Method for making large condenser water chamber

Abstract

A method for making a large condenser water chamber includes the following steps: 1. Making a square flange at the bottom of the water chamber, and welding and reinforcing the inside of the square flange; 2. Making a water chamber pipe flange: making two pipes respectively, and when cutting the pipes, reserving a linear integral cutting, and using a reinforced connection between the two pipes to form an integral pipe flange, ensuring that the flange surfaces of the two pipes are at the same level; 3. Making a water chamber shell; 4. On-site installation: opening a hole at the connection position between the pipe flange and the water chamber shell, and trimming the pipe flange on-site for installation. The present invention can well meet the overall dimensional accuracy requirements of the product, and is the fastest, optimizing labor to improve overall work efficiency, and creating higher economic benefits.

Description

Technical Field

[0001] The invention relates to the technical field of condenser circulating water inlet and outlet water chambers, in particular to a method for manufacturing a large condenser water chamber. Background Art

[0002] The condenser is a heat exchange device that condenses the exhaust steam of the steam turbine into water. It is mainly used in steam turbine power plants. The exhaust steam of the steam turbine enters the shell through the throat, condenses into water on the cooling tube bundle and collects in the hot well, and is pumped out by the condensate pump. The water chamber is the inlet and outlet circulation channel of the condenser cooling water. The cooling water (also called circulating water) enters the cooling tube bundle from the inlet water chamber and is discharged from the outlet water chamber. In order to ensure that a high vacuum and good heat transfer effect are maintained in the condenser during steam condensation, it is also equipped with an exhaust device to continuously extract the air and other non-condensable gases that leak into the condenser.

[0003] In this project, the condenser water chamber is a large structural component with a bottom connecting frame flange of 6 meters * 4 meters. The diameter of the semi-cylinder and the upper connecting pipe diameter are both more than 2 meters, and the upper connecting flange is nearly 3 meters.

[0004] The above-mentioned extra-long dimensions and the unique internal hollow structure of the water chamber bring the following problems in actual production:

[0005] 1. The bottom flange is 110mm thick, while the shell parts are thin plates with a hollow internal structure, which is prone to structural deformation.

[0006] 2. Both the bottom flange and the upper connecting flange need to be processed as a whole after welding. Pay attention to the flatness before processing the upper connecting flange.

[0007] 3. The size of the water chamber is too large, there are many cold-processed parts, and the position of the upper connecting pipe needs to be opened on site to ensure assembly accuracy. Summary of the invention

[0008] The purpose of the present invention is to overcome the deficiencies in the above-mentioned prior art and to propose a method for manufacturing a condenser water chamber. By utilizing a reinforced setting and making multiple parts into small components first, the welding sequence and position are optimized, the dimensional accuracy and quality of the product are ensured, while the work efficiency is improved, the production cycle is shortened, and greater economic benefits are created.

[0009] The present invention is achieved through the following technical solutions:

[0010] A method for manufacturing a large condenser water chamber, characterized in that the method comprises the following steps:

[0011] Step 1: Make a square flange at the bottom of the water chamber and weld and reinforce it inside the square flange:

[0012] Reinforced round steel is welded into a square frame with a length and width of 6*4m and a thickness of 110mm, and reinforced round steel is welded into an M shape in the flange of the square frame for reinforcement;

[0013] Step 2: Make the water chamber connecting flange:

[0014] Two pipes are made separately, and when cutting the pipes, linear cutting is reserved. A reinforced connection is used between the two pipes to form an integral pipe flange, ensuring that the flange surfaces of the two pipes are at the same level;

[0015] Step 3: Make the water chamber shell:

[0016] Based on the square frame flange, the water chamber shell is installed, and reinforcement is used inside the water chamber shell;

[0017] Step 4: On-site installation:

[0018] A hole is opened at the connection position between the connecting flange and the water chamber shell, and the connecting flange is trimmed on site for installation.

[0019] The water chamber shell has a hollow structure inside and is a thin plate; when it is welded with the square frame flange, matching welding and symmetrical welding are adopted, the heat input is symmetrical, and the position is changed reasonably.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] With the condenser water chamber of the present invention, the extra-thick square flange at the bottom and the two connecting pipe flanges at the top need to be welded and then machined as a whole, and the plane holes are drilled. The two connecting pipe flanges at the top have a minimum plate thickness requirement, and they must be ensured to be in the same plane as much as possible during assembly. Due to the internal hollow structure, special attention must be paid to controlling welding deformation during assembly and welding to prevent dimensional deviations. Therefore, they are manufactured in parts to ensure the size while reducing labor and improving efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Schematic diagram of the square frame flange components at the bottom of the water chamber.

[0023] Figure 2 Schematic diagram of water chamber connecting pipe components.

[0024] Figure 3 Schematic diagram of the shell installation opening and pipe hole.

[0025] Figure 4 Schematic diagram of pipe flange installation. DETAILED DESCRIPTION

[0026] The present invention will be further described below in conjunction with the accompanying drawings and embodiments, but the protection scope of the present invention shall not be limited thereto.

[0027] In this embodiment, the method for making a large condenser water chamber is made by sub-components, and the specific steps are as follows:

[0028] Step 1: Make the square flange at the bottom of the water chamber, see Figure 1

[0029] The condenser water chamber is a semi-cylindrical structure with a hollow interior. The bottom square frame flange is the connecting flange between the water chamber and the condenser shell. Therefore, the bottom square frame flange is first made into a component, and then the remaining parts are assembled based on it.

[0030] At the same time, since the thickness of the square flange reaches 110mm, and the water chamber shell parts are thin plates and the interior is a completely hollow structure, deformation is very easy to occur during welding. In order to ensure the overall structural size of the water chamber, from the perspective of steel plate utilization, long strip cutting and welding are the best. There is no other structure inside. Reinforced round steel must be used during welding to prevent welding deformation, and M-type reinforcement is set.

[0031] Step 2: Make the pipe parts, see Figure 2 ;

[0032] In order to ensure that the flange surfaces of the two pipes are at the same level, after the single pipe component is manufactured, a reinforced connection is used between the two branch pipes to make the two pipes form an integral component, and then assembled and welded with the water chamber shell, which can greatly ensure the accuracy of subsequent flange surface installation;

[0033] Step 3: Use the bottom plate frame flange as a reference to weld the shell and other parts. Figure 3

[0034] With the bottom square frame flange as the reference, the shell parts are installed. At the same time, the internal structure is strengthened to ensure the hollow structure and prevent welding deformation caused by the welding process. After the shell parts and other small parts are welded, the pipe parts are installed. The connection position between the pipe and the shell is opened, and the holes are marked on site. The two pipe parts are welded into one component, laying the foundation for the subsequent flange installation.

[0035] Step 4: Install the flange on site to ensure the flange flatness. Figure 4

[0036] Since the condenser water chamber is a semi-cylindrical structure with a hollow interior, the shell thickness is only 20mm, and it is very easy to shrink and deform when welded to the extra-thick bottom plate frame flange. The interior of the semi-cylindrical shell needs to be welded in multiple places to prevent deformation. At the same time, matching welding and symmetrical welding are performed with symmetrical welding heat input. The position is also changed reasonably many times during the welding process to prevent deformation of the structural parts.

[0037] With the condenser water chamber of the present invention, the extra-thick square flange at the bottom and the two connecting pipe flanges at the top need to be welded and then machined as a whole, and the plane holes are drilled. The two connecting pipe flanges at the top have a minimum plate thickness requirement, and they must be ensured to be in the same plane as much as possible during assembly. Due to the internal hollow structure, special attention must be paid to controlling welding deformation during assembly and welding to prevent dimensional deviations. Therefore, they are manufactured in parts to ensure the size while reducing labor and improving efficiency.

Claims

1. A method for manufacturing a large condenser water chamber, characterized in that: The method comprises the following steps: Step 1: Make a square flange at the bottom of the water chamber and weld and reinforce it inside the square flange: Reinforced round steel is welded into a square frame with a length and width of 6*4m and a thickness of 110mm, and reinforced round steel is welded into an M shape in the flange of the square frame for reinforcement; Step 2: Make the water chamber connecting flange: Two pipes are made separately, and when cutting the pipes, a linear overall cutting is reserved. A reinforced connection is used between the two pipes to form an overall pipe flange, ensuring that the flange surfaces of the two pipes are at the same level; Step 3: Make the water chamber shell: Based on the square frame flange, the water chamber shell is installed, and reinforcement is used inside the water chamber shell; Step 4: On-site installation: A hole is opened at the connection position between the connecting flange and the water chamber shell, and the connecting flange is trimmed on site for installation.

2. The method for manufacturing a large condenser water chamber according to claim 1, characterized in that: The water chamber shell has a hollow structure inside and is a thin plate; when it is welded with the square frame flange, matching welding and symmetrical welding are adopted, the heat input is symmetrical, and the position is changed reasonably.

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