JP2014115047A - Slide foundation structure of waste heat collecting boiler support device and its construction method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem in which: a slide plate of ceiling backstays partially contacts a base plate.SOLUTION: This slide foundation structure 15 for slidably supporting a gate-type bridge 5, to a foundation, having ceiling backstays and side-face backstays 4 and supporting a boiler by hanging it with the ceiling backstays has: a slide plate 16 arranged at lower ends of the side-face backstays 4; a support space 18 formed at the foundation 8 corresponding to the slide plate 16; a support structural body 21 which has the base plate 19 having a slide face 19a larger in area than a slide face 16a of the slide plate 16 and a plurality of reinforcing plates 20 fixed to a lower face of the base plate 19, and is arranged in the support space 18; a wedge mechanism 27 which is arranged between a lower face of the support structural body 21 and a bottom face of the support space 18, and can adjust an inclination of the support structural body 21; and a concrete-solidified body 29 which is formed by pouring concrete between the interior of the support space 18 and the reinforcing plate 20 of the support structural body 21.

Description

  The present invention relates to a slide foundation structure of an exhaust heat recovery boiler support device and a construction method thereof.

  The combined cycle power plant generates power with a gas turbine and directs exhaust gas discharged from the gas turbine to a heat recovery steam generator (HRSG) to recover heat in the exhaust gas to generate steam, Steam turbines also generate electricity. In general, a combined cycle power plant has an advantage that in addition to high power generation efficiency, load responsiveness is high and it can cope with a rapid increase in power demand.

  Examples of the exhaust heat recovery boiler include a horizontal exhaust heat recovery boiler that guides exhaust gas in a lateral direction (see Patent Documents 1 and 2, etc.). In such a horizontal exhaust heat recovery boiler, the boiler extending in the lateral direction is supported by being suspended by a support device composed of a plurality of portal frames arranged at a predetermined interval in the longitudinal direction of the boiler. doing.

  A conventionally used portal frame includes a ceiling backstay for supporting a suspended weight of a boiler composed of a boiler casing and a heat transfer tube group disposed in the boiler casing, and both ends of the ceiling backstay. It has a ramen structure consisting of left and right side back stays that are placed at the bottom and transmit the load acting on the ceiling back stay to the foundation. Holds the strength to withstand.

JP 09-303707 A JP 2003-222304 A

  As shown in FIG. 5, the conventional support structure for the exhaust heat recovery boiler is arranged in the upper part of the boiler casing 2 so as to extend in the width direction (left-right direction in FIG. 5) of the boiler casing 2 constituting the boiler 1. A ceiling-type frame 5 having a ceiling back stay 3 and side-side back stays 4 that stand upright outside the left and right sides in the width direction of the boiler casing 2 and support both ends of the ceiling back stay 3 are installed. A plurality of the gate-type frames 5 are arranged with a predetermined interval in the longitudinal direction of the boiler 1 (direction perpendicular to the paper surface of FIG. 5). In FIG. 5, reference numeral 6 denotes a lower backstay that connects the left and right side backstays 4 to each other on the lower side of the boiler casing 2.

  The lower end of the side back stay 4 of the portal frame 5 provided at the longitudinal center position of the boiler 1 is fixed to the foundation, while the side back stay 4 of the portal frame 5 provided at a position other than the longitudinal center position. The lower end is supported so as to be slidable with respect to the base 8 via a slide base structure 7 shown in FIG. Since the boiler 1 thermally expands and contracts in the longitudinal direction due to changes in the internal gas temperature, the lower end of the side back stay 4 slides in the longitudinal direction of the boiler via the slide base structure 7, thereby thermally expanding and contracting the boiler 1. Is allowed.

  The slide foundation structure 7 is fixed to the foundation 8 horizontally, and the upper surface of the base plate 9 made of, for example, a fluororesin (Teflon: registered trademark), which is a material having a low friction coefficient, is formed on the side backstay 4. A sliding plate 10 provided at the lower end slides.

  The weight of the boiler 1 including the boiler casing 2 and the heat transfer tube group 11 provided in the boiler casing 2 is supported by being suspended from the ceiling backstay 3 via a suspension material (not shown). For this reason, a bending moment proportional to the square of the span acts on the ceiling back stay 3, and the ceiling back stay 3 is deformed so that the intermediate portion protrudes downward as shown by a broken line in FIG. At this time, since the ceiling back stay 3 and the side back stay 4 are rigid bodies having a ramen structure welded in a gate shape, the side back stay 4 is indicated by a broken line due to the bending deformation of the ceiling back stay 3. A secondary bending moment is generated in which the intermediate portion protrudes outward. This secondary bending moment is generated by constraining the mutual distance between the lower ends of the side backstays 4. In particular, when the height interval between the lower back stay 6 connecting the lower side of the side back stay 4 and the upper surface of the foundation 8 is large, the upper and lower intermediate portions of the portal frame 5 bulge outward. It transforms into a barrel shape.

  When the gate-type frame 5 is deformed into a barrel shape, the lower end of the side back stay 4 is inclined to the inside of the gate shape. For this reason, the sliding plate 10 provided at the lower end of the side back stay 4 is inclined, The base plate 9 provided at 8 is one-sided.

  When the sliding plate 10 comes into contact with the base plate 9, the extreme surface pressure on the sliding surface increases, and the sliding plate 10 cannot slide stably on the base plate 9. Dust, sand, or the like enters the gap formed between the base plate 9 and it becomes more difficult to slide. For this reason, it becomes difficult to slide the portal frame 5 corresponding to the thermal expansion and contraction of the boiler 1, and the boiler 1 may be stressed.

  The present invention has been made in view of the above-described conventional problems. When the sliding plate at the lower end of the side backstay is inclined with respect to the base plate due to the deformation of the ceiling backstay and the side backstay after the boiler is installed, The slide base structure of the exhaust heat recovery boiler support device, in which the inclination of the base plate can be adjusted to match the inclination of the plate, and the portal frame can be stably slid by sliding on the surface of the sliding plate and the base plate, and It is intended to provide a construction method.

The present invention includes a ceiling back stay and side back stays that support both ends of the ceiling back stay at a plurality of longitudinal positions of a horizontal exhaust heat recovery boiler that guides gas in the lateral direction, and the boiler by the ceiling back stay. A gate frame that suspends and supports the weight of the gate frame is disposed, and the lower end of the side back stay of the gate frame is supported to be slidable on the foundation so as to allow thermal expansion and contraction in the longitudinal direction of the boiler. A slide basic structure of the exhaust heat recovery boiler support device,
A sliding plate having a sliding surface orthogonal to the side backstay at the lower end of the side backstay;
A concrete support space formed by being recessed in the foundation corresponding to the sliding plate,
A base plate that has a sliding surface having an area larger than the sliding surface of the sliding plate on the upper side to support the sliding plate, and extends on a lower surface of the base plate in a width direction and a lower direction perpendicular to the longitudinal direction of the boiler; A support structure having a plurality of reinforcing plates fixed at intervals in the longitudinal direction of the boiler and disposed in the support space;
A wedge mechanism that is arranged between the lower surface of the support structure and the bottom surface of the support space and can adjust the inclination of the support structure;
A boiler is mounted on the ceiling back stay of the portal frame in which the wedge mechanism and the support structure are disposed inside the support space, and the sliding plate of the side back stay is placed on the reinforcing plate of the support structure. In the state where the inclination of the support structure is adjusted by the wedge mechanism so that the inclination of the base plate coincides with the sliding plate inclined by the side back stay being bent by hanging the side back stay, the support space and the A concrete solidified body formed by placing concrete between the reinforcing plates of the support structure;
The present invention relates to a slide basic structure of an exhaust heat recovery boiler support device, characterized in that

  In the slide basic structure of the exhaust heat recovery boiler support device, a stopper that restricts the sliding plate from moving in the width direction at the end portion in the width direction orthogonal to the longitudinal direction of the boiler on the sliding surface on the upper side of the base plate Is preferably provided.

  In the slide foundation structure of the exhaust heat recovery boiler support device, it is preferable that a lower surface of the base plate has a shear key that extends in a longitudinal direction of the boiler and protrudes downward from the reinforcing plate.

  Moreover, in the slide foundation structure of the exhaust heat recovery boiler support device, it is preferable that the bottom portion of the support space provided in the foundation has a recess that can accommodate the share key.

The present invention includes a ceiling back stay and side back stays that support both ends of the ceiling back stay at a plurality of longitudinal positions of a horizontal exhaust heat recovery boiler that guides gas in the lateral direction, and the boiler by the ceiling back stay. A gate frame that suspends and supports the weight of the gate frame is disposed, and the lower end of the side back stay of the gate frame is supported to be slidable on the foundation so as to allow thermal expansion and contraction in the longitudinal direction of the boiler. A method for constructing a slide foundation structure for an exhaust heat recovery boiler support device,
A wedge mechanism is placed in the support space provided on the foundation,
A support structure having a reinforcing plate on the lower surface of the base plate is placed on the wedge mechanism.
On the base plate of the support structure, the gate frame is installed by placing a sliding plate provided at the lower end of the side back stay of the gate frame.
Suspend and support the boiler on the ceiling backstay of the portal frame,
Adjusting the inclination of the support structure by operating the wedge mechanism so that the sliding surface of the base plate matches the sliding surface of the sliding plate;
Subsequently, the construction method of the slide foundation structure of the exhaust heat recovery boiler support device, wherein concrete is placed between the inside of the support space and between the reinforcing plates of the support structure to form a solidified solid body, It is related to.

  According to the present invention, when the sliding plate at the lower end of the side back stay of the gate-type frame is tilted with respect to the base plate, the base plate is adjusted to adjust the inclination of the sliding plate so as to match the inclination of the sliding plate. The problem that the lower surface of the sliding plate and the upper surface of the base plate come into contact with each other can be solved, and the portal frame can be stably slid by sliding the surface of the sliding plate and the base plate.

(A) is a perspective view which shows an example of the slide basic structure of the waste heat recovery boiler support apparatus of this invention, (b) is the side view which looked at (a) from I direction. (A) is the front view which looked at Fig.1 (a) from the II direction, (b) is a front view which shows the action | operation of (a). It is a front view which shows an example of the construction method of the slide foundation structure in this invention. It is a side view showing an example of an exhaust heat recovery boiler to which the present invention is applied. It is a front view for demonstrating the problem of the conventional waste heat recovery boiler provided with the portal frame of the ramen structure.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 4 shows an example of an exhaust heat recovery boiler to which the present invention is applied, and the same reference numerals as those in FIG. 5 denote the same parts. The boiler casing 2 comprises a horizontal boiler 1 having a gas inlet A and a gas outlet B so as to guide the gas in the lateral direction. A ceiling back stay 3 extending in the width direction of the boiler casing 2 is provided on the upper portion of the boiler casing 2, and a side back that supports both ends of the ceiling back stay 3 is provided outside the side surface in the width direction of the boiler casing 2. A gate-type frame 5 is configured by standing the stay 4. And the support apparatus of the boiler 1 is comprised by arrange | positioning the said portal frame 5 in multiple with the required space | interval in the longitudinal direction (left-right direction of FIG. 4) of the boiler casing 2. As shown in FIG.

  Inside the boiler casing 2, for example, a heat transfer tube group 11 including a burner 12 and heat transfer panels 11 a, 11 b, 11 c, 11 d, and 11 e is provided from the upstream side in the flow direction of the gas introduced from the gas inlet A. In addition, a steam / water separation header 13 connected to the heat transfer tube group 11 is provided on the upper portion of the boiler casing 2.

  The weight of the boiler 1 including the boiler casing 2, the heat transfer tube group 11 provided in the boiler casing 2, and the steam-water separation header 13 provided in the upper part of the boiler casing 2 is suspended via a suspension material (not shown). The portal frame 5 is suspended and supported by the ceiling backstay 3.

  In FIG. 4, the lower end of the side back stay 4 of the portal frame 5 provided at the center position in the longitudinal direction of the boiler 1 is fixed to the foundation 8 by a fixing portion 14. The lower end of the side backstay 4 of the gate-type frame 5 is supported so as to be slidable with respect to the foundation 8 via the slide foundation structure 15 of the present invention.

  As shown in FIGS. 1 (a), 1 (b), 2 (a), 2 (b), and 3 as an example, the slide basic structure 15 has a lower sliding surface 16a at the lower end of the side back stay 4. A rectangular sliding plate 16 orthogonal to the side back stay 4 is fixed, and the sliding plate 16 is reinforced by a rib plate 17 provided on the side back stay 4.

  At a position corresponding to the sliding plate 16 provided on the side back stay 4 of the gate-type frame 5 in the foundation 8, a concrete support space 18 that is recessed with a larger opening area than the sliding plate 16 is provided. Is formed.

  In the figure, reference numeral 21 denotes a support structure that supports the sliding plate 16, and the supporting structure 21 includes a base plate 19 having a sliding surface 19 a having an area larger than the sliding surface 16 a of the sliding plate 16 on the upper side, A plurality of reinforcing plates 20 are provided on the lower surface of the base plate 19 so as to extend in the width direction and downward, and are fixed to the longitudinal direction of the boiler 1 at intervals. At least one of the sliding surfaces 16a and 19a is preferably processed with a material having a low friction coefficient, for example, a fluororesin (Teflon: registered trademark).

  A plate-like stopper 22 for restricting movement of the sliding plate 16 in the width direction by fitting the sliding plate 16 to a width direction end portion of the sliding surface 19a of the base plate 19 constituting the support structure 21; 22 'is provided. Further, ribs 23 are fixed at positions corresponding to the reinforcing plate 20 on the outer side in the width direction of the plate-like stoppers 22 and 22 ′ to reinforce the stoppers 22 and 22 ′. Further, a reinforcing plate 24 is provided on the lower side of the end face in the width direction of the reinforcing plate 20 to fix and reinforce the end face portions of the reinforcing plate 20 to each other. An opening 25 is formed between the upper edge of the reinforcing plate 24 and the lower surface of the base plate 19 to communicate between the reinforcing plates 20 and the outside.

  A shear key 26 that extends in the longitudinal direction of the boiler 1 and projects downward from the reinforcing plate 20 is provided on the lower surface of the base plate 19 of the support structure 21. The shear key 26 extends in the longitudinal direction so as to connect the end plate 26a having a predetermined width fixed to the base plate 19 and the reinforcing plate 20 and the front and rear end plates 26a at the longitudinal front and rear ends of the support structure 21. The base plate 19 and a connecting plate 26b fixed to each reinforcing plate 20 are formed.

  Further, a wedge mechanism 27 is provided between the lower surface 20a of the reinforcing plate 20 of the support structure 21 and the bottom surface 18a of the support space 18 so as to adjust the inclination of the support structure 21. .

  In the support space 18, when the wedge mechanism 27 is disposed on the bottom surface 18 a of the support space 18, and the support structure 21 is disposed on the upper portion of the wedge mechanism 27, the sliding surface 19 a of the base plate 19 is the base 8. It is formed with a depth slightly protruding from the surface 8a. A groove recess 28 for accommodating the shear key 26 with a margin is formed on the bottom surface 18 a of the support space 18.

  Below, the construction method of the slide foundation structure 15 of the said exhaust heat recovery boiler support apparatus is demonstrated.

  As shown in FIG. 3, the bottom surface 18a of the support space 18 provided in the foundation 8 is required to correspond to the width direction with the recess 28 interposed therebetween, and in the longitudinal direction as shown in FIG. 1 (b). The wedge mechanism 27 is arranged at a position spaced apart.

  Subsequently, the lower surface 20 a of the reinforcing plate 20 of the support structure 21 is brought into contact with the wedge mechanism 27 and placed. At this time, the wedge mechanism 27 is configured such that the height of the wedge mechanism 27 is increased by driving the outer end of the wedge 27a inward.

  Subsequently, the sliding surface 16a of the sliding plate 16 provided at the lower end of the side back stay 4 of the portal frame 5 is brought into contact with the stoppers 22 and 22 'on the sliding surface 19a of the base plate 19 of the support structure 21. The portal frame 5 is installed in such a manner.

  Next, as shown in FIG. 4, the boiler 1 is suspended and installed on the ceiling backstay 3 of the portal frame 5.

  When the weight of the boiler 1 acts on the ceiling back stay 3, the ceiling back stay 3 is deformed by a bending moment proportional to the square of the span so that the intermediate portion protrudes downward as shown by a broken line in FIG. Produce. Further, since the ceiling back stay 3 and the side back stay 4 are rigid bodies having a ramen structure welded in a gate shape, the side back stay 4 is indicated by a broken line due to the curvature of the ceiling back stay 3. A secondary bending moment is generated in which the intermediate portion projects outward, and the portal frame 5 is deformed into a barrel shape. When the portal frame 5 is deformed into a barrel shape, the lower end of the side back stay 4 is inclined to the inside of the portal shape. Therefore, as shown in FIG. 2A, the sliding plate provided at the lower end of the side back stay 4 16 inclines up and down in the width direction, the sliding plate 16 comes into contact with the sliding surface 19a of the base plate 19, and the inner side in the width direction (boiler) between the sliding surface 16a of the sliding plate 16 and the sliding surface 19a of the base plate 19 A gap S that is inclined toward the first side is generated.

  For this reason, the inclination of the support structure 21 is adjusted by applying a force P to the wedge 27a of the wedge mechanism 27 on the side where the gap S is generated (the right side of FIG. 2A), and FIG. ), The sliding surface 19 a of the base plate 19 of the support structure 21 coincides with the sliding surface 16 a of the sliding plate 16.

  Subsequently, as shown in FIG. 2B, concrete is cast between the inside of the support space 18 and between the reinforcing plates 20 of the support structure 21 to form a concrete solidified body 29. At this time, since the opening 25 is formed between the upper side of the reinforcing plate 24 provided at the end of the reinforcing plate 20 and the lower surface of the base plate 19, the concrete is also formed between the reinforcing plates 20 and the recess 28. The concrete solidified body 29 can be formed by easily placing.

  As described above, the support structure 21 is placed on the wedge mechanism 27 disposed on the bottom surface 18 a of the support space 18 provided in the foundation 8, and the portal frame 5 is placed on the base plate 19 of the support structure 21. The gate frame 5 is installed by placing a sliding plate 16 provided at the lower end of the side back stay 4, and the boiler 1 is suspended from the ceiling back stay 3 of the gate frame 5. Then, the gate frame 5 connected by the lower back stay 6 is deformed into a barrel shape, and the sliding plate 16 at the lower end of the side back stay 4 is inclined with respect to the base plate 19.

  Thus, after the sliding plate 16 is tilted by installing the boiler 1 on the portal frame 5, the tilt of the base plate 19 of the support structure 21 is adjusted so as to match the tilt of the sliding plate 16. Thereafter, concrete is cast into the support space 18 to form the solidified solid body 29, so that the problem that the sliding surface 16a of the sliding plate 16 and the sliding surface 19a of the base plate 19 come into contact with each other is solved. Since the plate 16 and the base plate 19 are slid according to the surface, the gate frame 5 can be stably slid.

  Further, the load acting in the width direction from the side backstay 4 via the sliding plate 16 to the slide foundation structure 15 is firmly supported by the stoppers 22 and 22 ′ and the shear key 26.

  The slide basic structure of the exhaust heat recovery boiler support device of the present invention and the construction method thereof are not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention. Of course.

DESCRIPTION OF SYMBOLS 1 Boiler 3 Ceiling back stay 4 Side back stay 5 Gate frame 6 Lower back stay 8 Base 15 Slide foundation structure 16 Sliding plate 16a Sliding surface 18 Support space 18a Bottom surface 19 Base plate 19a Sliding surface 20 Reinforcement plate 20a Lower surface 21 Support structure 22, 22 'stopper 26 shear key 27 wedge mechanism 29 solidified concrete

Claims (5)

A horizontal exhaust heat recovery boiler that guides gas in the lateral direction has a ceiling back stay and side back stays that support both ends of the ceiling back stay at a plurality of locations in the longitudinal direction, and the weight of the boiler is suspended by the ceiling back stay. An exhaust heat recovery boiler in which a gate-type frame that is supported by being lowered is arranged, and a lower end of the side back stay of the gate-type frame is slidably supported on the foundation so as to allow thermal expansion and contraction in the longitudinal direction of the boiler A slide base structure of the support device,
A sliding plate having a sliding surface orthogonal to the side backstay at the lower end of the side backstay;
A concrete support space formed by being recessed in the foundation corresponding to the sliding plate,
A base plate which has a sliding surface on the upper side larger than the sliding surface of the sliding plate and supports the sliding plate; and extends on a lower surface of the base plate in a width direction and a lower direction perpendicular to the longitudinal direction of the boiler; A support structure having a plurality of reinforcing plates fixed at intervals in the longitudinal direction of the boiler and disposed in the support space;
A wedge mechanism that is arranged between the lower surface of the support structure and the bottom surface of the support space and can adjust the inclination of the support structure;
A boiler is mounted on the ceiling back stay of the portal frame in which the wedge mechanism and the support structure are disposed inside the support space, and the sliding plate of the side back stay is placed on the reinforcing plate of the support structure. In the state where the inclination of the support structure is adjusted by the wedge mechanism so that the inclination of the base plate coincides with the sliding plate inclined by the side back stay being bent by hanging the side back stay, the support space and the A concrete solidified body formed by placing concrete between the reinforcing plates of the support structure;
A slide foundation structure for a waste heat recovery boiler support device.   2. The stopper according to claim 1, wherein a stopper that restricts the sliding plate from moving in the width direction is provided at an end of the sliding surface on the upper side of the base plate in the width direction orthogonal to the longitudinal direction of the boiler. The slide foundation structure of the described exhaust heat recovery boiler support device.   The slide base of the exhaust heat recovery boiler support device according to claim 1 or 2, wherein a shear key that extends in a longitudinal direction of the boiler and projects downward from the reinforcing plate is provided on a lower surface of the base plate. Construction.   The slide foundation structure for an exhaust heat recovery boiler support device according to claim 3, wherein a concave portion capable of accommodating the shear key is provided at a bottom portion of a support space provided in the foundation. A horizontal exhaust heat recovery boiler that guides gas in the lateral direction has a ceiling back stay and side back stays that support both ends of the ceiling back stay at a plurality of locations in the longitudinal direction, and the weight of the boiler is suspended by the ceiling back stay. An exhaust heat recovery boiler in which a gate-type frame that is supported by being lowered is arranged, and a lower end of the side back stay of the gate-type frame is slidably supported on the foundation so as to allow thermal expansion and contraction in the longitudinal direction of the boiler A method for constructing a slide foundation structure of a support device,
A wedge mechanism is placed in the support space provided on the foundation,
A support structure having a reinforcing plate on the lower surface of the base plate is placed on the wedge mechanism.
On the base plate of the support structure, the gate frame is installed by placing a sliding plate provided at the lower end of the side back stay of the gate frame.
Suspend and support the boiler on the ceiling backstay of the portal frame,
Adjusting the inclination of the support structure by operating the wedge mechanism so that the sliding surface of the base plate matches the sliding surface of the sliding plate;
Subsequently, a concrete foundation is formed by placing concrete between the inside of the support space and between the reinforcing plates of the support structure to form a solidified solid body.

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