JPS597804A - Method of assembling steam generator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for assembling a steam generator, and more particularly to a method suitable for assembling a waste heat boiler for recovering heat from gas turbine exhaust gas.

With recent changes in the fuel situation, higher power generation efficiency is required in thermal power plants, and one way to achieve this is to construct combined cycle power plants that combine gas turbines and steam turbines. ing. A combined power generation plant first generates electricity using a gas turbine, then recovers the heat in the waste gas discharged from the gas turbine in a waste heat recovery boiler, and uses the steam generated in the boiler to drive a steam turbine to generate electricity. It is. In this case, the heat recovery efficiency of the waste heat recovery boiler has a large effect on the power generation efficiency of the combined cycle power plant, so there is a tendency for the waste heat recovery boiler to become larger in order to improve efficiency, and recently, the height and width of the waste heat recovery boiler are about 10 m. , it is a large one with a length of 20 to 30 m. For this reason, a large amount of labor is required to transport and install the boiler, and an improvement is desired, and one method for improving this problem is to block the boiler. In this method, the boiler is divided and formed, for example, into groups of heat transfer tubes, in a factory, and the blocks are transported to the site and assembled as one body there. To give an example of a conventional transportation method, each block produced at a factory is loaded onto a ship using a floating crane, etc., transported to a port near the destination, unloaded again using a floating crane, and transported to the destination using a heavy goods transport vehicle. transported to. Next, installation and assembly will be carried out on-site using a gantry crane or crawler crane. As described above, in the conventional method, complicated operations have to be carried out using various devices to transport and assemble blocks, and the advantages of forming blocks have not always been demonstrated.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method that eliminates the above-mentioned problems and allows easy and reliable transportation, installation, and assembly of a steam generator such as a waste heat boiler.

In short, this invention loads the blocks that make up the steam generator for an automatic driving vehicle that can move up and down the floor, lowers and fixes them one after another on a foundation frame whose upper surface is higher than the floor, and connects each block. This is a method of assembling a steam generator by:

Embodiments of the present invention will be described below based on the drawings.

Figures 1 and 2 show the structure of a waste heat recovery boiler. The entire boiler is formed into a duct shape to allow exhaust gas G to pass through, and is a large boiler with a height and two widths of approximately 10 m. This waste heat boiler is formed in advance by dividing it into blocks (unit components), and by connecting these blocks, it is constructed as an integrated waste heat boiler. ■ in the figure is a superheater block that has a superheater 1, and its length (indicated by the symbol in the figure) is approximately 4 J 5 m,
IN:J A denitrification block having a denitrification device, the length of which is, for example, about 4.1 m. Furthermore, ■ is a high-pressure evaporator 3. High pressure economizer 4. Boiler drum5. This is a high-pressure boiler main block with downcomer pipes 6, etc., and its length is approximately 6.9 m, f
sl is a low pressure evaporator7. Low pressure energy saver8. Boiler drum9.
This is a low-pressure boiler main block having a downcomer pipe 10, and its length is approximately 6.1 m. The waste heat recovery boiler formed by arranging each of the blocks described above is a large one with a total length of about 22 m.

Next, the assembly of the boiler having the above configuration will be explained in detail. In Figures 3 to 6, 11 and 12 are automated vehicles for transporting heavy objects called dollies, which can also move outward in front and rear directions, and are arranged in a two-metal row as shown in Figure 3. Then, the boiler construction blocks are placed on each dolly and transported to the assembly site. At the assembly site, a foundation frame 14 made of a strong material such as pre-warmed concrete is provided. Arrangement interval L of foundation frame 14
1+I+2 is do IJ -11,12 as shown in Figure 3.
Let the interval be such that it can pass through.

Doe IJ- arrived at the scene loaded with superheater block■
11 and 12 move backward between the foundation pedestal 14 and reach the pedestal on which the block is to be installed. In this case, the height of the floor of the dolly is raised by means such as hydraulic pressure, and as shown in FIG. The dolly is configured to be higher than the height h2 to enable the dolly to move backward.

In this way, the superheater block ■ is shown in Figure 6.
The floor of IJ- is lowered from the lla position to the lla position, and the block is placed and fixed on the base frame 14. When the installation of block I is completed, dollies 11 and 12 are moved forward and the installation of the next block begins. The subsequent blocks are installed and installed using the same method, and this process is repeated thereafter to install and assemble the waste heat recovery boiler.

FIG. 7 shows details of how blocks are loaded onto the dolly. Reference numeral 16 denotes an intervening part such as an H-shaped steel placed on the floor 11a of the dolly, and the block I having the support member 15 is placed on this intervening part assembly.

This allows the support member 15 to protrude outside the floor of the dolly.
The block is installed by placing the end portion 15a of the block on the base frame 14.

In addition, in the above explanation, the case where two dollies are arranged in parallel was explained as an example, but it is not limited to this, and depending on the arrangement of the foundation frame, one dolly can be used. It is also possible to install a boiler.

By carrying out this invention, steam generation equipment such as waste heat recovery boilers can be transported and assembled using automatic vehicles such as dollies, and there is no need to use special equipment such as gantry cranes or crawler cranes. Since there are no scratches, the work can be done easily and reliably.

[Brief explanation of the drawing]

Figure 1 is a sectional view showing the side of the waste heat recovery boiler, Figure 2 is a plan view of the waste heat recovery boiler shown in Figure 1, and Figure 3 is a plan view of the block and the dolly showing how the block is installed on the dolly. Figures 4 and 5 are side views of the dolly showing how the block is installed by the dolly, and Figure 6 is a side view of the dolly showing the block installed by the dolly.
and FIG. 7 is a partial perspective view of the dolly and block. 11.12...Dolly 1]-a...Dolly floor 14...Foundation frame

Claims (1)

[Scope of Claims] 1. In a method for assembling a steam generator such as a waste heat recovery boiler, unit components obtained by dividing the steam generator are loaded onto an automatic driving vehicle that can move up and down the floor, and 1. A method of assembling a steam generator, which comprises sequentially lowering and fixing the unit components to a base frame whose upper surface is higher than the floor, and interconnecting unit components to form a steam generator. 2. The method of assembling a steam generator according to claim 1, wherein the automatic traveling vehicle is a dolly capable of moving forward and backward as well as moving laterally. 3. A method for assembling a steam generator according to claim 2, characterized in that two dollies are used in parallel.