JPH1151301A - Furnace wall tube structure at burner section - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a furnace wall tube structure at burner section in which the possibility of burning the furnace wall with flame is reduced while enhancing the cooling performance of refractories. SOLUTION: An opening 3 for setting a round burner 2 is made at the corner part of a furnace wall 1. On the periphery of the opening, furnace wall tubes are arranged while being bent to stretch inward from the furnace wall 1 at the corner part toward the opposite corner part. They are also bent in the lateral direction to form a space for providing an opening. Refractories are arranged in that space while stretching toward the inside 4 of the furnace and supported by the furnace wall tubes on the periphery of the opening.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a furnace wall comprising a plurality of furnace wall tubes which are arranged adjacent to each other in a plane. The present invention relates to a burner furnace wall tube structure in which an opening for installing a burner for feeding (hereinafter, simply referred to as fuel) is provided, and is particularly suitable when a round burner opening is provided in a corner of a furnace wall. For the burner wall structure.

[0002]

2. Description of the Related Art In order to provide a round burner for feeding fuel into a furnace of a boiler on a furnace wall, a part of the furnace wall formed by arranging furnace wall tubes adjacent to each other is formed. It is necessary to have a burner furnace wall tube structure in which an opening of a burner to be installed is provided.

As shown in FIG. 5, a plurality of round burners 05 are provided with openings 06 in the vertical and / or horizontal direction of the front wall 03 and / or the rear wall 02 of the flat furnace wall 01. In the case where the burner unit furnace wall tube structure 010 is provided in the boiler thus manufactured, conventionally, the burner unit furnace wall tube structure 010 in which an opening formed as shown in FIGS. I am trying to do it.

[0004] That is, as shown in the figure, when such a burner section furnace wall tube structure 010 is provided, a furnace wall tube 07 forming a furnace wall 01 disposed at a position where an opening 06 is provided.
First, as shown in FIG. 7, is bent in the left-right direction to form a space for the opening 06 of the round burner 05 in the left-right bent portion, and is provided in the front-rear direction orthogonal to the furnace wall 01, In order to support the refractory material 09 forming the throat portion of the opening 06, as described above, the furnace wall tube 07 bent in the left-right direction is further provided on the periphery of the opening 06, as shown in FIGS. As shown in FIG. 8, the furnace wall tube 07 is bent rearward on the outside of the furnace, and the furnace wall tube 07 is vertically and horizontally symmetrical at the peripheral edge of the opening 06, and is also arranged so as to overlap in the front-rear direction. In the periphery of 06, a three-dimensionally arranged burner part furnace tube structure 0 that protrudes toward the outside of the furnace.
10 are formed.

In these figures, reference numeral 08 denotes a straight tubular furnace wall tube which forms only the furnace wall 01 without forming the opening 06, 04 denotes a side wall formed only by the straight tubular furnace wall tube 08,
Numeral 11 denotes the inside of the furnace, 012 denotes the above-mentioned fuel fed into the furnace 011, 13 denotes a flame generated in the furnace 011, and 014 denotes a stud buried in the refractory material 09.

[0006] The burner section furnace wall tube structure 010 is provided on a flat furnace wall 01 as shown in FIG.
5 from the opening 06 to the center of the furnace 011
No particular problem arises when steam is generated by feeding in the furnace 2, but such a burner section furnace wall tube structure 010 is formed as shown in FIG.
As shown in the figure, the opening 06 of the round burner 05 is
A problem arises in the case of adopting a boiler which is provided in the corner portion 11 and feeds fuel 012 into the furnace 011 so as to swirl the inside of the furnace 011 and performs swirling combustion.

That is, the opening 06 of the round burner 05
Is provided in the corner portion of the furnace 011 for combustion, the flame 013 burning and swirling in the furnace 011 is
A swirling flow is generated as shown in FIG.
13 has a characteristic of easily approaching the furnace wall 01 forming the corner portion of the furnace interior 011, particularly the furnace wall 01 on the downstream side of the flame, so that it directly contacts the furnace wall 01 on the downstream side of the flame forming the corner portion. And the possibility of increasing the burnout of the furnace wall 01 arises.

In order to avoid this possibility, the front end of the refractory material 09 forming the opening 06 of the round burner 05 is provided so as to be advanced toward the inside of the furnace 011 so as to be provided. The front end is arranged so as to be at the point A shown in FIG. 2, so that the flame 013 does not directly hit the furnace wall 01 on the downstream side, thereby preventing burnout. In this case, the thickness of the refractory material 09 forming the opening portion 06 in the front-rear direction increases, and particularly, the weight of the portion protruding into the furnace 011 increases, and the refractory material 09 overlaps behind the furnace wall 01 and overlaps behind. In the furnace wall tube 07 that forms the protruding three-dimensionally shaped furnace wall 01, it becomes difficult to support the weight of the refractory material 09 and the cooling of the refractory material 09 becomes insufficient, so that the refractory material 09 becomes insufficient. There is a problem that there is a possibility that the battery 09 is burned.

Further, in order to support the increasing weight of the refractory material 09, the furnace is superimposed in the front-rear direction and arranged three-dimensionally behind the furnace wall 01 so as to support the weight of the refractory material 09. A number of additional wall tubes 07 are also provided to increase the supporting force of the opening 06.

In this case, the number of bending processes of the furnace wall tube 07 for forming the opening 06 is further increased, and further, the length of the furnace wall tube 07 is increased, and the cost is increased. There is. In particular, in a case where the openings 06 of the round burners 05 are arranged above and below the furnace 011 to make a compact boiler structure, the upper round burners 05 and the lower round burners 05 are connected to each other. When the required furnace wall tube 07 is to be bent back with the opening 06, the bending radius must be reduced, and a large number of bends having a small bending angle must be used. As the pressure increases, the pressure loss of the fluid flowing in the furnace wall tube 07 increases, and the flow rate in the tube decreases.

[0011]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned disadvantages of the conventional burner part furnace wall tube structure in which a round burner opening is provided at the corner part of the furnace wall. In order to prevent the flame that burns and swirls in the furnace from hitting the furnace wall on the downstream side of the flame, the front end of the opening of the round burner is advanced to the inside of the furnace and the opening is formed. The tip of the material is extended to the inside of the furnace, and especially, even if the weight of the refractory material protruding inside the furnace becomes large, the bending process of the furnace wall tube increases and the length becomes long. In particular, in the case of a boiler having a compact structure in which round burners are arranged above and below the furnace, the bending required between the upper round burner and the lower round burner is required. The bend radius when returning can be reduced, and many bends with a small bending angle It is not necessary to add a large number of furnace wall pipes that need to be used, it can sufficiently support the refractory material that protrudes inside the furnace at the opening, and can sufficiently cool the refractory material, An object of the present invention is to provide a burner part furnace wall tube structure which eliminates the possibility of occurrence of the above problem, does not increase the pressure loss of the fluid flowing in the furnace wall tube, and does not reduce the flow rate in the tube.

[0012]

For this reason, the burner section furnace wall tube structure of the present invention has the following means.

(1) A furnace wall tube provided around an opening for providing a burner opening at a corner portion of a furnace wall formed by arranging a plurality of furnace wall tubes in parallel is as follows. The furnace wall was formed by bending so as to form a furnace wall, and also used as a support material for the opening.

(I) A space is provided which is bent from the furnace wall of the corner portion to the opposite corner portion so as to project toward the inside of the furnace, and has an opening for generating a swirling flow in the furnace. (Ii) It is provided so as to also serve as a support member for supporting a refractory material which is formed so as to form an opening of a burner, which is provided by being advanced from the furnace wall toward the inside of the furnace.

The furnace wall tube bent inside the furnace is:
At the periphery of the opening, it is also bent in the left and right direction to provide a space for the opening, and forms a space for providing an opening which is vertically symmetrical, and is arranged so as to overlap in the front and rear direction, It is preferable to form a three-dimensionally arranged furnace wall inside the furnace at the periphery of the opening. In addition, the furnace wall tube arranged at the peripheral edge of the opening is arranged to be expanded left and right in the upper and lower portions near the opening, so that the fins of the furnace wall tube are prevented from being burned out. It is preferable to provide a refractory material fixed by studs. In addition, the opening to be supported by the furnace wall tube is supported by the furnace wall tube arranged so that the refractory material forming the opening can be cooled substantially uniformly, and a stud is also inserted into the refractory material. It is preferable to be able to support and cool.

The burner furnace wall tube structure of the present invention comprises: a. The burner can be moved forward inside the furnace to arrange the opening of the burner.Furthermore, the fuel supplied into the furnace by this burner burns and the swirling flame does not hit the furnace wall on the downstream side of the flame. The possibility of burning of the furnace wall by the flame can be reduced, and even if the weight of the refractory material forming the opening that is arranged to be advanced to the inside of the furnace as the burner advances to the inside of the furnace increases, Since it is supported by the furnace wall tube which is arranged to be advanced, the bending process is increased and it becomes possible to sufficiently support the furnace wall tube without adding a furnace wall tube having a longer length. Cooling can be sufficiently performed, and the possibility of burnout can be further reduced.

Furthermore, even when a burner is installed above and below the furnace to make the boiler compact, the furnace wall tube is bent and disposed so as to project inside the furnace. The bend used for the bent part can be reduced, and the bending radius required when returning the furnace wall tube between the upper round burner and the lower round burner can be increased. Further, since it is not necessary to use a bend having a small bending angle, the pressure loss of the fluid flowing through the furnace wall tube does not increase, and the flow rate in the tube can be prevented from being reduced.

Further, the second aspect of the present invention relates to a burner section furnace wall tube structure of the present invention. (2) By means of the above (1), the furnace wall tube extending from the opening toward the inside of the furnace is provided without extending toward the inside of the furnace at the furnace wall around the opening. Is supported by a rear furnace wall tube forming a furnace wall behind the furnace wall tube. It is preferable that the furnace wall tube supported by the rear furnace wall tube is supported by interposing a support metal between the furnace wall tube and the rear furnace wall tube.

The burner furnace wall tube structure of the present invention has the above-described a. In addition, a furnace wall tube provided to protrude from the opening toward the inside of the furnace is firmly fixed by the rear furnace wall tube. In addition, the thick refractory material interposed between the furnace wall tube and the rear furnace wall tube to protect the fins of the furnace wall tube and the rear furnace wall tube, together with the studs inserted therein, together with the furnace wall tube. Since it is firmly fixed by the rear furnace wall tube and further cooled by these, the possibility of burning is reduced.
It can be further reduced.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a burner section furnace wall tube structure according to the present invention will be described below with reference to the drawings. FIG.
FIG. 2 is a horizontal sectional view of a boiler in which a round burner opening is provided at each of the four corners of the furnace wall, which is suitable for implementing the burner furnace wall tube structure of the present invention. FIG. 3 is a plan view of the cross section of the opening, showing the relationship between the opening of the corner, the furnace wall tube, and the rear furnace wall tube. FIG. 3 is a front view of the lowermost opening viewed from outside the furnace. FIG. 4 is a side view of a middle section and a bottom section of an opening section, showing a positional relationship between a furnace wall tube and a rear furnace wall tube in the vicinity of the opening. FIG.

As shown in the figure, four corners of a furnace wall 1 are provided with openings 3 of a round burner 2 and are vertically omitted in three stages in a vertical direction. The opening 3 is provided. In this round burner 2, the fuel 11 supplied to the inside of the furnace 4 from the end of the opening 3 burns and the flame 12 swirling in the furnace 4 forms the furnace wall 1.
The tip is advanced toward the inside of the furnace 4 to a position where it does not hit the furnace. Further, the furnace wall 1 other than the corner part and the furnace wall 1 at the corner part at a position away from the opening part 3 are arranged adjacently, and are made flat by a rear furnace wall tube 5 in which fins projecting from both sides are superposed. It is formed.

The furnace wall 1 around the corner where the opening 3 of the round burner 2 is provided is a furnace wall tube 6 arranged around the opening 3.
However, from the furnace wall 1 of the corner portion toward the opposite corner portion,
As shown in FIG. 4, it is bent so as to protrude toward the inside 4 of the furnace, and as shown in FIG. 3
Is provided to form a space. That is, the furnace wall tube 6 is bent toward the inside 4 of the furnace, and is bent in the left-right direction at the periphery of the opening 3.
The swirling flame 12 is generated in the furnace 4, and the opening 3 of the round burner 2 is provided so that the swirling flame 12 does not directly hit the furnace wall 1.

Therefore, on the peripheral edge of the opening 3, the furnace wall 1 projecting toward the inside of the furnace 4 and vertically and horizontally symmetrically, and also superimposed in the front-rear direction to form a three-dimensional arrangement, It will be formed in front of the corner. In this space, a refractory material 7 is provided so as to project toward the furnace interior 4 side. The refractory material 7 protruding toward the inside of the furnace 4 is arranged in a three-dimensional manner, supported by a furnace wall tube 6 forming the furnace wall 1, and inserted into the refractory material 7. It is fixed by the stud 8 and is cooled by these.

For this reason, the furnace wall tube 6 and the studs 8 for cooling the refractory material 7 are arranged so as to cool the refractory material 8 substantially uniformly, and support the opening 3. further,
The furnace wall tube 6 provided so as to project from the opening 3 toward the inside of the furnace 1 is disposed without projecting the furnace wall 1 around the opening 3 toward the furnace 1 side, and comes off from the opening 3. And is supported by a rear furnace wall tube 5 that forms a flat part of the furnace wall 1. The furnace wall tube 6 supported by the rear furnace wall tube 5 is supported by interposing a support metal 9 between the furnace wall tube 6 and the rear furnace wall tube 5.

The furnace wall tubes 6 arranged at the peripheral edge of the opening 3 are arranged so as to be expanded right and left in the upper and lower portions near the opening 3 as shown in FIG. In order to prevent burnout of the fins of the furnace wall tube 6, a refractory material 7 fixed by a large number of studs 8 is provided in the portion.

With the above structure, the burner furnace wall tube structure of the present embodiment is advanced to the furnace interior 1 so that the front end of the opening 3 of the round burner 2 is at the point A shown in FIG. The fuel 11 supplied to the inside of the furnace 4 from this opening 3 burns, and the flame 12 swirling in the furnace 4 becomes the furnace wall 1 downstream of the flame 12. Therefore, burning of the furnace wall 1 by the flame 12 can be reduced.

Further, as the tip of the opening 3 is advanced and disposed, the weight of the refractory material 7 forming the opening 3 that is advanced toward the furnace 4 side increases even if the weight of the refractory material 7 increases. The furnace 3 is effectively supported by the furnace wall tube 6 and the stud 8 buried inside the refractory material 7, so that the shape of the opening 3 is as designed even in a high temperature state. Shape can be maintained and burnout can be reduced.

Further, the refractory material 7 having a large weight can be used without additionally providing the furnace wall tube 6 which is increased in bending and length.
Can be sufficiently supported, the refractory material 7 can be sufficiently cooled, and the possibility of burnout can be further reduced. Further, even when the round burner 2 is installed so as to be arranged above and below the furnace 4 and to have a compact structure, the furnace wall tube 6 extends over the furnace 4. Since it is bent and arranged, the bend used for the bent part can be reduced,
As shown in FIG. 4, the bending radius required when returning the furnace wall tube 6 required between the upper round burner 2 and the lower round burner 2 is set to be large. And it is not necessary to use a bend having a small bending angle. For this reason, the pressure loss of the fluid flowing in the furnace wall tube 6 does not increase, and a reduction in the flow rate in the tube can be prevented.

A furnace wall tube 6 extending from the opening 3 toward the furnace interior 4 is supported by a rear furnace wall tube 5 installed behind the furnace wall tube 6 with a support metal 9 interposed therebetween. Therefore, the refractory material 7 supported and cooled by the furnace wall tube 6 and the rear furnace wall tube 5 is firmly held. Further, a thick refractory material 7 interposed between the furnace wall tube 6 and the rear furnace wall tube 5 to protect the fins of the furnace wall tube 6 and the rear furnace wall tube 5 has a stud 8 inserted therein. At the same time, the furnace wall tube 6 and the rear furnace wall tube 5 are firmly fixed to each other and further cooled by these, so that the possibility of burnout can be further reduced.

[0030]

As described above, the burner furnace wall tube structure of the present invention provides an opening for forming a burner in a corner of a furnace wall composed of a plurality of furnace wall tubes. Peripheral furnace wall pipes are bent and arranged so as to protrude inside the furnace from the furnace wall of the corner part toward the opposing corner part, and form a space for installing an opening, and furthermore, a burner is provided. And a supporting member for supporting a refractory material forming an opening provided so as to project from the opening toward the inside of the furnace.

This makes it possible to arrange the opening of the burner by advancing it to the inside of the furnace, and the fuel supplied into the furnace by this burner burns and the swirling flame hits the furnace wall on the downstream side of the flame. Therefore, the possibility of burning of the furnace wall by the flame can be reduced.

Further, even if the weight of the refractory material to be advanced to the inside of the furnace increases as the round burner advances to the inside of the furnace, it is supported by the furnace wall tube to be advanced to the inside of the furnace. As a result, the bending process increases, and it becomes possible to sufficiently support the furnace without adding a furnace wall tube having a longer length.Also, the refractory material can be sufficiently cooled, and the possibility of burnout can be reduced. It can be further reduced.

Further, they are arranged above and below the furnace, and
Even when a burner is installed with a compact boiler structure, the furnace wall tube is bent and arranged so as to protrude inside the furnace, so the bend used in the bent part is reduced. The bend radius required at the time of bending back between the upper round burner and the lower round burner can be large,
Further, since there is no need to use a bend having a small bending angle, the pressure loss of the fluid flowing through the furnace wall tube does not increase, and a reduction in the flow rate in the tube can be prevented.

Further, in the furnace wall tube structure of the present invention, the furnace wall tube provided so as to protrude from the opening toward the inside of the furnace is disposed without protruding toward the inside of the furnace at the furnace wall around the opening. It is configured to be supported by a rear furnace wall tube that forms a furnace wall behind the furnace wall tube around the opening.

Thus, the furnace wall tube, which extends from the opening toward the inside of the furnace, is firmly fixed to the rear furnace wall tube. In addition, the thick refractory material interposed between the furnace wall tube and the rear furnace wall tube to protect the fins of the furnace wall tube and the rear furnace wall tube, together with the studs inserted therein, together with the furnace wall tube. Since it is firmly fixed and cooled by the rear furnace wall tube, the possibility of burnout can be reduced.

[Brief description of the drawings]

FIG. 1 is a horizontal cross-sectional view of a boiler suitable for implementing a burner section furnace wall tube structure of the present invention, in which round burner openings are provided at four corners of a furnace wall;

FIG. 2 is a plan view of a cross section of an opening shown in FIG. 1, showing a relationship between an opening of a corner, a furnace wall tube, and a rear furnace wall tube;

FIG. 3 is a front view of a lowermost opening of the opening shown in FIG. 1, showing a relationship between the opening, a furnace wall tube, and a rear furnace wall tube;

FIG. 4 is a side view of the middle and lowermost openings of the opening shown in FIG. 1, showing a positional relationship between a furnace wall tube and a rear furnace wall tube near the opening;

FIG. 5 is a horizontal sectional view of a boiler in which an opening of a round burner is provided in a flat furnace wall,

FIG. 6 is a plan view of the opening shown in FIG. 5, showing the relationship between the opening of the corner, the furnace wall tube, and the rear furnace wall tube;

FIG. 7 is a plan view of the opening shown in FIG. 5, showing the relationship between the opening of the corner, the furnace wall tube, and the rear furnace wall tube;

8 is a side view of the middle and lowermost openings of the opening shown in FIG. 1, and is a view showing the arrangement relationship of a furnace wall tube and a rear furnace wall tube in the vicinity of the opening.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Furnace wall 2 Burner 3 Opening 4 Furnace 5 Rear furnace wall tube 6 Furnace wall tube 7 Refractory material 8 Stud 9 Support hardware 10 Burner part furnace wall tube structure 11 Fuel 12 Flame 01 Furnace wall 02 Rear wall 03 Front wall 04 Side wall 05 Burner 06 Opening 07 Furnace wall tube 08 Straight tubular furnace wall tube 09 Refractory 010 Burner unit furnace wall tube structure 011 Inside furnace 012 Fuel 012 Flame 014 Stud

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tadashi Nishimura 1-1-1, Wadazakicho, Hyogo-ku, Kobe-shi Inside the Kobe Shipyard, Sanishi Heavy Industries Co., Ltd. (72) Inventor Katsutoshi Kawano Wadazaki, Hyogo-ku, Kobe-shi Kobe Shipyard, Mitsui Heavy Industries Co., Ltd. (72) Inventor Kazuto Tsunoda 1-1-1 Wadamiya-dori, Hyogo-ku, Kobe-shi Nishiishi Engineering Co., Ltd. (72) Yoshiyoshi Inoue Kobe City Nishiishi Engineering Co., Ltd., 7-14, Wadamiya-dori 7-chome, Hyogo-ku

Claims (2)

[Claims] 1. A boiler furnace wall tube structure for a boiler, wherein the furnace wall tube is bent to form a burner opening in a furnace wall corner portion constituted by a plurality of furnace wall tubes. The furnace wall tube forming the furnace wall around the part is bent and arranged to form the opening that projects toward the inside of the furnace and is provided with an opening end for generating a circulation flow. A burner section furnace wall tube structure adapted to support the opening provided overhanging from the furnace wall. 2. The furnace wall tube, which is provided so as to swing out from the opening toward the inside of the furnace, is disposed around the opening without protruding toward the inside of the furnace, and is provided rearward of the furnace wall tube. The burner unit furnace wall tube structure according to claim 1, wherein the furnace wall tube structure is supported by a rear furnace wall tube forming a flat furnace wall.