KR20200069534A - Module Erection Method For Inner Flue Chimney - Google Patents

Abstract

The present invention relates to a method for modularizing a chimney structure in a chimney of a power station, which is constructed by modularizing a series of processes of supplying a half can after semi-assembling the same in a can block shape at the outside of the chimney instead of an existing method of assembling the same in the chimney one by one, lifting the supplied can block by using a lifting device, and repeatedly assembling the new can block on a lower end portion one by one by inserting the same thereinto, thereby shortening a construction period, minimizing danger caused by a high place work, and reducing manpower, equipment, time and costs required in construction at a single stroke.

Description

Modular Erection Method For Inner Flue Chimney}

The present invention relates to a modular construction method of a communication structure inside a chimney, and more specifically, a method in which half cans are assembled in an existing chimney in a can block form after being semi-assembled in a can block form, and then supplied. The invention relates to a modular construction method of an internal structure of a stack so that an efficient construction can be performed by modularizing a series of processes of repeatedly assembling by pulling up a new can block one by one using a lifting device.

1 is a general coal-fired power generation system diagram, as shown in the figure, a chimney in a power plant is an important structure for safely discharging exhaust gas generated in the process of generating fuel during the life of the power plant.

However, the stack is high in height and is exposed to severe corrosion environment conditions due to severe combustion gas, and thus is recognized as a vulnerable structure.

In particular, since the combustion gas generated by the solid coal fuel has a large amount of sulfur, unlike the liquefied natural gas, the combustion gas generated during combustion causes a corrosive environment in surrounding structures, thereby reducing the durability and stability of the structure.

2 is a schematic view showing the internal structure of a typical chimney.

As shown in Figure 2, the chimney 10 is an external chimney (11, Chimney); It is composed of; an inner structure (12, Inner Flue) provided inside the outer stack.

In the above, the internal structure 12 that induces the actual exhaust gas operates in a vulnerable environment of corrosion by discharging exhaust gas mixed with sulfur oxides, nitric oxide, and dust (ASH) around the internal temperature of 90~150℃ during normal operation of the power plant. It is becoming a situation.

In order to resist such corrosion characteristics, a titanium alloy clad plate method is currently used in domestic power plants. The titanium alloy cover plate method is a method of bonding a titanium alloy to a factory-made semi-circular steel can with a special electric resistance welding and re-welding the titanium can in the field.

The inner structure of the stack by the titanium alloy cover plate method described above forms a whole round can by welding a pair of semi-circular cans, and then forms a stack inside structure by forming a circular can in the same way.

However, in order to form the internal communication structure of the stack using the above method, a scaffold capable of moving the worker must be installed between the external stack and the internal stack, and it takes a lot of time and manpower to continuously weld the semi-circle can in a narrow space. There was a problem.

In addition, there has been a problem that a worker's safety accidents frequently occur due to the aerial work.

Republic of Korea Registered Patent No. 10-1478006

The present invention has been devised to solve the above-mentioned problems, the purpose of which is to supply a half-assembled method of assembling half cans in an existing stack in the form of a can block outside the stack and lifting the supplied can block. It is to provide a modular construction method of a stack structure inside to raise the structure using a device and modularize a series of processes to repeatedly assemble a new can block one by one at the lower end.

According to an aspect of the present invention for achieving the above object, a first step of manufacturing a half can: a second step of assembling a circular can to be welded in a circular manner with a half can and a half can; 3 steps of assembling a can block to be welded by placing a circular can and a circular can in a vertical direction; A fourth step of mounting the can block on a transport cart; A fifth step of transferring the can block mounted on the transfer cart into the inside of a stack; A sixth step of connecting the can block with a jacking wire of a lifting device installed on the top of a stack to raise it to be separated from a transport cart; 7 steps of mounting the lifting lug by returning the transfer cart; 8 steps of transferring the lifting lugs mounted on the transfer cart into the inside of the stack; A nine step of lowering the can block and placing them on the inner diameter of the lifting lug to engage with each other; 10 steps of connecting the lifting wire of the lifting device with a lifting lug and pulling it together with the can block to separate it from the transport cart; 11 steps of mounting the can block produced through the first process and the third process by returning the transport cart; 12 steps of transferring the can block mounted on the transfer cart into the inside of a stack; 13 steps of welding and assembling the transferred can block to the upper end and the raised can block; 14 steps to raise the assembled can block assembly together with a lifting lug through a lifting wire of a lifting device so as to be separated from a transport cart; And 15 steps of repeating steps 11 and 14 to extend the can block to the upper part of the stack, thereby providing a modular construction method of the stack structure.

The present invention as described above is a method of assembling the half can in the existing stack one by one in the form of a can block outside the stack and then supplying it, and raise the supplied can block using a lifting device and a new can block at the lower end. It is possible to shorten the construction period by modularizing and constructing a series of processes to repeatedly assemble them one by one, while minimizing the risks associated with aerial work while simultaneously reducing the manpower, equipment, time, and cost required for construction. Have

1 is a general coal-fired power generation system diagram.
Figure 2 is a schematic diagram showing the internal structure of a typical chimney.
Figure 3 is a flow chart for explaining the modular construction method of the internal structure of the stack according to the present invention.
Figure 4 is a field photo for explaining the half-can bending process according to the present invention.
Figures 5a to 5d is a field picture for explaining the manufacturing process of the circular can according to the present invention.
6A to 6D are on-site photographs for explaining a can block manufacturing process according to the present invention.
7 is a field photograph showing a process in which a can block is mounted on a transport cart of the present invention and transported into a stack.
Figure 8 is a scene picture showing the process of separating the can block of the present invention from the transport cart.
Figure 9 is a field photograph showing a process of transferring the inside of the stack by installing a lifting lug on the transport cart of the present invention.
Figure 10 is a scene picture showing the process of assembling the lifting lugs and can blocks of the present invention.
11 is a conceptual diagram for explaining the lifting device of the present invention.
12A and 12B are on-site photographs showing an example in which a work table for assembling a structure is installed inside and outside the can block of the present invention.
Figure 13 is a scene picture showing the process of assembling the can block of the present invention up and down.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Figure 3 is a flow chart illustrating a modular construction method of the internal structure of the stack according to the present invention.

Referring to Figure 3, the construction procedure of the inner stack structure according to the present invention is largely made in the order of half can production -> circular can production -> can block assembly -> can block transfer -> stack interior can block assembly.

Hereinafter, detailed features of each process will be described.

First, one step of manufacturing the half can 110 will be described. For the half-can 110 manufacturing process, the processed plate is pre-processed.

At this time, the pre-treatment operation may be performed by a shot blasting process in which iron particles are sprayed onto the surface of the processed plate with compressed air and cleaned, and a shearing process of cutting the processed plate into prescribed dimensions. .

Subsequently, each pre-processed work plate is welded and assembled into a half can 110 size, and the welded area is inspected through a non-destructive test.

The processed plate that has passed the non-destructive inspection is completed in the form of a half can 110 by bending in the form of a semi-circular cylinder through a bending device as shown in FIG. 4.

At this time, the half can 110 is manufactured in the form of a titanium material coated on the inner surface of the carbon steel material. This is to have the mechanical stiffness required in the internal structure of the stack and at the same time to have the durability to prevent corrosion against toxic gases.

Next, two steps of assembling the circular can 120, which is welded in a circular manner by the half can 110 and the half can 110, will be described with reference to FIGS. 5A to 5D.

5A to 5D are on-site photographs for explaining the manufacturing process of a circular can according to the present invention.

For the assembly process of the circular can 120, a work table 220 for manufacturing a circular can as shown in FIG. 5A is provided.

Referring to FIG. 5A, a separate circular can manufacturing work table 220 is provided in the field for manufacturing a circular can, wherein the plurality of devices 221 are arranged in the circumferential direction of the floor. do.

A pair of half cans 110 are set facing the inside of the device 221, and the device 221 supports the lower end of the half can 110 so that the half can 110 does not open and the circular state is maintained.

The device 221 prevents the half can 110 from moving during the operation, thereby improving the stability and quality of the welding operation.

Referring to FIG. 5B, the pair of half cans 110 facing each other is fixed by installing a plurality of fitting members 255 on the end face of the longitudinal joint.

At this time, the fitting member 255 is shown through FIG. 5C. Referring to FIG. 5C, the fitting member 255 prevents the half cans 110 from interleaving and the welding proceeds in a state in which the joints of the seams are correctly aligned. In order to install the fitting member 255, seams are used. As a guide, the locking protrusions 255a are contacted to the outer surfaces of both half cans. Then, both ends of the fitting member 255 are fastened to the locking projections 255a to be fixed.

At this time, the spacing between both ends of the half can 110 is adjusted by fitting the wedge member 255b between the ping member 255 and the locking protrusion 255a, and the wedge member is provided between the fitting member 255 and the half can 110. Insert to adjust the vertical alignment of both ends of the half can 110.

Referring to FIG. 5D, after performing the fitting operation using the fitting member 255, the inner and outer surfaces are welded, and the half can 110 is inspected for defects by performing a non-destructive inspection on the inner and outer surfaces.

When the circular can is completed through the above-described working process, the circular can 120 and the circular can 120 are placed up and down to weld each other to perform three steps of assembling one can block 130.

The three processes will be described with reference to FIGS. 6A to 6D.

6A to 6E are on-site photographs for explaining the can block manufacturing process according to the present invention.

6A, a work table 230 for manufacturing can blocks dedicated to can block 130 is disclosed. The can block manufacturing work table 230 is manufactured in a pagoda shape, and forms a donut-shaped can guide hole 233 in the center of the second floor 231.

6B, a circular can 120 is inserted through the can guide hole 233, and another circular can 120 is mounted on the circular can 120 to be set in a line.

At this time, as shown in Figure 6c, a worker movement passage 237 is formed in the center of the inner bottom of the can guide hole 233, and a work scaffold capable of welding or the like is provided around the work passage 257.

And, as shown in Figure 6d, the cross section of the transverse joint between the circular can 120 and the circular can 120 is coincident, so that the fitting operation using the fitting member 255 is performed.

Thereafter, the welding operation is performed in the outer and inner circumferential directions of the circular can 120 around the can guide hole 233, respectively.

Next, four steps of mounting the can block 130 on the transport cart 150 will be described with reference to FIG. 7.

7 is a field photograph showing a process in which a can block is mounted on a transport cart of the present invention and transported into a stack. Referring to FIG. 7, a transport cart 150 for transporting the can block 130 into a stack is disclosed.

The transport truck 150 is allowed to move along the rail, and for this purpose, a track 151 is installed at the construction site outside the stack. At this time, the track 151 is extended to the work block 230 for the can block production, and after the can block 130 is manufactured, it is mounted on a transport cart using a crane to allow movement.

The can block 130 mounted on the transport cart 150 is transported into the stack 1 along the rail 151 and transported into the stack. (5 processes)

At this time, the track 151 for driving the transport cart 150 is formed of a main line connected to the inside of the stack 1 and an auxiliary line extending from the main line and connected to a work block for can block production. A variable line for turning may be formed at a point where the line meets the auxiliary line.

8 is a field photograph showing a process of separating a can block of the present invention from a transport cart. Referring to FIG. 8, the can block 130 is a jacking wire 165 of the lifting device installed on the top of the stack 1 Connected with and raise to separate from the transport cart 150. (6 steps)

FIG. 9 is a field photograph showing a process of mounting a lifting lug on a transport cart of the present invention and transporting it into a stack, referring to FIG. 9, after moving the transport cart 150 outside the stack, lifting lug 140 Mount it so that it is transported back into the inside of the chimney. (7 processes) (8 processes)

The lifting lug 140 is a rim-shaped structure, and is coupled to surround the outer periphery of the can block 130 when the can block 130 previously impressed inside the stack is lowered. The lifting lug 140 combined with the can block 130 stably raises a plurality of can blocks 130 that are subsequently assembled by connecting with the jacking wire 165 of the lifting device 160 installed on the top of the stack 1 Is ordered.

For example, whenever another can block 130 is additionally connected one by one to the lower portion of the can block 130, the load also continuously increases, and a coupling means capable of stably supporting and raising the load of the entire can block assembly is provided. It is to provide.

The lifting lug 140 having the above-described purpose is mounted on the transport cart 150 and then transferred into the stack 1.

10 is a field photograph showing a process of assembling and lifting the lifting lug and the can block of the present invention. Referring to FIG. 10, when the lifting lug 140 is located under the can block 130 in the stack, the can block 130 is lowered to be positioned at the inner diameter of the lifting lug 140, and the lifting lug (140) is mounted on the can block 130 to be integrated. (9 processes)

When the mounting of the lifting lug 140 is completed, the jacking wire 165 of the lifting device 160 provided on the top of the stack is connected to the lifting lug 140, and then the jacking wire 165 is pulled up to transport the vehicle 150 ) Lifting the lug 140 and the can block 130 to separate the assembly is performed. (10 processes)

11 is a conceptual diagram for explaining the lifting device of the present invention. Referring to FIG. 11, the present invention is to use a strand jack (Strand Jack) method, a heavy girder (Heavy Girder) instead of a super-large crane to work on the top The jack 163 is used.

Compared to the existing method, it is not suitable for sites with short air and a narrow site because the long period of assembly of the crane and the site for assembly and disassembly are required separately. Since the strand jack method generates a hydraulic pressure by means of a pump to raise a heavy object, a short preparation period and short space are possible.

To briefly describe the operating principle of the strand jack 163, the jacking wire 165 is installed through the strand jack 163 in the vertical direction, the top and bottom of the strand jack 163, respectively, the jacking wire ( 165) is provided with a locking means (169) for individually chucking.

In addition, the strand jack 163 is connected to the hydraulic cylinder to repeat the ascending and descending operation. In the lifting operation of the strand jack 163, the upper locking means 169 fixes the jacking wire 165 and the lower locking means. (169) by unlocking the jacking wire (165), so that the jacking wire (165) along with the strand jack (163) is raised, when the lowering operation of the strand jack (163) lower locking means (169) is jacking The wire 165 is fixed to prevent the jacking wire 165 from flowing down, and the upper locking means 169 releases the locking state of the jacking wire 165 to descend together with the strand jack 163 and then move upward. To prepare.

The lifting device 160 is installed to install the platform 161 on the top of the stack (1), a plurality of strand jacks 163 based on the platform 161 is installed to be distributed in the circumferential direction of the stack, the strand The jack 163 repeats the lifting operation by the hydraulic cylinder 167 to transfer the jacking wire 165 connected to the jacking lug 140 in the vertical direction, the can block 130 coupled to the jacking lug 140 Let this be raised together.

Thereafter, the transport cart 150 is returned to mount the can block 130 manufactured through the first process and the third process. (11 processes)

At this time, the inside and outside the can block 130 of the transport truck 150 is mounted for assembling a structure for assembling the can block 130 and the can block 130 located in the upper and lower straight lines in the stack 1 The work table 250 is installed and transported together (12 processes).

12A and 12B are field photographs showing an example in which a work table for assembling a structure is installed inside and outside the can block of the present invention, and the work table 250 for assembling the structure can be installed using a scaffolding assembly scaffold, which is a hypothesis of the work table. And to facilitate dismantling.

Subsequently, welding assembly is performed by butting the upper end of the transported can block 130 and the lower end of the raised can block 130. (Step 13)

13 is a field photograph showing a process in which the can block of the present invention is vertically assembled, and another can block 130 is mounted on the lifting device 160 on the can block 130 and is set in line.

Thereafter, after performing a fitting operation so that the cross-sections of the joints do not coincide and spread, a welding operation is performed on the outer and inner surfaces of the can block 130, respectively.

The fitting operation is performed in a similar manner to the fitting operation of the circular can 120, and after the welding operation, a grinding operation and a non-destructive inspection of the welding surface are performed.

All processes of the present invention are to perform a grinding operation and a non-destructive inspection operation after welding.

Figure 14 is a scene picture showing a process for lifting the lifting device can block assembly of the present invention. Referring to FIG. 14, the assembled can block 130 assembly is pulled together with the lifting lug 140 through the lifting wire 165 of the lifting device 160 so as to be separated from the transport cart 150. (14 fair)

Thereafter, the transport cart 150 is moved out of the stack to repeat the above steps 11 and 14 to assemble and install the can blocks 130 up to the top of the stack.

In addition, after the 15th step, the outside of the can block 130 is wrapped with a heat insulating material so that a heat insulating operation is performed.

The above-described present invention is a method of manually assembling the half can in the existing stack, after semi-assembled in the form of can blocks from the outside of the stack, and then supplying the supplied can blocks using a lifting device, and raising new can blocks one by one at the bottom. By modularizing and constructing a series of repetitively assembling processes, the construction period can be significantly shortened, and the risk of high-altitude work is minimized while reducing the manpower, equipment, time, and cost required for construction. .

As described above, the present invention is not limited to the specific preferred embodiments described above, and various modifications can be made by anyone having ordinary skill in the art to which the present invention pertains without departing from the gist of the present invention as claimed in the claims. Needless to say, such modifications are within the scope of the claims.

1: chimney 110: half can
120: round can 130: can block
140: lifting lug 150: transfer cart
160: lifting device 161: platform
163: Strand Jack 165: Jacking Wire
167: hydraulic cylinder 169: locking means
220: workbench for making circular cans 221: device
223: fitting member 230: can block manufacturing work table
231: 2nd floor 233: Can guide hole
237: worker movement path 250: workbench for assembling the structure
251: footrest part 255: fitting member
255a: engaging projection 255b: wedge member
257: working path

Claims (7)

Step 1 of manufacturing the half can 110:
A two step of assembling the half can 110 and the half can 110 to assemble a circular can 120 which is welded in a circle;
3 steps of assembling the can block 130 for welding by arranging the circular can 120 and the circular can 120 in the vertical direction;
Four steps for mounting the can block 130 on the transport cart 150;
A fifth step of transferring the can block 130 mounted on the transfer cart 150 into the stack 1;
6 steps of connecting the can block 130 with the jacking wire 165 of the lifting device 160 installed on the top of the chimney 1 to raise it to be separated from the transport cart 150;
7 steps of mounting the lifting lug 140 by returning the transfer cart 150;
8 steps of transferring the lifting lug 140 mounted on the transfer cart 150 into the stack 1;
9 steps of lowering the can block 130 and positioning them on the inner diameter of the lifting lug 140 to mutually couple them;
10 steps of connecting the lifting wire 165 of the lifting device 160 with the lifting lug 140 and pulling it together with the can block 130 so as to be separated from the transport cart 150;
11 steps of mounting the can block 130 produced through the first process and the third process by returning the transport cart 150;
12 steps of transferring the can block 130 mounted on the transfer cart 150 into the stack 1;
13 steps of welding and assembling the upper end of the transferred can block 130 against the lower end of the raised can block 130;
14 steps to raise the assembled can block 130 assembly with the lifting lug 140 through the lifting wire 165 of the lifting device 160 to be separated from the transport cart 150; And
15 steps of repeating the 11th and 14th steps so that the can block 130 is extended to the upper part of the stack; a modular construction method of the stack structure of the stack. According to claim 1,
After the 15th step, a modular construction method of the internal structure of the stack is characterized by further performing 16 steps of lifting the can block 130 from the 2nd floor of the stack with a heat insulating material. According to any one of claims 1 or 2,
In the second step, a workbench 220 for manufacturing a circular can is provided, but a plurality of devices 221 are arranged in a circumferential direction of the workbench 220 for manufacturing a circular can, and supported by the device 221. Set inside facing a pair of half cans 110 to maintain, and after performing the fitting operation using the fitting member 255 so that the longitudinal joint cross-section does not open, the inner and outer surfaces of the stack are characterized in that the welding operation proceeds. Modular construction method of structure. According to any one of claims 1 or 2,
In the third step, a can block manufacturing work table 230 is provided, but the can block manufacturing work table 230 forms a pagoda-shaped two-layer floor 231, and in the center of the two-layer floor 231, Modular construction method of the inner structure of the chimney, characterized in that to form a donut-shaped can guide hole 233 through which the circular can 120 is inserted. According to any one of claims 1 or 2,
The transport truck 150 is provided with a work block 250 for assembling a structure for assembling the can block 130 and the can block 130 within the stack 1, but the work table 250 for assembling the structure The modular construction method of the internal structure of the chimney, characterized in that to form a pagora-shaped scaffolding (251). According to any one of claims 1 or 2,
The lifting device 160 is a modular construction method of the inner structure of the chimney, characterized in that using a strand jack method. According to any one of claims 1 or 2,
Modular construction method of the internal structure of the stack, characterized in that the track 151 for driving the transport truck 150 is installed in a stack (1) outside the construction site.

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