JP4623558B2 - Boiler suspended heat transfer tube structure - Google Patents

Description

  The present invention relates to a heat transfer tube structure of a boiler, and in particular, a boiler heat transfer tube structure suitable for preventing contact wear of a wound tube which prevents tube row disturbance of a suspended heat transfer tube composed of a plurality of suspension tubes. About.

  FIG. 4 shows the overall layout and structure of the heat transfer tubes in the boiler furnace. The boiler furnace is composed of a furnace wall 15, a sub-side wall 16, a cage wall 17, a ceiling wall 8, etc., but there is a heat transfer tube wall called a water wall pipe that constitutes a wall surface such as the furnace wall 15 or the sub-side wall 16, Further, a suspended heat transfer tube 7 and the like are arranged in the boiler furnace.

  The space partitioned by the furnace wall 15, the sub-side wall 16, the cage wall 17, and the ceiling wall 8 is called a heating part because high-temperature combustion gas flows during boiler operation, and is a penthouse casing 18 above the ceiling wall 8. The partitioned space is called a non-heated part. The furnace wall 15 and the like are all supported by a boiler steel frame 20 installed on the ground surface 21 via a sling bolt 19, and can be thermally expanded downward when the temperature becomes high during boiler operation.

  Next, the structure of the suspended heat transfer tube 7 will be described with reference to FIG. The suspended heat transfer tube 7 includes an inlet manifold 1, a plurality of inlet headers 2, an outlet manifold 6, a plurality of outlet headers 5, a plurality of inlet-side suspended heat transfer tubes 3, and a plurality of them. It is comprised with the suspended heat exchanger tube 4 of the exit side.

Further, hanging heat exchanger tube 4 a plurality of the inlet side of the hanging heat transfer tube 3 and the outlet side are all configured in the same plane, heat balance, the front and rear direction of the furnace for the metal temperature reduction of the heat transfer tube 2 They are divided into two parts. The plurality of suspended heat transfer tubes 3 and 4 are arranged at the same pitch, and in order to align the tube group, the outermost tube of each stage intersects the suspended heat transfer tube and is sandwiched from the left and right. The wound tubes 9a-10a, 9b-10b, 9c-10c, 11a-12a, 11b-12b, 11c-12c are arranged. Further, with the increase in the size of the boiler, the wound tube is arranged in about three stages in the height direction of the suspended heat transfer tubes 3 and 4.

  Further, the suspended heat transfer tube 7 shown in FIG. 5 passes through the suspended heat transfer tube 14a and the suspended heat transfer tube 14d from the inlet header 2, respectively, and then exits from the suspended heat transfer tube 14b and the suspended heat transfer tube 14c, respectively. The gather 5 also has a configuration in which fluid flows.

  The suspended heat transfer tubes 14a and 14b are arranged in parallel in the direction perpendicular to the paper surface at the position of point X in the drawing, and are folded upward at the lowermost end of the heat transfer tube 7 so as not to be illustrated on the back side of the paper surface. Are arranged in parallel in the direction perpendicular to the paper surface at the same surface position, and then the parallel arrangement is released at the position on the back side of the paper surface corresponding to the point X, and connected to the suspended heat transfer tubes 14b and 14a, respectively, not shown. Yes.

  The suspended heat transfer tubes 14c and 14d are also arranged in parallel in the direction perpendicular to the paper surface at the position of the Y point, folded back upward at the lowermost end portion of the heat transfer tube 7, and similarly at the surface position of the heat transfer tube 7 (not shown) on the back side of the paper surface. After being arranged in parallel in the direction perpendicular to the paper surface, the parallel arrangement is released at a position on the back side of the paper surface corresponding to the Y point, and connected to the suspended heat transfer tubes 14d and 14c, respectively, not shown.

  The location where the suspended heat transfer tubes 14a to 14d are folded upward in a direction perpendicular to the paper surface is at a lower position apart from the lowermost end of the heat transfer tube 7 by a predetermined distance in consideration of expansion of the heat transfer tube 7. Is.

  Moreover, as shown in FIG. 6, the structure which attached the protector 13 so that the winding tube of the adjacent side of the two suspended heat exchanger tubes 3 and 4 might not contact directly was utilized.

In addition, FIG. 7 (FIG. 7 (a) is a side view of the main part of a suspended heat transfer tube, and FIG. 7 (b) is a diagram of the microfilm of Japanese Patent Application No. 60-37517 (Japanese Utility Model Application No. 61-154403). FIG. 7 (a) is a cross-sectional view taken along the lines DD, EE, and FF of FIG. 7A, FIG. 7C is a detailed view of a portion of FIG. 7A, and FIG. As shown in FIG. 7 (c), the movement of the adjacent tubes 27 of the suspended heat transfer tubes is restricted by the L-shaped mounting bracket 25 and the stopper 28, and the screen tube A configuration is disclosed in which a portion of the tube 27 closest to 22 is bent to the screen tube 22 side and the screen tube 22 and the tube 27 side are locked by a support fitting 26.
A microfilm of actual application No. 60-37517 (No. 61-154403) (FIG. 1)

     In the prior art shown in FIG. 5, since the suspended heat transfer tubes 3 and 4 are sandwiched between the winding tubes 9a-10a to 11c-12c, the disturbance of the tube group can be prevented, but it is arranged in the front-rear direction of the boiler furnace. The suspended heat transfer tubes 3 and 4 may sway like a pendulum, and depending on the operating state, the swaying in the front-rear direction is not in the same direction and may sway randomly. In this case, the winding tubes 10a and 12a, the winding tubes 10b and 12b, or the winding tubes 10c and 12c on the adjacent side of the two suspended heat transfer tubes 3 and 4 are in contact with each other. This contact fluctuates due to the eccentricity of the center of gravity of the suspended heat transfer tubes 3 and 4 due to the gas flow during boiler operation, the use of a soot blower that blows off the ash adhering to the heat transfer tube surface with steam or the attachment of a clinker, etc. For this reason, the heat transfer tubes are thinned by repeating contact between the wound tubes 10a and 12a, the wound tubes 10b and 12b, or the wound tubes 10c and 12c.

  The wear due to the contact between the wound tubes 10a, 12a, the wound tubes 10b, 12b or the wound tubes 10c, 12c increases at an accelerated rate with time. This is a phenomenon that occurs due to an increase in the contact force of the tube due to the oscillation because the oscillation distance of the tube increases due to wear of the heat transfer tube.

  6 (FIG. 6A is an enlarged view of the winding tubes 10a and 12a of the heat transfer tube 4 in FIG. 5, and FIG. 6B is a view taken along the line A-A in FIG. 6A. In the configuration in which the protector 13 is attached to the winding tube so that the inner winding tubes 10a and 12a do not directly contact each other, it is inevitable that the protector 13 is worn and damaged over time, and the wear-damaged protector 13 is handled as a consumable item. However, replacement work etc. occurred frequently and maintenance was not good.

  Further, as shown in FIG. 7, the method of using the L-shaped mounting bracket 26 between adjacent tubes 27 of the suspended heat transfer tube is also not easy to maintain due to the replacement work of the mounting bracket 26 that is worn and damaged. .

An object of the present invention, the eliminating the drawbacks of the prior art, hanging heat exchanger tube structure wound tube before-rear direction in the divided arranged hanging heat exchanger tube does not cause a contact wear be swung in the boiler furnace Is to provide.

The above object of the present invention is achieved by the following means.
According to the first aspect of the present invention, two suspended heat transfer tubes of a boiler constructed by bending a plurality of tubes into a U-shape and suspending the tubes in the same plane are connected in the longitudinal direction of the furnace. In the suspended heat transfer tube structure, the two outermost tubes (9a, 10a, 12a) of the suspended heat transfer tubes of the two suspended heat transfer tubes are adjacent to each other. The first tube (10a) at the outermost periphery of one suspended heat transfer tube on the side is shifted to the second tube (10a ') side, which is one inner side from it, and the first tube (10a) and the second tube tube (10a ') in a state in parallel arranged in the longitudinal direction of the furnace, another outermost tube (9a, 9a of the one hanging heat transfer tube') together with its more inner hanging heat transfer tubes tube winding connected sandwiched so as to cross the group And cube, a hanging heat exchanger tube structures of the boiler to ensure the interval of a degree that adjacent portions of each other swinging of the two hanging heat transfer tubes are not in contact.

The invention according to claim 2 is the suspended heat transfer tube structure for a boiler according to claim 1, wherein the interval between the two suspended heat transfer tubes is set to be twice or more the diameter of the wound tube .

(Function)
Conventionally, even when the suspended heat transfer tubes including the wound tube are arranged in two in the longitudinal direction of the furnace, the tube row pitch is all the same, and the suspended heat transfer tubes are arranged in two in the longitudinal direction of the furnace. When the heat transfer tubes are randomly swung, the adjacent wound tubes of the two suspended heat transfer tubes are in contact with each other. However, according to the invention of claim 1, the two suspended heat transfer tubes By arranging the winding tubes on the adjacent sides of the tube so that the outermost tube is shifted to the suspended heat transfer tube side that is one inner side of it, there is no contact even if the tubes of the two suspended heat transfer tubes are swung. A certain degree of interval can be secured.

In the invention according to claim 2, since the interval between the two suspended heat transfer tubes is set to be twice or more the diameter of the wound tube, it is possible to secure the interval between the two suspended heat transfer tubes so that they do not come into contact with each other due to the oscillation of the tube. it can.

According to invention of Claims 1-2, by enlarging the arrangement pitch of the winding tube arrange | positioned at the mutually adjacent side of the two suspended heat exchanger tubes arrange | positioned in the front-back direction of a furnace, between tubes Since there is no contact, contact friction does not occur.

Embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a side view of the suspended heat transfer tube in the boiler of the present embodiment, and FIG. 2 (a) shows both the wound tubes 9a on the outermost periphery of the suspended heat transfer tube 3 or the heat transfer tube 4 in FIG. Taking 10a as an example, an enlarged view of a portion where the wound tube 9a-10a is sandwiched so as to intersect with another suspended heat transfer tube and a tube 12a portion of the wound tube 12a-11a are shown, and FIG. FIG. 2A shows an arrow view from the direction of arrow A in FIG. 2A, FIG. 2C shows an arrow view from the direction of arrow B in FIG. 2A, and FIG. The CC sectional view taken on the line is shown.

  As shown in FIG. 1, the suspended heat transfer tube in the boiler has an inlet side suspended heat transfer tube 3 suspended from an inlet manifold 1 and an inlet header 2, and an outlet side suspended heat transfer to an outlet manifold 6 and an outlet header 5. The heat pipe 4 is suspended. The inlet manifold 1, the inlet header 2, the outlet header 5, and the outlet manifold 6 are arranged on the upper side of the ceiling wall 8. The inlet-side suspended heat transfer tube 3 and the outlet-side suspended heat transfer tube 4 are illustrated in FIG. A suspended heat transfer tube 7 shown in FIG.

  The suspended heat transfer tube 3 on the inlet side and the suspended heat transfer tube 4 on the outlet side are an upper wound tube and an intermediate wound tube (inlet) in which an upper wound tube (inlet) 9a and an upper wound tube (outlet) 10a are connected together. 9b and a middle winding tube (outlet) 10b connected together and a middle winding tube and a lower winding tube (inlet) 9c and a lower winding tube (outlet) 10c and a lower winding tube connected together Upper winding tube in which winding tube (inlet) 11a and upper winding tube (outlet) 12a are connected together, and middle winding tube in which middle winding tube (inlet) 11b and middle winding tube (outlet) 12b are connected together The lower winding tube (inlet) 11c and the lower winding tube (outlet) 12c are connected together.

  The suspended heat transfer tubes 14a and 14b are arranged in parallel in the direction perpendicular to the paper surface at the position of point X in the drawing, and are folded upward at the lowermost end of the heat transfer tube 7 so as not to be illustrated on the back side of the paper surface. Are arranged in parallel in the direction perpendicular to the paper surface at the same surface position, and then the parallel arrangement is released at the position on the back side of the paper surface corresponding to the point X, and connected to the suspended heat transfer tubes 14b and 14a, respectively, not shown. Yes.

As shown in FIG. 1, Te hanging heat exchanger tube 7 odor composed of a plurality of tubes, so as to intersect the lower heat transfer tubes 3 and 4 hanging respective gas inlet side and the outlet side along the longitudinal direction of the furnace In addition, the lower ends of the two outermost heat transfer tubes 9a, 9a ′; 10a, 10a ′ of the heat transfer tubes 3, 4 are bent out of the plane (FIGS. 2B and 2C). See), forming the wound tube 9a-10a. At this time, as shown in FIG. 2 (d), the outermost tube 10a is shifted in pitch by one suspension tube and arranged in parallel with the inner tube 10a ′ in the longitudinal direction of the furnace. A space equivalent to one heat transfer tube is made adjacent to the heat transfer tubes 3 and 4 located in the center in the front-rear direction. If there is a space for one heat transfer tube, the tubes do not come into contact with each other even if the suspended heat transfer tubes 3 and 4 in the longitudinal direction of the furnace are swung.

  The embodiment shown in FIG. 1 is an example in which the tube row pitch of the wound tubes 10 a and 12 a is changed from the lower part of the ceiling wall 8. The position where the tube row pitch is changed is not necessarily the lower part of the ceiling wall 8.

  FIG. 3 shows a side view of a suspended heat transfer tube of another embodiment, but shows an example in which the tube row pitch of the wound tubes 10a and 12a is changed from the lower portion of the outlet header 5. FIG. FIG. 3 is an example in which the arrangement pitch of the winding tubes 10a and 12a from the joint portion of the outlet header 5 is made twice or more larger than that of the outlet header 5 of FIG. Also in this case, since a sufficient space is formed between the heat transfer tubes 3 and 4, even if the suspended heat transfer tubes 3 and 4 in the front-rear direction of the furnace swing, the tubes do not come into contact with each other.

  According to the present invention, even if the suspended heat transfer tubes in the longitudinal direction of the furnace swing, the tubes do not come into contact with each other.

The side view of the suspended heat exchanger tube in the boiler of the Example of this invention is shown. FIG. 2 (a) shows an enlarged view of a portion where both the wound tubes on the outermost periphery of the suspended heat transfer tube of FIG. 1 are sandwiched so as to intersect with other suspended heat transfer tubes, and FIG. 2 (b). FIG. 2 (a) shows an arrow view from the direction of arrow A, FIG. 2 (c) shows an arrow view from the direction of arrow B in FIG. 2 (a), and FIG. The CC line cross-section arrow line view of (a) is shown. The side view of the suspended heat exchanger tube in the boiler of the other Example of this invention is shown. The side sectional view of a boiler body is shown. The side view of the hanging heat exchanger tube of a prior art is shown. FIG. 6A shows a partial side view of a conventional suspended heat transfer tube, and FIG. 6B shows an AA arrow view of FIG. 6A. FIG. 7A is a side view of the main part of the suspended heat transfer tube, and FIG. 7B is a cross-sectional view taken along lines DD, EE, and FF in FIG. FIG. 7C is a detailed view of a portion of FIG. 7A, and FIG. 7D is a view taken along line GG of FIG. 7C.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Inlet manifold 2 Inlet header 3 Inlet side suspension pipe 4 Outlet side suspension tube 5 Outlet header 6 Outlet manifold 7 Suspension heat transfer tube 8 Ceiling wall 9a Upper winding tube (inlet) 10a Upper winding tube (outlet)
9b Middle winding tube (inlet) 10b Middle winding tube (outlet)
9c Lower winding tube (inlet) 10c Lower winding tube (outlet)
11a Upper winding tube (inlet) 12a Upper winding tube (outlet)
11b Middle winding tube (inlet) 12b Middle winding tube (outlet)
11c Lower winding tube (inlet) 12c Lower winding tube (outlet)
13 Protector 14a-14d Suspended heat transfer tube 15 Furnace wall 16 Sub-side wall 17 Cage wall 18 Penthouse casing 19 Sling bolt 20 Boiler steel frame 21 Surface 22 Screen tube 25 Mounting bracket 26 Support bracket 27 Tube 28 Stopper

Claims (2)

A suspended heat transfer tube in which two suspended heat transfer tubes of a boiler configured by bending a plurality of tubes in a U-shape and suspending them in a header are connected in the longitudinal direction of the furnace. In structure
Out of the outermost tubes (9a, 10a, 12a) of the suspended heat transfer tubes of the two suspended heat transfer tubes, the outermost periphery of one suspended heat transfer tube on the adjacent side of the two suspended heat transfer tubes The first tube (10a) is shifted to the second tube (10a ′) side, which is one inner side of the first tube (10a), and the first tube (10a) and the second tube (10a ′) are moved in the longitudinal direction of the furnace. With the parallel arrangement,
Another outermost tube (9a, 9a ') of the one hanging heat transfer tubes with, and sandwiched by winding and connecting tubes so as to intersect it from the tube group of inner hanging heat transfer tube,
A suspended heat transfer tube structure for a boiler, wherein an interval is secured such that adjacent portions do not come into contact with each other by swinging the two suspended heat transfer tubes. The suspended heat transfer tube structure for a boiler according to claim 1, wherein the interval between the two suspended heat transfer tubes is set to be twice or more the diameter of the wound tube .

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