnace, the heat transfer tube and the sootblower apparatus disposed downstream of the flow direction of the combustion gas,
The boiler according to claim 4, further comprising: